AAEON TKS-G21-CV05 - Manual (Page 63)

E m b e d d e d B o x T K S - G 2 1 - C V 0 5
Appendix C Digital I/O C-8
out dx, al
mov dx, 0f000h + 05h
mov al, ah
out dx, al
mov dx, 0f000h + 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,0f000h+ 0;status port
clc
mov cx,0800h
Chk_I2c_OK:
in al,dx ;get status
call Delay5ms