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by rogerjames99
Thu Jan 22, 2015 5:13 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Sharing a DREQ between multiple DMA engines
Replies: 14
Views: 1965

Sharing a DREQ between multiple DMA engines

Hi, I am trying to use RPIO.PWM to generate multiple pwm streams. However as soon as I ask RPIO.PWM to use more than one DMA engine the timing becomes inaccurate. I have posted this problem on the RPIO thread and emailed the author but with no response. I thought I would recast the problem as a gene...
by rogerjames99
Tue Jan 20, 2015 9:50 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: RPIO.PWM: Precise PWM via DMA for servos and more (1µs res)
Replies: 15
Views: 28372

Re: RPIO.PWM: Precise PWM via DMA for servos and more (1µs r

Is the module still under active development? I have tried to use use it and come up against an odd problem when using the If you initialise two DMA channels and then add a pulse to the second channel, the subcyle timing and pulse width on the second channel is double what it should. I have measured...
by rogerjames99
Sun Sep 30, 2012 8:54 am
Forum: Troubleshooting
Topic: pwc driver
Replies: 32
Views: 10513

Re: pwc driver

I did so many tests I got mixed up. The camera does work on the hub. Just not at higher resolution. Looking at the kernel code all the functionality appears to be still there. But the move from v4l1 to v4l2 has pulled access to some functionality up into the v4l2 API and out of the private ioctls. E...
by rogerjames99
Fri Sep 28, 2012 3:25 pm
Forum: Troubleshooting
Topic: pwc driver
Replies: 32
Views: 10513

Re: pwc driver

Hello, I have also been trying to get a modded spc900nc working on rasbian. The only way I have found to get it working is directly plugged into the pi and with the frame size set to minimum (160 x 120). I am driving it via a modded version of the indi_v4l_philips driver (and of course the kernel pw...

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