diff options
Diffstat (limited to 'os/hal/ports/NRF51/NRF51822/serial_lld.c')
| -rw-r--r-- | os/hal/ports/NRF51/NRF51822/serial_lld.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/os/hal/ports/NRF51/NRF51822/serial_lld.c b/os/hal/ports/NRF51/NRF51822/serial_lld.c new file mode 100644 index 0000000..c98405d --- /dev/null +++ b/os/hal/ports/NRF51/NRF51822/serial_lld.c @@ -0,0 +1,207 @@ +/*
+ Copyright (C) 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 serial_lld.c
+ * @brief NRF51822 serial subsystem low level driver source.
+ *
+ * @addtogroup SERIAL
+ * @{
+ */
+
+#include "hal.h"
+
+#if (HAL_USE_SERIAL == TRUE) || defined(__DOXYGEN__)
+
+#include "nrf51.h"
+
+/*===========================================================================*/
+/* Driver local definitions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/** @brief USART1 serial driver identifier.*/
+#if (NRF51_SERIAL_USE_UART0 == TRUE) || defined(__DOXYGEN__)
+SerialDriver SD1;
+#endif
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/**
+ * @brief Driver default configuration.
+ */
+static const SerialConfig default_config = {
+ 38400
+};
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Driver output notification.
+ */
+#if NRF51_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+static void notify1(io_queue_t *qp)
+{
+ (void)qp;
+
+ //if (NRF_UART0->EVENTS_TXDRDY) {
+ msg_t b = oqGetI(&SD1.oqueue);
+ if (b < Q_OK) {
+ chnAddFlagsI(&SD1, CHN_OUTPUT_EMPTY);
+ return;
+ }
+ NRF_UART0->TXD = b;
+ //NRF_UART0->INTENCLR = 0x80; // clear TX interrupt
+ //}
+}
+#endif
+
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+#if NRF51_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+OSAL_IRQ_HANDLER(Vector48) {
+
+ OSAL_IRQ_PROLOGUE();
+
+ if (NRF_UART0->EVENTS_RXDRDY) {
+ osalSysLockFromISR();
+ if (iqIsEmptyI(&SD1.iqueue))
+ chnAddFlagsI(&SD1, CHN_INPUT_AVAILABLE);
+ if (iqPutI(&SD1.iqueue, NRF_UART0->RXD) < Q_OK)
+ chnAddFlagsI(&SD1, SD_OVERRUN_ERROR);
+ //NRF_UART0->INTENCLR = 4;
+ osalSysUnlockFromISR();
+ }
+
+ if (NRF_UART0->EVENTS_TXDRDY) {
+ msg_t b;
+
+ osalSysLockFromISR();
+ b = oqGetI(&SD1.oqueue);
+ osalSysUnlockFromISR();
+
+ if (b < Q_OK) {
+ osalSysLockFromISR();
+ chnAddFlagsI(&SD1, CHN_OUTPUT_EMPTY);
+ osalSysUnlockFromISR();
+ NRF_UART0->INTENCLR = 0x80; // clear TX interrupt
+ } else {
+ NRF_UART0->TXD = b;
+ }
+ }
+
+ OSAL_IRQ_EPILOGUE();
+}
+#endif
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Low level serial driver initialization.
+ *
+ * @notapi
+ */
+void sd_lld_init(void) {
+
+#if NRF51_SERIAL_USE_UART0 == TRUE
+ sdObjectInit(&SD1, NULL, notify1);
+#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 NRF51_SERIAL_USE_UART0 == TRUE
+ if (sdp == &SD1) {
+ /* FIXME: some board specific, some hardcodeds! */
+
+ /* Configure PINs */
+ NRF_UART0->PSELRTS = ~0;
+ NRF_UART0->PSELCTS = ~0;
+
+ NRF_GPIO->PIN_CNF[9] = 1;
+ NRF_UART0->PSELTXD = 9;
+ NRF_UART0->PSELRXD = 11;
+
+ /* 38400!!! */
+ NRF_UART0->BAUDRATE = 0x009D5000;
+
+ /* Enable interrupts for RX, TX and ERROR */
+ NRF_UART0->INTENSET = 0x284;
+
+ nvicEnableVector(UART0_IRQn, 12);
+
+ NRF_UART0->ENABLE = 4;
+ NRF_UART0->TASKS_STARTRX = 1;
+ NRF_UART0->TASKS_STARTTX = 1;
+ }
+#endif
+
+ }
+}
+
+/**
+ * @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) {
+
+#if NRF51_SERIAL_USE_UART0 == TRUE
+ if (&SD1 == sdp) {
+ nvicDisableVector(UART0_IRQn);
+ }
+#endif
+
+ }
+}
+
+#endif /* HAL_USE_SERIAL == TRUE */
+
+/** @} */
|