PulseBlaster
Appendix II: Sample C Program
A more complex program using C Functions is provided below.
//*
* PulseBlaster example 2
* This example makes use of all instructions (except WAIT).
*/
#include <stdio.h>
#define PB24
#include <spinapi.h>
int main(int argc, char **argv){
int start, loop, sub;
int status;
printf ("Using spinapi library version %s\n", pb_get_version());
if(pb_init() != 0) {
printf ("Error initializing board: %s\n", pb_get_error());
return -1;
}
// Tell the driver what clock frequency the board has (in MHz)
pb_set_clock(100.0);
pb_start_programming(PULSE_PROGRAM);
// Since we are going to jump forward in our program, we need to
// define this variable by hand. Instructions start at 0 and count up
sub = 5;
// Instruction format
// int pb_inst(int flags, int inst, int inst_data, int length)
// Instruction 0 - Jump to Subroutine at Instruction 4 in 1s
start =
pb_inst(0xFFFFFF,JSR, sub, 1000.0 * ms);
// Loop. Instructions 1 and 2 will be repeated 3 times
// Instruction 1 - Beginning of Loop (Loop 3 times).
// Continue to next instruction in 1s
loop =
pb_inst(0x0,LOOP,3,150.0 * ms);
// Instruction 2 - End of Loop. Return to beginning of loop or
// continue to next instruction in .5 s
pb_inst(0xFFFFFF,END_LOOP,loop,150.0 * ms);
// Instruction 3 - Stay here for (5*100ms) then continue to Instruction
// 4
pb_inst(0x0,LONG_DELAY,5, 100.0 * ms);
// Instruction 4 - Branch to "start" (Instruction 0) in 1 s
pb_inst(0x0,BRANCH,start,1000.0*ms);
// Subroutine
// Instruction 5 - Continue to next instruction in 1 * s
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5/19/2006
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