Nios® V/II Embedded Design Suite (EDS)
Support for Embedded Development Tools, Processors (SoCs and Nios® V/II processor), Embedded Development Suites (EDSs), Boot and Configuration, Operating Systems, C and C++
All support for Intel NUC 7 - 13 systems has transitioned to ASUS. Read latest update.

UART ISR and fprintf

Honored Contributor II

Hello, I am fairly new to writing ISRs and handling interrupts for the Nios processor.  


Here is a brief intro to what I'm trying to do and what is already working: 


I have created my own ISR in order to receive data from another device connected by UART. I would like to be able to write to that device as well. So far, if I enable interrupts and register my handler, I can no longer use fprintf or fwrite to send data back to that device. I would like to be able to nonetheless...what can I do?  


My ISR: 

volatile int uart_capture; void uart_handle(void *context){ unsigned short int data,status; volatile int* uart_ptr = (volatile int*) context; status = IORD_ALTERA_AVALON_UART_STATUS(BLUETOOTH_BASE); while (!(status & ALTERA_AVALON_UART_STATUS_RRDY_MSK)) status = IORD_ALTERA_AVALON_UART_STATUS(BLUETOOTH_BASE); data = IORD_ALTERA_AVALON_UART_RXDATA(BLUETOOTH_BASE); *uart_ptr = IORD_ALTERA_AVALON_UART_RXDATA(BLUETOOTH_BASE); IOWR_ALTERA_AVALON_UART_STATUS(BLUETOOTH_BASE, 0x0); IORD_ALTERA_AVALON_UART_RXDATA(BLUETOOTH_BASE); }
0 Kudos
0 Replies