Flipper Zero - SHTC3 Clock Stretching and wait.

Опубликовано: 24 Июнь 2023
на канале: Derek Jamison
614
13

In this the 3rd video on the SHTC3 Temp/Humidity sensor. We look at the impact of sending commands to soon after a wakeup command to the I2C sensor connected to the Flipper Zero. We also look at clock stretching feature of the SHTC3 Temp/Humidity sensor, which allows us to read data immediately after requesting it. We also look at the frui_hal_i2c methods and show that they can return true (success) even if the device doesn't ACK the request.

Link to video on SHTC3 sensor:
   • Flipper Zero- Identify unknown I2C de...  

Link to video on adding sensor to Unitemp application:
   • Flipper Zero - Add sensor to Unitemp  

Please see the comments for links to the various resources used in this video.

Timeline:
0:00 - Introduction
0:27 - Connecting Logic Analyzer
0:54 - 10us delay (129C reported!)
1:29 - 40us delay (27C reported)
1:46 - wake up time
2:11 - 40us Logic analyzer capture
3:08 - 10us Logic analyzer capture
4:00 - furi_hal_i2c_tx return true (even on NACK)
4:52 - clock stretching
6:30 - clock stretching Logic analyzer capture
7:10 - summary

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