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even faster pio speed are possible

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This commit is contained in:
kbleeke
2023-03-19 16:43:46 +01:00
parent 0ff606dfc1
commit a6a2a035d5
3 changed files with 43 additions and 12 deletions
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22
examples/rpi-pico-w/src/pio.rs
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@ -2,7 +2,7 @@ use core::slice;
use cyw43::SpiBusCyw43;
use embassy_rp::dma::Channel;
use embassy_rp::gpio::{Pin, Pull};
use embassy_rp::gpio::{Drive, Pin, Pull, SlewRate};
use embassy_rp::pio::{PioStateMachine, ShiftDirection};
use embassy_rp::relocate::RelocatedProgram;
use embassy_rp::{pio_instr_util, Peripheral};
@ -43,10 +43,11 @@ where
"out pins, 1 side 0"
"jmp x-- lp side 1"
"set pindirs, 0 side 0"
// "nop side 1"
"nop side 1"
"lp2:"
"in pins, 1 side 0"
"jmp y-- lp2 side 1"
"in pins, 1 side 1"
"jmp y-- lp2 side 0"
".wrap"
);
@ -55,15 +56,22 @@ where
let mut pin_io = sm.make_pio_pin(dio);
pin_io.set_pull(Pull::Down);
pin_io.set_schmitt(true);
let pin_clk = sm.make_pio_pin(clk);
pin_io.set_input_sync_bypass(true);
let mut pin_clk = sm.make_pio_pin(clk);
pin_clk.set_drive_strength(Drive::_12mA);
pin_clk.set_slew_rate(SlewRate::Fast);
sm.write_instr(relocated.origin() as usize, relocated.code());
// 32 Mhz
sm.set_clkdiv(0x03E8);
// 16 Mhz
sm.set_clkdiv(0x07d0);
// sm.set_clkdiv(0x07d0);
// 8Mhz
sm.set_clkdiv(0x0a_00);
// sm.set_clkdiv(0x0a_00);
// 1Mhz
// sm.set_clkdiv(0x7d_00);