Hi,
after having a hard time getting the ILI9341 touchscreen working with the NanoPi Neo (Allwinner H3) it seems to work now.
To have more GPIOs available for other stuff the touch and display need to share SPI0
I would like to upload it to github because there is basically nothing out of the box available but I'm a total noob with NanoPi, Armbian and overlays so maybe someone could look at it.
root@nanopineo:~# uname -a
Linux nanopineo 5.15.93-sunxi #23.02.2 SMP Fri Feb 17 00:00:00 UTC 2023 armv7l armv7l armv7l GNU/Linux
This is the wiring between ILI9341 and NanoPi Neo:
/*
3.3v <--> VCC & LED
GND <--> GND
PC2 <--> SCK & T_CLK
PC1 <--> SDO<MISO> & T_DO
PC0 <--> SDI<MOSI> & T_DIN
PA1 <--> DC
PG8 <--> RESET
PC3 <--> CS
PA3 <--> T_CS
PG9 <--> T_IRG
*/
This is the overlay:
/dts-v1/;
/plugin/;
/ {
compatible = "allwinner,sun8i-h3";
fragment@0 {
target = <&pio>;
__overlay__ {
spi0_cs1: spi0_cs1 {
pins = "PC3";
function = "gpio_out";
output-high;
};
spi1_cs1: spi1_cs1 {
pins = "PA3";
function = "gpio_out";
output-high;
};
opiz_display_pins: opiz_display_pins {
pins = "PA1", "PG8", "PA6";
function = "gpio_out";
};
ads7846_pins: ads7846_pins {
pins = "PG9";
function = "irq";
};
};
};
fragment@1 {
target = <&spi1>;
__overlay__ {
pinctrl-names = "default", "default";
pinctrl-1 = <&spi1_cs1>;
cs-gpios = <0>, <&pio 0 3 0>; /* PA3 */
};
};
fragment@2 {
target = <&spi0>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
pinctrl-names = "default", "default";
cs-gpios= <&pio 2 3 0>, <&pio 0 3 1>;
opizdisplay: opiz-display@0 {
pinctrl-1 = <&spi0_cs1>;
reg = <0>; /* Chip Select 0 */
compatible = "ilitek,ili9341";
spi-max-frequency = <1000000>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&opiz_display_pins>;
rotate = <90>;
bgr = <0>;
fps = <33>;
buswidth = <8>;
dc-gpios = <&pio 0 1 0>; /* PIN_22 GPIOA1 > */
reset-gpios = <&pio 6 8 1 >; /* GPIOG8> */
/*led-gpios=<&pio 0 6 0>; PIN_12 GPIOA6 > */
debug=<4>;
};
ads7846: ads7846@1 {
reg = <1>; /* Chip Select 1 */
compatible = "ti,ads7846";
spi-max-frequency = <1000000>;
status = "okay";
pinctrl-2=<&spi1_cs1 &spi1_cs1>;
pinctrl-names = "default";
pinctrl-3 = <&ads7846_pins>;
interrupt-parent = <&pio>;
interrupts = <6 9 2>; /* PG9 IRQ_TYPE_EDGE_FALLING */
pendown-gpio = <&pio 6 9 0>; /* PG9 */
/* driver defaults, optional */
ti,x-min = /bits/ 16 <0>;
ti,y-min = /bits/ 16 <0>;
ti,x-max = /bits/ 16 <0x0FFF>;
ti,y-max = /bits/ 16 <0x0FFF>;
ti,pressure-min = /bits/ 16 <0>;
ti,pressure-max = /bits/ 16 <0xFFFF>;
ti,x-plate-ohms = /bits/ 16 <400>;
};
};
};
};
This is the /boot/armbianEnv.txt
verbosity=1
bootlogo=false
console=serial
disp_mode=1920x1080p60
overlay_prefix=sun8i-h3
overlays=usbhost1 usbhost2 spi0
param_spidev_spi_bus=0
param_spidev_spi_cs=1
param_spidev_spi_cs=0
rootdev=UUID=XYZ-LONG-UUID-IS-LONG
rootfstype=ext4
user_overlays=ili-touch-spi
usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u
After connecting via ssh and starting evtest it shows this when touched ( not sure if it shows the correct coordinates yet )
Event: time 1682020476.763295, -------------- SYN_REPORT ------------
Event: time 1682020476.775286, type 3 (EV_ABS), code 0 (ABS_X), value 535
Event: time 1682020476.775286, type 3 (EV_ABS), code 1 (ABS_Y), value 3553
Event: time 1682020476.775286, type 3 (EV_ABS), code 24 (ABS_PRESSURE), value 65169
So it looks like everything is working but to be on the safe side I would like to wait until some pro reviewed the overlay.
Thanks.
Update: changed spi-max-frequency = <1000000>; to: spi-max-frequency = <2000000>; for display and touch.