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another gotcha

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2024-04-23 16:17:41 +01:00
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- Code size is improved through use of "XW" instructions, which are not upstream - Code size is improved through use of "XW" instructions, which are not upstream
- Supports USBD peripheral *only* (i.e. not USBFS) - Supports USBD peripheral *only* (i.e. not USBFS)
- USBD and USBFS are completely different, and the QFN28 package (which is available in largest quantities on LCSC) only bonds out USBD - USBD and USBFS are completely different, and the QFN28 package (which is available in largest quantities on LCSC) only bonds out USBD
- Note that USBD requires a USB A-A cable if using the official devkit
- Runs off of internal 8 MHz oscillator (despite stability concerns) - Runs off of internal 8 MHz oscillator (despite stability concerns)
- The HSI oscillator's tolerance (-1.0% to +1.6%) is well outside of the range specified for USB full speed ($\pm$ 0.25%), but it seems to work in practice n=1 ¯\\\_(ツ)\_/¯ - The HSI oscillator's tolerance (-1.0% to +1.6%) is well outside of the range specified for USB full speed ($\pm$ 0.25%), but it seems to work in practice n=1 ¯\\\_(ツ)\_/¯
- Should work across most of the CH32V2xx and CH32V3xx family with appropriate changes to hardcoded constants. - Should work across most of the CH32V2xx and CH32V3xx family with appropriate changes to hardcoded constants.