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| State | Description |
|---|---|
| Neutral | The vehicle is in neutral gear |
| Forward | The vehicle is in forward gear |
| Reverse | The vehicle is in reverse |
Turn Signal State Machine
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On the STM32 is a 12-bit analog-to-digital converter (ADC). The role of an ADC is to take an analog signal as an input and give as output a digital number proportional to the magnitude of the input signal. The following formula can be used to determine the ADC reading:
The ADC on the STM32 has 19 multiplexed channels, with 16 of them being mapped to analog input pins. The 16 external allowing it to read signals from 16 external sources and 3 internal sources. The pin mappings for the STM32 are as follows16 external sources are included below:
| ADC Channel | Pin Name |
|---|---|
| ADC_IN0 | PA0 |
| ADC_IN1 | PA1 |
| ADC_IN2 | PA2 |
| ADC_IN3 | PA3 |
| ADC_IN4 | PA4 |
| ADC_IN5 | PA5 |
| ADC_IN6 | PA6 |
| ADC_IN7 | PA7 |
| ADC_IN8 | PB0 |
| ADC_IN9 | PB1 |
| ADC_IN10 | PC0 |
| ADC_IN11 | PC1 |
| ADC_IN12 | PC2 |
| ADC_IN13 | PC3 |
| ADC_IN14 | PC4 |
| ADC_IN15 | PC5 |
In addition, the ADC has two different modes for converting analog signals:
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Analog-to-digital conversion of the different channels can be performed both single mode, in which the ADC converts all the channels at once in a single sequence of conversions, and continuous mode, where the device automatically restarts the scan after converting all of the different channels. The 12-bit value obtained from the conversion will be stored in the ADC read-only data register (ADC_DR).