Talking about the positive and reverse rotation and PWM speed regulation based on H-bridge circuitry

Take a H-bridge circuit, control the positive and reverse rotation of the motor, the program is online, the change pin can be used, the circuit and source procedures are as follows: Function: P1.1 button stop, P1.2 left, P1.3 Right Turn, P1.0 speed control #include #define uchar unsigned char #define uint unsigned int SBIT PW1 = P0 ^ 0; SBIT PW2 = P0 ^ 1; / / Controlling two inputs of the motor Sbit accelerate = p1 ^ 0; // speed control button SBIT STOP = P1 ^ 1; // Stop button SBIT LEFT = P1 ^ 2; // Left rotary button SBIT Right = P1 ^ 3; // Right turn button #define right_turn PW1 = 0; PW2 = 1 // Clock-clock rotation #define left_turn PW1 = 1; PW2 = 0 // Reverse rotation #define end_turn pw1 = 1; PW2 = 1 // Stop uint t0 = 25000, t1 = 25000; // initially duty cycle is 50% UINT A = 25000; // Set the timer load initial value 25ms set frequency is 20 Hz Uchar flag = 1; // This flag is used to select different loading initial values Uchar dflag; // left and right rotation mark Uchar count; // Used to mark speed gear Void keyScan (); // Keyboard scan Void delay (uchar z); Void Time_init (); // Timer Initialization Void Adjust_Speed (); // Adjust the speed by adjusting the duty ratio // ***************************************** // void main () { Time_init (); // initialization of timer While (1) { Keyscan (); // Constantly scan the keyboard program to make a corresponding response in time } } // ************************************ // Void Timer0 () Interrupt 1 Using 0 { IF (Flag) { FLAG = 0; END_TURN; A = T0; // T0 size determines low levels of continuation time TH0 = (65536-a) / 256; TL0 = (65536-a)% 256; // Rear load initial value } Else { FLAG = 1; // This logo functions to alternately output high and low level IF (dflag == 0) { Right_Turn; // Right Turn } Else { Left_turn; // Left } A = T1; // T1 size determines high level continuation time TH0 = (65536-a) / 256; TL0 = (65536-a)% 256; // Rear load initial value } } void time_init () { TMOD = 0x01; // Working mode Software start timer Timer function 1 Timer 0 TH0 = (65536-a) / 256; TL0 = (65536-a)% 256; // Loading initial value ET0 = 1; // Turn on the timer interrupt enable EA = 1; // Open the total interrupt Tr0 = 0; } // ************************************** // Void delay (uchar z) // Delayed at 12M Z milliseconds { UINT X, Y; For (x = z; x>0; x -) FOR (Y = 110; Y>0; Y -); } // **************************** // Void keyscan () { IF (STOP == 0) { Tr0 = 0; // Close the timer 0 to stop rotation END_TURN; } IF (left == 0) { Tr0 = 1; DFLAG = 1; // Steering sign set left turn left } IF (right == 0) { Tr0 = 1; DFLAG = 0; // Turning flag reset } IF (accelerate == 0) { DELAY (5); // Delay shaking IF (accelerate == 0) { While (accelerate == 0); // Waiting for loosening COUNT ++; IF (count == 1) { T0 = 20000; T1 = 30000; // Duty cycle is 60% } IF (count == 2) { T0 = 15000; T1 = 35000; // Duty cycle is 70% } IF (count == 3) { T0 = 10000; T1 = 40000; // Duty cycle is 80% } IF (count == 4) { T0 = 5000; T1 = 45000; // Duty cycle is 90% } IF (count == 5) { count = 0; } } } }, Read the full text