Cotex-M3 LM9S92 CAN总线发送数据

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芯片为LM3S9B92，使用PB4和PB5作为CAN0RX和CAN0TX。

下面是一个一直发送的例子:

//This is demo for lm3s9b92//Created by Robin//2012-02-05//CAN发送数据例子//使用PB4和PB5作为CAN0RX和CAN0TX#include "hw_memmap.h"#include "hw_types.h"#include "hw_can.h"#include "hw_ints.h"#include "can.h"#include "interrupt.h"#include "sysctl.h"#include "gpio.h"tCANBitClkParms CANBitClk;tCANMsgObject sMsgObjectRx;tCANMsgObject sMsgObjectTx;unsigned char ucBufferIn[8];unsigned char ucBufferOut[8]={0,2,3,4,5,6,7,8};//延时函数void delay(){unsigned long ulLoop;for(ulLoop = 0; ulLoop < 4000000; ulLoop++){}}//发送void send(){sMsgObjectTx.ulMsgID = 0x7ff;sMsgObjectTx.ulFlags = 0;sMsgObjectTx.ulMsgLen = 1;sMsgObjectTx.pucMsgData = ucBufferOut;//发送CANMessageSet(CAN0_BASE, 1, &sMsgObjectTx, MSG_OBJ_TYPE_TX);}int main(){//系统初始化SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);//使能端口BSysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);//PB4和PB5用作CANGPIOPinConfigure(GPIO_PB4_CAN0RX);GPIOPinConfigure(GPIO_PB5_CAN0TX);//PB4 PB5作为CAN引脚GPIOPinTypeCAN(GPIO_PORTB_BASE, GPIO_PIN_4 | GPIO_PIN_5);//使能外设CAN0SysCtlPeripheralEnable(SYSCTL_PERIPH_CAN0);//初始化CAN0CANInit(CAN0_BASE);//设置通信速率125kbpsCANBitRateSet(CAN0_BASE, SysCtlClockGet(), 125000);//使能CAN0CANEnable(CAN0_BASE);for(;;){        send();        delay();++ucBufferOut[0];}}

引脚配置的这两个很重要，但是很多地方的源代码都没提到。。。。
GPIOPinConfigure(GPIO_PB4_CAN0RX);
GPIOPinConfigure(GPIO_PB5_CAN0TX);