diff options
Diffstat (limited to 'os/hal/platforms/Rx62n/serial_lld.c')
| -rw-r--r-- | os/hal/platforms/Rx62n/serial_lld.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/os/hal/platforms/Rx62n/serial_lld.c b/os/hal/platforms/Rx62n/serial_lld.c new file mode 100644 index 000000000..fc0e5eca2 --- /dev/null +++ b/os/hal/platforms/Rx62n/serial_lld.c @@ -0,0 +1,306 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+ 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 RX62N/serial_lld.c
+ * @brief RX62N low level serial driver code.
+ *
+ * @addtogroup SERIAL
+ * @{
+ */
+
+#include "ch.h"
+#include "hal.h"
+
+#if HAL_USE_SERIAL || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+#if RX62N_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+/** @brief UART0 serial driver identifier.*/
+SerialDriver SD1;
+#endif
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/** @brief Driver default configuration.*/
+static const SerialConfig default_config = {
+ .sc_speed = SERIAL_DEFAULT_BITRATE,
+ .sc_scr = 0, /* only bits 0-1 used */
+ .sc_smr = 0,
+ .sc_semr = 0,
+};
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/**
+ * @brief UART initialization.
+ *
+ * @param[in] sdp communication channel associated to the UART
+ * @param[in] config the architecture-dependent serial driver configuration
+ * @todo Test all possible SMR and SEMR clock settings
+ */
+static void uart_init(SerialDriver *sdp, const SerialConfig *config) {
+ volatile struct st_sci *u = sdp->uart;
+
+ uint32_t brr;
+
+ u->SCR.BYTE = config->sc_scr & 0x03;
+ u->SMR.BYTE = config->sc_smr;
+ u->SEMR.BYTE = config->sc_semr;
+ brr = ( 32 << ( 2 * ( config->sc_smr & 3 ) ) ) >> ( ( config->sc_semr & 0x10 ) ? 1 : 0 );
+ brr = RX62N_PERCLK / ( brr * config->sc_speed ) - 1;
+ u->BRR = brr;
+ /* TODO: delay 1-bit interval */
+ u->SCR.BYTE |= 0x70;
+}
+
+/**
+ * @brief UART de-initialization.
+ *
+ * @param[in] u pointer to an UART I/O block
+ */
+static void uart_deinit(volatile struct st_sci *u) {
+
+ u->SCR.BYTE = 0;
+ u->SMR.BYTE = 0;
+ u->SEMR.BYTE = 0;
+ u->BRR = 0;
+}
+
+/**
+ * @brief Error handling routine.
+ *
+ * @param[in] sdp communication channel associated to the UART
+ * @param[in] err UART LSR register value
+ */
+static void set_error(SerialDriver *sdp, uint32_t err) {
+
+ flagsmask_t sts = 0;
+
+ if (err & SSR_ORER)
+ sts |= SD_OVERRUN_ERROR;
+ if (err & SSR_PER)
+ sts |= SD_PARITY_ERROR;
+ if (err & SSR_FER)
+ sts |= SD_FRAMING_ERROR;
+ chSysLockFromIsr();
+ chnAddFlagsI(sdp, sts);
+ chSysUnlockFromIsr();
+
+}
+
+#if RX62N_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+/**
+ * @brief Error IRQ handler.
+ *
+ * @param[in] sdp communication channel associated to the UART
+ */
+static void serve_interrupt_eri(SerialDriver *sdp) {
+ volatile struct st_sci *u = sdp->uart;
+
+ set_error(sdp, u->SSR.BYTE);
+ u->SSR.BYTE &= ~((1<<3)|(1<<4)|(1<<5)); /* clear error flags */
+}
+
+/**
+ * @brief Receive IRQ handler.
+ *
+ * @param[in] sdp communication channel associated to the UART
+ */
+static void serve_interrupt_rxi(SerialDriver *sdp) {
+ volatile struct st_sci *u = sdp->uart;
+
+ chSysLockFromIsr();
+ sdIncomingDataI(sdp, u->RDR);
+ chSysUnlockFromIsr();
+}
+
+/**
+ * @brief Transmit IRQ handler.
+ *
+ * @param[in] sdp communication channel associated to the UART
+ */
+static void serve_interrupt_txi(SerialDriver *sdp) {
+ volatile struct st_sci *u = sdp->uart;
+ msg_t b;
+
+ chSysLockFromIsr();
+ if (!u->SSR.BIT.TDRE) {
+ /* forced by notify */
+ chSysUnlockFromIsr();
+ return;
+ }
+ b = chOQGetI(&sdp->oqueue);
+ chSysUnlockFromIsr();
+ if (b < Q_OK) {
+ u->SCR.BIT.TIE = 0;
+ chSysLockFromIsr();
+ chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
+ chSysUnlockFromIsr();
+ return;
+ }
+ u->TDR = b;
+}
+
+/**
+ * @brief Transmission end IRQ handler.
+ *
+ * @param[in] sdp communication channel associated to the UART
+ */
+static void serve_interrupt_tei(SerialDriver *sdp) {
+
+ chSysLockFromIsr();
+ chnAddFlagsI(sdp, CHN_TRANSMISSION_END);
+ chSysUnlockFromIsr();
+}
+
+/**
+ * @brief Driver SD1 output notification.
+ */
+static void notify1(GenericQueue *qp) {
+
+ (void)qp;
+ SD1.uart->SCR.BIT.TIE = 1;
+ IR(SCI0,TXI0) = 1; /* Set Interrupt Enable Register */
+}
+#endif
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+/**
+ * @brief UART0 IRQ handler.
+ *
+ * @isr
+ */
+#if RX62N_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(Excep_SCI0_ERI0) {
+
+ CH_IRQ_PROLOGUE();
+
+ serve_interrupt_eri(&SD1);
+
+ CH_IRQ_EPILOGUE();
+}
+CH_IRQ_HANDLER(Excep_SCI0_RXI0) {
+
+ CH_IRQ_PROLOGUE();
+
+ serve_interrupt_rxi(&SD1);
+
+ CH_IRQ_EPILOGUE();
+}
+CH_IRQ_HANDLER(Excep_SCI0_TXI0) {
+
+ CH_IRQ_PROLOGUE();
+
+ serve_interrupt_txi(&SD1);
+
+ CH_IRQ_EPILOGUE();
+}
+CH_IRQ_HANDLER(Excep_SCI0_TEI0) {
+
+ CH_IRQ_PROLOGUE();
+
+ serve_interrupt_tei(&SD1);
+
+ CH_IRQ_EPILOGUE();
+}
+#endif
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Low level serial driver initialization.
+ *
+ * @notapi
+ */
+void sd_lld_init(void) {
+
+#if RX62N_SERIAL_USE_UART0
+ sdObjectInit(&SD1, NULL, notify1);
+ SD1.uart = &SCI0;
+ PORT2.ICR.BIT.B1 = 1;
+#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 RX62N_SERIAL_USE_UART0
+ if (&SD1 == sdp) {
+ MSTP(SCI0) = 0; /* Enable SCI0 (cancel module stop state) */
+ IEN(SCI0,RXI0) = 1;
+ IEN(SCI0,TXI0) = 1;
+ IEN(SCI0,ERI0) = 1;
+ IPR(SCI0,TXI0) = RX62N_SERIAL_UART0_IRQ_PRIORITY;
+ }
+#endif
+ }
+ uart_init(sdp, config);
+}
+
+/**
+ * @brief Low level serial driver stop.
+ * @details De-initializes the UART, 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) {
+ uart_deinit(sdp->uart);
+#if RX62N_SERIAL_USE_UART0
+ if (&SD1 == sdp) {
+ IEN(SCI0,RXI0) = 0;
+ IEN(SCI0,TXI0) = 0;
+ IEN(SCI0,ERI0) = 0;
+ MSTP(SCI0) = 1; /* Disable SCI0 (enter module stop state) */
+ return;
+ }
+#endif
+ }
+}
+
+#endif /* HAL_USE_SERIAL */
+
+/** @} */
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