Sundance SMT326v2 - Manual (Page 13)

Release Page 13 of 24 SMT326 DSP PC/ISA System User Guide
Document Name: SMT326 Ugv2.doc Original Date: 08/11/97
Product Name: SMT326 Revision Date: 08/26/99
Author: Graeme Parker – Fabio Ancona
Example Code
This example code shows how to capture all 32 channels (individually). Note that the data is right
shifted 4 bits purely to convert it into a 16 bit sample. Also note that the sampling of the channels is
performed in two parts (left and right). When interrupts are used to trigger the sampling, a single
interrupt channel is asserted for the left and right channels. Thus an interrupt based system will have
to synchronise with the left/right status before enabling interrupts.
fpga =(unsigned long *)0x80200000;
for(channel=0;channel!=16;channel++) {
for(i=0;i!=250;i++) {
while( ((*status) & 0x02) != 0);
sample[channel][i]=( (*fpga) >>4 )&0x0ffff;
while( ((*status) & 0x02) == 0);
}
fpga++;
}
for(channel=16;channel!=32;channel++) {
for(i=0;i!=250;i++) {
while( ((*status) & 0x02) != 2);
sample[channel][i]=( (*fpga) >>4 )&0x0ffff;
while( ((*status) & 0x02) == 2);
}
fpga++;
}