Author Topic: Linux | Device Tree | NHD ‐ 4.3 ‐ 480272EF  (Read 4661 times)

Alias_Alias

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Linux | Device Tree | NHD ‐ 4.3 ‐ 480272EF
« on: February 18, 2015, 07:16:40 AM »
Hello,

i have now read a lot and I try to add my NHD ‐ 4.3 ‐ 480272EF to a BeagleBone Black.
I connect it Like :
http://e2e.ti.com/support/arm/sitara_arm/f/791/t/303632
but for this display i need :
http://elinux.org/24bit_LCD_for_BBB

This is not the big Problem.

The next thing is that i must add the TFT to the Device Tree. I have write this :

 
Code: [Select]

/*
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
/dts-v1/;

#include "am33xx.dtsi"
#include "am335x-bone-common.dtsi"

&ldo3_reg {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-always-on;
};

&mmc1 {
vmmc-supply = <&vmmcsd_fixed>;
};

&mmc2 {
vmmc-supply = <&vmmcsd_fixed>;
pinctrl-names = "default";
pinctrl-0 = <&emmc_pins>;
bus-width = <8>;
ti,non-removable;
status = "okay";
};

&am33xx_pinmux {

lcd_pins_default: lcd_pins_default {
pinctrl-single,pins = <


0x20 0x01 /* gpmc_ad8.lcd_data16, OUTPUT | MODE1 */
0x24 0x01 /* gpmc_ad9.lcd_data17, OUTPUT | MODE1 */
0x28 0x01 /* gpmc_ad10.lcd_data18, OUTPUT | MODE1 */
0x2c 0x01 /* gpmc_ad11.lcd_data19, OUTPUT | MODE1 */
0x30 0x01 /* gpmc_ad12.lcd_data20, OUTPUT | MODE1 */
0x34 0x01 /* gpmc_ad13.lcd_data21, OUTPUT | MODE1 */
0x38 0x01 /* gpmc_ad14.lcd_data22, OUTPUT | MODE1 */
0x3c 0x01 /* gpmc_ad15.lcd_data23, OUTPUT | MODE1 */

0xa0 0x00 /* lcd_data0.lcd_data0, OUTPUT | MODE0 */
0xa4 0x00 /* lcd_data1.lcd_data1, OUTPUT | MODE0 */
0xa8 0x00 /* lcd_data2.lcd_data2, OUTPUT | MODE0 */
0xac 0x00 /* lcd_data3.lcd_data3, OUTPUT | MODE0 */
0xb0 0x00 /* lcd_data4.lcd_data4, OUTPUT | MODE0 */
0xb4 0x00 /* lcd_data5.lcd_data5, OUTPUT | MODE0 */
0xb8 0x00 /* lcd_data6.lcd_data6, OUTPUT | MODE0 */
0xbc 0x00 /* lcd_data7.lcd_data7, OUTPUT | MODE0 */
0xc0 0x00 /* lcd_data8.lcd_data8, OUTPUT | MODE0 */
0xc4 0x00 /* lcd_data9.lcd_data9, OUTPUT | MODE0 */
0xc8 0x00 /* lcd_data10.lcd_data10, OUTPUT | MODE0 */
0xcc 0x00 /* lcd_data11.lcd_data11, OUTPUT | MODE0 */
0xd0 0x00 /* lcd_data12.lcd_data12, OUTPUT | MODE0 */
0xd4 0x00 /* lcd_data13.lcd_data13, OUTPUT | MODE0 */
0xd8 0x00 /* lcd_data14.lcd_data14, OUTPUT | MODE0 */
0xdc 0x00 /* lcd_data15.lcd_data15, OUTPUT | MODE0 */
0xe0 0x00 /* lcd_vsync.lcd_vsync, OUTPUT | MODE0 */
0xe4 0x00 /* lcd_hsync.lcd_hsync, OUTPUT | MODE0 */
0xe8 0x00 /* lcd_pclk.lcd_pclk, OUTPUT | MODE0 */
0xec 0x00 /* lcd_ac_bias_en.lcd_ac_bias_en, OUTPUT | MODE0 */
>;
};

nxp_hdmi_bonelt_pins: nxp_hdmi_bonelt_pins {
pinctrl-single,pins = <
0x1b0 0x03      /* xdma_event_intr0, OMAP_MUX_MODE3 | AM33XX_PIN_OUTPUT */
0xa0 0x08       /* lcd_data0.lcd_data0, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xa4 0x08       /* lcd_data1.lcd_data1, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xa8 0x08       /* lcd_data2.lcd_data2, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xac 0x08       /* lcd_data3.lcd_data3, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xb0 0x08       /* lcd_data4.lcd_data4, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xb4 0x08       /* lcd_data5.lcd_data5, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xb8 0x08       /* lcd_data6.lcd_data6, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xbc 0x08       /* lcd_data7.lcd_data7, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xc0 0x08       /* lcd_data8.lcd_data8, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xc4 0x08       /* lcd_data9.lcd_data9, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xc8 0x08       /* lcd_data10.lcd_data10, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xcc 0x08       /* lcd_data11.lcd_data11, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xd0 0x08       /* lcd_data12.lcd_data12, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xd4 0x08       /* lcd_data13.lcd_data13, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xd8 0x08       /* lcd_data14.lcd_data14, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xdc 0x08       /* lcd_data15.lcd_data15, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
0xe0 0x00       /* lcd_vsync.lcd_vsync, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT */
0xe4 0x00       /* lcd_hsync.lcd_hsync, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT */
0xe8 0x00       /* lcd_pclk.lcd_pclk, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT */
0xec 0x00       /* lcd_ac_bias_en.lcd_ac_bias_en, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT */
>;
};
nxp_hdmi_bonelt_off_pins: nxp_hdmi_bonelt_off_pins {
pinctrl-single,pins = <
0x1b0 0x03      /* xdma_event_intr0, OMAP_MUX_MODE3 | AM33XX_PIN_OUTPUT */
>;
};

ecap0_pins_default: backlight_pins {
pinctrl-single,pins = <
0x164 0x0       /* eCAP0_in_PWM0_out.eCAP0_in_PWM0_out MODE0 */
>;
};

pwm_bl_pins: pinmux_pwm_bl_pins {
pinctrl-single,pins = <
0x48 0x06       /* gpmc_a2.ehrpwm1a, OMAP_MUX_MODE6 | AM33XX_PIN_OUTPUT */
>;
};
};

&epwmss1 {
status = "okay";

ehrpwm1: ehrpwm@48302200 {
        status = "okay";
};
};

&lcdc {
pinctrl-names = "default";
pinctrl-0 = <&lcd_pins_default>;
status = "okay";
display-timings {
800x480p62 {
clock-frequency = <30000000>;
hactive = <800>;
vactive = <480>;
hfront-porch = <39>;
hback-porch = <39>;
hsync-len = <47>;
vback-porch = <29>;
vfront-porch = <13>;
vsync-len = <2>;
hsync-active = <0>;
vsync-active = <0>;
bpp = <16>;
};

482x272p62 {
clock-frequency = <90000000>;
hactive = <482>;
vactive = <272>;
hfront-porch = <2>;
hback-porch = <2>;
hsync-len = <41>;
vback-porch = <2>;
vfront-porch = <2>;
vsync-len = <3>;
hsync-active = <0>;
vsync-active = <0>;
bpp = <16>;
};
};
};

&tscadc {
        status = "okay";
        tsc {
                ti,wires = <4>;
                ti,x-plate-resistance = <200>;
                ti,coordinate-readouts = <5>;
                ti,wire-config = <0x00 0x11 0x22 0x33>;
        };

        adc {
                ti,adc-channels = <4 5 6 7>;
        };
};


/ {

backlight {
compatible      = "pwm-backlight";
pinctrl-names   = "default";
pinctrl-0       = <&pwm_bl_pins>;
status = "okay";
pwms = <&ehrpwm1 0 500000 0>;
pwm-names = "LCD7";
brightness-levels = <0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100>;
default-brightness-level = <101>; /* index to the array above */
};

/*
panel {
                compatible = "ti,tilcdc,panel";
                status = "okay";
                pinctrl-names = "default";
                pinctrl-0 = <&lcd_pins_default>;
                panel-info {
                        ac-bias           = <255>;
                        ac-bias-intrpt    = <0>;
                        dma-burst-sz      = <16>;
                        bpp               = <32>;
                        fdd               = <0x80>;
                        sync-edge         = <0>;
                        sync-ctrl         = <1>;
                        raster-order      = <0>;
                        fifo-th           = <0>;
tft-alt-mode      = <0>;
stn-565-mode      = <0>;
mono-8bit-mode    = <0>;
                };

                display-timings {
                        800x480p62 {
                                clock-frequency = <30000000>;
                                hactive = <800>;
                                vactive = <480>;
                                hfront-porch = <40>;
                                hback-porch = <40>;
                                hsync-len = <48>;
                                vback-porch = <30>;
                                vfront-porch = <13>;
                                vsync-len = <3>;
                                hsync-active = <0>;
                                vsync-active = <0>;
                        };
                };
        };
*/
};


Can you please look at :

Code: [Select]
482x272p62 {
clock-frequency = <90000000>;
hactive = <482>;
vactive = <272>;
hfront-porch = <2>;
hback-porch = <2>;
hsync-len = <41>;
vback-porch = <2>;
vfront-porch = <2>;
vsync-len = <3>;
hsync-active = <0>;
vsync-active = <0>;
bpp = <16>;
};


Is this Ok ?
Or have i make something wrong ? Or can i make something better ?

Have a nice day ;)

Paul_B

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Re: Linux | Device Tree | NHD ‐ 4.3 ‐ 480272EF
« Reply #1 on: February 18, 2015, 10:43:27 AM »
Hello,

Your timing characteristics look correct, one thing I did notice from the elinux wiki is that your panel-info {},needs to change from bpp <16> to bpp <24>.

Please keep me posted on your progress, looks like a great project  8)

Alias_Alias

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Re: Linux | Device Tree | NHD ‐ 4.3 ‐ 480272EF
« Reply #2 on: February 22, 2015, 12:18:25 PM »
Hello,

ok second try. I have now created an Overlay. The Overlay looks like :

Code: [Select]
/* 
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Purpose License Version 2 as
* published by the Free Software Foundation
*
* Original from: https://github.com/beagleboard/devicetree-source/blob/master/arch/arm/boot/dts/BB-BONE-LCD4-01-00A1.dts
*
*/

/dts-v1/;
/plugin/;

/{
compatible = "ti,beaglebone", "ti,beaglebone-black";

/* identification */
part-number = "BBB-NHD-TEST";
version = "00A1";

/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P8.45", /* lcd: lcd_data0 */
"P8.46", /* lcd: lcd_data1 */
"P8.43", /* lcd: lcd_data2 */
"P8.44", /* lcd: lcd_data3 */
"P8.41", /* lcd: lcd_data4 */
"P8.42", /* lcd: lcd_data5 */
"P8.39", /* lcd: lcd_data6 */
"P8.40", /* lcd: lcd_data7 */
"P8.37", /* lcd: lcd_data8 */
"P8.38", /* lcd: lcd_data9 */
"P8.36", /* lcd: lcd_data10 */
"P8.34", /* lcd: lcd_data11 */
"P8.35", /* lcd: lcd_data12 */
"P8.33", /* lcd: lcd_data13 */
"P8.31", /* lcd: lcd_data14 */
"P8.32", /* lcd: lcd_data15 */
"P8.15", /* lcd: lcd_data16 */
"P8.16", /* lcd: lcd_data17 */
"P8.11", /* lcd: lcd_data18 */
"P8.12", /* lcd: lcd_data19 */
"P8.17", /* lcd: lcd_data20 */
"P8.14", /* lcd: lcd_data21 */
"P8.13", /* lcd: lcd_data22 */
"P8.19", /* lcd: lcd_data23 */

"P9.15", /* keys: gpio1_16 */
"P9.23", /* keys: gpio1_17 */
"P9.16", /* keys: gpio1_19 */

"P9.27", /* lcd: gpio3_19 */
"P9.12", /* led: gpio1_28 */

"P8.27", /* lcd: lcd_vsync */
"P8.29", /* lcd: lcd_hsync */
"P8.28", /* lcd: lcd_pclk */
"P8.30", /* lcd: lcd_ac_bias_en */
"P9.14", /* pwm: ehrpwm1a */
"P9.21", /* keys: gpio0_3 */

/* the hardware IP uses */
"gpio3_19",
"gpio1_28",
"gpio1_16",
"gpio1_17",
"gpio1_19",
"gpio0_3",
"lcd",
"ehrpwm1a";



fragment@0 {
target = <&am33xx_pinmux>;

__overlay__ {

bone_lcd4_cape_led_00A1_pins: pinmux_bone_lcd4_cape_led_00A1_pins {
pinctrl-single,pins = <
0x078 0x2f      /* gpmc_be1n.gpio1_28, INPUT | PULLDIS | MODE7 */
>;
};

pwm_bl_pins: pinmux_pwm_bl_pins {
pinctrl-single,pins = <
0x48 0x06       /* gpmc_a2.ehrpwm1a, OMAP_MUX_MODE6 | AM33XX_PIN_OUTPUT */
>;
};


lcd_pins_example_NH:  pinmux_lcd_pins_example_NH {
pinctrl-single,pins = <
0x20 0x01 /* gpmc_ad8.lcd_data16, OUTPUT | MODE1 */
0x24 0x01 /* gpmc_ad9.lcd_data17, OUTPUT | MODE1 */
0x28 0x01 /* gpmc_ad10.lcd_data18, OUTPUT | MODE1 */
0x2c 0x01 /* gpmc_ad11.lcd_data19, OUTPUT | MODE1 */
0x30 0x01 /* gpmc_ad12.lcd_data20, OUTPUT | MODE1 */
0x34 0x01 /* gpmc_ad13.lcd_data21, OUTPUT | MODE1 */
0x38 0x01 /* gpmc_ad14.lcd_data22, OUTPUT | MODE1 */
0x3c 0x01 /* gpmc_ad15.lcd_data23, OUTPUT | MODE1 */

0xa0 0x00 /* lcd_data0.lcd_data0, OUTPUT | MODE0 */
0xa4 0x00 /* lcd_data1.lcd_data1, OUTPUT | MODE0 */
0xa8 0x00 /* lcd_data2.lcd_data2, OUTPUT | MODE0 */
0xac 0x00 /* lcd_data3.lcd_data3, OUTPUT | MODE0 */
0xb0 0x00 /* lcd_data4.lcd_data4, OUTPUT | MODE0 */
0xb4 0x00 /* lcd_data5.lcd_data5, OUTPUT | MODE0 */
0xb8 0x00 /* lcd_data6.lcd_data6, OUTPUT | MODE0 */
0xbc 0x00 /* lcd_data7.lcd_data7, OUTPUT | MODE0 */
0xc0 0x00 /* lcd_data8.lcd_data8, OUTPUT | MODE0 */
0xc4 0x00 /* lcd_data9.lcd_data9, OUTPUT | MODE0 */
0xc8 0x00 /* lcd_data10.lcd_data10, OUTPUT | MODE0 */
0xcc 0x00 /* lcd_data11.lcd_data11, OUTPUT | MODE0 */
0xd0 0x00 /* lcd_data12.lcd_data12, OUTPUT | MODE0 */
0xd4 0x00 /* lcd_data13.lcd_data13, OUTPUT | MODE0 */
0xd8 0x00 /* lcd_data14.lcd_data14, OUTPUT | MODE0 */
0xdc 0x00 /* lcd_data15.lcd_data15, OUTPUT | MODE0 */

0xe0 0x00 /* lcd_vsync.lcd_vsync, OUTPUT | MODE0 */
0xe4 0x00 /* lcd_hsync.lcd_hsync, OUTPUT | MODE0 */
0xe8 0x00 /* lcd_pclk.lcd_pclk, OUTPUT | MODE0 */
0xec 0x00 /* lcd_ac_bias_en.lcd_ac_bias_en, OUTPUT | MODE0 */
>;
};
};
};

fragment@1 {
target = <&epwmss1>;
__overlay__ {
status = "okay";
};
};

fragment@2 {
target = <&ehrpwm1>;
__overlay__ {
status = "okay";
};
};


fragment@3 {
target = <&ocp>;

__overlay__ {

/* avoid stupid warning */
#address-cells = <1>;
#size-cells = <1>;

backlight {
compatible      = "pwm-backlight";
pinctrl-names   = "default";
pinctrl-0       = <&pwm_bl_pins>;

pwms = <&ehrpwm1 0 500000 0>;
pwm-names = "LCD4";
brightness-levels = <0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100>;
default-brightness-level = <101>; /* index to the array above */
status = "okay";
};

tscadc {
compatible = "ti,ti-tscadc";
reg = <0x44e0d000 0x1000>;

interrupt-parent = <&intc>;
interrupts = <16>;
ti,hwmods = "adc_tsc";
status = "okay";

tsc {
ti,wires = <4>;
ti,x-plate-resistance = <200>;
ti,coordinate-readouts = <5>;
ti,wire-config = <0x00 0x11 0x22 0x33>;
};

adc {
ti,adc-channels = <4 5 6 7>;
};
};

gpio-leds-cape-lcd4 {
compatible = "gpio-leds";
pinctrl-names = "default";

pinctrl-0 = <&bone_lcd4_cape_led_00A1_pins>;

lcd4-led0 {
label = "lcd4:green:usr0";
gpios = <&gpio2 28 0>;
linux,default-trigger = "heartbeat";
default-state = "off";
};

};

/* Settings for NHD */
panel {
compatible = "tilcdc,panel";
pinctrl-names = "default";
pinctrl-0 = <&lcd_pins_example_NH>;
panel-info {
ac-bias           = <255>;
ac-bias-intrpt    = <0>;
dma-burst-sz      = <16>;
bpp               = <24>;
fdd               = <0x80>;
tft-alt-mode      = <0>;
stn-565-mode      = <0>;
mono-8bit-mode    = <0>;
sync-edge         = <0>;
sync-ctrl         = <1>;
raster-order      = <0>;
fifo-th           = <0>;
};
display-timings {
native-mode = <&timing0>;
timing0: 480x272 {
clock-frequency = <90000000>;
hactive = <482>;
vactive = <272>;
hfront-porch = <2>;
hback-porch = <2>;
hsync-len = <41>;
vback-porch = <2>;
vfront-porch = <2>;
vsync-len = <3>;
hsync-active = <0>;
vsync-active = <0>;
};
};
};

fb {
compatible = "ti,am33xx-tilcdc";
reg = <0x4830e000 0x1000>;
interrupt-parent = <&intc>;
interrupts = <36>;
ti,hwmods = "lcdc";
};

};
};
};

My Display doesn't start and i have a few questions:
My first question is:
1. In an old version of the document NHD-4.3-480272EF-ATXL at the page "Mechanical Drawing" the "Pin layout" was 1.LED+ and 2.LED-.
In the new verson the "Pin layout" is 1.LED- and 2.LED+.
What is right here ? Pease check it.

2. The next is: What must i connect to LED+ ?
The 3.3V ? The 5V ? I really don't understand that.

3. The last Pin question is: If i connect the PIN 31 DISP to HIGH do i start the display ?
Or what is this Pin for ?

To the Overlay:

4. I compiled it with CODE and then started the Overlay with CODE. Does the Display now start or must i do more ?
I think i have now applied the Overlay and the Display must start.
Maybe this is a stupid question but I'm really not sure.

5. Please take a look at this Lines:
Code: [Select]
panel-info {
ac-bias           = <255>;
ac-bias-intrpt    = <0>;
dma-burst-sz      = <16>;
bpp               = <24>;
fdd               = <0x80>;
tft-alt-mode      = <0>;
stn-565-mode      = <0>;
mono-8bit-mode    = <0>;
sync-edge         = <0>;
sync-ctrl         = <1>;
raster-order      = <0>;
fifo-th           = <0>;
};
display-timings {
native-mode = <&timing0>;
timing0: 480x272 {
clock-frequency = <90000000>;
hactive = <482>;
vactive = <272>;
hfront-porch = <2>;
hback-porch = <2>;
hsync-len = <41>;
vback-porch = <2>;
vfront-porch = <2>;
vsync-len = <3>;
hsync-active = <0>;
vsync-active = <0>;
};
};
Is this the right Code for the Panel Info ?



THANK YOU VERY MUCH FOR YOUR TIME. If you like. I would share this code if I'm ready and see some thing on the Display. ;)
Have a nice Day.

Paul_B

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Re: Linux | Device Tree | NHD ‐ 4.3 ‐ 480272EF
« Reply #3 on: February 26, 2015, 08:07:16 AM »
Hello,

Question 1: What is the correct pin out?

Answer: The pin description can be seen on page 4 in the displays datasheet.
http://www.newhavendisplay.com/specs/NHD-4.3-480272EF-ATXL.pdf

Pin 1: LED‐
Pin 2: LED+


Question 2: What must I connect to LED+ ?

Answer: You must supply 19.2V @ 40mA.


Question 3: If I connect the PIN 31 DISP to HIGH do i start the display ?

Answer: The DISP pin is used to turn on and off the TFT display. If DISP is pulled high the display will turn on.


Regarding your timing values everything looks correct  :)


Hope this helps!



Alias_Alias

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Re: Linux | Device Tree | NHD ‐ 4.3 ‐ 480272EF
« Reply #4 on: March 22, 2015, 04:52:08 AM »
Hello,

thanks for your reply.


Question 2: What must I connect to LED+ ?

Answer: You must supply 19.2V @ 40mA.


I have now checked the Backlight setting.
I would like to run it with a PWM signal of the BeagleBoneBlack.


Since I cannot start the display, I suppose that there is still missing a LED backlight block in my setup.
Unfortunately, I do not know which of the following blocks I do have to choose.

Currently, I am using the BeagleBoneBlack.
Its documentation says that I have a 5V and a 3.3V input currency.
The display has: 12‐LED backlight.
The PWM pin is coming from the BeagleBoneBlack and gives max 3.3V.

 

I think I must choose between these three:

Little :  http://www.ti.com/product/tps61160/description

Speed : http://www.ti.com/product/tps61165/description

Overpowered : http://www.ti.com/product/tps61162/description


Am I on the right way?

If yes: I would like to take the Speed Chip.

 
What do you think ? Can I pick one  of them?

Thank you very much for your help.

Paul_B

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Re: Linux | Device Tree | NHD ‐ 4.3 ‐ 480272EF
« Reply #5 on: March 24, 2015, 07:45:50 AM »
Hello,

TPS61165 from TI is an acceptable choice. You can also use FAN5333BSX:

http://www.digikey.com/product-detail/en/FAN5333BSX/FAN5333BSXCT-ND/3042778

Both will get the job done :)

 

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