Diff: targets/TARGET_STM/serial_api.c

Revision:

0:083111ae2a11

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/serial_api.c	Thu Nov 26 04:08:56 2020 +0000
@@ -0,0 +1,160 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2015, STMicroelectronics
+ * 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 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 STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * 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 "mbed_assert.h"
+#include "mbed_error.h"
+#include "serial_api.h"
+#include "serial_api_hal.h"
+#include "PeripheralPins.h"
+
+#if DEVICE_SERIAL
+
+void init_uart(serial_t *obj)
+{
+    struct serial_s *obj_s = SERIAL_S(obj);
+    UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
+    huart->Instance = (USART_TypeDef *)(obj_s->uart);
+
+    huart->Init.BaudRate     = obj_s->baudrate;
+    huart->Init.WordLength   = obj_s->databits;
+    huart->Init.StopBits     = obj_s->stopbits;
+    huart->Init.Parity       = obj_s->parity;
+#if DEVICE_SERIAL_FC
+    huart->Init.HwFlowCtl    = obj_s->hw_flow_ctl;
+#else
+    huart->Init.HwFlowCtl    = UART_HWCONTROL_NONE;
+#endif
+    huart->Init.OverSampling = UART_OVERSAMPLING_16;
+    huart->TxXferCount       = 0;
+    huart->TxXferSize        = 0;
+    huart->RxXferCount       = 0;
+    huart->RxXferSize        = 0;
+
+    if (obj_s->pin_rx == NC) {
+        huart->Init.Mode = UART_MODE_TX;
+    } else if (obj_s->pin_tx == NC) {
+        huart->Init.Mode = UART_MODE_RX;
+    } else {
+        huart->Init.Mode = UART_MODE_TX_RX;
+    }
+
+    if (HAL_UART_Init(huart) != HAL_OK) {
+        error("Cannot initialize UART\n");
+    }
+}
+
+void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits)
+{
+    struct serial_s *obj_s = SERIAL_S(obj);
+
+    switch (parity) {
+        case ParityOdd:
+            obj_s->parity = UART_PARITY_ODD;
+            break;
+        case ParityEven:
+            obj_s->parity = UART_PARITY_EVEN;
+            break;
+        default: // ParityNone
+        case ParityForced0: // unsupported!
+        case ParityForced1: // unsupported!
+            obj_s->parity = UART_PARITY_NONE;
+            break;
+    }
+
+    switch (data_bits) {
+        case 9:
+            MBED_ASSERT(parity == UART_PARITY_NONE);
+            obj_s->databits = UART_WORDLENGTH_9B;
+            break;
+        default:
+        case 8:
+            if (parity != UART_PARITY_NONE) {
+                obj_s->databits = UART_WORDLENGTH_9B;
+            } else {
+                obj_s->databits = UART_WORDLENGTH_8B;
+            }
+            break;
+#if defined UART_WORDLENGTH_7B
+        case 7:
+            if (parity != UART_PARITY_NONE) {
+                obj_s->databits = UART_WORDLENGTH_8B;
+            } else {
+                obj_s->databits = UART_WORDLENGTH_7B;
+            }
+            break;
+#endif
+    }
+
+    if (stop_bits == 2) {
+        obj_s->stopbits = UART_STOPBITS_2;
+    } else {
+        obj_s->stopbits = UART_STOPBITS_1;
+    }
+
+    init_uart(obj);
+}
+
+/******************************************************************************
+ * READ/WRITE
+ ******************************************************************************/
+
+int serial_readable(serial_t *obj)
+{
+    struct serial_s *obj_s = SERIAL_S(obj);
+    UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
+    /*  To avoid a target blocking case, let's check for
+     *  possible OVERRUN error and discard it
+     */
+    if(__HAL_UART_GET_FLAG(huart, UART_FLAG_ORE)) {
+        __HAL_UART_CLEAR_OREFLAG(huart);
+    }
+    // Check if data is received
+    return (__HAL_UART_GET_FLAG(huart, UART_FLAG_RXNE) != RESET) ? 1 : 0;
+}
+
+int serial_writable(serial_t *obj)
+{
+    struct serial_s *obj_s = SERIAL_S(obj);
+    UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
+
+    // Check if data is transmitted
+    return (__HAL_UART_GET_FLAG(huart, UART_FLAG_TXE) != RESET) ? 1 : 0;
+}
+
+void serial_pinout_tx(PinName tx)
+{
+    pinmap_pinout(tx, PinMap_UART_TX);
+}
+
+void serial_break_clear(serial_t *obj)
+{
+    (void)obj;
+}
+
+#endif /* DEVICE_SERIAL */