stm32F030F4P6 — 不到NT 8元的32位元單片機

初始運作只需三個外圍器件 ， SWDIO跟  SWCLK 要接 10K 電阻(手上沒有10K，我用8.2K 運作也是OK的)，Boot0接560R接地即可運作。VDDA，VDD，VSS(GND) ，Boot0(GND) 都要適當接好，不要懸空。 如果要使用 I2C , SPI ，畫板時記得給上 pull-up R ，並預先考慮兩個以上I2C 或 SPI  devices的狀況，預留線路，應該就能使用愉快。唯一的困難是像我這樣的新手，要手焊 tssop20 有點難，需要練習一下。 ram看起來不大，不過一般應用應該是夠了，除非遇到像需要點陣字表這類的東西，很耗費存儲的，那就看情況是否需要加外部存儲。

32位元  mcu   , 32 !! 32 !! 32 !!   up to 48MHZ 

16kB of flash and 4kB of SRAM  , I2C x1  , SPI x 1 , USART x 2 , tssop20 package , with internal clock (HSI) 

cheap , stable , easy to use . 

參考 

https://www.st.com/content/ccc/resource/technical/document/application_note/b9/9b/16/3a/12/1e/40/0c/CD00167594.pdf/files/CD00167594.pdf/jcr:content/translations/en.CD00167594.pdf

VDD , VDDA –> 3.3V (VDDA  must  >=  VDD)

VSS –> GND

BOOT0 –> R —> GND

SWDIO –> 10K –> adaptor

SWCLK –> 10K –> adaptor

diy a breakout board ? 

hardiest part is soldering mcu chip onto pcb  (for me) , need a little practice .. 

easiest way to download sketch is   stlink-v2, HAL in cubeMX looks like this :

here , we use cubeMx + sw4stm32  as development tool . 

1. in sw4stm32 , create a workspace 

2. in cubeMx ,  assign project location in  that workspace , and check  “Generate Under Root “

3. after generating code , click “open” , then  sw4stm32 start !  enjoy ! 

if encounter any problem when flash  program , in sw4stm32  check  project debug  option . 

project -> properties -> debug/run setting-> edit (or new) 

here , make sure Interface = SWD , Reset = Software , and Frequency must equal to adaptor’s frequency 。 

if we want to use I2C device , ex:  I2C oled , in cubeMx must configure it  right . 

done !   now can try to  upload 1st   program . 

Using OLED 1306  :

• driver :  https://github.com/4ilo/ssd1306-stm32HAL

copy  inc/ssd1306.h  &  inc/font.h  to   inc/

copy  src/ssd1306.c  &  src/font.c  to   src/

modify  all   stm32fXXX_hal.h   to ur   _hal.h 

done !

if u want to use UART to upload firmware :

VDDA should be connected to power, otherwise chip is in reset state. If package has VSSA – it also should be connected (to GND).

To enter boot mode it is sufficient to connect BOOT0 to power during reset. Do not get confused with absent BOOT1 pin – it is in proper state internally. 设计的时候，就直接把CPU的BOOT1引脚接地（始终为0），就没有BOOT1引脚了

• pin 16 (VDD) to +3.3
• pin 5 (VDDA) to +3.3
• pin 15 (GND) to GND
• pin 1 (BOOT0) to +3.3
• pin 4 (RESET) to GND, temporarily
• pin 17 (USART1_TX) to RX of the FTDI-cable
• pin 18 (USART1_RX) to TX of the FTDI-cable