gd32f103 can通信配置
时间: 2023-09-08 22:16:28 浏览: 585
要配置 GD32F103 的 CAN 通信,需要执行以下步骤:
1. 配置 CAN 控制器的时钟,使其与系统时钟同步。可以使用 RCC_ClockFreqTypeDef 结构体来配置 CAN 的时钟。例如,将 CAN 的时钟设置为系统时钟的 1/2:
```
RCC_ClockFreqTypeDef RCC_Clocks;
RCC_GetClocksFreq(&RCC_Clocks);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN, ENABLE);
CAN_InitStructure.CAN_Prescaler = (uint16_t)(RCC_Clocks.PCLK1_Frequency / 2 / 500000);
```
2. 配置 CAN 的参数,例如波特率、模式等等。可以使用 CAN_InitTypeDef 结构体来配置 CAN 的参数。例如,将 CAN 的波特率设置为 500Kbps,模式设置为正常模式:
```
CAN_InitTypeDef CAN_InitStructure;
CAN_InitStructure.CAN_TTCM = DISABLE;
CAN_InitStructure.CAN_ABOM = DISABLE;
CAN_InitStructure.CAN_AWUM = DISABLE;
CAN_InitStructure.CAN_NART = ENABLE;
CAN_InitStructure.CAN_RFLM = DISABLE;
CAN_InitStructure.CAN_TXFP = DISABLE;
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1 = CAN_BS1_8tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_7tq;
CAN_InitStructure.CAN_Prescaler = 4;
CAN_Init(CAN1, &CAN_InitStructure);
```
3. 配置 CAN 的过滤器,以便过滤出需要的 CAN 帧。可以使用 CAN_FilterInitTypeDef 结构体来配置 CAN 的过滤器。例如,设置一个过滤器来过滤出 ID 为 0x123 的 CAN 帧:
```
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 = 0x0123;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0xFFFF;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment = 0;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
```
4. 在 CAN 发送和接收数据前,需要使能 CAN 控制器:
```
CAN_Cmd(CAN1, ENABLE);
```
5. 发送数据时,需要使用 CAN_TxMsg 结构体来定义要发送的 CAN 帧。例如,发送一个 ID 为 0x123 的 CAN 帧,数据为 "Hello World":
```
CAN_TxMsg TxMessage;
TxMessage.StdId = 0x123;
TxMessage.ExtId = 0x00;
TxMessage.RTR = CAN_RTR_DATA;
TxMessage.IDE = CAN_ID_STD;
TxMessage.DLC = 11;
TxMessage.Data[0] = 'H';
TxMessage.Data[1] = 'e';
TxMessage.Data[2] = 'l';
TxMessage.Data[3] = 'l';
TxMessage.Data[4] = 'o';
TxMessage.Data[5] = ' ';
TxMessage.Data[6] = 'W';
TxMessage.Data[7] = 'o';
TxMessage.Data[8] = 'r';
TxMessage.Data[9] = 'l';
TxMessage.Data[10] = 'd';
CAN_Transmit(CAN1, &TxMessage);
```
6. 接收数据时,需要使用 CAN_RxMsg 结构体来存储接收到的 CAN 帧。例如,接收 ID 为 0x123 的 CAN 帧:
```
CAN_RxMsg RxMessage;
CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);
if(RxMessage.StdId == 0x123)
{
// 处理接收到的数据
}
```
以上就是 GD32F103 CAN 通信的基本配置步骤。
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