Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Altera_Forum
Honored Contributor I
949 Views

UART RECEIVE interrupt in nios int status = 0; status = IORD_ALTERA_AVALON_UART_STAT

Hello, 

 

I need to read the uart data on interrupt bases ,means whenever there is something on rx pin of uart interrupt should get generated and in ISR should read it. 

I have tried by using bellow code but didn't get any success ... 

 

char data; 

volatile int edge_capture; 

 

void uart_isr() 

{  

int status = 0; status = IORD_ALTERA_AVALON_UART_STATUS(UART_0_BASE); 

if(status & 0x80) 

data = IORD_ALTERA_AVALON_UART_RXDATA(UART_0_BASE); 

interrupt_count = interrupt_count +1; 

 

void uart() 

void* edge_capture_ptr = (void*) &edge_capture; 

alt_ic_isr_register(UART_0_IRQ_INTERRUPT_CONTROLLER_ID, 

UART_0_IRQ, uartR, edge_capture_ptr, 0x0); 

alt_ic_irq_enable(UART_0_IRQ_INTERRUPT_CONTROLLER_ID,UART_0_IRQ); 

IOWR_ALTERA_AVALON_UART_CONTROL(UART_0_BASE,ALTERA_AVALON_UART_CONTROL_RRDY_MSK); 

 

sometime ISR just gets called once and sometime it will be keep getting even if there is nothing on uart RX bus.. 

M i doing something wrong here ..plz suggest me. 

If anyone has example code for uart interrupt receive plz share . 

 

Thanks and Regards 

Ankur
Tags (1)
0 Kudos
0 Replies
Reply