About JBeal.1

JBeal.1 · 2024-01-26

If I want my SPI bus to have the CLOCK line high already before the active-low CHIP_SELECT (ENABLE/) line goes low, is there a way to do that?I'm driving an AD9833 chip which requires at least 5 nsec time after CLOCK high, before ENABLE/ goes low. Lo...

JBeal.1 · 2023-12-26

I'm using a STM32L432KC Nucleo board, and reading a voltage with the 12-bit ADC. On this board the ADC Vref is connected to the board 3.3V, which in this case actually measures 3.315 V. With a 12-bit resolution, I would expect that 4095 ADC counts =...

JBeal.1 · 2023-12-09

I am using Nucleo STM32 L432KC board with STM32CubeIDE v1.12.1 and doing very basic DSP operations with data values read via ADC through DMA into a circular buffer. It works, but the math is slower than expected.Below is an example loop in my code. A...

JBeal.1 · 2023-12-05

I want to take readings from one ADC channel continually and use DMA to store them in a circular buffer. I do have working code which does this, see link below. However, the sampling happens more slowly than I expected.My question is about the rate a...

JBeal.1 · 2023-06-04

After doing "clean" on my project, the large majority of space in the project (5.7 / 6.1 MB or 93%) is occupied by the Drivers/ folder. I assume that can be easily re-created by any install of STM32CubeIDE during a compile anyway, so is it necessary ...

JBeal.1 · 2023-12-09

To answer my own question, I realized I had not even looked at the default compiler optimization flags https://community.st.com/t5/stm32cubeide-mcus/how-do-i-change-code-optimization/td-p/271208, and I discovered I was using -O0 (no optimization at a...

JBeal.1 · 2023-12-05

Ah, nevermind. Somehow I was imagining "sampling time" to be the entire ADC conversion time, but actually reading the datasheet I see that the total time is (sampling time + conversion time) and the latter is 12.5 cycles for 12 bit resolution, which ...

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Nucleo STM32L432KC ADC + DMA circular buffer, slower than expected?

Can I discard Drivers/ folder when archiving? My STM32F401 project folder is 6.1 MB after 'clean' but most (5.7MB) is just the Drivers/ folder

Re: STM32L432KC basic DSP loop. Any way to improve this?

Re: Nucleo STM32L432KC ADC + DMA circular buffer, slower than expected?