GPIO
Note:
This cannot be used to turn any pin into a USB pin; it only configures a USB pin for proper
operation.
Returns:
None.
10.2.1.27 ROM_GPIOPinTypeUSBDigital
Configures pin(s) for use by the USB peripheral.
Prototype:
void
ROM_GPIOPinTypeUSBDigital(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_GPIOPinTypeUSBDigital is a function pointer located at ROM_GPIOTABLE[24].
Parameters:
ui32Port is the base address of the GPIO port.
ui8Pins is the bit-packed representation of the pin(s).
Description:
Some USB digital pins must be properly configured for the USB peripheral to function correctly.
This function provides a typical configuration for the digital USB pin(s); other configurations may
work as well depending upon the board setup (for example, using the on-chip pull-ups).
This function should only be used with EPEN and PFAULT pins as all other USB pins are
analog in nature or are not used in devices without OTG functionality.
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 a USB pin; it only configures a USB pin for proper
operation.
Returns:
None.
10.2.1.28 ROM_GPIOPinWrite
Writes a value to the specified pin(s).
Prototype:
void
ROM_GPIOPinWrite(uint32_t ui32Port,
uint8_t ui8Pins,
uint8_t ui8Val)
April 8, 2013 105
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