#define FOOLOS_MODULE_NAME "serial"
#include "serial.h"

#define PORT 0x3f8   /* COM1 */

void serial_init() {

   x86_outb(PORT + 1, 0x00);    // Disable all interrupts
   x86_outb(PORT + 3, 0x80);    // Enable DLAB (set baud rate divisor)
   x86_outb(PORT + 0, 0x03);    // Set divisor to 3 (lo byte) 38400 baud
   x86_outb(PORT + 1, 0x00);    //                  (hi byte)
   x86_outb(PORT + 3, 0x03);    // 8 bits, no parity, one stop bit
   x86_outb(PORT + 2, 0xC7);    // Enable FIFO, clear them, with 14-byte threshold
   x86_outb(PORT + 4, 0x0B);    // IRQs enabled, RTS/DSR set

//   log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"COM 1 - initialized");
}

int serial_received() {
   return x86_inb(PORT + 5) & 1;
}
 
char serial_read() {
   while (serial_received() == 0);
   return x86_inb(PORT);
}

int is_transmit_empty() {
   return x86_inb(PORT + 5) & 0x20;
}
 
void serial_write(char a) {
   while (is_transmit_empty() == 0);
   x86_outb(PORT,a);
}