#include <stm32f4_isr.h> #include "con_usart.h" volatile struct usart_desc con_usart = { .le_usart = USART1, .le_usart_irqn = USART1_IRQn, .tx_dmas = DMA2_Stream7, .tx_dma_sn = 7, .tx_dma_ch = 4, .tx_dma = DMA2, .tx_dma_irqn = DMA2_Stream7_IRQn, }; void con_usart_init() { RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_DMA2EN; RCC->APB2ENR |= RCC_APB2ENR_USART1EN; /* GPIO config: A9 (TX), A10 (RX) */ GPIOA->MODER &= ~GPIO_MODER_MODER9_Msk & ~GPIO_MODER_MODER10_Msk; GPIOA->MODER |= (2<<GPIO_MODER_MODER9_Pos) | (2<<GPIO_MODER_MODER10_Pos); GPIOA->OSPEEDR &= ~GPIO_OSPEEDR_OSPEED9_Msk & ~GPIO_OSPEEDR_OSPEED10_Msk; GPIOA->OSPEEDR |= (2<<GPIO_OSPEEDR_OSPEED9_Pos) | (2<<GPIO_OSPEEDR_OSPEED10_Pos); GPIOA->AFR[1] &= ~GPIO_AFRH_AFSEL9_Msk & ~GPIO_AFRH_AFSEL10_Msk; GPIOA->AFR[1] |= (7<<GPIO_AFRH_AFSEL9_Pos) | (7<<GPIO_AFRH_AFSEL10_Pos); usart_dma_init(&con_usart, CON_USART_BAUDRATE); } void DMA2_Stream7_IRQHandler(void) { usart_dma_stream_irq(&con_usart); }