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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 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 STM8L/serial_lld.c
* @brief STM8L low level serial driver code.
*
* @addtogroup SERIAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_SERIAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief USART1 serial driver identifier.
*/
#if STM8L_SERIAL_USE_USART1 || defined(__DOXYGEN__)
SerialDriver SD1;
#endif
/**
* @brief USART2 serial driver identifier.
*/
#if STM8L_SERIAL_USE_USART2 || defined(__DOXYGEN__)
SerialDriver SD2;
#endif
/**
* @brief USART3 serial driver identifier.
*/
#if STM8L_SERIAL_USE_USART3 || defined(__DOXYGEN__)
SerialDriver SD3;
#endif
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/**
* @brief Driver default configuration.
*/
static ROMCONST SerialConfig default_config = {
BRR(SERIAL_DEFAULT_BITRATE),
SD_MODE_PARITY_NONE | SD_MODE_STOP_1
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
#if STM8L_SERIAL_USE_USART1 || defined(__DOXYGEN__)
static void notify1(GenericQueue *qp) {
(void)qp;
USART1->CR2 |= USART_CR2_TIEN;
}
#endif /* STM8L_SERIAL_USE_USART1 */
#if STM8L_SERIAL_USE_USART2 || defined(__DOXYGEN__)
static void notify2(GenericQueue *qp) {
(void)qp;
USART2->CR2 |= USART_CR2_TIEN;
}
#endif /* STM8L_SERIAL_USE_USART1 */
#if STM8L_SERIAL_USE_USART3 || defined(__DOXYGEN__)
static void notify3(GenericQueue *qp) {
(void)qp;
USART3->CR2 |= USART_CR2_TIEN;
}
#endif /* STM8L_SERIAL_USE_USART3 */
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/* See in serial_lld.h.*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Error handling routine.
*
* @param[in] sdp pointer to a @p SerialDriver object
* @param[in] sr USART SR register value
*
* @notapi
*/
void sd_lld_set_error(SerialDriver *sdp, uint8_t sr) {
ioflags_t sts = 0;
if (sr & USART_SR_OR)
sts |= SD_OVERRUN_ERROR;
if (sr & USART_SR_NF)
sts |= SD_NOISE_ERROR;
if (sr & USART_SR_FE)
sts |= SD_FRAMING_ERROR;
if (sr & USART_SR_PE)
sts |= SD_PARITY_ERROR;
chSysLockFromIsr();
chIOAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
/**
* @brief Low level serial driver initialization.
*
* @notapi
*/
void sd_lld_init(void) {
#if STM8L_SERIAL_USE_USART1
sdObjectInit(&SD1, NULL, notify1);
CLK->PCKENR1 |= CLK_PCKENR1_USART1; /* PCKEN12, clock source. */
USART1->CR1 = USART_CR1_USARTD; /* USARTD (low power). */
SD1.usart = USART1;
#endif
#if STM8L_SERIAL_USE_USART2
sdObjectInit(&SD2, NULL, notify2);
CLK->PCKENR3 |= CLK_PCKENR3_USART2; /* PCKEN13, clock source. */
USART2->CR1 = USART_CR1_USARTD; /* USARTD (low power). */
SD2.usart = USART2;
#endif
#if STM8L_SERIAL_USE_USART3
sdObjectInit(&SD3, NULL, notify3);
CLK->PCKENR3 |= CLK_PCKENR3_USART3; /* PCKEN13, clock source. */
USART3->CR1 = USART_CR1_USARTD; /* USARTD (low power). */
SD3.usart = USART3;
#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) {
USART_TypeDef *u = sdp->usart;
if (config == NULL)
config = &default_config;
u->BRR2 = (uint8_t)(((uint8_t)(config->sc_brr >> 8) & (uint8_t)0xF0) |
((uint8_t)config->sc_brr & (uint8_t)0x0F));
u->BRR1 = (uint8_t)(config->sc_brr >> 4);
u->CR1 = (uint8_t)(config->sc_mode & SD_MODE_PARITY);
u->CR2 = USART_CR2_RIEN | USART_CR2_TEN | USART_CR2_REN;
u->CR3 = (uint8_t)(config->sc_mode & SD_MODE_STOP);
u->CR4 = 0;
u->CR5 = 0;
u->PSCR = 1;
(void)u->SR;
(void)u->DR;
}
/**
* @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) {
USART_TypeDef *u = sdp->usart;
u->CR1 = USART_CR1_USARTD;
u->CR2 = 0;
u->CR3 = 0;
u->CR4 = 0;
u->CR5 = 0;
u->PSCR = 0;
}
#endif /* HAL_USE_SERIAL */
/** @} */
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