atma5 05专题之Arduino 驱动OLED显示案例 SRAM内存不足解决方法

Cursor英语[ks (r)]光标；长大了；长大了。指针；指针。老鼠；老鼠。鼠标指针

Scroll英语[skrl] n .纸卷；长卷轴，卷轴v .滚动屏幕

电线英语[wa (r)] n .电线；金属丝电线(或电线)部分；电线；电线。电线；电线。金属线做成的栅栏；金属线。铁丝网

Vt。用电线打开(建筑物、设备等)电源。连接(磁带录音机、电脑等设备)；这里。安装窃听器

示例1:驱动OLED滚动显示

实验现象

程序使用OLED驱动程序库中的左右移动函数设置移动后，执行延迟操作，并通过显示内容滚动，直到调用滚动停止函数。

代码

/*
0.91OLED滚动显示
*/
#include <Wire.h>
#include <Ada;
#include <Ada;

#define OLED_RESET 4
Adafruit_SSD1306 display(128, 32, &Wire, OLED_RESET);

void setup() {
di(SSD1306_SWITCHCAPVCC, 0x3C);
di(WHITE);//开像素点发光
di();//清屏

di(2); //设置字体大小
di(0, 8);//设置显示位置
di("TonyCode");
di(); // 开显示
}

void loop() {
di(0x00, 0x0F); //向右滚动
delay(5000);
di();
di(0x00, 0x0F);
delay(1000);
di();
}

案例2：打印自开发板重置以来的秒数 显示3行

// 引入IIC通讯所需的Wire库文件
#include <Wire.h>

// 引入驱动OLED0.96所需的库
#include <Ada;
#include <Ada;

#define SCREEN_WIDTH 128 // 设置OLED宽度,单位:像素
#define SCREEN_HEIGHT 32 // 设置OLED高度,单位:像素

// 自定义重置引脚,虽然教程未使用,但却是Adafruit_SSD1306库文件所必需的
#define OLED_RESET 4
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

char* words[] = {"hello","world","like","stutdy"};

void setup()
{
// 初始化Wire库
// Wire.begin();

// 初始化OLED并设置其IIC地址为 0x3C
di(SSD1306_SWITCHCAPVCC, 0x3C);
}

void loop()
{
words_display();
di();
}

void words_display()
{
// 清除屏幕
di();

// 设置字体颜色,白色可见
di(WHITE);

//设置字体大小
di);

//设置光标位置
di(0, 0);
di("I like reading word.");

di(0, 12);
di("time: ");

//打印自开发板重置以来的秒数：
di(millis() / 1000);
di("s");
di(0, 24);
di("Author: ");
di("CYH");
}

案例3、读取char*数组中数据显示

// 引入IIC通讯所需的Wire库文件
#include <Wire.h>

// 引入驱动OLED0.96所需的库
#include <Ada;
#include <Ada;

#define SCREEN_WIDTH 128 // 设置OLED宽度,单位:像素
#define SCREEN_HEIGHT 32 // 设置OLED高度,单位:像素

// 自定义重置引脚,虽然教程未使用,但却是Adafruit_SSD1306库文件所必需的
#define OLED_RESET 4
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

char* words[] = {"Grade 7 1st",
"Unit 3","which","best","so","biology","geography","histroy","date","meeting","o'clock",
"gate","so","show","around","show sb around","front","in front of","building","groud","ground floor",
"bright","modern","hall","diary","look at","wall","let me see","after class","pardon","phone",
"on the phone","from...to...","take","get up","go to school","a.m.","p.m.","reading room","only","sure",
"kind","all kinds of","borrow","borrow...from","letter","few","a few","away","far away from","on foot",
"Unit 4","seldom","activity","quarter","each other","practise","roller skating",
"Unit 5","celebrate","Christmas","festival","present","pumpkin","lantern","trick","treat","paint","special",
"mask","question","grandparent","different","important","let off","packet","radio",};

int len = sizeof(words)/sizeof(words[0]);

void setup()
{
Serial.begin(9600);
Serial.print("单词数量：");
Serial.println(len);
// 初始化Wire库
// Wire.begin();
// 初始化OLED并设置其IIC地址为 0x3C
di(SSD1306_SWITCHCAPVCC, 0x3C);
// 设置字体颜色,白色可见
di(WHITE);
//设置字体大小
di);
}

void loop()
{
for(int i=0;i<len;i++){
di();//清屏
di(0, 0);
di(words[i]);
di();
delay(4000);
}

}

char* words[] = {"Grade 7 1st",
"Unit 1","master","grade","student","reading","classmate","after school","slim","be good at","over",
"classroom","dancing","swimming","age","cute","hobby","glad","everyone","come from","glasses",
"Unit 2","walking","really","bowl","time","tenis","volleyball","enjoy","go swimming","player",
"member","club","free","hope","dream","true","drawing","weekend","at/on weekends","of course",
"shop","table tennis","else","a lot of","lots of","fun","team","talk about/of","match","hero",
"Unit 3","which","best","so","biology","geography","histroy","date","meeting","o'clock",
"gate","so","show","around","show sb around","front","in front of","building","groud","ground floor",
"bright","modern","hall","diary","look at","wall","let me see","after class","pardon","phone"，
"on the phone","from...to...","take","get up","go to school","a.m.","p.m.","reading room","only","sure",
"kind","all kinds of","borrow","borrow...from","letter","few","a few","away","far away from","on foot",
"Unit 4","seldom","activity","quarter","each other","practise","roller skating",
"Unit 5","celebrate","Christmas","festival","present","pumpkin","lantern","trick","treat","paint","special",
"mask","question","grandparent","different","important","let off","packet","radio",};

计算arduino剩余内存


#include <SD.h>

光是这个，就吃了600-700字节的内存···········

那啥，还有天理吗？
送上神奇的程序：

//#include <SD.h>

#include <MemoryFree.h>

void setup()
{
Serial.begin(9600);//设置串口通信波特率为9600
}

void loop()
{
Serial.print("freeMemory()=");
Serial.println(freeMemory());
delay(3000); // wait for a second
}

AVR存储器简介：

AVR 系列单片机内部有三种类型的被独立编址的存储器，它们分别为：

1、Flash 程序存储器（即：程序存储空间、闪存）

2、SRAM 数据存储器（即：动态内存）

3、EEPROM 数据存储器

单片机采用哈弗结构，将程序存储器和数据存储器分开，而数据存储器RAM通常比较小，而程序存储器Flash空间比较大，因此就需要将占用空间较大的不需要改变的数据放在Flash中。

比如需要单片机支持LCD显示文字，就需要一个庞大的字体库，可达到几kb，这么大的数据量放在RAM中是不合适的，只能放在Flash中。

就提供了与之相关的读写操作。

问题导引:

【程序存储空间】剩余很多，而【动态内存】不足，导致无法成功写入。这个问题往往出现在声明了数据“较大”的常量特别是数组的情况下。

解决方法参照原文

原文链接：

ATMmega2560 参数信息

arduino UNO参数信息

注意：请勿尝试通过5V或3.3V引脚为其供电，否则会损坏板上电路调节器。

5V和3.3V引脚 可在将其连接到。

Arduino IOREF： 此引脚提供了供微控制器操作的参考电压。

内存：

ATmega 328p具有32KB的闪存来存储程序，2KB的SRAM和1KB的EEPROM。

闪存：32 KB（ATmega328），其中引导程序SRAM使用的0.5 KB 2 KB（ATmega328）EEPROM ： 1 KB（ATmega328）时钟速度： 16 MHZ

通信：

UNO具有诸如 UART串行通信，SPI和I2C的通信协议。

UART：

UNO使用数字pin0（RX）和数字pin1（TX）进行UART TTL串行通信。

I2C：

UNO使用A4或SDA引脚，而A5或SCL引脚用于与线库的I2C通信。

SCL是时钟信号

SDA是数据信号

注意： SDA和SCL引脚不是UNO中可用于I2C的额外引脚，它是引脚的副本A4和A5。

SPI：

Pin11：（MOSI）

Pin12 ：（MISO）

Pin13：（SCK）

MOSI（Master Out Slave In）-用于将数据发送到外围设备的主控线。

MISO（主机输入从机输出）-用于将数据发送到主机的从机线路。

SCK（串行时钟）-用于同步主机产生的数据传输的时钟脉冲。

对应的引脚以及SPI库用于SPI通信。

ICSP头可用于通过引导加载程序直接对ATmega进行编程。