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-rw-r--r--self-test/uart-test.c34
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
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--- /dev/null
+++ b/self-test/uart-test.c
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+/*
+ * 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);
+ }
+ }
+}