我目前正在使用C中的微芯片max32板进行项目。我需要一小部分帮助。以下是我正在处理的部分：
if (motor_step == 0){
auto_direction = 1;
}
if (motor_step == step_max){
auto_direction = 0;
}
if(auto_direction == 0){
indexM = indexM + 1;
motor_step++;
}
if(auto_direction == 1) {
indexM = indexM - 1;
motor_step--;
}
基本上我的老师给了我们大部分代码，并告诉我们找出自动扫描部分。如果向下滚动，您将看到我需要输入自己的代码的位置。在项目中，我们控制持有激光指示器的电机。自动扫描基本上应该上下扫描并持续进行。经过16个步骤后，电机应停止并向相反方向移动（+为向上和 - 用于向下）。我遇到的问题是，当我运行代码时，自动扫描不会停止。如果我们运行代码，激光器将继续向上或向下扫描（取决于它最后一次打开时的作用）但是在16步之后不会停止并执行相反的操作。
提前致谢，希望我有点清楚。到最后，您将看到我正在改变的代码。以下是我的代码的其余部分供参考：
// EX03_Starter_StepperMotorControl_REVB
// 10-3-2013
//------------------------------------------------
// Status:
// * REVB Starter Template created
//------------------------------------------------
// Author: Coach
// Target Hardware: Digilent chipKITMax32 board + Basic I/O Board
// Development Platform: mpide-0023-windows-20120903
//---------------------------------------------------
// Objective: Provide control logic for stepper motor control
// *** This code can be adapted for chipKITMax32 or Arduino Nano
// Stepper Motor Control Logic:
// ============================
// Stepper Motor Driver keep track of indexM pointing to stepper Motor Drive Table:
// IndexM D3 D2 D1 D0 Hex Value
// ===== == == == == =========
// 0 0 0 0 1 1
// 1 0 1 0 0 4
// 2 0 0 1 0 2
// 3 1 0 0 0 8
// * Wraps around logic is provided by : indexM = indexM & 3
// * To move clockwise, indexM = indexM + 1
// * To move counter clockwise, indexM = indexM - 1
//----------------------------------------
// I/O Assignments:
// ===============
// SW1: Run (SW1 = 0: Stop / SW1 = 1: Run)
// SW2: Direction (SW2= 0: Clockwise/ SW2 = 1: CounterClockWise)
// SW3: Autoscan (SW3 = 0: Manual / SW3 = 1: Autoscan )
// SW4: Timing Control (SW4 = 0: Development, SW4=1: Real)
// LD1: Run Indicator
// LD2: Direction Indicator
// LD3: spare
// LD4: spare
// Simulation:
// LD5: Motor Coil D0
// LD6: Motor Coil D1
// LD7: Motor Coil D2
// LD8: Motor Coil D3
// Physical Motor Drive:
// MotorCoil_0 : pin0
// MotorCoil_1 : pin1
// MotorCoil_2 : pin2
// MotorCoil_3 : pin3
//------------------------------------------
// Functional requirements:
// =======================
// 0. Reflect SW1,SW2,SW3,SW4 to LD1,LD2,LD3,LD4
// 1. When the system is not running (Run = 0), disable all outputs
// 2. When the system is running (Run = 1), read Direction switch
// 2.1 If Direction ==0, run motor clockwise
// 2.2 If Direction ==1, run motor counter clockwise
// 3. Auto scan feature:(Note: to be designed & coded by you)
// SW3: Autoscan (SW3 = 0: Manual / SW3 = 1: Autoscan )
// When in manual mode, execute function 2.1 & 2.2
// When in autoscan mode: stepper motor moves up 16 steps then moves down 16 steps, repeats continuously
// 4. Timing Control (SW4) input:
// 4.1 When in Development mode (SW4 == 0): motorTime = 500 (ms)
// 4.2 When in Real mode (SW4 == 1): motorTime = 10 (ms)
// =======================================================
// Tasks:
// 0. Review "How Stepper Motor Works" power point
// 1. Read & understand this sample code
// 2. Run & verify that it works as written
// 3. *** Design your Autoscan logic using Flow Chart, review with Coach
// 4. *** Add Code for Your Design prescribed in item 3 above
// 5. Verify your code works as prescribed, troubleshoot & fix it as required
// 6. *** Provide optical report to Coach
// 7. *** Verify at System Bench Test with Laser pointer Assembly
//==========================================================================
// set pin numbers:
const int BTN1 = 4; // the number of the pushbutton pin
const int BTN2 = 78; //***** Note: label on the board is for Uno32, this is MAX32, see MAX32 Reference Manual
const int ledPin = 13; // System Operational LED
const int LD1 = 70; //***** Note: label on the board is for Uno32, this is MAX32, see MAX32 Reference Manual
const int LD2 = 71; // ******** LD pins are corrected here.
const int LD3 = 72;
const int LD4 = 73;
const int LD5 = 74;
const int LD6 = 75;
const int LD7 = 76;
const int LD8 = 77;
const int SW1 = 2;
const int SW2 = 7;
const int SW3 = 8;
const int SW4 = 79; //***** Note: label on the I/O board is 35 for uno32 only
// variables:
int BTN1_state = 0; // variable for reading the pushbutton status
int SW1_state = 0;
int SW2_state = 0;
int SW3_state = 0;
int SW4_state = 0;
int motorTime = 1000; // 1000 ms = 1s
// Initial Stepper Motor Coil pattern
int indexM =0;
int step_max = 16;
int motor_step = 0;
int auto_direction = 0;
void setup() {
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
pinMode(LD1, OUTPUT);
pinMode(LD2, OUTPUT);
pinMode(LD3, OUTPUT);
pinMode(LD4, OUTPUT);
pinMode(LD5, OUTPUT);
pinMode(LD6, OUTPUT);
pinMode(LD7, OUTPUT);
pinMode(LD8, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(BTN1, INPUT);
// initialize switches as inputs:
pinMode(SW1, INPUT);
pinMode(SW2, INPUT);
pinMode(SW3, INPUT);
pinMode(SW4, INPUT);
// Turn OFF all LEDs
digitalWrite(LD1, LOW);
digitalWrite(LD2, LOW);
digitalWrite(LD3, LOW);
digitalWrite(LD4, LOW);
// Initial Stepper Motor Coil pattern
digitalWrite(LD5, LOW);
digitalWrite(LD6, LOW);
digitalWrite(LD7, LOW);
digitalWrite(LD8, LOW);
} // end setup()
void loop(){
// System Operation LED ON:
digitalWrite(ledPin, HIGH);
delay(10); // wait for x ms
//----------------------------------------------
// read switches inputs:
SW1_state = digitalRead(SW1);
SW2_state = digitalRead(SW2);
SW3_state = digitalRead(SW3);
SW4_state = digitalRead(SW4);
// Echo switches to LED Indicators:
if (SW1_state == HIGH) {digitalWrite(LD1, HIGH); }
if (SW1_state == LOW) {digitalWrite(LD1, LOW); }
if (SW2_state == HIGH) {digitalWrite(LD2, HIGH); }
if (SW2_state == LOW) {digitalWrite(LD2, LOW); }
if (SW3_state == HIGH) {digitalWrite(LD3, HIGH); }
if (SW3_state == LOW) {digitalWrite(LD3, LOW); }
if (SW4_state == HIGH) {digitalWrite(LD4, HIGH); }
if (SW4_state == LOW) {digitalWrite(LD4, LOW); }
// Arm Logic:
if (SW1_state == LOW) {
// system NOT running:
digitalWrite(LD5, LOW);
digitalWrite(LD6, LOW);
digitalWrite(LD7, LOW);
digitalWrite(LD8, LOW);
} // end if (SW1_State == LOW)
//==============================
if (SW1_state == HIGH) { // system is running
if (SW3_state == LOW) // manual mode
{
// Direction control:
// 2.1 If Direction ==0, run motor clockwise
if (SW2_state == LOW) {indexM = indexM + 1; }
// 2.2 If Direction ==1, run motor counter clockwise
if (SW2_state == HIGH) {indexM = indexM - 1; }
} // end if (SW3_state == LOW)
if (SW3_state == HIGH) // autoscan mode
{
// *** Add your Autoscan codes here *** <---------This is where my code goes.
} // end if (SW3_state == HIGH)
// Timing Control / Speed select processing:
if (SW4_state == LOW) // Development (slow)
{
motorTime = 500; // unit in ms
}
if (SW4_state == HIGH) // Running real motor (fast)
{
motorTime = 10; // unit in ms
}
//=========== Stepper Motor Driver ========
indexM = indexM & 3; // wraps-around logic
switch (indexM)
{
case 0:
digitalWrite(LD5, HIGH);
digitalWrite(LD6, LOW);
digitalWrite(LD7, LOW);
digitalWrite(LD8, LOW);
break;
case 1:
digitalWrite(LD5, LOW);
digitalWrite(LD6, LOW);
digitalWrite(LD7, HIGH);
digitalWrite(LD8, LOW);
break;
case 2:
digitalWrite(LD5, LOW);
digitalWrite(LD6, HIGH);
digitalWrite(LD7, LOW);
digitalWrite(LD8, LOW);
break;
case 3:
digitalWrite(LD5, LOW);
digitalWrite(LD6, LOW);
digitalWrite(LD7, LOW);
digitalWrite(LD8, HIGH);
break;
} // End Switch (indexM)
} // end if (SW1_state == HIGH)
//------------------------------------
// System Operation LED OFF:
digitalWrite(ledPin, LOW);
delay(motorTime); // wait for motorTime ms
} // end loop
//=============================
到目前为止，这是我提出的：
答案 0 :(得分：0)
问题在于最后2个if语句; if (auto_direction = 0)和if (auto_direction = 1)会将auto_direction设置为0或1，而不是与之进行比较。您需要使用==，就像在前两个if声明中一样。