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ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/LCD

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{| style="border-collapse:collapse; "

!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History

|-

!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Version!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Issue Date!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Notes

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|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|X1.Y0.Z0|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|~~Month Year~~Mar 2021|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|~~TBD~~First release

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|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|[TBD_link X.Y.Z]

~~|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|Month Year~~

~~|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|TBD~~

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~~|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|...~~

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==LCD interface ==

~~''TBD: sostituire le sezioni con le informazioni sull'uso della periferica e del suo connettore''~~

~~''Nell'esempio di seguito c'è la descrizione dell'interfaccia UART/console''~~

=== Description ===

The LCD interface available on the Evaluation Kit at the connector ~~''TBD:Jxxx''.~~ ~~''Jxx'' is a ''TBD:connector-type'' header connector for the RS232 two-wires UART3 port, used for debug purposes (bootloader and operating system serial console)~~J13.

J13 si a 40-pin, 0.5mm pitch, ZIF connector that provides the following signals:

* 18-bit RGB interface

* DE and CLK control signals

* 3.3V power for logic

* 5V power for backlight

* PWM for backlight

[[File:{{{nome-som}}-EVB-LCD-connector.png|thumb|center|500px|LCD connector]]

{| class="wikitable"

|-

|1,2,410,11,12,16,20,24,28,632,36,737,839,1040

| -

| ~~N.A.~~GND| ~~N.C.~~Ground| ~~Not connected~~

|-

| 3

| J1J18.~~189~~46| ~~RS232_RX~~LCD_PWM| ~~Receive line~~PWM for backlight

|

|-

|4,5,6

| -

| LCD_5V

| 5V for LED

| this rail is enabled by the CPU via GPIO

|-

| 7,8

| -

| LCD_VDD

| 3.3V for logic

| this rail is enabled by the CPU via GPIO

|-

|9

|J18.124

|LCD_DE

|LCD_DATA_ENABLE

|

|-

|13

|J18.144

|LCD_B7

|LCD_B7 (MSB)

|

|-

|14

|J18.142

|LCD_B6

|

|-

|15

|J18.140

|LCD_B5

|

|-

|17

|J18.138

|LCD_B4

|

|-

|18

|J18.136

|LCD_B3

|

|-

|19

|J18.134

|LCD_B2

|LCD_B2 (LSB)

|

|-

|21

|J18.158

|LCD_G7

|LCD_G7 (MSB)

|the use of this pin prevents the use of eMMC with 8bit bus

|-

|22

|J18.156

|LCD_G6

|

|-

|23

|J18.154

|LCD_G5

|

|-

|25

|J18.152

|LCD_G4

|

|-

|26

|J18.150

|LCD_G3

|

|-

|27

|J18.148

|LCD_G2

|LCD_G2 (LSB)

|

|-

|29

|J18.172

|LCD_R7

|LCD_R7 (MSB)

|

|-

|30

|J18.170

|LCD_R6

|

|-

|31

|J18.168

|LCD_R5

|

|-

|33

|J18.166

|LCD_R4

|

|-

|34

|J18.162

|LCD_R3

|

|-

|35

|J18.160

|LCD_R2

|LCD_R2 (LSB)

|

|-

|38

|J18.132

|LCD_CLK

|LCD_CLOCK

|

|}

=== Device usage ===

The connector is pinout compatible with the Ampire AM-800480BTMQW-TBSH display.

'''WARNING:''' the use of the LCD peripheral prevents the use of the eMMC on board of the ETRA SOM as 8bit bus, only 4bit bus is available.

=== Alternate connector ===

The ETRA SBC provides a secondary LCD connector (not mounted by default) for the use of 24bit LCD interface.

==== Description ====

The 24-bit LCD interface can be available for the Evaluation Kit at the connector J14. For the use of this interface please send an e-mail to [mailto:helpdesk@dave.eu helpdesk@dave.eu]

J14 si a 40-pin, 0.5mm pitch, ZIF connector that provides the following signals:

* 24-bit RGB interface

* DE, CLK, HSYNC and VSYNC control signals

* 3.3V power for logic

* 5V power for backlight

* PWM for backlight

* two GPIO signals for panel configuration

====Signals ====

The following table describes the interface signals:

{| class="wikitable"

! latexfontsize="scriptsize" | Pin#

! latexfontsize="scriptsize" | SOM Pin#

! latexfontsize="scriptsize" | Pin name

! latexfontsize="scriptsize" | Pin function

! latexfontsize="scriptsize" | Pin Notes

|-

|9,18,27,36,40

| -

| GND

| Ground

|

|-

|1,2

| -

| LCD_5V

| 5V for LED

| this rail is enabled by the CPU via GPIO

|-

| 3

| J1J18.~~187~~46| ~~RS232_TX~~LCD_PWM| ~~Transmit line~~PWM for backlight

|

|-

| 94|J18.58|LCD_5V_EN|LCD_5V power enable|can be used as GPIO if the 5V power switch is bypassed|-| 5.6

| -

| ~~DGND~~LCD_VDD| ~~Ground~~3.3V for logic| this rail is enabled by the CPU via GPIO|-|7|'''''TBD'''''|LCD_DISP|'''''TBD'''''|can be statically configured with pull-up or pull-down|-|8|J18.124|LCD_DE|LCD_DATA_ENABLE||-|10|J18.144|LCD_B7|LCD_B7 (MSB)||-|11|J18.142|LCD_B6|LCD_B6||-|12|J18.140|LCD_B5|LCD_B5||-|13|J18.138|LCD_B4|LCD_B4||-|14|J18.136|LCD_B3|LCD_B3||-|15|J18.134|LCD_B2|LCD_B2||-|16|J18.176|LCD_B1|LCD_B1||-|17|J18.174|LCD_B0|LCD_B0 (LSB)|the use of this pin prevents the use of eMMC with 8bit bus|-|19|J18.158|LCD_G7|LCD_G7 (MSB)|the use of this pin prevents the use of eMMC with 8bit bus|-|20|J18.156|LCD_G6|LCD_G6||-|21|J18.154|LCD_G5|LCD_G5||-|22|J18.152|LCD_G4|LCD_G4||-|23|J18.150|LCD_G3|LCD_G3||-|24|J18.148|LCD_G2|LCD_G2||-|25|J18.180|LCD_G1|LCD_G1|the use of this pin prevents the use of uSD with 4bit bus|-|26|J18.178|LCD_G0|LCD_G0 (LSB)||-|28|J18.172|LCD_R7|LCD_R7 (MSB)||-|29|J18.170|LCD_R6|LCD_R6||-|30|J18.168|LCD_R5|LCD_R5||-|31|J18.166|LCD_R4|LCD_R4||-|32|J18.162|LCD_R3|LCD_R3||-|33|J18.160|LCD_R2|LCD_R2||-|34|J18.184|LCD_R1|LCD_R1|the use of this pin prevents the use of eMMC with 8bit bus|-|35|J18.182|LCD_R0|LCD_R0 (LSB)||-|37|J18.130|LCD_HSYNC|LCD_HORIZONTAL_SYNC|the use of this pin prevents the use of eMMC with 8bit bus|-|38|J18.132|LCD_CLK|LCD_CLOCK||-|39|J18.128|LCD_VSYNC|LCD_VERTICAL_SYNC|

|}

~~=== Device mapping ===~~

~~UART3 is mapped to <code>/dev/ttymxc2</code> device in Linux. The peripheral is used as the default serial console, both for the bootloader and the kernel.~~

=== Device usage ===

~~To connect to~~ '''WARNING:''' the ~~debug serial port:~~ ~~# connect~~ use of the 24bit LCD peripheral prevents the ~~DB9 adapter bracket to~~ use of the ~~J22 connector~~ eMMC on board of the ~~SBCX board# connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)# start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200~~ETRA SOM as 8bit bus,~~N,8~~only 4bit bus is available. It also prevents the use of uSD device as 4bit bus,1only 1bit bus is available.

----

[[Category:ETRA]]

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