OpenMV 驱动自己的LCD屏（修改后）
OpenMV 驱动自己的LCD屏
在写这个代码之前参考一位老哥（点击进入查看大佬的源代码）的代码，但是他使用的是OpenMV V3,我的是OpenMV V4 H7 Plus，运行他的源代码后发现并不能显示。
所以我在他的代码基础上进行了更改，来适配新版本的OpenMV。
其中最重要的更改就是write_image（）这个函数，OpenMV返回的image对象并不能直接拿来给SPI发送，因为他会丢掉GRB565 16位数据的低（或高）八位，所以，我又开辟了一个新的数据缓存区：
fbuf = bytearray(320)#建立帧缓冲区，对于每个RGB565像素，帧缓冲区都需2字节
然后把这个数据按照高低顺序用SPI发送出去就可以了。下面是全部的代码：
## OpenMV 驱动自己的LCD屏
# 驱动IC ILI9341
# 分辨率 240*320 QVGA 2.2寸
import time
from pyb import Pin, SPI
fbuf = bytearray(320)#建立帧缓冲区，对于每个RGB565像素，帧缓冲区都需2字节
# IO接线：
# SDO/MISO ---> P1(MISO) 如果不读LCD颜色，可不接
# LED ---> P6 (背光控制) 可直接 接VCC，开机亮屏
# SCK ---> P2(SCLK) SCLK 时钟线
# SDI/MOSI ---> P0(MOSI) SDA 数据线
# DO/RS ---> P8 数据命令选择线
# RESET ---> P7 复位线
# CS ---> P3 片选线
# GND ---> GND
# VCC ---> 3.3V
cs = Pin("P3", Pin.OUT_OD)
rst = Pin("P7", Pin.OUT_PP)
rs = Pin("P8", Pin.OUT_PP)
bl = Pin("P6", Pin.OUT_PP) # 背光控制
# 定义横屏/竖屏
USE_HORIZONTAL = True # 定义横屏
IMAGE_INVER = True # 旋转180°
# TFT resolution 240*320
X_MIN_PIXEL = 0
Y_MIN_PIXEL = 0
if USE_HORIZONTAL:
X_MAX_PIXEL = 320 # 定义屏幕宽度
Y_MAX_PIXEL = 240 # 定义屏幕高度
else:
X_MAX_PIXEL = 240 # 定义屏幕宽度
Y_MAX_PIXEL = 320 # 定义屏幕高度
# 常用颜色表 #可去除
RED = 0XF800
GREEN = 0X07E0
BLUE = 0X001F
BLACK = 0X0000
YELLOW = 0XFFE0
WHITE = 0XFFFF
CYAN = 0X07FF
BRIGHT_RED = 0XF810
GRAY1 = 0X8410
GRAY2 = 0X4208
# OpenMV SPI2 总线 8位数据模式
spi = SPI(2, SPI.MASTER, baudrate=int(10000000000/66*0.06), polarity=0, phase=0,bits=8)
# SPI 写命令
def write_command_byte(c):
cs.low()
rs.low()
spi.send(c)
cs.high()
# SPI 写数据
def write_data_byte(c):
cs.low()
rs.high()
spi.send(c)
cs.high()
def write_command(c, *data): #命令数据一起写，先写命令 第二个开始为数据位。如果只写一个，则代表不写数据只写命令。
write_command_byte(c)
if data:
for d in data:
if d > 255:
write_data_byte(d >> 8)
write_data_byte(d&0xFF)
else:
write_data_byte(d)
def write_image(img):
cs.low()
rs.high()
#spi.send(img)
#修改代码的核心##########################################################################
if(True): #全发
for m in img: #把一帧图像的对象取出来，放到帧缓存区中
fbuf=m
for i in range(0,320): #每行每行的发送
spi.send(fbuf[i]>>8) #先发第N行的第I个数据的高八位
spi.send(fbuf[i]&0xFF) #再发低八位
#print(fbuf)
else:#只发一行固定的数据
for i in range(0,320):
spi.send(fbuf[i])
spi.send(fbuf[i+1]&0xFF)
##########################################################################################
cs.high()
def SetXY(xpos, ypos):
write_command(0x2A, xpos>>8, xpos&0XFF)
write_command(0x2B, ypos>>8, ypos&0XFF)
write_command(0x2C)
def SetRegion(xStar, yStar, xEnd, yEnd):
write_command(0x2A, xStar>>8, xStar&0XFF, xEnd>>8, xEnd&0XFF)
write_command(0x2B, yStar>>8, yStar&0XFF, yEnd>>8, yEnd&0XFF)
write_command(0x2C)
# 在指定位置绘制一个点
def DrawPoint(x, y, Color):
SetXY(x, y)
write_data_byte(Color >> 8)
write_data_byte(Color&0XFF)
def ReadPoint(x, y):
data = 0
SetXY(x, y)
write_data_byte(data)
return data
def Clear(Color):
global X_MAX_PIXEL, Y_MAX_PIXEL
SetRegion(0, 0, X_MAX_PIXEL-1 , Y_MAX_PIXEL-1 )
#cs.low()
#rs.high()
for i in range(0, Y_MAX_PIXEL):
for m in range(0, X_MAX_PIXEL):
write_data_byte(Color >> 8)
write_data_byte(Color&0xFF)
def LCDinit():
rst.low()
time.sleep_ms(100)
rst.high()
time.sleep_ms(100)
write_command(0xCB, 0x39, 0x2c, 0x00, 0x34, 0x02)
write_command(0xCF, 0x00, 0XAA, 0XE0)
write_command(0xE8, 0x85, 0x11, 0x78)
write_command(0xEA, 0x00, 0x00)
write_command(0xED, 0x67, 0x03, 0X12, 0X81)
write_command(0xF7, 0x20)
write_command(0xC0, 0x21) # Power control, VRH[5:0]
write_command(0xC1, 0x11) # Power control, SAP[2:0];BT[3:0]
write_command(0xC5, 0x24, 0x3C) # VCM control, 对比度调节
write_command(0xC7, 0xB7) # VCM control2, --
# Memory Data Access Control
if USE_HORIZONTAL: # //C8 //48 68竖屏//28 E8 横屏
if IMAGE_INVER:
write_command(0x36, 0xE8) # 从右到左 e8/68
else:
write_command(0x36, 0x28) # 从左到右 28
else:
if IMAGE_INVER:
write_command(0x36, 0xC8) # 从下到上刷
else:
write_command(0x36, 0x48) # 从上到下刷
global X_MAX_PIXEL, Y_MAX_PIXEL
SetRegion(0, 0, X_MAX_PIXEL - 1, Y_MAX_PIXEL - 1)
# Interface Pixel Format
write_command(0x3A, 0x55)
write_command(0xB1, 0x00, 0x18)
write_command(0xB6, 0x08, 0x82, 0x27) # Display Function Control
write_command(0xF2, 0x00) # 3Gamma Function Disable
write_command(0x26, 0x01) # Gamma curve selected
write_command(0xB7, 0x06)
# set gamma
write_command(0xE0, 0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1, 0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00)
write_command(0XE1, 0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1, 0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F)
write_command(0x11) # sleep_ms Exit
time.sleep_ms(120)
# Display On
write_command(0x29)
write_command(0x2C)
bl.high() # 拉背光
def display(img):
write_command(0x2C)
write_image(img)
import sensor, image
sensor.reset() # Initialize the camera sensor.
sensor.set_pixformat(sensor.RGB565) # or sensor.GRAYSCALE
sensor.set_framesize(sensor.QVGA) # Special 128x160 framesize for LCD Shield.
LCDinit() # Initialize the lcd screen.
Clear(BLUE)
#DrawPoint(50, 50, RED)
display(sensor.snapshot())
while(True):
pass
display(sensor.snapshot()) # Take a picture and display the image.
#print(sensor.snapshot())
最后去掉注释和无用的函数，包装成函数库：
#函数名： myLCD.py 要把这个函数和主函数一起放在OpenMV的根文件中（也就是U盘）才可以互相调用。
import time
from pyb import Pin, SPI
cs = Pin("P3", Pin.OUT_OD)
rst = Pin("P7", Pin.OUT_PP)
rs = Pin("P8", Pin.OUT_PP)
bl = Pin("P6", Pin.OUT_PP) # 背光控制
spi = SPI(2, SPI.MASTER, baudrate=int(10000000000/66*0.06), polarity=0, phase=0,bits=8)
# SPI 写命令
def write_command_byte(c):
cs.low()
rs.low()
spi.send(c)
cs.high()
# SPI 写数据
def write_data_byte(c):
cs.low()
rs.high()
spi.send(c)
cs.high()
def write_command(c, *data): #命令数据一起写，先写命令 第二个开始为数据位。如果只写一个，则代表不写数据只写命令。
write_command_byte(c)
if data:
for d in data:
if d > 255:
write_data_byte(d >> 8)
write_data_byte(d&0xFF)
else:
write_data_byte(d)
def write_image(img):
cs.low()
rs.high()
fbuf = bytearray(320)
for m in img: #把一帧图像的对象取出来，放到帧缓存区中
fbuf=m
for i in range(0,320): #每行每行的发送
spi.send(fbuf[i]>>8) #先发第N行的第I个数据的高八位
spi.send(fbuf[i]&0xFF) #再发低八位
cs.high()
def SetRegion(xStar, yStar, xEnd, yEnd):
write_command(0x2A, xStar>>8, xStar&0XFF, xEnd>>8, xEnd&0XFF)
write_command(0x2B, yStar>>8, yStar&0XFF, yEnd>>8, yEnd&0XFF)
write_command(0x2C)
def LCDinit():
rst.low()
time.sleep_ms(100)
rst.high()
time.sleep_ms(100)
write_command(0xCB, 0x39, 0x2c, 0x00, 0x34, 0x02)
write_command(0xCF, 0x00, 0XAA, 0XE0)
write_command(0xE8, 0x85, 0x11, 0x78)
write_command(0xEA, 0x00, 0x00)
write_command(0xED, 0x67, 0x03, 0X12, 0X81)
write_command(0xF7, 0x20)
write_command(0xC0, 0x21) # Power control, VRH[5:0]
write_command(0xC1, 0x11) # Power control, SAP[2:0];BT[3:0]
write_command(0xC5, 0x24, 0x3C) # VCM control, 对比度调节
write_command(0xC7, 0xB7) # VCM control2, --
write_command(0x36, 0xE8)
X_MIN_PIXEL = 0
Y_MIN_PIXEL = 0
X_MAX_PIXEL = 320 # 定义屏幕宽度
Y_MAX_PIXEL = 240 # 定义屏幕高度
SetRegion(0, 0, X_MAX_PIXEL - 1, Y_MAX_PIXEL - 1)
write_command(0x3A, 0x55)
write_command(0xB1, 0x00, 0x18)
write_command(0xB6, 0x08, 0x82, 0x27) # Display Function Control
write_command(0xF2, 0x00) # 3Gamma Function Disable
write_command(0x26, 0x01) # Gamma curve selected
write_command(0xB7, 0x06)
write_command(0xE0, 0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1, 0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00)
write_command(0XE1, 0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1, 0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F)
write_command(0x11) # sleep_ms Exit
time.sleep_ms(120)
write_command(0x29)
write_command(0x2C)
bl.high() # 拉背光
def LCDdisplay(img):
write_command(0x2C)
write_image(img)
在其他函数中调用即可
# Untitled - By: 周四 4月 22 2021
import sensor, image, time
from myLCD import LCDinit,LCDdisplay
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)
clock = time.clock()
LCDinit()
while(True):
img = sensor.snapshot()
LCDdisplay(img)
实际拍到的：
摄像头传回来让LCD显示出来的
实际设想头拍到的：
