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tinySA/os/hal/platforms/STM8S/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 STM8S/serial_lld.c
* @brief STM8S low level serial driver code.
*
* @addtogroup SERIAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_SERIAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief UART1 serial driver identifier.
*/
#if STM8S_SERIAL_USE_UART1 || defined(__DOXYGEN__)
SerialDriver SD1;
#endif
/**
* @brief UART2 serial driver identifier.
*/
#if STM8S_SERIAL_USE_UART2 || defined(__DOXYGEN__)
SerialDriver SD2;
#endif
/**
* @brief UART3 serial driver identifier.
*/
#if STM8S_SERIAL_USE_UART3 || defined(__DOXYGEN__)
SerialDriver SD3;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/**
* @brief Driver default configuration.
*/
static ROMCONST SerialConfig default_config = {
BRR(SERIAL_DEFAULT_BITRATE),
SD_MODE_PARITY_NONE | SD_MODE_STOP_1
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
static void set_error(SerialDriver *sdp, uint8_t sr) {
flagsmask_t sts = 0;
/* Note, SR register bit definitions are equal for all UARTs so using
the UART1 definitions is fine.*/
if (sr & UART1_SR_OR)
sts |= SD_OVERRUN_ERROR;
if (sr & UART1_SR_NF)
sts |= SD_NOISE_ERROR;
if (sr & UART1_SR_FE)
sts |= SD_FRAMING_ERROR;
if (sr & UART1_SR_PE)
sts |= SD_PARITY_ERROR;
chSysLockFromIsr();
chnAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
#if STM8S_SERIAL_USE_UART1 || defined(__DOXYGEN__)
static void notify1(GenericQueue *qp) {
(void)qp;
UART1->CR2 |= UART1_CR2_TIEN;
}
/**
* @brief UART1 initialization.
*
* @param[in] config architecture-dependent serial driver configuration
*/
static void uart1_init(const SerialConfig *config) {
UART1->BRR2 = (uint8_t)(((uint8_t)(config->sc_brr >> 8) & (uint8_t)0xF0) |
((uint8_t)config->sc_brr & (uint8_t)0x0F));
UART1->BRR1 = (uint8_t)(config->sc_brr >> 4);
UART1->CR1 = (uint8_t)(config->sc_mode &
SD_MODE_PARITY); /* PIEN included. */
UART1->CR2 = UART1_CR2_RIEN | UART1_CR2_TEN | UART1_CR2_REN;
UART1->CR3 = (uint8_t)(config->sc_mode & SD_MODE_STOP);
UART1->CR4 = 0;
UART1->CR5 = 0;
UART1->PSCR = 1;
(void)UART1->SR;
(void)UART1->DR;
}
/**
* @brief UART1 de-initialization.
*/
static void uart1_deinit(void) {
UART1->CR1 = UART1_CR1_UARTD;
UART1->CR2 = 0;
UART1->CR3 = 0;
UART1->CR4 = 0;
UART1->CR5 = 0;
UART1->PSCR = 0;
}
#endif /* STM8S_SERIAL_USE_UART1 */
#if STM8S_SERIAL_USE_UART2 || defined(__DOXYGEN__)
static void notify2(GenericQueue *qp) {
(void)qp;
UART2->CR2 |= UART2_CR2_TIEN;
}
/**
* @brief UART2 initialization.
*
* @param[in] config architecture-dependent serial driver configuration
*/
static void uart2_init(const SerialConfig *config) {
UART2->BRR2 = (uint8_t)(((uint8_t)(config->sc_brr >> 8) & (uint8_t)0xF0) |
((uint8_t)config->sc_brr & (uint8_t)0x0F));
UART2->BRR1 = (uint8_t)(config->sc_brr >> 4);
UART2->CR1 = (uint8_t)(config->sc_mode &
SD_MODE_PARITY); /* PIEN included. */
UART2->CR2 = UART2_CR2_RIEN | UART2_CR2_TEN | UART2_CR2_REN;
UART2->CR3 = (uint8_t)(config->sc_mode & SD_MODE_STOP);
UART2->CR4 = 0;
UART2->CR5 = 0;
UART2->CR6 = 0;
UART2->PSCR = 1;
(void)UART2->SR;
(void)UART2->DR;
}
/**
* @brief UART1 de-initialization.
*/
static void uart2_deinit(void) {
UART2->CR1 = UART2_CR1_UARTD;
UART2->CR2 = 0;
UART2->CR3 = 0;
UART2->CR4 = 0;
UART2->CR5 = 0;
UART2->CR6 = 0;
UART2->PSCR = 0;
}
#endif /* STM8S_SERIAL_USE_UART1 */
#if STM8S_SERIAL_USE_UART3 || defined(__DOXYGEN__)
static void notify3(GenericQueue *qp) {
(void)qp;
UART3->CR2 |= UART3_CR2_TIEN;
}
/**
* @brief UART3 initialization.
*
* @param[in] config architecture-dependent serial driver configuration
*/
static void uart3_init(const SerialConfig *config) {
UART3->BRR2 = (uint8_t)(((uint8_t)(config->sc_brr >> 8) & (uint8_t)0xF0) |
((uint8_t)config->sc_brr & (uint8_t)0x0F));
UART3->BRR1 = (uint8_t)(config->sc_brr >> 4);
UART3->CR1 = (uint8_t)(config->sc_mode &
SD_MODE_PARITY); /* PIEN included. */
UART3->CR2 = UART3_CR2_RIEN | UART3_CR2_TEN | UART3_CR2_REN;
UART3->CR3 = (uint8_t)(config->sc_mode & SD_MODE_STOP);
UART3->CR4 = 0;
UART3->CR6 = 0;
(void)UART3->SR;
(void)UART3->DR;
}
/**
* @brief UART3 de-initialization.
*/
static void uart3_deinit(void) {
UART3->CR1 = UART3_CR1_UARTD;
UART3->CR2 = 0;
UART3->CR3 = 0;
UART3->CR4 = 0;
UART3->CR6 = 0;
}
#endif /* STM8S_SERIAL_USE_UART3 */
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if STM8S_SERIAL_USE_UART1 || defined(__DOXYGEN__)
/**
* @brief IRQ 17 service routine.
*
* @isr
*/
CH_IRQ_HANDLER(17) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = sdRequestDataI(&SD1);
chSysUnlockFromIsr();
if (b < Q_OK)
UART1->CR2 &= (uint8_t)~UART1_CR2_TIEN;
else
UART1->DR = (uint8_t)b;
CH_IRQ_EPILOGUE();
}
/**
* @brief IRQ 18 service routine.
*
* @isr
*/
CH_IRQ_HANDLER(18) {
uint8_t sr = UART1->SR;
CH_IRQ_PROLOGUE();
if ((sr = UART1->SR) & (UART1_SR_OR | UART1_SR_NF |
UART1_SR_FE | UART1_SR_PE))
set_error(&SD1, sr);
chSysLockFromIsr();
sdIncomingDataI(&SD1, UART1->DR);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
#endif /* STM8S_SERIAL_USE_UART1 */
#if STM8S_SERIAL_USE_UART2 || defined(__DOXYGEN__)
/**
* @brief IRQ 20 service routine.
*
* @isr
*/
CH_IRQ_HANDLER(20) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = sdRequestDataI(&SD2);
chSysUnlockFromIsr();
if (b < Q_OK)
UART2->CR2 &= (uint8_t)~UART2_CR2_TIEN;
else
UART2->DR = (uint8_t)b;
CH_IRQ_EPILOGUE();
}
/**
* @brief IRQ 21 service routine.
*
* @isr
*/
CH_IRQ_HANDLER(21) {
uint8_t sr = UART2->SR;
CH_IRQ_PROLOGUE();
if ((sr = UART2->SR) & (UART2_SR_OR | UART2_SR_NF |
UART2_SR_FE | UART2_SR_PE))
set_error(&SD2, sr);
chSysLockFromIsr();
sdIncomingDataI(&SD2, UART2->DR);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
#endif /* STM8S_SERIAL_USE_UART2 */
#if STM8S_SERIAL_USE_UART3 || defined(__DOXYGEN__)
/**
* @brief IRQ 20 service routine.
*
* @isr
*/
CH_IRQ_HANDLER(20) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = sdRequestDataI(&SD3);
chSysUnlockFromIsr();
if (b < Q_OK)
UART3->CR2 &= (uint8_t)~UART3_CR2_TIEN;
else
UART3->DR = (uint8_t)b;
CH_IRQ_EPILOGUE();
}
/**
* @brief IRQ 21 service routine.
*
* @isr
*/
CH_IRQ_HANDLER(21) {
uint8_t sr = UART3->SR;
CH_IRQ_PROLOGUE();
if ((sr = UART3->SR) & (UART3_SR_OR | UART3_SR_NF |
UART3_SR_FE | UART3_SR_PE))
set_error(&SD3, sr);
chSysLockFromIsr();
sdIncomingDataI(&SD3, UART3->DR);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
#endif /* STM8S_SERIAL_USE_UART3 */
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level serial driver initialization.
*
* @notapi
*/
void sd_lld_init(void) {
#if STM8S_SERIAL_USE_UART1
sdObjectInit(&SD1, NULL, notify1);
CLK->PCKENR1 |= CLK_PCKENR1_UART1; /* PCKEN12, clock source. */
UART1->CR1 = UART1_CR1_UARTD; /* UARTD (low power). */
#endif
#if STM8S_SERIAL_USE_UART2
sdObjectInit(&SD2, NULL, notify2);
CLK->PCKENR1 |= CLK_PCKENR1_UART2; /* PCKEN13, clock source. */
UART2->CR1 = UART2_CR1_UARTD; /* UARTD (low power). */
#endif
#if STM8S_SERIAL_USE_UART3
sdObjectInit(&SD3, NULL, notify3);
CLK->PCKENR1 |= CLK_PCKENR1_UART3; /* PCKEN13, clock source. */
UART3->CR1 = UART3_CR1_UARTD; /* UARTD (low power). */
#endif
}
/**
* @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 STM8S_SERIAL_USE_UART1
if (&SD1 == sdp) {
uart1_init(config);
return;
}
#endif
#if STM8S_SERIAL_USE_UART2
if (&SD2 == sdp) {
uart2_init(config);
return;
}
#endif
#if STM8S_SERIAL_USE_UART3
if (&SD3 == sdp) {
uart3_init(config);
return;
}
#endif
}
/**
* @brief Low level serial driver stop.
* @details De-initializes the USART, 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 STM8S_SERIAL_USE_UART1
if (&SD1 == sdp) {
uart1_deinit();
return;
}
#endif
#if STM8S_SERIAL_USE_UART2
if (&SD2 == sdp) {
uart2_deinit();
return;
}
#endif
#if STM8S_SERIAL_USE_UART3
if (&SD3 == sdp) {
uart3_deinit();
return;
}
#endif
}
#endif /* HAL_USE_SERIAL */
/** @} */
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