Pause the counter when a button is pressed, and resume the counter once the button is pressed again.

[AKhaa]

I tried to do some modification in binary counter example which comes with niosiiesd. But i can't get my required output. My irq value in qsys is 2 for button. Some one help me to sort out this issue. Thanks

    #include "count_binary.h"   /* A "loop counter" variable. */ static alt_u8 count; /* A variable to hold the value of the button pio edge capture register. */ volatile int edge_capture;       #ifdef BUTTON_PIO_BASE   #ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT static void handle_button_interrupts(void* context) #else static void handle_button_interrupts(void* context, alt_u32 id) #endif { /* Cast context to edge_capture's type. It is important that this be * declared volatile to avoid unwanted compiler optimization. */ volatile int* edge_capture_ptr = (volatile int*) context; /* Store the value in the Button's edge capture register in *context. */ *edge_capture_ptr = IORD_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE); /* Reset the Button's edge capture register. */ IOWR_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE, 0);   /* * Read the PIO to delay ISR exit. This is done to prevent a spurious * interrupt in systems with high processor -> pio latency and fast * interrupts. */ IORD_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE); }   /* Initialize the button_pio. */   static void init_button_pio() { /* Recast the edge_capture pointer to match the alt_irq_register() function * prototype. */ void* edge_capture_ptr = (void*) &edge_capture; /* Enable all 4 button interrupts. */ IOWR_ALTERA_AVALON_PIO_IRQ_MASK(BUTTON_PIO_BASE, 0xf); /* Reset the edge capture register. */ IOWR_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE, 0x0); /* Register the interrupt handler. */ #ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT alt_ic_isr_register(BUTTON_PIO_IRQ_INTERRUPT_CONTROLLER_ID, BUTTON_PIO_IRQ, handle_button_interrupts, edge_capture_ptr, 0x0); #else alt_irq_register( BUTTON_PIO_IRQ, edge_capture_ptr, handle_button_interrupts); #endif } #endif /* BUTTON_PIO_BASE */   /* Seven Segment Display PIO Functions * sevenseg_set_hex() -- implements a hex digit map. */   #ifdef SEVEN_SEG_PIO_BASE static void sevenseg_set_hex(int hex) { static alt_u8 segments[16] = { 0x40, 0x79, 0x24, 0x30, 0x19, 0x12, 0x02, 0x78, 0x00, 0x18, /* 0-9 */ 0x88, 0x00, 0x46, 0x40, 0x06, 0x0E }; /* a-f */   unsigned int data = segments[hex & 15] | (segments[(hex >> 4) & 15] << 8);   IOWR_ALTERA_AVALON_PIO_DATA(SEVEN_SEG_PIO_BASE, data); usleep(1000000); } #endif     static void lcd_init( FILE *lcd ) { /* If the LCD Display exists, write a simple message on the first line. */ LCD_PRINTF(lcd, "%c%s Counting will be displayed below...", ESC, ESC_TOP_LEFT); }   static void initial_message() { printf("\n\n**************************\n"); printf("* Hello from Nios II! *\n"); printf("* Counting from 00 to ff *\n"); printf("**************************\n"); }       static void count_led() { #ifdef LED_PIO_BASE IOWR_ALTERA_AVALON_PIO_DATA( LED_PIO_BASE, count ); #endif }         static void count_sevenseg() { #ifdef SEVEN_SEG_PIO_BASE sevenseg_set_hex(count); #endif }       static void count_lcd( void* arg ) { FILE* __attribute__ ((unused)) lcd; /* Attribute suppresses "unused variable" warning. */ lcd = (FILE*) arg; LCD_PRINTF(lcd, "%c%s 0x%x\n", ESC, ESC_COL2_INDENT5, count); }   /* count_all merely combines all three peripherals counting */   static void count_all( void* arg ) { count_led(); count_sevenseg(); count_lcd( arg ); printf("%02x, ", count); }     static void handle_button_press(alt_u8 type, FILE *lcd) { /* Button press actions while counting. */ if (type == 'c') { switch (edge_capture) { /* Button 1: Output counting to LED only. */   /* Button 2: Output counting to SEVEN SEG only. */ case 0x1: count_sevenseg(); break; /* Button 3: Output counting to D only. */ case 0x4: count_lcd( lcd ); break; /* Button 4: Output counting to LED, SEVEN_SEG, and D. */ case 0x8: count_all( lcd ); break; /* If value ends up being something different (shouldn't) do same as 8. */ default: count_all( lcd ); break; } } /* If 'type' is anything else, assume we're "waiting"...*/ else { printf("* interrput *"); edge_capture = 0; if (edge_capture = 2) { edge_capture = 0; count_all(lcd); }   else { usleep(5000000); }   }     }           int main(void) { int i; int __attribute__ ((unused)) wait_time; /* Attribute suppresses "var set but not used" warning. */ FILE * lcd;   count = 0;   /* Initialize the LCD, if there is one. */ lcd = LCD_OPEN(); if(lcd != NULL) {lcd_init( lcd );}   /* Initialize the button pio. */   #ifdef BUTTON_PIO_BASE init_button_pio(); #endif   /* Initial message to output. */   initial_message();   /* Continue 0-ff counting loop. */   while( 1 ) { usleep(100000); if (edge_capture != 0) { /* Handle button presses while counting... */ handle_button_press('d', lcd); } /* If no button presses, try to output counting to all. */ else { count_all( lcd ); } /* * If done counting, wait about 7 seconds... * detect button presses while waiting. */ if( count == 0xff ) {   edge_capture = 0; /* Reset to 0 during wait/pause period. */   wait_time = 0; for (i = 0; i<70; ++i) { printf("."); wait_time = i/10; LCD_PRINTF(lcd, "%c%s %ds\n", ESC, ESC_COL2_INDENT5, wait_time+1);   if (edge_capture != 0) { printf( "\nYou pushed: " ); handle_button_press('d', lcd); } usleep(100000); /* Sleep for 0.1s. */ } /* Output the "loop start" messages before looping, again. */ initial_message();   } count++; } LCD_CLOSE(lcd); return 0; }  

[Vicky1]

Hi,

Please, provide below details for replication,

1. Quartus edition & version.
2. Board/Kit used
3. current observation as a output

Best Regards

Vikas Jathar 

(This message was posted on behalf of Intel Corporation)

[AKhaa]

Hello @Vicky​ ,

My quartus edition is 17.1

Board is DE10-Lite

I can see the output as it should be in this example code but i don't know what to do to modify it according to my requirements. I tried some modification but got no luck. Thanks for reply

[Vicky1]

Hi,

Please refer the below link & try to understand available examples that may help to code your logic,

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/nios2/n2sw_nii52004.pdf

Best Regards

Vikas Jathar 

(This message was posted on behalf of Intel Corporation)