ChibiOS 2.6.8, until I can figure out where to get it from git.

firmware/chibios/testhal/STM32F4xx/UART/main.c

@@ -0,0 +1,163 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+    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.
+*/
+
+#include "ch.h"
+#include "hal.h"
+
+static VirtualTimer vt3, vt4, vt5;
+
+static const uint8_t message[] = "0123456789ABCDEF";
+static uint8_t buffer[16];
+
+static void led3off(void *p) {
+
+  (void)p;
+  palClearPad(GPIOD, GPIOD_LED3);
+}
+
+static void led4off(void *p) {
+
+  (void)p;
+  palClearPad(GPIOD, GPIOD_LED4);
+}
+
+static void led5off(void *p) {
+
+  (void)p;
+  palClearPad(GPIOD, GPIOD_LED5);
+}
+
+/*
+ * This callback is invoked when a transmission buffer has been completely
+ * read by the driver.
+ */
+static void txend1(UARTDriver *uartp) {
+
+  (void)uartp;
+}
+
+/*
+ * This callback is invoked when a transmission has physically completed.
+ */
+static void txend2(UARTDriver *uartp) {
+
+  (void)uartp;
+  palSetPad(GPIOD, GPIOD_LED5);
+  chSysLockFromIsr();
+  if (chVTIsArmedI(&vt5))
+    chVTResetI(&vt5);
+  chVTSetI(&vt5, MS2ST(200), led5off, NULL);
+  chSysUnlockFromIsr();
+}
+
+/*
+ * This callback is invoked on a receive error, the errors mask is passed
+ * as parameter.
+ */
+static void rxerr(UARTDriver *uartp, uartflags_t e) {
+
+  (void)uartp;
+  (void)e;
+}
+
+/*
+ * This callback is invoked when a character is received but the application
+ * was not ready to receive it, the character is passed as parameter.
+ */
+static void rxchar(UARTDriver *uartp, uint16_t c) {
+
+  (void)uartp;
+  (void)c;
+  /* Flashing the LED each time a character is received.*/
+  palSetPad(GPIOD, GPIOD_LED4);
+  chSysLockFromIsr();
+  if (chVTIsArmedI(&vt4))
+    chVTResetI(&vt4);
+  chVTSetI(&vt4, MS2ST(200), led4off, NULL);
+  chSysUnlockFromIsr();
+}
+
+/*
+ * This callback is invoked when a receive buffer has been completely written.
+ */
+static void rxend(UARTDriver *uartp) {
+
+  (void)uartp;
+
+  /* Flashing the LED each time a character is received.*/
+  palSetPad(GPIOD, GPIOD_LED3);
+  chSysLockFromIsr();
+  if (chVTIsArmedI(&vt3))
+    chVTResetI(&vt3);
+  chVTSetI(&vt3, MS2ST(200), led3off, NULL);
+  chSysUnlockFromIsr();
+}
+
+/*
+ * UART driver configuration structure.
+ */
+static UARTConfig uart_cfg_1 = {
+  txend1,
+  txend2,
+  rxend,
+  rxchar,
+  rxerr,
+  38400,
+  0,
+  USART_CR2_LINEN,
+  0
+};
+
+/*
+ * Application entry point.
+ */
+int main(void) {
+
+  /*
+   * System initializations.
+   * - HAL initialization, this also initializes the configured device drivers
+   *   and performs the board-specific initializations.
+   * - Kernel initialization, the main() function becomes a thread and the
+   *   RTOS is active.
+   */
+  halInit();
+  chSysInit();
+
+  /*
+   * Activates the UART driver 2, PA2(TX) and PA3(RX) are routed to USART2.
+   */
+  uartStart(&UARTD2, &uart_cfg_1);
+  palSetPadMode(GPIOA, 2, PAL_MODE_ALTERNATE(7));
+  palSetPadMode(GPIOA, 3, PAL_MODE_ALTERNATE(7));
+
+
+  /*
+   * Normal main() thread activity, in this demo it does nothing.
+   */
+  while (TRUE) {
+    if (palReadPad(GPIOA, GPIOA_BUTTON)) {
+      /*
+       * Starts both a transmission and a receive operations, both will be
+       * handled entirely in background.
+       */
+      uartStopReceive(&UARTD2);
+      uartStopSend(&UARTD2);
+      uartStartReceive(&UARTD2, 16, buffer);
+      uartStartSend(&UARTD2, 16, message);
+    }
+    chThdSleepMilliseconds(500);
+  }
+}