Need help for my RS232 in NIOS II

Hey,

This is a function thats send one byte to the UART

void UART1_T(unsigned char ch)

{

while((IORD_ALTERA_AVALON_UART_STATUS(UART1_BASE) & 0x040) != 0x040){ ;}

IOWR_ALTERA_AVALON_UART_TXDATA(UART1_BASE,ch);

}

You only have to change UART1_BASE address to your UART address that you can find back in your system.h file

Good luck

Regards

Karel

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Hi,

I am doing a project with NIOS II and I need to transfer data between my board and the PC through the RS232.

I generated a NIOS II system with RS232 support. On my test, I can transfer data from the FPGA board to PC through RS232 by using the "IOWR_ALTERA_AVALON_UART_TXDATA" macro, but I can't write data into the FPGA board through RS232.

My question is:

If I want to write data into the FPGA board through RS232, do I need to setup the RS232's control register as "0x0080" (RRDY) before the writing? Or I just need to check the status register's value and write data when it is "0x0080". Even easiler, I just need to use the "IOWR_ALTERA_AVALON_UART_RXDATA" to write data directly without checking or setting the status of RS232.

Actually, I've tried all of the three above methods but failed. Everytime when I tried to read the data that I wrote in by using the "IORD_ALTERA_AVALON_UART_RXDATA", the value is "0".

Could anyone help me? Thanks.

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char character;

while(1)

{

alt_putstr("\nEnter character :\t");

character = alt_getchar();

alt_putstr("\nEchoed character :\t");

putchar(character);

}

//UART1_T(c);

return 0;

1. > Add RS232 in SOPC

2. > Open RS232 in Eclips "FILE *fp", fp = fopen("path of RS232 from system.h like /dev/....","rb+");

3. > use fprintf(fp,"%d", --your data---); for writing on RS232 port