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| Original file line number | Diff line number | Diff line change |
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| //! Example of communicating with a [DS3231] Real-Time Clock. | ||
| //! | ||
| //! [DS3231]: https://www.analog.com/media/en/technical-documentation/data-sheets/DS3231.pdf | ||
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| #![no_main] | ||
| #![no_std] | ||
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| // Required for panic handler | ||
| extern crate flipperzero_rt; | ||
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| // Required for allocator | ||
| #[cfg(feature = "alloc")] | ||
| extern crate flipperzero_alloc; | ||
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| use flipperzero::{error, furi::time::Duration, gpio::i2c, println}; | ||
| use flipperzero_rt::{entry, manifest}; | ||
| use ufmt::derive::uDebug; | ||
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| manifest!(name = "I2C DS3231 Example"); | ||
| entry!(main); | ||
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| #[derive(Debug, uDebug)] | ||
| enum Hour { | ||
| F12 { hour: u8, pm: bool }, | ||
| F24(u8), | ||
| } | ||
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| #[derive(Debug, uDebug)] | ||
| struct RtcTime { | ||
| year: u8, | ||
| month: u8, | ||
| date: u8, | ||
| day: u8, | ||
| hour: Hour, | ||
| minutes: u8, | ||
| seconds: u8, | ||
| } | ||
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| impl RtcTime { | ||
| fn parse(data: [u8; 7]) -> Self { | ||
| let unbcd = |b: u8| 10 * (b >> 4) + (b & 0x0F); | ||
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| const FORMAT_12HR: u8 = 0b0100_0000; | ||
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| Self { | ||
| year: unbcd(data[6]), | ||
| month: unbcd(data[5] & 0x1F), | ||
| date: unbcd(data[4] & 0x3F), | ||
| day: data[3] & 0x07, | ||
| hour: if data[2] & FORMAT_12HR != 0 { | ||
| Hour::F12 { | ||
| hour: unbcd(data[2] & 0x1F), | ||
| pm: data[2] & 0b0010_0000 != 0, | ||
| } | ||
| } else { | ||
| Hour::F24(unbcd(data[2] & 0x3F)) | ||
| }, | ||
| minutes: unbcd(data[1] & 0x7F), | ||
| seconds: unbcd(data[0] & 0x7F), | ||
| } | ||
| } | ||
| } | ||
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| fn main(_args: *mut u8) -> i32 { | ||
| let mut bus = i2c::Bus::EXTERNAL.acquire(); | ||
| let rtc = i2c::DeviceAddress::new(0x68); | ||
| let timeout = Duration::from_millis(50); | ||
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| if bus.is_device_ready(rtc, timeout) { | ||
| let mut data = [0; 7]; | ||
| if bus.read_exact(rtc, 0x00, &mut data, timeout).is_ok() { | ||
| println!("Time: {:?}", RtcTime::parse(data)); | ||
| } else { | ||
| error!("Could not read from DS3231"); | ||
| } | ||
| } else { | ||
| error!("DS3231 is not connected and ready"); | ||
| } | ||
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| 0 | ||
| } |
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