1.8.13.2 1.25.10.2 1.26.9.2 1.27.11.2 1.28.13.2 1.34.10.2 1.35.8.2 1.36.11.2 1.41.12.2 1.42.10.2 PIO_PortRead Function
C
uint32_t PIO_PortRead(PIO_PORT port)
Summary
Read all the I/O lines of the selected port port.
Description
This function reads the live data values on all the I/O lines of the selected port. Bit values returned in each position indicate corresponding pin levels.
-
1 - Pin is high.
-
0 - Pin is low.
This function reads the value regardless of pin configuration, whether it is set as as an input, driven by the PIO Controller, or driven by a peripheral.
Precondition
Reading the I/O line levels requires the clock of the PIO Controller to be enabled, otherwise this API reads the levels present on the I/O line at the time the clock was disabled.
Parameters
Param | Description |
---|---|
port | One of the IO ports from the enum PIO_PORT |
Returns
Returns the read value of all the I/O lines of the selected port port.
Example
uint32_t value; value = PIO_PortRead(PIO_PORT_C);
Remarks
If the port has less than 32-bits, unimplemented pins will read as low (0). Implemented pins are Right aligned in the 32-bit return value.