85 lines
2.5 KiB
Rust
85 lines
2.5 KiB
Rust
#![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::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_secs(1).await;
|
|
}
|
|
}
|