Regular motor, driver and tiva c

Ferz

Other Parts Discussed in Thread: SN754410

Hi,

I was working on project to control the the speed of motor using PWM . I use SN754410 bridge for my motor driver. I set up PWM for my motor in my code. But the code that I write does not run my motor. Below here is my code:

#define PWM_FREQUENCY 55

int main(void)
{
volatile uint32_t ui32Load;
volatile uint32_t ui32PWMClock;
volatile uint8_t ui8Adjust=100;
ROM_SysCtlClockSet( SYSCTL_SYSDIV_16 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ | SYSCTL_OSC_MAIN);
ROM_SysCtlPWMClockSet(SYSCTL_PWMDIV_64);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM0);

ROM_GPIOPinTypePWM(GPIO_PORTB_BASE, GPIO_PIN_4|GPIO_PIN_5);
ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);

ROM_GPIOPinConfigure(GPIO_PB4_M0PWM2);
ROM_GPIOPinConfigure(GPIO_PB5_M0PWM3);

HWREG(GPIO_PORTF_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY;
HWREG(GPIO_PORTF_BASE + GPIO_O_CR) |= 0x01;
HWREG(GPIO_PORTF_BASE + GPIO_O_LOCK) = 0;
ROM_GPIODirModeSet(GPIO_PORTF_BASE, GPIO_PIN_4|GPIO_PIN_0, GPIO_DIR_MODE_IN);
ROM_GPIOPadConfigSet(GPIO_PORTF_BASE, GPIO_PIN_4|GPIO_PIN_0, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);

ui32PWMClock = SysCtlClockGet() / 64;
ui32Load = (ui32PWMClock / PWM_FREQUENCY) - 1;

PWMGenConfigure(PWM0_BASE, PWM_GEN_1, PWM_GEN_MODE_UP_DOWN);
PWMGenConfigure(PWM0_BASE, PWM_GEN_3, PWM_GEN_MODE_UP_DOWN);

PWMGenPeriodSet(PWM0_BASE, PWM_GEN_1, ui32Load);
PWMGenPeriodSet(PWM0_BASE, PWM_GEN_3, ui32Load);
ROM_PWMOutputState(PWM0_BASE, PWM_OUT_2_BIT|PWM_OUT_3_BIT, true);
ROM_PWMGenEnable(PWM0_BASE, PWM_GEN_1);
ROM_PWMGenEnable(PWM0_BASE, PWM_GEN_3);

while(1)
{
if(ROM_GPIOPinRead(GPIO_PORTF_BASE,GPIO_PIN_4)==0x00)
{
ROM_PWMPulseWidthSet(PWM0_BASE, PWM_OUT_2, ui32Load / 1000);
ROM_PWMPulseWidthSet(PWM0_BASE, PWM_OUT_3, 0);
}

}
}

Thanks,

Fer

over 9 years ago

0 Amit Ashara over 9 years ago

TI__Guru**** 244400 points

Hello Ferz

Which type of motor are you using?

Regards
Amit

0 Robert Adsett over 9 years ago in reply to Amit Ashara

Guru 27665 points

Also,
are you getting a pwm output from the micro?
From the bridge?
How is the bridge connected to the PWM?

Robert

0 Ferz over 9 years ago in reply to Amit Ashara

Intellectual 260 points

Hi Amit,

I am using DC motor.

0 Robert Adsett over 9 years ago in reply to Ferz

Guru 27665 points

I know that sounds like an answer but it is not. There are many types of DC motors and some AC motors are called DC motors.

Robert

0 Ferz over 9 years ago in reply to Robert Adsett

Intellectual 260 points

Hi Robert,

I am getting PWM out from microcontroller to bridge to control the motor rotation. From the driver there is 2 pins to the motor and 2 pins to get data from microcontroller.

0 Ferz over 9 years ago in reply to Robert Adsett

Intellectual 260 points

So this motor called Regular Motor 2. Here is the website for the motor. solarbotics.com/.../

Fer

0 Amit Ashara over 9 years ago in reply to Ferz

TI__Guru**** 244400 points

Hello Ferz

Great, but there is no data sheet link, only mechanical drawings.

Regards
Amit

0 cb1_mobile over 9 years ago in reply to Amit Ashara

Guru 117855 points

Clearly - as this thread proves - there is NO need (whatsoever) for, "Poster Guidance."

Might the, "worst wounds" be "self-inflicted" ones?

0 Robert Adsett over 9 years ago in reply to Ferz

Guru 27665 points

Ferz said:
I am getting PWM out from microcontroller to bridge to control the motor rotation.

How do you know?

Ferz said:
From the driver there is 2 pins to the motor and 2 pins to get data from microcontroller.

That is terse to the point it means nothing.

It suggests you've only connected 4 pins.

Robert

0 Robert Adsett over 9 years ago in reply to Amit Ashara

Guru 27665 points

I'd venture from that drawing that the motor is probably not AC or switched reluctance. There are still several types it could be although one is more likely given its size and the fact it is two terminal.

It's low current which is good, low voltage which is less so.

Still need more information.

Robert

0 cb1_mobile over 9 years ago in reply to Robert Adsett

Guru 117855 points

Picky, picky Robert.

Vendor surely believes that posters are technically skilled, caring & devote great time/effort to their postings... (or not...)

0 Ferz over 9 years ago in reply to Amit Ashara

Intellectual 260 points

Hi Amit,

Sorry that one was wrong motor. Here the motor that I use FA-130RA-18100 and here is the link :
www.alibaba.com/.../FA-130-1-5v-3v-low_60203295270.html

But only electrical specification shown in the data sheet.

0 Robert Adsett over 9 years ago in reply to Ferz

Guru 27665 points

OK, it's a small DC brushed PM motor.

The earlier questions about PWM and connections still stands. What does your oscilloscope show?

Second does the motor move when you apply 3V across it?

Third how do you handle regenerative voltages?

Robert

0 Amit Ashara over 9 years ago in reply to Ferz

TI__Guru**** 244400 points

Hello Ferz,

PWM_OUT_2 and PWM_OUT_3 belong to PWM_GEN_1. So the 2nd line in the below code does not do anything.

PWMGenPeriodSet(PWM0_BASE, PWM_GEN_1, ui32Load);
PWMGenPeriodSet(PWM0_BASE, PWM_GEN_3, ui32Load);
ROM_PWMOutputState(PWM0_BASE, PWM_OUT_2_BIT|PWM_OUT_3_BIT, true);

As Robert mentioned, did you check the PWM output?

Regards
Amit

0 Ferz over 9 years ago in reply to Amit Ashara

Intellectual 260 points

Hello Amit and Robert,

I have checked the motor and it runs with 3 V. I have checked the PWM output and there is a signal of PWM. But now I have problem the output from the driver does not have enough voltage to turn on the motor.

0 Amit Ashara over 9 years ago in reply to Ferz

TI__Guru**** 244400 points

Hello Ferz,

Without a data sheet for the motor I am at a loss to provide an input. Why? because I may not even be close to the drive requirements that would be expected by the motor.

Regards
Amit

0 Robert Adsett over 9 years ago in reply to Ferz

Guru 27665 points

Ferz said:
I have checked the PWM output and there is a signal of PWM

How? And where?

Robert

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Regular motor, driver and tiva c