About Johi

Johi · 2024-01-01

One of the practices of software design is to use volatile buffers when ISR and main loop access the data in the same buffers. This makes sure certain compiler register optimisations do not create unreliable code.If I look at the HAL code for the USA...

Johi · 2023-12-10

Hello,I have 3 of these (chinese origin) boards, 2 are failing communication, 1 is ok.In essence my STLINK-V3SET fails to connect to the board but the led's on the brand new board are blinking. Therefore the MCU processor is running. I measured the 3...

Johi · 2023-09-09

I am porting ILI9341 code from Keil to Cube MX.The original code contains: void LCD_WR_REG(vu16 regval) { regval=regval; //Ê¹ÓÃ-O2ÓÅ»¯µÄÊ±ºò,±ØÐë²åÈëµÄÑÓÊ± LCD->LCD_REG=regval;//Ð´ÈëÒªÐ´µÄ¼Ä´æÆ÷ÐòºÅ } vu16 seems to be __IO uint16_t i.e. volati...

Johi · 2023-09-05

The following message appears as a warning each time I compile.This means I have to check each time for warnings.How can I get rid of this message?

Johi · 2023-06-17

I made an application that uses burst DMA on T2 of an STM32F407VET6 to create morse code pulses as a challenge for Burst DMA..My strategy is to write to ARR, the reserved register in between and CCR1 to make pulses of various width and duty cycle as ...

Johi · 2024-01-01

I still wonder what the right approach to the challenge you are facing is?I could program the whole thing without any transformation (as far as I can see).But can you be a bit more specific why you are using the transformation anyway?Maybe share the ...

Johi · 2024-01-01

Maybe it is agood idea to check the hypothesis of the dynamic memory allocation by the serial part first.Therefor you could build a small memory manager based on a static array. Or even replace the dynamic part by a static part. This could point you ...

Johi · 2024-01-01

Hello CesarFA606I hope you solved your problem by now.If not, send me PM and I will share my own lib to do Modbus.Happy New year.

Johi · 2023-12-31

Hello Sax,Thank you for the answer: maybe I did not understand the question to well but shifting and adding the inverse array can be done as below: (or you could to both operations in 1 loop). for (int i=0;i<array_size;i++) { if (i-delayInCounte...

Johi · 2023-12-31

I am not familiar at all with DSP but do have some mathematical background, so therefore this question.arm_fir_f32 (&fir_instance, *&adc_buffer, *&fir_out_arm, 1024);* @defgroup FIR Finite Impulse Response (FIR) Filters => this is a function that tra...

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HAL USART serial buffer pointers not declared volatile?

STM32F407VET6 ICB JLINK : No device found

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unknown referenced nature fr.ac6.mcu.ide.core.MCUProjectNature

LL_TIM_EnableDMAReq_CC1 triggers DMA correctly, LL_TIM_EnableDMAReq_UPDATE does not.

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Re: Constant Fraction Discriminator

Re: Constant Fraction Discriminator