[ECOS] Serial driver

[Tathagata Das]

Hi Andrew,
Thank you very much for your reply.
For my problem 1 :
  You are right. I want to echo that character. Please tell me how can I 
enable echo.
I am not using any tty layer.
I am sending you DEVTAB_ENTRY for your reference.

DEVTAB_ENTRY(   test_serial_iol,
                /dev/ser0,
                0,
                &cyg_io_serial_devio,
                test_serial_init,
                test_serial_lookup,     // Serial driver may need 
initializing
                &test_serial_channel
    );
I only use this single entry. Hope , i do not need two entries (one for 
RX and one for TX). Single entry should be good enough.

Also      CYGDAT_IO_SERIAL_TTY_CONSOLE = /dev/ser0
Please tell me how can I use tty layer so that I get the echo support.

For my problem 2 :
Yes you are again right. It tries to read a block. But why ?
My scanf is like this  ---- scanf("%c", &c); SO it should try to read 
single character.
But i have noticed that size = 256 in "while (size< *len) {".
Please tell me why the control does not come out and why I am not able 
to print the value of variable 'c'.

Thanks in advance

Regards,
Tatha

   

Andrew Lunn wrote:

>On Mon, Aug 14, 2006 at 11:35:32AM +0530, Tathagata Das wrote:
>  
>
>>Hi ,
>>       I am using two different IRQ number for RX and TX in serial driver.
>>
>>My init function of serial driver looks like this ---
>>
>>static bool test_serial_init(struct cyg_devtab_entry *tab)
>>{
>>       serial_channel *chan = (serial_channel *)tab->priv;
>>       (chan->callbacks->serial_init)(chan);  // Really only required 
>>for interrupt driven devices
>>
>>       /* Allocate the IRQs */
>>       if (chan->out_cbuf.len != 0) {
>>               /* TX interrupt */
>>               cyg_drv_interrupt_create(TX_IRQ,
>>                                        0,                             
>>// IRQ priority
>>                                        (cyg_addrword_t)chan,          
>>// Data item passed to interrupt handler
>>                                        &test_tx_serial_ISR,
>>                                        &test_tx_serial_DSR,
>>                                        &tx_serial_interrupt_handle,
>>                                        &tx_serial_interrupt);
>>               cyg_drv_interrupt_attach(tx_serial_interrupt_handle);
>>               cyg_drv_interrupt_unmask(TX_IRQ);
>>       }
>>       if (chan->in_cbuf.len != 0) {
>>               /* RX interrupt */
>>               cyg_drv_interrupt_create(RX_IRQ,
>>                                        0,                             
>>// IRQ priority
>>                                        (cyg_addrword_t)chan,          
>>// Data item passed to interrupt handler
>>                                        &test_rx_serial_ISR,
>>                                        &test_rx_serial_DSR,
>>                                        &rx_serial_interrupt_handle,
>>                                        &rx_serial_interrupt);
>>               cyg_drv_interrupt_attach(rx_serial_interrupt_handle);
>>               cyg_drv_interrupt_unmask(RX_IRQ);
>>       }
>>
>>       return true;
>>}
>>
>>My problems are :
>>
>>         1. when I press any key from keyboard test_rx_serial_ISR and 
>>test_rx_serial_DSR are called one by one.
>>               But that charcter is not displayed.
>>    
>>
>
>You mean there is no echo? Do you have echo'ing enabled? Are you even
>using the tty layer in eCos which provides echo support?
>
>  
>
>>         2.  In scanf function --- control is stuck into " while (size 
>>< *len) {" this loop in serial_read function.
>>    
>>
> 
>So this layer is trying to read a block of charactors, not a single
>charactor read. Nothing wrong here.
>
>You might want to read more of 
>http://ecos.sourceware.org/docs-latest/ref/io-serial-driver-details.html
>
>It sounds like you want to use the tty driver.
>
>   Andrew
>  
>

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