STM32F103使用CAN通信读取多个扩展帧命令,并将命令进行解析
时间: 2024-01-11 20:03:05 浏览: 211
首先,需要初始化CAN模块,设置CAN的波特率、过滤器、中断等参数。在读取扩展帧命令时,可以使用CAN接收中断来实现。
在中断服务函数中,首先需要判断接收到的帧是否是扩展帧。如果是扩展帧,则可以根据帧ID进行解析。一种常见的解析方法是使用switch-case语句,对不同的帧ID进行不同的处理。
例如,如果帧ID为0x12345678,则可以进行如下处理:
1. 读取数据长度和数据内容
2. 判断数据内容是否为特定的命令,例如0x01表示打开某个设备,0x02表示关闭某个设备
3. 根据命令进行相应的操作
另外,如果需要同时读取多个扩展帧命令,可以使用循环来实现。在循环中,可以使用标志位来判断是否已经读取到所有需要的帧。
总的来说,CAN通信读取多个扩展帧命令并进行解析,需要对CAN模块进行初始化设置,并使用中断来实现帧的接收和解析。需要根据不同的帧ID进行不同的处理,并使用循环来读取多个命令。
相关问题
STM32F103使用CAN通信读取多个扩展帧命令,并将命令进行解析
要在STM32F103上使用CAN通信读取多个扩展帧命令并解析它们,您需要按照以下步骤进行操作:
1. 初始化CAN总线。这包括设置CAN的波特率、模式和过滤器等。
2. 启动CAN总线。这将使CAN总线开始接收数据。
3. 在CAN总线上等待数据。使用轮询或中断等方法等待CAN数据的到来。
4. 从CAN缓冲区读取数据。一旦收到CAN数据,您可以从CAN缓冲区读取它们。
5. 解析CAN数据。解析CAN数据包括解析标识符、数据长度和数据等。
6. 重复步骤3到步骤5,以读取并解析多个CAN数据帧。
以下是一个简单的示例代码,用于读取并解析多个扩展帧命令:
```c
#include "stm32f10x.h"
#include "stm32f10x_can.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#define CAN_RX_PIN GPIO_Pin_11
#define CAN_TX_PIN GPIO_Pin_12
void CAN_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Configure CAN RX and TX pins */
GPIO_InitStructure.GPIO_Pin = CAN_RX_PIN | CAN_TX_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Enable CAN clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
/* Configure CAN */
CAN_InitStructure.CAN_TTCM = DISABLE;
CAN_InitStructure.CAN_ABOM = DISABLE;
CAN_InitStructure.CAN_AWUM = DISABLE;
CAN_InitStructure.CAN_NART = DISABLE;
CAN_InitStructure.CAN_RFLM = DISABLE;
CAN_InitStructure.CAN_TXFP = ENABLE;
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1 = CAN_BS1_6tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_8tq;
CAN_InitStructure.CAN_Prescaler = 4;
CAN_Init(CAN1, &CAN_InitStructure);
/* Configure CAN filter */
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);
}
void CAN_Read_And_Parse_Multiple_Messages(void)
{
CanRxMsg RxMessage;
while (1)
{
/* Wait for CAN message */
while (CAN_MessagePending(CAN1, CAN_FIFO0) == 0);
/* Read CAN message */
CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);
/* Parse CAN message */
uint32_t id = RxMessage.ExtId;
uint8_t length = RxMessage.DLC;
uint8_t data[8];
for (int i = 0; i < length; i++)
{
data[i] = RxMessage.Data[i];
}
/* Process CAN message */
switch (id)
{
case 0x12345678:
/* Handle message with ID 0x12345678 */
break;
case 0x87654321:
/* Handle message with ID 0x87654321 */
break;
default:
/* Unknown message ID */
break;
}
}
}
int main(void)
{
/* Configure CAN */
CAN_Configuration();
/* Read and parse multiple CAN messages */
CAN_Read_And_Parse_Multiple_Messages();
return 0;
}
```
STM32F103使用CAN通信读取多个扩展帧命令,并将命令按照字节进行解析
首先需要初始化CAN模块并设置CAN的波特率、模式等参数。然后需要配置CAN过滤器,以过滤出需要接收的扩展帧命令。
接收到数据后,可以通过CAN接收中断来处理数据。在中断处理函数中,可以通过CAN的数据结构体来获取接收到的数据。
接收到的数据需要按字节进行解析。可以将数据存储在一个缓冲区中,然后逐个字节进行解析。解析时需要根据协议规定的数据格式进行解析,并将解析结果存储在相应的变量中。
以下是一个示例代码,用于接收并解析两个扩展帧命令:
```c
#include "stm32f10x.h"
CAN_InitTypeDef CAN_InitStruct;
CAN_FilterInitTypeDef CAN_FilterInitStruct;
CanRxMsg RxMessage;
uint8_t buffer[8];
uint8_t command1, command2;
void CAN_Config(void)
{
// 初始化CAN模块
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
CAN_InitStruct.CAN_TTCM = DISABLE;
CAN_InitStruct.CAN_ABOM = DISABLE;
CAN_InitStruct.CAN_AWUM = DISABLE;
CAN_InitStruct.CAN_NART = ENABLE;
CAN_InitStruct.CAN_RFLM = DISABLE;
CAN_InitStruct.CAN_TXFP = DISABLE;
CAN_InitStruct.CAN_Mode = CAN_Mode_Normal;
CAN_InitStruct.CAN_SJW = CAN_SJW_1tq;
CAN_InitStruct.CAN_BS1 = CAN_BS1_9tq;
CAN_InitStruct.CAN_BS2 = CAN_BS2_4tq;
CAN_InitStruct.CAN_Prescaler = 2;
CAN_Init(CAN1, &CAN_InitStruct);
// 配置CAN过滤器
CAN_FilterInitStruct.CAN_FilterNumber = 0;
CAN_FilterInitStruct.CAN_FilterMode = CAN_FilterMode_IdMask;
CAN_FilterInitStruct.CAN_FilterScale = CAN_FilterScale_32bit;
CAN_FilterInitStruct.CAN_FilterIdHigh = 0x0000;
CAN_FilterInitStruct.CAN_FilterIdLow = 0x0000;
CAN_FilterInitStruct.CAN_FilterMaskIdHigh = 0x0000;
CAN_FilterInitStruct.CAN_FilterMaskIdLow = 0x0000;
CAN_FilterInitStruct.CAN_FilterFIFOAssignment = CAN_Filter_FIFO0;
CAN_FilterInitStruct.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStruct);
// 使能CAN接收中断
NVIC_InitTypeDef NVIC_InitStruct;
NVIC_InitStruct.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);
}
void USB_LP_CAN1_RX0_IRQHandler(void)
{
CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);
if (RxMessage.IDE == CAN_Id_Extended)
{
// 解析命令1
if (RxMessage.ExtId == 0x12345678)
{
buffer[0] = RxMessage.Data[0];
buffer[1] = RxMessage.Data[1];
buffer[2] = RxMessage.Data[2];
buffer[3] = RxMessage.Data[3];
command1 = buffer[0];
}
// 解析命令2
else if (RxMessage.ExtId == 0x87654321)
{
buffer[0] = RxMessage.Data[0];
buffer[1] = RxMessage.Data[1];
buffer[2] = RxMessage.Data[2];
buffer[3] = RxMessage.Data[3];
command2 = buffer[0];
}
}
}
int main(void)
{
CAN_Config();
while (1) {}
}
```
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