1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759
// Copyright (c) 2020 Karl Thorén <karl.h.thoren@gmail.com> // Copyright (c) 2019 cs2dsb // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. //! # adafruit-7segment backpack Hal //! //! Additional features on top of the [`ht16k33` crate](https://crates.io/crates/ht16k33) to drive an [Adafruit 7-segment LED Alphanumeric Backpack](https://learn.adafruit.com/adafruit-led-backpack/0-dot-56-seven-segment-backpack) using traits from `embedded-hal`. //! Derived from the [`adafruit-alphanum4` crate](https://crates.io/crates/adafruit-alphanum4) and modified for the 7-segment backpacks. //! //! ## Features //! * Sending a `u8` to one of the 4 segments. Limited to 0x00 to 0x0F. //! * Sending an `AsciiChar` to one of the 4 segments. Limited to ascii hex chars and - sign. //! * Setting or unsetting the dot associated with one of the 4 segments. //! * Setting or unsetting the colon. //! * Formatting a `f32` to 1 to 4 segments //! //! # Usage //! //! ## Embedded platforms //! ### Example on a STM32F4-Discovery board //! For examples on other platforms see the [`ht16k33` crate](https://crates.io/crates/ht16k33). //! //! `Cargo.toml` dependencies example: //! ```toml //! [dependencies] //! htk16k33 = { version = "0.4.0", default-features = false } //! adafruit-7segment = { version = "0.1", default-features = false } //! embedded-hal = "0.2.3" //! cortex-m = "0.6.2" //! cortex-m-rt = "0.6.12" //! panic-halt = "0.2.0" //! //! [dependencies.stm32f4xx-hal] //! version = "0.8" //! features = ["rt", "stm32f407"] //!``` //! Test code: //!```!ignore //! #![no_main] //! #![no_std] //! //! use panic_halt as _; //! //! use cortex_m; //! use cortex_m_rt::entry; //! use stm32f4xx_hal as hal; //! //! use crate::hal::{i2c::I2c, prelude::*, stm32}; //! use ht16k33::{HT16K33, Dimming, Display}; //! use adafruit_7segment::{SevenSegment, Index}; //! pub use ascii::{ToAsciiChar, AsciiChar}; //! //! #[entry] //! fn main() -> ! { //! if let (Some(dp), Some(cp)) = ( //! stm32::Peripherals::take(), //! cortex_m::peripheral::Peripherals::take(), //! ) { //! // Set up the system clock. We want to run at 48MHz for this one. //! let rcc = dp.RCC.constrain(); //! let clocks = rcc.cfgr.sysclk(48.mhz()).freeze(); //! //! const DISP_I2C_ADDR: u8 = 112; //! //! // Set up I2C - SCL is PB8 and SDA is PB7; they are set to Alternate Function 4 //! // as per the STM32F407 datasheet. //! let gpiob = dp.GPIOB.split(); //! let scl = gpiob.pb8.into_alternate_af4().set_open_drain(); //! let sda = gpiob.pb7.into_alternate_af4().set_open_drain(); //! let i2c = I2c::i2c1(dp.I2C1, (scl, sda), 400.khz(), clocks); //! //! let mut ht16k33 = HT16K33::new(i2c, DISP_I2C_ADDR); //! ht16k33.initialize().expect("Failed to initialize ht16k33"); //! ht16k33.set_display(Display::ON).expect("Could not turn on the display!"); //! ht16k33.set_dimming(Dimming::BRIGHTNESS_MIN).expect("Could not set dimming!"); //! //! // Sending individual digits //! ht16k33.update_buffer_with_digit(Index::One, 1); //! ht16k33.update_buffer_with_digit(Index::Two, 2); //! ht16k33.update_buffer_with_digit(Index::Three, 3); //! ht16k33.update_buffer_with_digit(Index::Four, 4); //! //! // Sending ascii //! ht16k33.update_buffer_with_char(Index::One, AsciiChar::new('A')); //! ht16k33.update_buffer_with_char(Index::Two, AsciiChar::new('B')); //! //! // Setting the decimal point //! ht16k33.update_buffer_with_dot(Index::Two, true); //! //! // Formatting a float using the whole display //! ht16k33.update_buffer_with_float(Index::One, -3.14, 2, 10).unwrap(); //! //! // Putting a character in front of a float //! ht16k33.update_buffer_with_char(Index::One, AsciiChar::new('b')); //! // Display will read "b-3.1" //! ht16k33.update_buffer_with_float(Index::Two, -3.14, 2, 10).unwrap(); //! //! // This will panic because there aren't enough digits to display this number //! ht16k33.update_buffer_with_float(Index::One, 12345., 0, 10).expect("Oops"); //! //! // Note: none of the above methods actually commit the buffer to the display, //! // call write_display_buffer to actually send it to the display //! ht16k33.write_display_buffer().unwrap() //! } //! loop {} //! } //!``` //! ## All platforms, using I2C simulation //!``` //! use ht16k33::i2c_mock::I2cMock; //! use ht16k33::{HT16K33, Dimming, Display}; //! use adafruit_7segment::{SevenSegment, Index}; //! //! // The I2C device address. //! const DISP_I2C_ADDR: u8 = 112; //! //! // Create a mock I2C device. //! let mut i2c = I2cMock::new(); //! //! let mut ht16k33 = HT16K33::new(i2c, DISP_I2C_ADDR); //! ht16k33.initialize().expect("Failed to initialize ht16k33"); //! ht16k33.set_display(Display::ON).expect("Could not turn on the display!"); //! ht16k33.set_dimming(Dimming::BRIGHTNESS_MIN).expect("Could not set dimming!"); //! //! // Sending individual digits //! ht16k33.update_buffer_with_digit(Index::One, 1); //! ht16k33.update_buffer_with_digit(Index::Two, 2); //! ht16k33.update_buffer_with_digit(Index::Three, 3); //! ht16k33.update_buffer_with_digit(Index::Four, 4); //! //! // Note: none of the above methods actually commit the buffer to the display, //! // call write_display_buffer to actually send it to the display //! ht16k33.write_display_buffer().unwrap() //!``` //! ## Performance warning //! //! Due to the api of the ht16k33 crate the display buffer is not directly accessible so each LED that makes up the character is updated sequentially. The way the hardware on this backpack is set up allows a character to be updated by setting a single 16-bit value in the buffer. Iterating over each bit of the 16 every update is clearly not optimal but it's sufficiently fast for my current usage. If the ht16k33 crate is updated to grant mut access to the buffer this can be improved. #![warn(missing_docs)] #![warn(missing_doc_code_examples)] #![doc(html_root_url = "https://docs.rs/adafruit-7segment/0.1.0")] #![cfg_attr(not(feature = "std"), no_std)] mod fonts; use fonts::*; pub use ascii::{AsciiChar, ToAsciiChar}; use embedded_hal::blocking::i2c::{Write, WriteRead}; use ht16k33::{DisplayData, DisplayDataAddress, LedLocation, COMMONS_SIZE, HT16K33}; /// Possible errors returned by this crate. #[derive(Debug)] pub enum Error { /// Error indicating there aren't enough digits to display the given float value. InsufficientDigits, /// Error indicating that the input cannot be displayed. NotValidChar, } /// Trait enabling using the Adafruit 7-segment LED numeric Backpack. pub trait SevenSegment<E> { /// Update the buffer with a digit value (0 to F) at the specified index. fn update_buffer_with_digit(&mut self, index: Index, value: u8); /// Update the buffer to turn the . on or off at the specified index. fn update_buffer_with_dot(&mut self, index: Index, dot_on: bool); /// Update the buffer to turn the : on or off. fn update_buffer_with_colon(&mut self, colon_on: bool); /// Update the buffer with an ascii character at the specified index. fn update_buffer_with_char(&mut self, index: Index, value: AsciiChar) -> Result<(), Error>; /// Update the buffer with a formatted float not starting before the specified index. fn update_buffer_with_float( &mut self, index: Index, value: f32, fractional_digits: u8, base: u8, ) -> Result<(), Error>; } /// The index of a segment #[derive(Clone, Copy, PartialEq, PartialOrd)] pub enum Index { /// First digit One, /// Second digit Two, /// Third digit Three, /// Fourth digit Four, } impl From<Index> for u8 { fn from(i: Index) -> u8 { match i { Index::One => 0, Index::Two => 1, Index::Three => 2, Index::Four => 3, } } } impl From<u8> for Index { fn from(v: u8) -> Index { match v { 0 => Index::One, 1 => Index::Two, 2 => Index::Three, 3 => Index::Four, _ => panic!("Invalid index > 3"), } } } const MINUS_SIGN: u8 = 0x40; const DOT_BIT: u8 = 7; const COLON_BIT: u8 = 1; fn set_bit<I2C, E>(display: &mut HT16K33<I2C>, index: u8, bit: u8, on: bool) where I2C: Write<Error = E> + WriteRead<Error = E>, { debug_assert!((bit as usize) < (COMMONS_SIZE * 2)); let index = index * 2; let row = DisplayDataAddress::from_bits_truncate(if bit < 8 { index } else { index + 1 }); let common = DisplayData::from_bits_truncate(1 << (bit % 8)); display.update_display_buffer(LedLocation { row, common }, on); } fn update_bits<I2C, E>(display: &mut HT16K33<I2C>, index: Index, bits: u8) where I2C: Write<Error = E> + WriteRead<Error = E>, { let pos: u8; if index > Index::Two { // Move one step to compensate for colon at pos 2. pos = u8::from(index) + 1u8; } else { pos = index.into(); } for i in 0..8 { let on = ((bits >> i) & 1) == 1; set_bit(display, pos, i, on); } } impl<I2C, E> SevenSegment<E> for HT16K33<I2C> where I2C: Write<Error = E> + WriteRead<Error = E>, { /// Update the buffer with a hex digit value (0x00 to 0x0F) at the specified index /// # Arguments /// /// * `index` - Digit index. /// * `value` - Value 0x00 to 0x0F. /// /// # Examples /// /// ``` /// use ht16k33::i2c_mock::I2cMock; /// use ht16k33::HT16K33; /// use adafruit_7segment::{SevenSegment, Index}; /// /// // Create an I2C device. /// let mut i2c = I2cMock::new(); /// /// // The I2C device address. /// const DISP_I2C_ADDR: u8 = 112; /// /// let mut ht16k33 = HT16K33::new(i2c, DISP_I2C_ADDR); /// /// // Set first digit to 9. /// ht16k33.update_buffer_with_digit(Index::One, 9); /// ``` fn update_buffer_with_digit(&mut self, index: Index, value: u8) { let value = value as usize; assert!(value < HEX_NUMBER_FONT_TABLE.len()); let bits = HEX_NUMBER_FONT_TABLE[value]; update_bits(self, index, bits); } /// Update the buffer to turn the . on or off at the specified index /// # Arguments /// /// * `index` - Digit index. /// * `dot_on` - Enable or disable the dot. /// /// # Examples /// /// ``` /// use ht16k33::i2c_mock::I2cMock; /// use ht16k33::HT16K33; /// use adafruit_7segment::{SevenSegment, Index}; /// /// // Create an I2C device. /// let mut i2c = I2cMock::new(); /// /// // The I2C device address. /// const DISP_I2C_ADDR: u8 = 112; /// /// let mut ht16k33 = HT16K33::new(i2c, DISP_I2C_ADDR); /// /// // Enable dot for first digit. /// ht16k33.update_buffer_with_dot(Index::One, true); /// ``` fn update_buffer_with_dot(&mut self, index: Index, dot_on: bool) { let pos: u8; if index > Index::Two { // Move one step to compensate for colon at pos 2. pos = u8::from(index) + 1u8; } else { pos = index.into(); } set_bit(self, pos, DOT_BIT, dot_on); } /// Update the buffer to turn the : on or off. /// # Arguments /// /// * `colon_on` - Enable or disable the colon. /// /// # Examples /// /// ``` /// use ht16k33::i2c_mock::I2cMock; /// use ht16k33::HT16K33; /// use adafruit_7segment::{SevenSegment, Index}; /// /// // Create an I2C device. /// let mut i2c = I2cMock::new(); /// /// // The I2C device address. /// const DISP_I2C_ADDR: u8 = 112; /// /// let mut ht16k33 = HT16K33::new(i2c, DISP_I2C_ADDR); /// /// // Enable the colon. /// ht16k33.update_buffer_with_colon(true); /// ``` fn update_buffer_with_colon(&mut self, colon_on: bool) { // The colon is at address 2. set_bit(self, 2u8, COLON_BIT, colon_on); } /// Update the buffer with an ascii character at the specified index. /// # Arguments /// /// * `index` - Digit index. /// * `value` - Ascii character. /// /// # Examples /// /// ``` /// use ht16k33::i2c_mock::I2cMock; /// use ht16k33::HT16K33; /// use adafruit_7segment::{SevenSegment, Index, AsciiChar}; /// /// // Create an I2C device. /// let mut i2c = I2cMock::new(); /// /// // The I2C device address. /// const DISP_I2C_ADDR: u8 = 112; /// /// let mut ht16k33 = HT16K33::new(i2c, DISP_I2C_ADDR); /// /// // Set first digit to 'c'. /// ht16k33.update_buffer_with_char(Index::One, AsciiChar::new('c')).expect("Failed to encode char to buffer!"); /// ``` fn update_buffer_with_char(&mut self, index: Index, value: AsciiChar) -> Result<(), Error> { if value.is_ascii_hexdigit() { let val: u8; if value.is_ascii_digit() { // 0-9 converted to hex value val = value.as_byte() - b'0'; } else { // a-f or A-F converted to hex value val = 0x0A + (value.to_ascii_uppercase().as_byte() - b'A'); } let val = val as usize; assert!(val < HEX_NUMBER_FONT_TABLE.len()); let bits = HEX_NUMBER_FONT_TABLE[val]; update_bits(self, index, bits); } else if value == '-' { update_bits(self, index, MINUS_SIGN); } else { return Err(Error::NotValidChar); } Ok(()) } /// Update the buffer with a formatted float not starting before the specified index /// The logic for this is copied mostly from from the adafruit library. Only difference is this allows the start index to be > 0 /// /// # Arguments /// /// * `index` - Digit index. /// * `value` - float value. /// * `fractional_digits` - Number of fractional digits. /// * `base` - Base to use. /// /// # Examples /// /// ``` /// use ht16k33::i2c_mock::I2cMock; /// use ht16k33::HT16K33; /// use adafruit_7segment::{SevenSegment, Index}; /// /// // Create an I2C device. /// let mut i2c = I2cMock::new(); /// /// // The I2C device address. /// const DISP_I2C_ADDR: u8 = 112; /// /// let mut ht16k33 = HT16K33::new(i2c, DISP_I2C_ADDR); /// /// // Write 9.9 from pos 2 /// ht16k33.update_buffer_with_float(Index::Two, 9.9, 1, 10); /// ``` fn update_buffer_with_float( &mut self, index: Index, mut value: f32, mut fractional_digits: u8, base: u8, ) -> Result<(), Error> { let index = u8::from(index); // Available digits on display let mut numeric_digits = 4 - index; let is_negative = if value < 0. { // The sign will take up one digit numeric_digits -= 1; // Flip the sign to do the rest of the formatting value *= -1.; true } else { false }; let base = base as u32; let basef = base as f32; // Work out the multiplier needed to get all fraction digits into an integer let mut to_int_factor = base.pow(fractional_digits as u32) as f32; // Get an integer containing digits to be displayed let mut display_number = ((value * to_int_factor) + 0.5) as u32; // Calculate the upper bound given the number of digits available let too_big = base.pow(numeric_digits as u32); // If the number is too large, reduce fractional digits while display_number >= too_big { fractional_digits -= 1; to_int_factor /= basef; display_number = ((value * to_int_factor) + 0.5) as u32; } // Did we lose the decimal? if to_int_factor < 1. { return Err(Error::InsufficientDigits); } // Digit we're working on, less the start position let mut display_pos = (3 - index) as i8; if display_number == 0 { // Write out the 0 self.update_buffer_with_digit((index + (display_pos as u8)).into(), 0); // Move the current pos along display_pos -= 1; } else { let mut i = 0; while display_number != 0 || i <= fractional_digits { let digit_index: Index = (index + (display_pos as u8)).into(); // Write out the current digit self.update_buffer_with_digit(digit_index, (display_number % base) as u8); // Add the decimal if necessary if fractional_digits != 0 && i == fractional_digits { self.update_buffer_with_dot(digit_index, true); } // Move the current pos along display_pos -= 1; // Move the number along display_number /= base; i += 1; } } if is_negative { // Add the minus sign update_bits(self, (index + (display_pos as u8)).into(), MINUS_SIGN); // Move the current pos along display_pos -= 1; } // Clear any remaining segments while display_pos >= 0 { update_bits(self, (index + (display_pos as u8)).into(), 0); // Move the current pos along display_pos -= 1; } Ok(()) } } #[cfg(test)] mod tests { extern crate std; use embedded_hal_mock as hal; use self::hal::i2c::Mock as I2cMock; use super::*; const ADDRESS: u8 = 0; #[test] fn update_buffer_with_dot() { let expectations = []; let mut i2c = I2cMock::new(&expectations); let mut ht16k33 = HT16K33::new(i2c, ADDRESS); ht16k33.update_buffer_with_dot(Index::One, true); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b1000_0000); assert_eq!(ht16k33.display_buffer()[1].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[2].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[3].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[4].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[5].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[6].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[7].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[8].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[9].bits(), 0b0000_0000); ht16k33.update_buffer_with_dot(Index::Two, true); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b1000_0000); assert_eq!(ht16k33.display_buffer()[1].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[2].bits(), 0b1000_0000); assert_eq!(ht16k33.display_buffer()[3].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[4].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[5].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[6].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[7].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[8].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[9].bits(), 0b0000_0000); ht16k33.update_buffer_with_dot(Index::Three, true); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b1000_0000); assert_eq!(ht16k33.display_buffer()[1].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[2].bits(), 0b1000_0000); assert_eq!(ht16k33.display_buffer()[3].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[4].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[5].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[6].bits(), 0b1000_0000); assert_eq!(ht16k33.display_buffer()[7].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[8].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[9].bits(), 0b0000_0000); ht16k33.update_buffer_with_dot(Index::Four, true); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b1000_0000); assert_eq!(ht16k33.display_buffer()[1].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[2].bits(), 0b1000_0000); assert_eq!(ht16k33.display_buffer()[3].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[4].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[5].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[6].bits(), 0b1000_0000); assert_eq!(ht16k33.display_buffer()[7].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[8].bits(), 0b1000_0000); assert_eq!(ht16k33.display_buffer()[9].bits(), 0b0000_0000); i2c = ht16k33.destroy(); i2c.done(); } #[test] fn update_buffer_with_colon() { let expectations = []; let mut i2c = I2cMock::new(&expectations); let mut ht16k33 = HT16K33::new(i2c, ADDRESS); // Enable colon ht16k33.update_buffer_with_colon(true); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[1].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[2].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[3].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[4].bits(), 0b0000_0010); assert_eq!(ht16k33.display_buffer()[5].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[6].bits(), 0b0000_0000); i2c = ht16k33.destroy(); i2c.done(); } #[test] fn update_buffer_with_digit() { let expectations = []; let mut i2c = I2cMock::new(&expectations); let mut ht16k33 = HT16K33::new(i2c, ADDRESS); // Write an A ht16k33.update_buffer_with_digit(Index::One, 0x0A); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0111_0111); // Write an B ht16k33.update_buffer_with_digit(Index::One, 0x0B); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0111_1100); // Write an 0 ht16k33.update_buffer_with_digit(Index::One, 0x00); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0011_1111); // Write an 9 ht16k33.update_buffer_with_digit(Index::One, 0x09); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0110_1111); i2c = ht16k33.destroy(); i2c.done(); } #[test] fn update_buffer_with_char() { let expectations = []; let mut i2c = I2cMock::new(&expectations); let mut ht16k33 = HT16K33::new(i2c, ADDRESS); // Write an A assert!(ht16k33 .update_buffer_with_char(Index::One, AsciiChar::new('A')) .is_ok()); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0111_0111); // Write an a assert!(ht16k33 .update_buffer_with_char(Index::One, AsciiChar::new('a')) .is_ok()); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0111_0111); // Write an B assert!(ht16k33 .update_buffer_with_char(Index::One, AsciiChar::new('B')) .is_ok()); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0111_1100); // Write an b assert!(ht16k33 .update_buffer_with_char(Index::One, AsciiChar::new('b')) .is_ok()); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0111_1100); // Write an 0 assert!(ht16k33 .update_buffer_with_char(Index::One, AsciiChar::new('0')) .is_ok()); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0011_1111); // Write an 9 assert!(ht16k33 .update_buffer_with_char(Index::One, AsciiChar::new('9')) .is_ok()); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0110_1111); // Write an - assert!(ht16k33 .update_buffer_with_char(Index::One, AsciiChar::new('-')) .is_ok()); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0100_0000); i2c = ht16k33.destroy(); i2c.done(); } #[test] fn update_buffer_with_float() { let expectations = []; let mut i2c = I2cMock::new(&expectations); let mut ht16k33 = HT16K33::new(i2c, ADDRESS); assert!(ht16k33 .update_buffer_with_float(Index::One, 99.9, 2, 10) .is_ok()); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0110_1111); assert_eq!(ht16k33.display_buffer()[1].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[2].bits(), 0b1110_1111); assert_eq!(ht16k33.display_buffer()[3].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[4].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[5].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[6].bits(), 0b0110_1111); assert_eq!(ht16k33.display_buffer()[7].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[8].bits(), 0b0011_1111); assert_eq!(ht16k33.display_buffer()[9].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[10].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[11].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[12].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[13].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[14].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[15].bits(), 0b0000_0000); assert!(ht16k33 .update_buffer_with_float(Index::One, -99.9, 2, 10) .is_ok()); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0100_0000); assert_eq!(ht16k33.display_buffer()[1].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[2].bits(), 0b0110_1111); assert_eq!(ht16k33.display_buffer()[3].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[4].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[5].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[6].bits(), 0b1110_1111); assert_eq!(ht16k33.display_buffer()[7].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[8].bits(), 0b0110_1111); assert_eq!(ht16k33.display_buffer()[9].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[10].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[11].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[12].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[13].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[14].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[15].bits(), 0b0000_0000); ht16k33.clear_display_buffer(); assert!(ht16k33 .update_buffer_with_float(Index::Two, 9.9, 1, 10) .is_ok()); assert_eq!(ht16k33.display_buffer()[0].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[1].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[2].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[3].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[4].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[5].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[6].bits(), 0b1110_1111); assert_eq!(ht16k33.display_buffer()[7].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[8].bits(), 0b0110_1111); assert_eq!(ht16k33.display_buffer()[9].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[10].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[11].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[12].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[13].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[14].bits(), 0b0000_0000); assert_eq!(ht16k33.display_buffer()[15].bits(), 0b0000_0000); i2c = ht16k33.destroy(); i2c.done(); } }