[参考译文] CODECOMPOSER：将 Volatile 与 CLA 和 CPU 中断结合使用

// cla_shared.c

// shared variables with cpu
// in cpu2cla message RAM
#pragma SET_DATA_SECTION("SCRATCH_CPU1TOCLA1")
volatile float iir_input_cpu2cla=0;
// in cla2cpu message RAM
#pragma SET_DATA_SECTION("SCRATCH_CLA1TOCPU1")
volatile float iir_output_cla2cpu;

// clatasks.cla

// shared variables with cpu
// in cpu2cla message RAM
extern volatile float iir_input_cpu2cla;
// in cla2cpu message RAM
extern volatile float iir_output_cla2cpu;
// local variables for CLA only
float IIR_SR[6];
float IIR_B[4];
float IIR_A[4];

// cla task 1 is triggered by ePWM interrupt
interrupt void Cla1Task1(void) {
    iir_output_cla2cpu = iir_input_cpu2cla*IIR_B[0] + IIR_SR[5];

    IIR_SR[4] = iir_input_cpu2cla*IIR_B[1] + iir_output_cla2cpu*IIR_A[1] + IIR_SR[3];
    IIR_SR[5] = IIR_SR[4];

    IIR_SR[2] = iir_input_cpu2cla*IIR_B[2] + iir_output_cla2cpu*IIR_A[2] + IIR_SR[1];
    IIR_SR[3] = IIR_SR[2];

    IIR_SR[0] = iir_input_cpu2cla*IIR_B[3] + iir_output_cla2cpu*IIR_A[3];
    IIR_SR[1] = IIR_SR[0];
	
	// trigger the CPU ISR
	CLA_forceSoftwareInterrupt(CLA1SOFT_IN_REGS, 1);
}

// cpuisr.c

// shared variables with cpu
// in cpu2cla message RAM
extern volatile float iir_input_cpu2cla;
// in cla2cpu message RAM
extern volatile float iir_output_cla2cpu;
// cpu-only variables in GSRAM
float time=0.0;

// CPU ISR is triggered by CLA task 1, software force interrupt
interrupt void CPU_ISR(void) {
	time+=1.0;
	iir_input_cpu2cla=sin(idx*2*3.14159/1000.0);
	if(iir_output_cla2cpu>0.5) {
		// stuff depending on iir_output_cla2cpu
	}
	if(iir_output_cla2cpu<-0.5) {
		// stuff depending on iir_output_cla2cpu
	}
	if(iir_input_cpu2cla>0.5) {
		// stuff depending on iir_input_cpu2cla
	}
	if(iir_input_cpu2cla<-0.5) {
		// stuff depending on iir_input_cpu2cla
	}
	// ack the pie
	PieCtrlRegs.PIEACK.all = PIEACK_GROUP11;
}