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| Carambola GPIO https://www.8devices.com/community/viewtopic.php?f=1&t=132 |
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| Author: | bluespray [ 18 Jun 2012, 04:50 ] |
| Post subject: | Carambola GPIO |
I got I2C working. Now, onto GPIO. I'll need 4-5 GPIOs. Lokking at the pinout, the best candidates are those UART1 pins (25-32). What I've gathered from this forum is that only GPIO5 has been successfully working, and you have to use mmio to get it into GPIO mode. My questions are: 1. Has anyone been able to get any other GPIO to work? 2. Is there a list of addresses (for use with mmio) for all of the available GPIOs? |
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| Author: | Saulius [ 18 Jun 2012, 05:56 ] |
| Post subject: | Re: Carambola GPIO |
| Author: | Sprite_tm [ 18 Jun 2012, 09:51 ] |
| Post subject: | Re: Carambola GPIO |
And I can confirm GPIO works just fine: I've been using some from the kernel as an one-wire interface and a GPIO-based SPI port, plus some from software, both as outputs and inputs. Never had problems with it. |
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| Author: | bluespray [ 18 Jun 2012, 14:29 ] |
| Post subject: | Re: Carambola GPIO |
Which GPIO pins were you using? |
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| Author: | Sprite_tm [ 18 Jun 2012, 19:06 ] |
| Post subject: | Re: Carambola GPIO |
I think I mostly used the ones that are shared with serial port 0. |
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| Author: | bluespray [ 19 Jun 2012, 01:04 ] |
| Post subject: | Re: Carambola GPIO |
| Author: | Sprite_tm [ 19 Jun 2012, 14:18 ] |
| Post subject: | Re: Carambola GPIO |
| Author: | bluespray [ 19 Jun 2012, 22:26 ] |
| Post subject: | Re: Carambola GPIO |
Actually, it depends. From the kernel code and datasheet, GPIO 7-14 are shared between PCM, I2S, and UART0. They are reserved when you your kernel is compiled with PCM, I2S, etc. If you look at the file /sys/kernel/debug/gpio, you can see if they're claimed or not. Straight from the default kernel, setting gpioctl on some of these will result in error. Any way, I've found a way to patch the kernel to claim them for my system. It's better for us this way. |
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| Author: | Zodiac69 [ 17 Jul 2012, 09:11 ] |
| Post subject: | Re: Carambola GPIO |
Hi All Not sure if this has been done but, i am looking for a gpio to include a "Rotary Encoder". Did the "Google" thing and found a few but i do not see them as been available in the "Software" section. I am new to Linux and have never compiled a package...but. If someone has a "Virtual Box" file and give me some pointers, i am willing to try. Z69 |
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| Author: | dsuarezv [ 24 Jan 2013, 12:33 ] |
| Post subject: | Re: Carambola GPIO |
This is an old topic, but just in case someone else needs GPIO, I've written a little library that tries to resemble the arduino API for pin handling. It uses the GPIO registers on the RT3052 so it's pretty fast. It's available here: Cheers! |
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