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author | Fabio Utzig <utzig@utzig.org> | 2016-03-28 20:21:08 -0300 |
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committer | Fabio Utzig <utzig@utzig.org> | 2016-03-28 20:21:08 -0300 |
commit | 778340c65318a9935a2f937ff520a32397fd07ad (patch) | |
tree | d3206875aeda84ca5d4ea42fa12dc134712d4869 /os/hal/ports/KINETIS/K20x/serial_lld.c | |
parent | c0e6748a9f9775f65a4fe2553d9ea2773d0380d8 (diff) | |
parent | c63d6a590810570aa1dfec2d07f5bac1f8d698ad (diff) | |
download | ChibiOS-Contrib-778340c65318a9935a2f937ff520a32397fd07ad.tar.gz ChibiOS-Contrib-778340c65318a9935a2f937ff520a32397fd07ad.tar.bz2 ChibiOS-Contrib-778340c65318a9935a2f937ff520a32397fd07ad.zip |
Merge pull request #45 from utzig/kinetis
[KINETIS] Move from main repo to contrib
Diffstat (limited to 'os/hal/ports/KINETIS/K20x/serial_lld.c')
-rw-r--r-- | os/hal/ports/KINETIS/K20x/serial_lld.c | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/os/hal/ports/KINETIS/K20x/serial_lld.c b/os/hal/ports/KINETIS/K20x/serial_lld.c new file mode 100644 index 0000000..0092747 --- /dev/null +++ b/os/hal/ports/KINETIS/K20x/serial_lld.c @@ -0,0 +1,327 @@ +/*
+ ChibiOS - Copyright (C) 2014-2015 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 K20x/serial_lld.c
+ * @brief Kinetis K20x Serial Driver subsystem low level driver source.
+ *
+ * @addtogroup SERIAL
+ * @{
+ */
+
+#include "osal.h"
+#include "hal.h"
+
+#if HAL_USE_SERIAL || defined(__DOXYGEN__)
+
+#include "mk20d5.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) {
+ UART_TypeDef *u = sdp->uart;
+ uint8_t s1 = u->S1;
+
+ if (s1 & UARTx_S1_RDRF) {
+ osalSysLockFromISR();
+ if (iqIsEmptyI(&sdp->iqueue))
+ chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
+ if (iqPutI(&sdp->iqueue, u->D) < Q_OK)
+ chnAddFlagsI(sdp, SD_OVERRUN_ERROR);
+ osalSysUnlockFromISR();
+ }
+
+ if (s1 & UARTx_S1_TDRE) {
+ msg_t b;
+
+ osalSysLockFromISR();
+ b = oqGetI(&sdp->oqueue);
+ osalSysUnlockFromISR();
+
+ if (b < Q_OK) {
+ osalSysLockFromISR();
+ chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
+ osalSysUnlockFromISR();
+ u->C2 &= ~UARTx_C2_TIE;
+ } else {
+ u->D = b;
+ }
+ }
+}
+
+/**
+ * @brief Attempts a TX preload
+ */
+static void preload(SerialDriver *sdp) {
+ UART_TypeDef *u = sdp->uart;
+
+ if (u->S1 & UARTx_S1_TDRE) {
+ msg_t b = oqGetI(&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(UART_TypeDef *uart, const SerialConfig *config)
+{
+ uint32_t divisor = (KINETIS_SYSCLK_FREQUENCY * 2 + 1) / config->sc_speed;
+
+ /* Disable UART while configuring */
+ uart->C2 &= ~(UARTx_C2_RE | UARTx_C2_TE);
+ uart->C1 = 0;
+
+ uart->BDH = UARTx_BDH_SBR(divisor >> 13) | (uart->BDH & ~UARTx_BDH_SBR_MASK);
+ uart->BDL = divisor >> 5;
+ uart->C4 = UARTx_C4_BRFA(divisor) | (uart->C4 & ~UARTx_C4_BRFA_MASK);
+
+ uart->C2 |= UARTx_C2_RE | UARTx_C2_RIE | UARTx_C2_TE;
+ uart->C3 = UARTx_C3_ORIE | UARTx_C3_NEIE | UARTx_C3_FEIE | UARTx_C3_PEIE;
+}
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+/* TODO:
+ * UART0_Error is Vector84
+ * UART1_Error is Vector8C
+ * UART2_Error is Vector94
+ */
+
+#if KINETIS_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+OSAL_IRQ_HANDLER(Vector80) {
+
+ OSAL_IRQ_PROLOGUE();
+ serve_interrupt(&SD1);
+ OSAL_IRQ_EPILOGUE();
+}
+#endif
+
+#if KINETIS_SERIAL_USE_UART1 || defined(__DOXYGEN__)
+OSAL_IRQ_HANDLER(Vector88) {
+
+ OSAL_IRQ_PROLOGUE();
+ serve_interrupt(&SD2);
+ OSAL_IRQ_EPILOGUE();
+}
+#endif
+
+#if KINETIS_SERIAL_USE_UART2 || defined(__DOXYGEN__)
+OSAL_IRQ_HANDLER(Vector90) {
+
+ OSAL_IRQ_PROLOGUE();
+ serve_interrupt(&SD3);
+ OSAL_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;
+ configure_uart(sdp->uart, config);
+ nvicEnableVector(UART0Status_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(UART1Status_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(UART2Status_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(UART0Status_IRQn);
+ SIM->SCGC4 &= ~SIM_SCGC4_UART0;
+ }
+#endif
+
+#if KINETIS_SERIAL_USE_UART1
+ if (sdp == &SD2) {
+ nvicDisableVector(UART1Status_IRQn);
+ SIM->SCGC4 &= ~SIM_SCGC4_UART1;
+ }
+#endif
+
+#if KINETIS_SERIAL_USE_UART2
+ if (sdp == &SD3) {
+ nvicDisableVector(UART2Status_IRQn);
+ SIM->SCGC4 &= ~SIM_SCGC4_UART2;
+ }
+#endif
+ }
+}
+
+#endif /* HAL_USE_SERIAL */
+
+/** @} */
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