Nios II and Python

Altera_Forum · ‎10-05-2017

I am trying to send char bytes from my fpga to a python program, the data bytes are hexadecimal data, and those values will be plotted in a GUI table. The nios code is

unsigned char temp =0xa;

unsigned char temp1 =0xb;

unsigned char temp2 =0xc;

while(1)

{

sendFloat(temp);

sendFloat(temp1);

sendFloat(temp2);

}

return0;

}

void sendFloat( unsigned char n)

{

char number[20];

int i=0;

snprintf(number, sizeof(number),"%u", n);

while(i<20){

IOWR_ALTERA_AVALON_UART_TXDATA(UART_BASE,number[i]);

delay();

i++;

}

IOWR_ALTERA_AVALON_UART_TXDATA(UART_BASE,'\n');}

The Python code is

import serial

ser= serial.Serial('COM5',baudrate =115200, timeout=1)

while 1:

fpgadata=ser.readline()

print(fpgadata)

Altera_Forum · ‎10-05-2017

Your Nios code doesn't show whether you setup your Baudrate correctly - or at all. (Depending on your FPGA design you may not need to. However, it will need setting up somewhere.)

Refer to chapter 7 - UART Core - of the "embedded peripherals ip user guide (https://www.altera.com/en_us/pdfs/literature/ug/ug_embedded_ip.pdf)". This has some code you can crib from too.

Python looks adequate. Lookup the "Serial.inWaiting()". I think you'll find it helpful.

Cheers,

Alex

Altera_Forum · ‎10-05-2017

Thanks for your reply, actually i forgot to mention the problem there was also some random garbage values were printed with actual data.

But i got the solution for my problem, the char number[20] should be number[2]