UART interrupt not working

mpc8377e — Tue, 03 Apr 2012 20:49:40 GMT

Hi,

I am trying to use interrupt on UART3. I have configured user_config.h as below :

#define BSPCFG_ENABLE_TTYD 0

#define BSPCFG_ENABLE_ITTYD 1

#define BSP_DEFAULT_IO_CHANNEL "ittyd:"

#define BSP_DEFAULT_IO_CHANNEL_DEFINED

and also update twrk40x256.h with following:

#ifndef BSP_DEFAULT_IO_CHANNEL
#if BSPCFG_ENABLE_TTYD
#define BSP_DEFAULT_IO_CHANNEL "ittyd:"
#define BSP_DEFAULT_IO_CHANNEL_DEFINED

The problem i am facing is that the when some data is sent from host on UART the interrupt is not triggered.

Part of application which installs ISR and some code in ISR:

#define RS485_CHANNEL "ittyd:"

func()
{

rs485_dev = fopen( RS485_CHANNEL, (char const *)IO_SERIAL_HW_485_FLOW_CONTROL );
#else
/* HW 485 flow not available on chip */
rs485_dev = fopen( RS485_CHANNEL, NULL );
#endif
if( rs485_dev == NULL )
{
/* device could not be opened */
_task_block();
}
if( result == IO_ERROR_INVALID_IOCTL_CMD )
{
_task_block();
}
_int_install_isr(INT_UART3_RX_TX, uart3_rx_tx_isr, NULL);
err = _io_ioctl(rs485_dev, IO_IOCTL_SERIAL_SET_BAUD, &ulBaudRate);
err = _io_ioctl(rs485_dev, IO_IOCTL_SERIAL_SET_DATA_BITS, &ucDataBits);
err = _io_ioctl(rs485_dev, IO_IOCTL_SERIAL_SET_STOP_BITS, &ucStopBits);
}

void
uart3_rx_tx_isr( pointer user_isr_ptr )
{
UBYTE ubUDR; /* TODO: Get byte from UART. */;

/* optional to open device again*/
rs485_dev = fopen( RS485_CHANNEL, NULL );
if( rs485_dev == NULL )
{
/* device could not be opened */
_task_block();
}

if (fstatus( rs485_dev ))
{
ubUDR = fgetc( rs485_dev );
}
}

Can some one help getting ISR triggered when there is some data on UART3?

/Raghu

Re: UART interrupt not working

c0170 — Tue, 03 Apr 2012 21:45:50 GMT

Hi mpc8377e,

#if BSPCFG_ENABLE_TTYD
#define BSP_DEFAULT_IO_CHANNEL "ittyd:"

change condition to BSPCFG_ENABLE_ITTYD. You only added interrupt into the MQX.

Use those 2 functions for cortex to initialize and enable interrupt vector.

_cortex_int_init();
_cortex_int_enable();

Regards,

MartinK

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