About DNeum.1

DNeum.1 · 2021-09-29

Hello,I try to write into program flash in block write. Therefore I have a functionwhich is executed from RAM:void ram_flash_write_block(uint32_t startaddress, const uint8_t *buf) { uint16_t i = 0; // enable flash block write FLASH->CR2 = FLASH...

DNeum.1 · 2021-09-28

Hello,I try to read from user flash. Everything is fine until I try to read from address beyond 0x10000. Then I get random values. I use SDCC (3.8.0 and 4.1.0, the behaviour is the same). My device is STM8AF5288 which has 64 KB of flash memory. A pro...

DNeum.1 · 2020-10-28

I use STM32F103C8T6 as SPI slave and want to send data on request by master.The master sends to the slave a byte, which has to be used to decide, what has to be doneor what data data has to be sent to the master, and a fill byte which is neededto shi...

DNeum.1 · 2020-10-16

I have a problem using CAN on STM32F103C8T6. I use this MCU on a bluepill board,a SN64HVD230 based CAN PHY and on the other end of the CAN bus a PiCAN2 board onRaspberry Pi. I drew a picture to show my setup:I want to have a 500 kbit/s-CAN-connection...

DNeum.1 · 2021-01-05

I "solved" the problem. If I raise the clock of my STM32F103 to 24 MHz, the master receives the correct slave answer in every transaction up to 125 kHz SPI speed. If I raise the MCU clock to 64 MHz, I have correct transfers up to SPI speed 500 kHz.

DNeum.1 · 2020-10-29

That sounds plausible. I did some further tests with incremented variables sent by master and try to send it back.SPI-RX-handler: //receive data volatile uint8_t read_byte=SPI1->DR; //send back SPI1->DR=read_byte; //clear Flag volatile uin...

DNeum.1 · 2020-10-28

Thank you for the quick reply. I made some additional tests.The master sends at a speed of 125 KHz.Even if I use the SPI1 peripheral without STM32 HAL in interrupt handler, whichmeans the stripped down interrupt handler looks this:switch(SPI1->DR){ c...

DNeum.1 · 2020-10-22

Since I used only powering by USB, but not the USB peripheral, I thought it would be no problem. But it was... Thank you for your patience.

DNeum.1 · 2020-10-19

Finally, I got it. I power the bluepill board via an external 3V3 source and not via USB any more. It may have something to do with the double usage of pins PA11 and PA12 with USB. I tried to remap CAN-RX/CAN-TX it to the alternative PB8/PB9, but it ...

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STM8AF5288: Program stops in Block write to flash

Read Access to flash beyond address 0x10000

STM32F103 SPI Slave strategy

STM32F103 CAN Arbitration lost

Re: STM32F103 SPI Slave strategy

Re: STM32F103 SPI Slave strategy

Re: STM32F103 SPI Slave strategy

Re: STM32F103 CAN Arbitration lost

Re: STM32F103 CAN Arbitration lost