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系列文章：
【从0到1搭建LoRa物联网】1、LoRa物联网的架构
【从0到1搭建LoRa物联网】2、终端设备开发方式
【从0到1搭建LoRa物联网】3、国产LoRa终端ASR6505软硬件
【从0到1搭建LoRa物联网】4、国产LoRa终端ASR6505普通GPIO
【从0到1搭建LoRa物联网】5、国产LoRa终端ASR6505驱动DHT11
【从0到1搭建LoRa物联网】6、国产LoRa终端ASR6505 I2C接口
STM8L15x有LCD控制器外设，不需要使用额外的芯片，可以直接驱动段式LCD。ASR6505预留了最大4COM、18SEG的LCD接口，即就是开发板最右边的接口。
软件来选择VLCD的电源，如果使用内部供电，则需要VLCD引脚断开（P3跳线帽断开），反之闭合。
ASR6505 LCD相关引脚与STM8L对应关系如下：
| ASR6505 Pin Name | STM8 Pin Name |
|---|---|
| SEG17 | PG7(SEG35) |
| SEG16 | PD6(SEG20) |
| SEG15 | PD5(SEG19) |
| SEG14 | PD4(SEG18) |
| SEG13 | PF7(SEG43) |
| SEG12 | PF6(SEG42) |
| SEG11 | PF5(SEG41) |
| SEG10 | PF4(SEG40) |
| SEG9 | PB7(SEG17) |
| SEG8 | PB6(SEG16) |
| SEG7 | PB5(SEG15) |
| SEG6 | PB4(SEG14) |
| SEG5 | PD3(SEG9) |
| SEG4 | PD2(SEG8) |
| SEG3 | PD0(SEG7) |
| SEG2 | PE5(SEG6) |
| SEG1 | PE4(SEG5) |
| SEG0 | PE3(SEG4) |
| COM3 | PD1(COM3) |
| COM2 | PA6(COM2) |
| COM1 | PA5(COM1) |
| COM0 | PA4(COM0) |
参数：Bias偏置电压是1/3，Duty占空比是1/4，需要4个COM口和12个SEG口。
连接：ASR6505对应连接LCD也是用COM0-COM3（对应LCD的Pin1-Pin4），SEG0-SEG12（对应LCD的Pin5-Pin16）。
由上面的图可知，连接LCD需要ASR6505的SEG0-SEG11，对应到STM8L上面就是SEG4-SEG9、SEG14-SEG17、SEG40-SEG41，共12个SEG口,在下图在用红圈标了出来。
查看LCD规格书可知，点亮第一个“点”需要往对应的缓存（LCD_RAM）写1，下面是STM8L的LCD_RAM表和段式LCD的映射表：
void LCD_PeriphInit(void)
{
CLK_PeripheralClockConfig(CLK_Peripheral_LCD, ENABLE);//LCD驱动时钟门控使能
LCD_DeInit( );//LCD相关寄存器恢复初值
LCD_Init(LCD_Prescaler_4, LCD_Divider_16,//LCD驱动初始化，LCD刷新频率
LCD_Duty_1_4, LCD_Bias_1_3,//1/4DUTY 1/3BIAS，看屏幕参数
LCD_VoltageSource_Internal);//选择LCD驱动电源，外部或内部
LCD_PortMaskConfig(LCD_PortMaskRegister_0, 0xF0); //SEG4-7
LCD_PortMaskConfig(LCD_PortMaskRegister_1, 0xC3); //SEG8-9,SEG14-15
LCD_PortMaskConfig(LCD_PortMaskRegister_2, 0x3F); //SEG16-21
LCD_PortMaskConfig(LCD_PortMaskRegister_3, 0x00); //NONE
LCD_PortMaskConfig(LCD_PortMaskRegister_4, 0x00); //MONE
LCD_PortMaskConfig(LCD_PortMaskRegister_5, 0x0F); //SEG40-43
LCD_ContrastConfig(LCD_Contrast_3V3);//配置对比度
LCD_DeadTimeConfig(LCD_DeadTime_0); //设置死区时间
LCD_PulseOnDurationConfig(LCD_PulseOnDuration_5);// 配置LCD脉冲持续时间
LCD_HighDriveCmd(ENABLE);
LCD_Cmd(ENABLE);
}
void LCD_Display(void)
{
//对显示缓冲区操作，要结合液晶说明书
static uint8_t i=0;
i++;
if(i>=255)
{
i=0;
}
if(i%2)
{
LCD_WriteRAM(LCD_RAMRegister_0, 0x30|0xC0|0x03|0x00|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_1, 0x00|0x00|0x03|0xC0|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_2, 0x00|0x00|0x00|0x00|0x03|0x00);
LCD_WriteRAM(LCD_RAMRegister_4, 0x03|0x0C|0x30|0x00|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_5, 0x00|0x00|0x00|0x0C|0x30|0x00);
LCD_WriteRAM(LCD_RAMRegister_7, 0x30|0xC0|0x00|0x00|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_8, 0x00|0x00|0x03|0xC0|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_9, 0x00|0x00|0x00|0x00|0x03|0x00);
LCD_WriteRAM(LCD_RAMRegister_11,0x03|0x0c|0x30|0x00|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_12,0x00|0x00|0x00|0x0C|0x30|0x00);
LCD_WriteRAM(LCD_RAMRegister_15,0x00|0x00|0x00|0x00|0x00|0x30);
LCD_WriteRAM(LCD_RAMRegister_17,0x00|0x00|0x00|0x00|0x00|0x30);
LCD_WriteRAM(LCD_RAMRegister_19,0x00|0x00|0x00|0x00|0x00|0x30);
LCD_WriteRAM(LCD_RAMRegister_21,0x00|0x00|0x00|0x00|0x00|0x30);
}
else
{
LCD_WriteRAM(LCD_RAMRegister_0, 0x20|0xC0|0x03|0x00|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_1, 0x00|0x00|0x03|0x80|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_2, 0x00|0x00|0x00|0x00|0x01|0x00);
LCD_WriteRAM(LCD_RAMRegister_4, 0x00|0x08|0x20|0x00|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_5, 0x00|0x00|0x00|0x0C|0x30|0x00);
LCD_WriteRAM(LCD_RAMRegister_7, 0x20|0x40|0x00|0x00|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_8, 0x00|0x00|0x02|0x80|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_9, 0x00|0x00|0x00|0x00|0x02|0x00);
LCD_WriteRAM(LCD_RAMRegister_11,0x00|0x08|0x20|0x00|0x00|0x00);
LCD_WriteRAM(LCD_RAMRegister_12,0x00|0x00|0x00|0x00|0x20|0x00);
LCD_WriteRAM(LCD_RAMRegister_15,0x00|0x00|0x00|0x00|0x00|0x10);
LCD_WriteRAM(LCD_RAMRegister_17,0x00|0x00|0x00|0x00|0x00|0x30);
LCD_WriteRAM(LCD_RAMRegister_19,0x00|0x00|0x00|0x00|0x00|0x30);
LCD_WriteRAM(LCD_RAMRegister_21,0x00|0x00|0x00|0x00|0x00|0x30);
}
}
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