48.1. sent decode

48.1.1. Overview

  • The example shows the measure PWM wave of gptmr and uses DMA to collect and decode sent signal

  • After initializing the SENT signal decoding instance, it continuously waits for SENT signals from the encoder

  • The pwm_process_sent API function within the example decodes SENT signals. It returns success upon parsing a complete frame of SENT signal; if the signal is incomplete or not a SENT signal, it returns an error

  • The example outputs only successfully decoded SENT signals via UART. Failed decoding attempts are filtered out, and the system continues to wait for the next complete SENT signal.

48.1.2. Board Setting

  • Please refer to Pin Description for specific board.

  • Connect external SENT signal to GPTMR capture pin.The SENT signal can be generated using the sent/encode example.

48.1.3. Running the example

  • Run decode first, and then run encode.

  • Running the example,if there is a SENT signal input, the serial terminal outputs the following information,which are the sent protocol frame

sent signal decode demo
stat:00 data:01 02 03 04 05 06 07 08 crc:0b  pause:true

stat:00 data:01 02 03 04 05 06 07 08 crc:0b  pause:true

stat:00 data:01 02 03 04 05 06 07 08 crc:0b  pause:true

stat:00 data:01 02 03 04 05 06 07 08 crc:0b  pause:true

stat:00 data:01 02 03 04 05 06 07 08 crc:0b  pause:true

stat:00 data:01 02 03 04 05 06 07 08 crc:0b  pause:true

stat:00 data:01 02 03 04 05 06 07 08 crc:0b  pause:true

stat:00 data:01 02 03 04 05 06 07 08 crc:0b  pause:true

stat:00 data:01 02 03 04 05 06 07 08 crc:0b  pause:true

stat:00 data:01 02 03 04 05 06 07 08 crc:0b  pause:true