49 lines
598 B
ArmAsm
49 lines
598 B
ArmAsm
section .text
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COM1 equ 0x3F8
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COM2 equ 0x2F8
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COM3 equ 0x3E8
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COM4 equ 0x2E8
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THR equ 0x0
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RBR equ 0x0
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IER equ 0x1
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IIR equ 0x2
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LCR equ 0x3
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MCR equ 0x4
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LSR equ 0x5
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MSR equ 0x7
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DLL equ 0x0
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DLH equ 0x0
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%macro COM_OUT 3
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mov dx, %1+%2
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mov al, %3
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out dx, al
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%endmacro
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%macro COM_IN 2
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mov dx, %1+%2
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in al, dx
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%endmacro
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global serial_init
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serial_init:
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COM_OUT COM1, IER, 0x00
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COM_OUT COM1, LCR, 0x80
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COM_OUT COM1, DLH, 0x00
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COM_OUT COM1, DLL, 0x0C
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COM_OUT COM1, LCR, 0x03
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ret
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global serial_write
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serial_write:
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push ebp
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mov ebp, esp
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mov ecx, [ebp + 8]
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COM_OUT COM1, THR, cl
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pop ebp
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ret
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