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如果使用自己的LCD屏，帧率特别低应该如何调整？
#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=20*1000000, polarity=1, 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)