Update README file
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Gregory Nutt
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@ -8,32 +8,91 @@ This board is available from several vendors on the net, and may
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be sold under different names or no name at all. It is based on a
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STM32F103C8T6 and has a DIP-40 form-factor.
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This is the board pinout based on its form-factor:
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There are two versions of very similar boards: One is red and one is
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blue. See http://www.stm32duino.com/viewtopic.php?f=28&t=117
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USB
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___
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-----/ _ \-----
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|B12 GND|
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|B13 GND|
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|B14 3.3V|
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|B15 RST|
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|A8 B11|
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|A9 B10|
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|A10 B1|
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|A11 B0|
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|A12 A7|
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|A15 A6|
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|B3 A5|
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|B4 A4|
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|B5 A3|
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|B6 A2|
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|B7 A1|
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|B8 A0|
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|B9 C15|
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|5V C14|
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|GND C13|
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|3.3V VB|
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|_____________|
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The Red Board:
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Good things about the red board:
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- 1.5k pull up resistor on the PA12 pin (USB D+) which you can
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programatically drag down for automated USB reset.
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- large power capacitors and LDO power.
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Problems with the red board:
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- Silk screen is barely readable, the text is chopped off on some of
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the pins
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- USB connector only has two anchor points and it is directly soldered
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on the surface
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- Small reset button with hardly any resistance
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The Blue Board:
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Good things about the blue board:
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- Four soldered anchor point on the USB connector. What you can't tell
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from this picture is that there is a notch in the pcb board and the USB
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connector sits down inside it some. This provides some lateral stability
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that takes some of the stress off the solder points.
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- It has nice clear readable silkscreen printing.
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- It also a larger reset button.
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Problems with the blue board:
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- Probably won't work as a USB device if it has a 10k pull-up on PA12. You
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have to check the pull up on PA12 (USB D+). If it has a 10k pull-up
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resistor, you will need to replace it with a 1.5k one to use the native
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USB.
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- Puny voltage regulator probably 100mA.
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A schematic for the blue board is available here:
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http://www.stm32duino.com/download/file.php?id=276
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Both Boards:
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Nice features common to both:
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- SWD pins broken out and easily connected (VCC, GND, SWDIO, SWCLK)
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- USB 5V is broken out with easy access.
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- User LED on PC13
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- Power LED
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- You can probably use more flash (128k) than officially documented for
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the chip (stm32f103c8t6 64k), I was able to load 115k of flash on mine
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and it seemed to work.
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Problems with both boards:
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- No preloaded bootloader * to me this isn't really a problem as the
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entire 64k of flash is available for use
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- No user button
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This is the board pinout based on its form-factor for the Blue board:
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USB
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___
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-----/ _ \-----
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|B12 GND|
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|B13 GND|
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|B14 3.3V|
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|B15 RST|
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|A8 B11|
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|A9 B10|
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|A10 B1|
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|A11 B0|
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|A12 A7|
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|A15 A6|
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|B3 A5|
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|B4 A4|
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|B5 A3|
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|B6 A2|
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|B7 A1|
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|B8 A0|
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|B9 C15|
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|5V C14|
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|GND C13|
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|3.3V VB|
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|_____________|
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Contents
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========
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@ -57,24 +116,24 @@ succesfully, and is blinking on panic / assertion failed.
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UARTs
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=====
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UART/USART PINS
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---------------
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UART/USART PINS
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---------------
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USART1
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RX PA10
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TX PA9
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USART2
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CK PA4
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CTS PA0
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RTS PA1
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RX PA3
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TX PA2
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USART3
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CK PB12
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CTS PB13
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RTS PB14
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RX PB11
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TX PB10
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USART1
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RX PA10
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TX PA9
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USART2
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CK PA4
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CTS PA0
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RTS PA1
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RX PA3
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TX PA2
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USART3
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CK PB12
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CTS PB13
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RTS PB14
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RX PB11
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TX PB10
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Default USART/UART Configuration
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--------------------------------
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@ -84,26 +143,26 @@ USART1 (RX & TX only) is available through pins PA9 (TX) and PA10 (RX).
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Timer Inputs/Outputs
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====================
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TIM1
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CH1 PA8
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CH2 PA9*
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CH3 PA10*
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CH4 PA11*
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TIM2
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CH1 PA0*, PA15, PA5
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CH2 PA1, PB3
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CH3 PA2, PB10*
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CH4 PA3, PB11
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TIM3
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CH1 PA6, PB4
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CH2 PA7, PB5*
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CH3 PB0
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CH4 PB1*
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TIM4
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CH1 PB6*
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CH2 PB7
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CH3 PB8
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CH4 PB9*
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TIM1
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CH1 PA8
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CH2 PA9*
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CH3 PA10*
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CH4 PA11*
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TIM2
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CH1 PA0*, PA15, PA5
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CH2 PA1, PB3
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CH3 PA2, PB10*
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CH4 PA3, PB11
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TIM3
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CH1 PA6, PB4
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CH2 PA7, PB5*
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CH3 PB0
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CH4 PB1*
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TIM4
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CH1 PB6*
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CH2 PB7
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CH3 PB8
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CH4 PB9*
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* Indicates pins that have other on-board functions and should be used only
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with care (See board datasheet).
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