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stm32f1xx [2019/09/19 10:02] – [blue pill] RTC issue kingkevin | stm32f1xx [2020/02/12 01:18] – [blue pill] add black pill kingkevin | ||
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{{ : | {{ : | ||
- | This cheap board is often referred as blue pill in forums and sold under $2.50 as [[http:// | + | This cheap board is often referred as blue pill in forums and sold under $2.50. |
It has: | It has: | ||
* [[http:// | * [[http:// | ||
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Mine for example has a 10 kΩ pull-up (to 3.3 V) resistor on USB D+/PA12 instead if a 4.7kΩ (to 5 V), although USB devices use a 1.5 kΩ resistor to pull up (to 3.3 V) usually. | Mine for example has a 10 kΩ pull-up (to 3.3 V) resistor on USB D+/PA12 instead if a 4.7kΩ (to 5 V), although USB devices use a 1.5 kΩ resistor to pull up (to 3.3 V) usually. | ||
+ | ===== blue pill ===== | ||
+ | |||
+ | the [[https:// | ||
+ | |||
+ | advantages: | ||
+ | * correct 1.5 kΩ pull-up resistor on USB D+ | ||
+ | * RTC is usable at the same time as the LED | ||
+ | * has 4 mounting holes | ||
+ | * USB input diode protection | ||
+ | changes: | ||
+ | * LED is on PB12 (sink to enable it) | ||
+ | drawbacks: | ||
+ | * larger | ||
+ | * same length but with less pins | ||
+ | * only one 3.3V pin (instead of 2 on the blue pill) | ||
+ | * no 5V pin | ||
+ | * no VBAT pin | ||
+ | * one less GND pin | ||
+ | * no C15 and C14 pin | ||
+ | * different pinout | ||
===== core board ===== | ===== core board ===== | ||