“Linux内核-摄像头驱动移植”的版本间的差异

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实验原理
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==实验原理==
 
==实验原理==
 +
DCMI(Digital Camera Interface),DCMI是一个同步并行接口,能够从外部8bit、10bit、12bit或14bit的CMOS摄像头接收高速数据流,支持不同的数据格式:YCbCr4:2:2/RGB565渐进式视频和压缩数据(JPEG)。<br>
 +
 +
[[Image:58-1-1-1.png]] <br>
 +
 +
FS-MP1A可以外接8bit的COM Camera,接口定义如下:
 +
 +
[[Image:58-1-1-2.png]] <br>
 +
 +
接口与MPU管脚对应关系如下:
 +
 +
[[Image:58-1-1-3.png]] <br>
 +
 +
[[Image:58-1-1-4.png]] <br>
 +
 +
[[Image:58-1-1-5.png]] <br>
 +
 +
[[Image:58-1-1-6.png]] <br>
 +
 +
[[Image:58-1-1-7.png]] <br>
 +
 +
{|class="wikitable"
 +
|-
 +
!原理图网络编号 !! 对应管脚 !! 管脚功能 !! 管脚功能码
 +
|-
 +
| DCMI_D0
 +
| PH9
 +
| DCMI_D0
 +
| AF13
 +
|-
 +
| DCMI_D1
 +
| PH10
 +
| DCMI_D0
 +
| AF13
 +
|-
 +
| DCMI_D2
 +
| PH11
 +
| DCMI_D0
 +
| AF13
 +
|-
 +
| DCMI_D3
 +
| PH12
 +
| DCMI_D0
 +
| AF13
 +
|-
 +
| DCMI_D4
 +
| PH14
 +
| DCMI_D0
 +
| AF13
 +
|-
 +
| DCMI_D5
 +
| PI4
 +
| DCMI_D0
 +
| AF13
 +
|-
 +
| DCMI_D6
 +
| PB8
 +
| DCMI_D0
 +
| AF13
 +
|-
 +
| DCMI_D7
 +
| PE6
 +
| DCMI_D0
 +
| AF13
 +
|-
 +
| DCMI_RESET
 +
| PA3
 +
| GPIO
 +
| ANALOG
 +
|-
 +
| DCMI_PWDN
 +
| PA4
 +
| GPIO
 +
| ANALOG
 +
|-
 +
| DCMI_PIXCK
 +
| PA6
 +
| DCMI_PIXCLK
 +
| AF13
 +
|-
 +
| DCMI_VSYNC
 +
| PB7
 +
| DCMI_VSYNC
 +
| AF13
 +
|}
 +
*DCMI设备树节点<br>
 +
 +
参考文档:
 +
<pre><nowiki>
 +
Documentation/devicetree/bindings/media/st,stm32-dcmi.txt
 +
Documentation/devicetree/bindings/media/video-interfaces.txt
 +
</nowiki></pre>
 +
内核中ST对STM32MP15x系列芯片的设备树资源了做了定义,可参见:
 +
arch/arm/boot/dts/stm32mp151.dtsi
 +
stm32mp151中dcmi定义如下:
 +
<pre><nowiki>
 +
dcmi: dcmi@4c006000 {
 +
compatible = "st,stm32-dcmi";
 +
reg = <0x4c006000 0x400>;
 +
interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
 +
resets = <&rcc CAMITF_R>;
 +
clocks = <&rcc DCMI>;
 +
clock-names = "mclk";
 +
dmas = <&dmamux1 75 0x400 0xe0000001>;
 +
dma-names = "tx";
 +
status = "disabled";
 +
};
 +
</nowiki></pre>
 +
上述代码只对dcmi做了基本的初始化,并没有针对不同的硬件设计做适配,所以需结合硬件补全设备树节点信息。<br>
 +
 +
参考帮助文档及内核中其它STM32MP157设备树中对于dcmi的定义,修改dcmi内容如下:
 +
<pre><nowiki>
 +
&dcmi {
 +
status = "okay";
 +
pinctrl-names = "default", "sleep";
 +
pinctrl-0 = <&dcmi_pins_a>;
 +
pinctrl-1 = <&dcmi_sleep_pins_a>;
 +
 +
port {
 +
dcmi_0: endpoint {
 +
remote-endpoint = <&ov5640_0>;
 +
bus-width = <8>;
 +
hsync-active = <0>;
 +
vsync-active = <0>;
 +
pclk-sample = <1>;
 +
pclk-max-frequency = <77000000>;
 +
};
 +
};
 +
};
 +
</nowiki></pre>
 +
由于stm32mp15-pinctrl.dtsi中对于DCMI管脚的定义与FS-MP1A实际使用管脚一致,所以无需修改
 +
 +
*CMOS Camera设备树节点<br>
 +
 +
FS-MP1A支持多款COMS Camera,本节以ov5640为例:<br>
 +
 +
参考文档:
 +
Documentation/devicetree/bindings/media/i2c/ov5640.txt
 +
参考帮助文档及内核中其它STM32MP157设备树中对于ov5640的定义,修改dcmi内容如下:
 +
<pre><nowiki>
 +
ov5640: camera@3c {
 +
compatible = "ovti,ov5640";
 +
reg = <0x3c>;
 +
clocks = <&clk_ext_camera>;
 +
clock-names = "xclk";
 +
DOVDD-supply = <&v2v8>;
 +
powerdown-gpios = <&gpioa 4 (GPIO_ACTIVE_HIGH | GPIO_PUSH_PULL)>;
 +
reset-gpios = <&gpioa 3 (GPIO_ACTIVE_LOW | GPIO_PUSH_PULL)>;
 +
rotation = <180>;
 +
status = "okay";
 +
 +
port {
 +
ov5640_0: endpoint {
 +
remote-endpoint = <&dcmi_0>;
 +
bus-width = <8>;
 +
data-shift = <2>; /* lines 9:2 are used */
 +
hsync-active = <0>;
 +
vsync-active = <0>;
 +
pclk-sample = <1>;
 +
pclk-max-frequency = <77000000>;
 +
  };
 +
};
 +
};
 +
</nowiki></pre>
 +
*2.8V电源定义<br>
 +
 +
前文已经说过如何添加电源节点,本节不再重复,在根节点添加&v2v8节点,内容如下:
 +
<pre><nowiki>
 +
v2v8_audio: regulator-v2v8 {
 +
compatible = "regulator-fixed";
 +
regulator-name = "v2v8";
 +
regulator-min-microvolt = <2800000>;
 +
regulator-max-microvolt = <2800000>;
 +
regulator-always-on;
 +
regulator-boot-on;
 +
};
 +
</nowiki></pre>
 +
*24M时钟定义<br>
 +
 +
参考文档:
 +
Documentation/devicetree/bindings/clock/fixed-clock.yaml
 +
参考帮助文档或内核中其他设备树文件,对于时钟的定义,增加内容如下:
 +
<pre><nowiki>
 +
clocks {
 +
clk_ext_camera: clk-ext-camera {
 +
#clock-cells = <0>;
 +
compatible = "fixed-clock";
 +
clock-frequency = <24000000>;
 +
};
 +
};
 +
</nowiki></pre>
 +
 
==实验目的==
 
==实验目的==
 
==实验平台==
 
==实验平台==
 
==实验步骤==
 
==实验步骤==

2020年7月28日 (二) 13:26的版本

实验原理

DCMI(Digital Camera Interface),DCMI是一个同步并行接口,能够从外部8bit、10bit、12bit或14bit的CMOS摄像头接收高速数据流,支持不同的数据格式:YCbCr4:2:2/RGB565渐进式视频和压缩数据(JPEG)。

58-1-1-1.png

FS-MP1A可以外接8bit的COM Camera,接口定义如下:

58-1-1-2.png

接口与MPU管脚对应关系如下:

58-1-1-3.png

58-1-1-4.png

58-1-1-5.png

58-1-1-6.png

58-1-1-7.png

原理图网络编号 对应管脚 管脚功能 管脚功能码
DCMI_D0 PH9 DCMI_D0 AF13
DCMI_D1 PH10 DCMI_D0 AF13
DCMI_D2 PH11 DCMI_D0 AF13
DCMI_D3 PH12 DCMI_D0 AF13
DCMI_D4 PH14 DCMI_D0 AF13
DCMI_D5 PI4 DCMI_D0 AF13
DCMI_D6 PB8 DCMI_D0 AF13
DCMI_D7 PE6 DCMI_D0 AF13
DCMI_RESET PA3 GPIO ANALOG
DCMI_PWDN PA4 GPIO ANALOG
DCMI_PIXCK PA6 DCMI_PIXCLK AF13
DCMI_VSYNC PB7 DCMI_VSYNC AF13
  • DCMI设备树节点

参考文档:

Documentation/devicetree/bindings/media/st,stm32-dcmi.txt
Documentation/devicetree/bindings/media/video-interfaces.txt

内核中ST对STM32MP15x系列芯片的设备树资源了做了定义,可参见:

arch/arm/boot/dts/stm32mp151.dtsi

stm32mp151中dcmi定义如下:

dcmi: dcmi@4c006000 {
	compatible = "st,stm32-dcmi";
	reg = <0x4c006000 0x400>;
	interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
	resets = <&rcc CAMITF_R>;
	clocks = <&rcc DCMI>;
	clock-names = "mclk";
	dmas = <&dmamux1 75 0x400 0xe0000001>;
	dma-names = "tx";
	status = "disabled";
};

上述代码只对dcmi做了基本的初始化,并没有针对不同的硬件设计做适配,所以需结合硬件补全设备树节点信息。

参考帮助文档及内核中其它STM32MP157设备树中对于dcmi的定义,修改dcmi内容如下:

&dcmi {
	status = "okay";
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&dcmi_pins_a>;
	pinctrl-1 = <&dcmi_sleep_pins_a>;

	port {
		dcmi_0: endpoint {
			remote-endpoint = <&ov5640_0>;
			bus-width = <8>;
			hsync-active = <0>;
			vsync-active = <0>;
			pclk-sample = <1>;
			pclk-max-frequency = <77000000>;
		};
	};
};

由于stm32mp15-pinctrl.dtsi中对于DCMI管脚的定义与FS-MP1A实际使用管脚一致,所以无需修改

  • CMOS Camera设备树节点

FS-MP1A支持多款COMS Camera,本节以ov5640为例:

参考文档:

Documentation/devicetree/bindings/media/i2c/ov5640.txt

参考帮助文档及内核中其它STM32MP157设备树中对于ov5640的定义,修改dcmi内容如下:

ov5640: camera@3c {
	compatible = "ovti,ov5640";
	reg = <0x3c>;
	clocks = <&clk_ext_camera>;
	clock-names = "xclk";
	DOVDD-supply = <&v2v8>;
	powerdown-gpios = <&gpioa 4 (GPIO_ACTIVE_HIGH | GPIO_PUSH_PULL)>;
	reset-gpios = <&gpioa 3 (GPIO_ACTIVE_LOW | GPIO_PUSH_PULL)>;
	rotation = <180>;
	status = "okay";

	port {
		ov5640_0: endpoint {
			remote-endpoint = <&dcmi_0>;
			bus-width = <8>;
			data-shift = <2>; /* lines 9:2 are used */
			hsync-active = <0>;
			vsync-active = <0>;
			pclk-sample = <1>;
			pclk-max-frequency = <77000000>;
	  	};
	};
};	
  • 2.8V电源定义

前文已经说过如何添加电源节点,本节不再重复,在根节点添加&v2v8节点,内容如下:

v2v8_audio: regulator-v2v8 {
	compatible = "regulator-fixed";
	regulator-name = "v2v8";
	regulator-min-microvolt = <2800000>;
	regulator-max-microvolt = <2800000>;
	regulator-always-on;
	regulator-boot-on;
};
  • 24M时钟定义

参考文档:

Documentation/devicetree/bindings/clock/fixed-clock.yaml

参考帮助文档或内核中其他设备树文件,对于时钟的定义,增加内容如下:

clocks {
	clk_ext_camera: clk-ext-camera {
		#clock-cells = <0>;
		compatible = "fixed-clock";
		clock-frequency = <24000000>;
	};
};

实验目的

实验平台

实验步骤