NXP
DC motor driver for FRDM-33879A-EVB (MC33879A). See application note AN5221 at www.nxp.com for more information.
Dependencies: mbed
Fork of
FRDM-33879A-EVB_Brushed_DC_Motor_Control
by 
Freescale
The sample code provided is described in NXP's application note AN5221 found at http://www.nxp.com/products/power-management/engine-and-dc-motor-control/h-bridges/evaluation-kit-33879configurable-octal-serial-switch:FRDM-33879A-EVB. It drives a DC motor using a configurable switch.
DC MOTOR DRIVER
-> 1 second full on forward, 1 second full on backward
-> 3 seconds PWMing forward, 3 seconds PWMing backward
-> green LED indicates forward direction
-> red LED indicates backward direction
main.cpp
- Committer:
- mareikeFSL
- Date:
- 2015-12-14
- Revision:
- 0:bf2ba94eb7e0
File content as of revision 0:bf2ba94eb7e0:
/*------------------------------------------------------------------------------------*/
/* DC motor driver for FRDM-33879A-EVB (MC33879A) */
/* See application note AN5221 at www.nxp.com for more information */
/*------------------------------------------------------------------------------------*/
/*--COMPANY-----AUTHOR------DATE------------REVISION----NOTES-------------------------*/
/* NXP mareikeFSL 2015.12.14 rev 1.0 initial */
/* */
/*------------------------------------------------------------------------------------*/
/* DC MOTOR DRIVER */
/* -> 1 second full on forward, 1 second full on backward */
/* -> 3 seconds PWMing forward, 3 seconds PWMing backward */
/* -> green LED indicates forward direction */
/* -> red LED indicates backward direction */
/*------------------------------------------------------------------------------------*/
/*--SPI-------------------------------------------------------------------------------*/
/* CLK (CLK) = PTD1 (J2/12) */
/* MOSI (MOSI) = PTD2 (J2/8) */
/* MISO (MISO) = PTD3 (J2/10) */
/*------------------------------------------------------------------------------------*/
/*--GPIO------------------------------------------------------------------------------*/
/* CS (CS) = PTD0 (J2/6) */
/* IO12 (EN) = PTA1 (J1/2) */
/*------------------------------------------------------------------------------------*/
/*--PWM-------------------------------------------------------------------------------*/
/* PWM0 (IN5) = PTA12 (J1/8) */
/* PWM1 (IN6) = PTA5 (J1/12) */
/*------------------------------------------------------------------------------------*/
/*--INCLUDES--------------------------------------------------------------------------*/
#include "mbed.h"
/*--DEFINES---------------------------------------------------------------------------*/
/*--INITS-----------------------------------------------------------------------------*/
SPI spi(PTD2, PTD3, PTD1); //mosi, miso, clk
DigitalOut cs(PTD0); //cs
DigitalOut en(PTA1); //en
PwmOut in5(PTA12); //in5
PwmOut in6(PTA5); //in6
DigitalOut cw(LED_GREEN); //forward LED
DigitalOut ccw(LED_RED); //backward LED
/*--CONSTANTS-------------------------------------------------------------------------*/
unsigned const ON1 = 0x01;
unsigned const ON2 = 0x02;
unsigned const ON3 = 0x04;
unsigned const ON4 = 0x08;
unsigned const ON5 = 0x10;
unsigned const ON6 = 0x20;
unsigned const ON7 = 0x40;
unsigned const ON8 = 0x80;
unsigned const ALL_OFF = 0x00;
/*--VARIABLES-------------------------------------------------------------------------*/
/*--FUNCTION DECLARATIONS-------------------------------------------------------------*/
void init_spi(void); //initializes SPI
void send_spi(unsigned const word); //sends SPI commands
int main(void); //main
/*--FUNCTION DEFINITIONS--------------------------------------------------------------*/
/***************************************************************************INIT_SPI***/
void init_spi(void)
{
spi.format(8,1); //8-bit transfer, mode 1 (POL 0, PHA 1)
spi.frequency(4000000); //freq
} //end init_spi()
/***************************************************************************SEND_SPI***/
void send_spi(unsigned const word)
{
cs = 0; //set cs low
spi.write(0x00); //send 0x00
spi.write(word); //send 0xXX
cs = 1; //set cs high
} //end send_spi()
/*******************************************************************************MAIN***/
int main(void)
{
cw = 1; //turn off green LED
ccw = 1; //turn off red LED
cs = 1; //set cs high
init_spi(); //initialize SPI
in5 = 0; //set in5 PWM low
in6 = 0; //set in6 PWM low
en = 1; //set en high (enable device)
while(true)
{
//SPI only
cw = 0; //turn on green LED
ccw = 1; //turn off red LED
send_spi(ON5 | ON7); //5 and 7 ON (forward)
wait_ms(1000); //wait 1 second
cw = 1; //turn off green LED
ccw = 0; //turn on red LED
send_spi(ON6 | ON8); //6 and 8 ON (backward)
wait_ms(1000); //wait 1 second
//SPI with PWMing
cw = 0; //turn on green LED
ccw = 1; //turn off red LED
in5.period_us(100); //set period for 5
in5.write(0.5); //set duty cycle for 5
send_spi(ON7); //7 ON
wait_ms(3000); //wait 3 seconds
in5.write(0); //set duty cycle for 5 (OFF)
send_spi(ALL_OFF); //turn all outputs off
cw = 1; //turn off green LED
ccw = 0; //turn on red LED
in6.period_us(100); //set period for 6
in6.write(0.5); //set duty cycle for 6
send_spi(ON8); //8 ON
wait_ms(3000); //wait 3 seconds
in6.write(0); //set duty cycle for 6 (OFF)
send_spi(ALL_OFF); //turn all outputs off
} //end while()
} //end main()