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Documentation fixes #133

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Documentation fixes #133

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ad44e0d
Added nproc to GNU make calls
alxhoff Mar 25, 2020
731fdd7
Added some more possible problems 'white screen' help documentation
alxhoff Mar 25, 2020
54072ed
Review #133
alxhoff Apr 3, 2020
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9 changes: 6 additions & 3 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -90,7 +90,7 @@ cd fbcp-ili9341
mkdir build
cd build
cmake [options] ..
make -j
make -j `nproc`
sudo ./fbcp-ili9341
```

Expand Down Expand Up @@ -188,7 +188,7 @@ cd fbcp-ili9341
mkdir build
cd build
cmake -DSPI_BUS_CLOCK_DIVISOR=6 -DADAFRUIT_ILI9341_PITFT=ON ..
make -j
make -j `nproc`
sudo ./fbcp-ili9341
```

Expand Down Expand Up @@ -394,7 +394,7 @@ Enable the option `#define DISPLAY_ROTATE_180_DEGREES` in `config.h`. This shoul

Edit the file `config.h` in a text editor (a command line one such as `pico`, `vim`, `nano`, or SSH map the drive to your host), and find the appropriate line in the file. Add comment lines `//` in front of that text to disable the option, or remove the `//` characters to enable it.

After having edited and saved the file, reissue `make -j` in the build directory and restart fbcp-ili9341.
After having edited and saved the file, reissue ``make -j `nproc` `` in the build directory and restart fbcp-ili9341.
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@juj juj Apr 3, 2020

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Hmm, is make -j not enough to get to parallel compilation? Or does that not work in some cases?

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@alxhoff alxhoff Apr 3, 2020

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To be honest I don't really know if -j is a problem. The docs say

If there is nothing looking like an integer after the ‘-j’ option, there is no limit on the number of job slots.

What effect that has I don't know, I'm just used to always using nproc.

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@juj juj Apr 5, 2020

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Ok, let's go with just make -j then, no need to specify the nproc.


Some options are passed to the build from the CMake configuration script. You can run with `make VERBOSE=1` to see which configuration items the CMake build is passing. See the above *Configuring Build Options* section to customize the CMake configure items. For example, to remove the statistics overlay, pass `-DSTATISTICS=0` directive to CMake.

Expand Down Expand Up @@ -471,6 +471,9 @@ Unfortunately there are a number of things to go wrong that all result in a whit
- shut down and physically power off the Pi and the display in between multiple tests. Driving a display with a wrong initialization routine may put it in a bad state that needs a physical power off for it to reset,
- if there is a reset pin on the display, make sure to pass it in CMake line. Or alternatively, try driving fbcp-ili9341 without specifying the reset pin,
- make sure the display is configured to run 4-wire SPI mode, and not in parallel mode or 3-wire SPI mode. You may need to solder or desolder some connections or set a jumper to configure the specific driving mode. Support for 3-wire SPI displays does exist, but it is more limited and a bit experimental.
- If connecting the wires directly ensure that the values given are BCM pin numbers and not the physical pin numbers. See [RPi pinout](https://pinout.xyz/#).
- Try changing the BCM pins used for the reset, backlight and data control.


#### The display stays blank at boot without lighting up

Expand Down