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Camera 使用

前言

Firefly-RK3128 開發(fā)板上有 CIF 接口，支持 CIF 攝像頭。在 kernel/drivers/media/video 目錄里有以下 CIF 攝像頭的驅動：

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。

配置步驟

加入傳感器的連接信息

在 kernel/arch/arm/boot/dts/rk3128-cif-sensor.dtsi 定義攝像頭列表：

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>; }; };

這里列出 gc0329 雙攝像頭模組的配置，其屬性解釋如下：

is_front: 0: 后置攝像頭，1: 前置攝像頭
rockchip,powerdown: 定義該攝像頭對應的 powerdown gpio
pwdn_active: powerdown 的有效電平
mir: 0: 不支持鏡像，1: 支持鏡像，
resolution: 最大的分辨率
orientation: 旋轉角度，0: 0 度， 90: 90 度， 180: 180 度， 270: 270 度
i2c_add: 攝像頭的 I2C 地址
i2c_rata: I2C 頻率，單位 Hz
i2c_chl: I2C 通道號
cif_chl: cif 控制器信息，rk312x 僅有 cif0
mclk_rate: 傳感器時鐘頻率，單位：MHz

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

#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

分辨率對應的圖像長寬，在 kernel/drivers/media/video/generic_sensor.h 的 sensor_get_full_width_height 函數(shù)里定義：

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; } //... } }