Can I use platform::flash in stm32f030c8t6?

[zhangzq71]

I got this error when running 'lbuild build'
ERROR: Cannot resolve name 'modm:platform:flash' of type Module!

what is the problem?

[salkinium]

The Module modm:platform:flash is only available for STM32F4 and STM32G0, because I was lazy and only implemented it for those two Flash peripherals:
https://github.com/modm-io/modm/blob/develop/src/modm/platform/flash/stm32/module.lb#L20

You will have to port this to STM32F0 or use raw register access.

[zhangzq71]

Ok, thanks, I got it.

[salkinium]

I compared the STM32F0 and STM32G0 Reference Manual sections on the Flash Peripheral, and they seem to work very similiarly with 1-2kB page size, only some registers bit fields have different names (FLASH_SR_BSY1 vs FLASH_SR_BSY).

So if you have time and motivation you could adapt the STM32G0 driver for the STM32F0 one.

[zhangzq71]

oh? that sounds good, let me try. thanks.

[zhangzq71]

it can't directly use STM32G0 driver for STM32F0,

modm_ramcode uint32_t
Flash::erase(uint8_t index)
{
	FLASH->SR = FLASH_SR_ERR;
	FLASH->CR = FLASH_CR_STRT | FLASH_CR_PER |
			((index << FLASH_CR_PNB_Pos) & FLASH_CR_PNB_Msk);
	while(isBusy()) ;
	FLASH->CR = 0;

	return FLASH->SR & FLASH_SR_ERR;
}

STM32F0 FLASH_CR register doesn't have FLASH_CR_PNB_Pos bit.

[salkinium]

Oh, that's sad! I guess the drivers are a little more different than I thought. I think I read something about accessing a memory location inside flash, and then the hardware automatically calculates the sector/page from that. But it's all inconsistent across STM32. I was a little overwhelmed by all the little differences like this, hence only implementing it for two families to at least get something started.

[zhangzq71]

You've done most of the work, I think there is slight difference, I check the STM32 user manual to see if I can get the STM32F0 flash work.