About Danish1

Danish1 · 2024-01-22

I have been using microSD chips reliably for many years with stm32f4, stm32h7 and stm32l4.But for one of my products, where space is at a premium, I am trying to use a SD-NAND chip XTSD04G, and I am running into occasional errors where an SDIO R1 com...

Danish1 · 2021-12-20

Does anyone have any experience of trying to control non-exisistant pins?I have a design that takes stm32f767 in the lqfp100 package. But none seem to be available.Looking around, I managed to procure a small run of stm32f779* in the wlcsp180 package...

Danish1 · 2021-01-27

I have a stm32f427 with 1Mx16 external SRAM and SDMMC.I am reading the SDMMC by DMA into the SRAM in two blocks of 512 bytes into a 1024 byte buffer.The SRAM is mapped from 0x64000000 - 0x641fffff. Address and data are not multiplexedI have now disco...

Danish1 · 2019-09-18

I am looking into the possibility of using a stm32 microcontroller (probably stm32f030) to directly* control the power transistors in a switch-mode power supply, in order to generate a high-power waveform.My current thinking has a PMOS switch transis...

Danish1 · 2019-05-13

I am in the process of porting some code from stm32F405 to stm32L496 in the hope of reducing current consumption.One of the things my code does is write to an SD card, and because it writes a lot of data, I useSD_CMD_WRITE_MULT_BLOCKAnd then repeat {...

Danish1 · 2024-04-23

I wouldn't expect FreeRTOS to cause a problem.Your example is not complete, in that we cannot see where ADDRESS is defined, nor where data is defined and set to its expected value of 1.Your example code does not make use of the erasing/programming re...

Danish1 · 2024-04-14

Setting a breakpoint-on-write is the only way to know for certain what processor-instruction wrote to a specific memory-location. But don’t forget that DMA can also write to memory; how strongly do you know that isn’t the problem?Facing a similar pro...

Danish1 · 2024-04-12

I think you misunderstand the data-sheet.Those are not "recommended" pull-up values. That is the effective resistance of built-in pull-up resistors, which you can choose to turn on (or not) when the pin is programmed as digital-input or open-drain-ou...

Danish1 · 2024-04-10

Where did you see this rating of 15uA (microamps)?I would expect the rating to be 15mA (milliamps), 1000 times as much.I think you are misunderstanding the term Multiplex. That is where different signals are shared on the same pin. Perhaps a better t...

Danish1 · 2024-04-09

As this is STATIC ram, you don’t need the clock to maintain the stored values in SRAM.But when there’s no clock, you can’t read from or write to it.You might wonder who/what would access the SRAM while the processor is sleeping. An answer is DMA. You...

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SDIO Error when use SD NAND chip

How are non-existent pins / ports wired up

DMA to external SRAM misses bytes part-way through transfer

pwm with asymmetric dead-time

stm32l496 SDMMC Correct Sequence for writing multiple blocks

Re: stm32L5 write flash problem

Re: how to detect which line of code has modified the global variable (not debug mode)

Re: Typical pull-up resistance value

Re: Multiplex 1 output to 12

Re: On STM32C0, is SRAM preserved in Sleep mode if RCC_AHBSMENR.SRAMSMEN=0?