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ChibiOS/os/hal/platforms/LPC8xx/serial_lld.c

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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file LPC8xx/serial_lld.c
* @brief LPC8xx low level serial driver code.
*
* @addtogroup SERIAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_SERIAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
#if LPC8xx_SERIAL_USE_UART0 || defined(__DOXYGEN__)
/** @brief UART0 serial driver identifier.*/
SerialDriver SD1;
#endif
#if LPC8xx_SERIAL_USE_UART1 || defined(__DOXYGEN__)
/** @brief UART1 serial driver identifier.*/
SerialDriver SD2;
#endif
#if LPC8xx_SERIAL_USE_UART2 || defined(__DOXYGEN__)
/** @brief UART2 serial driver identifier.*/
SerialDriver SD3;
#endif
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/** @brief Driver default configuration.*/
static const SerialConfig default_config = {
SERIAL_DEFAULT_BITRATE,
(CFG_DL8 | CFG_NOPARITY | CFG_STOP1)
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Error handling routine.
*
* @param[in] sdp communication channel associated to the UART
* @param[in] err UART STAT register value
*/
static void set_error(SerialDriver *sdp, IOREG32 err) {
flagsmask_t sts = 0;
if (err & STAT_OVERRUN)
sts |= SD_OVERRUN_ERROR;
if (err & STAT_PARITYERR)
sts |= SD_PARITY_ERROR;
if (err & STAT_FRAMERR)
sts |= SD_FRAMING_ERROR;
if (err & STAT_RXBRK)
sts |= SD_BREAK_DETECTED;
chSysLockFromIsr();
chnAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
/**
* @brief Common IRQ handler.
* @note Tries hard to clear all the pending interrupt sources, we don't
* want to go through the whole ISR and have another interrupt soon
* after.
*
* @param[in] u pointer to an UART I/O block
* @param[in] sdp communication channel associated to the UART
*/
static void serve_interrupt(SerialDriver *sdp) {
LPC_USART_TypeDef *u = sdp->uart;
while (u->INTSTAT) {
if (u->INTSTAT & STAT_RXRDY) {
chSysLockFromIsr();
if (chIQIsEmptyI(&sdp->iqueue))
chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
if (chIQPutI(&sdp->iqueue, u->RXDATA) < Q_OK)
chnAddFlagsI(sdp, SD_OVERRUN_ERROR);
chSysUnlockFromIsr();
}
if (u->INTSTAT & STAT_TXRDY) {
msg_t b;
chSysLockFromIsr();
b = chOQGetI(&sdp->oqueue);
chSysUnlockFromIsr();
if (b < Q_OK) {
u->INTENCLR = STAT_TXRDY;
chSysLockFromIsr();
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
chSysUnlockFromIsr();
break;
}
else {
u->TXDATA = b;
}
}
if (u->INTSTAT & (STAT_OVERRUN | STAT_DELTARXBRK |
STAT_FRAMERR | STAT_PARITYERR) ) {
IOREG32 stat = u->STAT;
set_error(sdp, stat);
u->STAT = stat;
}
}
}
/**
* @brief Attempts a TX preload.
*/
static void preload(SerialDriver *sdp) {
LPC_USART_TypeDef *u = sdp->uart;
if (u->STAT & STAT_TXIDLE) {
msg_t b = chOQGetI(&sdp->oqueue);
if (b < Q_OK) {
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
return;
}
u->TXDATA = b;
}
u->INTENSET = STAT_TXRDY;
}
/**
* @brief Driver output notification.
*/
#if LPC8xx_SERIAL_USE_UART0 || defined(__DOXYGEN__)
static void notify1(GenericQueue *qp) {
(void)qp;
preload(&SD1);
}
#endif
#if LPC8xx_SERIAL_USE_UART1 || defined(__DOXYGEN__)
static void notify2(GenericQueue *qp) {
(void)qp;
preload(&SD2);
}
#endif
#if LPC8xx_SERIAL_USE_UART2 || defined(__DOXYGEN__)
static void notify3(GenericQueue *qp) {
(void)qp;
preload(&SD3);
}
#endif
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/**
* @brief UARTn IRQ handlers.
*
* @isr
*/
#if LPC8xx_SERIAL_USE_UART0 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(Vector4C) {
CH_IRQ_PROLOGUE();
serve_interrupt( &SD1 );
CH_IRQ_EPILOGUE();
}
#endif
#if LPC8xx_SERIAL_USE_UART1 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(Vector50) {
CH_IRQ_PROLOGUE();
serve_interrupt( &SD2 );
CH_IRQ_EPILOGUE();
}
#endif
#if LPC8xx_SERIAL_USE_UART2 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(Vector54) {
CH_IRQ_PROLOGUE();
serve_interrupt( &SD3 );
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level serial driver initialization.
*
* @notapi
*/
void sd_lld_init(void) {
#if LPC8xx_SERIAL_USE_UART0
sdObjectInit(&SD1, NULL, notify1);
SD1.uart = LPC_USART0;
#endif
#if LPC8xx_SERIAL_USE_UART1
sdObjectInit(&SD2, NULL, notify2);
SD2.uart = LPC_USART1;
#endif
#if LPC8xx_SERIAL_USE_UART2
sdObjectInit(&SD3, NULL, notify3);
SD3.uart = LPC_USART2;
#endif
/* Reset fractional baudrate generator */
LPC_SYSCON->PRESETCTRL &= ~(1<<2);
LPC_SYSCON->PRESETCTRL |= (1<<2);
LPC_SYSCON->UARTCLKDIV = LPC8xx_SERIAL_UARTCLKDIV;
LPC_SYSCON->UARTFRGDIV = LPC8xx_SERIAL_UARTFRGDIV;
LPC_SYSCON->UARTFRGMULT = LPC8xx_SERIAL_UARTFRGMULT;
}
/**
* @brief Low level serial driver configuration and (re)start.
*
* @param[in] sdp pointer to a @p SerialDriver object
* @param[in] config the architecture-dependent serial driver configuration.
* If this parameter is set to @p NULL then a default
* configuration is used.
*
* @notapi
*/
void sd_lld_start( SerialDriver *sdp, const SerialConfig *config ) {
if (config == NULL)
config = &default_config;
if (sdp->state == SD_STOP) {
#if LPC8xx_SERIAL_USE_UART0
if (&SD1 == sdp) {
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<14); // Enable Clk
LPC_SYSCON->PRESETCTRL &= ~(1<<3); // Reset peripheral
LPC_SYSCON->PRESETCTRL |= (1<<3);
nvicEnableVector(UART0_IRQn,
CORTEX_PRIORITY_MASK(LPC8xx_SERIAL_UART0_IRQ_PRIORITY));
}
#endif
#if LPC8xx_SERIAL_USE_UART1
if (&SD2 == sdp) {
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<15); // Enable Clk
LPC_SYSCON->PRESETCTRL &= ~(1<<4); // Reset peripheral
LPC_SYSCON->PRESETCTRL |= (1<<4);
nvicEnableVector(UART1_IRQn,
CORTEX_PRIORITY_MASK(LPC8xx_SERIAL_UART1_IRQ_PRIORITY));
}
#endif
#if LPC8xx_SERIAL_USE_UART2
if (&SD3 == sdp) {
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<16); // Enable Clk
LPC_SYSCON->PRESETCTRL &= ~(1<<5); // Reset peripheral
LPC_SYSCON->PRESETCTRL |= (1<<5);
nvicEnableVector(UART2_IRQn,
CORTEX_PRIORITY_MASK(LPC8xx_SERIAL_UART2_IRQ_PRIORITY));
}
#endif
}
sdp->uart->BRG = (LPC8xx_SERIAL_U_PCLK / (config->sc_speed << 4)) -1;
sdp->uart->INTENSET = STAT_FRAMERR | STAT_OVERRUN |
STAT_PARITYERR | STAT_DELTARXBRK |
STAT_RXRDY;
sdp->uart->CFG = config->sc_cfg | CFG_ENA;
}
/**
* @brief Low level serial driver stop.
* @details De-initializes the UART, stops the associated clock, resets the
* interrupt vector.
*
* @param[in] sdp pointer to a @p SerialDriver object
*
* @notapi
*/
void sd_lld_stop( SerialDriver *sdp ) {
if (sdp->state == SD_READY) {
sdp->uart->INTENCLR = STAT_TXRDY | STAT_RXRDY;
sdp->uart->CFG = 0;
#if LPC8xx_SERIAL_USE_UART0
if (&SD1 == sdp) {
LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<12);
nvicDisableVector(UART0_IRQn);
return;
}
#endif
#if LPC8xx_SERIAL_USE_UART1
if (&SD2 == sdp) {
LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<13);
nvicDisableVector(UART1_IRQn);
return;
}
#endif
#if LPC8xx_SERIAL_USE_UART2
if (&SD3 == sdp) {
LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<14);
nvicDisableVector(UART2_IRQn);
return;
}
#endif
}
}
#endif /* HAL_USE_SERIAL */
/** @} */
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