1 files changed, 34 insertions, 0 deletions
diff --git a/self-test/uart-test.c b/self-test/uart-test.c
new file mode 100644
index 0000000..8fe7795
--- /dev/null
+++ b/self-test/uart-test.c
@@ -0,0 +1,34 @@
+/*
+ * Test code that just sends the letters 'a' to 'z' over and
+ * over again using USART2.
+ *
+ * Toggles the BLUE LED slowly and the RED LED for every
+ * character sent.
+ */
+#include "stm32f4xx_hal.h"
+#include "stm-init.h"
+#include "stm-led.h"
+#include "stm-uart.h"
+
+#define DELAY() HAL_Delay(100)
+
+int
+main()
+{
+  uint8_t c = 'a';
+
+  stm_init();
+
+  while (1)
+  {
+    HAL_GPIO_TogglePin(LED_PORT, LED_RED);
+
+    uart_send_char(c);
+    DELAY();
+
+    if (c++ == 'z') {
+      c = 'a';
+      HAL_GPIO_TogglePin(LED_PORT, LED_BLUE);
+    }
+  }
+}