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

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/*
* Licensed under ST Liberty SW License Agreement V2, (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.st.com/software_license_agreement_liberty_v2
*
* 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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