About unicyclebloke

unicyclebloke · 2025-01-21

I have an application running on STM32G491 which uses the RTC. There is an external 32768Hz crystal and a backup coin cell battery (I have checked that it is not depleted: 3.12V). There are two issues:Scenario #1: I pull the main battery, wait a bit,...

unicyclebloke · 2024-11-21

I need to calibrate a VL53L4CX and have been reading UM2923. The functions described do not seem to bear any obvious relationship to the functions in the STM32Cube middleware which was generated for my project, which I find confusing. I it is not cle...

unicyclebloke · 2024-05-15

I am studying the SMBUS stack code to understand how it works. My system has a smart battery. The battery periodically emits two messages intended for the charger (charging voltage and charging current). My software is the host. Sending commands to t...

unicyclebloke · 2024-05-10

I am using SMBus to communicate with a smart battery. After looking at the code, I decided against using the SMBUS middleware but to directly using the HAL_SMBUS_xxx calls. My STM32G491 is the host and sending read-word commands to the battery works ...

unicyclebloke · 2024-04-11

I have been simulating errors on the bus by removing the other node (a motor controller). As expected I see a number of failed transmissions. I can see that the FDCAN peripheral signals an Active Error on the bus (presumably as a result of not gettin...

unicyclebloke · 2024-11-26

Thanks. That turned out to be a red herring. The EE had wired DP and DM incorrectly. A simple mod and the CDC device worked immediately. Bah!!!

unicyclebloke · 2024-11-26

Did you get to the bottom of this? I seem to have the same issue (for a STM32H747BIT6). No errors are reported anywhere within MX_USB_DEVICE_Init(), but the data structure hUsbDeviceFS does not appear to be properly initialised. There is an array (of...

unicyclebloke · 2024-11-22

I'm grateful for your assistance. I have now written a state machine to guide a user through the calibration procedure and store the data to flash. A note for other readers: my stack for this task was 2KB and this led to an overflow in the cross talk...

unicyclebloke · 2024-11-21

Actually, what I meant by the second question is do I need to call GetCalibrationData() in the *field* code, modify specific fields using the values from my flash storage instance of the data structure? It seems like the idea of that is to preserve e...

unicyclebloke · 2024-11-21

Thanks. That's helpful. I have already added the necessary flash storage, figuring that would be the response. It does seem a bit strange that the device could not make a little of its own flash space available. No matter. Next up: a state machine to...

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User Activity

RTC resets or stalls even with backup battery

VL53L4CX: How/where to store calibration data

Struggling to receive messages on SMBUS

STM32G4 SMBUS goes into error state for some reason

STM32G491 FDCAN: Issue with error counters

Re: STM32H7 USB DEVICE CDC PROBLEM

Re: STM32H7 USB DEVICE CDC PROBLEM

Re: VL53L4CX: How/where to store calibration data

Re: VL53L4CX: How/where to store calibration data

Re: VL53L4CX: How/where to store calibration data