Hi,
I used the following code to access the UART (rs232 serial port) component I created in Qsys, I connected the txdata pin to the oscilloscope and it shows nothing, i am wondering why couldn't I use IOWR_ALTERA_AVALON_UART_TXDATA(UART_BASE, txdata); to transmit data to UART?
What I want to do is Nios processor reads data from FPGA, Nios transmits the data to serial port and plot graph real time using Maltab,using de0 nano. I do not need to read data from serial port.
#include "altera_avalon_uart_regs.h"
#define UART_BASE 0x00002000
int main (void)
{alt_u16 status, rxdata=0,aa=0, txdata=0;
while (! (status & 0x0040)) // Wait for transmission completion
status = IORD_ALTERA_AVALON_UART_STATUS (UART_BASE);
printf("status= %.2f V \r\n", (float) status);
rxdata = 5; // assuming I get this data by accessing sdram in Nios
txdata = rxdata;
IOWR_ALTERA_AVALON_UART_TXDATA(UART_BASE, txdata);
printf("txdata= %.2f V \r\n", (float) txdata);
return 0;}
Could you please give me some hints? Thanks
