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stm32f1xx [2019/09/19 12:02]
kingkevin [blue pill] RTC issue
stm32f1xx [2020/02/12 09:58] (current)
kingkevin [blue pill] add pictures
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 {{ :stm32f1xx:blue-pill_pinout.svg?0x400|}} {{ :stm32f1xx:blue-pill_pinout.svg?0x400|}}
  
-This cheap board is often referred as blue pill in forums and sold under $2.50 as [[http://www.aliexpress.com/item/1pcs-STM32F103C8T6-ARM-STM32-Minimum-System-Development-Board-Module-For-arduino/32478120209.html|STM32 minimum system development board]].+This cheap board is often referred as blue pill in forums and sold under $2.50.
 It has: It has:
   * [[http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1031/LN1565/PF164476|STM32F103C8T6]] MCU ([[http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00161566.pdf|DS5319 datasheet]], {{:stm32f1xx:CD00161566-STM32F103x8_datasheet.pdf|archive}}):   * [[http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1031/LN1565/PF164476|STM32F103C8T6]] MCU ([[http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00161566.pdf|DS5319 datasheet]], {{:stm32f1xx:CD00161566-STM32F103x8_datasheet.pdf|archive}}):
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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.
  
 +===== black pill =====
 +
 +{{ :stm32f1xx:black-pill_bottom-mini.jpg?0x400|}}
 +{{ :stm32f1xx:black-pill_top-mini.jpg?0x400|}}
 +
 +the [[https://stm32-base.org/boards/STM32F103C8T6-Black-Pill.html|black pill]] is a "fixed" version of the blue pill, but I find it quite inferior.
 +
 +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)
 +  * different pinout
 +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 (used for OSC32)
 ===== core board ===== ===== core board =====
  
stm32f1xx.1568887320.txt.gz · Last modified: 2019/09/19 12:02 by kingkevin