mirror of
https://github.com/esp-rs/esp-hal.git
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be184a552d
* CS impl * use CS Mutex in C3 examples * use CS Mutex in S2 examples * Update esp32 example * run fmt * Update S3 examples * Remove uses of unsafe where no longer required * use esp_backtrace in examples * fix import & fmt once more * Bump MSRV to 1.60.0 Co-authored-by: Jesse Braham <jesse@beta7.io>
79 lines
1.8 KiB
Rust
79 lines
1.8 KiB
Rust
//! SPI loopback test
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//!
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//! Folowing pins are used:
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//! SCLK GPIO19
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//! MISO GPIO25
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//! MOSI GPIO23
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//! CS GPIO22
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//!
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//! Depending on your target and the board you are using you have to change the
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//! pins.
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//!
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//! This example transfers data via SPI.
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//! Connect MISO and MOSI pins to see the outgoing data is read as incoming
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//! data.
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#![no_std]
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#![no_main]
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use core::fmt::Write;
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use esp32_hal::{
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clock::ClockControl,
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gpio::IO,
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pac::Peripherals,
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prelude::*,
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spi::{Spi, SpiMode},
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timer::TimerGroup,
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Delay,
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Rtc,
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Serial,
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};
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use esp_backtrace as _;
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use xtensa_lx_rt::entry;
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#[entry]
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fn main() -> ! {
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let peripherals = Peripherals::take().unwrap();
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let mut system = peripherals.DPORT.split();
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let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
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// Disable the watchdog timers. For the ESP32-C3, this includes the Super WDT,
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// the RTC WDT, and the TIMG WDTs.
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let mut rtc = Rtc::new(peripherals.RTC_CNTL);
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let timer_group0 = TimerGroup::new(peripherals.TIMG0, &clocks);
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let mut wdt = timer_group0.wdt;
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let mut serial0 = Serial::new(peripherals.UART0);
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wdt.disable();
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rtc.rwdt.disable();
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let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
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let sclk = io.pins.gpio19;
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let miso = io.pins.gpio25;
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let mosi = io.pins.gpio23;
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let cs = io.pins.gpio22;
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let mut spi = Spi::new(
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peripherals.SPI2,
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sclk,
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mosi,
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miso,
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cs,
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100u32.kHz(),
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SpiMode::Mode0,
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&mut system.peripheral_clock_control,
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&clocks,
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);
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let mut delay = Delay::new(&clocks);
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loop {
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let mut data = [0xde, 0xca, 0xfb, 0xad];
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spi.transfer(&mut data).unwrap();
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writeln!(serial0, "{:x?}", data).ok();
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delay.delay_ms(250u32);
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}
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}
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