树莓派3 [硬件教程]-LVDS显示屏接线教程
树莓派3-LVDS显示屏教程
树莓派3
版本描述日期
V1.0 创建2014.1.25
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目录
第1章版权声明 (3)
第2章Introduction (4)
2.1Powersupply (4)
2.2Hardware Connections (4)
2.3Software Configuration (6)
第1章版权声明
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第2章Introduction
To use a LVDS TFT-LCD display with Superboard is very simple job.
There are two main activities do to:
1. Connect the LVDS to Superboard.
2. Configure script.bin for LVDS display.
For this example I will use a CHI-MEI G070Y2-L01 800x480 LED backlight TFT-LCD. For other displays there would be different power-supply requirements, LCD I/O pin layouts and script.fex values.
2.1 Powersupply
The LCD is a device which require a lot of power to work so we need two extra-power supplies:
1. One at 3.3V to supply LCD main board.
2. One at 12V to supply LCD backlight system.
NB:you can't use 3.3V from Superboard because the display will typically have a Rush Current of > 1A at startup and Superboard can't supply that much power.
2.2 Hardware Connections
Generally the following can be said of the hardware connection.
1. The pins VDD, VCC or similar must be connected to 3.3V external supply
2. The pins VDD_LED, VDD_BL or similar must be connected to 12V external backlight
supply
3. The pins GND must be connected to both Superboard and external supply GND
4. Each LVDS lane RX0+/- to RX3+/- and the clock lane RXC+/- must be connected to
corrosponding pins on Superboard
Superboard U14 G070Y2-L01 LVDS
I/O PIN
Notes
12 PD8 (LCDD8/LVDS0P3)
01 (RX3+)
11 PD9
02 (RX3-)
(LCDD9/LVDS0N3)
-N/A- 03 (NC) Leave unconnected.
-N/A- 04 (FRC) Must be connected to extra 3.3V power supply VCC.
02 Ground 05 (GND) Must be connected also with extra 3.3V power supply Ground.
07 PD6 (LCDD6/LVDS0PC)
06 (RXC+)
10 PD7 (LCDD7/LVDS0NC)
07 (RXC-)
02 Ground 08 (GND) Must be connected also with extra 3.3V power supply Ground.
05 PD4 (LCDD4/LNVS0P2)
09 (RX2+)
08 PD5 (LCDD5/LVDS0N2)
10 (RX2-)
02 Ground 11 (GND) Must be connected also with extra 3.3V power supply Ground.
03 PD2 (LCDD2/LVDS0P1)
12 (RX1+)
06 PD3 (LCDD3/LVDS0N1)
13 (RX1-)
02 Ground 14 (GND) Must be connected also with extra 3.3V power supply Ground.
01 PD0 (LCDD0/LVDSP0)
15 (RX0)
04 PD1 (LCDD1/LVDS0N0)
16 (RX0)
-N/A- 17 (LR) Leave unconnected. T ogether with UD describe only display scanning direction.
-N/A- 18 (UD) Leave unconnected. T ogether with LR describe only display scanning direction.
-N/A- 19 (VCC_IN) Must be connected to extra 3.3V power supply VCC.
-N/A- 29 (VCC_IN) Must be connected to extra 3.3V power supply VCC.
2.3 Software Configuration
At this point is important to understand HOW TO set properly the A20 chip to run with the specific display settings. More simple job is recover and set display X/Y resolutions. With example's devices we should use:
Now we will enter in the more complex range of settings regarding timings.
At this point only display datasheet can help us with the TIMING CHARACTERISTICS: Vertical Display Parameter Symbol Min. Typ. Max Unit Note
Period Tv 490 500 550 Th Tv = Tvd + Tvb
Active Tvd - 480 - Th
Blanking Tvb 10 20 70 Th
Horizzontal Display Parameter Symbol Min. Typ. Max Unit Note
Period Th 930 992 1090 T clock Th = Thd + Thb
Active Thd - 800 - T clock
Blanking Thb 130 192 290 T clock
Clock Frequency Symbol Min. Typ. Max Unit Note
1/T clock 27 29.5 33 MHz
1. LCD Data Clock Frequency
Looking in the table, at field Clock Frequency, a good value for lcd_dclk_freq should be comprised between 29.5 to 33 MHz.
The value of 30MHz should go fine so:
Check whether 24 or 18 bit color is used, and set
1. LCD horizontal sync back porch
2. LCD horizontal sync total cycle
3. LCD vertical sync back porch
4. LCD vertical sync total cycle * 2
In the upon table we can the needed values.
1. Horizontal sync total sycle (lcd_ht) is the same as horizontal period in the datasheet
which is = 1055 at 30Mhz
2. Horizontal back porch (lcd_hpb) is the same as horizontal blanking in the datasheet,
which is the difference between horizontal period and the horizontal active time
(1055-800) which is = 255, here 200 is used an approximate value
3. Vertical sync total cycle (lcd_vt) is the same as 2*vertical period in the datasheet which
is = 1050 at 30Mhz
4. Horizontal back porch (lcd_hpb) is the same as 2*vertical blanking in the datasheet,
which is the difference between 2*vertical period and the 2*vertical active time
(1050-1000) which is = 50, 25 is used as an approximate value.
So the final values are:
So the final config of the script.fex file: