外形和BluePill一样，核心应该是他们自己流片的RP2040，

133M的双核M0+，264kB的SRAM，2MB的FLASH，40nm工艺 7x7 QFN-56

看外部配置看起来很豪华，不过配个M0+核心感觉怪怪的，感觉像是给劳斯莱斯配了个3缸的涡轮增压发动机。起码配个M4F核心才说得过去。

综合下来感觉还是BluePill更好一些，MCU选择更广，成本更低。

顺便开源个之前练习lceda画的PluePill板子，已经打样验证过。

https://oshwhub.com/spadger/bluepill

https://www.raspberrypi.org/blog/raspberry-pi-silicon-pico-now-on-sale/

Today, we’re launching our first microcontroller-class product: Raspberry Pi
Pico. Priced at just $4, it is built on RP2040, a brand-new chip developed
right here at Raspberry Pi. Whether you’re looking for a standalone board
for deep-embedded development or a companion to your Raspberry Pi computer,
or you’re taking your first steps with a microcontroller, this is the board
for you.
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