43 lines
793 B
C
43 lines
793 B
C
#include "uart.h"
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#include "port.h"
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static int _uart_setup_impl(int port)
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{
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port_write8(port + 1, 0x00);
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port_write8(port + 3, 0x80);
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port_write8(port + 0, 0x03);
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port_write8(port + 1, 0x00);
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port_write8(port + 3, 0x03);
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port_write8(port + 2, 0xC7);
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port_write8(port + 4, 0x0B);
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return 0;
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}
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void uart_init()
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{
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_uart_setup_impl(COM1);
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}
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static inline bool _uart_is_free_in(int port)
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{
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return port_read8(port + 5) & 0x01;
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}
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static inline bool _uart_is_free_out(int port)
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{
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return port_read8(port + 5) & 0x20;
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}
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int uart_write(uint8_t data)
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{
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while (!_uart_is_free_out(COM1)) { }
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port_write8(COM1, data);
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return 0;
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}
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int uart_read(uint8_t* data)
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{
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while (!_uart_is_free_out(COM1)) { }
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*data = port_read8(COM1);
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return 0;
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} |