Add initial serial driver
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# List of all the NRF51x platform files.
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PLATFORMSRC = ${CHIBIOS}/os/hal/ports/common/ARMCMx/nvic.c \
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${CHIBIOS}/community/os/hal/ports/NRF51/NRF51822/hal_lld.c \
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${CHIBIOS}/community/os/hal/ports/NRF51/NRF51822/serial_lld.c \
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${CHIBIOS}/community/os/hal/ports/NRF51/NRF51822/st_lld.c
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# Required include directories
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/*
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Copyright (C) 2015 Fabio Utzig
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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 serial_lld.c
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* @brief NRF51822 serial subsystem low level driver source.
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*
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* @addtogroup SERIAL
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* @{
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*/
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#include "hal.h"
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#if (HAL_USE_SERIAL == TRUE) || defined(__DOXYGEN__)
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#include "nrf51.h"
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/** @brief USART1 serial driver identifier.*/
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#if (NRF51_SERIAL_USE_UART0 == TRUE) || defined(__DOXYGEN__)
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SerialDriver SD1;
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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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* @brief Driver default configuration.
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*/
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static const SerialConfig default_config = {
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38400
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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 Driver output notification.
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*/
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#if NRF51_SERIAL_USE_UART0 || defined(__DOXYGEN__)
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static void notify1(io_queue_t *qp)
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{
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(void)qp;
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//if (NRF_UART0->EVENTS_TXDRDY) {
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msg_t b = oqGetI(&SD1.oqueue);
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if (b < Q_OK) {
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chnAddFlagsI(&SD1, CHN_OUTPUT_EMPTY);
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return;
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}
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NRF_UART0->TXD = b;
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//NRF_UART0->INTENCLR = 0x80; // clear TX interrupt
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//}
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}
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#endif
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if NRF51_SERIAL_USE_UART0 || defined(__DOXYGEN__)
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OSAL_IRQ_HANDLER(Vector48) {
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OSAL_IRQ_PROLOGUE();
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if (NRF_UART0->EVENTS_RXDRDY) {
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osalSysLockFromISR();
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if (iqIsEmptyI(&SD1.iqueue))
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chnAddFlagsI(&SD1, CHN_INPUT_AVAILABLE);
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if (iqPutI(&SD1.iqueue, NRF_UART0->RXD) < Q_OK)
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chnAddFlagsI(&SD1, SD_OVERRUN_ERROR);
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//NRF_UART0->INTENCLR = 4;
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osalSysUnlockFromISR();
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}
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if (NRF_UART0->EVENTS_TXDRDY) {
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msg_t b;
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osalSysLockFromISR();
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b = oqGetI(&SD1.oqueue);
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osalSysUnlockFromISR();
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if (b < Q_OK) {
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osalSysLockFromISR();
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chnAddFlagsI(&SD1, CHN_OUTPUT_EMPTY);
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osalSysUnlockFromISR();
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NRF_UART0->INTENCLR = 0x80; // clear TX interrupt
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} else {
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NRF_UART0->TXD = b;
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}
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}
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OSAL_IRQ_EPILOGUE();
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}
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#endif
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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 serial driver initialization.
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*
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* @notapi
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*/
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void sd_lld_init(void) {
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#if NRF51_SERIAL_USE_UART0 == TRUE
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sdObjectInit(&SD1, NULL, notify1);
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#endif
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}
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/**
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* @brief Low level serial driver configuration and (re)start.
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*
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* @param[in] sdp pointer to a @p SerialDriver object
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* @param[in] config the architecture-dependent serial driver configuration.
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* If this parameter is set to @p NULL then a default
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* configuration is used.
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*
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* @notapi
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*/
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void sd_lld_start(SerialDriver *sdp, const SerialConfig *config) {
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if (config == NULL) {
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config = &default_config;
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}
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if (sdp->state == SD_STOP) {
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#if NRF51_SERIAL_USE_UART0 == TRUE
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if (sdp == &SD1) {
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/* FIXME: some board specific, some hardcodeds! */
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/* Configure PINs */
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NRF_UART0->PSELRTS = ~0;
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NRF_UART0->PSELCTS = ~0;
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NRF_GPIO->PIN_CNF[9] = 1;
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NRF_UART0->PSELTXD = 9;
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NRF_UART0->PSELRXD = 11;
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/* 38400!!! */
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NRF_UART0->BAUDRATE = 0x009D5000;
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/* Enable interrupts for RX, TX and ERROR */
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NRF_UART0->INTENSET = 0x284;
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nvicEnableVector(UART0_IRQn, 12);
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NRF_UART0->ENABLE = 4;
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NRF_UART0->TASKS_STARTRX = 1;
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NRF_UART0->TASKS_STARTTX = 1;
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}
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#endif
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}
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}
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/**
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* @brief Low level serial driver stop.
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* @details De-initializes the USART, stops the associated clock, resets the
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* interrupt vector.
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*
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* @param[in] sdp pointer to a @p SerialDriver object
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*
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* @notapi
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*/
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void sd_lld_stop(SerialDriver *sdp) {
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if (sdp->state == SD_READY) {
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#if NRF51_SERIAL_USE_UART0 == TRUE
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if (&SD1 == sdp) {
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nvicDisableVector(UART0_IRQn);
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}
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#endif
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}
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}
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#endif /* HAL_USE_SERIAL == TRUE */
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/** @} */
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/*
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Copyright (C) 2015 Fabio Utzig
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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 serial_lld.h
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* @brief NRF51822 serial subsystem low level driver header.
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*
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* @addtogroup SERIAL
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* @{
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*/
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#ifndef _SERIAL_LLD_H_
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#define _SERIAL_LLD_H_
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#if (HAL_USE_SERIAL == TRUE) || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver constants. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver pre-compile time settings. */
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/*===========================================================================*/
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/**
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* @name PLATFORM configuration options
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* @{
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*/
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/**
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* @brief USART1 driver enable switch.
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* @details If set to @p TRUE the support for USART1 is included.
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* @note The default is @p FALSE.
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*/
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#if !defined(NRF51_SERIAL_USE_UART0) || defined(__DOXYGEN__)
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#define NRF51_SERIAL_USE_UART0 FALSE
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#endif
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/** @} */
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver data structures and types. */
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/*===========================================================================*/
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/**
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* @brief NRF51 Serial Driver configuration structure.
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* @details An instance of this structure must be passed to @p sdStart()
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* in order to configure and start a serial driver operations.
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* @note This structure content is architecture dependent, each driver
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* implementation defines its own version and the custom static
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* initializers.
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*/
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typedef struct {
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/**
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* @brief Bit rate.
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*/
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uint32_t speed;
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/* End of the mandatory fields.*/
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} SerialConfig;
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/**
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* @brief @p SerialDriver specific data.
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*/
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#define _serial_driver_data \
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_base_asynchronous_channel_data \
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/* Driver state.*/ \
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sdstate_t state; \
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/* Input queue.*/ \
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input_queue_t iqueue; \
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/* Output queue.*/ \
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output_queue_t oqueue; \
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/* Input circular buffer.*/ \
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uint8_t ib[SERIAL_BUFFERS_SIZE]; \
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/* Output circular buffer.*/ \
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uint8_t ob[SERIAL_BUFFERS_SIZE]; \
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/* End of the mandatory fields.*/
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/*===========================================================================*/
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/* Driver macros. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#if (NRF51_SERIAL_USE_UART0 == TRUE) && !defined(__DOXYGEN__)
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extern SerialDriver SD1;
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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void sd_lld_init(void);
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void sd_lld_start(SerialDriver *sdp, const SerialConfig *config);
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void sd_lld_stop(SerialDriver *sdp);
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#ifdef __cplusplus
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}
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#endif
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#endif /* HAL_USE_SERIAL == TRUE */
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#endif /* _SERIAL_LLD_H_ */
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/** @} */
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