1. FPIOA Example

1. Overview

IOMUX is mainly used to configure the functions of physical pins (PAD). In a SoC, due to the large number of functions and limited number of pins, multiple functions may share the same I/O pin. However, at any given time, a pin can only carry one function, so it is necessary to select the function through IOMUX (also known as FPIOA, Pin multiplexing, pin function selection, etc.).

2. Example

The following code demonstrates how to use the FPIOA module to set and query the functions of pins:

from machine import FPIOA

# Instantiate FPIOA object
fpioa = FPIOA()

# Print the configuration status of all pins
fpioa.help()

# Print the detailed configuration of a specific pin (Pin0)
fpioa.help(0)

# Print all available pins corresponding to a specific function (e.g., IIC0_SDA)
fpioa.help(FPIOA.IIC0_SDA, func=True)

# Set Pin0 to GPIO0
fpioa.set_function(0, FPIOA.GPIO0)

# Set Pin2 to GPIO2 and configure other options simultaneously
fpioa.set_function(2, FPIOA.GPIO2, ie=1, oe=1, pu=0, pd=0, st=1, sl=0, ds=7)

# Get the current pin number for a specific function (e.g., UART0_TXD)
fpioa.get_pin_num(FPIOA.UART0_TXD)

# Get the current function configuration of a specific pin (Pin0)
fpioa.get_pin_func(0)

Tip

For specific interface descriptions of the FPIOA module, please refer to the API documentation.