diff options
Diffstat (limited to 'os/hal/platforms/LPC8xx/serial_lld.c')
| -rw-r--r-- | os/hal/platforms/LPC8xx/serial_lld.c | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/os/hal/platforms/LPC8xx/serial_lld.c b/os/hal/platforms/LPC8xx/serial_lld.c new file mode 100644 index 000000000..e9b53dc72 --- /dev/null +++ b/os/hal/platforms/LPC8xx/serial_lld.c @@ -0,0 +1,352 @@ +/*
+ 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 LPC8xx/serial_lld.c
+ * @brief LPC8xx low level serial driver code.
+ *
+ * @addtogroup SERIAL
+ * @{
+ */
+
+#include "ch.h"
+#include "hal.h"
+
+#if HAL_USE_SERIAL || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+#if LPC8xx_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+/** @brief UART0 serial driver identifier.*/
+SerialDriver SD1;
+#endif
+
+#if LPC8xx_SERIAL_USE_UART1 || defined(__DOXYGEN__)
+/** @brief UART1 serial driver identifier.*/
+SerialDriver SD2;
+#endif
+
+#if LPC8xx_SERIAL_USE_UART2 || defined(__DOXYGEN__)
+/** @brief UART2 serial driver identifier.*/
+SerialDriver SD3;
+#endif
+
+/*===========================================================================*/
+/* Driver local variables. */
+/*===========================================================================*/
+
+/** @brief Driver default configuration.*/
+static const SerialConfig default_config = {
+ SERIAL_DEFAULT_BITRATE,
+ (CFG_DL8 | CFG_NOPARITY | CFG_STOP1)
+};
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Error handling routine.
+ *
+ * @param[in] sdp communication channel associated to the UART
+ * @param[in] err UART STAT register value
+ */
+static void set_error(SerialDriver *sdp, IOREG32 err) {
+ flagsmask_t sts = 0;
+
+ if (err & STAT_OVERRUN)
+ sts |= SD_OVERRUN_ERROR;
+ if (err & STAT_PARITYERR)
+ sts |= SD_PARITY_ERROR;
+ if (err & STAT_FRAMERR)
+ sts |= SD_FRAMING_ERROR;
+ if (err & STAT_RXBRK)
+ sts |= SD_BREAK_DETECTED;
+
+ chSysLockFromIsr();
+ chnAddFlagsI(sdp, sts);
+ chSysUnlockFromIsr();
+}
+
+/**
+ * @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) {
+ LPC_USART_TypeDef *u = sdp->uart;
+
+ while (u->INTSTAT) {
+
+ if (u->INTSTAT & STAT_RXRDY) {
+ chSysLockFromIsr();
+ if (chIQIsEmptyI(&sdp->iqueue))
+ chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
+ if (chIQPutI(&sdp->iqueue, u->RXDATA) < Q_OK)
+ chnAddFlagsI(sdp, SD_OVERRUN_ERROR);
+ chSysUnlockFromIsr();
+ }
+
+ if (u->INTSTAT & STAT_TXRDY) {
+ msg_t b;
+
+ chSysLockFromIsr();
+ b = chOQGetI(&sdp->oqueue);
+ chSysUnlockFromIsr();
+
+ if (b < Q_OK) {
+ u->INTENCLR = STAT_TXRDY;
+ chSysLockFromIsr();
+ chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
+ chSysUnlockFromIsr();
+ break;
+ }
+ else {
+ u->TXDATA = b;
+ }
+ }
+
+ if (u->INTSTAT & (STAT_OVERRUN | STAT_DELTARXBRK |
+ STAT_FRAMERR | STAT_PARITYERR) ) {
+ IOREG32 stat = u->STAT;
+ set_error(sdp, stat);
+ u->STAT = stat;
+ }
+
+ }
+}
+
+/**
+ * @brief Attempts a TX preload.
+ */
+static void preload(SerialDriver *sdp) {
+ LPC_USART_TypeDef *u = sdp->uart;
+
+ if (u->STAT & STAT_TXIDLE) {
+ msg_t b = chOQGetI(&sdp->oqueue);
+ if (b < Q_OK) {
+ chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
+ return;
+ }
+ u->TXDATA = b;
+ }
+ u->INTENSET = STAT_TXRDY;
+}
+
+/**
+ * @brief Driver output notification.
+ */
+#if LPC8xx_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+static void notify1(GenericQueue *qp) {
+
+ (void)qp;
+ preload(&SD1);
+}
+#endif
+
+#if LPC8xx_SERIAL_USE_UART1 || defined(__DOXYGEN__)
+static void notify2(GenericQueue *qp) {
+
+ (void)qp;
+ preload(&SD2);
+}
+#endif
+
+#if LPC8xx_SERIAL_USE_UART2 || defined(__DOXYGEN__)
+static void notify3(GenericQueue *qp) {
+
+ (void)qp;
+ preload(&SD3);
+}
+#endif
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+/**
+ * @brief UARTn IRQ handlers.
+ *
+ * @isr
+ */
+#if LPC8xx_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(Vector4C) {
+
+ CH_IRQ_PROLOGUE();
+ serve_interrupt( &SD1 );
+ CH_IRQ_EPILOGUE();
+}
+#endif
+#if LPC8xx_SERIAL_USE_UART1 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(Vector50) {
+
+ CH_IRQ_PROLOGUE();
+ serve_interrupt( &SD2 );
+ CH_IRQ_EPILOGUE();
+}
+#endif
+#if LPC8xx_SERIAL_USE_UART2 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(Vector54) {
+
+ 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 LPC8xx_SERIAL_USE_UART0
+ sdObjectInit(&SD1, NULL, notify1);
+ SD1.uart = LPC_USART0;
+#endif
+
+#if LPC8xx_SERIAL_USE_UART1
+ sdObjectInit(&SD2, NULL, notify2);
+ SD2.uart = LPC_USART1;
+#endif
+
+#if LPC8xx_SERIAL_USE_UART2
+ sdObjectInit(&SD3, NULL, notify3);
+ SD3.uart = LPC_USART2;
+#endif
+
+ /* Reset fractional baudrate generator */
+ LPC_SYSCON->PRESETCTRL &= ~(1<<2);
+ LPC_SYSCON->PRESETCTRL |= (1<<2);
+
+ LPC_SYSCON->UARTCLKDIV = LPC8xx_SERIAL_UARTCLKDIV;
+ LPC_SYSCON->UARTFRGDIV = LPC8xx_SERIAL_UARTFRGDIV;
+ LPC_SYSCON->UARTFRGMULT = LPC8xx_SERIAL_UARTFRGMULT;
+
+}
+
+/**
+ * @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 LPC8xx_SERIAL_USE_UART0
+ if (&SD1 == sdp) {
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1<<14); // Enable Clk
+ LPC_SYSCON->PRESETCTRL &= ~(1<<3); // Reset peripheral
+ LPC_SYSCON->PRESETCTRL |= (1<<3);
+ nvicEnableVector(UART0_IRQn,
+ CORTEX_PRIORITY_MASK(LPC8xx_SERIAL_UART0_IRQ_PRIORITY));
+ }
+#endif
+
+#if LPC8xx_SERIAL_USE_UART1
+ if (&SD2 == sdp) {
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1<<15); // Enable Clk
+ LPC_SYSCON->PRESETCTRL &= ~(1<<4); // Reset peripheral
+ LPC_SYSCON->PRESETCTRL |= (1<<4);
+ nvicEnableVector(UART1_IRQn,
+ CORTEX_PRIORITY_MASK(LPC8xx_SERIAL_UART1_IRQ_PRIORITY));
+ }
+#endif
+
+#if LPC8xx_SERIAL_USE_UART2
+ if (&SD3 == sdp) {
+ LPC_SYSCON->SYSAHBCLKCTRL |= (1<<16); // Enable Clk
+ LPC_SYSCON->PRESETCTRL &= ~(1<<5); // Reset peripheral
+ LPC_SYSCON->PRESETCTRL |= (1<<5);
+ nvicEnableVector(UART2_IRQn,
+ CORTEX_PRIORITY_MASK(LPC8xx_SERIAL_UART2_IRQ_PRIORITY));
+ }
+#endif
+
+ }
+
+ sdp->uart->BRG = (LPC8xx_SERIAL_U_PCLK / (config->sc_speed << 4)) -1;
+ sdp->uart->INTENSET = STAT_FRAMERR | STAT_OVERRUN |
+ STAT_PARITYERR | STAT_DELTARXBRK |
+ STAT_RXRDY;
+ sdp->uart->CFG = config->sc_cfg | CFG_ENA;
+}
+
+/**
+ * @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) {
+ sdp->uart->INTENCLR = STAT_TXRDY | STAT_RXRDY;
+ sdp->uart->CFG = 0;
+
+#if LPC8xx_SERIAL_USE_UART0
+ if (&SD1 == sdp) {
+ LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<12);
+ nvicDisableVector(UART0_IRQn);
+ return;
+ }
+#endif
+
+#if LPC8xx_SERIAL_USE_UART1
+ if (&SD2 == sdp) {
+ LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<13);
+ nvicDisableVector(UART1_IRQn);
+ return;
+ }
+#endif
+
+#if LPC8xx_SERIAL_USE_UART2
+ if (&SD3 == sdp) {
+ LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<14);
+ nvicDisableVector(UART2_IRQn);
+ return;
+ }
+#endif
+
+ }
+}
+
+#endif /* HAL_USE_SERIAL */
+
+/** @} */
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