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tinySA/os/hal/ports/KINETIS/KL2x/serial_lld.c

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/*
ChibiOS - Copyright (C) 2013..2015 Fabio Utzig
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 KL2x/serial_lld.c
* @brief Kinetis KL2x Serial Driver subsystem low level driver source.
*
* @addtogroup SERIAL
* @{
*/
#include "osal.h"
#include "hal.h"
#if HAL_USE_SERIAL || defined(__DOXYGEN__)
#include "kl25z.h"
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief SD1 driver identifier.
*/
#if KINETIS_SERIAL_USE_UART0 || defined(__DOXYGEN__)
SerialDriver SD1;
#endif
#if KINETIS_SERIAL_USE_UART1 || defined(__DOXYGEN__)
SerialDriver SD2;
#endif
#if KINETIS_SERIAL_USE_UART2 || defined(__DOXYGEN__)
SerialDriver SD3;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/**
* @brief Driver default configuration.
*/
static const SerialConfig default_config = {
38400
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Common IRQ handler.
* @note Tries hard to clear all the pending interrupt sources, we don't
* want to go through the whole ISR and have another interrupt soon
* after.
*
* @param[in] u pointer to an UART I/O block
* @param[in] sdp communication channel associated to the UART
*/
static void serve_interrupt(SerialDriver *sdp) {
UARTLP_TypeDef *u = sdp->uart;
if (u->S1 & UARTx_S1_RDRF) {
osalSysLockFromISR();
if (chIQIsEmptyI(&sdp->iqueue))
chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
if (chIQPutI(&sdp->iqueue, u->D) < Q_OK)
chnAddFlagsI(sdp, SD_OVERRUN_ERROR);
osalSysUnlockFromISR();
}
if (u->S1 & UARTx_S1_TDRE) {
msg_t b;
osalSysLockFromISR();
b = chOQGetI(&sdp->oqueue);
osalSysUnlockFromISR();
if (b < Q_OK) {
osalSysLockFromISR();
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
osalSysUnlockFromISR();
u->C2 &= ~UARTx_C2_TIE;
} else {
u->D = b;
}
}
if (u->S1 & UARTx_S1_IDLE)
u->S1 = UARTx_S1_IDLE; // Clear IDLE (S1 bits are write-1-to-clear).
if (u->S1 & (UARTx_S1_OR | UARTx_S1_NF | UARTx_S1_FE | UARTx_S1_PF)) {
// FIXME: need to add set_error()
// Clear flags (S1 bits are write-1-to-clear).
u->S1 = UARTx_S1_OR | UARTx_S1_NF | UARTx_S1_FE | UARTx_S1_PF;
}
}
/**
* @brief Attempts a TX preload
*/
static void preload(SerialDriver *sdp) {
UARTLP_TypeDef *u = sdp->uart;
if (u->S1 & UARTx_S1_TDRE) {
msg_t b = chOQGetI(&sdp->oqueue);
if (b < Q_OK) {
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
return;
}
u->D = b;
u->C2 |= UARTx_C2_TIE;
}
}
/**
* @brief Driver output notification.
*/
#if KINETIS_SERIAL_USE_UART0 || defined(__DOXYGEN__)
static void notify1(io_queue_t *qp)
{
(void)qp;
preload(&SD1);
}
#endif
#if KINETIS_SERIAL_USE_UART1 || defined(__DOXYGEN__)
static void notify2(io_queue_t *qp)
{
(void)qp;
preload(&SD2);
}
#endif
#if KINETIS_SERIAL_USE_UART2 || defined(__DOXYGEN__)
static void notify3(io_queue_t *qp)
{
(void)qp;
preload(&SD3);
}
#endif
/**
* @brief Common UART configuration.
*
*/
static void configure_uart(UARTLP_TypeDef *uart, const SerialConfig *config)
{
uint32_t uart_clock;
uart->C1 = 0;
uart->C3 = UARTx_C3_ORIE | UARTx_C3_NEIE | UARTx_C3_FEIE | UARTx_C3_PEIE;
uart->S1 = UARTx_S1_IDLE | UARTx_S1_OR | UARTx_S1_NF | UARTx_S1_FE | UARTx_S1_PF;
while (uart->S1 & UARTx_S1_RDRF) {
(void)uart->D;
}
#if KINETIS_SERIAL_USE_UART0
if (uart == UART0) {
/* UART0 can be clocked from several sources. */
uart_clock = KINETIS_UART0_CLOCK_FREQ;
}
#endif
#if KINETIS_SERIAL_USE_UART1
if (uart == UART1) {
uart_clock = KINETIS_BUSCLK_FREQUENCY;
}
#endif
#if KINETIS_SERIAL_USE_UART2
if (uart == UART2) {
uart_clock = KINETIS_BUSCLK_FREQUENCY;
}
#endif
/* FIXME: change fixed OSR = 16 to dynamic value based on baud */
uint16_t divisor = (uart_clock / 16) / config->sc_speed;
uart->C4 = UARTx_C4_OSR & (16 - 1);
uart->BDH = (divisor >> 8) & UARTx_BDH_SBR;
uart->BDL = (divisor & UARTx_BDL_SBR);
uart->C2 = UARTx_C2_RE | UARTx_C2_RIE | UARTx_C2_TE;
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if KINETIS_SERIAL_USE_UART0 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(Vector70) {
CH_IRQ_PROLOGUE();
serve_interrupt(&SD1);
CH_IRQ_EPILOGUE();
}
#endif
#if KINETIS_SERIAL_USE_UART1 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(Vector74) {
CH_IRQ_PROLOGUE();
serve_interrupt(&SD2);
CH_IRQ_EPILOGUE();
}
#endif
#if KINETIS_SERIAL_USE_UART2 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(Vector78) {
CH_IRQ_PROLOGUE();
serve_interrupt(&SD3);
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level serial driver initialization.
*
* @notapi
*/
void sd_lld_init(void) {
#if KINETIS_SERIAL_USE_UART0
/* Driver initialization.*/
sdObjectInit(&SD1, NULL, notify1);
SD1.uart = UART0;
#endif
#if KINETIS_SERIAL_USE_UART1
/* Driver initialization.*/
sdObjectInit(&SD2, NULL, notify2);
SD2.uart = UART1;
#endif
#if KINETIS_SERIAL_USE_UART2
/* Driver initialization.*/
sdObjectInit(&SD3, NULL, notify3);
SD3.uart = UART2;
#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) {
/* Enables the peripheral.*/
#if KINETIS_SERIAL_USE_UART0
if (sdp == &SD1) {
SIM->SCGC4 |= SIM_SCGC4_UART0;
SIM->SOPT2 =
(SIM->SOPT2 & ~SIM_SOPT2_UART0SRC_MASK) |
SIM_SOPT2_UART0SRC(KINETIS_UART0_CLOCK_SRC);
configure_uart(sdp->uart, config);
nvicEnableVector(UART0_IRQn, KINETIS_SERIAL_UART0_PRIORITY);
}
#endif /* KINETIS_SERIAL_USE_UART0 */
#if KINETIS_SERIAL_USE_UART1
if (sdp == &SD2) {
SIM->SCGC4 |= SIM_SCGC4_UART1;
configure_uart(sdp->uart, config);
nvicEnableVector(UART1_IRQn, KINETIS_SERIAL_UART1_PRIORITY);
}
#endif /* KINETIS_SERIAL_USE_UART1 */
#if KINETIS_SERIAL_USE_UART2
if (sdp == &SD3) {
SIM->SCGC4 |= SIM_SCGC4_UART2;
configure_uart(sdp->uart, config);
nvicEnableVector(UART2_IRQn, KINETIS_SERIAL_UART2_PRIORITY);
}
#endif /* KINETIS_SERIAL_USE_UART2 */
}
/* Configures the peripheral.*/
}
/**
* @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 (sdp->state == SD_READY) {
/* TODO: Resets the peripheral.*/
#if KINETIS_SERIAL_USE_UART0
if (sdp == &SD1) {
nvicDisableVector(UART0_IRQn);
SIM->SCGC4 &= ~SIM_SCGC4_UART0;
}
#endif
#if KINETIS_SERIAL_USE_UART1
if (sdp == &SD2) {
nvicDisableVector(UART1_IRQn);
SIM->SCGC4 &= ~SIM_SCGC4_UART1;
}
#endif
#if KINETIS_SERIAL_USE_UART2
if (sdp == &SD3) {
nvicDisableVector(UART2_IRQn);
SIM->SCGC4 &= ~SIM_SCGC4_UART2;
}
#endif
}
}
#endif /* HAL_USE_SERIAL */
/** @} */
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