AOpen WARM TOUCH Manual page 29

收銀機控制命令舉例
在 DOS 或 Windows98 下面使用 Debug.EXE 程式項目
4-7. Gravity Vector Seneor's GPIO 針腳軟體配置
1. Set PCH_GPIO6, PCH_GPIO7 as GPIO pins mode
in byte_value, 0x0501
and byte_value, 0x3f
or byte_value, 0xc0
out 0x0501, byte_value
2. Set PCH_GPIO6, PCH_GPIO7 as Input pins mode
in byte_value, 0x0504
and byte_value, 0x3f
or byte_value, 0xc0
out 0x0504, byte_value
3. Read PCH_GPIO6, PCH_GPIO7 status to know the gravity vector.
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