@klillas

Kim Lillås

@klillas

Professional software developer with an interest in anything and everything technical

Joined January 2024

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Kim Lillås's blogs

Owning my mistakesowningmymistakes.hashnode.dev5 posts

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KLKim Lillåsowningmymistakes.hashnode.devFeb 11, 2024 · 2 min read

Selecting the highest resolution STM32 USART clock divisor

STM32 USART stores a clock divisor into its USART_BRR register to configure the baudrate of the USART. The BRR register only has 16 bits in use, with the most significant 12 bits storing the clock divisor. The clock divisor and 8/16 sampling rate set...

KLKim Lillåsowningmymistakes.hashnode.devFeb 7, 2024 · 1 min read

Careful about function-like macro parameter naming

I needed to create a function-like macro which set a parameter in a default settings struct, simple enough. struct Settings { unsigned enabled; }; struct Settings defaultSettings; #define SetEnabled(enabled) (defaultSettings.enabled = enabled) ...

KLKim Lillåsowningmymistakes.hashnode.devJan 31, 2024 · 2 min read

CaPiTaLiZaTiOn

I was in the middle of adding DMA to my STM32 QuadSPI driver using the ST HAL layer. For the HAL layer to update its QSPI state I need to catch the QUADSPI_IRQn IRQ and call the corresponding HAL QSPI IRQ-handler. The assembler code below is the STM3...

KLKim Lillåsowningmymistakes.hashnode.devJan 30, 2024 · 2 min read

Yes, you can damage flash memory

I have been writing a driver and hooking up LittleFs to an external SPI connected flash memory, W25Q32BV from Winbond with 32Mbit of memory with 1024 erasable sectors. It worked well, I could write and read data and the file system was working just f...

KLKim Lillåsowningmymistakes.hashnode.devJan 23, 2024 · 2 min read

Keep those configs alive or forever regret it

For today's mistake I was initializing LittleFs by defining its lsf_config struct inside my wrapper code init function. static lfs_t fileSystem; int LfsReadCallback(const struct lfs_config *c, lfs_block_t block, lfs_off_t off, void *buffer, lfs_size...

Kim Lillås

About

Available for

Kim Lillås's blogs

Recently published

Selecting the highest resolution STM32 USART clock divisor

Careful about function-like macro parameter naming

CaPiTaLiZaTiOn

Yes, you can damage flash memory

Keep those configs alive or forever regret it

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Kim Lillås

About

Available for

Kim Lillås's blogs

Recently published

Selecting the highest resolution STM32 USART clock divisor

Careful about function-like macro parameter naming

CaPiTaLiZaTiOn

Yes, you can damage flash memory

Keep those configs alive or forever regret it