diff --git a/README.md b/README.md index a4792e1..4595c8d 100644 --- a/README.md +++ b/README.md @@ -3,13 +3,12 @@ ### The DShot Protocol The DSHOT protocol consists of transmitting 16-bit packets to the ESCs: 11-bit throttle value, 1-bit to request telemetry and a 4-bit checksum. There are three major protocol speeds: DSHOT150, DSHOT300 and DSHOT600. -#### DShot -Timing: - DSHOT | Bitrate | TH1 | TH0 | Bit Time µs | Frame Time µs ---------:|---------:|-------:|-------:|------------:|-------------: -**150** | 150kbit/s| 5.00 | 2.50 | 6.67 | 106.72 -**300** | 300kbit/s| 2.50 | 1.25 | 3.33 | 53.28 -**600** | 600kbit/s| 1.25 | 0.625 | 1.67 | 26.72 -**1200** |1200kbit/s| 0.625 | 0.313 | 0.83 | 13.28 +| DSHOT | Bitrate | TH1 | TH0 | Bit Time µs | Frame Time µs | +|-------|----------|-------|--------|-------------|-----------------| +| 150 | 150kbit/s | 5.00 | 2.50 | 6.67 | 106.72 | +| 300 | 300kbit/s | 2.50 | 1.25 | 3.33 | 53.28 | +| 600 | 600kbit/s | 1.25 | 0.625 | 1.67 | 26.72 | +| 1200 | 1200kbit/s| 0.625 | 0.313 | 0.83 | 13.28 | #### Calculating the CRC The checksum is calculated over the throttle value and the telemetry bit, so the “first” 12 bits our value in the following example: @@ -24,9 +23,18 @@ The calculation of the checksum is basically the same, just before the last step crc = (~(value ^ (value >> 4) ^ (value >> 8))) & 0x0F; ----- +### Using RMT on ESP32 +The RMT (Remote Control) is a peripheral designed to generate accurate and stable signals to control external devices such as LEDs, motors, and other peripherals. It is well suited for generating the DShot signals in a high-performance and accurate way on the ESP32 platform. -*References:* -- [DSHOT - the missing Handbook](https://brushlesswhoop.com/dshot-and-bidirectional-dshot/) +#### Advantages of using RMT +- Generates accurate signals +- Supports programmable timing +- Configurable number of channels +#### DShot RMT Library for ESP32 +The DShot RMT Library for ESP32 provides a convenient way of generating DShot signals using the RMT peripheral on the ESP32 platform. The library supports all three major DShot speeds: DSHOT150, DSHOT300, and DSHOT600. + +#### References +- [DSHOT - the missing Handbook](https://brushlesswhoop.com/dshot-and-bidirectional-dshot/) - [DSHOT in the Dark](https://dmrlawson.co.uk/index.php/2017/12/04/dshot-in-the-dark/) +- [ESP32 Technical Reference Manual](https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf)