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start work on serial

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This commit is contained in:
Eggert Jung
2025-04-20 23:59:40 +02:00
parent f03e33928b
commit adbe5934fa
2 changed files with 37 additions and 25 deletions
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34
arch/serial.cc
View File

@@ -1,18 +1,23 @@
#include "serial.h"
#include "ioport.h"
Serial::Serial(ComPort port, BaudRate baud_rate, DataBits data_bits,
StopBits stop_bits, Parity parity)
: port(port) {
// initialize FIFO mode, no irqs for sending, irq if first byte was received
writeReg(INTERRUPT_ENABLE_REGISTER, RECEIVED_DATA_AVAILABLE);
// line control, select r/w of divisor latch register
writeReg(LINE_CONTROL_REGISTER, DIVISOR_LATCH_ACCESS_BIT);
// TODO: Implement here the correct handling of input arguments
(void)baud_rate;
(void)data_bits;
(void)stop_bits;
(void)parity;
writeReg(DIVISOR_LOW_REGISTER, baud_rate & 0xFF);
writeReg(DIVISOR_HIGH_REGISTER, (baud_rate>>8) & 0xFF);
// also turns DLAB off
uint8_t val = parity;
val |= stop_bits;
val |= data_bits;
writeReg(LINE_CONTROL_REGISTER, val);
// FIFO: Enable & clear buffers
writeReg(FIFO_CONTROL_REGISTER,
@@ -23,19 +28,22 @@ Serial::Serial(ComPort port, BaudRate baud_rate, DataBits data_bits,
}
void Serial::writeReg(RegisterIndex reg, char out) {
// TODO: Implement
(void)reg;
(void)out;
uint16_t addr = port;
IOPort iop = IOPort(addr += reg);
iop.outb(out);
}
char Serial::readReg(RegisterIndex reg) {
// TODO: Implement
(void)reg;
return '\0';
uint16_t addr = port;
IOPort iop = IOPort(addr += reg);
return iop.inb();
}
int Serial::write(char out) {
// TODO: Implement
(void)out;
return 0;
if(readReg(LINE_STATUS_REGISTER) & TRANSMITTER_EMPTY){
writeReg(TRANSMIT_BUFFER_REGISTER, out);
return out;
}
return -1;
}

28
main.cc
View File

@@ -4,6 +4,7 @@
#include "arch/cga.h"
#include "arch/textwindow.h"
#include "arch/serial.h"
// Main function
// (the bootstrap processor starts here)}
@@ -19,19 +20,22 @@ extern "C" int main() {
//for(uint8_t i = 0; i < 10; i++)
// CGA::show(i, i, i+0x30, CGA::Attribute());
//test textwindow implemantation
TextWindow tw_global = TextWindow(0, 80, 0, 25, true);
tw_global.reset(' ', CGA::Attribute(CGA::LIGHT_GREEN, CGA::BLUE, false));
////test textwindow implemantation
//TextWindow tw_global = TextWindow(0, 80, 0, 25, true);
//tw_global.reset(' ', CGA::Attribute(CGA::LIGHT_GREEN, CGA::BLUE, false));
//TextWindow tw = TextWindow(0, 10, 0, 10, true);
//tw.reset();
//tw.setPos(0,0);
//tw.print("lorem ipsum dolor sit amit", 26);
//tw.setPos(0,-1);
//tw.print("test", 4, CGA::Attribute(CGA::BLACK, CGA::BLUE));
//int x,y;
//tw.getPos(x,y);
//tw.setPos(x+1,y);
TextWindow tw = TextWindow(0, 10, 0, 10, true);
tw.reset();
tw.setPos(0,0);
tw.print("lorem ipsum dolor sit amit", 26);
tw.setPos(0,-1);
tw.print("test", 4, CGA::Attribute(CGA::BLACK, CGA::BLUE));
int x,y;
tw.getPos(x,y);
tw.setPos(x+1,y);
//test Serial
Serial s = Serial();
s.write('a');
/* Start application processors
* To avoid unexpected behaviour, make sure that interrupts are not