Changing VL53L5CX i2c address?

VBhat.1 · ‎2021-09-20

Hi, I am trying to use the vl53l5cx_set_i2c_address() function in order to change the i2c address, but it keeps returning -2, or VL53L5CX_COMMS_ERROR from the following line in vl53l5cx_set_i2c_address():

status |= WrByte(&(p_dev->platform), 0x7fff, 0x02);

The WrByte seems to fail. I would like to change the i2c address, in order to use multiple modules, but currently I can only use one. Any suggestions or advice would be appreciated. Thanks!

Peter BENSCH · ‎2021-09-20

Sorry, that was a wrong statement, because 0x52 is just the default address that can of course be changed: ~~The I2C address of the~~ ~~VL53L5CX~~ ~~is permanently preset in the sensor and cannot be changed. If you want to address several sensors, you have to separate them logically, e.g. with an I2C bus switch.~~

Good luck!

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/Peter

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VBhat.1 · ‎2021-09-21

VBhat.1 · ‎2021-09-21

Hi Peter, thanks for replying! If the VL53L5CX can't have it's i2c address changed, what does the vl53l5cx_set_i2c_address() function mentioned in the documentation and vl53l5cx_api.c file do?

It refers to pulling down LPn pins of all other devices not having their i2c address changed, and using set_i2c_address, then pulling LPn of other devices back high, and so forth until all devices have different addresses set.

Peter BENSCH · ‎2021-09-21

Sorry, I made a wrong statement. Now it is time to check why you are getting an error.

Regards

/Peter

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Peter BENSCH · ‎2021-09-21

Did you follow the guidelines in UM2884, section 2.3?

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VBhat.1 · ‎2021-09-21

Yes, right now I have only connected 1 VL53L5CX device to my i2c bus, and have LPn pulled high. The WrByte(&(p_dev->platform), 0x7fff, 0x02); in set_i2c_address still fails (returns 254), but I'm not sure exactly what it's doing. After the code fails I can't connect to the VL53L5CX again until I cycle power.

VBhat.1 · ‎2021-09-21

Should set_i2c_address be called before or after VL53L5CX_init()? Currently I am doing it after.

VBhat.1 · ‎2021-09-21

After I get the comms error status from the set_i2c_address function, using i2cdetect on my raspberry pi I can indeed see that the i2c address of the VL53L5CX has changed to my intended value, I just am not able to communicate with it at that address.

VBhat.1 · ‎2021-09-25

Hi Peter, do you have any more ideas as to how to set the i2c address? Has anyone else been able to do so successfully yet?