使用Arduino Uno和Arduino IDE无法正确读取通过串行发送的大字符串。如果键入的命令太长,则不会返回全部数据,有时甚至是随机数。
99,3,0,1,0,0,0
正确生成(不确定为什么会有结尾,
tho):receivedValues are: 99,3,0,1,0,0,0,
[99,3,0,0,0,0,0
结果正确于:receivedValues are: 99,3,0,0,0,0,0,
哪里开始出错:
[99,3,0,100,200,300,400
结果为:receivedValues are: 99,3,0,100,200,44,144,
[99,123456789
结果为:receivedValues are: 99,21,0,1,200,200,244,
[99,3,0,1,200,200,2000
结果为:receivedValues are: 99,3,0,1,200,200,208,
这是我的代码中与之相关的部分:
uint8_t receivedValues[7] = {0, 0, 0, 0, 0, 0, 0};
#define HEADER 0 // 99
#define CMD 1 // LICHT (2) || GEUR (3)
#define DATA0 2 // KLEUR INDEX || GEUR INDEX
#define DATA1 3 // H || ON / OFF
#define DATA2 4 // S
#define DATA3 5 // V
#define DATA4 6 // BlendTime
#define CHECK 99
#define ON 1
#define OFF 0
bool messageReceived = false;
bool startBlending = false;
void setup()
{
Serial.begin(9600);
}
void loop()
{
ParseSerial();
if (messageReceived)
{
printMessage();
// CheckCommand();
messageReceived = false;
}
}
void ParseSerial()
{
int serialIndex = 0;
if (Serial.available() > 8)
{
while (0 < Serial.available())
{
String bufferString;
int bufferInt;
bufferString = Serial.readStringUntil(',');
bufferInt = bufferString.toInt();
receivedValues[serialIndex] = bufferInt;
serialIndex++;
}
if (receivedValues[HEADER] == CHECK)
{
Serial.print("receivedValues[0]: ");
Serial.println(receivedValues[0]);
messageReceived = true;
}
if (receivedValues[HEADER] != CHECK)
{
Serial.println("not a good package");
}
Serial.flush();
}
else
{
Serial.flush();
}
}
void printMessage()
{
Serial.print("receivedValues are: ");
for (int i = 0; i < 7; i++)
{
Serial.print(receivedValues[i]);
Serial.print(",");
}
Serial.println();
}
如果消息的标题不是以99
开头,它将写入not a good package
。值得注意的是,当我在ONCE开头输入99
时输入命令时,大多数时候它将两次写入not a good package
。
receivedValues
声明为uint8_t receivedValues[7]
。 uint8_t
的最大值为255。如果尝试存储更大的数字,它将被截断。
如果要存储更大的数字,则需要为数组选择更大的整数类型,例如
uint32_t receivedValues[7] = {0, 0, 0, 0, 0, 0, 0};
将达到UINT32_MAX
,即0xFFFFFFFF
(4294967295
)
我找到了解决此问题的方法。不能更改uint8_t。
8个二进制位的字节可以表示28 = 256个数字:0-255。 串行连接逐字节发送数据,因此如果要发送 大于255的数字,则必须发送多个字节
链接到源:https://forum.arduino.cc/index.php?topic=492055.0
我最终发送的数字(分钟)少于255,然后在Arduino代码中再次将其乘以(秒)。