Electronics > Beginners

CS32F103C8T6 datasheet and tests (was:"UNEXPECTED idcode" flashing bluepill)

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iMo:
128MHz overclock is a standard option in your core, you would need an usb serial dongle however. Serial1 based tests should work fine @128M (with stm32).

RogerClark:
Yes.

I know it has the 128Mhz option

Thats what I tried and blink didnt seem to work, but I need to setup and check the same sketch on a STM32 BP just to confirm that the CS32 does not work at 128Mhz

RogerClark:
Interesting

The CS32 does not overclock very well

I added some more overclocking settings to my Core to do this testing.

And a STM32 BluePill worked fine right up to 128Mhz (16 multipler on the 8Mhz crystal)

But the fastest I could run the CS32 at was 80 Mhz (x 10 multiplier)

I checked the bit pattern for the x 10 vs x11 multipliers and the values are

    RCC_PLLMUL_10 = (0x8 << 18),
    RCC_PLLMUL_11 = (0x9 << 18),

So this doesn't look like they simply reduced the number of bits in that the PLL has.

It simply looks like it won't run as fast.

Note the GD32, runs fine at 120Mhz, so the CS32 probably isn't based on the GD32

I wanted a rude username:

--- Quote ---the fastest I could run the CS32 at was 80 Mhz
--- End quote ---

Could this mean the CS32 has lower headroom for high temperature operation?

The translated datasheet doesn't address operating temperature (or power consumption!), whereas the STM32F103 datasheet lists all of this in Table 9 (General operating conditions), giving a range of -40 to 85/105 °C depending on model.

iMo:
Yeah, all my stm32f103xx work fine at 128M. GD is flash-less chip so it may run even faster.
With the CS clone you may try to increase its number of flash wait states to achieve a higher clock. The default setting would be 2, try it with 3.
PS: you may add the "Number of flash WS" selection into your core :)

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