diff --git a/uart.c b/uart.c
new file mode 100644
index 0000000..9947a18
--- /dev/null
+++ b/uart.c
@@ -0,0 +1,19 @@
+#include <libopencm3/stm32/usart.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+
+static void usart_setup(void) {
+    rcc_periph_clock_enable(RCC_GPIOA);
+    rcc_periph_clock_enable(RCC_USART1);
+
+    // Set PA9 (TX) to alternate function, push-pull
+    gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
+
+    usart_set_baudrate(USART1, 115200);
+    usart_set_databits(USART1, 8);
+    usart_set_stopbits(USART1, USART_STOPBITS_1);
+    usart_set_mode(USART1, USART_MODE_TX);
+    usart_set_parity(USART1, USART_PARITY_NONE);
+    usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+    usart_enable(USART1);
+}