TC397设置CAN的接收缓冲区Rx Buffer Elements的数量怎么做
时间: 2024-04-06 07:31:24 浏览: 13
TC397是一款基于ARM Cortex-M3内核的微控制器,它采用了FlexCAN控制器来实现CAN通信。要设置CAN的接收缓冲区Rx Buffer Elements的数量,可以按照以下步骤进行:
1. 打开FlexCAN控制器的时钟,使能FlexCAN模块;
2. 配置CAN控制器的工作模式、波特率、接收模式等参数;
3. 配置CAN控制器的接收缓冲区Rx Buffer Elements的数量,可以通过设置CAN控制器的MCR寄存器中的MAXMB字段来实现。MAXMB字段的值表示接收缓冲区的数量,可以根据实际需要进行设置;
4. 配置CAN控制器的接收缓冲区过滤器,以过滤不需要的数据帧;
5. 启动CAN控制器,开始接收CAN数据帧。
需要注意的是,不同型号的微控制器可能会有所不同,具体的设置方法需要参考相应的技术文档或参考代码。
相关问题
TC397如何设置CAN的Rx Buffer elements的数量
要设置CAN的Rx Buffer elements的数量,可以按照以下步骤进行:
1. 打开TC397的CAN控制器的配置寄存器CAN_CON。
2. 在CAN_CON中设置RM(Receive Buffer Mode)位为1,以启用接收缓冲区。
3. 根据需要设置CAN控制器的接收缓冲区大小。可以通过设置CAN_CON中的RB(Receive Buffer)位来选择缓冲区大小,也可以通过设置CAN_CON中的BM(Buffer Mode)位来选择不同的缓冲区大小。
4. 根据需要设置CAN控制器的Rx Buffer elements的数量。可以通过设置CAN_CON中的REB(Rx Buffer Elements)位来选择缓冲区中Rx Buffer elements的数量。
注意:不同的TC397型号和不同的配置可能会导致CAN控制器和缓冲区的设置不同。因此,请参考相关的TC397文档或咨询相关的技术支持人员,以确保正确设置CAN控制器的Rx Buffer elements的数量。
TC397同时接收多个不同ID的CAN信号的具体代码
以下是一个基于STM32的CAN接收多个不同ID的信号的示例代码:
```
#include "stm32f4xx.h"
#include "stm32f4xx_can.h"
#define CANx CAN1
#define CAN_CLK RCC_APB1Periph_CAN1
#define CAN_RX_PIN GPIO_Pin_0
#define CAN_TX_PIN GPIO_Pin_1
#define CAN_GPIO_PORT GPIOD
#define CAN_GPIO_CLK RCC_AHB1Periph_GPIOD
/* CAN filter parameters */
#define CAN_FILTER_FIFO CAN_FilterFIFO0
#define CAN_FILTER_MODE CAN_FilterMode_IdMask
#define CAN_FILTER_SCALE CAN_FilterScale_32bit
#define CAN_FILTER_ACTIVATION ENABLE
#define CAN_FILTER_ID_LOW 0x0000
#define CAN_FILTER_ID_HIGH 0x0000
#define CAN_FILTER_MASK_LOW 0x0000
#define CAN_FILTER_MASK_HIGH 0x0000
#define CAN_FILTER_FIFO_ASSIGNMENT 0
void CAN_Config(void);
void NVIC_Config(void);
void CAN_Filter_Config(void);
void CAN_RxMessage_Handler(CanRxMsg *RxMessage);
int main(void)
{
/* CAN configuration */
CAN_Config();
NVIC_Config();
CAN_Filter_Config();
while (1);
}
void CAN_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
/* Enable CAN GPIO clocks */
RCC_AHB1PeriphClockCmd(CAN_GPIO_CLK, ENABLE);
/* Configure CAN RX and TX pins */
GPIO_InitStructure.GPIO_Pin = CAN_RX_PIN | CAN_TX_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(CAN_GPIO_PORT, &GPIO_InitStructure);
/* Connect CAN RX and TX pins to AF9 */
GPIO_PinAFConfig(CAN_GPIO_PORT, GPIO_PinSource0, GPIO_AF_CAN1);
GPIO_PinAFConfig(CAN_GPIO_PORT, GPIO_PinSource1, GPIO_AF_CAN1);
/* Enable CAN clock */
RCC_APB1PeriphClockCmd(CAN_CLK, ENABLE);
/* CAN register init */
CAN_DeInit(CANx);
/* CAN cell init */
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 = DISABLE;
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1 = CAN_BS1_9tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
CAN_InitStructure.CAN_Prescaler = 4;
CAN_Init(CANx, &CAN_InitStructure);
}
void NVIC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable CAN RX interrupts */
NVIC_InitStructure.NVIC_IRQChannel = CAN1_RX0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void CAN_Filter_Config(void)
{
CAN_FilterInitTypeDef CAN_FilterInitStructure;
/* CAN filter init */
CAN_FilterInitStructure.CAN_FilterNumber = 0;
CAN_FilterInitStructure.CAN_FilterMode = CAN_FILTER_MODE;
CAN_FilterInitStructure.CAN_FilterScale = CAN_FILTER_SCALE;
CAN_FilterInitStructure.CAN_FilterIdHigh = CAN_FILTER_ID_HIGH;
CAN_FilterInitStructure.CAN_FilterIdLow = CAN_FILTER_ID_LOW;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh = CAN_FILTER_MASK_HIGH;
CAN_FilterInitStructure.CAN_FilterMaskIdLow = CAN_FILTER_MASK_LOW;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_FILTER_FIFO_ASSIGNMENT;
CAN_FilterInitStructure.CAN_FilterActivation = CAN_FILTER_ACTIVATION;
CAN_FilterInit(&CAN_FilterInitStructure);
}
void CAN_RxMessage_Handler(CanRxMsg *RxMessage)
{
/* Handle received CAN message */
}
void CAN1_RX0_IRQHandler(void)
{
CanRxMsg RxMessage;
/* Check if FIFO0 has received a message */
if (CAN_GetITStatus(CAN1, CAN_IT_FMP0) != RESET)
{
/* Get the received message */
CAN_Receive(CAN1, CAN_FILTER_FIFO, &RxMessage);
/* Handle the received message */
CAN_RxMessage_Handler(&RxMessage);
/* Clear the FIFO0 message pending bit */
CAN_ClearITPendingBit(CAN1, CAN_IT_FMP0);
}
}
```
在CAN_Filter_Config函数中,你需要设置CAN滤波器的ID和掩码,以便只接收你需要的CAN信号。例如,如果你需要接收ID为0x100和0x200的CAN信号,则可以将CAN_FILTER_ID_LOW分别设置为0x100和0x200,将CAN_FILTER_ID_HIGH和CAN_FILTER_MASK_HIGH设置为0x0000。
在CAN_RxMessage_Handler函数中,你可以处理接收到的CAN消息。你可以根据CAN消息的ID和数据来执行不同的操作。