add support for at32f415 and at32f413

[vcore85]

This PR add support for artery at32f415 and at32f413 . They are almost fully compatible with stm32f103 ,but have higher clock and little difference. The at32f413 need to set RCC_CFGR_PLLRANGE in RCC_CFGR register when PLL range great than 72Mhz . The RCC_CFGR_PLLRANGE bit is reserved in stm32f103 series . While at32f415 do not need to set RCC_CFGR_PLLRANGE bit . They can run stably at 120Mhz . The RCC_CFGR_USBPRE_DIV2_5 use bit 23 which is also reserved in stm32f103 series . at32f413 can run usb and canbus ，but need to make small change in usbfs.c . at32f415 can only run canbus at now . There are some changes in i2c.c for at32f413/at32f415 running i2c at the speed of 100k and 400k .

signed-off-by: Albert Lin [email protected]

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[KevinOConnor]

Thanks. I'm not sure I understand the implications of this change. What happens if one runs the unmodified stm32f103 Klipper code on the at32f413/at32f415 chips?

-Kevin

[vcore85]

Thanks. I'm not sure I understand the implications of this change. What happens if one runs the unmodified stm32f103 Klipper code on the at32f413/at32f415 chips?

-Kevin

The unmodified stm32f103 Klipper code with canbus runs well on the at32f413/at32f415 chips in most situation. But the Klipper code with usb interface can not run on at32f413 before the change of usbfs.c . The changes of mcu clock and i2c.c can make the at32 chips running hardware i2c with 400k speed which the eddy coil needed.