首先,您需要在 MCUXpresso IDE 中创建一个 CAN 项目。根据您的开发板和微控制器型号,选择相应的 SDK 和驱动程序支持包。您需要确保正确设置时钟和引脚。
在代码中,您需要配置 CAN 控制器的位速率、数据位数等。如果您想使用中断而不是轮询来处理接收的数据,您需要启用相应的中断标志,并创建一个中断处理程序。以下是一个示例:
``` c
#define EXAMPLE_CAN CAN0
#define RX_MESSAGE_BUFFER_NUM (1)
#define TX_MESSAGE_BUFFER_NUM (2)
volatile bool txComplete = false;
volatile bool rxComplete = false;
volatile bool isError = false;
void CAN0_IRQ0_IRQHandler(void)
{
uint32_t status = CAN_GetStatusFlag(EXAMPLE_CAN);
if (status & CAN_IR_RF0N_MASK)
{
can_message_t rxMsg;
uint8_t rxFrame[8];
/* Handle received message */
if (CAN_ReadRxMb(EXAMPLE_CAN, RX_MESSAGE_BUFFER_NUM, &rxMsg, rxFrame) == kStatus_Success)
{
/* Process received message */
rxComplete = true;
}
else
{
isError = true;
}
/* Clear flag */
CAN_ClearStatusFlag(EXAMPLE_CAN, CAN_IR_RF0N_MASK);
}
if (status & CAN_IR_TC_MASK)
{
/* Handle transmission complete */
txComplete = true;
/* Clear flag */
CAN_ClearStatusFlag(EXAMPLE_CAN, CAN_IR_TC_MASK);
}
/* Handle other interrupt flags if needed */
}
void CAN_Init(void)
{
can_general_config_t canGeneralConfig;
can_message_buffer_config_t messageBufferConfig;
/* Initialize CAN */
CAN_GetDefaultConfig(&canGeneralConfig);
canGeneralConfig.enableLoopBack = true;
CAN_Init(EXAMPLE_CAN, &canGeneralConfig, CLOCK_GetFreq(kCLOCK_Flexcomm0));
/* Configure message buffer */
CAN_SetRxMsgBuff(EXAMPLE_CAN, RX_MESSAGE_BUFFER_NUM, &messageBufferConfig);
CAN_SetTxMsgBuff(EXAMPLE_CAN, TX_MESSAGE_BUFFER_NUM, &messageBufferConfig);
/* Enable interrupts */
CAN_EnableInterrupts(EXAMPLE_CAN, CAN_IE_RF0NE_MASK | CAN_IE_TC_MASK | /* Other interrupt flags if needed */);
NVIC_SetPriority(CAN0_IRQn, 2); /* Set priority */
EnableIRQ(CAN0_IRQn);
}
void CAN_Send(void)
{
can_message_t txMsg;
uint8_t txFrame[8] = {0};
/* Fill in transmission message */
txMsg.id = 0x123;
txMsg.format = kCAN_FrameFormatStandard;
txMsg.type = kCAN_FrameTypeData;
txMsg.len = 8;
txMsg.data = txFrame;
/* Send message */
if (CAN_WriteTxMb(EXAMPLE_CAN, TX_MESSAGE_BUFFER_NUM, &txMsg) == kStatus_Success)
{
/* Wait for transmission to complete */
while (!txComplete)
{
// Wait for the flag to be set
}
txComplete = false;
}
else
{
isError = true;
}
}
void CAN_Receive(void)
{
can_message_t rxMsg;
uint8_t rxFrame[8];
/* Read received message */
if (CAN_ReadRxMb(EXAMPLE_CAN, RX_MESSAGE_BUFFER_NUM, &rxMsg, rxFrame) == kStatus_Success)
{
/* Process received message */
rxComplete = true;
}
else
{
isError = true;
}
}
int main(void)
{
/* Initialize CAN */
CAN_Init();
/* Send and receive messages */
while (1)
{
CAN_Send();
while (!rxComplete)
{
// Wait for a message to be received
}
CAN_Receive();
/* Check for errors */
if (isError)
{
// Handle error
isError = false;
}
/* Reset flags */
rxComplete = false;
}
}
```
请注意,此示例使用轮询来等待接收到的数据,直到中断发生。如果您想在中断中处理数据,您可以将轮询代码部分移动到中断处理程序中。此外,此示例使用循环发送和接收消息,因此不需要将 TX 和 RX 物理连接。要测试物理连接,请将 CAN 接收器连接到 CAN 发射器,并尝试发送和接收消息。
首先,您需要在 MCUXpresso IDE 中创建一个 CAN 项目。根据您的开发板和微控制器型号,选择相应的 SDK 和驱动程序支持包。您需要确保正确设置时钟和引脚。
在代码中,您需要配置 CAN 控制器的位速率、数据位数等。如果您想使用中断而不是轮询来处理接收的数据,您需要启用相应的中断标志,并创建一个中断处理程序。以下是一个示例:
``` c
#define EXAMPLE_CAN CAN0
#define RX_MESSAGE_BUFFER_NUM (1)
#define TX_MESSAGE_BUFFER_NUM (2)
volatile bool txComplete = false;
volatile bool rxComplete = false;
volatile bool isError = false;
void CAN0_IRQ0_IRQHandler(void)
{
uint32_t status = CAN_GetStatusFlag(EXAMPLE_CAN);
if (status & CAN_IR_RF0N_MASK)
{
can_message_t rxMsg;
uint8_t rxFrame[8];
/* Handle received message */
if (CAN_ReadRxMb(EXAMPLE_CAN, RX_MESSAGE_BUFFER_NUM, &rxMsg, rxFrame) == kStatus_Success)
{
/* Process received message */
rxComplete = true;
}
else
{
isError = true;
}
/* Clear flag */
CAN_ClearStatusFlag(EXAMPLE_CAN, CAN_IR_RF0N_MASK);
}
if (status & CAN_IR_TC_MASK)
{
/* Handle transmission complete */
txComplete = true;
/* Clear flag */
CAN_ClearStatusFlag(EXAMPLE_CAN, CAN_IR_TC_MASK);
}
/* Handle other interrupt flags if needed */
}
void CAN_Init(void)
{
can_general_config_t canGeneralConfig;
can_message_buffer_config_t messageBufferConfig;
/* Initialize CAN */
CAN_GetDefaultConfig(&canGeneralConfig);
canGeneralConfig.enableLoopBack = true;
CAN_Init(EXAMPLE_CAN, &canGeneralConfig, CLOCK_GetFreq(kCLOCK_Flexcomm0));
/* Configure message buffer */
CAN_SetRxMsgBuff(EXAMPLE_CAN, RX_MESSAGE_BUFFER_NUM, &messageBufferConfig);
CAN_SetTxMsgBuff(EXAMPLE_CAN, TX_MESSAGE_BUFFER_NUM, &messageBufferConfig);
/* Enable interrupts */
CAN_EnableInterrupts(EXAMPLE_CAN, CAN_IE_RF0NE_MASK | CAN_IE_TC_MASK | /* Other interrupt flags if needed */);
NVIC_SetPriority(CAN0_IRQn, 2); /* Set priority */
EnableIRQ(CAN0_IRQn);
}
void CAN_Send(void)
{
can_message_t txMsg;
uint8_t txFrame[8] = {0};
/* Fill in transmission message */
txMsg.id = 0x123;
txMsg.format = kCAN_FrameFormatStandard;
txMsg.type = kCAN_FrameTypeData;
txMsg.len = 8;
txMsg.data = txFrame;
/* Send message */
if (CAN_WriteTxMb(EXAMPLE_CAN, TX_MESSAGE_BUFFER_NUM, &txMsg) == kStatus_Success)
{
/* Wait for transmission to complete */
while (!txComplete)
{
// Wait for the flag to be set
}
txComplete = false;
}
else
{
isError = true;
}
}
void CAN_Receive(void)
{
can_message_t rxMsg;
uint8_t rxFrame[8];
/* Read received message */
if (CAN_ReadRxMb(EXAMPLE_CAN, RX_MESSAGE_BUFFER_NUM, &rxMsg, rxFrame) == kStatus_Success)
{
/* Process received message */
rxComplete = true;
}
else
{
isError = true;
}
}
int main(void)
{
/* Initialize CAN */
CAN_Init();
/* Send and receive messages */
while (1)
{
CAN_Send();
while (!rxComplete)
{
// Wait for a message to be received
}
CAN_Receive();
/* Check for errors */
if (isError)
{
// Handle error
isError = false;
}
/* Reset flags */
rxComplete = false;
}
}
```
请注意,此示例使用轮询来等待接收到的数据,直到中断发生。如果您想在中断中处理数据,您可以将轮询代码部分移动到中断处理程序中。此外,此示例使用循环发送和接收消息,因此不需要将 TX 和 RX 物理连接。要测试物理连接,请将 CAN 接收器连接到 CAN 发射器,并尝试发送和接收消息。
举报