Arduino:union/struct属性返回错误的值
我试图用一个union和struct来表示一个32位的信号,这个信号将通过433Mhz的无线电发射机发送。我无法让Arduino在signal.parts.remote属性上存储26位远程id。当我将值设置为23607301(十进制)后获取该值时,取而代之的是14341(十进制)。我应该如何构造此联合以使其返回正确的值 信号hArduino:union/struct属性返回错误的值,c,memory,struct,arduino,unions,C,Memory,Struct,Arduino,Unions,我试图用一个union和struct来表示一个32位的信号,这个信号将通过433Mhz的无线电发射机发送。我无法让Arduino在signal.parts.remote属性上存储26位远程id。当我将值设置为23607301(十进制)后获取该值时,取而代之的是14341(十进制)。我应该如何构造此联合以使其返回正确的值 信号h union signal_union { struct { unsigned unit :2; unsigned ch
union signal_union
{
struct
{
unsigned unit :2;
unsigned channel:2;
unsigned status :1;
unsigned group :1;
unsigned remote :26;
} parts;
unsigned long data;
};
typedef union signal_union Signal;
structtest.ino
#include "Signal.h"
Signal signal1;
Signal signal2;
void testPassingStruct(Signal *variable)
{
variable->parts.status = 1;
Serial.print("Unit: ");
Serial.println(variable->parts.unit);
Serial.println("Should be: 2");
Serial.println("");
Serial.print("Status: ");
Serial.println(variable->parts.status);
Serial.println("Should be: 1");
Serial.println("");
Serial.print("Remote: ");
Serial.println(variable->parts.remote);
Serial.println("Should be: 23607301");
Serial.println("");
Serial.print("Data: ");
Serial.println(variable->data, BIN);
Serial.println("Should be: 01011010000011100000000101110010");
Serial.println("");
}
void setup()
{
Serial.begin(115200);
signal1.parts.remote = 23607301;
signal1.parts.unit = 2;
signal1.parts.group = 1;
testPassingStruct(&signal1);
}
void loop()
{
}
输出(来自Arduino):
这是一个关于的后续问题,我怀疑问题与
unsigned
(又称unsigned int
)的宽度为16位有关。尝试将remote
字段更改为unsigned long
:
unsigned long remote :26;
谢谢你这么做了,一旦你知道了就这么简单了!:)十六进制计算器是你的朋友。14341=0x3805,23607301=0x1683805。当您查看数字时,请尝试查看它们的十六进制表示形式。有时,它有助于发现此类问题。谢谢,这让它更清楚了!:)
unsigned long remote :26;