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William Miceli
2020-08-22 20:02:11 -04:00
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# LED Face Mask
Yep, it's gonna be awesome!
# Configuration
* Hardware:
* STM32F429I-DISC1 Board
* Contains STM32F429ZIT MCU
* 8 x 8 WS2812B LED Array
* Software:
* The WS2812B Datasheet says it uses "NZR" communication for data, which, I have no idea what that is and DuckDuckGo can't find anything on it
* Using SPI in order to send the data fast enough
* SPI Setup:
* Mode: Transmit Only Master
* Data size of 8 bits
* Most Significant Bit (MSB) first, as that would be the most straightforward
* Rate of 2.5 Mbit/sec, as that would allow for 400 nanosecond pulse widths
* Clock Polarity: Don't Care
* Clock Phase: Don't Care
* Will NOT be using the SPI Clock signal, as the WS2812B LEDs do not need it
* Global Interrupt: Enabled
* For switching LED designs:
* Using TIM6 as a "cooldown" to not have it switch the design hundreds of times on a single button-press
* While in "cooldown" state, LEDs will be off, to signify that the button press has been received and the LED design will be changed
* TIM6 is using APB1, which the timer clocks are set at 80 MHz
* "Cooldown" time of 0.5 seconds is desired:
* 80000000 Hz * 0.5 seconds = 40000000 clock cycles
* TIM6 Configuration:
* One Pulse Mode: Enabled
* Prescaler: 4000
* Counter Mode: Up
* Counter Period: 10000
* Auto-Reload Preload: Enabled
* Trigger Event Selection: Reset (UG bit from TIMx_EGR)
* Global Interrupt: Enabled
# Resources/Credits