GPIO
where GPIO_PIN_TYPE_STD∗ specifies a push-pull pin, GPIO_PIN_TYPE_OD∗ specifies an
open-drain pin, ∗_WPU specifies a weak pull-up, ∗_WPD specifies a weak pull-down, and
GPIO_PIN_TYPE_ANALOG specifies an analog input.
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:
None.
10.2.1.11 ROM_GPIOPinConfigure
Configures the alternate function of a GPIO pin.
Prototype:
void
ROM_GPIOPinConfigure(uint32_t ui32PinConfig)
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_GPIOPinConfigure is a function pointer located at ROM_GPIOTABLE[26].
Parameters:
ui32PinConfig is the pin configuration value, specified as only one of the GPIO_P??_???
values.
Description:
This function configures the pin mux that selects the peripheral function associated with a
particular GPIO pin. Only one peripheral function at a time can be associated with a GPIO
pin, and each peripheral function should only be associated with a single GPIO pin at a time
(despite the fact that many of them can be associated with more than one GPIO pin).
Returns:
None.
10.2.1.12 ROM_GPIOPinRead
Reads the values present of the specified pin(s).
Prototype:
int32_t
ROM_GPIOPinRead(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_GPIOPinRead is a function pointer located at ROM_GPIOTABLE[11].
April 8, 2013 95
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