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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_2026438_1_1.html

上一次帖子，已經(jīng)通過網(wǎng)絡(luò)獲取天氣數(shù)據(jù)，但是還沒顯示到顯示屏上。今天的帖子我寫的是關(guān)于如何取模天氣圖片，并顯示天氣圖標(biāo)和天氣數(shù)據(jù)。

一、ssd1306顯存填充

顯示板使用的OLED驅(qū)動芯片為SSD1306，我們來看看這款芯片的顯存和該顯存填充方式。下面是從SSD1303芯片手冊上的截圖，可以看得出它的顯存是大小為128*64bit的RAM，并且分成為8頁，PAGE0-PAGE7。顯示板像素點(diǎn)大小為128*64,所以一個像素點(diǎn)對應(yīng)RAM中的1bit。

往RAM的某一位寫入1或者0,該位對應(yīng)的像素點(diǎn)就顯示亮點(diǎn)或者不顯示。但是它是按照什么順序?qū)懭霐?shù)據(jù)的。下面也是從芯片手冊上的截圖。

可以看得出RAM填充順序了 ,寫入一個字節(jié)數(shù)據(jù)時，最低位數(shù)據(jù)寫入一頁中最上面那行，最高位寫入一頁中最下面那行。這樣，使用取模軟件取模圖片或者字符時，我們才能知道按照什么順序取模。之后再寫相應(yīng)代碼，按照順序把取模數(shù)據(jù)寫入RAM中。

二、天氣圖標(biāo)取模

首先當(dāng)然是先在網(wǎng)絡(luò)下載我們需要的天氣圖標(biāo)，大小看你像顯示多大區(qū)域的圖標(biāo)，我的是48*48大小圖標(biāo)，在OLED上顯示大小也是48*48。

我使用的是下面這款取模軟件，我覺得圖標(biāo)取模不太好，不知道大家有沒有推薦的。需要根據(jù)SSD1306進(jìn)行取模軟件的設(shè)置。比較重要的是取模方式的選擇，這是跟SSD1306顯示填充順序?qū)?yīng)的，我們需要選擇列行式。其他數(shù)據(jù)點(diǎn)陣選擇48，自定義格式選擇C51。

選擇晴圖標(biāo)，生成如下數(shù)組。

上面的小花就是太陽圖標(biāo)，是有點(diǎn)丑，先湊合用吧。

二、軟件設(shè)計(jì)
1、顯示天氣圖標(biāo)

我們已經(jīng)按照SSD1306顯存填充順序，取模好圖片數(shù)據(jù)，接下來按照順序把數(shù)據(jù)寫入RAM就行了，代碼如下。

typedef enum
{
QINGLOGO =0,
YINGLOGO,
DUOYULOGO,
YULOGO,
LEIYULOGO,
XUELOGO,
}WEATHER_TYPE;
void OLED_ShowWeather(uint8_t x,uint8_t y,WEATHER_TYPE type)
{
unsigned char (*temp)[48];
//if(type ==qinglogo )
//temp=Qing48;
switch(type)
{
case QINGLOGO: temp=Qing48;break;
case YINGLOGO: temp=Yin48;break;
case YULOGO: temp=Yu48;break;
case LEIYULOGO:temp=LeiYu48;break;
case DUOYULOGO:temp=DuoYun48;break;
case XUELOGO: temp=Xue48;break;
default :
temp=Qing48;
break;
}
//OledSetPosition(x,y);
for(uint8_t i=0;i<6;i++){
OledSetPosition(x,y+i);
for(uint8_t j = 0;j<48;j++){
WriteData(temp[i][j]);
}
}
}

復(fù)制代碼

2、按鍵任務(wù)

OLED顯示板上的兩個按鍵，主要用于界面切換、獲取實(shí)時時間、天氣數(shù)據(jù)。增加了按鍵任務(wù)，主要進(jìn)行這兩個按鍵的處理。右邊按鍵，按下后可以切換界面，現(xiàn)在設(shè)置有四個界面。在時間顯示界面按下左鍵，會獲取實(shí)時時間。在天氣顯示界面，按下左鍵會獲取實(shí)時天氣。

#include
#include
#include
#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifiiot_gpio.h"
#include "wifiiot_gpio_ex.h"
#include "wifiiot_pwm.h"
#include "wifiiot_adc.h"
?
#include "oled_ssd1306.h"
?
#defineanalog_KEY_CHAN_NAME WIFI_IOT_ADC_CHANNEL_2
?
typedef enum{
TIMESCREEN=0,
NOWSCREEN,
TOSCREEN,
ATOSCREEN,
} SCREEN_STATUS;
extern SCREEN_STATUS Now_Screen ;
extern SCREEN_STATUS Last_Screen ;
?
typedef enum{
GET_NORMAL =0 ,
GET_PROPRESS,
GET_SUC,
GET_FAIL,
}GET_STATUS;
?
GET_STATUS Get_Status = GET_NORMAL;
GET_STATUS Last_Get_Status = GET_NORMAL;
?
extern void getNtpTime(void);
extern bool getWeather(void);
?
static float ConvertToVoltage(unsigned short data)
{
return (float)data * 1.8 * 4 / 4096; /* adc code equals: voltage/4/1.8*4096*/
}
?
static void KeyTask(void *arg)
{
(void)arg;
unsigned short data = 0;
?
GpioInit();
static bool keyflag = false;
while(1)
{
AdcRead(ANALOG_KEY_CHAN_NAME, &data, WIFI_IOT_ADC_EQU_MODEL_4, WIFI_IOT_ADC_CUR_BAIS_DEFAULT, 0);
float voltage = ConvertToVoltage(data);
?
if((voltage>0.45 && voltage<0.65)&&(!keyflag))
{
keyflag = true;
//OledShowString(16,7,"Sync time...",1);
//getNtpTime();
//OledFillScreen(0);
switch (Now_Screen){
case TIMESCREEN:
//OledShowString(16,7,"Sync time...",1);
Get_Status = GET_PROPRESS;
getNtpTime();
//OledFillScreen(0);
Get_Status = GET_SUC;
break;
case NOWSCREEN:
//OledShowString(0,7,"Get Weather...",1);
Get_Status = GET_PROPRESS;
if(getWeather())
//OledFillScreen(0);
Get_Status = GET_SUC;
else
{
//OledShowString(0,7,"Get fail...",1);
Get_Status = GET_FAIL;
}
break;
case TOSCREEN:
Get_Status = GET_PROPRESS;
if(getWeather())
Get_Status = GET_SUC;
else
{
Get_Status = GET_FAIL;
}
break;
case ATOSCREEN:
Get_Status = GET_PROPRESS;
if(getWeather())
Get_Status = GET_SUC;
else
{
Get_Status = GET_FAIL;
}
break;
?
default:
break;
}
}
else if((voltage>0.9 && voltage<1)&&(!keyflag))
{
keyflag = true;
Now_Screen ++;
if(Now_Screen > ATOSCREEN)
{
Now_Screen = TIMESCREEN;
}
}
?
if((!(voltage>0.45 && voltage<0.65)) && (!(voltage>0.9 && voltage<1))) {
keyflag = false;
}
?
usleep(300000);
}
}
?
static void KeyTaskHandle(void)
{
osThreadAttr_t attr;
attr.name = "KeyTask";
attr.attr_bits = 0U;
attr.cb_mem = NULL;
attr.cb_size = 0U;
attr.stack_mem = NULL;
attr.stack_size = 4096;
attr.priority = osPriorityNormal+2;
?
if (osThreadNew(KeyTask, NULL, &attr) == NULL) {
printf("[KeyTaskHandle] Falied to create KeyTask!n");
}
}
APP_FEATURE_INIT(KeyTaskHandle);

復(fù)制代碼

3、 OLED任務(wù)修改

修改oled_demo.c內(nèi)容。增加頁面切換，獲取時間、天氣數(shù)據(jù)情況提示，顯示天氣數(shù)據(jù)和天氣圖標(biāo)。

typedef enum{
TIMESCREEN=0,
NOWSCREEN,
TOSCREEN,
ATOSCREEN,
} SCREEN_STATUS;
SCREEN_STATUS Now_Screen = TIMESCREEN;
SCREEN_STATUS Last_Screen = TIMESCREEN;
?
typedef enum{
GET_NORMAL =0 ,
GET_PROPRESS,
GET_SUC,
GET_FAIL,
}GET_STATUS;
extern GET_STATUS Get_Status ;
extern GET_STATUS Last_Get_Status ;
?
static uint8_t i=0;
?
static void TimeScreenDisp(void)
{
//OledShow
rtc_time_t mData;
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);
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);
?
if(Get_Status != Last_Get_Status)
{
Last_Get_Status = Get_Status;
switch ( Get_Status)
{
case GET_NORMAL:
break;
case GET_PROPRESS:
OledShowString(16,7,"Sync time...",1);
break;
case GET_SUC:
OledClearString(16,7,"Sync time...",1);
OledShowString(16,7,"Sync Suc...",1);
break;
case GET_FAIL:
OledClearString(16,7,"Sync time...",1);
OledShowString(16,7,"Sync fail...",1);
break;
default:
break;
}
}
}
?
static void DispWeather(uint8_t x, uint8_t y ,uint8_t code){
switch(code)
{
case 0:
case 1:
case 2:
case 3:
OLED_ShowWeather(x,y,QINGLOGO);
break;
case 4:
case 5:
case 6:
case 7:
case 8:
OLED_ShowWeather(x,y,DUOYULOGO);
break;
case 9:
case 10:
OLED_ShowWeather(x,y,YINGLOGO);
break;
case 11:
case 12:
?
OLED_ShowWeather(x,y,LEIYULOGO);
break;
case 13:
case 14:
case 15:
case 16:
case 17:
case 18:
case 19:
OLED_ShowWeather(x,y,YULOGO);
break;
case 20:
case 21:
case 22:
case 23:
case 24:
case 25:
OLED_ShowWeather(x,y,XUELOGO);
break;
case 30:
//OLED_ShowWeather(x,y,YULOGO);
//break;
default:
OLED_ShowWeather(x,y,QINGLOGO);
break;
}
?
}
?
extern weather weatherValue;
static voidWeatherDisp(SCREEN_STATUS Screen){
switch (Screen)
{
case NOWSCREEN:
DispWeather(5, 1 ,weatherValue.nowcode);
OLED_ShowCHinese(56,0,9);//今
OLED_ShowCHinese(72,0,12);//天
sprintf((char *)DispStr,"%02d",
(uint32_t)weatherValue.nowtemp);
OledShowString(60,5,(char *)DispStr,2);
OLED_ShowCHinese(76,5,13);//天
sprintf((char *)DispStr,"%02d/%02d",
(uint32_t)weatherValue.low[Screen-1],(uint32_t)weatherValue.high[Screen-1]);
OledShowString(60,3,(char *)DispStr,2);
sprintf((char *)DispStr,"%d%%",
(uint32_t)weatherValue.humi[Screen-1]);
OledShowString(100,5,(char *)DispStr,2);
break;
case TOSCREEN:
DispWeather(5, 1 ,weatherValue.code[Screen-1]);
OLED_ShowCHinese(56,0,10);//明
OLED_ShowCHinese(72,0,12);//天
sprintf((char *)DispStr,"%02d/%02d",
(uint32_t)weatherValue.low[Screen-1],(uint32_t)weatherValue.high[Screen-1]);
OledShowString(60,3,(char *)DispStr,2);
sprintf((char *)DispStr,"%d%%",
(uint32_t)weatherValue.humi[Screen-1]);
OledShowString(70,5,(char *)DispStr,2);
break;
case ATOSCREEN:
DispWeather(5, 1 ,weatherValue.code[Screen-1]);
OLED_ShowCHinese(56,0,11);//后
OLED_ShowCHinese(72,0,12);//天
sprintf((char *)DispStr,"%02d/%02d",
(uint32_t)weatherValue.low[Screen-1],(uint32_t)weatherValue.high[Screen-1]);
OledShowString(60,3,(char *)DispStr,2);
sprintf((char *)DispStr,"%d%%",
(uint32_t)weatherValue.humi[Screen-1]);
OledShowString(70,5,(char *)DispStr,2);
break;
default:
break;
}
if(Get_Status != Last_Get_Status)
{
Last_Get_Status = Get_Status;
switch ( Get_Status)
{
case GET_NORMAL:
break;
case GET_PROPRESS:
OledShowString(0,7,"Get Weather...",1);
break;
case GET_SUC:
OledClearString(0,7,"Get Weather...",1);
OledShowString(0,7,"Get Suc...",1);
i=0;
break;
case GET_FAIL:
OledClearString(0,7,"Get Weather...",1);
OledShowString(0,7,"Get fail...",1);
i=0;
break;
default:
break;
}
}
}
static void OledTask(void *arg)
{
(void)arg;
GpioInit();
OledInit();
OledFillScreen(0x00);
while (1) {
if(Now_Screen != Last_Screen)
{
Last_Screen = Now_Screen;
OledFillScreen(0);
Get_Status = GET_NORMAL;
Last_Get_Status = GET_NORMAL;
i=0;
}
?
if((Get_Status == GET_FAIL) ||(Get_Status == GET_SUC))
{
i++;
if(i > 20)
{
Get_Status = GET_NORMAL;
i=0;
?
switch(Now_Screen){
case TIMESCREEN:
OledClearString(16,7,"Sync time...",1);
break;
case NOWSCREEN:
case TOSCREEN:
?
case ATOSCREEN:
printf("clear oled i = %dn",i);
OledClearString(0,7,"Get Weather...",1);
break;
default :
break;
?
}
}
}
?
switch (Now_Screen){
?
case TIMESCREEN:
TimeScreenDisp();
break;
?
case NOWSCREEN:
WeatherDisp(NOWSCREEN);
break;
?
case TOSCREEN:
WeatherDisp(TOSCREEN);
break;
?
case ATOSCREEN:
WeatherDisp(ATOSCREEN);
break;
?
default:
break;
}
usleep(100000);
}
}

復(fù)制代碼

4、加入rtc.c
現(xiàn)在時間調(diào)整是通過每一秒時間戳加1，再把時間戳轉(zhuǎn)化為北京時間，到達(dá)時間的更新。為了減少任務(wù)中因?yàn)槠渌瘮?shù)存在，增加時間誤差，所以單獨(dú)創(chuàng)建一個任務(wù)來進(jìn)行時間戳的調(diào)整。

#include
#include
#include
?
#include "ohos_init.h"
#include "cmsis_os2.h"
uint32_t timedata=1608362368;
?
static void RtcTask(void *arg)
{
(void)arg;
while(1)
{
timedata++;
sleep(1);
}
}
?
static void RtcTaskHandle(void)
{
osThreadAttr_t attr;
attr.name = "RtcTask";
attr.attr_bits = 0U;
attr.cb_mem = NULL;
attr.cb_size = 0U;
attr.stack_mem = NULL;
attr.stack_size = 512;
attr.priority = osPriorityNormal;
?
if (osThreadNew(RtcTask, NULL, &attr) == NULL) {
printf("[RtcTaskHandle] Falied to create KeyTask!n");
}
}
APP_FEATURE_INIT(RtcTaskHandle);

復(fù)制代碼

5、修改BUILD.gn

修改OLED文件夾下的BUILD.gn文件，sources中加入keytask.c

sources = [
"oled_demo.c",
"oled_ssd1306.c",
"timeconv.c",
"envrionment_demo.c",
"aht20.c",
"wifi_connecter.c",
"getNTP.c",
"getweather.c",
"cjsonparse.c",
"keytask.c",
"rtc.c"
]

復(fù)制代碼

三、結(jié)果演示

按下右邊按鍵，可以切換界面，有四個界面，分別為時間顯示界面，今天、明天、后天天氣顯示界面。在時間顯示界面按下左鍵，會獲取實(shí)時時間，在天氣顯示界面，按下左鍵會獲取實(shí)時天氣，并且顯示天氣獲取情況提示。

四、總結(jié)

這一篇先寫到這里，下一篇是關(guān)于通過一個公網(wǎng)的中轉(zhuǎn)服務(wù)器，進(jìn)行wifiiot和手機(jī)之間的遠(yuǎn)程數(shù)據(jù)傳輸。

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