diff options
Diffstat (limited to 'os/hal/ports/NRF5/LLD/UARTv1/hal_serial_lld.c')
| -rw-r--r-- | os/hal/ports/NRF5/LLD/UARTv1/hal_serial_lld.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/os/hal/ports/NRF5/LLD/UARTv1/hal_serial_lld.c b/os/hal/ports/NRF5/LLD/UARTv1/hal_serial_lld.c new file mode 100644 index 0000000..76ba0e0 --- /dev/null +++ b/os/hal/ports/NRF5/LLD/UARTv1/hal_serial_lld.c @@ -0,0 +1,343 @@ +/*
+ 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 UARTv1/hal_serial_lld.c
+ * @brief NRF5 serial subsystem low level driver source.
+ *
+ * @addtogroup SERIAL
+ * @{
+ */
+
+#include "hal.h"
+
+#if (HAL_USE_SERIAL == TRUE) || defined(__DOXYGEN__)
+
+#if NRF_SERIES == 51
+#include "nrf51.h"
+#elif NRF_SERIES == 52
+#include "nrf52.h"
+#define UART0_IRQn UARTE0_UART0_IRQn
+#endif
+
+/*===========================================================================*/
+/* Driver local definitions. */
+/*===========================================================================*/
+
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/** @brief USART1 serial driver identifier.*/
+#if (NRF5_SERIAL_USE_UART0 == TRUE) || defined(__DOXYGEN__)
+SerialDriver SD1;
+#endif
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/**
+ * @brief Driver default configuration.
+ */
+static const SerialConfig default_config = {
+ .speed = 38400,
+ .tx_pad = NRF5_SERIAL_PAD_DISCONNECTED,
+ .rx_pad = NRF5_SERIAL_PAD_DISCONNECTED,
+#if (NRF5_SERIAL_USE_HWFLOWCTRL == TRUE)
+ .rts_pad = NRF5_SERIAL_PAD_DISCONNECTED,
+ .cts_pad = NRF5_SERIAL_PAD_DISCONNECTED,
+#endif
+};
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/*
+ * @brief Maps a baudrate speed to a BAUDRATE register value.
+ */
+
+/**
+ * @brief Common UART configuration.
+ *
+ */
+static void configure_uart(const SerialConfig *config)
+{
+ uint32_t speed = UART_BAUDRATE_BAUDRATE_Baud250000;
+
+ switch (config->speed) {
+ case 1200: speed = UART_BAUDRATE_BAUDRATE_Baud1200; break;
+ case 2400: speed = UART_BAUDRATE_BAUDRATE_Baud2400; break;
+ case 4800: speed = UART_BAUDRATE_BAUDRATE_Baud4800; break;
+ case 9600: speed = UART_BAUDRATE_BAUDRATE_Baud9600; break;
+ case 14400: speed = UART_BAUDRATE_BAUDRATE_Baud14400; break;
+ case 19200: speed = UART_BAUDRATE_BAUDRATE_Baud19200; break;
+ case 28800: speed = UART_BAUDRATE_BAUDRATE_Baud28800; break;
+ case 38400: speed = UART_BAUDRATE_BAUDRATE_Baud38400; break;
+ case 57600: speed = UART_BAUDRATE_BAUDRATE_Baud57600; break;
+ case 76800: speed = UART_BAUDRATE_BAUDRATE_Baud76800; break;
+ case 115200: speed = UART_BAUDRATE_BAUDRATE_Baud115200; break;
+ case 230400: speed = UART_BAUDRATE_BAUDRATE_Baud230400; break;
+ case 250000: speed = UART_BAUDRATE_BAUDRATE_Baud250000; break;
+ case 460800: speed = UART_BAUDRATE_BAUDRATE_Baud460800; break;
+ case 921600: speed = UART_BAUDRATE_BAUDRATE_Baud921600; break;
+ case 1000000: speed = UART_BAUDRATE_BAUDRATE_Baud1M; break;
+ default: osalDbgAssert(0, "invalid baudrate"); break;
+ };
+
+ /* Configure PINs mode */
+ if (config->tx_pad != NRF5_SERIAL_PAD_DISCONNECTED) {
+ palSetPadMode(IOPORT1, config->tx_pad, PAL_MODE_OUTPUT_PUSHPULL);
+ }
+ if (config->rx_pad != NRF5_SERIAL_PAD_DISCONNECTED) {
+ palSetPadMode(IOPORT1, config->rx_pad, PAL_MODE_INPUT);
+ }
+#if (NRF5_SERIAL_USE_HWFLOWCTRL == TRUE)
+ if (config->rts_pad != NRF5_SERIAL_PAD_DISCONNECTED) {
+ palSetPadMode(IOPORT1, config->rts_pad, PAL_MODE_OUTPUT_PUSHPULL);
+ }
+ if (config->cts_pad != NRF5_SERIAL_PAD_DISCONNECTED) {
+ palSetPadMode(IOPORT1, config->cts_pad, PAL_MODE_INPUT);
+ }
+#endif
+
+ /* Select PINs used by UART */
+ NRF_UART0->PSELTXD = config->tx_pad;
+ NRF_UART0->PSELRXD = config->rx_pad;
+#if (NRF5_SERIAL_USE_HWFLOWCTRL == TRUE)
+ NRF_UART0->PSELRTS = config->rts_pad;
+ NRF_UART0->PSELCTS = config->cts_pad;
+#else
+ NRF_UART0->PSELRTS = NRF5_SERIAL_PAD_DISCONNECTED;
+ NRF_UART0->PSELCTS = NRF5_SERIAL_PAD_DISCONNECTED;
+#endif
+
+ /* Set baud rate */
+ NRF_UART0->BAUDRATE = speed;
+
+ /* Set config */
+ NRF_UART0->CONFIG = (UART_CONFIG_PARITY_Excluded << UART_CONFIG_PARITY_Pos);
+
+ /* Adjust flow control */
+#if (NRF5_SERIAL_USE_HWFLOWCTRL == TRUE)
+ if ((config->rts_pad < TOTAL_GPIO_PADS) ||
+ (config->cts_pad < TOTAL_GPIO_PADS)) {
+ NRF_UART0->CONFIG |= UART_CONFIG_HWFC_Enabled << UART_CONFIG_HWFC_Pos;
+ } else {
+ NRF_UART0->CONFIG &= ~(UART_CONFIG_HWFC_Enabled << UART_CONFIG_HWFC_Pos);
+ }
+#else
+ NRF_UART0->CONFIG &= ~(UART_CONFIG_HWFC_Enabled << UART_CONFIG_HWFC_Pos);
+#endif
+
+ /* Enable UART and clear events */
+ NRF_UART0->ENABLE = UART_ENABLE_ENABLE_Enabled;
+ NRF_UART0->EVENTS_RXDRDY = 0;
+ NRF_UART0->EVENTS_TXDRDY = 0;
+#if CORTEX_MODEL >= 4
+ (void)NRF_UART0->EVENTS_RXDRDY;
+ (void)NRF_UART0->EVENTS_TXDRDY;
+#endif
+
+ if (config->rx_pad != NRF5_SERIAL_PAD_DISCONNECTED) {
+ while (NRF_UART0->EVENTS_RXDRDY != 0) {
+ (void)NRF_UART0->RXD;
+ }
+ }
+}
+
+
+/**
+ * @brief Driver output notification.
+ */
+#if NRF5_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+static void notify1(io_queue_t *qp)
+{
+ SerialDriver *sdp = &SD1;
+
+ (void)qp;
+
+ if (NRF_UART0->PSELTXD == NRF5_SERIAL_PAD_DISCONNECTED)
+ return;
+
+ if (!sdp->tx_busy) {
+ msg_t b = oqGetI(&sdp->oqueue);
+
+ if (b < Q_OK) {
+ chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
+ NRF_UART0->TASKS_STOPTX = 1;
+ return;
+ }
+ sdp->tx_busy = 1;
+ NRF_UART0->TASKS_STARTTX = 1;
+ NRF_UART0->TXD = b;
+ }
+}
+#endif
+
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+#if NRF5_SERIAL_USE_UART0 || defined(__DOXYGEN__)
+OSAL_IRQ_HANDLER(Vector48) {
+
+ OSAL_IRQ_PROLOGUE();
+
+ SerialDriver *sdp = &SD1;
+ uint32_t isr = NRF_UART0->INTENSET;
+
+ if ((NRF_UART0->EVENTS_RXDRDY != 0) && (isr & UART_INTENSET_RXDRDY_Msk)) {
+ // Clear UART RX event flag
+ NRF_UART0->EVENTS_RXDRDY = 0;
+#if CORTEX_MODEL >= 4
+ (void)NRF_UART0->EVENTS_RXDRDY;
+#endif
+
+ osalSysLockFromISR();
+ if (iqIsEmptyI(&sdp->iqueue))
+ chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
+ if (iqPutI(&sdp->iqueue, NRF_UART0->RXD) < Q_OK)
+ chnAddFlagsI(sdp, SD_OVERRUN_ERROR);
+ osalSysUnlockFromISR();
+ }
+
+ if ((NRF_UART0->EVENTS_TXDRDY != 0) && (isr & UART_INTENSET_TXDRDY_Msk)) {
+ msg_t b;
+
+ // Clear UART TX event flag.
+ NRF_UART0->EVENTS_TXDRDY = 0;
+#if CORTEX_MODEL >= 4
+ (void)NRF_UART0->EVENTS_TXDRDY;
+#endif
+
+ osalSysLockFromISR();
+ b = oqGetI(&sdp->oqueue);
+ osalSysUnlockFromISR();
+
+ if (b < Q_OK) {
+ osalSysLockFromISR();
+ chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
+ osalSysUnlockFromISR();
+ NRF_UART0->TASKS_STOPTX = 1;
+ sdp->tx_busy = 0;
+ } else {
+ sdp->tx_busy = 1;
+ NRF_UART0->TXD = b;
+ }
+ }
+
+ /* TODO: Error handling for EVENTS_ERROR */
+ if ((NRF_UART0->EVENTS_ERROR != 0) && (isr & UART_INTENSET_ERROR_Msk)) {
+ // Clear UART ERROR event flag.
+ NRF_UART0->EVENTS_ERROR = 0;
+#if CORTEX_MODEL >= 4
+ (void)NRF_UART0->EVENTS_ERROR;
+#endif
+ }
+
+
+ OSAL_IRQ_EPILOGUE();
+}
+#endif
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Low level serial driver initialization.
+ *
+ * @notapi
+ */
+void sd_lld_init(void) {
+
+#if NRF5_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;
+
+ osalDbgAssert(
+ (config->rx_pad < TOTAL_GPIO_PADS) || (config->tx_pad < TOTAL_GPIO_PADS),
+ "must configure at least an RX or TX pad");
+
+ if (sdp->state == SD_STOP) {
+
+#if NRF5_SERIAL_USE_UART0 == TRUE
+ if (sdp == &SD1) {
+ configure_uart(config);
+
+ // Enable UART interrupt
+ NRF_UART0->INTENCLR = (uint32_t)-1;
+ NRF_UART0->INTENSET = UART_INTENSET_ERROR_Msk;
+ if (config->rx_pad != NRF5_SERIAL_PAD_DISCONNECTED)
+ NRF_UART0->INTENSET |= UART_INTENSET_RXDRDY_Msk;
+ if (config->tx_pad != NRF5_SERIAL_PAD_DISCONNECTED)
+ NRF_UART0->INTENSET |= UART_INTENSET_TXDRDY_Msk;
+
+ nvicEnableVector(UART0_IRQn, NRF5_SERIAL_UART0_PRIORITY);
+
+ if (config->rx_pad != NRF5_SERIAL_PAD_DISCONNECTED)
+ NRF_UART0->TASKS_STARTRX = 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 NRF5_SERIAL_USE_UART0 == TRUE
+ if (&SD1 == sdp) {
+ nvicDisableVector(UART0_IRQn);
+ NRF_UART0->ENABLE = UART_ENABLE_ENABLE_Disabled;
+ }
+#endif
+ }
+}
+
+#endif /* HAL_USE_SERIAL == TRUE */
+
+/** @} */
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