hello world over usb serial done

1 files changed, 51 insertions, 1 deletions

diff --git a/stm32/main.c b/stm32/main.c
index 4722fe0..14b2a41 100644
--- a/stm32/main.c
+++ b/stm32/main.c
@@ -1,3 +1,53 @@
+#include <stm32f0xx_hal.h>
+#include <stm32f0xx_hal_uart.h>
+
+void error_handler() {
+	__disable_irq();
+	for(;;);
+}
+
+UART_HandleTypeDef huart2 = {
+	.Instance = USART2,
+	.Init.BaudRate = 115200,
+	.Init.WordLength = UART_WORDLENGTH_8B,
+	.Init.StopBits = UART_STOPBITS_1,
+	.Init.Parity = UART_PARITY_NONE,
+	.Init.Mode = UART_MODE_TX_RX,
+	.Init.HwFlowCtl = UART_HWCONTROL_NONE,
+	.Init.OverSampling = UART_OVERSAMPLING_16,
+	.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE,
+	.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT,
+};
+
+void HAL_MspInit() {
+  __HAL_RCC_SYSCFG_CLK_ENABLE();
+  __HAL_RCC_PWR_CLK_ENABLE();
+}
+
+void HAL_UART_MspInit(UART_HandleTypeDef *huart) {
+	if (huart->Instance != USART2) return;
+
+	__HAL_RCC_USART2_CLK_ENABLE();
+	__HAL_RCC_GPIOA_CLK_ENABLE();
+	HAL_GPIO_Init(GPIOA, &(GPIO_InitTypeDef) {
+		.Pin = GPIO_PIN_2 | GPIO_PIN_3,
+		.Mode = GPIO_MODE_AF_PP,
+		.Pull = GPIO_NOPULL,
+		.Speed = GPIO_SPEED_FREQ_LOW,
+		.Alternate = GPIO_AF1_USART2,
+	});
+}
+
+void setup() {
+	if (HAL_UART_Init(&huart2) != HAL_OK)
+		return error_handler();
+}
+
 int main() {
-	while (1);
+	setup();
+
+	const char test_data[] = "hello world!\r\n";
+	HAL_UART_Transmit(&huart2, (uint8_t*) test_data, sizeof(test_data), 100);
+
+	while(1);
 }