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#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
use core::mem;
use defmt::{info, unwrap};
use embassy_executor::Spawner;
use embassy_nrf::qspi::Frequency;
use embassy_nrf::{bind_interrupts, peripherals, qspi};
use embassy_time::{Duration, Timer};
use {defmt_rtt as _, panic_probe as _};
// Workaround for alignment requirements.
// Nicer API will probably come in the future.
#[repr(C, align(4))]
struct AlignedBuf([u8; 64]);
bind_interrupts!(struct Irqs {
QSPI => qspi::InterruptHandler<peripherals::QSPI>;
});
#[embassy_executor::main]
async fn main(_p: Spawner) {
let mut p = embassy_nrf::init(Default::default());
loop {
// Config for the MX25R64 present in the nRF52840 DK
let mut config = qspi::Config::default();
config.capacity = 8 * 1024 * 1024; // 8 MB
config.frequency = Frequency::M32;
config.read_opcode = qspi::ReadOpcode::READ4IO;
config.write_opcode = qspi::WriteOpcode::PP4IO;
config.write_page_size = qspi::WritePageSize::_256BYTES;
config.deep_power_down = Some(qspi::DeepPowerDownConfig {
enter_time: 3, // tDP = 30uS
exit_time: 3, // tRDP = 35uS
});
let mut q = qspi::Qspi::new(
&mut p.QSPI,
Irqs,
&mut p.P0_19,
&mut p.P0_17,
&mut p.P0_20,
&mut p.P0_21,
&mut p.P0_22,
&mut p.P0_23,
config,
);
let mut id = [1; 3];
unwrap!(q.custom_instruction(0x9F, &[], &mut id).await);
info!("id: {}", id);
// Read status register
let mut status = [4; 1];
unwrap!(q.custom_instruction(0x05, &[], &mut status).await);
info!("status: {:?}", status[0]);
if status[0] & 0x40 == 0 {
status[0] |= 0x40;
unwrap!(q.custom_instruction(0x01, &status, &mut []).await);
info!("enabled quad in status");
}
let mut buf = AlignedBuf([0u8; 64]);
info!("reading...");
unwrap!(q.read(0, &mut buf.0).await);
info!("read: {=[u8]:x}", buf.0);
// Drop the QSPI instance. This disables the peripehral and deconfigures the pins.
// This clears the borrow on the singletons, so they can now be used again.
mem::drop(q);
// Sleep for 1 second. The executor ensures the core sleeps with a WFE when it has nothing to do.
// During this sleep, the nRF chip should only use ~3uA
Timer::after(Duration::from_secs(1)).await;
}
}
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