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++

Writing to UART

Altera_Forum
Honored Contributor II
1,050 Views

Simple code, trying to write to UART from terminal and light an LED if character "A" is detected. What am i doing wrong? here is the code. The manual of UART is here under \devices: http://www-ug.eecg.toronto.edu/msl/nios.html 

# include <stdio.h># define RS232_UART_DATA ((volatile int*) 0x10001010)# define RS232_UART_CONTROL ((volatile int*) (0x10001010+4)) 

volatile int*LED =(int*)0x10000010; 

 

 

int main() 

 

 

unsigned char *pinput; 

 

while(*pinput){ 

//strings in C are zero terminated 

 

//if room in output buffer 

if((*RS232_UART_DATA)&0xffff0000 )  

//then read the next character 

*(pinput)= *RS232_UART_DATA;  

if (pinput =='A'){ 

*(LED)=1; } 

 

 

 

 

}
0 Kudos
2 Replies
Altera_Forum
Honored Contributor II
294 Views

Check your compiler warnings. 'pinput' is an uninitialized pointer variable and it's entirely possible it is pointing at garbage memory containing a zero when your program starts.

0 Kudos
Altera_Forum
Honored Contributor II
294 Views

do confirm if the value that pinput is holding when any car detected.

0 Kudos
Reply