Arduino for STM32

It has been a long time since I first installed the official STM core. I do have a vague recollection of having to install the programmer code and make sure that it was in the path. I see in other threads here people saying that they have STM32_Programmer_CLI.exe in a directory somewhere under their ...

I don't think "Get Board info" is a definitive test. What happens if you just try to upload something? Select Upload method: "STM32CubeProgrammer (SWD)" first. That works for me regardless of whether the code already loaded in the board has USB support or not. Without USB support, no COM port ...

Maybe you mean STM32F103C8T6? If so that has two I2C peripherals, and you should be able to define a second "TwoWire" as shown here https://github.com/stm32duino/wiki/wiki/API#i2C. For your STM32F405 pyboard, maybe you can use STM32DUINO and forget python? You might have to create your own board ...

I'm not sure why you would have selected board "Generic STM32F103C6/fake STM32F103C8" in the first place, unless the chip was marked C6. Fake C8s may have less than 64K, but could well have 64K or 128K, so I think that board name is a bit confusing. However, the fact that you have that as a ...

As I said, I'm no Arm assembly expert, but I'm always willing to learn... Given you can see in the assembly listing that the ldrh instructions are only 2 bytes, and it must have space to identify the instruction (op code of some sort), and two registers, there can't be very many bits to use for the ...

Also, the attribute volatile will / might change the compiler code generator. I will check this out. ... Now, arm assembler is not really my thing, I grew up with the pdp11. Well, I can't see anything at all in the fragment of assembly code that you showed that would be moving data to the GPIO ODR ...

... ------- C code ----------- for(k=0;k<maxdata;k++) { // fill array with alternating 0 and 1 if(( k & 1) == 0) datarray[k] = 0x0; else datarray[k] = 0xffff; } t1 = micros(); // this does not serve any purpose now, it just generates a bl micros, which is easily found in the dump file snapshot ...

... I cannot see any good way to unroll the loop since I need to change the array index, but I have to study ARM assmbler, The ldrh.w and the strh could be replicated, but R7 needs to change.....+2 i guesss... ldrh.w r1,[r7],#2 strh r1,[r2,#12] adds r7,#2 this should be 4 instructions per move, so ...

CTRL : 40000000 CYCCNT : 40000000 80 0 ------------------------------------------ Then I add the cycle counter enable, CYCCNT does not change. ----------------------------------------- CTRL : 40000000 CYCCNT : 40000000 CYCCNT : 40000000 80 0 ------------------------------------- 0x40000000 for CTRL ...

1073741824 = 0x40000000 which looks like a plausible reset value for CTRL, so is that DWT_CTRL (at 0xE0001000) or DWT_CYCCNT (at 0xE0001004) that you are showing there? If that is really CYCCNT, what is in CTRL? That could indicate if the cycle counter is truly not implemented, or maybe (more likely ...