[参考译文] TMS320F280049：可发送数据与 TX 引脚数据不匹配

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1383812/tms320f280049-can-transmit-data-not-match-tx-pin-data

工具与软件：

这是我的代码、当我发送 CAN 消息时、我无法从 pcanview 看到该消息。 PCanview 给我一个错误 BUSHEAVY。  

如果我在示波器中分析 TX 引脚、我将得到0x1556AAAB...  

当我从 pCAN 向 MCU 发送消息时、程序没有 RX 中断。 如果我分析 Rx 引脚、我会得到正确的消息、但 MCU 未获得该消息。

CCS 12.7.1、sysconf 1.20、 empty_driverlib_project、F28004x_64PM

我查看了 DCAN 模块的文档编程示例和调试策略。

代码在评估板 launchxl-f280049c 上正确运行。 我所做的唯一区别是更改引脚配置。

#include "driverlib.h"
#include "device.h"
#include "board.h"
#include "c2000ware_libraries.h"

#define KL_CAN_TX_OBJ_ID 1
#define KL_CAN_RX_OBJ_ID 2
#define KL_CAN_TX_MSG_ID 0x15555556
#define KL_CAN_RX_MSG_ID 0x15555555

uint16_t txMsgData[8] = {0x12, 0x34, 0x56, 0x78, 0x22, 0x74, 0x56, 0x98};
uint16_t rxMsgData[8];

__interrupt void canaISR(void);
void kl_CANInit(void);

void main(void)
{
Device_init();
Device_initGPIO();
Interrupt_initModule();
Interrupt_initVectorTable();
Board_init();
C2000Ware_libraries_init();

EALLOW;
kl_CANInit();
CAN_disableRetry(CANA_BASE);
EDIS;

EINT;
ERTM;

while(1)
{
DEVICE_DELAY_US(1000000);
CAN_sendMessage(CANA_BASE, KL_CAN_TX_OBJ_ID, 8, txMsgData);
}
}

__interrupt void canaISR(void)
{
uint32_t status;

status = CAN_getInterruptCause(CANA_BASE);
if(status == CAN_INT_INT0ID_STATUS)
{
status = CAN_getStatus(CANA_BASE);
}
else if(status == KL_CAN_TX_OBJ_ID)
{
CAN_clearInterruptStatus(CANA_BASE, KL_CAN_TX_OBJ_ID);
}
else if(status == KL_CAN_RX_OBJ_ID)
{
CAN_readMessage(CANA_BASE, KL_CAN_RX_OBJ_ID, rxMsgData);
CAN_clearInterruptStatus(CANA_BASE, KL_CAN_RX_OBJ_ID);
}
else
{

}

CAN_clearGlobalInterruptStatus(CANA_BASE, CAN_GLOBAL_INT_CANINT0);
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9);
}

void kl_CANInit(void)
{
GPIO_setPinConfig(GPIO_5_CANA_RX);
GPIO_setPinConfig(GPIO_4_CANA_TX);

CAN_initModule(CANA_BASE);

// 100MHz Clock, Can Speed 250Kb/s, T1:10, T2:5, SJW:3
CAN_setBitTiming(CANA_BASE, 24, 0, 9, 4, 3);

CAN_enableInterrupt(CANA_BASE, CAN_INT_IE0 | CAN_INT_ERROR | CAN_INT_STATUS);
Interrupt_register(INT_CANA0, &canaISR);
Interrupt_enable(INT_CANA0);
CAN_enableGlobalInterrupt(CANA_BASE, CAN_GLOBAL_INT_CANINT0);

CAN_setupMessageObject(CANA_BASE, KL_CAN_TX_OBJ_ID, KL_CAN_TX_MSG_ID,
CAN_MSG_FRAME_EXT, CAN_MSG_OBJ_TYPE_TX, 0,
CAN_MSG_OBJ_TX_INT_ENABLE, 8);

CAN_setupMessageObject(CANA_BASE, KL_CAN_RX_OBJ_ID, KL_CAN_RX_MSG_ID,
CAN_MSG_FRAME_EXT, CAN_MSG_OBJ_TYPE_RX, 0,
CAN_MSG_OBJ_RX_INT_ENABLE, 8);

CAN_startModule(CANA_BASE);
}