RX and TX UART with NIOS2/e

Hi all,

I finally found some examples and make program, which work - it sends 4 bytes via uart0 and receives max.16 bytes via uart0. It works in hello world small template and when i compile, it take only 1852bytes (i run this on DE0_NANO development board).

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# include <stdio.h>

# include <unistd.h>

# include <fcntl.h>

# include "sys/alt_stdio.h"

# include "system.h"

# include "altera_avalon_pio_regs.h"

# include "altera_avalon_uart_regs.h"

# include "altera_avalon_uart.h"

// global variables

int count = 0,ch,n,status,led=0xff;

int rx_cnt,rx_buf[16];

int main()

{

alt_printf("1.Hello from Nios II!\n");

while(1)

{ // printf("Hello from Nios II!\n");

IOWR_ALTERA_AVALON_PIO_DATA(DATA_BUS_BASE, count );

IOWR_ALTERA_AVALON_PIO_DATA(LED_BASE, count);

count++;

// send 4 bytes via UART0 (with waiting 100us)

IOWR_ALTERA_AVALON_UART_TXDATA(UART_0_BASE,0xFF);

usleep(100);

IOWR_ALTERA_AVALON_UART_TXDATA(UART_0_BASE,0xAA);

usleep(100);

IOWR_ALTERA_AVALON_UART_TXDATA(UART_0_BASE,count/256);

usleep(100);

IOWR_ALTERA_AVALON_UART_TXDATA(UART_0_BASE,count%256);

usleep(100);

// read bytes from UART and wait 20ms

rx_cnt=0;

for(n=0;n<1000;n++)

{ usleep(20);

ch = IORD_ALTERA_AVALON_UART_STATUS(UART_0_BASE);

// if received some byte, read it

if ((ch&0x80)==0x80)

{ ch = IORD_ALTERA_AVALON_UART_RXDATA(UART_0_BASE);

rx_buf[rx_cnt]= ch;

rx_cnt++;

}

}

// print the bytes to terminal

if (rx_cnt>0)

{ alt_printf("rx_data:");

for(n=0;n<rx_cnt;n++)

{ alt_printf("%x ",rx_buf[n]);

}

alt_printf("\n");

}

}

return 0;

}

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Jan Naceradsky, Czech Republic