774 lines
24 KiB
C
774 lines
24 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
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ChibiOS - Copyright (C) 2021 Stefan Kerkmann
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file USART/hal_uart_lld.c
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* @brief GD32 low level UART driver code.
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*
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* @addtogroup UART
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* @{
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*/
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#include "hal.h"
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#if HAL_USE_UART || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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#define USART0_RX_DMA_CHANNEL \
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GD32_DMA_GETCHANNEL(GD32_UART_USART0_RX_DMA_STREAM, \
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GD32_USART0_RX_DMA_CHN)
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#define USART0_TX_DMA_CHANNEL \
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GD32_DMA_GETCHANNEL(GD32_UART_USART0_TX_DMA_STREAM, \
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GD32_USART0_TX_DMA_CHN)
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#define USART1_RX_DMA_CHANNEL \
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GD32_DMA_GETCHANNEL(GD32_UART_USART1_RX_DMA_STREAM, \
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GD32_USART1_RX_DMA_CHN)
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#define USART1_TX_DMA_CHANNEL \
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GD32_DMA_GETCHANNEL(GD32_UART_USART1_TX_DMA_STREAM, \
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GD32_USART1_TX_DMA_CHN)
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#define USART2_RX_DMA_CHANNEL \
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GD32_DMA_GETCHANNEL(GD32_UART_USART2_RX_DMA_STREAM, \
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GD32_USART2_RX_DMA_CHN)
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#define USART2_TX_DMA_CHANNEL \
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GD32_DMA_GETCHANNEL(GD32_UART_USART2_TX_DMA_STREAM, \
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GD32_USART2_TX_DMA_CHN)
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#define UART3_RX_DMA_CHANNEL \
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GD32_DMA_GETCHANNEL(GD32_UART_UART3_RX_DMA_STREAM, \
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GD32_UART3_RX_DMA_CHN)
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#define UART3_TX_DMA_CHANNEL \
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GD32_DMA_GETCHANNEL(GD32_UART_UART3_TX_DMA_STREAM, \
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GD32_UART3_TX_DMA_CHN)
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#define UART4_RX_DMA_CHANNEL \
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GD32_DMA_GETCHANNEL(GD32_UART_UART4_RX_DMA_STREAM, \
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GD32_UART4_RX_DMA_CHN)
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#define UART4_TX_DMA_CHANNEL \
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GD32_DMA_GETCHANNEL(GD32_UART_UART4_TX_DMA_STREAM, \
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GD32_UART4_TX_DMA_CHN)
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#define GD32_UART34_CR2_CHECK_MASK \
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(USART_CTL1_STB_0 | USART_CTL1_CKEN | USART_CTL1_CPL | USART_CTL1_CPH | \
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USART_CTL1_CLEN)
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#define GD32_UART35_CR3_CHECK_MASK \
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(USART_CTL2_CTSIE | USART_CTL2_CTSEN | USART_CTL2_RTSEN | USART_CTL2_SCEN | \
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USART_CTL2_NKEN)
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/** @brief USART0 UART driver identifier.*/
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#if GD32_UART_USE_USART0 || defined(__DOXYGEN__)
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UARTDriver UARTD1;
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#endif
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/** @brief USART1 UART driver identifier.*/
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#if GD32_UART_USE_USART1 || defined(__DOXYGEN__)
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UARTDriver UARTD2;
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#endif
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/** @brief USART2 UART driver identifier.*/
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#if GD32_UART_USE_USART2 || defined(__DOXYGEN__)
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UARTDriver UARTD3;
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#endif
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/** @brief UART3 UART driver identifier.*/
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#if GD32_UART_USE_UART3 || defined(__DOXYGEN__)
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UARTDriver UARTD4;
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#endif
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/** @brief UART4 UART driver identifier.*/
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#if GD32_UART_USE_UART4 || defined(__DOXYGEN__)
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UARTDriver UARTD5;
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#endif
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/**
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* @brief Status bits translation.
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*
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* @param[in] stat USART STAT register value
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*
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* @return The error flags.
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*/
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static uartflags_t translate_errors(uint16_t stat) {
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uartflags_t sts = 0;
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if (stat & USART_STAT_ORERR)
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sts |= UART_OVERRUN_ERROR;
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if (stat & USART_STAT_PERR)
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sts |= UART_PARITY_ERROR;
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if (stat & USART_STAT_FERR)
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sts |= UART_FRAMING_ERROR;
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if (stat & USART_STAT_NERR)
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sts |= UART_NOISE_ERROR;
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if (stat & USART_STAT_LBDF)
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sts |= UART_BREAK_DETECTED;
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return sts;
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}
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/**
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* @brief Puts the receiver in the UART_RX_IDLE state.
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*
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* @param[in] uartp pointer to the @p UARTDriver object
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*/
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static void uart_enter_rx_idle_loop(UARTDriver *uartp) {
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uint32_t mode;
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/* RX DMA channel preparation, if the char callback is defined then the
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TCIE interrupt is enabled too.*/
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if (uartp->config->rxchar_cb == NULL)
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mode = GD32_DMA_CTL_DIR_P2M | GD32_DMA_CTL_CMEN;
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else
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mode = GD32_DMA_CTL_DIR_P2M | GD32_DMA_CTL_CMEN | GD32_DMA_CTL_FTFIE;
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dmaStreamSetMemory0(uartp->dmarx, &uartp->rxbuf);
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dmaStreamSetTransactionSize(uartp->dmarx, 1);
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dmaStreamSetMode(uartp->dmarx, uartp->dmarxmode | mode);
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dmaStreamEnable(uartp->dmarx);
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}
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/**
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* @brief USART de-initialization.
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* @details This function must be invoked with interrupts disabled.
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*
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* @param[in] uartp pointer to the @p UARTDriver object
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*/
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static void usart_stop(UARTDriver *uartp) {
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/* Stops RX and TX DMA channels.*/
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dmaStreamDisable(uartp->dmarx);
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dmaStreamDisable(uartp->dmatx);
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/* Stops USART operations.*/
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uartp->usart->CTL0 = 0;
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uartp->usart->CTL1 = 0;
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uartp->usart->CTL2 = 0;
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}
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/**
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* @brief USART initialization.
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* @details This function must be invoked with interrupts disabled.
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*
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* @param[in] uartp pointer to the @p UARTDriver object
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*/
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static void usart_start(UARTDriver *uartp) {
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uint32_t fck;
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uint16_t ctl0;
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USART_TypeDef *u = uartp->usart;
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/* Defensive programming, starting from a clean state.*/
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usart_stop(uartp);
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/* Baud rate setting.*/
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if (uartp->usart == USART0)
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fck = GD32_PCLK2 / uartp->config->speed;
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else
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fck = GD32_PCLK1 / uartp->config->speed;
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u->BAUD = fck;
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/* Resetting eventual pending status flags.*/
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(void)u->STAT; /* SR reset step 1.*/
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(void)u->DATA; /* SR reset step 2.*/
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u->STAT = 0;
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/* Note that some bits are enforced because required for correct driver
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operations.*/
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u->CTL1 = uartp->config->ctl1 | USART_CTL1_LBDIE;
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u->CTL2 = uartp->config->ctl2 | USART_CTL2_DENT | USART_CTL2_DENR |
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USART_CTL2_ERRIE;
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/* Mustn't ever set TCIE here - if done, it causes an immediate
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interrupt.*/
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ctl0 = USART_CTL0_UEN | USART_CTL0_PERRIE | USART_CTL0_TEN | USART_CTL0_REN;
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u->CTL0 = uartp->config->ctl0 | ctl0;
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/* Starting the receiver idle loop.*/
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uart_enter_rx_idle_loop(uartp);
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}
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/**
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* @brief RX DMA common service routine.
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*
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* @param[in] uartp pointer to the @p UARTDriver object
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* @param[in] flags pre-shifted content of the ISR register
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*/
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static void uart_lld_serve_rx_end_irq(UARTDriver *uartp, uint32_t flags) {
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/* DMA errors handling.*/
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#if defined(GD32_UART_DMA_ERROR_HOOK)
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if ((flags & (GD32_DMA_INTF_ERRIF)) != 0) {
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GD32_UART_DMA_ERROR_HOOK(uartp);
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}
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#else
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(void)flags;
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#endif
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if (uartp->rxstate == UART_RX_IDLE) {
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/* Receiver in idle state, a callback is generated, if enabled, for each
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received character and then the driver stays in the same state.*/
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_uart_rx_idle_code(uartp);
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}
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else {
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/* Receiver in active state, a callback is generated, if enabled, after
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a completed transfer.*/
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dmaStreamDisable(uartp->dmarx);
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_uart_rx_complete_isr_code(uartp);
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}
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}
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/**
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* @brief TX DMA common service routine.
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*
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* @param[in] uartp pointer to the @p UARTDriver object
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* @param[in] flags pre-shifted content of the ISR register
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*/
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static void uart_lld_serve_tx_end_irq(UARTDriver *uartp, uint32_t flags) {
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/* DMA errors handling.*/
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#if defined(GD32_UART_DMA_ERROR_HOOK)
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if ((flags & (GD32_DMA_INTF_ERRIF)) != 0) {
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GD32_UART_DMA_ERROR_HOOK(uartp);
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}
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#else
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(void)flags;
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#endif
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dmaStreamDisable(uartp->dmatx);
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/* A callback is generated, if enabled, after a completed transfer.*/
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_uart_tx1_isr_code(uartp);
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}
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/**
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* @brief USART common service routine.
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*
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* @param[in] uartp pointer to the @p UARTDriver object
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*/
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static void serve_usart_irq(UARTDriver *uartp) {
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uint16_t stat;
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USART_TypeDef *u = uartp->usart;
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uint32_t ctl0 = u->CTL0;
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stat = u->STAT; /* SR reset step 1.*/
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(void)u->DATA; /* SR reset step 2.*/
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if (stat & (USART_STAT_LBDF | USART_STAT_ORERR | USART_STAT_NERR |
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USART_STAT_FERR | USART_STAT_PERR)) {
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u->STAT = ~USART_STAT_LBDF;
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_uart_rx_error_isr_code(uartp, translate_errors(stat));
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}
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if ((stat & USART_STAT_TC) && (ctl0 & USART_CTL0_TCIE)) {
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/* TC interrupt cleared and disabled.*/
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u->STAT = ~USART_STAT_TC;
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u->CTL0 = ctl0 & ~USART_CTL0_TCIE;
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/* End of transmission, a callback is generated.*/
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_uart_tx2_isr_code(uartp);
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}
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/* Timeout interrupt sources are only checked if enabled in CR1.*/
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if ((ctl0 & USART_CTL0_IDLEIE) && (stat & USART_STAT_IDLEF)) {
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_uart_timeout_isr_code(uartp);
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}
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}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if GD32_UART_USE_USART0 || defined(__DOXYGEN__)
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#if !defined(GD32_USART0_HANDLER)
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#error "GD32_USART0_HANDLER not defined"
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#endif
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/**
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* @brief USART0 IRQ handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(GD32_USART0_HANDLER) {
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OSAL_IRQ_PROLOGUE();
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serve_usart_irq(&UARTD1);
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* GD32_UART_USE_USART0 */
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#if GD32_UART_USE_USART1 || defined(__DOXYGEN__)
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#if !defined(GD32_USART1_HANDLER)
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#error "GD32_USART1_HANDLER not defined"
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#endif
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/**
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* @brief USART1 IRQ handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(GD32_USART1_HANDLER) {
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OSAL_IRQ_PROLOGUE();
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serve_usart_irq(&UARTD2);
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* GD32_UART_USE_USART1 */
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#if GD32_UART_USE_USART2 || defined(__DOXYGEN__)
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#if !defined(GD32_USART2_HANDLER)
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#error "GD32_USART2_HANDLER not defined"
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#endif
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/**
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* @brief USART2 IRQ handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(GD32_USART2_HANDLER) {
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OSAL_IRQ_PROLOGUE();
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serve_usart_irq(&UARTD3);
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* GD32_UART_USE_USART2 */
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#if GD32_UART_USE_UART3 || defined(__DOXYGEN__)
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#if !defined(GD32_UART3_HANDLER)
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#error "GD32_UART3_HANDLER not defined"
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#endif
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/**
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* @brief UART3 IRQ handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(GD32_UART3_HANDLER) {
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OSAL_IRQ_PROLOGUE();
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serve_usart_irq(&UARTD4);
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* GD32_UART_USE_UART3 */
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#if GD32_UART_USE_UART4 || defined(__DOXYGEN__)
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#if !defined(GD32_UART4_HANDLER)
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#error "GD32_UART4_HANDLER not defined"
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#endif
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/**
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* @brief UART4 IRQ handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(GD32_UART4_HANDLER) {
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OSAL_IRQ_PROLOGUE();
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serve_usart_irq(&UARTD5);
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* GD32_UART_USE_UART4 */
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level UART driver initialization.
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*
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* @notapi
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*/
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void uart_lld_init(void) {
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#if GD32_UART_USE_USART0
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uartObjectInit(&UARTD1);
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UARTD1.usart = USART0;
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UARTD1.dmarxmode = GD32_DMA_CTL_ERRIE;
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UARTD1.dmatxmode = GD32_DMA_CTL_ERRIE;
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UARTD1.dmarx = NULL;
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UARTD1.dmatx = NULL;
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#endif
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#if GD32_UART_USE_USART1
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uartObjectInit(&UARTD2);
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UARTD2.usart = USART1;
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UARTD2.dmarxmode = GD32_DMA_CTL_ERRIE;
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UARTD2.dmatxmode = GD32_DMA_CTL_ERRIE;
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UARTD2.dmarx = NULL;
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UARTD2.dmatx = NULL;
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#endif
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#if GD32_UART_USE_USART2
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uartObjectInit(&UARTD3);
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UARTD3.usart = USART2;
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UARTD3.dmarxmode = GD32_DMA_CTL_ERRIE;
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UARTD3.dmatxmode = GD32_DMA_CTL_ERRIE;
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UARTD3.dmarx = NULL;
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UARTD3.dmatx = NULL;
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#endif
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#if GD32_UART_USE_UART3
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uartObjectInit(&UARTD4);
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UARTD4.usart = UART3;
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UARTD4.dmarxmode = GD32_DMA_CTL_ERRIE;
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UARTD4.dmatxmode = GD32_DMA_CTL_ERRIE;
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UARTD4.dmarx = NULL;
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UARTD4.dmatx = NULL;
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#endif
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#if GD32_UART_USE_UART4
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uartObjectInit(&UARTD5);
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UARTD5.usart = UART4;
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UARTD5.dmarxmode = GD32_DMA_CTL_ERRIE;
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UARTD5.dmatxmode = GD32_DMA_CTL_ERRIE;
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UARTD5.dmarx = NULL;
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UARTD5.dmatx = NULL;
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#endif
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}
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/**
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* @brief Configures and activates the UART peripheral.
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*
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* @param[in] uartp pointer to the @p UARTDriver object
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*
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* @notapi
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*/
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void uart_lld_start(UARTDriver *uartp) {
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if (uartp->state == UART_STOP) {
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#if GD32_UART_USE_USART0
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if (&UARTD1 == uartp) {
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uartp->dmarx = dmaStreamAllocI(GD32_UART_USART0_RX_DMA_STREAM,
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GD32_UART_USART0_IRQ_PRIORITY,
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(gd32_dmaisr_t)uart_lld_serve_rx_end_irq,
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(void *)uartp);
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osalDbgAssert(uartp->dmarx != NULL, "unable to allocate stream");
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uartp->dmatx = dmaStreamAllocI(GD32_UART_USART0_TX_DMA_STREAM,
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GD32_UART_USART0_IRQ_PRIORITY,
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(gd32_dmaisr_t)uart_lld_serve_tx_end_irq,
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(void *)uartp);
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osalDbgAssert(uartp->dmatx != NULL, "unable to allocate stream");
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rcuEnableUSART0(true);
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eclicEnableVector(GD32_USART0_NUMBER, GD32_UART_USART0_IRQ_PRIORITY, GD32_UART_USART0_IRQ_TRIGGER);
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uartp->dmarxmode |= GD32_DMA_CTL_CHSEL(USART0_RX_DMA_CHANNEL) |
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GD32_DMA_CTL_PRIO(GD32_UART_USART0_DMA_PRIORITY);
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uartp->dmatxmode |= GD32_DMA_CTL_CHSEL(USART0_TX_DMA_CHANNEL) |
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GD32_DMA_CTL_PRIO(GD32_UART_USART0_DMA_PRIORITY);
|
|
}
|
|
#endif
|
|
|
|
#if GD32_UART_USE_USART1
|
|
if (&UARTD2 == uartp) {
|
|
uartp->dmarx = dmaStreamAllocI(GD32_UART_USART1_RX_DMA_STREAM,
|
|
GD32_UART_USART1_IRQ_PRIORITY,
|
|
(gd32_dmaisr_t)uart_lld_serve_rx_end_irq,
|
|
(void *)uartp);
|
|
osalDbgAssert(uartp->dmarx != NULL, "unable to allocate stream");
|
|
uartp->dmatx = dmaStreamAllocI(GD32_UART_USART1_TX_DMA_STREAM,
|
|
GD32_UART_USART1_IRQ_PRIORITY,
|
|
(gd32_dmaisr_t)uart_lld_serve_tx_end_irq,
|
|
(void *)uartp);
|
|
osalDbgAssert(uartp->dmatx != NULL, "unable to allocate stream");
|
|
|
|
rcuEnableUSART1(true);
|
|
eclicEnableVector(GD32_USART1_NUMBER, GD32_UART_USART1_IRQ_PRIORITY, GD32_UART_USART1_IRQ_TRIGGER);
|
|
uartp->dmarxmode |= GD32_DMA_CTL_CHSEL(USART1_RX_DMA_CHANNEL) |
|
|
GD32_DMA_CTL_PRIO(GD32_UART_USART1_DMA_PRIORITY);
|
|
uartp->dmatxmode |= GD32_DMA_CTL_CHSEL(USART1_TX_DMA_CHANNEL) |
|
|
GD32_DMA_CTL_PRIO(GD32_UART_USART1_DMA_PRIORITY);
|
|
}
|
|
#endif
|
|
|
|
#if GD32_UART_USE_USART2
|
|
if (&UARTD3 == uartp) {
|
|
uartp->dmarx = dmaStreamAllocI(GD32_UART_USART2_RX_DMA_STREAM,
|
|
GD32_UART_USART2_IRQ_PRIORITY,
|
|
(gd32_dmaisr_t)uart_lld_serve_rx_end_irq,
|
|
(void *)uartp);
|
|
osalDbgAssert(uartp->dmarx != NULL, "unable to allocate stream");
|
|
uartp->dmatx = dmaStreamAllocI(GD32_UART_USART2_TX_DMA_STREAM,
|
|
GD32_UART_USART2_IRQ_PRIORITY,
|
|
(gd32_dmaisr_t)uart_lld_serve_tx_end_irq,
|
|
(void *)uartp);
|
|
osalDbgAssert(uartp->dmatx != NULL, "unable to allocate stream");
|
|
|
|
rcuEnableUSART2(true);
|
|
eclicEnableVector(GD32_USART2_NUMBER, GD32_UART_USART2_IRQ_PRIORITY, GD32_UART_USART2_IRQ_TRIGGER);
|
|
uartp->dmarxmode |= GD32_DMA_CTL_CHSEL(USART2_RX_DMA_CHANNEL) |
|
|
GD32_DMA_CTL_PRIO(GD32_UART_USART2_DMA_PRIORITY);
|
|
uartp->dmatxmode |= GD32_DMA_CTL_CHSEL(USART2_TX_DMA_CHANNEL) |
|
|
GD32_DMA_CTL_PRIO(GD32_UART_USART2_DMA_PRIORITY);
|
|
}
|
|
#endif
|
|
|
|
#if GD32_UART_USE_UART3
|
|
if (&UARTD4 == uartp) {
|
|
|
|
osalDbgAssert((uartp->config->ctl1 & GD32_UART34_CR2_CHECK_MASK) == 0,
|
|
"specified invalid bits in UART3 CR2 register settings");
|
|
osalDbgAssert((uartp->config->ctl2 & GD32_UART35_CR3_CHECK_MASK) == 0,
|
|
"specified invalid bits in UART3 CR3 register settings");
|
|
|
|
uartp->dmarx = dmaStreamAllocI(GD32_UART_UART3_RX_DMA_STREAM,
|
|
GD32_UART_UART3_IRQ_PRIORITY,
|
|
(gd32_dmaisr_t)uart_lld_serve_rx_end_irq,
|
|
(void *)uartp);
|
|
osalDbgAssert(uartp->dmarx != NULL, "unable to allocate stream");
|
|
uartp->dmatx = dmaStreamAllocI(GD32_UART_UART3_TX_DMA_STREAM,
|
|
GD32_UART_UART3_IRQ_PRIORITY,
|
|
(gd32_dmaisr_t)uart_lld_serve_tx_end_irq,
|
|
(void *)uartp);
|
|
osalDbgAssert(uartp->dmatx != NULL, "unable to allocate stream");
|
|
|
|
rcuEnableUART3(true);
|
|
eclicEnableVector(GD32_UART3_NUMBER, GD32_UART_UART3_IRQ_PRIORITY, GD32_UART_UART3_IRQ_TRIGGER);
|
|
uartp->dmarxmode |= GD32_DMA_CTL_CHSEL(UART3_RX_DMA_CHANNEL) |
|
|
GD32_DMA_CTL_PRIO(GD32_UART_UART3_DMA_PRIORITY);
|
|
uartp->dmatxmode |= GD32_DMA_CTL_CHSEL(UART3_TX_DMA_CHANNEL) |
|
|
GD32_DMA_CTL_PRIO(GD32_UART_UART3_DMA_PRIORITY);
|
|
}
|
|
#endif
|
|
|
|
#if GD32_UART_USE_UART4
|
|
if (&UARTD5 == uartp) {
|
|
|
|
osalDbgAssert((uartp->config->ctl1 & GD32_UART34_CR2_CHECK_MASK) == 0,
|
|
"specified invalid bits in UART4 CR2 register settings");
|
|
osalDbgAssert((uartp->config->ctl2 & GD32_UART35_CR3_CHECK_MASK) == 0,
|
|
"specified invalid bits in UART4 CR3 register settings");
|
|
|
|
uartp->dmarx = dmaStreamAllocI(GD32_UART_UART4_RX_DMA_STREAM,
|
|
GD32_UART_UART4_IRQ_PRIORITY,
|
|
(gd32_dmaisr_t)uart_lld_serve_rx_end_irq,
|
|
(void *)uartp);
|
|
osalDbgAssert(uartp->dmarx != NULL, "unable to allocate stream");
|
|
uartp->dmatx = dmaStreamAllocI(GD32_UART_UART4_TX_DMA_STREAM,
|
|
GD32_UART_UART4_IRQ_PRIORITY,
|
|
(gd32_dmaisr_t)uart_lld_serve_tx_end_irq,
|
|
(void *)uartp);
|
|
osalDbgAssert(uartp->dmatx != NULL, "unable to allocate stream");
|
|
|
|
rcuEnableUART4(true);
|
|
eclicEnableVector(GD32_UART4_NUMBER, GD32_UART_UART4_IRQ_PRIORITY, GD32_UART_UART4_IRQ_TRIGGER);
|
|
uartp->dmarxmode |= GD32_DMA_CTL_CHSEL(UART4_RX_DMA_CHANNEL) |
|
|
GD32_DMA_CTL_PRIO(GD32_UART_UART4_DMA_PRIORITY);
|
|
uartp->dmatxmode |= GD32_DMA_CTL_CHSEL(UART4_TX_DMA_CHANNEL) |
|
|
GD32_DMA_CTL_PRIO(GD32_UART_UART4_DMA_PRIORITY);
|
|
}
|
|
#endif
|
|
|
|
/* Static DMA setup, the transfer size depends on the USART settings,
|
|
it is 16 bits if M=1 and PCE=0 else it is 8 bits.*/
|
|
if ((uartp->config->ctl0 & (USART_CTL0_WL | USART_CTL0_PCEN)) == USART_CTL0_WL) {
|
|
uartp->dmarxmode |= GD32_DMA_CTL_PWIDTH_HWORD | GD32_DMA_CTL_MWIDTH_HWORD;
|
|
uartp->dmatxmode |= GD32_DMA_CTL_PWIDTH_HWORD | GD32_DMA_CTL_MWIDTH_HWORD;
|
|
}
|
|
dmaStreamSetPeripheral(uartp->dmarx, &uartp->usart->DATA);
|
|
dmaStreamSetPeripheral(uartp->dmatx, &uartp->usart->DATA);
|
|
uartp->rxbuf = 0;
|
|
}
|
|
|
|
uartp->rxstate = UART_RX_IDLE;
|
|
uartp->txstate = UART_TX_IDLE;
|
|
usart_start(uartp);
|
|
}
|
|
|
|
/**
|
|
* @brief Deactivates the UART peripheral.
|
|
*
|
|
* @param[in] uartp pointer to the @p UARTDriver object
|
|
*
|
|
* @notapi
|
|
*/
|
|
void uart_lld_stop(UARTDriver *uartp) {
|
|
|
|
if (uartp->state == UART_READY) {
|
|
usart_stop(uartp);
|
|
dmaStreamFreeI(uartp->dmarx);
|
|
dmaStreamFreeI(uartp->dmatx);
|
|
uartp->dmarx = NULL;
|
|
uartp->dmatx = NULL;
|
|
|
|
#if GD32_UART_USE_USART0
|
|
if (&UARTD1 == uartp) {
|
|
eclicDisableVector(GD32_USART0_NUMBER);
|
|
rcuDisableUSART0();
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#if GD32_UART_USE_USART1
|
|
if (&UARTD2 == uartp) {
|
|
eclicDisableVector(GD32_USART1_NUMBER);
|
|
rcuDisableUSART1();
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#if GD32_UART_USE_USART2
|
|
if (&UARTD3 == uartp) {
|
|
eclicDisableVector(GD32_USART2_NUMBER);
|
|
rcuDisableUSART2();
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#if GD32_UART_USE_UART3
|
|
if (&UARTD4 == uartp) {
|
|
eclicDisableVector(GD32_UART3_NUMBER);
|
|
rcuDisableUART3();
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#if GD32_UART_USE_UART4
|
|
if (&UARTD5 == uartp) {
|
|
eclicDisableVector(GD32_UART4_NUMBER);
|
|
rcuDisableUART4();
|
|
return;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Starts a transmission on the UART peripheral.
|
|
* @note The buffers are organized as uint8_t arrays for data sizes below
|
|
* or equal to 8 bits else it is organized as uint16_t arrays.
|
|
*
|
|
* @param[in] uartp pointer to the @p UARTDriver object
|
|
* @param[in] n number of data frames to send
|
|
* @param[in] txbuf the pointer to the transmit buffer
|
|
*
|
|
* @notapi
|
|
*/
|
|
void uart_lld_start_send(UARTDriver *uartp, size_t n, const void *txbuf) {
|
|
|
|
/* TX DMA channel preparation.*/
|
|
dmaStreamSetMemory0(uartp->dmatx, txbuf);
|
|
dmaStreamSetTransactionSize(uartp->dmatx, n);
|
|
dmaStreamSetMode(uartp->dmatx, uartp->dmatxmode | GD32_DMA_CTL_DIR_M2P |
|
|
GD32_DMA_CTL_MNAGA | GD32_DMA_CTL_FTFIE);
|
|
|
|
/* Only enable TC interrupt if there's a callback attached to it or
|
|
if called from uartSendFullTimeout(). Also we need to clear TC flag
|
|
which could be set before.*/
|
|
#if UART_USE_WAIT == TRUE
|
|
if ((uartp->config->txend2_cb != NULL) || (uartp->early == false)) {
|
|
#else
|
|
if (uartp->config->txend2_cb != NULL) {
|
|
#endif
|
|
uartp->usart->STAT = ~USART_STAT_TC;
|
|
uartp->usart->CTL0 |= USART_CTL0_TCIE;
|
|
}
|
|
|
|
/* Starting transfer.*/
|
|
dmaStreamEnable(uartp->dmatx);
|
|
}
|
|
|
|
/**
|
|
* @brief Stops any ongoing transmission.
|
|
* @note Stopping a transmission also suppresses the transmission callbacks.
|
|
*
|
|
* @param[in] uartp pointer to the @p UARTDriver object
|
|
*
|
|
* @return The number of data frames not transmitted by the
|
|
* stopped transmit operation.
|
|
*
|
|
* @notapi
|
|
*/
|
|
size_t uart_lld_stop_send(UARTDriver *uartp) {
|
|
|
|
dmaStreamDisable(uartp->dmatx);
|
|
|
|
return dmaStreamGetTransactionSize(uartp->dmatx);
|
|
}
|
|
|
|
/**
|
|
* @brief Starts a receive operation on the UART peripheral.
|
|
* @note The buffers are organized as uint8_t arrays for data sizes below
|
|
* or equal to 8 bits else it is organized as uint16_t arrays.
|
|
*
|
|
* @param[in] uartp pointer to the @p UARTDriver object
|
|
* @param[in] n number of data frames to send
|
|
* @param[out] rxbuf the pointer to the receive buffer
|
|
*
|
|
* @notapi
|
|
*/
|
|
void uart_lld_start_receive(UARTDriver *uartp, size_t n, void *rxbuf) {
|
|
|
|
/* Stopping previous activity (idle state).*/
|
|
dmaStreamDisable(uartp->dmarx);
|
|
|
|
/* RX DMA channel preparation.*/
|
|
dmaStreamSetMemory0(uartp->dmarx, rxbuf);
|
|
dmaStreamSetTransactionSize(uartp->dmarx, n);
|
|
dmaStreamSetMode(uartp->dmarx, uartp->dmarxmode | GD32_DMA_CTL_DIR_P2M |
|
|
GD32_DMA_CTL_MNAGA | GD32_DMA_CTL_FTFIE);
|
|
|
|
/* Starting transfer.*/
|
|
dmaStreamEnable(uartp->dmarx);
|
|
}
|
|
|
|
/**
|
|
* @brief Stops any ongoing receive operation.
|
|
* @note Stopping a receive operation also suppresses the receive callbacks.
|
|
*
|
|
* @param[in] uartp pointer to the @p UARTDriver object
|
|
*
|
|
* @return The number of data frames not received by the
|
|
* stopped receive operation.
|
|
*
|
|
* @notapi
|
|
*/
|
|
size_t uart_lld_stop_receive(UARTDriver *uartp) {
|
|
size_t n;
|
|
|
|
dmaStreamDisable(uartp->dmarx);
|
|
n = dmaStreamGetTransactionSize(uartp->dmarx);
|
|
uart_enter_rx_idle_loop(uartp);
|
|
|
|
return n;
|
|
}
|
|
|
|
#endif /* HAL_USE_UART */
|
|
|
|
/** @} */
|