Aaeon PCM-QM77 Manual do Utilizador descarregar pdf (Página 170)

Compact Board PCM-QM77

Appendix E Digital I/O F-7

Ct_I2CReadByte Endp

;Input : CL - register index

; CH - device ID

; AL - Value to write

;Output: none

Ct_I2CWriteByte Proc Near

mov ch,06eh

xchg ah, al

mov dx, 0f040h + 00h ; Host Control Register

mov al, 0ffh ; Clear previous

commands

out dx, al

call Delay5ms

mov dx, 0f040h + 04h ; Transmit Slave Address

Register

mov al, ch ; Set the slave address and

out dx, al ; prepare for a WRITE

command

mov dx, 0f040h + 03h ; Host Command Register

mov al, cl ; offset to write

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