22 lines
423 B
ArmAsm
22 lines
423 B
ArmAsm
; Helpers for serial ports which pretty much have to to be
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; written in asm
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global serialport_write_byte
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global serial_read_byte
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; write a byte
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;serialport_write_byte
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serialport_write_byte:
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mov al, [esp+8]
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mov dx, [esp+4]
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out dx, al
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ret
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; Read byte from serial port
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;serialport_read_byte
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serial_read_byte:
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mov dx, [esp + 4] ; grab the address of the targeted port
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in al, dx ; read byte from the port
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ret
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