Raspiberry Pi RP2040 LCD clock signals

Question

I'm using Micro python to try and generate an RGB signal for a TFT screen such as the: Screen

The timings i need the follow are:

CLKIN: 3.33Mhz

Horizontal is 800 clock cycles up and 1 clock cycle down

Vertical is 480 Horizontal Clock cycles up and

Ive already got this code that spits out the clock but i cant chnage the square function or add a second state machine, how would i go about bit bashing the pins at the required times.

from machine import Pin
from rp2 import PIO, StateMachine, asm_pio
import time

@asm_pio(set_init=PIO.OUT_LOW)
def square():
    wrap_target()
    set(pins, 1)
    set(pins, 0)
    wrap()

    
sm = rp2.StateMachine(0, square, freq=33300000, set_base=Pin(2))

sm.active(1)

Answer 1

Your frequency is 3.33mHz, but each cycle uses 2 cpu cycles so each rising edge is only at 1.665mHz.