DRV2605L: DRV2605L audio to vibe register problems

Cliff, 

Thanks for reaching out. Your question has been received and we will provide the feedback as soon as possible. 

Best,

Hailong

I thought that I may have damaged the INT/TRIG port on the device so I purchased a new one to test with the same results.  If it is helpful I am posting my code as follows:

# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

from board import SCL, SDA
from busio import I2C
from adafruit_bus_device.i2c_device import I2CDevice
from adafruit_register.i2c_struct import UnaryStruct

DEVICE_ADDRESS = 0x5A  # device address of PCA9685 board
A_DEVICE_REGISTER_1 = 0x01  # DRV2605_REG_MODE[2:0] (8.5.8.2.4)
A_DEVICE_REGISTER_2 = 0x1B  # DRV2605_REG_CONTROL1 AC coupled input (8.5.8.2.4)
A_DEVICE_REGISTER_3 = 0x1D  # DRV2605_REG_CONTROL3 N_PWM_ANALOG (8.5.8.2.4)

class DeviceControl:  # pylint: disable-msg=too-few-public-methods
    def __init__(self, i2c):
        self.i2c_device = i2c  # self.i2c_device required by UnaryStruct class

    register1 = UnaryStruct(A_DEVICE_REGISTER_1, "<B")  # 8-bit number
    register2 = UnaryStruct(A_DEVICE_REGISTER_2, "<B")  # 8-bit number
    register3 = UnaryStruct(A_DEVICE_REGISTER_3, "<B")  # 8-bit number

# The follow is for I2C communications
comm_port = I2C(SCL, SDA)
device = I2CDevice(comm_port, DEVICE_ADDRESS)
registers = DeviceControl(device)

# set the bits in the device
registers.register1 = 4
registers.register2 = 1 
registers.register3 = 1


# display the device values for the bits
print("register 1: {}; register 2: {}; register 3: {}"
.format(registers.register1, registers.register2, registers.register3))

Thanks very much once again.

I see. Thanks for providing your code!

Hi Hailoing Chen, thank you!

A brief update on this issue.  With reference to the following, excerpted from the DRV2605L documentation:

8.5.8.2.4 Waveform Playback Using Audio-to-Vibe Mode
To take advantage of the audio-to-vibe feature, connect the DRV2605L device to a line-out source as shown in
Figure 59. The full-scale range of the IN/TRIG pin in the audio-to-vibe mode is 1.8 VPP. A 0.1 μF capacitor is
recommended to AC couple the audio source and the IN/TRIG pin. For sources smaller than 1.8 VPP, the
ATH_MAX_INPUT bit in register 0x13 can scale down the input range.
The device enters audio-to-vibe mode when the MODE[2:0] bit is set to 4 in register 0x01 and when the
AC_COUPLE bit in register 0x1B and the N_PWM_ANALOG bit in register 0x1D are set to 1. See the Register
Map section for details.

I have found that the the DRV2605 will automatically fire the ERM the instant I set the MODE[2:0] register bit to "4" even if the IN/TRIG pin is at ground.  Any other changes to the PWM or AC_COUPLE register have no effect.  Injecting a 1.8Vp-p 1KHz signal at the IN/TRIG pin (with the PWM and AC_COUPLE registers set to 0x01) has no effect, does not change the vibration frequency of the ERM.

I suspect that there is some other toggle that needs to be initiated to set the DRV2605 to "listen" for an audio input signal on the IN/TRIG pin but the document is not clear (to me at least) on what that may be, if in fact, such a setting is necessary.

Again, thanks so much for your patient assistance.

Thanks for the additional info. I will need to talk to our firmware expert and then provide the feedback. Thanks for your patience. 

Hi Hailong Chen, thank you for your time and assistance.  I've been trying to get this to work for a while as this feature is an integral component for a project that I am working on.  Again, thanks!

Cliff, 

Thanks for sending the document via email. To close the issue here. 

Hi Hailong Chen, I've not heard anything from you since sending you my "schematic".  Please let me know if you have anything further for me after speaking with the firmware team.