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Altera_Forum's avatar
Altera_Forum
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15 years ago

DE2 -- UART transmit and receive compiling error

Hi all, I'm using the DE2 kit, with Quartus II (using SOPC) and NIOS IDE software to make an UART communication. But the compilation was always failed. Does anyone know how I can work arou...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I can give you my functions I used to test the Uart. Maybe these can help you to find the problem.

void init_uart(int BAUD)

{

int divi;

divi = (100000000 / BAUD) + 0.5;

IOWR_16DIRECT(RS232_INST_BASE, 0x14, divi);

}

void write_uart(char x)

{

unsigned long status = 0;

while((status & 0x00000040) != 0x00000040)

{

status = IORD_ALTERA_AVALON_UART_STATUS(RS232_INST_BASE);

}

IOWR_ALTERA_AVALON_UART_TXDATA(RS232_INST_BASE, x);

}

char read_uart(void)

{

char x;

x = IORD_ALTERA_AVALON_UART_RXDATA(RS232_INST_BASE);

return x;

}