About DerekR

DerekR · 2023-01-05

MCU: STM32L4R9ZGJ6Hardware: Custom battery powered boardLED: ARGB1313HSDesired LED functionality: Blink, on/off, fade in/out ("Breathing")Hello,I am familiar with a regular timer and how they can drive a RGB LED using multiple channels (CCx registers...

DerekR · 2022-10-25

Details:MCU: STM32L4R9ZGJ6IDE: STM32CubeIDE v1.6.1SDK: STM32Cube_FW_L4_V1.14.0Board: Custom PCBHello,I am seeing really strange behavior where bits 31-24 in the RCC->CSR register are usually always 0. I have verified this behavior on two boards. The ...

DerekR · 2022-01-31

BackgroundHardware:STM32L4R9ZGJ6 (1 MB flash)Custom boardSoftware:STM32CubeIDE v1.6.1STM32CubeProgrammer v2.8.0Hello,I have a couple questions.Question 1: What is the difference between the user configuration option bits DB1M and DBANK?According to t...

DerekR · 2021-11-17

Some Background:MCU: STM32L4R9ZGJ6SDK: STM32Cube_FW_L4_V1.14.0Programmer: STM32CubeProgrammer v2.2.0External Flash: OSPI (MT35XL512ABA1G12)Application IDE: STM32Cube IDE 1.6.1External Loader IDE: Keil uVision 5.16aProject is was started on the STM32L...

DerekR · 2021-11-03

Hello,Some background:STM32CubeIDE 1.6.1MCU: STM32L4R9ZGJ6SDK: STM32Cube_FW_L4_V1.14.0 (Yes I know it's old ~ 2019) Project is too large to update at the moment.I am currently debugging external DAC audio issues. I reverted to using simple SAI blocki...

DerekR · 2023-01-10

That's what I suspected and needed to know, thanks! It seems the only option for using the STM32L4R9 MCU only is to use one of the low power sleep modes that doesn't clock gate the PWM peripheral.Thanks,Derek

DerekR · 2023-01-09

@Peter BENSCH Can you confirm that the LPTIM can only drive one GPIO? I only see one compare register in the datasheet (LPTIM_CMP). Any other way to PWM a RGB LED in STOP mode?Thanks,Derek

DerekR · 2023-01-06

Hey Peter,The STM is also doing a bunch of other stuff such as driving an AMOLED touch display using TouchGFX, playing audio, reading various sensors over I2C/SPI/UART, etc. The HCLK is running at 120 MHz.Thanks,Derek

DerekR · 2022-10-26

I agree that writing to registers takes less lines of code, but it's not nearly as user friendly as an API and takes much longer unless you know the processor inside and out. As someone who works with different MCU's on a week to week basis, I don't ...

DerekR · 2022-10-26

I am updating my fix as the previous one did not work 100% even though the code ran fine.Fix: Just delete HAL_RCC_DeInit() from the end of the bootloader and allow the application to reconfigure it as necessary.I originally had moved HAL_RCC_DeInit()...

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Can a low power timer (LPTIM) drive an RGB LED in STOP mode?

STM32L4R9 reset reason flags always 0 (RCC->CSR)

Difference between user option bits DB1M and DBANK - STM32L4R9

OSPI - Debugging external loader and strange write failure

HAL_SAI_Transmit() does not stop the I2S clocks when complete

Re: Can a low power timer (LPTIM) drive an RGB LED in STOP mode?

Re: Can a low power timer (LPTIM) drive an RGB LED in STOP mode?

Re: Can a low power timer (LPTIM) drive an RGB LED in STOP mode?

Re: STM32L4R9 reset reason flags always 0 (RCC->CSR)

Re: STM32L4R9 reset reason flags always 0 (RCC->CSR)