/**
* 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);
}
/*
** _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" );
}