Differences

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--- stm32f1xx [2018/01/28 11:51] – [USB DFU] add own bootloader kingkevin
+++ stm32f1xx [2020/02/12 01:18] – [blue pill] add black pill kingkevin
@@ Line 86: / Line 86: @@
 {{ :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:
   * [[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}}):
@@ Line 114: / Line 114: @@
   * no user button
   * board extends over headers
+  * the RTC is not stable when the on-board LED is toggled
 Here a rough {{:stm32f1xx:bluepill-6-stm32f103c8t6原理图.pdf|schematic}}, but there a many derivatives.
 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://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)
+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 =====