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rp/pio: add load_program, use_program

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programs contain information we could pull from them directly and use to
validate other configuration of the state machine instead of asking the
user to pull them out and hand them to us bit by bit. unfortunately
programs do not specify how many in or out bits they use, so we can only
handle side-set and wrapping jumps like this. it's still something though.
This commit is contained in:
pennae
2023-05-05 19:49:34 +02:00
parent 5f7ef8bed0
commit 41ec4170a5
5 changed files with 74 additions and 115 deletions
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13
examples/rp/src/bin/ws2812-pio.rs
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@ -5,7 +5,6 @@
use defmt::*;
use embassy_executor::Spawner;
use embassy_rp::pio::{Common, FifoJoin, Instance, Pio, PioPin, ShiftDirection, StateMachine};
use embassy_rp::pio_instr_util;
use embassy_rp::relocate::RelocatedProgram;
use embassy_time::{Duration, Timer};
use smart_leds::RGB8;
@ -45,15 +44,11 @@ impl<'d, P: Instance, const S: usize> Ws2812<'d, P, S> {
let prg = a.assemble_with_wrap(wrap_source, wrap_target);
let relocated = RelocatedProgram::new(&prg);
pio.write_instr(relocated.origin() as usize, relocated.code());
pio_instr_util::exec_jmp(&mut sm, relocated.origin());
// Pin config
let out_pin = pio.make_pio_pin(pin);
sm.set_set_pins(&[&out_pin]);
sm.set_sideset_base_pin(&out_pin);
sm.set_sideset_count(1);
let relocated = RelocatedProgram::new(&prg);
sm.use_program(&pio.load_program(&relocated), &[&out_pin]);
// Clock config
// TODO CLOCK_FREQ should come from embassy_rp
@ -70,8 +65,6 @@ impl<'d, P: Instance, const S: usize> Ws2812<'d, P, S> {
}
sm.set_clkdiv((int << 8) | frac);
let pio::Wrap { source, target } = relocated.wrap();
sm.set_wrap(source, target);
// FIFO config
sm.set_autopull(true);