VL53L0X and RP Pico W

[carlosdelfino]

I'm trying to port the VL53L0X library for use with the RP Pico W for academic reasons, but I can't map the calls between the VL53L0X SDK and the RP Pico W SDK.

For example, the function

int32_t VL53L0X_read_multi(uint8_t address, uint8_t index, uint8_t *pdata, int32_t count)

would theoretically need to be adjusted to call the function

int i2c_read_blocking(i2c_inst_t *i2c, uint8_t addr, uint8_t *dst, size_t len, bool nostop)

Attempt to read specified number of bytes from address, blocking.

Am I right? Or should it be another way?
Thanks

[Zhiyuan.Han]

Hi

Your understanding is correct, inside VL53L0X some API I2C read/write function need read more than 4 registers at same time, so it need read_multi and wirte_multi function. 

You can find below information form the datasheet, below reg can be used to test the I2C reading function. 

Br

Zhiyuan.Han

[carlosdelfino]

I'm having trouble mapping the functions to the RP2040's I2C. I think the example I got isn't the best fit, and the VL53L1CB_SimpleRanging example I got from CubeMX doesn't compile. It's not for the VL53L0, but it would be a good reference. I found another code on the other computer, and I'll cite it tomorrow, but it's completely different from this one. I'm still having trouble adjusting the file for the platform.

[carlosdelfino]

After extensive reading of the datasheet and other guides, research with the support of chatGPT, and analysis of various codes, I ended up reverse-engineering the Pololu library. The final code is at https://github.com/RapportTecnologia/VL53L0X-RP2040-2350. As far as I've tested, it's working well, but I'd like your help with suggestions for improvements.

The code allows for easy adaptation to other microcontrollers; just review the I2C calls in the I2C library that comes with the module.

Have fun or try your hand at this wonderful distance sensor from STM.

[Zhiyuan.Han]

Hi 

Glad to know you have made it works from your side. 

The API porting work is more relay on the platform I2C read and write functions. if you have a mature one form on line search, that will easy your work.

Br

Zhiyuan.Han

[carlosdelfino]

I found this path easier. Using the library offered by STM seemed quite complete, but I was having difficulty porting it even though I only had to replace the I2C calls. But now that I'm more experienced with the landing process, I'm reviewing the original.