stm32f407can发送代码
时间: 2023-11-08 17:02:49 浏览: 119
以下是一个简单的STM32F407CAN发送代码示例:
```c
#include "stm32f4xx.h"
void CAN_Configuration(void);
int main(void)
{
CAN_Configuration();
while (1)
{
CAN1->sTxMailBox[0].TIR = 0x06500000; // 设置发送标识符为0x065
CAN1->sTxMailBox[0].TDLR = 0x01234567; // 设置发送数据
CAN1->sTxMailBox[0].TDTR = 0x08; // 设置发送数据长度为8位
CAN1->sTxMailBox[0].TIR |= 0x01; // 设置请求发送
while((CAN1->sTxMailBox[0].TIR & 0x01) != 0); // 等待发送完成
delay(1000); // 延时1秒后再次发送
}
}
void CAN_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
/* 使能GPIO和CAN时钟 */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
/* 配置CAN引脚 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 配置CAN */
CAN_InitStructure.CAN_ABOM = DISABLE;
CAN_InitStructure.CAN_AWUM = DISABLE;
CAN_InitStructure.CAN_BS1 = CAN_BS1_9tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_8tq;
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
CAN_InitStructure.CAN_NART = DISABLE;
CAN_InitStructure.CAN_Prescaler = 3;
CAN_InitStructure.CAN_RFLM = DISABLE;
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
CAN_Init(CAN1, &CAN_InitStructure);
/* 过滤器配置 */
CAN_FilterInitTypeDef CAN_FilterInitStructure;
CAN_FilterInitStructure.CAN_FilterNumber = 0;
CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;
CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;
CAN_FilterInitStructure.CAN_FilterIdHigh = 0x0000;
CAN_FilterInitStructure.CAN_FilterIdLow = 0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_Filter_FIFO0;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
/* 启动CAN */
CAN_Cmd(CAN1, ENABLE);
/* 等待CAN准备就绪 */
while(CAN_GetFlagStatus(CAN1, CAN_FLAG_INITOK) == RESET);
/* 进入循环模式 */
CAN1->FMR |= 0x01;
CAN1->FM1R &= 0x00;
CAN1->FS1R |= 0x00;
CAN1->FFA1R |= 0x00;
CAN1->FA1R |= 0x01;
}
```
这个代码示例的作用是配置STM32F407的CAN1发送一帧数据,发送标识符为0x065,发送的数据为0x01234567。代码首先定义了CAN和GPIO的配置函数CAN_Configuration,并在主函数中调用该函数以进行配置。
在主循环中,代码首先配置CAN1发送邮箱的标识符和数据。然后设置请求发送位,等待发送完成。完成后通过delay函数延时1秒后再次发送。
配置函数CAN_Configuration首先使能了CAN和GPIO的时钟,然后配置了CAN引脚为复用功能,设置引脚速率为100MHz。接下来,使用CAN_Init函数配置CAN的参数,设置了波特率、模式等。
然后,代码配置了CAN的过滤器,用于过滤接收到的消息。最后,启动CAN并等待初始化完成。
请注意,在使用该代码之前,需要根据实际情况进行适当修改和调整。
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