Lee Kai Xuan
mbed-os
Fork of
mbed-os
by 
erkin yucel
Diff: targets/TARGET_NORDIC/TARGET_NRF5/serial_api.c
- Revision:
- 0:f269e3021894
diff -r 000000000000 -r f269e3021894 targets/TARGET_NORDIC/TARGET_NRF5/serial_api.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_NORDIC/TARGET_NRF5/serial_api.c Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,654 @@
+/*
+ * Copyright (c) 2013 Nordic Semiconductor ASA
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list
+ * of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA
+ * integrated circuit in a product or a software update for such product, must reproduce
+ * the above copyright notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without specific prior
+ * written permission.
+ *
+ * 4. This software, with or without modification, must only be used with a
+ * Nordic Semiconductor ASA integrated circuit.
+ *
+ * 5. Any software provided in binary or object form under this license must not be reverse
+ * engineered, decompiled, modified and/or disassembled.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "serial_api.h"
+
+#if DEVICE_SERIAL
+
+#include <string.h>
+#include "mbed_assert.h"
+#include "mbed_error.h"
+#include "nrf_uart.h"
+#include "nrf_drv_common.h"
+#include "nrf_drv_config.h"
+#include "app_util_platform.h"
+#include "nrf_gpio.h"
+
+#define UART_INSTANCE_COUNT 1
+#define UART_INSTANCE NRF_UART0
+#define UART_IRQn UART0_IRQn
+#define UART_IRQ_HANDLER UART0_IRQHandler
+#define UART_INSTANCE_ID 0
+#define UART_CB uart_cb[UART_INSTANCE_ID]
+
+#define UART_DEFAULT_BAUDRATE UART0_CONFIG_BAUDRATE
+#define UART_DEFAULT_PARITY UART0_CONFIG_PARITY
+
+// expected the macro from mbed configuration system
+#ifndef MBED_CONF_NORDIC_UART_HWFC
+ #define MBED_CONF_NORDIC_UART_HWFC 1
+ #warning None of UART flow control configuration (expected macro MBED_CONF_NORDIC_UART_HWFC). The RTSCTS flow control is used by default .
+#endif
+
+#if MBED_CONF_NORDIC_UART_HWFC == 1
+ #define UART_DEFAULT_HWFC UART0_CONFIG_HWFC
+#else
+ #define UART_DEFAULT_HWFC NRF_UART_HWFC_DISABLED
+#endif
+
+#define UART_DEFAULT_CTS UART0_CONFIG_PSEL_CTS
+#define UART_DEFAULT_RTS UART0_CONFIG_PSEL_RTS
+
+// Required by "retarget.cpp".
+int stdio_uart_inited = 0;
+serial_t stdio_uart;
+
+typedef struct {
+ bool initialized;
+ uint32_t irq_context;
+ uart_irq_handler irq_handler;
+
+ uint32_t pselrxd;
+ uint32_t pseltxd;
+ uint32_t pselcts;
+ uint32_t pselrts;
+ nrf_uart_hwfc_t hwfc;
+ nrf_uart_parity_t parity;
+ nrf_uart_baudrate_t baudrate;
+
+#if DEVICE_SERIAL_ASYNCH
+ bool volatile rx_active;
+ uint8_t *rx_buffer;
+ size_t rx_length;
+ size_t rx_pos;
+ void (*rx_asynch_handler)();
+ uint8_t char_match;
+
+ bool volatile tx_active;
+ const uint8_t *tx_buffer;
+ size_t tx_length;
+ size_t tx_pos;
+ void (*tx_asynch_handler)();
+
+ uint32_t events_wanted;
+ uint32_t events_occured;
+
+ #define UART_IRQ_TX 1
+ #define UART_IRQ_RX 2
+ uint8_t irq_enabled;
+#endif // DEVICE_SERIAL_ASYNCH
+} uart_ctlblock_t;
+
+static uart_ctlblock_t uart_cb[UART_INSTANCE_COUNT];
+
+static void internal_set_hwfc(FlowControl type,
+ PinName rxflow, PinName txflow);
+
+
+#if DEVICE_SERIAL_ASYNCH
+static void end_asynch_rx(void)
+{
+ // If RX interrupt is activated for synchronous operations,
+ // don't disable it, just stop handling it here.
+ if (!(UART_CB.irq_enabled & UART_IRQ_RX)) {
+ nrf_uart_int_disable(UART_INSTANCE, NRF_UART_INT_MASK_RXDRDY);
+ }
+ UART_CB.rx_active = false;
+}
+static void end_asynch_tx(void)
+{
+ // If TX interrupt is activated for synchronous operations,
+ // don't disable it, just stop handling it here.
+ if (!(UART_CB.irq_enabled & UART_IRQ_TX)) {
+ nrf_uart_int_disable(UART_INSTANCE, NRF_UART_INT_MASK_TXDRDY);
+ }
+ UART_CB.tx_active = false;
+}
+#endif // DEVICE_SERIAL_ASYNCH
+
+void UART_IRQ_HANDLER(void)
+{
+ if (nrf_uart_int_enable_check(UART_INSTANCE, NRF_UART_INT_MASK_RXDRDY) &&
+ nrf_uart_event_check(UART_INSTANCE, NRF_UART_EVENT_RXDRDY)) {
+
+ #if DEVICE_SERIAL_ASYNCH
+ if (UART_CB.rx_active) {
+ nrf_uart_event_clear(UART_INSTANCE, NRF_UART_EVENT_RXDRDY);
+
+ uint8_t rx_data = nrf_uart_rxd_get(UART_INSTANCE);
+ UART_CB.rx_buffer[UART_CB.rx_pos] = rx_data;
+
+ bool end_rx = false;
+ // If character matching should be performed, check if the current
+ // data matches the given one.
+ if (UART_CB.char_match != SERIAL_RESERVED_CHAR_MATCH &&
+ rx_data == UART_CB.char_match) {
+ // If it does, report the match and abort further receiving.
+ UART_CB.events_occured |= SERIAL_EVENT_RX_CHARACTER_MATCH;
+ if (UART_CB.events_wanted & SERIAL_EVENT_RX_CHARACTER_MATCH) {
+ end_rx = true;
+ }
+ }
+ if (++UART_CB.rx_pos >= UART_CB.rx_length) {
+ UART_CB.events_occured |= SERIAL_EVENT_RX_COMPLETE;
+ end_rx = true;
+ }
+ if (end_rx) {
+ end_asynch_rx();
+
+ if (UART_CB.rx_asynch_handler) {
+ // Use local variable to make it possible to start a next
+ // transfer from callback routine.
+ void (*handler)() = UART_CB.rx_asynch_handler;
+ UART_CB.rx_asynch_handler = NULL;
+ handler();
+ }
+ }
+ }
+ else
+ #endif
+
+ if (UART_CB.irq_handler) {
+ UART_CB.irq_handler(UART_CB.irq_context, RxIrq);
+ }
+ }
+
+ if (nrf_uart_int_enable_check(UART_INSTANCE, NRF_UART_INT_MASK_TXDRDY) &&
+ nrf_uart_event_check(UART_INSTANCE, NRF_UART_EVENT_TXDRDY)) {
+
+ #if DEVICE_SERIAL_ASYNCH
+ if (UART_CB.tx_active) {
+ if (++UART_CB.tx_pos <= UART_CB.tx_length) {
+ // When there is still something to send, clear the TXDRDY event
+ // and put next byte to transmitter.
+ nrf_uart_event_clear(UART_INSTANCE, NRF_UART_EVENT_TXDRDY);
+ nrf_uart_txd_set(UART_INSTANCE,
+ UART_CB.tx_buffer[UART_CB.tx_pos]);
+ }
+ else {
+ // When the TXDRDY event is set after the last byte to be sent
+ // has been passed to the transmitter, the job is done and TX
+ // complete can be indicated.
+ // Don't clear the TXDRDY event, it needs to remain set for the
+ // 'serial_writable' function to work properly.
+ end_asynch_tx();
+
+ UART_CB.events_occured |= SERIAL_EVENT_TX_COMPLETE;
+ if (UART_CB.tx_asynch_handler) {
+ // Use local variable to make it possible to start a next
+ // transfer from callback routine.
+ void (*handler)() = UART_CB.tx_asynch_handler;
+ UART_CB.tx_asynch_handler = NULL;
+ handler();
+ }
+ }
+ }
+ else
+ #endif
+
+ if (UART_CB.irq_handler) {
+ UART_CB.irq_handler(UART_CB.irq_context, TxIrq);
+ }
+ }
+
+#if DEVICE_SERIAL_ASYNCH
+ if (nrf_uart_event_check(UART_INSTANCE, NRF_UART_EVENT_ERROR)) {
+ nrf_uart_event_clear(UART_INSTANCE, NRF_UART_EVENT_ERROR);
+
+ uint8_t errorsrc = nrf_uart_errorsrc_get_and_clear(UART_INSTANCE);
+ if (UART_CB.rx_asynch_handler) {
+ UART_CB.events_occured |= SERIAL_EVENT_ERROR;
+ if (errorsrc & NRF_UART_ERROR_PARITY_MASK) {
+ UART_CB.events_occured |= SERIAL_EVENT_RX_PARITY_ERROR;
+ }
+ if (errorsrc & NRF_UART_ERROR_FRAMING_MASK) {
+ UART_CB.events_occured |= SERIAL_EVENT_RX_FRAMING_ERROR;
+ }
+ if (errorsrc & NRF_UART_ERROR_OVERRUN_MASK) {
+ UART_CB.events_occured |= SERIAL_EVENT_RX_OVERRUN_ERROR;
+ }
+ UART_CB.rx_asynch_handler();
+ }
+ }
+#endif // DEVICE_SERIAL_ASYNCH
+}
+
+void serial_init(serial_t *obj, PinName tx, PinName rx) {
+ UART_CB.pseltxd =
+ (tx == NC) ? NRF_UART_PSEL_DISCONNECTED : (uint32_t)tx;
+ UART_CB.pselrxd =
+ (rx == NC) ? NRF_UART_PSEL_DISCONNECTED : (uint32_t)rx;
+ if (UART_CB.pseltxd != NRF_UART_PSEL_DISCONNECTED) {
+ nrf_gpio_pin_set(UART_CB.pseltxd);
+ nrf_gpio_cfg_output(UART_CB.pseltxd);
+ }
+ if (UART_CB.pselrxd != NRF_UART_PSEL_DISCONNECTED) {
+ nrf_gpio_cfg_input(UART_CB.pselrxd, NRF_GPIO_PIN_NOPULL);
+ }
+
+ if (UART_CB.initialized) {
+ // For already initialized peripheral it is sufficient to reconfigure
+ // RX/TX pins only.
+
+ // Ensure that there is no unfinished TX transfer.
+ while (!serial_writable(obj)) {
+ }
+ // UART pins can be configured only when the peripheral is disabled.
+ nrf_uart_disable(UART_INSTANCE);
+ nrf_uart_txrx_pins_set(UART_INSTANCE, UART_CB.pseltxd, UART_CB.pselrxd);
+ nrf_uart_enable(UART_INSTANCE);
+ }
+ else {
+ UART_CB.baudrate = UART_DEFAULT_BAUDRATE;
+ UART_CB.parity = UART_DEFAULT_PARITY;
+ UART_CB.hwfc = UART_DEFAULT_HWFC;
+ UART_CB.pselcts = UART_DEFAULT_CTS;
+ UART_CB.pselrts = UART_DEFAULT_RTS;
+
+ nrf_uart_event_clear(UART_INSTANCE, NRF_UART_EVENT_RXDRDY);
+ nrf_uart_event_clear(UART_INSTANCE, NRF_UART_EVENT_TXDRDY);
+ nrf_uart_task_trigger(UART_INSTANCE, NRF_UART_TASK_STARTRX);
+ nrf_uart_task_trigger(UART_INSTANCE, NRF_UART_TASK_STARTTX);
+
+ nrf_uart_int_disable(UART_INSTANCE, NRF_UART_INT_MASK_RXDRDY |
+ NRF_UART_INT_MASK_TXDRDY);
+ #if DEVICE_SERIAL_ASYNCH
+ nrf_uart_int_enable(UART_INSTANCE, NRF_UART_INT_MASK_ERROR);
+ #endif
+ nrf_drv_common_irq_enable(UART_IRQn, APP_IRQ_PRIORITY_LOW);
+
+ // TX interrupt needs to be signaled when transmitter buffer is empty,
+ // so a dummy transmission is needed to get the TXDRDY event initially
+ // set.
+ nrf_uart_configure(UART_INSTANCE,
+ NRF_UART_PARITY_EXCLUDED, NRF_UART_HWFC_DISABLED);
+ // Use maximum baud rate, so this dummy transmission takes as little
+ // time as possible.
+ nrf_uart_baudrate_set(UART_INSTANCE, NRF_UART_BAUDRATE_1000000);
+ // Perform it with disconnected TX pin, so nothing actually comes out
+ // of the device.
+ nrf_uart_txrx_pins_disconnect(UART_INSTANCE);
+ nrf_uart_hwfc_pins_disconnect(UART_INSTANCE);
+ nrf_uart_enable(UART_INSTANCE);
+ nrf_uart_txd_set(UART_INSTANCE, 0);
+ while (!nrf_uart_event_check(UART_INSTANCE, NRF_UART_EVENT_TXDRDY)) {
+ }
+ nrf_uart_disable(UART_INSTANCE);
+
+ // Now everything is prepared to set the default configuration and
+ // connect the peripheral to actual pins.
+ nrf_uart_txrx_pins_set(UART_INSTANCE, UART_CB.pseltxd, UART_CB.pselrxd);
+ nrf_uart_baudrate_set(UART_INSTANCE, UART_CB.baudrate);
+ nrf_uart_configure(UART_INSTANCE, UART_CB.parity, UART_CB.hwfc);
+ if (UART_CB.hwfc == NRF_UART_HWFC_ENABLED) {
+ internal_set_hwfc(FlowControlRTSCTS,
+ (PinName) UART_CB.pselrts, (PinName) UART_CB.pselcts);
+ }
+
+ nrf_uart_enable(UART_INSTANCE);
+
+ UART_CB.initialized = true;
+ }
+
+ if (tx == STDIO_UART_TX && rx == STDIO_UART_RX) {
+ stdio_uart_inited = 1;
+ memcpy(&stdio_uart, obj, sizeof(serial_t));
+ }
+ else {
+ stdio_uart_inited = 0;
+ }
+}
+
+void serial_free(serial_t *obj)
+{
+ (void)obj;
+
+ if (UART_CB.initialized) {
+ nrf_uart_disable(UART_INSTANCE);
+ nrf_uart_int_disable(UART_INSTANCE, NRF_UART_INT_MASK_RXDRDY |
+ NRF_UART_INT_MASK_TXDRDY |
+ NRF_UART_INT_MASK_ERROR);
+ nrf_drv_common_irq_disable(UART_IRQn);
+ UART_CB.initialized = false;
+
+ // There is only one UART instance, thus at this point the stdio UART
+ // can no longer be initialized.
+ stdio_uart_inited = 0;
+ }
+}
+
+void serial_baud(serial_t *obj, int baudrate)
+{
+ // nrf_uart_baudrate_set() is not used here (registers are accessed
+ // directly) to make it possible to set special baud rates like 56000
+ // or 31250.
+
+ static uint32_t const acceptedSpeeds[][2] = {
+ { 1200, UART_BAUDRATE_BAUDRATE_Baud1200 },
+ { 2400, UART_BAUDRATE_BAUDRATE_Baud2400 },
+ { 4800, UART_BAUDRATE_BAUDRATE_Baud4800 },
+ { 9600, UART_BAUDRATE_BAUDRATE_Baud9600 },
+ { 14400, UART_BAUDRATE_BAUDRATE_Baud14400 },
+ { 19200, UART_BAUDRATE_BAUDRATE_Baud19200 },
+ { 28800, UART_BAUDRATE_BAUDRATE_Baud28800 },
+ { 31250, (0x00800000UL) /* 31250 baud */ },
+ { 38400, UART_BAUDRATE_BAUDRATE_Baud38400 },
+ { 56000, (0x00E51000UL) /* 56000 baud */ },
+ { 57600, UART_BAUDRATE_BAUDRATE_Baud57600 },
+ { 76800, UART_BAUDRATE_BAUDRATE_Baud76800 },
+ { 115200, UART_BAUDRATE_BAUDRATE_Baud115200 },
+ { 230400, UART_BAUDRATE_BAUDRATE_Baud230400 },
+ { 250000, UART_BAUDRATE_BAUDRATE_Baud250000 },
+ { 460800, UART_BAUDRATE_BAUDRATE_Baud460800 },
+ { 921600, UART_BAUDRATE_BAUDRATE_Baud921600 },
+ { 1000000, UART_BAUDRATE_BAUDRATE_Baud1M }
+ };
+
+ if (baudrate <= 1200) {
+ UART_INSTANCE->BAUDRATE = UART_BAUDRATE_BAUDRATE_Baud1200;
+ return;
+ }
+
+ int const item_cnt = sizeof(acceptedSpeeds)/sizeof(acceptedSpeeds[0]);
+ for (int i = 1; i < item_cnt; i++) {
+ if ((uint32_t)baudrate < acceptedSpeeds[i][0]) {
+ UART_INSTANCE->BAUDRATE = acceptedSpeeds[i - 1][1];
+ return;
+ }
+ }
+
+ UART_INSTANCE->BAUDRATE = UART_BAUDRATE_BAUDRATE_Baud1M;
+}
+
+void serial_format(serial_t *obj,
+ int data_bits, SerialParity parity, int stop_bits)
+{
+ (void)obj;
+
+ if (data_bits != 8) {
+ error("UART supports only 8 data bits.\r\n");
+ }
+ if (stop_bits != 1) {
+ error("UART supports only 1 stop bits.\r\n");
+ }
+ if (parity == ParityNone) {
+ UART_CB.parity = NRF_UART_PARITY_EXCLUDED;
+ } else if (parity == ParityEven) {
+ UART_CB.parity = NRF_UART_PARITY_INCLUDED;
+ } else {
+ error("UART supports only even parity.\r\n");
+ }
+
+ // Reconfigure UART peripheral.
+ nrf_uart_configure(UART_INSTANCE, UART_CB.parity, UART_CB.hwfc);
+}
+
+void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id)
+{
+ (void)obj;
+ UART_CB.irq_handler = handler;
+ UART_CB.irq_context = id;
+}
+
+void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable)
+{
+ (void)obj;
+ if (enable) {
+ switch (irq) {
+ case RxIrq:
+ #if DEVICE_SERIAL_ASYNCH
+ UART_CB.irq_enabled |= UART_IRQ_RX;
+ #endif
+ nrf_uart_int_enable(UART_INSTANCE, NRF_UART_INT_MASK_RXDRDY);
+ break;
+
+ case TxIrq:
+ #if DEVICE_SERIAL_ASYNCH
+ UART_CB.irq_enabled |= UART_IRQ_TX;
+ #endif
+ nrf_uart_int_enable(UART_INSTANCE, NRF_UART_INT_MASK_TXDRDY);
+ break;
+ }
+ } else {
+ switch (irq) {
+ case RxIrq:
+ #if DEVICE_SERIAL_ASYNCH
+ UART_CB.irq_enabled &= ~UART_IRQ_RX;
+ if (!UART_CB.rx_active)
+ #endif
+ {
+ nrf_uart_int_disable(UART_INSTANCE,
+ NRF_UART_INT_MASK_RXDRDY);
+ }
+ break;
+
+ case TxIrq:
+ #if DEVICE_SERIAL_ASYNCH
+ UART_CB.irq_enabled &= ~UART_IRQ_TX;
+ if (!UART_CB.tx_active)
+ #endif
+ {
+ nrf_uart_int_disable(UART_INSTANCE,
+ NRF_UART_INT_MASK_TXDRDY);
+ }
+ break;
+ }
+ }
+}
+
+int serial_getc(serial_t *obj)
+{
+ while (!serial_readable(obj)) {
+ }
+
+ nrf_uart_event_clear(UART_INSTANCE, NRF_UART_EVENT_RXDRDY);
+ return nrf_uart_rxd_get(UART_INSTANCE);
+}
+
+void serial_putc(serial_t *obj, int c)
+{
+ while (!serial_writable(obj)) {
+ }
+
+ nrf_uart_event_clear(UART_INSTANCE, NRF_UART_EVENT_TXDRDY);
+ nrf_uart_txd_set(UART_INSTANCE, (uint8_t)c);
+}
+
+int serial_readable(serial_t *obj)
+{
+ (void)obj;
+#if DEVICE_SERIAL_ASYNCH
+ if (UART_CB.rx_active) {
+ return 0;
+ }
+#endif
+ return (nrf_uart_event_check(UART_INSTANCE, NRF_UART_EVENT_RXDRDY));
+}
+
+int serial_writable(serial_t *obj)
+{
+ (void)obj;
+#if DEVICE_SERIAL_ASYNCH
+ if (UART_CB.tx_active) {
+ return 0;
+ }
+#endif
+ return (nrf_uart_event_check(UART_INSTANCE, NRF_UART_EVENT_TXDRDY));
+}
+
+void serial_break_set(serial_t *obj)
+{
+ (void)obj;
+ nrf_uart_task_trigger(UART_INSTANCE, NRF_UART_TASK_SUSPEND);
+ nrf_uart_txrx_pins_disconnect(UART_INSTANCE);
+ nrf_gpio_pin_clear(UART_CB.pseltxd);
+}
+
+void serial_break_clear(serial_t *obj)
+{
+ (void)obj;
+ nrf_gpio_pin_set(UART_CB.pseltxd);
+ nrf_uart_txrx_pins_set(UART_INSTANCE, UART_CB.pseltxd, UART_CB.pselrxd);
+ nrf_uart_task_trigger(UART_INSTANCE, NRF_UART_TASK_STARTRX);
+ nrf_uart_task_trigger(UART_INSTANCE, NRF_UART_TASK_STARTTX);
+}
+
+
+static void internal_set_hwfc(FlowControl type,
+ PinName rxflow, PinName txflow)
+{
+ UART_CB.pselrts =
+ ((rxflow == NC) || (type == FlowControlCTS)) ? NRF_UART_PSEL_DISCONNECTED : (uint32_t)rxflow;
+ UART_CB.pselcts =
+ ((txflow == NC) || (type == FlowControlRTS)) ? NRF_UART_PSEL_DISCONNECTED : (uint32_t)txflow;
+
+ if (UART_CB.pselrts != NRF_UART_PSEL_DISCONNECTED) {
+ nrf_gpio_pin_set(UART_CB.pselrts);
+ nrf_gpio_cfg_output(UART_CB.pselrts);
+ }
+ if (UART_CB.pselcts != NRF_UART_PSEL_DISCONNECTED) {
+ nrf_gpio_cfg_input(UART_CB.pselcts, NRF_GPIO_PIN_NOPULL);
+ }
+
+ UART_CB.hwfc = (type == FlowControlNone)? NRF_UART_HWFC_DISABLED : UART0_CONFIG_HWFC;
+
+ nrf_uart_configure(UART_INSTANCE, UART_CB.parity, UART_CB.hwfc);
+ nrf_uart_hwfc_pins_set(UART_INSTANCE, UART_CB.pselrts, UART_CB.pselcts);
+}
+
+void serial_set_flow_control(serial_t *obj, FlowControl type,
+ PinName rxflow, PinName txflow)
+{
+ (void)obj;
+
+ nrf_uart_disable(UART_INSTANCE);
+ internal_set_hwfc(type, rxflow, txflow);
+ nrf_uart_enable(UART_INSTANCE);
+}
+
+
+void serial_clear(serial_t *obj) {
+ (void)obj;
+}
+
+#if DEVICE_SERIAL_ASYNCH
+
+int serial_tx_asynch(serial_t *obj, const void *tx, size_t tx_length,
+ uint8_t tx_width, uint32_t handler, uint32_t event,
+ DMAUsage hint)
+{
+ (void)obj;
+ (void)tx_width;
+ (void)hint;
+ if (UART_CB.tx_active || !tx_length) {
+ return 0;
+ }
+
+ UART_CB.tx_buffer = tx;
+ UART_CB.tx_length = tx_length;
+ UART_CB.tx_pos = 0;
+ UART_CB.tx_asynch_handler = (void(*)())handler;
+ UART_CB.events_wanted &= ~SERIAL_EVENT_TX_ALL;
+ UART_CB.events_wanted |= event;
+
+ UART_CB.tx_active = true;
+ nrf_uart_int_enable(UART_INSTANCE, NRF_UART_INT_MASK_TXDRDY);
+
+ return 0;
+}
+
+void serial_rx_asynch(serial_t *obj, void *rx, size_t rx_length,
+ uint8_t rx_width, uint32_t handler, uint32_t event,
+ uint8_t char_match, DMAUsage hint)
+{
+ (void)obj;
+ (void)rx_width;
+ (void)hint;
+ if (UART_CB.rx_active || !rx_length) {
+ return;
+ }
+
+ UART_CB.rx_buffer = rx;
+ UART_CB.rx_length = rx_length;
+ UART_CB.rx_pos = 0;
+ UART_CB.rx_asynch_handler = (void(*)())handler;
+ UART_CB.events_wanted &= ~SERIAL_EVENT_RX_ALL;
+ UART_CB.events_wanted |= event;
+ UART_CB.char_match = char_match;
+
+ UART_CB.rx_active = true;
+ nrf_uart_int_enable(UART_INSTANCE, NRF_UART_INT_MASK_RXDRDY);
+}
+
+uint8_t serial_tx_active(serial_t *obj)
+{
+ (void)obj;
+ return UART_CB.tx_active;
+}
+
+uint8_t serial_rx_active(serial_t *obj)
+{
+ (void)obj;
+ return UART_CB.rx_active;
+}
+
+int serial_irq_handler_asynch(serial_t *obj)
+{
+ (void)obj;
+ uint32_t events_to_report = UART_CB.events_wanted & UART_CB.events_occured;
+ UART_CB.events_occured &= (~events_to_report);
+ return events_to_report;
+}
+
+void serial_tx_abort_asynch(serial_t *obj)
+{
+ (void)obj;
+ end_asynch_tx();
+ UART_CB.tx_asynch_handler = NULL;
+}
+
+void serial_rx_abort_asynch(serial_t *obj)
+{
+ (void)obj;
+ end_asynch_rx();
+ UART_CB.rx_asynch_handler = NULL;
+}
+
+#endif // DEVICE_SERIAL_ASYNCH
+
+#endif // DEVICE_SERIAL