About LLope.31

LLope.31 · 2024-01-16

Hello everyone, I have a complex problem which I would like help from the memory experts and instruction optimization, if possible. I am trying to receive data using CDC_Receive_FS() call back, and, concurrently, process the data using an ISR which i...

LLope.31 · 2023-12-17

Hello everyone,I am working on a signal analyser device, which needs to transmit data serially as fast as possible (idealy 1Mbaud/s).I am doing the following loop to transmit: uint8_t buf_high[1] = {124}; // '|' uint8_t buf_low[1] = {48}; // '0' ini...

LLope.31 · 2023-11-14

Hello,I am trying to implement the DFU protocol in an Android app. I am following AN3156.I am using UsbDeviceConnection class for the control transfer in android. I am able to write to the memory to any address using the routines described in AN3156 ...

LLope.31 · 2023-10-07

Hello,I am trying to transmit some data on my STM32F042F6P6. But my PC's serial monitor only picks up some of it. Here is the code and the serial monitor output:void readAllRegs(void){ uint8_t value; for (uint8_t addr = 0x00; addr <= 0x2E; addr++...

LLope.31 · 2023-10-04

Hello everyone,I am trying to use both USB CDC and SPI on a STM32F042F6P6 MCU. Unfortunately, without even writing almost any code (just an HAL_SPI_TransmitReceive() and a CDC_Transmit_FS()) it says the flash memory overflows by 1484 bytes.Is this no...

LLope.31 · 2024-01-16

Ok, good to know that USB can be interrupted, and that is not the issue. Actually, the USB comms never fail now that I placed USB at lower priority 3.It's the ISR that is taking up all of the execution... but you say 350 cycles is not much, but I am ...

LLope.31 · 2023-12-18

Hello again everyone,I managed to achieve my goals regarding speed. I believe I understand what is happening better now.> The maximum you may easily get should be close to 64 kB/s.This is not true. The way you get more than that is easy: just call CD...

LLope.31 · 2023-12-17

Yes I was using the mechanism while(CDC_Transmit_FS) to avoid packets being dropped.But the changing packet size from 512 to 64 means I changed in cubemx the USB CDC Tx Buffer Size from 512 to 64. The actual intruction, CDC_Transmit_FS(buf, 1) still ...

LLope.31 · 2023-12-17

Thanks for the reply.So I reduced the Tx buffer size from 512 bytes to 64 bytes. This sped up the transmission significantly. I want to understand why this is.I understand that USB full speed transmits a frame of max 1023 bytes (with overhead) every ...

LLope.31 · 2023-11-30

Hello again,Today I successfully read the first 2 blocks of 2048 bytes.My confusion was I thought wTransferSize was a variable we could specify through wLength (the number of bytes to read, so I thought it was also the block size). But turns out I wa...

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Optimizing instructions for using a very frequent ISR along with USB CDC

USB CDC how to increase speed (baud rate) ?

STM32 DFU protocol DFU_UPLOAD problem

USB CDC data loss

32kB flash overflowing using just USB CDC and SPI

Re: Optimizing instructions for using a very frequent ISR along with USB CDC

Re: USB CDC how to increase speed (baud rate) ?

Re: USB CDC how to increase speed (baud rate) ?

Re: USB CDC how to increase speed (baud rate) ?

Re: STM32 DFU protocol DFU_UPLOAD problem