I have just started with easy programming codes to understand the xmos architecture. In particular, I am working with xcore 200 multichannel-audio platform
Well, the case is simple, I wanna flash a LED when I push one of the general purpose buttons. How I set out this is, programming a specific task for flash the matrix led and another specific task for the buttons.
I know that there are easier ways to perform this but I wanna make in this way because I want to know how a task in one core can communicate with another task in a different core. I believe that the solutions come from streaming data over channels
The code is this:
Code: Select all
/*
* ledbuton.xc
*
* Created on: 30/01/2019
* Author: Sergio
*/
#include <platform.h>
#include <print.h>
#include <stdio.h>
#include <xs1.h>
/* Buttons/switch port */
in port p_sw = on tile[1] : XS1_PORT_4B;
/* LED grid port */
out port p_leds_row = on tile[1] : XS1_PORT_4C;
out port p_leds_col = on tile[1] : XS1_PORT_4D;
void my_led_matrix(streaming chanend c) {
int i;
c :> i;
//if (i == 1){
// if (Pxx == 0x1){
// p_leds_row <: 0x0;
// delay_milliseconds(500);
// }
//}
if (i == 1){
p_leds_row <: 0x0;
delay_milliseconds(500);
}
}
void my_button(streaming chanend c){
int current_val = 0;
int is_stable = 1;
timer tmr ;
const unsigned debounce_delay_ms = 50;
unsigned debounce_timeout ;
while (1) {
select {
// If the button is " stable ", react when the I/O pin changes value
case is_stable => p_sw when pinsneq ( current_val ) :> current_val :
if ( current_val == 0x1) {
c <: 1;
printf(" Button up\n");
} else {
printf (" Button down \n");
}
is_stable = 0;
int current_time ;
tmr :> current_time ;
// Calculate time to event after debounce period
// note that XS1_TIMER_HZ is defined in timer .h
debounce_timeout = current_time + ( debounce_delay_ms * XS1_TIMER_HZ );
break ;
// If the button is not stable (i.e. bouncing around ) then select
// when we the timer reaches the timeout to renter a stable period
case ! is_stable => tmr when timerafter ( debounce_timeout ) :> void :
is_stable = 1;
break ;
}
}
}
int main(){
streaming chan c;
par{
on tile[1]: my_button(c);
on tile[1]: my_led_matrix(c);
}
return 0;
}
Another thing that I believe that I am allowed to do is this:
Code: Select all
par{
on tile[1].core[0]: my_button(c);
on tile[1].core[1]: my_led_matrix(c);
}
Someone can please help me
