2023年6月6日 · What's weird is that having ALT0 as FSEL value 4 to ALT3 as FSEL value 7 initially feels entirely reasonable, but once ALT4 and ALT5 are added, with ALT5 having a lower FSEL value than ALT4, things feel very odd, more confusing than they are.

2024年9月5日 · Hello everyone, i was trying to develop a module that will directly manipulate the SoC registers to achieve some kind of output, for now i was following a tutorial that was using RPI4 and unfortunatly i got some issue.

2024年2月27日 · @aBUGSworstnightmare It would have been considerate to make it clear that "BCM2835_FSEL_ALT0" and "4" are equivalent - you make it appear like a significant change. The problem with using #includes is that dtc doesn't understand them, and even if it did one would have to give it the path to a kernel include tree.

2017年4月26日 · 16.2. The FSEL{n} field determines the functionality of the nth GPIO pin. All unused alternative function lines are tied to ground and will output a “0” if selected. All pins reset to normal GPIO input operation.

2012年12月16日 · bcm2835_gpio_fsel(17, BCM2835_GPIO_FSEL_ALT3); using the bcm2835 C library and afterwards tried doing the communication with Python and pyserial, but it didn't work. You do not have the required permissions to view the files attached to this post.

2012年7月30日 · I've already did the BCM2835_FSEL_ALT5<->2 trick mentioned by @PhilE, after noticing the errors from on-system dtbo generation. Anyway, thanks for pointing out. As said it worked; had the heartbeat during boot (although it took even longer to start blinking, around 8 seconds), and can dim the LED setting the brightness between 0 and 255.

2016年2月17日 · You do not have the required permissions to view the files attached to this post.

2022年11月22日 · I thought maybe I had the wrong fsel setting but it seems to match what I see for gpio26. But even here you can see the level always stays low for some reason. The output of raspio get 12 is: GPIO 12: level=0 fsel=1 func=OUTPUT Where as the output of raspio get 26 is: GPIO 26: level=1 fsel=1 func=OUTPUT Am I missing something?

2016年8月12日 · Mn1 wrote:Please try to link the object code with proper library.

2020年4月30日 · $ raspi-gpio get 43 GPIO 43: level=1 fsel=0 func=INPUT Would be still interesting to figure out why that pin is set to function 0x4 at some point. But I guess that's a very special problem of my build.