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tinySA/os/hal/platforms/SPC5xx/LINFlex_v1/serial_lld.c

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/*
SPC5 HAL - Copyright (C) 2013 STMicroelectronics
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 SPC5xx/LINFlex_v1/serial_lld.c
* @brief SPC5xx low level serial driver code.
*
* @addtogroup SERIAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_SERIAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief LIINFlex-0 serial driver identifier.
*/
#if SPC5_SERIAL_USE_LINFLEX0 || defined(__DOXYGEN__)
SerialDriver SD1;
#endif
/**
* @brief LIINFlex-1 serial driver identifier.
*/
#if SPC5_SERIAL_USE_LINFLEX1 || defined(__DOXYGEN__)
SerialDriver SD2;
#endif
/**
* @brief LIINFlex-2 serial driver identifier.
*/
#if SPC5_SERIAL_USE_LINFLEX2 || defined(__DOXYGEN__)
SerialDriver SD3;
#endif
/**
* @brief LIINFlex-3 serial driver identifier.
*/
#if SPC5_SERIAL_USE_LINFLEX3 || defined(__DOXYGEN__)
SerialDriver SD4;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/**
* @brief Driver default configuration.
*/
static const SerialConfig default_config = {
SERIAL_DEFAULT_BITRATE,
SD_MODE_8BITS_PARITY_NONE
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief LINFlex initialization.
* @details This function must be invoked with interrupts disabled.
*
* @param[in] sdp pointer to a @p SerialDriver object
* @param[in] config the architecture-dependent serial driver configuration
*/
static void spc5_linflex_init(SerialDriver *sdp, const SerialConfig *config) {
uint32_t div;
volatile struct LINFLEX_tag *linflexp = sdp->linflexp;
/* Enters the configuration mode.*/
linflexp->LINCR1.R = 1; /* INIT bit. */
/* Configures the LINFlex in UART mode with all the required
parameters.*/
linflexp->UARTCR.R = SPC5_UARTCR_UART; /* UART mode FIRST. */
linflexp->UARTCR.R = SPC5_UARTCR_UART | SPC5_UARTCR_RXEN | config->mode;
div = SPC5_LINFLEX0_CLK / config->speed;
linflexp->LINFBRR.R = (uint16_t)(div & 15); /* Fractional divider. */
linflexp->LINIBRR.R = (uint16_t)(div >> 4); /* Integer divider. */
linflexp->UARTSR.R = 0xFFFF; /* Clearing UARTSR register.*/
linflexp->LINIER.R = SPC5_LINIER_DTIE | SPC5_LINIER_DRIE |
SPC5_LINIER_BOIE | SPC5_LINIER_FEIE |
SPC5_LINIER_SZIE; /* Interrupts enabled. */
/* Leaves the configuration mode.*/
linflexp->LINCR1.R = 0;
}
/**
* @brief LINFlex de-initialization.
* @details This function must be invoked with interrupts disabled.
*
* @param[in] linflexp pointer to a LINFlex I/O block
*/
static void spc5_linflex_deinit(volatile struct LINFLEX_tag *linflexp) {
/* Enters the configuration mode.*/
linflexp->LINCR1.R = 1; /* INIT bit. */
/* Resets the LINFlex registers.*/
linflexp->LINFBRR.R = 0; /* Fractional divider. */
linflexp->LINIBRR.R = 0; /* Integer divider. */
linflexp->UARTSR.R = 0xFFFF; /* Clearing UARTSR register.*/
linflexp->UARTCR.R = SPC5_UARTCR_UART;
linflexp->LINIER.R = 0; /* Interrupts disabled. */
/* Leaves the configuration mode.*/
linflexp->LINCR1.R = 0;
}
/**
* @brief Common RXI IRQ handler.
*
* @param[in] sdp pointer to a @p SerialDriver object
*/
static void spc5xx_serve_rxi_interrupt(SerialDriver *sdp) {
flagsmask_t sts = 0;
uint16_t sr = sdp->linflexp->UARTSR.R;
sdp->linflexp->UARTSR.R = SPC5_UARTSR_NF | SPC5_UARTSR_DRF |
SPC5_UARTSR_PE0;
if (sr & SPC5_UARTSR_NF)
sts |= SD_NOISE_ERROR;
if (sr & SPC5_UARTSR_PE0)
sts |= SD_PARITY_ERROR;
if (sts) {
chSysLockFromIsr();
chnAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
if (sr & SPC5_UARTSR_DRF) {
sdIncomingDataI(sdp, sdp->linflexp->BDRM.B.DATA4);
sdp->linflexp->UARTSR.R = SPC5_UARTSR_RMB;
}
}
/**
* @brief Common TXI IRQ handler.
*
* @param[in] sdp pointer to a @p SerialDriver object
*/
static void spc5xx_serve_txi_interrupt(SerialDriver *sdp) {
msg_t b;
sdp->linflexp->UARTSR.R = SPC5_UARTSR_DTF;
b = chOQGetI(&sdp->oqueue);
if (b < Q_OK) {
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
sdp->linflexp->UARTCR.B.TXEN = 0;
}
else
sdp->linflexp->BDRL.B.DATA0 = b;
}
/**
* @brief Common ERR IRQ handler.
*
* @param[in] sdp pointer to a @p SerialDriver object
*/
static void spc5xx_serve_err_interrupt(SerialDriver *sdp) {
flagsmask_t sts = 0;
uint16_t sr = sdp->linflexp->UARTSR.R;
sdp->linflexp->UARTSR.R = SPC5_UARTSR_BOF | SPC5_UARTSR_FEF |
SPC5_UARTSR_SZF;
if (sr & SPC5_UARTSR_BOF)
sts |= SD_OVERRUN_ERROR;
if (sr & SPC5_UARTSR_FEF)
sts |= SD_FRAMING_ERROR;
if (sr & SPC5_UARTSR_SZF)
sts |= SD_BREAK_DETECTED;
chSysLockFromIsr();
chnAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
#if SPC5_SERIAL_USE_LINFLEX0 || defined(__DOXYGEN__)
static void notify1(GenericQueue *qp) {
(void)qp;
if (!SD1.linflexp->UARTCR.B.TXEN) {
msg_t b = sdRequestDataI(&SD1);
if (b != Q_EMPTY) {
SD1.linflexp->UARTCR.B.TXEN = 1;
SD1.linflexp->BDRL.B.DATA0 = b;
}
}
}
#endif
#if SPC5_SERIAL_USE_LINFLEX1 || defined(__DOXYGEN__)
static void notify2(GenericQueue *qp) {
(void)qp;
if (!SD2.linflexp->UARTCR.B.TXEN) {
msg_t b = sdRequestDataI(&SD2);
if (b != Q_EMPTY) {
SD2.linflexp->UARTCR.B.TXEN = 1;
SD2.linflexp->BDRL.B.DATA0 = b;
}
}
}
#endif
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if SPC5_SERIAL_USE_LINFLEX0 || defined(__DOXYGEN__)
#if !defined(SPC5_LINFLEX0_RXI_HANDLER)
#error "SPC5_LINFLEX0_RXI_HANDLER not defined"
#endif
/**
* @brief LINFlex-0 RXI interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(SPC5_LINFLEX0_RXI_HANDLER) {
CH_IRQ_PROLOGUE();
spc5xx_serve_rxi_interrupt(&SD1);
CH_IRQ_EPILOGUE();
}
#if !defined(SPC5_LINFLEX0_TXI_HANDLER)
#error "SPC5_LINFLEX0_TXI_HANDLER not defined"
#endif
/**
* @brief LINFlex-0 TXI interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(SPC5_LINFLEX0_TXI_HANDLER) {
CH_IRQ_PROLOGUE();
spc5xx_serve_txi_interrupt(&SD1);
CH_IRQ_EPILOGUE();
}
#if !defined(SPC5_LINFLEX0_ERR_HANDLER)
#error "SPC5_LINFLEX0_ERR_HANDLER not defined"
#endif
/**
* @brief LINFlex-0 ERR interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(SPC5_LINFLEX0_ERR_HANDLER) {
CH_IRQ_PROLOGUE();
spc5xx_serve_err_interrupt(&SD1);
CH_IRQ_EPILOGUE();
}
#endif
#if SPC5_SERIAL_USE_LINFLEX1 || defined(__DOXYGEN__)
#if !defined(SPC5_LINFLEX1_RXI_HANDLER)
#error "SPC5_LINFLEX1_RXI_HANDLER not defined"
#endif
/**
* @brief LINFlex-1 RXI interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(SPC5_LINFLEX1_RXI_HANDLER) {
CH_IRQ_PROLOGUE();
spc5xx_serve_rxi_interrupt(&SD2);
CH_IRQ_EPILOGUE();
}
#if !defined(SPC5_LINFLEX1_TXI_HANDLER)
#error "SPC5_LINFLEX1_TXI_HANDLER not defined"
#endif
/**
* @brief LINFlex-1 TXI interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(SPC5_LINFLEX1_TXI_HANDLER) {
CH_IRQ_PROLOGUE();
spc5xx_serve_txi_interrupt(&SD2);
CH_IRQ_EPILOGUE();
}
#if !defined(SPC5_LINFLEX1_ERR_HANDLER)
#error "SPC5_LINFLEX1_ERR_HANDLER not defined"
#endif
/**
* @brief LINFlex-1 ERR interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(SPC5_LINFLEX1_ERR_HANDLER) {
CH_IRQ_PROLOGUE();
spc5xx_serve_err_interrupt(&SD2);
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level serial driver initialization.
*
* @notapi
*/
void sd_lld_init(void) {
#if SPC5_SERIAL_USE_LINFLEX0
sdObjectInit(&SD1, NULL, notify1);
SD1.linflexp = &LINFLEX_0;
INTC.PSR[SPC5_LINFLEX0_RXI_NUMBER].R = SPC5_SERIAL_LINFLEX0_PRIORITY;
INTC.PSR[SPC5_LINFLEX0_TXI_NUMBER].R = SPC5_SERIAL_LINFLEX0_PRIORITY;
INTC.PSR[SPC5_LINFLEX0_ERR_NUMBER].R = SPC5_SERIAL_LINFLEX0_PRIORITY;
#endif
#if SPC5_SERIAL_USE_LINFLEX1
sdObjectInit(&SD2, NULL, notify2);
SD2.linflexp = &LINFLEX_1;
INTC.PSR[SPC5_LINFLEX1_RXI_NUMBER].R = SPC5_SERIAL_LINFLEX1_PRIORITY;
INTC.PSR[SPC5_LINFLEX1_TXI_NUMBER].R = SPC5_SERIAL_LINFLEX1_PRIORITY;
INTC.PSR[SPC5_LINFLEX1_ERR_NUMBER].R = SPC5_SERIAL_LINFLEX1_PRIORITY;
#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 (sdp->state == SD_STOP) {
#if SPC5_SERIAL_USE_LINFLEX0
if (&SD1 == sdp) {
halSPCSetPeripheralClockMode(SPC5_LINFLEX0_PCTL,
SPC5_SERIAL_LINFLEX0_START_PCTL);
}
#endif
#if SPC5_SERIAL_USE_LINFLEX1
if (&SD2 == sdp) {
halSPCSetPeripheralClockMode(SPC5_LINFLEX1_PCTL,
SPC5_SERIAL_LINFLEX1_START_PCTL);
}
#endif
}
spc5_linflex_init(sdp, config);
}
/**
* @brief Low level serial driver stop.
*
* @param[in] sdp pointer to a @p SerialDriver object
*
* @notapi
*/
void sd_lld_stop(SerialDriver *sdp) {
if (sdp->state == SD_READY) {
spc5_linflex_deinit(sdp->linflexp);
#if SPC5_SERIAL_USE_LINFLEX0
if (&SD1 == sdp) {
halSPCSetPeripheralClockMode(SPC5_LINFLEX0_PCTL,
SPC5_SERIAL_LINFLEX0_STOP_PCTL);
return;
}
#endif
#if SPC5_SERIAL_USE_LINFLEX1
if (&SD2 == sdp) {
halSPCSetPeripheralClockMode(SPC5_LINFLEX1_PCTL,
SPC5_SERIAL_LINFLEX1_STOP_PCTL);
return;
}
#endif
}
}
#endif /* HAL_USE_SERIAL */
/** @} */
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