53 lines
1.1 KiB
C++
53 lines
1.1 KiB
C++
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#ifndef _SERIAL_HPP
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#define _SERIAL_HPP
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#include <output.hpp>
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#include <io.h>
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#define SERIAL_IER 1
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#define SERIAL_IIR 2
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#define SERIAL_FCR 2
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#define SERIAL_LCR 3
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#define SERIAL_MCR 4
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#define SERIAL_LSR 5
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#define SERIAL_MSR 6
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namespace MTGosHAL {
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class Serial: public Output {
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private:
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uint16_t port;
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auto isTransmitEmpty() -> int {
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return inb(port+SERIAL_LSR)&0x20;
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}
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auto putChar(char chr) -> void {
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while(!isTransmitEmpty());
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outb(port, chr);
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}
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auto puts(const char* s) -> void {
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int i=0;
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while(s[i]!='\0')
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putChar(s[i++]);
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}
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public:
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Serial(uint32_t baud) {
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port=*((uint16_t*)0x0400);
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union {
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uint8_t b[2];
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uint16_t w;
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} divisor;
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divisor.w = 115200/baud;
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//Turn off interrupts
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outb(port+SERIAL_IER, 0x00);
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//Set DLAB-bit
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outb(port+SERIAL_LCR, 0x80);
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//Set baud divisor
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outb(port, divisor.b[0]);
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outb(port+1, divisor.b[1]);
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//Set bit count, parity and reset DLAB
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outb(port+SERIAL_LCR, 3);
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//Finish init
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outb(port+SERIAL_FCR, 0xC7);
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outb(port+SERIAL_MCR, 0x0B);
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}
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};
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}
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#endif
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