Hi All, IE9 doesnt like this site on my computer so here goes again....
I am using a dev platform TDM3730 based on a DM3730 and have got a little stuck with GPIO and kernel inetrrupts. I am not new to the world of embedded platforms so have a good understanding about how ucontrollers are setup and used. The issue I am having is I can only get a maximum intterupt duty cycle of ~10ms. On an 800MHz platform I find this hard to believe and I need to get the speed down to 1ms for my project to start working properly.
I would like someone who has a beagleboard and possibly a sig-gen to try a test for me please ? I have written a simple kernel driver that services the interrupt request on GPIO_170 and prints out an interrupt count on the console, serviced in ~30us (as scoped). I am happy to supply the code to anyone who is willing to try the test.
I have checked all the pin mux registers that I can see for the GPIO_170 (bank 6) and it is set as input enable, pullup/down disabled, mode 4 and in the IRQ setup it is set to Falling Edge Detect.
Is there any known reason why I cannot get better than 10ms on GPIO_170 ? Or should I be using a different GPIO pin ?
Any knowledge help is greatly appreciated an may result in beer tokens ;)
Can you cross-verify what timers are being used on the Beagleboard?. Try enabling the High Resolution Timers, which may improve the resolution on handling events.
what happened there ???
Hi All,
IE9 doesnt like this site on my computer so here goes again....
I am using a dev platform TDM3730 based on a DM3730 and have got a little stuck with GPIO and kernel inetrrupts. I am not new to the world of embedded platforms so have a good understanding about how ucontrollers are setup and used. The issue I am having is I can only get a maximum intterupt duty cycle of ~10ms. On an 800MHz platform I find this hard to believe and I need to get the speed down to 1ms for my project to start working properly.
I would like someone who has a beagleboard and possibly a sig-gen to try a test for me please ?
I have written a simple kernel driver that services the interrupt request on GPIO_170 and prints out an interrupt count on the console, serviced in ~30us (as scoped). I am happy to supply the code to anyone who is willing to try the test.
I have checked all the pin mux registers that I can see for the GPIO_170 (bank 6) and it is set as input enable, pullup/down disabled, mode 4 and in the IRQ setup it is set to Falling Edge Detect.
Is there any known reason why I cannot get better than 10ms on GPIO_170 ? Or should I be using a different GPIO pin ?
Any knowledge help is greatly appreciated an may result in beer tokens ;)
Thanks
Marc
Can you cross-verify what
Can you cross-verify what timers are being used on the Beagleboard?. Try enabling the High Resolution Timers, which may improve the resolution on handling events.