Unable to configure pin 18 & 19 as GPIO output in ESP32S3 #16448
Description
Port, board and/or hardware
esp32 Port, Generic S3
MicroPython version
MicroPython V1.24
Reproduction
- Copy the code below into a .py file and run it (assuming you have a neopixel strip handy) and you get no data out on GPIO 19.
`import machine
import neopixel
Constants for IO MUX
IO_MUX_BASE = 0x60009000 # Base address for IO MUX
GPIO19_MUX_OFFSET = 0x4C # Offset for GPIO19
IO_MUX_GPIO19_REG = IO_MUX_BASE + GPIO19_MUX_OFFSET
Function to remap GPIO19
def remap_gpio19():
"""Remap GPIO19 to standard GPIO functionality."""
# Read the current value of the register
current_val = machine.mem32[IO_MUX_GPIO19_REG]
print(f"Initial IO MUX register value for GPIO19: 0x{current_val:08X}")
# Clear the MCU_SEL bits (bits [2:0]) and set to 0 (GPIO function)
machine.mem32[IO_MUX_GPIO19_REG] = (current_val & ~0b111) | 0
# Verify the change
new_val = machine.mem32[IO_MUX_GPIO19_REG]
print(f"Updated IO MUX register value for GPIO19: 0x{new_val:08X}")
Call the remap function
remap_gpio19()
Reconfigure GPIO19 as output
pin19 = machine.Pin(19, machine.Pin.OUT)
pin19.value(0) # Set GPIO19 to LOW
print("GPIO19 reconfigured as output and set to LOW.")
Initialize NeoPixel
NUM_LEDS = 24 # Number of LEDs in your NeoPixel ring
try:
np = neopixel.NeoPixel(pin19, NUM_LEDS)
print("NeoPixel object initialized successfully.")
except Exception as e:
print(f"Error initializing NeoPixel: {e}")
Set all LEDs to white
try:
print("Setting LEDs to white...")
for i in range(NUM_LEDS):
np[i] = (255, 255, 255) # White
print("Writing to NeoPixel...")
np.write()
print("NeoPixel write completed.")
except Exception as e:
print(f"Error writing to NeoPixel: {e}")
`
Expected behaviour
Ideally this would would set the leds of a neopixel to white.
Observed behaviour
No data or standard GPIO functionality is coming from GPIO 19.
Additional Information
I imagine this is very similar to #12479 . I've tried to remap the GPIO, I've gone into ESP idf and disabled usb/jtag I've tried mirroring the solution of #12479 with no luck. Other pins work just fine and I tested pin 19 Using C and it worked. So there's something happening here I'm not grasping and would greatly appreciate a solution as pin 19 is what is baked in on my pcb.
Code of Conduct
Yes, I agree