Success with timer interrupt and serial interrupt at last !!!
Here's the code :
/*
* "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.
*
*/# include <stdio.h># include <unistd.h># include <fcntl.h># include "sys/alt_stdio.h"# include "system.h"# include "alt_types.h"# include "altera_avalon_uart_regs.h"# include "altera_avalon_timer_regs.h"# include "sys/alt_irq.h"
# define Switches (volatile char *) 0x00041040# define LEDs (char *) 0x00041050# define UART0_BASE (char *) 0x00041000# define UART0_IRQ 1# define TIMER0_IRQ 2# define TIMER0_BASE (char *) 0x00041020
void uart0_put_char(unsigned char ch)
{
while((IORD_ALTERA_AVALON_UART_STATUS(UART0_BASE) & 0x040) != 0x040){ ;}
IOWR_ALTERA_AVALON_UART_TXDATA(UART0_BASE,ch);
}
void uart0_put_str(unsigned char * str){
while(*str){
uart0_put_char(*str);
str++;
}
}
void uart_handle(void *context,alt_u32 interrupt)
{
unsigned short int data,status;
status = IORD_ALTERA_AVALON_UART_STATUS(UART0_BASE);
data =IORD_ALTERA_AVALON_UART_RXDATA(UART0_BASE);
*LEDs=(char)data;
}
void uart_init()
{
alt_u32 control;
volatile unsigned long uart_capture;
control = ALTERA_AVALON_UART_CONTROL_TRDY_MSK | ALTERA_AVALON_UART_CONTROL_RRDY_MSK | ALTERA_AVALON_UART_CONTROL_E_MSK;
IOWR_ALTERA_AVALON_UART_CONTROL(UART0_BASE, control);
if (alt_irq_register(UART0_IRQ, (void*)uart_capture, uart_handle)){
alt_putstr("UART0_IRQ Register Successful\n");
}else{
alt_putstr("UART0_IRQ Register UnSuccessful\n");
}
}
void handle_timer_interrupt (void* context, alt_u32 id){
static alt_u32 value = 0x00;
value = value + 1;
if(value % 1000 == 0){
*LEDs=(char)value;
}
IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER0_BASE,0); // Clear the interrupt flag
}
void timer_init(){
IOWR_ALTERA_AVALON_TIMER_CONTROL (TIMER0_BASE,ALTERA_AVALON_TIMER_CONTROL_ITO_MSK | ALTERA_AVALON_TIMER_CONTROL_CONT_MSK | ALTERA_AVALON_TIMER_CONTROL_START_MSK);
alt_irq_register(TIMER0_IRQ, 0, handle_timer_interrupt);
}
int main(){
printf("Hello from NIOS II \n");
uart_init();
printf("uart init successful");
timer_init();
printf("timer init successful");
//usleep(1000000);
printf("Hello from NIOS III \n");
*LEDs = 0xAA;
printf("Switch Status : %x " , (char)*Switches);
uart0_put_str("Hello World");
while(1){
//*LEDs = *Switches;
printf("hello");
}
return 0;
}
I've used LEDs to be driven in both serial interrupt and timer interrupt (plz don't mind)
(Check your base addresses and irq number generated by SOPC if you are going to try this code)
Honored Contributor
