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Update hardware.md #169

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29 changes: 12 additions & 17 deletions src/intro/hardware.md
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Expand Up @@ -8,37 +8,32 @@ Let's get familiar with the hardware we'll be working with.
<img title="F3" src="../assets/f3.jpg">
</p>

We'll refer to this board as "F3" throughout this book.

What does this board contain?

- A STM32F303VCT6 microcontroller. This microcontroller has
- A [STM32F303VCT6](https://www.st.com/en/microcontrollers/stm32f303vc.html) microcontroller. This microcontroller has
- A single-core ARM Cortex-M4F processor with hardware support for single-precision floating point
operations and a maximum clock frequency of 72 MHz.

- 256 KiB of "Flash" memory. (1 KiB = 10**24** bytes)

- 48 KiB of RAM.

- many "peripherals": timers, GPIO, I2C, SPI, USART, etc.

- lots of "pins" that are exposed in the two lateral "headers".
- Many integrated peripherals such as timers, I2C, SPI and USART.

- **IMPORTANT** This microcontroller operates at (around) 3.3V.
- General purpose Input Output (GPIO) and other types of pins accessible through the two rows of headers along side the board.

- A USB interface accessible through the USB port labeled "USB USER".

- An [accelerometer] and a [magnetometer][] (in a single package).
- An [accelerometer](https://en.wikipedia.org/wiki/Accelerometer) as part of the [LSM303DLHC](https://www.st.com/en/mems-and-sensors/lsm303dlhc.html) chip.

[accelerometer]: https://en.wikipedia.org/wiki/Accelerometer
[magnetometer]: https://en.wikipedia.org/wiki/Magnetometer
- A [magnetometer](https://en.wikipedia.org/wiki/Magnetometer) as part of the [LSM303DLHC](https://www.st.com/en/mems-and-sensors/lsm303dlhc.html) chip.

- A [gyroscope].
- A [gyroscope](https://en.wikipedia.org/wiki/Gyroscope) as part of the [L3GD20](https://www.pololu.com/file/0J563/L3GD20.pdf) chip.

[gyroscope]: https://en.wikipedia.org/wiki/Gyroscope
- 8 user LEDs arranged in the shape of a compass.

- 8 user LEDs arranged in the shape of a compass
- A second microcontroller: a [STM32F103CBT](https://www.st.com/en/microcontrollers/stm32f103cb.html). This microcontroller is actually part of an on-board programmer and debugger named ST-LINK and is connected to the USB port named "USB ST-LINK".
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While it is possible that there's a new DISC1 version of this board, in many cases the ST-Link/v2 is implemented via a STM32F103C8 MCU. I'd prefer to leave out the the part after the 103 to cater for both cases.

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Not sure what you are getting at. Is there an alternative version of the same board? Shouldn't it have a different part number then?

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Not sure what you are getting at. Is there an alternative version of the same board? Shouldn't it have a different part number then?

Yes. Typically the discoveries have a different part number but in this case there're just three revisions: "On-board ST-LINK/V2 for PCB version A or B or ST-LINK/V2-B for PCB version C and newer". Revision A and B have a STM32F103C8, revision C is a STM32F103CB.

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What about

This microcontroller is actually part of an on-board programmer / debugger and is connected to the USB port named "USB ST-LINK".

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You mean striking the previous sentence? Works for me.


- A second microcontroller: a STM32F103CBT. This microcontroller is actually part of an on-board
programmer and debugger named ST-LINK and is connected to the USB port named "USB ST-LINK".
For a more detailed features list and further specification of the board take a look at [STMicroelectronics](https://www.st.com/en/evaluation-tools/stm32f3discovery.html) website.

- There's a second USB port, labeled "USB USER" that is connected to the main microcontroller, the
STM32F303VCT6, and can be used in applications.
A word of warning: be careful if you want to apply external signals to the board. The microcontroller STM32F303VCT6 pins take a maximum voltage of 4 volts, but ideally should be driven by the nominal voltage of 3.3 volts. For further information consult the [6.2 Absolute maximum ratings section in the manual](https://www.st.com/resource/en/datasheet/stm32f303vc.pdf)
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I would not mention "4V" (not even sure whether that's a typo or the maximum tolerable regular 3.3V) but instead say the nominal voltage is 3.3V with only a few pins being 5V tolerant.

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I agree with this.