§01 ST7302电子屏

一、背景介绍

这款 ST7302 是从TB购买到的，下面对它的特性进行测试，为之后应用积累经验。

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测试平台采用 ESP32模块转接板 利用它的SPI接口来测试电子屏的功能。这个模块转接板具有硬件和软件SPI接口。应用HSPI1，对应测试模块上的GPIO12，13，14，另外再给复位和数据分配IO，这是对应的分配方案。

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二、搭建测试电路

在面包板上搭建测试电路。这是器件数据手册给出的管脚功能描述。

三、测试程序

from machine                import Pin,SPI
import timelcd_spi = SPI(1, 1000000)
lcd_dc = Pin(15, Pin.OUT)
lcd_cs = Pin(2, Pin.OUT)
lcd_res = Pin(27, Pin.OUT)lcd_cs.on()
lcd_dc.on()
lcd_res.on()def LCDWriteBus(dat):lcd_cs.off()lcd_spi.write(bytes([dat]))lcd_cs.on()def LCDWriteData8(dat):LCDWriteBus(dat)def LCDWriteData(dat):datbyte = dat.to_bytes(2, 1)LCDWriteData8(datbyte[0])LCDWriteData8(datbyte[1])def LCDWriteReg(dat):lcd_dc.off()LCDWriteBus(dat)lcd_dc.on()def LCDAddressSet(x1,y1,x2,y2):LCDWriteReg(0x2a)LCDWriteData8(x1+0x19)LCDWriteData8(x2+0x19)LCDWriteReg(0x2b)LCDWriteData8(y1)LCDWriteData8(y2)LCDWriteReg(0x2c)def LCDInit():lcd_res.off()time.sleep_ms(100)lcd_res.on()time.sleep_ms(400)LCDWriteReg(0x38)LCDWriteReg(0xeb)LCDWriteData8(0x02)LCDWriteReg(0xd7)LCDWriteData8(0x68)LCDWriteReg(0xd1)LCDWriteData8(0x01)LCDWriteReg(0xc0)LCDWriteData8(0x80)LCDWriteReg(0xc1)LCDWriteData8(0x28)LCDWriteData8(0x28)LCDWriteData8(0x28)LCDWriteData8(0x28)LCDWriteData8(0x14)LCDWriteData8(0x00)LCDWriteReg(0xc2)LCDWriteData8(0x00)LCDWriteData8(0x00)LCDWriteData8(0x00)LCDWriteData8(0x00)LCDWriteReg(0xcb)LCDWriteData8(0x14)LCDWriteReg(0xb4)LCDWriteData8(0xe5)LCDWriteData8(0x77)LCDWriteData8(0xf1)LCDWriteData8(0xff)LCDWriteData8(0xff)LCDWriteData8(0x4f)LCDWriteData8(0xf1)LCDWriteData8(0xff)LCDWriteData8(0xff)LCDWriteData8(0x4f)LCDWriteReg(0x11)time.sleep_ms(100)LCDWriteReg(0xc7)LCDWriteData8(0xa6)LCDWriteData8(0xe9)LCDWriteReg(0xb0)LCDWriteData8(0x64)LCDWriteReg(0x36)LCDWriteData8(0x00)LCDWriteReg(0x3a)LCDWriteData8(0x11)LCDWriteReg(0xb9)LCDWriteData8(0x23)LCDWriteReg(0xb8)LCDWriteData8(0x09)LCDWriteReg(0x2a)LCDWriteData8(0x05)LCDWriteData8(0x36)LCDWriteReg(0x2b)LCDWriteData8(0x00)LCDWriteData8(0xc7)LCDWriteReg(0xd0)LCDWriteData8(0x1f)LCDWriteReg(0x29)LCDWriteReg(0xb9)LCDWriteData8(0xe3)time.sleep_ms(100)LCDWriteReg(0xb9)LCDWriteData8(0x23)LCDWriteReg(0x72)LCDWriteData8(0x00)LCDWriteReg(0x39)LCDWriteReg(0x2a)LCDWriteReg(0x19)LCDWriteData8(0x23)LCDWriteReg(0x2b)LCDWriteData8(0)LCDWriteData8(0x7c)LCDWriteData8(0x2c)time.sleep_ms(120)def LCDFill(xsta, ysta, xend, yend, color):LCDAddressSet(xsta, ysta, xend-1, yend-1)for _ in range(5000):LCDWriteData8(color)LCDInit()
LCDFill(0,0,10,0x7c, 0xf0)buf = bytes([0x55, 0xa0])count = 0
while True:count += 1time.sleep_ms(100)