Hi everyone: I am working on a project with VL53L8CX Time-of-Flight sensor from Pololu. I integrated it with NUCLEO-H755ZI-Q board over SPI interface based on the example and driver provided in the STMicro en.STSW-IMG040 software package. I configured the SPI3 (MCLK, MISO, and MOSI) on the CN7 to communicate with the sensor. I also have PA4 for SPI3_NSS and PC7 for /PLn signal. The project compiled successfully. However, I believe I am not able to read the registers properly.
The firmware reads the "device_id" and "revision_id" from the sensor in the vl53l8cx_is_alive() to determine if the sensor exists. The return values different every time I tried to read. I was able to capture the protocols on the scope, and confirmed the reading values are match with the data shown on the scope. The following scope capture shows the communication:
1. Sending 0x00 to address 0x7fff. The yellow signal is for the MCLK, blue for MOSI, purple for MISO, and green for /CS.
2. Receiving 0x0 from address 1 for "revision_id".
3. Another reading 0x4 from address 1 for "revision_id".
I tried to pull up the MISO signal to 3.3V by 10K resister or pull-down to GND with 47K resister. They don't resolve the issue. Tried different communication baud rate and they don't help. I also tried different module and they seems to have the same issue. At this point, I am not sure if the issue I am facing is in the hardware or software. I am looking forward to hearing your opinion and suggestions. Thanks!
