void
serial_cfg_baudrate(unsigned short com, unsigned short divisor)
{
/*
* Tell the serial controller that we are about to
* set the divisor of the baudrate. This is done
* by writing to the data register and interrupt
* enabling register. These two bytes will hold the
* divisor data WHILE the DLAB bit is set.
*/
outb(SERIAL_LINE_CMD_PORT(com), SERIAL_LINE_ENABLE_DLAB);
outb(SERIAL_DATA_PORT(com), (divisor >> 8) & 0x00FF);
outb(SERIAL_DATA_PORT(com), divisor & 0x00FF);
outb(SERIAL_LINE_CMD_PORT(com), 0x0);
}
int serial_write(char *buf, unsigned short com) {
serial_configure_baud_rate(com, 2);
serial_configure_line(com);
while(*buf != 0) {
if((serial_is_transmit_fifo_empty(com) & 0x20) == 0x00)
continue;
outb(SERIAL_DATA_PORT(com), *buf);
buf++;
}
return currPos;
}
void sprint(uint8_t* buf, uint16_t len){
if(is_configured == 1){
serial_configure_bit_rate(SERIAL_COM1_BASE, 1);
serial_configure_line(SERIAL_COM1_BASE);
serial_configure_fifo(SERIAL_COM1_BASE);
serial_configure_modem(SERIAL_COM1_BASE);
is_configured = 1;
}
for(unsigned int i = 0; i < len; i++){
while(serial_is_transmit_fifo_empty(SERIAL_COM1_BASE) == 0);
outb(SERIAL_DATA_PORT(SERIAL_COM1_BASE), buf[i]);
}
}
void serial_write(char * buf, int len)
{
int burst_length = (len < 14) ? len : 14;
int i = 0;
while (burst_length)
{
while (!serial_is_transmit_fifo_empty(SERIAL_COM1_BASE)) {};
for (i = 0; i < burst_length; ++i)
{
outb(SERIAL_DATA_PORT(SERIAL_COM1_BASE), *(buf + i));
}
buf += burst_length;
len -= burst_length;
burst_length = (len < 14) ? len : 14;
}
}
/** serial_configure_baud_rate:
* Sets the speed of the data being sent. The default speed of a serial
* port is 115200 bits/s. The argument is a divisor of that number, hence
* the resulting speed becomes (115200 / divisor) bits/s
*
* @param com The COM port to configure
* @param divisor The divisor
*/
void serial_configure_baud_rate(unsigned short com, unsigned short divisor)
{
outb(SERIAL_LINE_COMMAND_PORT(com), SERIAL_LINE_ENABLE_DLAB);
outb(SERIAL_DATA_PORT(com), (divisor >> 8) & 0x00FF);
outb(SERIAL_DATA_PORT(com), (divisor & 0x00FF));
}
void serial_configure_bit_rate(uint16_t com, uint16_t divisor){
outb(SERIAL_LINE_COMMAND_PORT(com), SERIAL_LINE_ENABLE_DLAB);
outb(SERIAL_DATA_PORT(com), (divisor >> 8) & 0x00FF);
outb(SERIAL_DATA_PORT(com), divisor & 0x00FF);
}
