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

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/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @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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