adafruit-mirror/Raspberry-Pi-Installer-Scripts
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increase txbuflen to 32k to accomodate bcm2835

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According to the fbtft wiki: "To maximize throughput, make sure txbuflen is 16k
or 32k (default is usually 4k). This is needed because of the DMA mapping/engine
overhead per transfer that spi-bcm2835 has."
This commit is contained in:
Jessa 2021-02-18 14:13:32 -08:00
parent fcdb78d315
commit 5f3468fce2
3 changed files with 3 additions and 0 deletions
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1
overlays/minipitft114-overlay.dts
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@ -51,6 +51,7 @@
height = <240>;
col_offset = <53>;
row_offset = <40>;
txbuflen = <32768>;
dc-gpios = <&gpio 25 0>;
backlight = <&backlight>;
};

1
overlays/minipitft13-overlay.dts
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@ -51,6 +51,7 @@
rotate = <0>;
width = <240>;
height = <240>;
txbuflen = <32768>;
buswidth = <8>;
dc-gpios = <&gpio 25 0>;
led-gpios = <&gpio 26 0>;

1
overlays/st7789v_240x320-overlay.dts
View file

@ -51,6 +51,7 @@
rotate = <0>;
width = <240>;
height = <320>;
txbuflen = <32768>;
buswidth = <8>;
dc-gpios = <&gpio 25 0>;
led-gpios = <&gpio 12 0>;