【zynq课程笔记】【裸机】【第20课】【基于VDMA的RGB TFT显示】

admin · 发表于 2023-6-8 20:21:27

ZYNQ核配置流程
1、根据开发板上内存容量配置好DDR3型号，选择MT41K128M16（单片256MB），或MT41K256M16（单片512MB），后缀任意，位宽根据硬件结构选择16bit（1片）或32bit（2片）
2、配置好MIO的电压，将Bank1的切换为1.8V
3、如需要将程序固化到QSPI，请打开QSPI控制器，管脚选择MIO1~MIO6
4、如需将程序固化到SD卡，请打开SD0控制器，管脚选择MIO40-MIO45
5、如需使用串口打印调试信息，请使能UART1，管脚选择MIO48和MIO49
6、如需通过PS给PL提供时钟，配置PL Fabric Clocks中的时钟频率和个数
7、如需通过AXI-Lite读写FPGA侧的逻辑，使能PS-PL Configuration中的GP Master AXI Interface
8、如需使用FPGA获取PS侧存储器中的内容，使能PS-PL Configuration中的HP Slave AXI Interface
9、更多内容，根据自己需求配置

本系统用到2路时钟，一路给AXI总线使用，用来完成各个外设的寄存器读写，以及VDMA读取PS的DDR3使用。另一路给显示时序生成器和同步器使用，并输出给TFT显示屏作为像素时钟。

RGB TFT管脚信息约束内容

set_property IOSTANDARD LVCMOS33 [get_ports lcd_pclk]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[15]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[14]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[13]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[12]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[11]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[10]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[9]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[8]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[7]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[6]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[5]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[4]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[3]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[2]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[1]}]
set_property IOSTANDARD LVCMOS33 [get_ports {lcd_data[0]}]
set_property IOSTANDARD LVCMOS33 [get_ports lcd_de]
set_property IOSTANDARD LVCMOS33 [get_ports lcd_hs]
set_property IOSTANDARD LVCMOS33 [get_ports lcd_vs]
set_property IOSTANDARD LVCMOS33 [get_ports lcd_bl]
set_property PACKAGE_PIN U15 [get_ports lcd_pclk]
set_property PACKAGE_PIN W20 [get_ports {lcd_data[15]}]
set_property PACKAGE_PIN W19 [get_ports {lcd_data[14]}]
set_property PACKAGE_PIN V17 [get_ports {lcd_data[13]}]
set_property PACKAGE_PIN V16 [get_ports {lcd_data[12]}]
set_property PACKAGE_PIN T15 [get_ports {lcd_data[11]}]
set_property PACKAGE_PIN V20 [get_ports {lcd_data[10]}]
set_property PACKAGE_PIN U17 [get_ports {lcd_data[9]}]
set_property PACKAGE_PIN V18 [get_ports {lcd_data[8]}]
set_property PACKAGE_PIN T16 [get_ports {lcd_data[7]}]
set_property PACKAGE_PIN R16 [get_ports {lcd_data[6]}]
set_property PACKAGE_PIN U19 [get_ports {lcd_data[5]}]
set_property PACKAGE_PIN Y19 [get_ports {lcd_data[4]}]
set_property PACKAGE_PIN W18 [get_ports {lcd_data[3]}]
set_property PACKAGE_PIN Y18 [get_ports {lcd_data[2]}]
set_property PACKAGE_PIN W16 [get_ports {lcd_data[1]}]
set_property PACKAGE_PIN Y17 [get_ports {lcd_data[0]}]
set_property PACKAGE_PIN W15 [get_ports lcd_de]
set_property PACKAGE_PIN U14 [get_ports lcd_hs]
set_property PACKAGE_PIN W14 [get_ports lcd_vs]
set_property PACKAGE_PIN R17 [get_ports lcd_bl]

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RGB888转RGB565代码

module rgb888to565(
input [23:0]rgb888_data,
output [15:0]rgb565_data
);
wire [4:0]r_data;
wire [5:0]g_data;
wire [4:0]b_data;
assign r_data = rgb888_data[23:19];
assign g_data = rgb888_data[15:10];
assign b_data = rgb888_data[ 7:3];
assign rgb565_data = {r_data,g_data,b_data};
endmodule

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SDK中软件C代码

#include "xparameters.h"
#include "xaxivdma.h"
#include "xvtc.h"
#include "xil_cache.h"
#include "pic0.h"
int run_triple_frame_buffer(XAxiVdma* InstancePtr, int DeviceId, int hsize,
int vsize, int buf_base_addr, int number_frame_count,
int enable_frm_cnt_intr);
unsigned int srcBuffer = (XPAR_PS7_DDR_0_S_AXI_BASEADDR + 0x1000000);
void Vtc_Init(XVtc *Vtc_Inst)
{
XVtc_Config *vtcConfig;
vtcConfig = XVtc_LookupConfig(XPAR_VTC_0_DEVICE_ID);
XVtc_CfgInitialize(Vtc_Inst, vtcConfig, vtcConfig->BaseAddress);
}
//显示图片
void Pic_Display(uint8_t *frame,const uint8_t *Pic)
{
uint16_t width,height;
uint16_t x_pos, y_pos;
uint16_t x_max, y_max;
uint32_t stride_mm = 0;
uint32_t stride_pic = 8;
uint16_t Cnt = 0;
width = (Pic[2]<<8) + Pic[3];//读取图片宽度
height = (Pic[4]<<8) + Pic[5];//读取图片高度
if(width < 800)
x_max = width;
else
x_max = 800;
if(height < 480)
y_max = height;
else
y_max = 480;
for(y_pos=0;y_pos<y_max;y_pos++)
{
for(x_pos=0;x_pos<x_max;x_pos++)
{
frame[stride_mm + Cnt] = Pic[stride_pic + Cnt];
frame[stride_mm + Cnt + 1] = Pic[stride_pic + Cnt + 1];
frame[stride_mm + Cnt + 2] = Pic[stride_pic + Cnt + 2];
Cnt+=3;
}
stride_mm += 800*3;
stride_pic += width*3;
Cnt = 0;
}
//刷新Cache，更新图像
Xil_DCacheFlush();
}
int main(void)
{
XAxiVdma Vdma_Inst;
XVtc Vtc_Inst;
//清空Buffer
memset((uint8_t*)srcBuffer,0x00,800*480*3);
run_triple_frame_buffer(&Vdma_Inst, 0, 800, 480,srcBuffer, 0, 0);
Vtc_Init(&Vtc_Inst);
XVtc_EnableGenerator(&Vtc_Inst);
Pic_Display((uint8_t*)srcBuffer,gImage_pic0);
return 0;
}

复制代码

图片数据文件：

pic0.rar (845.25 KB, 下载次数: 190)

admin · 发表于 2023-6-8 22:32:06

课程随堂工程文件，方便大家做的时候比对着做。

VDMA_RGBTFT.rar (5.93 MB, 下载次数: 193)

pg044_v_axis_vid_out.pdf (1.07 MB, 下载次数: 176)

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【zynq课程笔记】【裸机】【第20课 】【基于VDMA的RGB TFT显示】

【zynq课程笔记】【裸机】【第20课】【基于VDMA的RGB TFT显示】