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74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
#include <stm32f4xx_rcc.h>
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#include <stm32f4xx_gpio.h>
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#include <stm32f4xx_usart.h>
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#include "usart.h"
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#include "systick.h"
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void usart_init(int baudrate)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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USART_InitTypeDef USART_InitStructure;
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/* enable peripheral clock for USART3 */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
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/* GPIOD clock enable */
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
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/* GPIOA Configuration: USART3 TX on PD8/9 */
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9;
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GPIO_Init(GPIOD, &GPIO_InitStructure);
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/* Connect USART3 pins to AF2 */
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GPIO_PinAFConfig(GPIOD, GPIO_PinSource8, GPIO_AF_USART3);
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GPIO_PinAFConfig(GPIOD, GPIO_PinSource9, GPIO_AF_USART3);
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/* Disable USART */
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USART_Cmd(USART3, DISABLE);
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systick_sleep(10);
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USART_DeInit(USART3);
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systick_sleep(10);
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USART_InitStructure.USART_BaudRate = baudrate;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Tx|USART_Mode_Rx;
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USART_Init(USART3, &USART_InitStructure);
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USART_Cmd(USART3, ENABLE); // enable USART3
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}
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void usart_set_baudrate(int baudrate)
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{
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USART_InitTypeDef USART_InitStructure;
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USART_InitStructure.USART_BaudRate = baudrate;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Tx|USART_Mode_Rx;
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USART_Init(USART3, &USART_InitStructure);
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USART_Cmd(USART3, ENABLE); // enable USART3
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}
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void usart_send(uint8_t byte)
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{
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USART_SendData(USART3, byte);
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while (!USART_GetFlagStatus(USART3, USART_FLAG_TXE));
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}
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uint8_t usart_recv()
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{
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return USART_ReceiveData(USART3);
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}
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