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本文來源電子發(fā)燒友社區(qū)，作者：李元江，帖子地址：https://bbs.elecfans.com/jishu_2021769_1_1.html

今天來寫一篇關于使用顯示板的帖子。主要完成溫濕度傳感器數(shù)據(jù)采集，把采集到的數(shù)據(jù)顯示到OELD顯示屏，顯示時鐘。

一、硬件介紹

通過查看環(huán)境監(jiān)測板的原理圖，發(fā)現(xiàn)該板子主要有兩個種資源：12864OLED顯示屏，兩個模擬按鍵。兩個模擬按鍵分別按下時，因為電阻分壓，在SWITCH端的電壓都一樣，根據(jù)測量這個SWITCH端電壓值，可以讀取到按鍵的狀態(tài)。

其中OLED兼容兩種通信接口SPI和I2C,這里我選擇使用I2C。

它們使用主控的GPIO口分別為：AHT20溫濕度傳感器 SDA --》 GPIO13 可復用為I2C0_SDASCL --》 GPIO14 可復用為I2C0_SCL模擬按鍵ADC --》 GPIO05 可復用為ADC2

二、軟件設計

1、新建文件

在wifi-iot/app目錄下，新建OLED文件夾，存放與顯示板和環(huán)境監(jiān)測板相關的代碼。所含文件如下所示。

其中aht20.c、aht20.h、envrionment_demo.c。是從上一篇帖子移植過來的，主要跟環(huán)境監(jiān)測板有關。oled_demo.c 、oled_fonts.h 、 oled_ssd1306.h 、oled_ssd1306.c從許思維老師例程中移植過來。timeconv.c timeconv.h與時間轉換有關。

2、timeconv.c

該c文件主要跟時間戳轉換有關，在這個例程中，每一秒時間戳數(shù)值加1，然后再把時間戳轉換為北京時間即可到的時間戳對應的北京時間。

#include "timeconv.h"
#include
#include
?
static uint8_t month_day[12]={31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; //平年
static uint8_t Leap_month_day[12]={31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; //閏年
const uint16_t dayPerYear[4] = {365, 365, 365, 366};
// 判斷是否是閏年
// year: 需要判斷的年
// return：1：閏年
// 0: 平年
uint8_t isLeapYear(uint16_t year)
{
uint8_t res=0;
if(year%4 == 0) // 能夠被4整除
{
if((year%100 == 0) && (year%400 != 0)) //能夠被100整除，但是不能夠被400整除
{
res = 0;
}
else
{
res =1;
}
}
return res;
}
// 將Unix時間戳轉換為北京時間
// unixTime: 需要判斷的Unix時間戳
// *tempBeijing:返回的北京時間
// return：none
// note：沒對輸入?yún)?shù)正確性做判斷
void covUnixTimeStp2Beijing(uint32_t unixTime, rtc_time_t *tempBeijing)
{
uint32_t totleDaynum=0, totleSecNum=0;
uint16_t remainDayofYear;
uint8_t *pr, tempYear=0;
totleDaynum = (uint32_t)unixTime/(((uint32_t)24*60*60)); //總天數(shù)(注意加括號)
totleSecNum = (uint32_t)unixTime%((uint32_t)24*60*60); //當天剩余的秒速
memset(tempBeijing, 0x00, sizeof(rtc_time_t));
// 1.計算哪一年
tempBeijing->ui8Year = 1970 + (totleDaynum/((uint32_t)FOURYEARDAY))*4;
remainDayofYear = totleDaynum%((uint32_t)FOURYEARDAY)+1;
//Delay_1ms(1000);
while(remainDayofYear > dayPerYear[tempYear])
{
remainDayofYear -= dayPerYear[tempYear];
tempBeijing->ui8Year++;
tempYear++;
}
//2.計算哪一月的哪一天
pr = isLeapYear(tempBeijing->ui8Year)?Leap_month_day:month_day;
while(remainDayofYear > *(pr+tempBeijing->ui8Month))
{
remainDayofYear -= *(pr+tempBeijing->ui8Month);
tempBeijing->ui8Month++;
}
tempBeijing->ui8Month++; //month
tempBeijing->ui8DayOfMonth = remainDayofYear; //day
//3.計算當天時間
tempBeijing->ui8Hour = (totleSecNum)/3600;
tempBeijing->ui8Minute = (totleSecNum%3600)/60; //error：變量搞錯
tempBeijing->ui8Second = (totleSecNum%3600)%60;
//4.時區(qū)調整
tempBeijing->ui8Hour +=TIMEZONE;
if(tempBeijing->ui8Hour>23){
tempBeijing->ui8Hour -= 24;
tempBeijing->ui8DayOfMonth++;
}
}
// 將北京時間轉換為Unix時間戳
// year: 需要判斷的年
// return：Unix時間戳（從1970/1/1 00:00:00 到現(xiàn)在的秒數(shù))
// note：沒對輸入?yún)?shù)正確性做判斷
uint32_t covBeijing2UnixTimeStp(rtc_time_t *beijingTime)
{
uint32_t daynum=0, SecNum=0; //保存北京時間到起始時間的天數(shù)
uint16_t tempYear=1970, tempMonth=0;
//1.年的天數(shù)
while(tempYear < beijingTime->ui8Year)
{
if(isLeapYear(tempYear)){
daynum += 366;
}
else{
daynum += 365;
}
tempYear++;
}
//2.月的天數(shù)
while(tempMonth < beijingTime->ui8Month-1)
{
if(isLeapYear(beijingTime->ui8Year)){ //閏年
daynum += Leap_month_day[tempMonth];
}
else{
daynum += month_day[tempMonth];
}
tempMonth++;
}
//3.天數(shù)
daynum += (beijingTime->ui8DayOfMonth-1);
//4.時分秒
SecNum = daynum*24*60*60; //s
SecNum += beijingTime->ui8Hour*60*60;
SecNum += beijingTime->ui8Minute*60;
SecNum += beijingTime->ui8Second;
//5.時區(qū)調整
SecNum -= TIMEZONE*60*60;
return SecNum;
}

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3.timeconv.h

#ifndef __TIMECONV_H
#define __TIMECONV_H
?
#include
#include
#include
#include "ohos_init.h"
#include "cmsis_os2.h"
#define FOURYEARDAY (((uint32_t)365+365+365+366))//4年一個周期內的總天數(shù)（1970~2038不存在2100這類年份，故暫不優(yōu)化）
#define TIMEZONE (8) //北京時區(qū)調整
?
typedef struct rtc_time_struct
{
uint16_t ui8Year; // 1970~2038
uint8_t ui8Month; // 1~12
uint8_t ui8DayOfMonth;// 1~31
uint8_t ui8Week;
uint8_t ui8Hour; // 0~23
uint8_t ui8Minute; // 0~59
uint8_t ui8Second; // 0~59
}rtc_time_t;
?
uint8_t isLeapYear(uint16_t year);
void covUnixTimeStp2Beijing(uint32_t unixTime, rtc_time_t *tempBeijing);
uint32_t covBeijing2UnixTimeStp(rtc_time_t *beijingTime);
?
#endif /*__TIMECONV_H*/
?

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4、oled_demo.c

該c文件主要是oled顯示屏顯示程序、包括時間轉換顯示、溫濕度顯示。

extern float humidity;
extern float temperature;
static void OledTask(void *arg)
{
rtc_time_t mData;
(void)arg;
?
GpioInit();
?
OledInit();
OledFillScreen(0x00);
while (1) {
static char text[128] = {0};
unsigned short data = 0;
AdcRead(analog_KEY_CHAN_NAME, &data, WIFI_IOT_ADC_EQU_MODEL_4, WIFI_IOT_ADC_CUR_BAIS_DEFAULT, 0);
float voltage = ConvertToVoltage(data);
snprintf(text, sizeof(text), "voltage: %.3f!", voltage);
//OledShowString(0, 5, text, 1);
?
OLED_ShowCHinese(0,3,0);//溫
OLED_ShowCHinese(16,3,2);//度
OledShowChar(32,3,':',2);
sprintf((char *)TimeStr,"%02d",
(uint32_t)temperature);
OledShowString(40,3,(char *)TimeStr,2);
OLED_ShowCHinese(64,3,1);//濕
OLED_ShowCHinese(80,3,2);//度
OledShowChar(96,3,':',2);
sprintf((char *)TimeStr,"%02d",
(uint32_t)humidity);
OledShowString(104,3,(char *)TimeStr,2);
timedata++;
covUnixTimeStp2Beijing(timedata, &mData);
sprintf((char *)TimeStr,"%04d-%02d-%02d",
mData.ui8Year, mData.ui8Month, mData.ui8DayOfMonth);
OledShowString(24,0,(char *)TimeStr,1);
sprintf((char *)TimeStr,"%02d:%02d:%02d",
mData.ui8Hour,mData.ui8Minute,mData.ui8Second);
OledShowString(32,1,(char *)TimeStr,1);
sleep(1);
}
}

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5、oled_ssd1306.c

原來例程上是不能中文的，現(xiàn)在把顯示中文功能加上，但是需要提前使用取模軟件把字取模。

//顯示漢字
void OLED_ShowCHinese(uint8_tx,uint8_ty,uint8_tno)
{
uint8_tt,adder=0;
OledSetPosition(x,y);
for(t=0;t<16;t++)
{
WriteData(Hzk[2*no][t]);
adder+=1;
}
OledSetPosition(x,y+1);
for(t=0;t<16;t++)
{
WriteData(Hzk[2*no+1][t]);
adder+=1;
}
}

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字模數(shù)組

static const unsigned charHzk[][16]={
{0x10,0x60,0x02,0x8C,0x00,0x00,0xFE,0x92,0x92,0x92,0x92,0x92,0xFE,0x00,0x00,0x00},
{0x04,0x04,0x7E,0x01,0x40,0x7E,0x42,0x42,0x7E,0x42,0x7E,0x42,0x42,0x7E,0x40,0x00},/*"溫",0*/
/* (16 X 16 , 宋體 )*/
{0x10,0x60,0x02,0x8C,0x00,0xFE,0x92,0x92,0x92,0x92,0x92,0x92,0xFE,0x00,0x00,0x00},
{0x04,0x04,0x7E,0x01,0x44,0x48,0x50,0x7F,0x40,0x40,0x7F,0x50,0x48,0x44,0x40,0x00},/*"濕",1*/
/* (16 X 16 , 宋體 )*/
{0x00,0x00,0xFC,0x24,0x24,0x24,0xFC,0x25,0x26,0x24,0xFC,0x24,0x24,0x24,0x04,0x00},
{0x40,0x30,0x8F,0x80,0x84,0x4C,0x55,0x25,0x25,0x25,0x55,0x4C,0x80,0x80,0x80,0x00},/*"度",2*/
};

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6、BUILD.gn

BUILD.gn內容為

#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
?
static_library("oled_example") {
sources = [
"oled_demo.c",
"oled_ssd1306.c",
"timeconv.c",
"envrionment_demo.c",
"aht20.c"
]
?
include_dirs = [
"http://utils/native/lite/include",
"http://kernel/liteos_m/components/cmsis/2.0",
"http://base/iot_hardware/inteRFaces/kits/wifiiot_lite",
]
}