wip

build/main.i

@@ -2298,6 +2298,15 @@ struct usart {
 
 
 
+#define USART_SR_TXE_BIT 7
+#define USART_SR_TXE_TRANSMITTED (1 << USART_SR_TXE_BIT)
+
+
+#define USART_SR_RXNE_BIT 5
+#define USART_SR_RXNE_READY (1 <<USART_SR_RXNE_BIT)
+
+
+
 #define USART_CR1_OVER8_BIT 15
 #define USART_CR1_OVER8_8 (1 << USART_CR1_OVER8_BIT)
 
@@ -2322,6 +2331,8 @@ struct usart {
 
 void usart2_init(void);
 void usart2_start(void);
+
+void usart2_write_byte(char byte);
 # 10 "src/main.c" 2
 
 #define exit 42
@@ -2396,7 +2407,7 @@ int main(void) {
   (void) usart2_init();
 
   (void) tim4_start();
-  (void) tim4_start();
+  (void) usart2_start();
 
   uint16_t led = (((('C') - 'A') << 8) | 13);
   ((struct rcc *) (0x40023800U))->AHB1ENR |= (1 << (led >> 8));
@@ -2417,6 +2428,8 @@ int main(void) {
   led_on = !led_on;
   gpio_write(led, led_on);
 
+  usart2_write_byte('a');
+
   counter = ((struct timer *) (0x40000800U))->CNT;
  }
   };