Zedboard & Zynq 图像采集 视频开发 (一) 硬件平台搭建

前言

之前没有写过博客，这是第一次写，希望能记录下自己的开发流程，如果能给一些人一些参考，那是荣幸之至，如果有疏漏错误之处，大家可以互相讨论。

Zynq是一款比较强大的SOC，内部包含FPGA和Cortex-A9双核的ARM，我的这个设计就是用Zedboard开发板，搭配一个OV7725的cmos图像传感器，实现图像的采集和简单的传输，具体功能包括：图像采集，Bayer图像转RGB888图像，自制VDMA模块，VGA controller，Linux系统视频发送，Linux虚拟机QT客户端视频显示，后续可能还会再添加一些功能模块。其中OV7725寄存器初始化，Bayer图像转RGB888图像，VGA controller参考了crazybingo的设计。

这里不再赘述Zynq内部结构等，而是直接针对具体应用，如果有不明白的可以看官方手册或者给我留言。

硬件设计

先上一张图片

使用了Zedboard的pmod接口，做了适当的修改，也可以使用杜邦线连接，管脚约束如下：

set_property PACKAGE_PIN Y9 [get_ports ext_clk]
set_property IOSTANDARD LVCMOS25 [get_ports ext_clk]

#
#VGA
#
set_property PACKAGE_PIN V20 [get_ports {vga_r[0]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_r[0]}]

set_property PACKAGE_PIN U20 [get_ports {vga_r[1]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_r[1]}]

set_property PACKAGE_PIN V19 [get_ports {vga_r[2]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_r[2]}]

set_property PACKAGE_PIN V18 [get_ports {vga_r[3]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_r[3]}]

set_property PACKAGE_PIN AB22 [get_ports {vga_g[0]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_g[0]}]

set_property PACKAGE_PIN AA22 [get_ports {vga_g[1]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_g[1]}]

set_property PACKAGE_PIN AB21 [get_ports {vga_g[2]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_g[2]}]

set_property PACKAGE_PIN AA21 [get_ports {vga_g[3]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_g[3]}]

set_property PACKAGE_PIN Y21 [get_ports {vga_b[0]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_b[0]}]

set_property PACKAGE_PIN Y20 [get_ports {vga_b[1]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_b[1]}]

set_property PACKAGE_PIN AB20 [get_ports {vga_b[2]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_b[2]}]

set_property PACKAGE_PIN AB19 [get_ports {vga_b[3]}]
set_property IOSTANDARD LVCMOS25 [get_ports {vga_b[3]}]

set_property PACKAGE_PIN AA19 [get_ports vga_hs]
set_property IOSTANDARD LVCMOS25 [get_ports vga_hs]

set_property PACKAGE_PIN Y19 [get_ports vga_vs]
set_property IOSTANDARD LVCMOS25 [get_ports vga_vs]


set_property PACKAGE_PIN Y10 [get_ports {cmos_data[0]}]
set_property IOSTANDARD LVCMOS25 [get_ports {cmos_data[0]}]

set_property PACKAGE_PIN AB9 [get_ports {cmos_data[1]}]
set_property IOSTANDARD LVCMOS25 [get_ports {cmos_data[1]}]

set_property PACKAGE_PIN AA9 [get_ports {cmos_data[2]}]
set_property IOSTANDARD LVCMOS25 [get_ports {cmos_data[2]}]

set_property PACKAGE_PIN AA8 [get_ports {cmos_data[3]}]
set_property IOSTANDARD LVCMOS25 [get_ports {cmos_data[3]}]

set_property PACKAGE_PIN W12 [get_ports {cmos_data[4]}]
set_property IOSTANDARD LVCMOS25 [get_ports {cmos_data[4]}]

set_property PACKAGE_PIN V12 [get_ports {cmos_data[5]}]
set_property IOSTANDARD LVCMOS25 [get_ports {cmos_data[5]}]

set_property PACKAGE_PIN W11 [get_ports {cmos_data[6]}]
set_property IOSTANDARD LVCMOS25 [get_ports {cmos_data[6]}]

set_property PACKAGE_PIN W10 [get_ports {cmos_data[7]}]
set_property IOSTANDARD LVCMOS25 [get_ports {cmos_data[7]}]

set_property PACKAGE_PIN AB10 [get_ports cmos_sclk]
set_property IOSTANDARD LVCMOS25 [get_ports cmos_sclk]

set_property PACKAGE_PIN AA11 [get_ports cmos_sdat]
set_property IOSTANDARD LVCMOS25 [get_ports cmos_sdat]

set_property PACKAGE_PIN V9 [get_ports cmos_pclk]
set_property IOSTANDARD LVCMOS25 [get_ports cmos_pclk]

set_property PACKAGE_PIN V10 [get_ports cmos_xclk]
set_property IOSTANDARD LVCMOS25 [get_ports cmos_xclk]

set_property PACKAGE_PIN V8 [get_ports cmos_vsync]
set_property IOSTANDARD LVCMOS25 [get_ports cmos_vsync]

set_property PACKAGE_PIN W8 [get_ports cmos_href]
set_property IOSTANDARD LVCMOS25 [get_ports cmos_href]

附上一张成像效果图

接下来的文章中就开始整个系统设计