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Add example for ADC DMA. Update changelog.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| #![no_std] | ||
| #![no_main] | ||
|
|
||
| use cortex_m_semihosting::hprintln; | ||
| use panic_semihosting as _; | ||
|
|
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| use rtic::cyccnt::U32Ext; | ||
|
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| use stm32f4xx_hal::{ | ||
| adc::{ | ||
| config::{AdcConfig, Dma, SampleTime, Scan, Sequence}, | ||
| Adc, Temperature, | ||
| }, | ||
| dma::{config::DmaConfig, Channel0, PeripheralToMemory, Stream0, StreamsTuple, Transfer}, | ||
| prelude::*, | ||
| signature::{VtempCal110, VtempCal30}, | ||
| stm32, | ||
| stm32::{ADC1, DMA2}, | ||
| }; | ||
|
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| const POLLING_PERIOD: u32 = 168_000_000 / 2; | ||
|
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| type DMATransfer = | ||
| Transfer<Stream0<DMA2>, Channel0, Adc<ADC1>, PeripheralToMemory, &'static mut [u16; 2]>; | ||
|
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| #[rtic::app(device = stm32f4xx_hal::stm32, peripherals = true, monotonic = rtic::cyccnt::CYCCNT)] | ||
| const APP: () = { | ||
| struct Resources { | ||
| transfer: DMATransfer, | ||
| } | ||
|
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| #[init(schedule=[polling])] | ||
| fn init(cx: init::Context) -> init::LateResources { | ||
| let device: stm32::Peripherals = cx.device; | ||
|
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| let rcc = device.RCC.constrain(); | ||
| let _clocks = rcc | ||
| .cfgr | ||
| .use_hse(25.mhz()) | ||
| .require_pll48clk() | ||
| .sysclk(84.mhz()) | ||
| .hclk(84.mhz()) | ||
| .pclk1(42.mhz()) | ||
| .pclk2(84.mhz()) | ||
| .freeze(); | ||
|
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| let gpiob = device.GPIOB.split(); | ||
| let voltage = gpiob.pb1.into_analog(); | ||
|
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| let dma = StreamsTuple::new(device.DMA2); | ||
|
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| let config = DmaConfig::default() | ||
| .transfer_complete_interrupt(true) | ||
| .memory_increment(true) | ||
| .double_buffer(true); | ||
|
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| let adc_config = AdcConfig::default() | ||
| .dma(Dma::Continuous) | ||
| .scan(Scan::Enabled); | ||
|
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| let mut adc = Adc::adc1(device.ADC1, true, adc_config); | ||
| adc.configure_channel(&Temperature, Sequence::One, SampleTime::Cycles_480); | ||
| adc.configure_channel(&voltage, Sequence::Two, SampleTime::Cycles_480); | ||
| adc.enable_temperature_and_vref(); | ||
|
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| let first_buffer = cortex_m::singleton!(: [u16; 2] = [0; 2]).unwrap(); | ||
| let second_buffer = cortex_m::singleton!(: [u16; 2] = [0; 2]).unwrap(); | ||
| let transfer = Transfer::init(dma.0, adc, first_buffer, Some(second_buffer), config); | ||
|
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||
| let now = cx.start; | ||
| cx.schedule.polling(now + POLLING_PERIOD.cycles()).unwrap(); | ||
|
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| init::LateResources { transfer } | ||
| } | ||
|
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| #[task(resources = [transfer], schedule = [polling])] | ||
| fn polling(cx: polling::Context) { | ||
| let transfer: &mut DMATransfer = cx.resources.transfer; | ||
| transfer.start(|adc| { | ||
| adc.start_conversion(); | ||
| }); | ||
|
|
||
| cx.schedule | ||
| .polling(cx.scheduled + POLLING_PERIOD.cycles()) | ||
| .unwrap(); | ||
| } | ||
|
|
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| #[task(binds = DMA2_STREAM0, resources = [transfer])] | ||
| fn dma(cx: dma::Context) { | ||
| let transfer: &mut DMATransfer = cx.resources.transfer; | ||
|
|
||
| let result = unsafe { | ||
| transfer.next_transfer_with(|data, _| { | ||
| let raw_temp = data[0]; | ||
| let raw_volt = data[1]; | ||
| (data, (raw_temp, raw_volt)) | ||
| }) | ||
| } | ||
| .unwrap(); | ||
|
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| let cal30 = VtempCal30::get().read() as f32; | ||
| let cal110 = VtempCal110::get().read() as f32; | ||
|
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| let temperature = (110.0 - 30.0) * ((result.0 as f32) - cal30) / (cal110 - cal30) + 30.0; | ||
| let voltage = (result.1 as f32) / ((2_i32.pow(12) - 1) as f32) * 3.3; | ||
|
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| hprintln!("temperature: {}, voltage: {}", temperature, voltage).unwrap(); | ||
| } | ||
|
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| extern "C" { | ||
| fn EXTI0(); | ||
| } | ||
| }; |