基于AVR单片机的MPPT控制C程序

#include "16F877.h" #device ADC = 8 // 一个8位寄存器ADC模式 #fuses HS, NOWDT, PUT, NOPROTECT, BROWNOUT, NODEBUG, NOLVP // High-Speed 20MHz, No Watchdog, No Protection, Brownout Protection, #use delay(clock=20000000) // 20MHz Crystal //int is defined as 8-bit unsigned integer using CCS compiler void main (void) { signed int direction; int delta; int pwm; int upperbound; int lowerbound; float power; float powerold; float voltage; float voltagedrop; float voltagedifference; float currentma; float measuredvoltage; float measuredvoltagedrop; direction = 1; // Set initial direction to positive delta = 1; // Amount by which to adjust the PWM - 7-bit resolution so duty step of 2% pwm = 26; // Initial position of the PWM - 50% Duty Cycle with 7-bit resolution. upperbound = 49; // Upper bound of the PWM % lowerbound = 1; // Lower bound of the PWM % power = 0; // Initial Value of Power setup_adc(ADC_CLOCK_DIV_32); // ADC clock setup_adc_ports(ALL_ANALOG); // Set all inputs to analog output_low(PIN_C1); // Set CCP1 output low setup_ccp1(ccp_pwm); // setup pin CCP1 (RC2) to do PWM setup_timer_2(T2_DIV_BY_1,12,1); // 384.615kHz while (1) { //delay_ms(1000) // Wait 1 Second set_adc_channel(0); // Select RA0 //delay_ms(20); // Wait to Read ADC measuredvoltage = read_adc(); // Read the voltage input from ADC channel 0 set_adc_channel(1); // Select RA1 //delay_ms(20); // Wait to Read ADC measuredvoltagedrop = read_adc(); // Read the Voltage dropped across the R from ADC channel 1 voltage = measuredvoltage/51; // Measured Voltage is 51 steps per Volt at a Reference Voltage of 5V voltagedrop = measuredvoltagedrop/51; voltagedifference = voltage - voltagedrop; currentma = voltagedifference; // Calculating Current using 1K Resistance powerold = power; // Calculate the Power from the inputs power = voltage * currentma; pwm = pwm + direction*delta; // Adjust Pulse Width Modulation Value by Delta value if (power < powerold) // If at top of curve, change direction { direction = -direction; continue; } if (pwm > upperbound) // If at maximum PWM, Stop here { pwm = upperbound; continue; } if (pwm < lowerbound) // If at minimum PWM, Stop here { pwm = lowerbound; continue; } set_pwm1_duty(pwm); // Set PWM Mark-Space Radio to approx 50% } }