[ECOS] Serial Driver (Interrupt Mode) for PXA250

[Gary Thomas]

Himanshu Patel wrote:
> ----- Original Message ----- 
> From: Himanshu Patel
> To: ecos-discuss@ecos.sourceware.org
> Sent: Tuesday, August 22, 2006 6:17 PM
> Subject: Re: [ECOS] Serial Driver (Interrupt Mode) for PXA250
> 
> 
> Hi,
> 
> Any ideas? Let me know if any additional information is required.

Why aren't you just using the generic 16x5x driver?  Look at how I
did it for the uE250 which is another PXA250 based system.

> 
> Regards,
> 
> Himanshu Patel
> ----- Original Message ----- 
> From: Himanshu Patel
> To: ecos-discuss@ecos.sourceware.org
> Sent: Monday, August 21, 2006 7:11 PM
> Subject: [ECOS] Serial Driver (Interrupt Mode) for PXA250
> 
> 
> Hi,
> 
> I am working on PXA250 development board.  ISR (and hence DSR) is not
> getting fired for FFUART (Serial Driver works well in Polling Mode).
> 
> Sending herewith code for Initialization and Configuration for reference:
> 
> #define PXA2X0_FFUART0     0x40100000
> #define CYGNUM_HAL_INTERRUPT_USART0  (22)
> 
> static bool triton_serial_config_port(serial_channel *chan,
> cyg_serial_info_t *new_config, bool init)
> {
>     triton_serial_info *triton_chan = (triton_serial_info *)chan->dev_priv;
>     CYG_ADDRWORD base = triton_chan->base;
>    cyg_uint32 baudrate;
>  cyg_uint32 parity = select_parity((cyg_uint32) new_config->parity);
>     cyg_uint32 word_length = select_word_length((cyg_uint32)
> new_config->word_length);
>     cyg_uint32 stop_bits = select_stop_bits((cyg_uint32) new_config->stop);
>     if ((word_length == 0xFF) || (parity == 0xFF) || (stop_bits == 0xFF))
>  {
>         return false;  // Unsupported configuration
>     }
>  // Enable Divisor Latch Access Bit in Line Control Register.
>  HAL_WRITE_UINT32(base + PXA2X0_UART_LCR, PXA2X0_UART_LCR_DLAB);
>  baudrate = select_baudrate((cyg_uint32) new_config->baud);
>  // Divisor Latch Low Register
>  HAL_WRITE_UINT32(base + PXA2X0_UART_DLL, (baudrate & 0xFF));
>  // Divisor Latch High Register
>  HAL_WRITE_UINT32(base + PXA2X0_UART_DLH, ((baudrate & 0xFF00) >> 8));
>  // Disable Divisor Latch Access Bit in Line Control Register.
>  // Reset the Line Control Register.
>  HAL_WRITE_UINT32(base + PXA2X0_UART_LCR, 0x00);
>  // Configure Line Control Register
>  HAL_WRITE_UINT32(base + PXA2X0_UART_LCR, parity | word_length | stop_bits);
>  // Disable UART interrupts.
>  HAL_WRITE_UINT32(base + PXA2X0_UART_IER, 0x00000000);
>  // Enable UART Unit.
>  HAL_WRITE_UINT32(base + PXA2X0_UART_IER, PXA2X0_UART_IER_UUE);
> #if CYGNUM_IO_SERIAL_ARM_TRITON_SERIAL0_BUFSIZE > 0
>  // Enable Transmit and Receive FIFO
>  HAL_WRITE_UINT32(base + PXA2X0_UART_FCR, PXA2X0_UART_FCR_FCR0 |
> PXA2X0_UART_FCR_FCR1 | PXA2X0_UART_FCR_FCR2);
>  // Enable Transmit, Receive interrupt.
>  HAL_WRITE_UINT32(base + PXA2X0_UART_IER, PXA2X0_UART_IER_TIE |
> PXA2X0_UART_IER_RAVIE | PXA2X0_UART_IER_UUE);
> #endif
>  return true;
> }
> 
> static bool triton_serial_init(struct cyg_devtab_entry *tab)
> {
>     serial_channel *chan = (serial_channel *)tab->priv;
>     triton_serial_info *triton_chan = (triton_serial_info *) chan->dev_priv;
>     int res;
> #ifdef CYGDBG_IO_INIT
>     diag_printf("TRITON SERIAL init - dev: %x.%d\n", triton_chan->base,
> triton_chan->int_num);
> #endif
>  // Really only required for interrupt driven devices.
>     (chan->callbacks->serial_init)(chan);
>   if(chan->out_cbuf.len != 0)
>   {
>       cyg_drv_interrupt_create(triton_chan->int_num,
>                                  4, // Priority
>                                  (cyg_addrword_t)chan, // Data item passed
> to interrupt handler
>                                  (cyg_ISR_t *)&triton_serial_ISR,
>                                  (cyg_DSR_t *)&triton_serial_DSR,
>                                  &triton_chan->serial_interrupt_handle,
>                                  &triton_chan->serial_interrupt);
>         cyg_drv_interrupt_attach(triton_chan->serial_interrupt_handle);
>         cyg_drv_interrupt_unmask(triton_chan->int_num);
>     }
>     res = triton_serial_config_port(chan, &chan->config, true);
>     return res;
> }
> 
> Any help would be greatly appreciated.
> 
> Regards,
> 
> Himanshu Patel
> 
> 


-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------

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