This project demonstrates the integration of an STM32 microcontroller with the TC72 digital temperature sensor using the SPI communication protocol. The goal is to configure the STM32 as an SPI master to read accurate temperature data from the TC72 slave device. The process involves initializing the sensor, triggering temperature conversions, and reading the resulting data registers. The read temperature value will be processed and transmitted via UART to a virtual terminal, providing a practical example of SPI master-slave interaction and sensor data handling in embedded systems.
STM32CubeMX Configuration- Create a new STM32F103C6 project.
- Set the system clock to 8 MHz.
- Configure SPI1 in Full-Duplex Master mode.
- SPI Parameter Settings:
- Clock Parameters (Prescaler): Set to generate an SPI clock of approximately 1 MHz.
- Clock Phase (CPHA): 1 Edge
- Clock Polarity (CPOL): Low
- Data Size: 8 bits
- First Bit: MSB First
- GPIO Configuration:
- PA4: Configure as GPIO Output (for Chip Enable/CS).
- PB13 (SCK), PB14 (MISO), PB15 (MOSI): Automatically assigned by SPI1.
- Configure UART1 for debug output.
- Generate the initialization code.
- Open the generated project.
- Create Driver Files: Add tc72.h and tc72.c to the Core/Src folder.
- Implement Core TC72 Functions:
- void TC72_Init(void); // Sets up sensor configuration registers.
- uint8_t TC72_ReadRegister(uint8_t reg); // Reads a value from a sensor register.
- void TC72_WriteRegister(uint8_t reg, uint8_t data); // Writes a value to a sensor register.
- float TC72_ReadTemperature(void); // Reads the temperature data and converts it to Celsius
- Application Logic (main.c):
- Initialize the SPI, GPIO, and UART.
- Call TC72_Init().
- In the main loop, call TC72_ReadTemperature() and transmit the result over UART.
- Add a delay (e.g., HAL_Delay(1000)) to read the temperature every second.
- Build the project.
- Add the STM32F103C6 and TC72 components to the schematic.
- Wiring:
- Connect the STM32 SPI pins (PB13, PB14, PB15) to the corresponding TC72 pins (SCK, SDO, SDI).
- Connect PA4 to the TC72 CE (Chip Enable) pin.
- Connect VCC and GND.
- Connect the STM32 UART TX pin to a Virtual Terminal.
- Add Debugging Tools: Add an SPI Debugger component and connect it to the SPI bus lines to monitor communication.
- Load the compiled .hex file into the MCU.
- Start the simulation and observe the temperature readings on the virtual terminal and the SPI traffic on the debugger.
If you have any questions or suggestions don't hesitate to leave a comment below
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