STM32 Development Log 6 : ADC sampling

 

ADC	IC	Channels
ADC1	ADS7606 (U9)	AN0–AN7
ADC2	ADS7606 (U10)	AN8–AN15

All 8 channels on each ADS7606 are sampled simultaneously ADC 1  No MOSI SPI3_CLK SPI3_MISO ADC_CS1 ADC1_CONV_ST ADC1_BUSY ADC1_RESET  ADC 2 No MOSI SPI3_CLK SPI3_MISO ADC_CS2 ADC2_CONV_ST ADC2_BUSY ADC2_RESET  GPIO lines Signal STM32 Pin ADC1_CONV_ST PF15 ADC2_CONV_ST PK7 ADC1_RESET PJ2 ADC2_RESET PK4 ADC1_BUSY PB5 ADC2_BUSY PB6 SPI3_CLK PA7 SPI3_MISO PF11 ADC_CS1 PG15 ADC_CS2 PB8   Low pass filter R = 100 Ω C = 0.1 µF Cutoff: $$f_c=\frac{1}{2\pi RC}$$ $$f_c=\frac{1}{2\pi (100)(0.1\times10^{-6})}$$ $$f_c\approx 15.9\,kHz$$ So the board contains approximately: 16 kHz low-pass anti-alias filter

STM32 Development Log: Timer settings

Always backup main.c before generating code. 

 HCLK = 200 MHz

1. D2PPRE1 = /2, again multiplied by 2 for APB1 Timer Clock , APB1 Timer Clock alone is back to 200
2. APB1 Peripheral Clock = 100 MHz, APB1 Peripheral Clock is not multiplied by 2, it is 100 only
3. APB1 Timer Clock = 200 MHz
4. Prescaler = 199, Counter Clock = 1 MHz, Auto Reload (Period) = 199
5. 200e6/200 prescaler = 1e6, 1e6/200 prescaler = 5000 Hz
6. control loop Period = 200 µs, update Frequency = 5000 Hz
   

 

Enable interrupts from timer 14

 

 Clock configuration

 

 5kHz update in oscilloscope:

 

STM32 Development Log 5: Current consumption

When running the  Switches_LED_Demo program,]

Current consumption increase by 100mA when SW3 is pressed. 

1. When only heart beat LED is running, 0.179 Ampere @12V
2. SW1:With LD5 on 0.187 Ampere = 8 mA increase over case 1
3. SW2:With LD4 on 0.195 Ampere = 8 mA increase over case 2
   
4. SW3:With LD3 on 0.305 Ampere =  110 mA increase over case 3 Why? SW3 switches PI14 and PI15. PI14 is LD3. PI15 is J3 connector, pin 38, switching relay  1. However this cannot add 100mA to the current consumption. 

 

After disable PI15 relay output in software, the current consumption is correct:

When only green heart beat LED is running, 0.175 Ampere @12V

SW1:With LD5 red on 0.184 Ampere = 9 mA increase over case 1

SW2:With LD4 red on 0.192 Ampere = 8 mA increase over case 2

SW3:With LD3 red on 0.193 Ampere = 1 mA increase over case 3 

SW4:With LD2 green on 0.195 Ampere = 2 mA increase over case 4

SW5:With LD1 green on 0.197 Ampere = 2 mA increase over case 5

SW6:With SW_LED green on 0.198 Ampere = 2 mA increase over case 6, in the control module.

if(button3 == 1)

{

if(button3_state == 0)

{

HAL_GPIO_WritePin(GPIOI, GPIO_PIN_14, GPIO_PIN_SET);

button3_state = 1;

// PI 15 is relay 1

// This code is for testing only

// HAL_GPIO_WritePin(GPIOI, GPIO_PIN_15, GPIO_PIN_SET);

}

else

{

HAL_GPIO_WritePin(GPIOI, GPIO_PIN_14, GPIO_PIN_RESET);

button3_state = 0;

// PI 15 is relay 1

// This code is for testing only

// HAL_GPIO_WritePin(GPIOI, GPIO_PIN_15, GPIO_PIN_RESET);

}

button3 = 0 ;

}

 

Comments

1. LD2 , triggered by SW4, PA0 , needs long press for the LED to switch states, it is not interrupt driven, it is polled.
2.  LD1, triggered by SW5, increases current consumption by only 3mA
3. SW_LD10, triggered by SW6,  increases current consumption by only 4mA, SW_LD10 is physically located on the compute module, not on the base board.

STM32 Development Log 4: Heart beat LED

System clock setting:

RCC_OscInitStruct.PLL.PLLM = 4;

RCC_OscInitStruct.PLL.PLLN = 50;

RCC_OscInitStruct.PLL.PLLP = 2;

 

Timer duration set in tim.c

/* USER CODE END TIM13_Init 1 */

htim13.Instance = TIM13;

htim13.Init.Prescaler = 9999;

htim13.Init.CounterMode = TIM_COUNTERMODE_UP;

htim13.Init.Period = 9999;

htim13.Init.ClockDivision = TIM_CLOCKDIVISION_DIV4;

htim13.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

Interrupt Frequency =
TIM13 Clock / ((Prescaler + 1) × (Period + 1))

 PF2 Toggle  code in main.c:

if(htim->Instance == TIM13)

{

if(heart_beat == 0)

{

heart_beat = 1 ;

HAL_GPIO_WritePin(GPIOF, GPIO_PIN_2, GPIO_PIN_SET);

}

else

{

heart_beat = 0 ;

HAL_GPIO_WritePin(GPIOF, GPIO_PIN_2, GPIO_PIN_RESET);

}

} 

 

STM32 Development Log 3: Button details

Button Summary

Button	Net Name	MCU Pin	Input Type	Detection Method	Interrupt Type	Pull-up Type	Pull-up Resistor
SW1	SW_INP1	PF10	Digital Input	EXTI Interrupt	Falling Edge	External	R62 = 10 kΩ
SW2	SW_INP2	PC0	Digital Input	EXTI Interrupt	Falling Edge	External	R61 = 10 kΩ
SW3	SW_INP3	PC1	Digital Input	EXTI Interrupt	Falling Edge	External	R60 = 10 kΩ
SW4	SW_INP4	PA0	Digital Input	TIM7 Polling	None	External	R59 = 10 kΩ
SW5	SW_INP5	PH2	Digital Input	EXTI Interrupt	Falling Edge	External	R57 = 10 kΩ
SW6	SW_INP6	PH3	Digital Input	EXTI Interrupt	Falling Edge	External	R56 = 10 kΩ

Switch Debounce and Protection Components

Button	Series Resistor	Debounce Capacitor	TVS / ESD Protection
SW1	R14 = 100 Ω	C10 = 0.1 µF	VS6
SW2	R15 = 100 Ω	C11 = 0.1 µF	VS7
SW3	R16 = 100 Ω	C12 = 0.1 µF	VS8
SW4	R17 = 100 Ω	C13 = 0.1 µF	VS11
SW5	R18 = 100 Ω	C14 = 0.1 µF	VS9
SW6	R19 = 100 Ω	C15 = 0.1 µF	VS10

Output / LED Summary

Function	MCU Output Pin(s)	GPIO Configuration	Controlled By
Heartbeat LED	PF2	Digital Output (Push-Pull)	TIM13 Interrupt
Output 1	PI12, PB1	Digital Output (Push-Pull)	SW1
Output 2	PI13, PB2	Digital Output (Push-Pull)	SW2
Output 3	PI14, PI15	Digital Output (Push-Pull)	SW3
Output 4	PF4	Digital Output (Push-Pull)	SW4
Output 5	PH5	Digital Output (Push-Pull)	SW5
Output 6	PK2	Digital Output (Push-Pull)	SW6

STM32 Development Log 2: Build fail

 If build fails again with the error:

 

make: *** No rule to make target 'G:/03_NAL/2024_RC_amb/10_controls/STM32Cube/Repository/STM32Cube_FW_H7_V1.12.0/Drivers/STM32H7xx_HAL_Driver/Src/stm32h7xx_hal.c', needed by 'Drivers/STM32H7xx_HAL_Driver/stm32h7xx_hal.o'. Stop.

make: *** Waiting for unfinished jobs....

"make -j4 all" terminated with exit code 2. Build might be incomplete.

16:48:08 Build Failed. 2 errors, 0 warnings. (took 34s.189ms)

 Probably becaluse it is still looking for repository. In properties, delete the linked resources looking for old repository files:

 

STM32 Development Log 1: Internet required 4 times= CubeIDE + CubeMX + Firmware H7 download + STLink upgrage

1.  For STM32 cube IDE version 2.1.1, the stm32cubeMX has to be downloaded separately
2.  stm32cubeMX is required to open ioc file.
3. With  stm32cubeMX and ioc file of the board, the stm32halxx.c and stm32halxx.h files have to be generated.
4. STM32 cube IDE version 2.1.1 will also ask to upgrade the firmware of STLINKV2 . This requires internet. 
5. 
   

Importing project folder from older stm32cube into stm32 2.1.1

1. File>Import>General>Existing projects into workspace>Next>""G:\03_NAL\2024_RC_amb\10_controls\controlPrograms\20260327_baseBoardTestCodes\BASE BOARD TEST CODES\Switches_LED Demo"" . 
2. Ensure the project is ticked in the list below 
3. Ensure "Copy projects into workspace" is ticked. Otherwise the original copy will be edited when i make changes in the ide.
   
4. In the project explorer, right click and refresh, then project>clean, then build project. 
5. Error: 16:15:55 **** Build of configuration Debug for project Switches_LED Demo ****
   make -j4 all
   make: *** No rule to make target 'G:/03_NAL/2024_RC_amb/10_controls/controlPrograms/STM32Cube/Repository/STM32Cube_FW_H7_V1.12.0/Drivers/STM32H7xx_HAL_Driver/Src/stm32h7xx_hal.c', needed by 'Drivers/STM32H7xx_HAL_Driver/stm32h7xx_hal.o'.  Stop.
   "make -j4 all" terminated with exit code 2. Build might be incomplete.
6. The driver c and h files are not in the Drivers  directory at all. 
7. Double click the ioc file in the project explorer. It will launch the stm32cubeMx software separately.  Enable:Copy only the necessary library files Generate peripheral initialization as a pair of '.c/.h' files per peripheral (optional)
   
9. 
   
 
10. Then download the required H7 package. 584 MB, only the firmware packages.  
11.  After generating code, the folder is populated with driver c and h files.
12.