Lab0x03_DRV8847.DRV8847 Class Reference

A motor driver class for the DRV8847 from TI. More...

Public Member Functions
def	__init__ (self, timerPin, sleepPin, faultPin)
	Initializes and returns a DRV8847 object. More...
def	enable (self)
	Brings the DRV8847 out of sleep mode. More...
def	disable (self)
	Puts the DRV8847 in sleep mode. More...
def	fault_cb (self, IRQ_src)
	Callback function to run on fault condition. More...
def	motor (self, PWM_tim, IN1_pin, IN2_pin, chA, chB)
	Creates a DC motor object connected to the DRV8847. More...

Public Attributes
	tim
	nSLEEP
	nFAULT
	faultInt
	faultStatus

Detailed Description

A motor driver class for the DRV8847 from TI.

Objects of this class can be used to configure the DRV8847 motor driver and to create one or more objects of the Motor class which can be used to perform motor control. Refer to the DRV8847 datasheet here: https://www.ti.com/lit/ds/symlink/drv8847.pdf

Constructor & Destructor Documentation

__init__()

def Lab0x03_DRV8847.DRV8847.__init__	(		self,
			timerPin,
			sleepPin,
			faultPin
	)

Initializes and returns a DRV8847 object.

Upon calling the DRV8847 class, the init method will instantiate a motor driver object with the timerPin, sleepPin, and faultPin pins passed in by the user.

Member Function Documentation

disable()

def Lab0x03_DRV8847.DRV8847.disable

(

self

)

Puts the DRV8847 in sleep mode.

The disable method will disable all motors controlled by the motor driver class by setting the nSLEEP pin to low.

enable()

def Lab0x03_DRV8847.DRV8847.enable

(

self

)

Brings the DRV8847 out of sleep mode.

The enable method disables the faultInt external interrupt and resets the nSLEEP pin specified upon driver instatiation to 'high' before waiting 50 microseconds to re-enable faultInt in preparation for another potential fault condition occurring. This will allow the user to once again operate the motor driver.

fault_cb()

def Lab0x03_DRV8847.DRV8847.fault_cb	(		self,
			IRQ_src
	)

Callback function to run on fault condition.

Parameters

IRQ_src	The source of the interrupt request.
nFAULT	Fault indication pin. This pin is pulled logic low by a fault condition interrupt request. This open-drain output requires an external pullup resistor. The associated pin is also used as an input pin for the DRV8847S device for releasing the I2C bus.

motor()

def Lab0x03_DRV8847.DRV8847.motor	(		self,
			PWM_tim,
			IN1_pin,
			IN2_pin,
			chA,
			chB
	)

Creates a DC motor object connected to the DRV8847.

Returns

An object of class Motor with the specified: pulse-width modulation timer channel, input 1 and input 2 pins, and channels 1 and 2.

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The documentation for this class was generated from the following file:

• Lab 0x03/Lab0x03_DRV8847.py