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Honored Contributor
Honored ContributorNIOS II timer problem
Hi, I've got a problem with my program running on DE2 board from altera (Nios II processor)
Our task was to construct a model of a washing machine, and allow user to choose the speed of spin. In addition, program has to use interrupts. We did it on Sw slider switches, and a hex display - for displaying the chosen value. Below is our code(based on hello world template). But now we have to make a latency after someone turns on the switch and before the value appears on the display, for example 3 sec. We need to use alt_nticks() function. My idea of how it should work was - in the first instruction of the interrupt handler function store the value of current time and then in the if statement if(swstate & SW1) add an additional condition like this if(swstate & SW1 && currenttime - alt_nticks() < 3*alt_ntics_per_second()) but when we tried to read a time in the interrupt handler something bad was going with the program, value of time was always zero or the program didnt respond. I am not sure how exactly alt_nticks() funkction is working... or maybe this was a completely wrong way? My question is how to make such a latency I describe? I would appreciate any hints. Thanks for help :)/*
* "Hello World" example.
*
* This example prints 'Hello from Nios II' to the STDOUT stream. It runs on
* the Nios II 'standard', 'full_featured', 'fast', and 'low_cost' example
* designs. It runs with or without the MicroC/OS-II RTOS and requires a STDOUT
* device in your system's hardware.
* The memory footprint of this hosted application is ~69 kbytes by default
* using the standard reference design.
*
* For a reduced footprint version of this template, and an explanation of how
* to reduce the memory footprint for a given application, see the
* "small_hello_world" template.
*
*/
# define SW0 0x00000001
# define SW1 0x00000002
# define SW2 0x00000004
# define SW3 0x00000008
# define SW4 0x00000010
# define SW5 0x00000020
# define SW6 0x00000040
# define SW7 0x00000080
# define SW8 0x00000100
# define SW9 0x00000200
# define SW10 0x00000400
# define SW11 0x00000800
# define SW12 0x00001000
# define SW13 0x00002000
# define SW14 0x00004000
# define SW15 0x00008000
# define SW16 0x00010000
# define SW17 0x00020000
# define KEY1 0x00000002
# define KEY2 0x00000004
# define KEY3 0x00000008
# define LED0 0x00000001
# define LED1 0x00000002
# define LED2 0x00000004
# define LED3 0x00000008
# define LED4 0x00000010
# define LED5 0x00000020
# define LED6 0x00000040
# define LED7 0x00000080
# define LED8 0x00000100
# define LED9 0x00000200
# define LED10 0x00000400
# define LED11 0x00000800
# define LED12 0x00001000
# define LED13 0x00002000
# define LED14 0x00004000
# define LED15 0x00008000
# define LED16 0x00010000
# define LED17 0x00020000
# define SEGA 0x01
# define SEGB 0x02
# define SEGC 0x03
# define SEGD 0x04
# define SEGE 0x08
# define SEGF 0x10
# define SEGG 0x20
# include <stdio.h>
# include <io.h>
# include <system.h>
# include "altera_up_avalon_parallel_port.h"
# include "sys/alt_irq.h"
# include <sys/alt_timestamp.h>
# include "sys/alt_alarm.h"
# include "alt_types.h"
int swstate = 0;
int state = 0;
int wybrano = 0;
struct alt_up_dev{
alt_up_parallel_port_dev* uchwytSW;
alt_up_parallel_port_dev* uchwytLEDR;
alt_up_parallel_port_dev* uchwytHEX;
};
struct alt_up_dev up_dev;
void wyswietl(int raz, int dwa, int czy, int cztery){
//IOWR(PARALLEL_PORT_3_BASE,0, (raz << 24) | (dwa <<16) | (czy <<8) |cztery);
alt_up_parallel_port_write_data(up_dev.uchwytHEX, (raz << 24) | (dwa <<16) | (czy <<8) |cztery);
}
int czaspoczatkowy = 0;
int czaslokalny = 0;
int tik = 0;
int flag = 0;
void interrupt_hanlder(struct alt_up_dev* up_dev, alt_u32 id){
swstate = alt_up_parallel_port_read_data(up_dev->uchwytSW);
czaspoczatkowy = alt_nticks();
if(flag==0){
flag = 1;
}
wyswietl(0,0, 0, 0);
switch(state){
case 0: //sw0
czaslokalny = alt_nticks();
if((swstate & SW0)){
czaspoczatkowy = alt_nticks();
wybrano= wybrano + 1;
wyswietl(0,127, 63, 63);
//printf("Wybrano 0!\n");
}//koniec if
state = 1;
break;
case 1:
if(swstate & SW1){
wybrano= wybrano + 1;
wyswietl(0,111, 63, 63);
//printf("Wybrano 1!\n");
}//koniec if
state = 2;
break;
case 2:
if(swstate & SW2){
wybrano= wybrano + 1;
wyswietl(6,63, 63, 63);
// printf("Wybrano 2!\n");
}//koniec if
state = 3;
break;// koniec case 2
case 3:
if(swstate & SW3){
wybrano= wybrano + 1;
wyswietl(6,6, 63, 63);
// printf("Wybrano 3!\n");
}//koniec if
state = 4;
break;// koniec case 3
case 4:
if(swstate & SW4){
wybrano= wybrano + 1;
wyswietl(6,91, 63, 63);
// printf("Wybrano 4!\n");
}//koniec if
state = 5;
break;// koniec case 4
case 5:
if(wybrano > 1){
state = 6;
// printf("%d",wybrano);
// printf("Wybrano 5!\n");
}//koniec if
else{
wybrano = 0;
state = 0;
}
break;// koniec case 3
case 6:
//IOWR(PARALLEL_PORT_2_BASE, 0, 1);
alt_up_parallel_port_write_data(up_dev->uchwytLEDR, 1);
wyswietl(0,121, 80, 80);
if(swstate == 0){
wybrano = 0;
state = 5;
//IOWR(PARALLEL_PORT_2_BASE, 0, 0);
alt_up_parallel_port_write_data(up_dev->uchwytLEDR, 0);
}
break;// koniec case 3
}//koniec switcha
// clear_edge_capture();
}
int main()
{
printf("Hello from Nios II!\n");
tik = 3* alt_ticks_per_second();
while(1){
alt_up_parallel_port_dev *uchwytSW = alt_up_parallel_port_open_dev("/dev/parallel_port_0");
alt_up_parallel_port_dev *uchwytRED = alt_up_parallel_port_open_dev("/dev/parallel_port_2");
alt_up_parallel_port_dev *uchwytHEX = alt_up_parallel_port_open_dev("/dev/parallel_port_3");
if(uchwytSW != NULL){
up_dev.uchwytSW = uchwytSW;
}
if(uchwytRED != NULL){
up_dev.uchwytLEDR = uchwytRED;
}
if(uchwytHEX != NULL){
up_dev.uchwytHEX = uchwytHEX;
}
alt_irq_register(1,(void*) &up_dev,(void*) interrupt_hanlder);
alt_up_parallel_port_set_interrupt_mask(uchwytSW,0xff);
}//koniec while
return 0;
}
