UART Interrupt and timer interrupt at the same time - UART Interrupt and timer interrupt at the same time I am using max10, DE10-Lite board. I try to use uart interrupt for get command code. an i also want use timer for periodic work until input command code. but uart interrupt is work only. timer interrupt does not work. it is my code. i want know what is wrong. #include <stdio.h> #include "system.h" #include "Nios_Variables.h" #include "string.h" #include <stdlib.h> #include <stdint.h> volatile uint16_t flag = 0u; int gpio; void handle_timer_interrupt(void*p, alt_u32 param); void uart_init(); void handle_uart_interrupt(void *context,alt_u32 interrupt); extern int alt_irq_register (alt_u32 id, void* context,void (*alt_isr_func)(void* isr_context, alt_u32 id) ); int main() { // register the timer irq to be serviced by handle_timer_interrupt() function alt_irq_register(TIMER_0_IRQ, 0, handle_timer_interrupt); // activate the time IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER_0_BASE, ALTERA_AVALON_TIMER_CONTROL_CONT_MSK | ALTERA_AVALON_TIMER_CONTROL_START_MSK | ALTERA_AVALON_TIMER_CONTROL_ITO_MSK); uart_init(); for(;;) { if(gpio == 1) { printf("SW Lock\n\r"); } else { if(flag > 0) { printf("A\n"); flag = 0; } } } return 0; } void handle_timer_interrupt(void*p, alt_u32 param) { // clear irq status in order to prevent retriggering IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER_0_BASE, 0); gpio = IORD_ALTERA_AVALON_PIO_DATA(PIO_0_BASE); // your isr code here flag++; } void handle_uart_interrupt(void *context,alt_u32 interrupt) { unsigned short int data,status; status = IORD_ALTERA_AVALON_UART_STATUS(E_UART_BASE); while (!(status & ALTERA_AVALON_UART_STATUS_RRDY_MSK)) status = IORD_ALTERA_AVALON_UART_STATUS(E_UART_BASE); data =IORD_ALTERA_AVALON_UART_RXDATA(E_UART_BASE); //write status reg; status = ALTERA_AVALON_UART_STATUS_TRDY_MSK; IOWR_ALTERA_AVALON_UART_STATUS(E_UART_BASE, status); IOWR_ALTERA_AVALON_UART_TXDATA(E_UART_BASE, data); IOWR_ALTERA_AVALON_UART_STATUS(E_UART_BASE, 0); } void uart_init() { alt_u32 control; control = ALTERA_AVALON_UART_CONTROL_TRDY_MSK | ALTERA_AVALON_UART_CONTROL_RRDY_MSK | ALTERA_AVALON_UART_CONTROL_E_MSK; IOWR_ALTERA_AVALON_UART_CONTROL(E_UART_BASE, control); alt_irq_register(E_UART_IRQ, 0, handle_uart_interrupt); } Replies: Re: UART Interrupt and timer interrupt at the same time I solved this problem and closed it, but it doesn't seem to close. Replies: Re: UART Interrupt and timer interrupt at the same time Hi Junbun, Did the code works for your issue? Best regards, Isaac. Replies: Re: UART Interrupt and timer interrupt at the same time Hi Junbum, sorry for the late response. I was looking for the right answer. Here you have an example code with the UART and Timer interruptions, the only difference is that it uses a timer init, could you compare your code with this. /* * "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; } Regards, Isaac - 2020-04-03