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DRIVING AN ANALOG KEYBOARD WITH THE ST7 ADC

Then the analog channel to convert must be selected using CH3-CH0 bits of ADCCSR reg-

sister.

Then select the SPEED of conversion.

Setting the ADON bit will switch the converter on.

Figure 2. Flowchart: initialization of the ADC

Once a conversion is done, the EOC bit is set by hardware. It will be reset when the ADCDRH

register is read.

Once enabled, conversions will run continuously until the peripheral is disabled.

KBD_init

I/O Initialization

Channel Selection

SPEED Selection

ADC ON

return