lpc2119的can中断发送怎样发啊，现在感觉一直用的查询发送，效率太低了，有没有好的方案啊，
/*
********************************************************************************
**函数名称:startup_sendcan
**函数功能:启动发送
**入口参数:cannum:CAN控制器通道号ptr:发送缓冲区指针
**出口参数:1: erro 0:right
**函数说明:
**
********************************************************************************
*/
uint32 startup_sendcan(uint32 cannum, struct txcanbuf *ptr)
{
uint32 status = 0;
uCANCMR Temp;
Temp.Word = 0;
if (0 != CANSR(cannum).Bits.TBS1_BIT) {
if (0 == CANSR(cannum).Bits.TS1_BIT) {
CANTFI1(cannum) = ptr->txdbuf_can[ptr->end].TxFrameInfo;
CANTID1(cannum) = ptr->txdbuf_can[ptr->end].TxCANID;
CANTDA1(cannum) = ptr->txdbuf_can[ptr->end].CANTDA;
CANTDB1(cannum) = ptr->txdbuf_can[ptr->end].CANTDB;
Temp.Bits.STB1_BIT = 1;
}else{
status = 1;
}
} else if (0 != CANSR(cannum).Bits.TBS2_BIT){
if (0== CANSR(cannum).Bits.TS2_BIT) {
CANTFI2(cannum) = ptr->txdbuf_can[ptr->end].TxFrameInfo;
CANTID2(cannum) = ptr->txdbuf_can[ptr->end].TxCANID;
CANTDA3(cannum) = ptr->txdbuf_can[ptr->end].CANTDA;
CANTDB2(cannum) = ptr->txdbuf_can[ptr->end].CANTDB;
Temp.Bits.STB2_BIT = 1;
}else{
status = 1;
}
}else if (0 != CANSR(cannum).Bits.TBS3_BIT){
if (0 == CANSR(cannum).Bits.TS3_BIT) {
CANTFI3(cannum) = ptr->txdbuf_can[ptr->end].TxFrameInfo;
CANTID3(cannum) = ptr->txdbuf_can[ptr->end].TxCANID;
CANTDA3(cannum) = ptr->txdbuf_can[ptr->end].CANTDA;
CANTDB3(cannum) = ptr->txdbuf_can[ptr->end].CANTDB;
Temp.Bits.STB3_BIT = 1;
}else{
status = 1;
}
}else{
status = 1;
}
if (status == 0){
if(CANMOD(cannum).Bits.SM_BIT != 0) {
CanQuitSM(cannum);
}
Temp.Bits.TR_BIT = 1;
CANCMR(cannum).Word = Temp.Word;
}
return status;
}
/*
********************************************************************************
**函数名称:send2canbus
**函数功能:发送缓冲区数据到CAN总线上
**入口参数:cannum:CAN控制器通道号
**出口参数:无
**函数说明:
**
********************************************************************************
*/
void send2canbus(uint32 cannum)
{
uint8 length = 0;
struct txcanbuf *ptr;
if (CAN1 == cannum) {
ptr = &can1buf_txd;
length = MAX_TX_CAN1;
} else if (CAN2 == cannum){
if (setup_total.type != REPEATERS)
return;
ptr = &can2buf_txd;
length = MAX_TX_CAN2;
}else return;
if ((ptr->full == _FULL_) || (ptr->end != ptr->start)){
if (CANGSR(cannum).Bits.TBS_BIT != 0){
if (startup_sendcan(cannum,ptr) != 1){
TCAN_LEDGlint();
if (++ptr->end >= length)
ptr->end = 0;
ptr->full = _EMPTY_;
}
}
}
}
/*
********************************************************************************
**函数名称:can_isr
**函数功能:can中断复位函数
**入口参数:无
**出口参数:无
**函数说明:
**
********************************************************************************
*/
void __irq can_isr(void)
{
uint32 j = 0;
uCANICR k;
for (j=0; j<CAN_MAX_NUM; j++) {
k = CANICR(j);
if (k.Bits.RI_BIT != 0){
rcvdata_fromcanbus(j);
}
/*
if ((k.Bits.TI1_BIT != 0)
|| (k.Bits.TI2_BIT != 0)
|| (k.Bits.TI3_BIT != 0)) {
}
*/
if (k.Bits.BEI_BIT != 0) {
CanBufOffLinePrg(j);
}
if (k.Bits.DOI_BIT != 0) {
ClrCanDataOver(j);
}
}
VICVectAddr = 0x00;
}
应怎样像串口那样采用中断发送啊，只要吧数据丢到缓冲区就不用管它了，中断自动发送，效率肯定高很多！谢谢，有人用过吗 |
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