Chettimada, Vinayak Kariappa
Hi Vikrant,
As i said, there is possible overlap of PPIs with BT Controller. PPI channel 16 and 17 overlap with Code PHY feature in
nRF52840.
I will try to send a PR wherein you could (correctly) disable Coded PHY support in nRF52840 so as to have PPI Channels
from 14 to 19 available for 3 LEDs.
Until then, use 3 LEDs and expect 2nd LED to malfunction.
Again, I will like to iterate that for nRF52840, h/w PWM driver has to be used, feel free to contribute (isn’t it fun
to develop than test ;) )
Regards,
Vinayak
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From: Vikrant More [mailto:vikrant8051@...]
Sent: Thursday, February 08, 2018 9:31 AM
To: Chettimada, Vinayak Kariappa <vinayak.kariappa.chettimada@...>
Subject: Re: [Zephyr-devel] [Zephyr-users] Buggy PWM driver for nRF52
Hi Vinayak,
I also able to generate & vary PWM as you did.
Problem arises when we create two channels from PWM0.
One channel -> LED1
Second Channel -> LED2
When I vary LED1 pulse width, sometimes it affects intensity of LED2
Similarly, when I vary LED2 pulse width it affects intensity of LED1
For details I've attached my main.c. Please have a look.
Use nRF connect to send data
send 0100 (ascii string) -> it is for LED1
send 1100 (ascii string) -> it is for LED2
And you will find what I'm saying.
On Thu, Feb 8, 2018 at 1:37 PM, Chettimada, Vinayak Kariappa <vinayak.kariappa.chettimada@...> wrote:
Hi Vikrant,
I have run the upstream fade_led sample on nrf52840-PDK, I see no regression, the brightness
changes every second (up and then down so on).
I advice you to debug your implementation as I have no visibility to your design.
Regards,
Vinayak
I'm working nRF52840-PDK board.
On Thu, Feb 8, 2018 at 1:21 PM, Chettimada, Vinayak Kariappa <vinayak.kariappa.chettimada@...>
wrote:
Hi Vikrant,
Please try the PWM without the BT Controller included. There could be some PWM regression
due to changes in controller implementation.
That said the nrf5_sw driver is software variant designed for older nRF51 SoCs. For newer
nRF52x series h/w PWM’s should be used.
Nrf5_sw will work provided careful mitigation of used PPI and timers between the driver
and BT controller use.
Which SoC are you using?
Regards,
Vinayak
Hi Marti,
>>Are you using the latest master?
Yes
On Thu, Feb 8, 2018 at 1:23 AM, Marti Bolivar <marti@...> wrote:
Hi Vikrant,
Are you using the latest master?
Three improvements to nRF PWM went in fairly recently:
3f1dbfda1 pwm: nrf5_sw: don't disable timer if another channel is still active
ab399a1cf pwm: nrf5_sw: do not use 'inversed' polarity by default
cec073c35 pwm: nrf5_sw: add support for SYS_LOG
On Wed, Feb 7, 2018 at 1:59 PM, Vikrant More <vikrant8051@...> wrote:
I took reference of $zephy/samples/samples/fade_led project
& add following parameters in my prj.conf
CONFIG_SYS_LOG_PWM_LEVEL=4
Could you please inform me, what I should do besides this ??
On Feb 7, 2018 11:36 PM, "Felipe Neves" <ryukokki.felipe@...> wrote:
Did you configure what pins are associated to pwm duty_cycles on the menuconfig?
Best
Felipe
2018-02-07 10:15 GMT-02:00 Vikrant More <vikrant8051@...>:
I've added following lines in my project main ()
pwm_dev = device_get_binding(PWM_DRIVER);
if (!pwm_dev)
{
printk("Cannot find %s!\n", PWM_DRIVER);
return;
}
while(1)
{
if(pwm_pin_set_usec(pwm_dev, PWM_CHANNEL0, PERIOD, pulse_width0))
{
printk("pwm pin set fails\n");
}
if(pwm_pin_set_usec(pwm_dev, PWM_CHANNEL1, PERIOD, pulse_width1))
{
printk("pwm pin set fails\n");
}
k_sleep(100);
}
And using bluetooth updating value of pulse_width0 & pulse_width1. Those two are defined as global variables.
pulse_width0 --> LED_1 on nrf52840_PDK
pulse_width1 --> LED_2 on nrf52840_PDK
I'm able to update value of both these variables using Bluetooth.
I used printk to check it. My logic is perfect.
But if I vary pulse_width0 then it affects intensity of LED2
& if I vary pulse_width1 then it affects intensity of LED1.
Why ? Is anyone found this BUG ?
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Felipe S. Neves
Embedded software & systems engineer
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