diff options
Diffstat (limited to 'os/hal/platforms/LPC214x/serial_lld.c')
| -rw-r--r-- | os/hal/platforms/LPC214x/serial_lld.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/os/hal/platforms/LPC214x/serial_lld.c b/os/hal/platforms/LPC214x/serial_lld.c new file mode 100644 index 000000000..c7db717b2 --- /dev/null +++ b/os/hal/platforms/LPC214x/serial_lld.c @@ -0,0 +1,337 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/RT is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file LPC214x/serial_lld.c
+ * @brief LPC214x low level serial driver code
+ * @addtogroup LPC214x_SERIAL
+ * @{
+ */
+
+#include <ch.h>
+#include <serial.h>
+
+#include "board.h"
+#include "vic.h"
+
+#if USE_LPC214x_UART0 || defined(__DOXYGEN__)
+/** @brief UART0 serial driver identifier.*/
+SerialDriver SD1;
+#endif
+
+#if USE_LPC214x_UART1 || defined(__DOXYGEN__)
+/** @brief UART1 serial driver identifier.*/
+SerialDriver SD2;
+#endif
+
+/** @brief Driver default configuration.*/
+static const SerialDriverConfig default_config = {
+ 38400,
+ LCR_WL8 | LCR_STOP1 | LCR_NOPARITY,
+ FCR_TRIGGER0
+};
+
+/*===========================================================================*/
+/* Low Level Driver local functions. */
+/*===========================================================================*/
+
+/**
+ * @brief UART initialization.
+ * @param[in] u pointer to an UART I/O block
+ * @param[in] config the architecture-dependent serial driver configuration
+ */
+static void uart_init(UART *u, const SerialDriverConfig *config) {
+
+ uint32_t div = PCLK / (config->speed << 4);
+ u->UART_LCR = config->lcr | LCR_DLAB;
+ u->UART_DLL = div;
+ u->UART_DLM = div >> 8;
+ u->UART_LCR = config->lcr;
+ u->UART_FCR = FCR_ENABLE | FCR_RXRESET | FCR_TXRESET | config->fcr;
+ u->UART_ACR = 0;
+ u->UART_FDR = 0x10;
+ u->UART_TER = TER_ENABLE;
+ u->UART_IER = IER_RBR | IER_STATUS;
+}
+
+/**
+ * @brief UART de-initialization.
+ * @param[in] u pointer to an UART I/O block
+ */
+static void uart_deinit(UART *u) {
+
+ u->UART_DLL = 1;
+ u->UART_DLM = 0;
+ u->UART_FDR = 0x10;
+ u->UART_IER = 0;
+ u->UART_FCR = FCR_RXRESET | FCR_TXRESET;
+ u->UART_LCR = 0;
+ u->UART_ACR = 0;
+ u->UART_TER = TER_ENABLE;
+}
+
+/**
+ * @brief Error handling routine.
+ * @param[in] err UART LSR register value
+ * @param[in] sdp communication channel associated to the UART
+ */
+static void set_error(IOREG32 err, SerialDriver *sdp) {
+ sdflags_t sts = 0;
+
+ if (err & LSR_OVERRUN)
+ sts |= SD_OVERRUN_ERROR;
+ if (err & LSR_PARITY)
+ sts |= SD_PARITY_ERROR;
+ if (err & LSR_FRAMING)
+ sts |= SD_FRAMING_ERROR;
+ if (err & LSR_BREAK)
+ sts |= SD_BREAK_DETECTED;
+ chSysLockFromIsr();
+ sdAddFlagsI(sdp, sts);
+ chSysUnlockFromIsr();
+}
+
+#if defined(__GNU__)
+__attribute__((noinline))
+#endif
+/**
+ * @brief Common IRQ handler.
+ * @param[in] u pointer to an UART I/O block
+ * @param[in] sdp communication channel associated to the UART
+ * @note Tries hard to clear all the pending interrupt sources, we dont want to
+ * go through the whole ISR and have another interrupt soon after.
+ */
+static void serve_interrupt(UART *u, SerialDriver *sdp) {
+
+ while (TRUE) {
+
+ switch (u->UART_IIR & IIR_SRC_MASK) {
+ case IIR_SRC_NONE:
+ return;
+ case IIR_SRC_ERROR:
+ set_error(u->UART_LSR, sdp);
+ break;
+ case IIR_SRC_TIMEOUT:
+ case IIR_SRC_RX:
+ while (u->UART_LSR & LSR_RBR_FULL) {
+ chSysLockFromIsr();
+ if (chIQPutI(&sdp->d2.iqueue, u->UART_RBR) < Q_OK)
+ sdAddFlagsI(sdp, SD_OVERRUN_ERROR);
+ chSysUnlockFromIsr();
+ }
+ chSysLockFromIsr();
+ chEvtBroadcastI(&sdp->d1.ievent);
+ chSysUnlockFromIsr();
+ break;
+ case IIR_SRC_TX:
+ {
+#if UART_FIFO_PRELOAD > 0
+ int i = UART_FIFO_PRELOAD;
+ do {
+ chSysLockFromIsr();
+ msg_t b = chOQGetI(&sdp->d2.oqueue);
+ chSysUnlockFromIsr();
+ if (b < Q_OK) {
+ u->UART_IER &= ~IER_THRE;
+ chSysLockFromIsr();
+ chEvtBroadcastI(&sdp->d1.oevent);
+ chSysUnlockFromIsr();
+ break;
+ }
+ u->UART_THR = b;
+ } while (--i);
+#else
+ chSysLockFromIsr();
+ msg_t b = sdRequestDataI(sdp);
+ chSysUnlockFromIsr();
+ if (b < Q_OK)
+ u->UART_IER &= ~IER_THRE;
+ else
+ u->UART_THR = b;
+#endif
+ }
+ default:
+ (void) u->UART_THR;
+ (void) u->UART_RBR;
+ }
+ }
+}
+
+#if UART_FIFO_PRELOAD > 0
+static void preload(UART *u, SerialDriver *sdp) {
+
+ if (u->UART_LSR & LSR_THRE) {
+ int i = UART_FIFO_PRELOAD;
+ do {
+ chSysLockFromIsr();
+ msg_t b = chOQGetI(&sdp->d2.oqueue);
+ chSysUnlockFromIsr();
+ if (b < Q_OK) {
+ chSysLockFromIsr();
+ chEvtBroadcastI(&sdp->d1.oevent);
+ chSysUnlockFromIsr();
+ return;
+ }
+ u->UART_THR = b;
+ } while (--i);
+ }
+ u->UART_IER |= IER_THRE;
+}
+#endif
+
+#if USE_LPC214x_UART0 || defined(__DOXYGEN__)
+static void notify1(void) {
+#if UART_FIFO_PRELOAD > 0
+
+ preload(U0Base, &SD1);
+#else
+ UART *u = U0Base;
+
+ if (u->UART_LSR & LSR_THRE) {
+ chSysLockFromIsr();
+ u->UART_THR = chOQGetI(&SD1.sd_oqueue);
+ chSysUnlockFromIsr();
+ }
+ u->UART_IER |= IER_THRE;
+#endif
+}
+#endif
+
+#if USE_LPC214x_UART1 || defined(__DOXYGEN__)
+static void notify2(void) {
+#if UART_FIFO_PRELOAD > 0
+
+ preload(U1Base, &SD2);
+#else
+ UART *u = U1Base;
+
+ if (u->UART_LSR & LSR_THRE)
+ u->UART_THR = chOQGetI(&SD2.sd_oqueue);
+ u->UART_IER |= IER_THRE;
+#endif
+}
+#endif
+
+/*===========================================================================*/
+/* Low Level Driver interrupt handlers. */
+/*===========================================================================*/
+
+#if USE_LPC214x_UART0 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(UART0IrqHandler) {
+
+ CH_IRQ_PROLOGUE();
+
+ serve_interrupt(U0Base, &SD1);
+ VICVectAddr = 0;
+
+ CH_IRQ_EPILOGUE();
+}
+#endif
+
+#if USE_LPC214x_UART1 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(UART1IrqHandler) {
+
+ CH_IRQ_PROLOGUE();
+
+ serve_interrupt(U1Base, &SD2);
+ VICVectAddr = 0;
+
+ CH_IRQ_EPILOGUE();
+}
+#endif
+
+
+/*===========================================================================*/
+/* Low Level Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * Low level serial driver initialization. + */
+void sd_lld_init(void) {
+
+#if USE_LPC214x_UART0
+ sdObjectInit(&SD1, NULL, notify1);
+ SetVICVector(UART0IrqHandler, LPC214x_UART1_PRIORITY, SOURCE_UART0);
+#endif
+#if USE_LPC214x_UART1
+ sdObjectInit(&SD2, NULL, notify2);
+ SetVICVector(UART1IrqHandler, LPC214x_UART2_PRIORITY, SOURCE_UART1);
+#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.
+ */
+void sd_lld_start(SerialDriver *sdp, const SerialDriverConfig *config) {
+
+ if (config == NULL)
+ config = &default_config;
+
+#if USE_LPC214x_UART1
+ if (&SD1 == sdp) {
+ PCONP = (PCONP & PCALL) | PCUART0;
+ uart_init(U0Base, config);
+ VICIntEnable = INTMASK(SOURCE_UART0);
+ return;
+ }
+#endif
+#if USE_LPC214x_UART2
+ if (&SD2 == sdp) {
+ PCONP = (PCONP & PCALL) | PCUART1;
+ uart_init(U1Base, config);
+ VICIntEnable = INTMASK(SOURCE_UART1);
+ return;
+ }
+#endif
+}
+
+/**
+ * @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
+ */
+void sd_lld_stop(SerialDriver *sdp) {
+
+#if USE_LPC214x_UART1
+ if (&SD1 == sdp) {
+ uart_deinit(U0Base);
+ PCONP = (PCONP & PCALL) & ~PCUART0;
+ VICIntEnClear = INTMASK(SOURCE_UART0);
+ return;
+ }
+#endif
+#if USE_LPC214x_UART2
+ if (&SD2 == sdp) {
+ uart_deinit(U1Base);
+ PCONP = (PCONP & PCALL) & ~PCUART1;
+ VICIntEnClear = INTMASK(SOURCE_UART1);
+ return;
+ }
+#endif
+}
+
+/** @} */
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