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ChibiOS/os/hal/platforms/SPC5xx/ESCI_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/ESCI_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 eSCI-A serial driver identifier.
*/
#if SPC5_USE_ESCIA || defined(__DOXYGEN__)
SerialDriver SD1;
#endif
/**
* @brief eSCI-B serial driver identifier.
*/
#if SPC5_USE_ESCIB || defined(__DOXYGEN__)
SerialDriver SD2;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/**
* @brief Driver default configuration.
*/
static const SerialConfig default_config = {
SERIAL_DEFAULT_BITRATE,
SD_MODE_NORMAL | SD_MODE_PARITY_NONE
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief eSCI 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 esci_init(SerialDriver *sdp, const SerialConfig *config) {
volatile struct ESCI_tag *escip = sdp->escip;
uint8_t mode = config->sc_mode;
escip->CR2.R = 0; /* MDIS off. */
escip->CR1.R = 0;
escip->LCR.R = 0;
escip->CR1.B.SBR = SPC5_SYSCLK / (16 * config->sc_speed);
if (mode & SD_MODE_LOOPBACK)
escip->CR1.B.LOOPS = 1;
switch (mode & SD_MODE_PARITY_MASK) {
case SD_MODE_PARITY_ODD:
escip->CR1.B.PT = 1;
case SD_MODE_PARITY_EVEN:
escip->CR1.B.PE = 1;
escip->CR1.B.M = 1; /* Makes it 8 bits data + 1 bit parity. */
default:
;
}
escip->LPR.R = 0;
escip->CR1.R |= 0x0000002C; /* RIE, TE, RE to 1. */
escip->CR2.R = 0x000F; /* ORIE, NFIE, FEIE, PFIE to 1. */
}
/**
* @brief eSCI de-initialization.
* @details This function must be invoked with interrupts disabled.
*
* @param[in] escip pointer to an eSCI I/O block
*/
static void esci_deinit(volatile struct ESCI_tag *escip) {
escip->LPR.R = 0;
escip->SR.R = 0xFFFFFFFF;
escip->CR1.R = 0;
escip->CR2.R = 0x8000; /* MDIS on. */
}
/**
* @brief Error handling routine.
*
* @param[in] sdp pointer to a @p SerialDriver object
* @param[in] sr eSCI SR register value
*/
static void set_error(SerialDriver *sdp, uint32_t sr) {
flagsmask_t sts = 0;
if (sr & 0x08000000)
sts |= SD_OVERRUN_ERROR;
if (sr & 0x04000000)
sts |= SD_NOISE_ERROR;
if (sr & 0x02000000)
sts |= SD_FRAMING_ERROR;
if (sr & 0x01000000)
sts |= SD_PARITY_ERROR;
/* if (sr & 0x00000000)
sts |= SD_BREAK_DETECTED;*/
chSysLockFromIsr();
chnAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
/**
* @brief Common IRQ handler.
*
* @param[in] sdp pointer to a @p SerialDriver object
*/
static void serve_interrupt(SerialDriver *sdp) {
volatile struct ESCI_tag *escip = sdp->escip;
uint32_t sr = escip->SR.R;
escip->SR.R = 0x3FFFFFFF; /* Does not clear TDRE | TC.*/
if (sr & 0x0F000000) /* OR | NF | FE | PF. */
set_error(sdp, sr);
if (sr & 0x20000000) { /* RDRF. */
chSysLockFromIsr();
sdIncomingDataI(sdp, escip->DR.B.D);
chSysUnlockFromIsr();
}
if (escip->CR1.B.TIE && (sr & 0x80000000)) { /* TDRE. */
msg_t b;
chSysLockFromIsr();
b = chOQGetI(&sdp->oqueue);
if (b < Q_OK) {
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
escip->CR1.B.TIE = 0;
}
else {
ESCI_A.SR.B.TDRE = 1;
escip->DR.R = (uint16_t)b;
}
chSysUnlockFromIsr();
}
}
#if SPC5_USE_ESCIA || defined(__DOXYGEN__)
static void notify1(GenericQueue *qp) {
(void)qp;
if (ESCI_A.SR.B.TDRE) {
msg_t b = sdRequestDataI(&SD1);
if (b != Q_EMPTY) {
ESCI_A.SR.B.TDRE = 1;
ESCI_A.CR1.B.TIE = 1;
ESCI_A.DR.R = (uint16_t)b;
}
}
}
#endif
#if SPC5_USE_ESCIB || defined(__DOXYGEN__)
static void notify2(GenericQueue *qp) {
(void)qp;
if (ESCI_B.SR.B.TDRE) {
msg_t b = sdRequestDataI(&SD2);
if (b != Q_EMPTY) {
ESCI_B.SR.B.TDRE = 1;
ESCI_B.CR1.B.TIE = 1;
ESCI_B.DR.R = (uint16_t)b;
}
}
}
#endif
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if SPC5_USE_ESCIA || defined(__DOXYGEN__)
#if !defined(SPC5_ESCIA_HANDLER)
#error "SPC5_ESCIA_HANDLER not defined"
#endif
/**
* @brief eSCI-A interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(SPC5_ESCIA_HANDLER) {
CH_IRQ_PROLOGUE();
serve_interrupt(&SD1);
CH_IRQ_EPILOGUE();
}
#endif
#if SPC5_USE_ESCIB || defined(__DOXYGEN__)
#if !defined(SPC5_ESCIB_HANDLER)
#error "SPC5_ESCIB_HANDLER not defined"
#endif
/**
* @brief eSCI-B interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(SPC5_ESCIB_HANDLER) {
CH_IRQ_PROLOGUE();
serve_interrupt(&SD2);
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level serial driver initialization.
*
* @notapi
*/
void sd_lld_init(void) {
#if SPC5_USE_ESCIA
sdObjectInit(&SD1, NULL, notify1);
SD1.escip = &ESCI_A;
ESCI_A.CR2.R = 0x8000; /* MDIS ON. */
INTC.PSR[SPC5_ESCIA_NUMBER].R = SPC5_ESCIA_PRIORITY;
#endif
#if SPC5_USE_ESCIB
sdObjectInit(&SD2, NULL, notify2);
SD2.escip = &ESCI_B;
ESCI_B.CR2.R = 0x8000; /* MDIS ON. */
INTC.PSR[SPC5_ESCIB_NUMBER].R = SPC5_ESCIB_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;
esci_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)
esci_deinit(sdp->escip);
}
#endif /* HAL_USE_SERIAL */
/** @} */
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