Uart data ready

Be sure that uart_base matches to your SOPC UART_BASE :

maybe you have changed your sopc (in Quartus SOPC Builder) and you have forgotten to rebuild your "system library" (I don't know the exact name in NIOS > 9.1, perhaps "BSP" :confused:) in NIOS IDE (or SBT or ...)

Hi again,

It seems that the foloowing statement does not return the proper status bits.

status = IORD_ALTERA_AVALON_UART_STATUS(UART_BASE);

Are there any specific functions that can mess with the status bits? Do I need to initialize something in particular for this to work? Any special includes?

I would appreciate some help!!!

Thanks for the replies. Unfortunately I still didn't get the code to work, the if statement returns remains false... Does anyone have any suggestions?

BTW, it should read: if (status & altera_avalon_uart_status_rrdy_msk) instead ofif (status & altera_avalon_uart_control_rrdy_msk).

--- Quote Start ---

status = IORD_ALTERA_AVALON_UART_STATUS(UART_BASE);

if (status & ALTERA_AVALON_UART_CONTROL_RRDY_MSK)

{

}

--- Quote End ---

In this IF statement,you have put ' & ' operator which is not logical and.It is bitwise and,so any value except 0x00,will cause to go into IF body

I think you should compare your IF result to some specific hex value that you want to get

Ex: if ( status & ALTERA_AVALON_UART_CONTROL_RRDY_MSK == 0x..)

{

temp_read= read_data;

}

To test if there is data ready to be read I use the following code.

status = IORD_ALTERA_AVALON_UART_STATUS(UART_BASE);

if (status & ALTERA_AVALON_UART_CONTROL_RRDY_MSK)

{

}

However, it seems that the if statement is false even when there is data available. Can anyone help?