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STM32 F4 Family
Manuel Bl edited this page Apr 25, 2023
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The STM32 F4 family includes popular MCUs like the STM32F401CC found on the popular Black Pill board.
- STM32F401CC (used on Black Pill boards)
- For both monitor and sink mode, an additional comparator is needed to level shift and combine the CC1 and CC2 signals.
- For transmission in sink mode, multiple resistors are needed.
| STM32 Pin | Board Label | Signal | Monitor | Sink | Peripheral |
|---|---|---|---|---|---|
| PA1 | A1 | CC_3V3 | X | X | Timer 2, channel 2, input capture EXTI interrupt |
| PA3 | A3 | CC1 | X | X | ADC1, channel 1 |
| PA2 | A2 | CC2 | X | X | ADC1, channel 0 |
| PA7 | A7 | CC1_TX | X | SPI1 MOSI | |
| PA6 | A6 | CC1_TX_EN | X | GPIO output | |
| PB5 | B5 | CC2_TX | X | SPI1 MOSI | |
| PB4 | B4 | CC2_TX_EN | X | GPIO output | |
| PB3 | B3 | DEBUG | (X) | (X) | Optional. GPIO output for debugging |
The below peripherals are used exclusively by this USB PD library. They cannot be used – directly, or indirectly – by other code without interfering with the library operation.
As the only ADC is used by the library, analogRead() is no longer available.
Furthermore, SPI1 is not available if the library is run in power sink mode. If SPI communication is needed, use another SPI peripheral and its associated pins.
| Peripheral | Monitor | Sink | Usage |
|---|---|---|---|
| TIM3 | X | X | Timer for scheduling tasks |
| TIM2 | X | X | Timer for CC1/CC2 input capture (channel 2) and triggering the ADC (channel 3) |
| EXTI pin 1 | X | X | External interrupt |
| DMA1 stream 6 | X | X | DMA to save captured counter values into memory |
| ADC1 | X | X | ADC to monitor to CC1 and CC2 voltage (channel 2 and 3) |
| SPI1 | X | SPI for transmitting messages | |
| DMA2 stream 3 | X | DMA channel for SPI transmission |