Changing between I2C and GPIO in the same application

Question

My program is a test system. It should first set SCL=1, SDA=0. Read some values from other GPIOs. Then set SCL=0, SDA=1. Read some values from other GPIOs. This is in order to verify the integrity of the test system. THEN it should switch to I2C mode and try to do I2C communication.

How do I switch between GPIO-mode and I2C-mode in the same program ?. I am writing the test program in PYTHON, but I think the problem would be the same in C.

Can anyone advise ?

BR Erik

Answer 1

I know you can do this with pigpio. I am not sure about the other Python modules.

SDA=2
SCL=3

pi = pigpio.pi()
if not pi.connected:
   exit()

pi.write(SCL, 1) # automatically sets mode to WRITE
pi.write(SDA, 0) # automatically sets mode to WRITE

# read/write other GPIO

pi.write(SCL, 0)
pi.write(SDA, 1)

# read/write other GPIO

pi.set_mode(SDA, pigpio.ALT0) # set into I2C mode
pi.set_mode(SCL, pigpio.ALT0) # set into I2C mode

# Do an I2C transfer

pi.stop()