GPIO
Parameters:
ui32Port is the base address of the GPIO port.
ui8Pins is the bit-packed representation of the pin(s).
Description:
The values at the specified pin(s) are read, as specified by ui8Pins. Values are returned for
both input and output pin(s), and the value for pin(s) that are not specified by ui8Pins are set
to 0.
The pin(s) are specified using a bit-packed byte, where each bit that is set identifies the pin to
be accessed, and where bit 0 of the byte represents GPIO port pin 0, bit 1 represents GPIO
port pin 1, and so on.
Returns:
Returns a bit-packed byte providing the state of the specified pin, where bit 0 of the byte
represents GPIO port pin 0, bit 1 represents GPIO port pin 1, and so on. Any bit that is not
specified by ui8Pins is returned as a 0. Bits 31:8 should be ignored.
10.2.1.13 ROM_GPIOPinTypeADC
Configures pin(s) for use as analog-to-digital converter inputs.
Prototype:
void
ROM_GPIOPinTypeADC(uint32_t ui32Port,
uint8_t ui8Pins)
ROM Location:
ROM_APITABLE is an array of pointers located at 0x0100.0010.
ROM_GPIOTABLE is an array of pointers located at ROM_APITABLE[4].
ROM_GPIOPinTypeADC is a function pointer located at ROM_GPIOTABLE[23].
Parameters:
ui32Port is the base address of the GPIO port.
ui8Pins is the bit-packed representation of the pin(s).
Description:
The analog-to-digital converter input pins must be properly configured to function correctly.
This function provides the proper configuration for those pin(s).
The pin(s) are specified using a bit-packed byte, where each bit that is set identifies the pin to
be accessed, and where bit 0 of the byte represents GPIO port pin 0, bit 1 represents GPIO
port pin 1, and so on.
Note:
This cannot be used to turn any pin into an ADC input; it only configures an ADC input pin for
proper operation.
Returns:
None.
96 April 8, 2013
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