Tweet
Mình đã sửa lại HSE_VALUE trong stm32f4xx.h là 8000000.
Còn đây là code UART gửi 1 chuỗi lên máy tính. Có tín hiệu gửi lên nhưng ko phải là HelloWorld.
Còn đây là code UART gửi 1 chuỗi lên máy tính. Có tín hiệu gửi lên nhưng ko phải là HelloWorld.
Code:
#include <stm32f4xx.h>
#include <misc.h>
#include <stm32f4xx_usart.h>
void init_USART1(uint32_t baudrate){
GPIO_InitTypeDef GPIO_InitStruct;
USART_InitTypeDef USART_InitStruct;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; // Pins 6 (TX) and 7 (RX) are used
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStruct);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1); //
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1);
USART_InitStruct.USART_BaudRate = baudrate;
USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_InitStruct.USART_StopBits = USART_StopBits_1;
USART_InitStruct.USART_Parity = USART_Parity_No;
USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_Init(USART1, &USART_InitStruct);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_Cmd(USART1, ENABLE);
}
void sendstring(char* string)
{
while(*string !='\0')
{
USART_SendData(USART1,*string);
string++;
while(USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET)
{};
}
}
int main(void) {
while(1){
init_USART1(9600); //USART1 @ 9600 baud
sendstring("HelloWorld");
}
}
Comment