NXP
MCU Code for FRDMKL25Z which works with Graphical User Interface available on Freescale website to control a brushed DC motor using FRDM-34931S-EVB / FRDM-34931-EVB / FRDM-33931-EVB. The code enables controlling the PWM frequency, duty cycle, enabling/disabling while monitoring status flag pin for undervoltge, short circuit and over-temperature events as well as real time load current for implementing advanced diagnostics.
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Brushed_DC_Motor_Control_MC34931_MC33931
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Freescale
Import the program to your compiler window after logging in and complie to "main.cpp" file to generate the binary file "Brushed_DC_Motor_Control_MC34931_MC33931_KL25Z.bin" which can be flashed into the MBED drive on FRDM-KL25Z after upgrading the firmware.
Revision 1:52d7baa4af71, committed 2015-06-12
- Comitter:
- pnandy
- Date:
- Fri Jun 12 17:52:57 2015 +0000
- Parent:
- 0:f2f48fcea638
- Commit message:
- Brushed DC Motor Control using MC34931/MC33931
Changed in this revision
| main_copy.cpp | Show diff for this revision Revisions of this file |
diff -r f2f48fcea638 -r 52d7baa4af71 main_copy.cpp
--- a/main_copy.cpp Fri Jun 12 17:51:20 2015 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,261 +0,0 @@
-#include "mbed.h"
-#include "USBHID.h"
-
-// We declare a USBHID device.
-// HID In/Out Reports are 64 Bytes long
-// Vendor ID (VID): 0x15A2
-// Product ID (PID): 0x0138
-// Serial Number: 0x0001
-USBHID hid(64, 64, 0x15A2, 0x0138, 0x0001, true);
-
-//Setup Digital Outputs for the LEDs on the FRDM
-//PwmOut red_led(LED1);
-//DigitalOut green_led(LED2);
-//DigitalOut blue_led(LED3);
-
-//Setup PWM and Digital Outputs from FRDM-KL25Z to FRDM-17510
-PwmOut IN1(PTC8); // Pin IN1 input to MC34931 (FRDM PIN Name)
-PwmOut IN2 (PTA5); // Pin IN2 input to MC34931 (FRDM PIN Name)
-DigitalOut EN(PTE0); // Pin EN input to MC34931 (FRDM PIN Name)
-DigitalOut DIS(PTA2); // Pin D1 input to MC34931 (FRDM PIN Name)
-DigitalIn STATUS(PTB3);
-AnalogIn CFB(PTB0);
-//DigitalOut READY(PTC7); // Pin READY input to Motor Control Board (FRDM PIN Name)
-
-//Variables
-int pwm_freq_lo;
-int pwm_freq_hi;
-int frequencyHz = 500;
-int runstop = 0;
-int direction = 1;
-int braking;
-int dutycycle = 75;
-int newDataFlag = 0;
-int status = 0;
-uint16_t CurrFB;
-uint16_t CFBArray[101];
-uint32_t CFBTotal;
-uint16_t CFBAvg;
-uint16_t CFBtemp;
-
-//storage for send and receive data
-HID_REPORT send_report;
-HID_REPORT recv_report;
-
-bool initflag = true;
-
-// USB COMMANDS
-// These are sent from the PC
-#define WRITE_LED 0x20
-#define WRITE_GEN_EN 0x40
-#define WRITE_DUTY_CYCLE 0x50
-#define WRITE_PWM_FREQ 0x60
-#define WRITE_RUN_STOP 0x70
-#define WRITE_DIRECTION 0x71
-#define WRITE_BRAKING 0x90
-#define WRITE_RESET 0xA0
-#define WRITE_D1 0xB1
-#define WRITE_D2_B 0xC1
-
-#define scaleFactor 0.11868
-
-// LOGICAL CONSTANTS
-#define OFF 0x00
-#define ON 0x01
-
-
-int main()
-{
- send_report.length = 64;
- recv_report.length = 64;
-
-
- while(1)
- {
- //try to read a msg
- if(hid.readNB(&recv_report))
- {
- switch(recv_report.data[0]) //byte 0 of recv_report.data is command
- {
-//-----------------------------------------------------------------------------------------------------------------
-// COMMAND PARSER
-//-----------------------------------------------------------------------------------------------------------------
-////////
- case WRITE_LED:
- break;
-////////
-
-////////
- case WRITE_DUTY_CYCLE:
- dutycycle = recv_report.data[1];
- newDataFlag = 1;
- break;
-////////
- case WRITE_PWM_FREQ: //PWM frequency can be larger than 1 byte
- pwm_freq_lo = recv_report.data[1]; //so we have to re-assemble the number
- pwm_freq_hi = recv_report.data[2] * 100;
- frequencyHz = pwm_freq_lo + pwm_freq_hi;
- newDataFlag = 1;
- break;
-////////
- case WRITE_RUN_STOP:
- newDataFlag = 1;
- if(recv_report.data[1] != 0)
- {
- runstop = 1;
- }
- else
- {
- runstop = 0;
- }
- break;
-
-////////
- case WRITE_DIRECTION:
- newDataFlag = 1;
-
- if(recv_report.data[1] != 0)
- {
- direction = 1;
- }
- else
- {
- direction = 0;
- }
- break;
-////////
- case WRITE_BRAKING:
- newDataFlag = 1;
- if(recv_report.data[1] == 1)
- {
- braking = 1;
- }
- else
- {
- braking = 0;
- }
- break;
-////////
- case WRITE_D1:
- newDataFlag = 1;
- if(recv_report.data[1] == 1)
- {
- DIS = 1;
- }
- else
- {
- DIS = 0;
- }
- break;
-////////
- case WRITE_D2_B:
- newDataFlag = 1;
- if(recv_report.data[1] == 1)
- {
- EN = 0;
- }
- else
- {
- EN = 1;
- }
- break;
-
-////////
- default:
- break;
- }// End Switch recv report data[0]
-
-//-----------------------------------------------------------------------------------------------------------------
-// end command parser
-//-----------------------------------------------------------------------------------------------------------------
-
- status = STATUS;
- send_report.data[0] = status; // Echo Command
- send_report.data[1] = recv_report.data[1]; // Echo Subcommand 1
- send_report.data[2] = recv_report.data[2]; // Echo Subcommand 2
- send_report.data[3] = 0x00;
- send_report.data[4] = 0x00;
- send_report.data[5] = 0x00;
- send_report.data[6] = (CFBAvg << 8) >> 8;
- send_report.data[7] = CFBAvg >> 8;
-
- //Send the report
- hid.send(&send_report);
- }// End If(hid.readNB(&recv_report))
-/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-//End of USB message handling
-/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-
- CurrFB = CFB.read_u16();
- CFBArray[0] = CurrFB;
- CFBTotal = 0;
- int i = 0;
- for(i=0; i<100; i++)
- {
- CFBTotal = CFBTotal + CFBArray[i];
- }
- CFBAvg = CFBTotal / 100;
-
- for(i=100; i>=0; i--)
- {
-
- CFBArray[i+1] = CFBArray[i];
- }
-
- if(newDataFlag != 0) //GUI setting changed
- {
- newDataFlag = 0;
- if(runstop != 0) //Running
- {
- if(direction == 0) //reverse
- {
- if(braking == 1) //dynamic
- {
- IN1.period(1/(float)frequencyHz);
- IN1 = (float)dutycycle/100.0;
- IN2 = 1;
- }
- else //coast
- {
- IN1 = 0;
- IN2.period(1/(float)frequencyHz);
- IN2 = (float)dutycycle/100.0;
- }
- }
- else //forward
- {
- if(braking == 1) //dynamic
- {
- IN1 = 1;
- IN2.period(1/(float)frequencyHz);
- IN2 = (float)dutycycle/100.0;
- }
- else //coast
- {
- IN1.period(1/(float)frequencyHz);
- IN1 = (float)dutycycle/100.0;
- IN2 = 0;
- }
- }
- }
- else //Stopped
- {
- if(braking == 1) //braking
- {
- IN1.period(1);
- IN2.period(1);
- IN1.write(1);
- IN2.write(1);
- }
- else //coasting
- {
- IN1.period(1);
- IN2.period(1);
- IN1.write(0);
- IN2.write(0);
-
- }
- }
- }
- }
-}