- Libraries: Includes the necessary libraries for the HTS221 sensor and standard C++ algorithms.
- Constants: Defines pin assignments (
sensorPin1
,sensorPin2
,sensorPin3
), LED pin (LED
), and threshold values (HB
,SB
,EP
). - Global Variables: Initializes variables for sensor readings (
v_R1
,v_R2
,v_R3
), thresholds (Th_voltages
,Th_voltage
), and communication parameters.
- Begins serial communication and initializes the HTS221 temperature and humidity sensor.
- Halts program execution with an error message if sensor initialization fails.
- Calls
DiversityGainEngineInit()
repeatedly to initiate the diversity gain engine process.
- Iterates through a loop (
BITLENGTH
times) to read sensor values (v_R1
,v_R2
,v_R3
) and estimate threshold voltages (Th_voltages
) usingThresholdVoltageEstimator()
. - Calculates an average threshold voltage (
Th_voltage
) from the collected data. - Calls
CombiningTEchniqueSelection()
to determine and execute a combining technique (EGC
,MLC
, orSC
) based on the highest detected signal strength.
- Determines the maximum value among three sensor readings (
v1
,v2
,v3
) to estimate the threshold voltage.
- Evaluates the effectiveness of different combining techniques (
EGC
,MLC
,SC
) based on sensor readings. - Selects the technique with the highest signal strength (
CT_ID_EGC
,CT_ID_MLC
,CT_ID_SC
) and calls the corresponding function (EGC_machine()
,MLC_machine()
,SC_machine()
).
- EGC Machine (
EGC_machine()
): Implements error correction and detection using the EGC (Exclusive-OR Gate Combination) technique. - MLC Machine (
MLC_machine()
): Implements majority logic combining technique. - SC Machine (
SC_machine()
): Implements selection combining technique. - Data Processing: Each machine function processes sensor data to determine communication modes and handles data transmission.
- Write Byte (
writeByte()
): Converts a decimal value to binary and sends it bit-by-bit to output pins. - Pulse Mapping (
PulseMapping()
): Controls LED to indicate data transmission status based on temperature data.
- EGC_Engine(), MLC_Engine(), SC_Engine(): Functions implementing respective combining techniques with different bit processing logic.
inRange()
: Checks if a value falls within a specified range.
- The sketch is designed for sensor data processing, employing various combining techniques for robust communication.
- It likely serves as part of a larger system for data transmission or control in an embedded environment like Arduino.
- Modifications can be made to tailor the code to specific application requirements.
- Application Context: Designed for robust sensor data processing and communication in an Arduino, stm32 or any other environment.
- Functionality: Implements diverse combining techniques (EGC, MLC, SC) to ensure reliable data transmission or control.
- Feedback: Provides visual feedback through an LED to indicate transmission status based on temperature data.
This code implements a sophisticated signal processing system on an STM32 microcontroller, designed to optimize signal reception and communication through advanced combining techniques.
void SystemInit() {
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_ADC1_Init();
MX_USART2_UART_Init();
}
Key Actions:
- Initialize Hardware Abstraction Layer (HAL)
- Configure system clock
- Set up GPIO pins
- Initialize Analog-to-Digital Converter (ADC)
- Configure UART communication
static void MX_ADC1_Init(void) {
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.NbrOfConversion = 3;
// Additional configuration parameters
}
Configuration Details:
- 12-bit resolution for precise measurements
- 3 channels for multi-sensor input
- Non-continuous conversion mode
- Configures clock prescaler and data alignment
uint16_t ThresholdVoltageEstimator(uint16_t v1, uint16_t v2, uint16_t v3) {
return std::max({v1, v2, v3});
}
Purpose:
- Selects the maximum voltage from three sensor inputs
- Determines signal strength and quality
- Provides a basis for subsequent processing
void DiversityGainEngineInit() {
for(int j = 0; j < BITLENGTH; j++) {
// Trigger ADC conversions
// Calculate threshold voltages
}
// Compute average threshold voltage
Th_voltage = (/* sum of threshold voltages */) / 8;
CombiningTechniqueSelection();
}
Main Responsibilities:
- Perform multiple ADC conversions
- Calculate threshold voltages for different bit lengths
- Compute average threshold voltage
- Initiate combining technique selection
void CombiningTechniqueSelection() {
for (uint8_t j = 0; j < BITLENGTH; j++) {
CT_ID_EGC = EGC_Engine(v_R1, v_R2, v_R3, HIGH, j);
CT_ID_MLC = MLC_Engine(v_R1, v_R2, v_R3, HIGH, j);
CT_ID_SC = SC_Engine(v_R1, v_R2, v_R3, j);
}
}
Combining Techniques:
- EGC (Equal Gain Combining)
- MLC (Maximum Likelihood Combining)
- SC (Selection Combining)
void writeByte(char decimal) {
for(int i = 0; i < BITLENGTH; i++) {
// Convert decimal to binary
// Transmit bits via GPIO
}
}
Transmission Process:
- Convert decimal to binary representation
- Use GPIO pins to represent binary states
- Implement bit-level transmission
int main(void) {
SystemInit();
while(1) {
DiversityGainEngineInit();
HAL_Delay(500);
}
}
Operation Flow:
- Continuous initialization of Diversity Gain Engine
- 500ms delay between iterations
- Wireless communication systems
- Signal processing in noisy environments
- Adaptive sensor fusion
- Advanced communication protocols
- Placeholder implementations for some engine functions
- Requires specific STM32 hardware configuration
- Needs customization for specific use cases
The code represents a complex signal processing approach, leveraging multiple sensors and advanced combining techniques to potentially improve communication reliability and performance.