40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
#include <kernel/chroma.h>
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#define SERIAL_DATA(base) (base)
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#define SERIAL_DLAB(base) (base + 1)
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#define SERIAL_FIFO(base) (base + 2)
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#define SERIAL_LINE(base) (base + 3)
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#define SERIAL_MODEM(base) (base + 4)
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#define SERIAL_LINE_STATUS(base) (base + 5)
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#define COM1 0x3F8
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void InitSerial() {
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// Disable interrupts
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WritePort(SERIAL_DLAB(COM1), 0x00, 1);
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// Set baud rate to /3 (115200 bits/sec)
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WritePort(SERIAL_LINE(COM1), 0x80, 1);
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WritePort(SERIAL_DATA(COM1), 0x03, 1);
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WritePort(SERIAL_DLAB(COM1), 0x00, 1);
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// Set serial to 8 bits, no parity and one stop bit.
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WritePort(SERIAL_LINE(COM1), 0x03, 1);
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// Enable FIFO and clear all buffers
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WritePort(SERIAL_FIFO(COM1), 0xC7, 1);
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// Enable IRQs, set RTS and DSR
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WritePort(SERIAL_MODEM(COM1), 0x03, 1);
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}
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int CheckSerial() {
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return ReadPort(SERIAL_LINE_STATUS(COM1), 1);
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}
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void WriteSerialChar(const char chr) {
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while(!(CheckSerial() & 0x20));
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WritePort(COM1, chr, 1);
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}
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void WriteSerialString(const char* str, size_t len) {
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for(size_t i = 0; i < len; i++) {
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WriteSerialChar(str[i]);
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}
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} |