Exemple #1
0
/**
 * Initializes the serial controller.
 */
void sio_init( void ) {
	/*
	** Select bank 1 and set the data rate.
	*/
	__outb( UA4_LCR, UA4_LCR_BANK1 );
	__outb( UA4_LBGD_L, BAUD_LOW_BYTE( BAUD_9600 ) );
	__outb( UA4_LBGD_H, BAUD_HIGH_BYTE( BAUD_9600 ) );

	/*
	** Select bank 0, and at the same time set the LCR for our
	** data characteristics.
	*/
	__outb( UA4_LCR, UA4_LCR_BANK0 | UA4_LCR_BITS_8 |
	    UA4_LCR_1_STOP_BIT | UA4_LCR_NO_PARITY );
	/*
	** Set Modem Control Register to send and receive
	** This is necessary to receive data from the ADDS terminals
	*/
	__outb( UA4_MCR, UA4_MCR_DTR | UA4_MCR_RTS |
	        UA4_MCR_ISEN );

	__install_isr(INT_VEC_SERIAL_PORT_1, io_interrupt_handler);

	__outb(UA4_IER, UA4_IER_RX_INT_ENABLE | UA4_IER_TX_INT_ENABLE);
}
Exemple #2
0
/*
** _init_sio
**
** Initialize the UART chip.
*/
void _init_sio( void ) {

	//
	// Initialize SIO variables.
	//

	_memclr( (void *) g_inbuffer, sizeof(g_inbuffer) );
	g_inlast = g_innext = g_inbuffer;
	g_incount = 0;

	_memclr( (void *) g_outbuffer, sizeof(g_outbuffer) );
	g_outlast = g_outnext = g_outbuffer;
	g_outcount = 0;
	g_sending = 0;

	//
	// Next, initialize the UART.
	//

	// Initialize the FIFOs
	//
	// this is a bizarre little sequence of operations

	__outb( UA4_FCR, 0x20 );
	__outb( UA4_FCR, 0x00 );		// reset
	__outb( UA4_FCR, UA5_FCR_FIFO_EN );	// 0x01
	__outb( UA4_FCR, UA5_FCR_FIFO_EN |
			 UA5_FCR_RXSR );	// 0x03
	__outb( UA4_FCR, UA5_FCR_FIFO_EN |
			 UA5_FCR_RXSR |
			 UA5_FCR_TXSR );	// 0x07

	// disable interrupts

	__outb( UA4_IER, 0 );

	// select bank 1 and set the data rate

	__outb( UA4_LCR, UA4_LCR_BANK1 );
	__outb( UA4_LBGD_L, BAUD_LOW_BYTE( BAUD_9600 ) );
	__outb( UA4_LBGD_H, BAUD_HIGH_BYTE( BAUD_9600 ) );

	// Select bank 0, and at the same time set the LCR for our
	// data characteristics.

	__outb( UA4_LCR, UA4_LCR_BANK0 |
			 UA4_LCR_BITS_8 |
			 UA4_LCR_1_STOP_BIT |
			 UA4_LCR_NO_PARITY );
	
	// Set the ISEN bit to enable the interrupt request signal.

	__outb( UA4_MCR, UA4_MCR_ISEN | UA4_MCR_DTR | UA4_MCR_RTS );

	// Install our ISR

	__install_isr( INT_VEC_SERIAL_PORT_1, _isr_sio );

	// Enable device interrupts.

	__outb( UA4_IER, UA4_IER_TX_INT_ENABLE | UA4_IER_RX_INT_ENABLE );

	// Report that we're done.

	c_puts( " sio" );

}