STM8L的LCD接口详解及驱动程序 -

/****************************************************************************************
*开发环境:IAR for stm8 v6.5.3
*硬件平台:STM8L-DISCOVERY
*功能说明:使用STM8L-DISCOVERY液晶屏显示一串6位数字
*作者：茗风
****************************************************************************************/
#include"iostm8l152c6.h"
#include"stdint.h"
/* =========================================================================
LCD MAPPING
=========================================================================
A
_ ----------
COL |_| |\ |J /|
F| H | K |B
_ | \ | / |
COL |_| --G-- --M--
| /| \ |
E| Q | N |C
_ | / |P \|
DP |_| -----------
D
*/
#define a 0x01
#define b 0x02
#define c 0x04
#define d 0x08
#define e 0x10
#define f 0x20
#define g 0x40
#define m 0x80
const uint8_t LCD_Tab[10] = {
a + b + c + d + e + f, // Displays "0"
b + c, // Displays "1"
a + b + m + g + e + d, // Displays "2"
a + b + m + g + c + d, // Displays "3"
f + g + m + b + c, // Displays "4"
a + f + g + m + c +d, // Displays "5"
a + f + e + d + c + g + m , // Displays "6"
a + b + c, // Displays "7"
a + b + c + d + e + f + g + m, // Displays "8"
a + b + c + d + f + g + m // Displays "9"
};
/******************************************************************************************************
* 名称：void LCD_Config(void)
* 功能：配置DAC,禁用DMA,不使用TIM4触发,也不用软件触发,写入DHR的数据被立即送入DOR寄存器,
* 立即输出对应电压
* 入口参数：无
* 出口参数：无
* 说明：STM8L152C6属于中等容量MCU,只有一路DAC输出,输出引脚为PF0
* 范例：无
******************************************************************************************************/
void LCD_Config(void)
{
//------打开LCD/RTC时钟------
CLK_PCKENR2_PCKEN22=1;//打开RTC时钟,LCD刷新频率与此时钟有关
CLK_PCKENR2_PCKEN23=1;//打开LCD时钟,读写LCD寄存器用到此时钟
//---选择LSE作为RTC时钟---
CLK_CRTCR_RTCSEL0=0;
CLK_CRTCR_RTCSEL1=0;
CLK_CRTCR_RTCSEL2=0;
CLK_CRTCR_RTCSEL3=1;
/* 0000: No clock selected
0001: HSI clock used as RTC clock source
0010: LSI clock used as RTC clock source
0100: HSE clock used as RTC clock source
1000: LSE clock used as RTC clock sourc*/
//----设置RTC时钟分频值----
CLK_CRTCR_RTCDIV0=0;
CLK_CRTCR_RTCDIV1=0;
CLK_CRTCR_RTCDIV2=0;
/*000: RTC clock source/1
001: RTC clock source /2
010: RTC clock source /4
011: RTC clock source /8
100: RTC clock source /16
101: RTC clock source /32
110: RTC clock source /64
111: RTC clock source /128*/
//----设置LCD预分频值----
LCD_FRQ_PS0=0;// 2^PS[3:0]
LCD_FRQ_PS1=0;//分频值为1
LCD_FRQ_PS2=0;
LCD_FRQ_PS3=0;
//----设置LCD分频值----
LCD_FRQ_DIV0=1;//DIV[3:0]+16
LCD_FRQ_DIV1=1;//分频值为15+16=31
LCD_FRQ_DIV2=1;
LCD_FRQ_DIV3=1;
//以上分频值的设置,最为了得到适合的LCD的刷新频率,如果增大分频值,会导致
//LCD刷新频率变低,会看到LCD显示出现闪烁
//比如,我们将PS[3:0]设置为0011,会看到液晶闪烁
//----1/4 duty----
LCD_CR1_DUTY0=1;//1/4 duty
LCD_CR1_DUTY1=1;
/* Duty ratio selection
00: Static duty
01: 1/2 duty
10: 1/3 duty
11: 1/4 duty */
//----1/3 bias----
LCD_CR1_B2=0;//1/3 bias
/* 0: 1/3 bias
1: 1/2 bias */
//----内部电压源----
LCD_CR2_VSEL=0;
//----打开引脚的SEG功能----
// LCD_PM0=0xFF;//头文件这个地方定义错误,无法直接向LCD_PM0写入数据
// LCD_PM1=0xFF;//PM0寄存器定义错误,导致PM1也无法直接写入
// LCD_PM2=0xFF;//PM0寄存器定义错误,导致PM2也无法直接写入
*((uint8_t *)0x5404)=0xFF;//直接向LCD_PM0寄存器的地址写入数据
*((uint8_t *)0x5405)=0xFF;//直接向LCD_PM1寄存器的地址写入数据
*((uint8_t *)0x5406)=0xFF;//直接向LCD_PM2寄存器的地址写入数据
//----To set contrast to mean value----
LCD_CR2_CC0=0;//对比度
LCD_CR2_CC1=1;
LCD_CR2_CC2=0;
/* 000: VLCD0 2.6V
001: VLCD1 2.7V
010: VLCD2 2.8V
011: VLCD3 2.9V
100: VLCD4 3.0V
101: VLCD5 3.1V
110: VLCD6 3.2V
111: VLCD7 */
//----Dead time 0----
LCD_CR3_DEAD0=0;//no dead time
LCD_CR3_DEAD1=0;
LCD_CR3_DEAD2=0;
//----LCD_PulseOnDuration_1----
LCD_CR2_PON0=1;
LCD_CR2_PON1=0;
LCD_CR2_PON2=0;
/* 000: 0 CLKps pulses
001: 1 CLKps pulses
010: 2 CLKps pulses
011: 3 CLKps pulses
100: 4 CLKps pulses
101: 5 CLKps pulses
110: 6 CLKps pulses
111: 7 CLKps pulses */
//----Enable LCD peripheral----
LCD_CR3_LCDEN=1;
}
/******************************************************************************************************
* 名称：LCD_DisplayNum(uint8_t number)
* 功能：控制段式液晶屏的数字显示部分
* 入口参数：number:要显示的数字
* 出口参数：无
* 说明：根据数字的长度，判断要显示的长度,长度大于6位,只显示后六位
* 范例：无
******************************************************************************************************/
void LCD_DisplayNum(uint32_t number)
{
uint8_t cnts=0,tmp=0;
if(number<10)cnts=1;
else if(number<100)cnts=2;
else if(number<1000)cnts=3;
else if(number<10000)cnts=4;
else if(number<100000)cnts=5;
else if(number<(uint32_t) 1000000)cnts=6;
else cnts=6;
//判断需要显示数字的长度，确定在LCD屏上需要的位数
switch(cnts)
{
case 6:
tmp = LCD_Tab[number%1000000/100000];
((tmp&m)==0)?(LCD_RAM0&=~0x02):(LCD_RAM0 |=0x02) ;
((tmp&e)==0)?(LCD_RAM0&=~0x01):(LCD_RAM0 |=0x01) ;
((tmp&g)==0)?(LCD_RAM2&=~0x80):(LCD_RAM2 |=0x80) ;
((tmp&b)==0)?(LCD_RAM2&=~0x40):(LCD_RAM2 |=0x40) ;
((tmp&f)==0)?(LCD_RAM6&=~0x08):(LCD_RAM6 |=0x08) ;
((tmp&a)==0)?(LCD_RAM6&=~0x04):(LCD_RAM6 |=0x04) ;
((tmp&c)==0)?(LCD_RAM3&=~0x20):(LCD_RAM3 |=0x20) ;
((tmp&d)==0)?(LCD_RAM3&=~0x10):(LCD_RAM3 |=0x10) ;
case 5:
tmp = LCD_Tab[number%100000/10000];
((tmp&m)==0)?(LCD_RAM0&=~0x08):(LCD_RAM0 |=0x08) ;
((tmp&e)==0)?(LCD_RAM0&=~0x04):(LCD_RAM0 |=0x04) ;
((tmp&g)==0)?(LCD_RAM2&=~0x20):(LCD_RAM2 |=0x20) ;
((tmp&b)==0)?(LCD_RAM2&=~0x10):(LCD_RAM2 |=0x10) ;
((tmp&f)==0)?(LCD_RAM6&=~0x02):(LCD_RAM6 |=0x02) ;
((tmp&a)==0)?(LCD_RAM6&=~0x01):(LCD_RAM6 |=0x01) ;
((tmp&c)==0)?(LCD_RAM3&=~0x80):(LCD_RAM3 |=0x80) ;
((tmp&d)==0)?(LCD_RAM3&=~0x40):(LCD_RAM3 |=0x40) ;
case 4:
tmp = LCD_Tab[number%10000/1000];
((tmp&m)==0)?(LCD_RAM0&=~0x20):(LCD_RAM0 |=0x20) ;
((tmp&e)==0)?(LCD_RAM0&=~0x10):(LCD_RAM0 |=0x10) ;
((tmp&g)==0)?(LCD_RAM2&=~0x08):(LCD_RAM2 |=0x08) ;
((tmp&b)==0)?(LCD_RAM2&=~0x04):(LCD_RAM2 |=0x04) ;
((tmp&f)==0)?(LCD_RAM5&=~0x80):(LCD_RAM5 |=0x80) ;
((tmp&a)==0)?(LCD_RAM5&=~0x40):(LCD_RAM5 |=0x40) ;
((tmp&c)==0)?(LCD_RAM4&=~0x02):(LCD_RAM4 |=0x02) ;
((tmp&d)==0)?(LCD_RAM4&=~0x01):(LCD_RAM4 |=0x01) ;
case 3:
tmp = LCD_Tab[number%1000/100];
((tmp&m)==0)?(LCD_RAM0&=~0x80):(LCD_RAM0 |=0x80) ;
((tmp&e)==0)?(LCD_RAM0&=~0x40):(LCD_RAM0 |=0x40) ;
((tmp&g)==0)?(LCD_RAM2&=~0x02):(LCD_RAM2 |=0x02) ;
((tmp&b)==0)?(LCD_RAM2&=~0x01):(LCD_RAM2 |=0x01) ;
((tmp&f)==0)?(LCD_RAM5&=~0x20):(LCD_RAM5 |=0x20) ;
((tmp&a)==0)?(LCD_RAM5&=~0x10):(LCD_RAM5 |=0x10) ;
((tmp&c)==0)?(LCD_RAM4&=~0x08):(LCD_RAM4 |=0x08) ;
((tmp&d)==0)?(LCD_RAM4&=~0x04):(LCD_RAM4 |=0x04) ;
case 2:
tmp = LCD_Tab[number%100/10];
((tmp&m)==0)?(LCD_RAM1&=~0x02):(LCD_RAM1 |=0x02) ;
((tmp&e)==0)?(LCD_RAM1&=~0x01):(LCD_RAM1 |=0x01) ;
((tmp&g)==0)?(LCD_RAM1&=~0x80):(LCD_RAM1 |=0x80) ;
((tmp&b)==0)?(LCD_RAM1&=~0x40):(LCD_RAM1 |=0x40) ;
((tmp&f)==0)?(LCD_RAM5&=~0x08):(LCD_RAM5 |=0x08) ;
((tmp&a)==0)?(LCD_RAM5&=~0x04):(LCD_RAM5 |=0x04) ;
((tmp&c)==0)?(LCD_RAM4&=~0x20):(LCD_RAM4 |=0x20) ;
((tmp&d)==0)?(LCD_RAM4&=~0x10):(LCD_RAM4 |=0x10) ;
case 1:
tmp = LCD_Tab[number%10];
((tmp&m)==0)?(LCD_RAM1&=~0x08):(LCD_RAM1 |=0x08) ;
((tmp&e)==0)?(LCD_RAM1&=~0x04):(LCD_RAM1 |=0x04) ;
((tmp&g)==0)?(LCD_RAM1&=~0x20):(LCD_RAM1 |=0x20) ;
((tmp&b)==0)?(LCD_RAM1&=~0x10):(LCD_RAM1 |=0x10) ;
((tmp&f)==0)?(LCD_RAM5&=~0x02):(LCD_RAM5 |=0x02) ;
((tmp&a)==0)?(LCD_RAM5&=~0x01):(LCD_RAM5 |=0x01) ;
((tmp&c)==0)?(LCD_RAM4&=~0x80):(LCD_RAM4 |=0x80) ;
((tmp&d)==0)?(LCD_RAM4&=~0x40):(LCD_RAM4 |=0x40) ;
break;
default:break;
}
}
void main(void)
{
LCD_Config();
LCD_DisplayNum(201609);
// asm("rim"); //enable interrupts
while(1)
{
asm("wfi");
}
}

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