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//! This example shows how to use SPI (Serial Peripheral Interface) in the RP235x chip.
//!
//! Example for resistive touch sensor in Waveshare Pico-ResTouch
#![no_std]
#![no_main]
use defmt::*;
use embassy_executor::Spawner;
use embassy_rp::spi::Spi;
use embassy_rp::{gpio, spi};
use gpio::{Level, Output};
use {defmt_rtt as _, panic_probe as _};
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let p = embassy_rp::init(Default::default());
info!("Hello World!");
// Example for resistive touch sensor in Waveshare Pico-ResTouch
let miso = p.PIN_12;
let mosi = p.PIN_11;
let clk = p.PIN_10;
let touch_cs = p.PIN_16;
// create SPI
let mut config = spi::Config::default();
config.frequency = 2_000_000;
let mut spi = Spi::new_blocking(p.SPI1, clk, mosi, miso, config);
// Configure CS
let mut cs = Output::new(touch_cs, Level::Low);
loop {
cs.set_low();
let mut buf = [0x90, 0x00, 0x00, 0xd0, 0x00, 0x00];
spi.blocking_transfer_in_place(&mut buf).unwrap();
cs.set_high();
let x = (buf[1] as u32) << 5 | (buf[2] as u32) >> 3;
let y = (buf[4] as u32) << 5 | (buf[5] as u32) >> 3;
info!("touch: {=u32} {=u32}", x, y);
}
}
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