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Getting started with firmware development for stm32-pi_full

1. Blink

1. Start STM32CubeMX (v4.2.7)

2. Create new project

3. Select STM32F303VETx LQFP100

4. LED's are connected to PD8, PD9 & PD10, select these pins in the pinout view and set to GPIO_Output

5. Open project settings. Name project. Select Makefile for Toolchain / IDE. On the Code Generator page: Copy only necessary, Generate peripheral initialisation, set all free pins as analog.

6. Save and Generate Code.

7. Add to Src/main.c:

/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
  HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_8);
  HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_9);
  HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_10);
  HAL_Delay(200);
/* USER CODE END WHILE */

/* USER CODE BEGIN 3 */

}
/* USER CODE END 3 */
  1. Compile and Upload

2. Serial Output

Follow guide here: https://github.com/openenergymonitor/STM32/blob/master/docs/Serial.md

But enable USART1 RX and TX pins on PA10 and PA9 in the CubeMX pinout view rather than USART2.

3. Analog Read

Follow guide here: https://github.com/openenergymonitor/STM32/blob/master/docs/Analog.md

Analog inputs on STM32-pi full:

  • VT1: PA0 ADC1
  • VT2: PA1
  • VT3: PF4
  • CT1 -> CT9 BRD: PE13
  • CT2 -> CT8 BRD: PE12
  • CT3 -> CT7 BRD: PE11
  • CT4 -> CT6 BRD: PE10
  • CT5 -> CT5 BRD: PE9
  • CT6 -> CT4 BRD: PE8
  • CT7 -> CT3 BRD: PE7 ADC3_IN13
  • CT8 -> CT2 BRD: PB1 ADC3_IN1
  • CT9 -> CT1 BRD: PB0 ADC3_IN12

Add single-ended input on ADC1 PA0 corresponding to VT1. In the ADC1 Configuration tab set Rank > Sampling Time to 601.5 cycles. Generate Code. Add analog read function and print result following guide above.

4. Emon3CT_VET

3CT and ACAC firmware example for the STM32-pi board v0.7

pinout.png

  • Using VT1: PA0 and CT1,2 & 3 which are atually inverted on the schematic so CT7:PE7 CT8:PB1 CT9:PB0.
  • ADC and DMA configuration as given in original Emon3CT example
  • Opamp follower for BIAS: OPAMP4_VINP: PD11, OPAMP4_VOUT: PB12
  • Timer8 configuration

See firmware Emon3CT_VET