library:rk3568:lcddrv

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Table of Contents

LCD @ Core-3568J
- 1. 硬件信息
  - 1.1 LCD接口
  - 1.2 控制接口
- 2. Linux驱动设计
  - 2.1 内核配置
  - 2.2 dts配置

LCD @ Core-3568J

1. 硬件信息

1.1 LCD接口

模块参数

分辨率：128×168
驱动芯片：ST7735S
接口类型：SPI
背光电流：30mA
电压：3.3V

模块接口

pin	Name	Feature
1	NC
2	GND
3	LED-
4	LED+
5	GND
6	/RESET	复位，低有效
7	A0	指令/数据， L：指令，H：数据
8	SDA
9	SCK
10	VCC	电源2.8~3.3v
11	IOVCC	IO电压2.8~3.3v
12	/CS	片选，低有效
13	GND
14	NC

1.2 控制接口

No	信号	pin@Core-3568J	pin@rk3568	GPIO
1	/RESET	169	GPIO0_A6
2	/CS	185	SPI0_CS0_M0	GPIO0_C6
3	SCK	175	SPI0_CLK_M0	GPIO0_B5
4	SDA	159	SPI0_MOSI_M0	GPIO0_B6
5	CD	173	GPIO0_C1
6	BL	171	GPIO0_C3

2. Linux驱动设计

2.1 内核配置

Device Drivers ‐‐‐> 
  [*] SPI support ‐‐‐> 
     <*> Rockchip SPI controller driver
     [*] User mode SPI device driver support

2.2 dts配置

2.2.1 rk3568-firefly-mplayer.dtsi

使能spi0

&spi0 {
  status = "okay";
  max-freq = <50000000>;
  spidev0@0 {
      compatible = "rockchip,spidev";
      reg = <0>; /* CS0 */
      spi-max-frequency = <5000000>;
  };
};

disable uart8

uart8于spi0管脚冲突，使uart8无效

&uart8 {
  status = "disabled";
};

library/rk3568/lcddrv.1667286660.txt.gz · Last modified: 2022/11/01 15:11 by lhaosen