Aaeon PCM-QM77 Manuale Utente Scaricare il pdf (Pagina 171)

Compact Board PCM-QM77

Appendix E Digital I/O F-8

out dx, al

mov dx, 0f040h + 05h

mov al, ah

out dx, al

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

mov al, 48h ; Start a byte access

out dx, al

call CT_Chk_SMBus_Ready

ret

Ct_I2CWriteByte Endp

; Wait until the busy bit clears, indicating that the SMBUS

; activity has concluded.

CT_Chk_SMBus_Ready Proc Near

mov dx,0f040h+ 0;status port

clc

mov cx,0800h

Chk_I2c_OK:

in al,dx ;get status

call Delay5ms

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