Firefly-RK3128开发板摄像头的介绍

Camera 使用

前言

Firefly-RK3128 开发板上有 CIF 接口，支持 CIF 摄像头。 在 kernel/drivers/media/video 目录里有以下 CIF 摄像头的驱动：

• gc0307
• gc0308
• gc0309
• gc0328
• gc0329
• gc2015
• gc2035
• gt2005
• hm2057
• hm5065
• mt9p111
• nt99160
• nt99240
• ov2659
• ov5640
• sp0838
• sp2518

本章主要描述如何配置 CIF。

配置步骤

加入传感器的连接信息

在 kernel/arch/arm/boot/dts/rk3128-cif-sensor.dtsi 定义摄像头列表：

rk3128_cif_sensor: rk3128_cif_sensor{ compatible = "rockchip,sensor"; status = "disabled"; CONFIG_SENSOR_POWER_IOCTL_USR = <1>; CONFIG_SENSOR_RESET_IOCTL_USR = <0>; CONFIG_SENSOR_POWERDOWN_IOCTL_USR = <0>; CONFIG_SENSOR_FLASH_IOCTL_USR = <0>; CONFIG_SENSOR_AF_IOCTL_USR = <0>; // ... skip some modules gc0329{ is_front = <1>; rockchip,powerdown = <&gpio3 GPIO_D7 GPIO_ACTIVE_HIGH>; pwdn_active = <gc0329_PWRDN_ACTIVE>; #rockchip,power = <>; pwr_active = <PWR_ACTIVE_HIGH>; #rockchip,reset = <>; #rst_active = <>; #rockchip,flash = <>; #rockchip,af = <>; mir = <0>; flash_attach = <0>; resolution = <gc0329_FULL_RESOLUTION>; powerup_sequence = <gc0329_PWRSEQ>; orientation = <0>; i2c_add = <gc0329_I2C_ADDR>; i2c_rata = <100000>; i2c_chl = <0>; cif_chl = <0>; mclk_rate = <24>; }; gc0329_b { is_front = <0>; rockchip,powerdown = <&gpio3 GPIO_B3 GPIO_ACTIVE_HIGH>; pwdn_active = <gc0329_PWRDN_ACTIVE>; #rockchip,power = <>; pwr_active = <PWR_ACTIVE_HIGH>; #rockchip,reset = <>; #rst_active = <>; #rockchip,flash = <>; #rockchip,af = <>; mir = <0>; flash_attach = <0>; resolution = <gc0329_FULL_RESOLUTION>; powerup_sequence = <gc0329_PWRSEQ>; orientation = <0>; i2c_add = <gc0329_I2C_ADDR>; i2c_rata = <100000>; i2c_chl = <0>; // <0>; cif_chl = <0>; mclk_rate = <24>; }; };

这里列出 gc0329 双摄像头模组的配置，其属性解释如下：

• is_front: 0: 后置摄像头，1: 前置摄像头
• rockchip,powerdown: 定义该摄像头对应的 powerdown gpio
• pwdn_active: powerdown 的有效电平
• mir: 0: 不支持镜像，1: 支持镜像，
• resolution: 最大的分辨率
• orientation: 旋转角度，0: 0 度， 90: 90 度， 180: 180 度， 270: 270 度
• i2c_add: 摄像头的 I2C 地址
• i2c_rata: I2C 频率，单位 Hz
• i2c_chl: I2C 通道号
• cif_chl: cif 控制器信息，rk312x 仅有 cif0
• mclk_rate: 传感器时钟频率，单位：MHz

其中的常量值都在 kernel/arch/arm/mach-rockchip/rk_camera_sensor_info.h 中定义：

#define gc0329_FULL_RESOLUTION 0x30000 // 0.3 megapixel #define gc0329_I2C_ADDR 0x62 #define gc0329_PWRDN_ACTIVE 0x01 #define gc0329_PWRSEQ sensor_PWRSEQ_DEFAULT //Sensor power active level define #define PWR_ACTIVE_HIGH 0x01 #define PWR_ACTIVE_LOW 0x0

分辨率对应的图像长宽，在 kernel/drivers/media/video/generic_sensor.h 的 sensor_get_full_width_height 函数里定义：

static inline int sensor_get_full_width_height(int full_resolution, unsigned short *w, unsigned short *h) { switch (full_resolution) { case 0x30000: { *w = 640; *h = 480; break; } case 0x100000: { *w = 1024; *h = 768; break; } //... } }

启用 CIF 传感器设备

要启用 CIF ，只需在 kernel/arch/arm/boot/dts/rk3128-fireprime.dts 加入：

&rk3128_cif_sensor{ status = "okay"; };