GPIO
Parameters:
ui32Port is the base address of the GPIO port.
ui8Pin is the pin number.
Description:
This function gets the direction and control mode for a specified pin on the selected GPIO port.
The pin can be configured as either an input or output under software control, or it can be under
hardware control. The type of control and direction are returned as an enumerated data type.
Returns:
Returns one of the enumerated data types described for ROM_GPIODirModeSet().
10.2.1.4 ROM_GPIODirModeSet
Sets the direction and mode of the specified pin(s).
Prototype:
void
ROM_GPIODirModeSet(uint32_t ui32Port,
uint8_t ui8Pins,
uint32_t ui32PinIO)
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_GPIODirModeSet is a function pointer located at ROM_GPIOTABLE[1].
Parameters:
ui32Port is the base address of the GPIO port
ui8Pins is the bit-packed representation of the pin(s).
ui32PinIO is the pin direction and/or mode.
Description:
This function will set the specified pin(s) on the selected GPIO port as either an input or output
under software control, or it will set the pin to be under hardware control.
The parameter ui32PinIO is an enumerated data type that can be one of the following values:
GPIO_DIR_MODE_IN
GPIO_DIR_MODE_OUT
GPIO_DIR_MODE_HW
where GPIO_DIR_MODE_IN specifies that the pin is programmed as a software controlled
input, GPIO_DIR_MODE_OUT specifies that the pin is programmed as a software controlled
output, and GPIO_DIR_MODE_HW specifies that the pin is placed under hardware control.
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:
ROM_GPIOPadConfigSet() must also be used to configure the corresponding pad(s) in order
for them to propagate the signal to/from the GPIO.
90 April 8, 2013
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