使用Xgate三步法

uniqueeefocus36

一：在main.c中把某个中断事件指向Xgate;
二：在xgate.cxgate中创建中断函数；
三：在xgate.cxgate中设置这个中断的向量表；
以PIT0为例，具体操作如下：
使用mc9s12xdt512芯片和codewarrior4.7
---------------------以下在main.c中------------------------- -- -----
#define SOFTWARETRIGGER0_VEC 0x72 /* vector address= 2 * channel id */
// ①: Config PIT channel 0 interrupt register: define vector number
#define PIT_CH0_VEC           0x7A   
static void SetupXGATE(void) {
/* initialize the XGATE vector block and
     set the XGVBR register to its start address */
XGVBR= (unsigned int)(void*__far)(XGATE_VectorTable - XGATE_VECTOR_OFFSET);
/* switch software trigger 0 interrupt to XGATE */
ROUTE_INTERRUPT(SOFTWARETRIGGER0_VEC, 0x81); /* RQST=1 and PRIO=1 */


// ②: Config PIT channel 0 interrupt register
ROUTE_INTERRUPT(PIT_CH0_VEC, 0x81); // RQST=1: route PIT_ch0 to XGATE; PRIO=1: priority = 1
/* enable XGATE mode and interrupts */
XGMCTL= 0xFBC1; /* XGE | XGFRZ | XGIE */
/* force execution of software trigger 0 handler */
XGSWT= 0x0101;
}
③在main(void)中初始化PIT，xgate（codewarrior自动生成）
-------------------以下在xgate.cxgate-------------------------------
④加入#include "mc9s12xdt512.h" 头文件
// ⑤: define a digit
unsigned char digit=0;


// ⑥: PIT channel 0 thread on XGATE
interrupt void PIT_CH0_Handler(unsigned int dummy)
{   char asd;
    PITTF |= 0x01;             // wrire 1 to clear the channel 0 time out flag
    asd =digit;
    digit++;
<span lang="EN-US" style="font-size: 10.5pt; color: red; font-family: "Arial Unicode MS"">    PORTB = asd

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uniqueeefocus36

目前正在学习xgate,就找到了这些资料，希望大家能提供更多的资料，谢谢了啊！