[英]Arduino: union/struct attribute returns the wrong value
I'm trying to use a union and struct to represent a 32-bit signal that is going to be sent via a 433Mhz radio transmitter. 我正在尝试使用union和struct来表示将通过433Mhz无线电发射器发送的32位信号。 I have a problem with getting the Arduino to store the 26-bit remote id on the signal.parts.remote attribute.
我有一个问题,让Arduino将26位远程id存储在signal.parts.remote属性上。 When I fetch the value after setting it to 23607301 (decimal) I get 14341 (decimal) instead.
当我将其设置为23607301(十进制)后取值时,我得到14341(十进制)。 How should I construct this union to have it return the correct value?
我应该如何构建此联合以使其返回正确的值?
Signal.h SIGNAL.H
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 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()
{
}
Output (from Arduino): 输出(来自Arduino):
Unit: 2
Should be: 2
Status: 1
Should be: 1
Remote: 14341
Should be: 23607301
Data: 1110000000010100110010
Should be: 01011010000011100000000101110010
This is a follow up question on Arduino: cannot pass union struct as pointer ac I can with gcc compiler 这是关于Arduino的一个后续问题:不能将union struct作为指针ac传递给gcc编译器
I suspect the issue has to do with the fact that unsigned
(aka unsigned int
) is 16 bits wide. 我怀疑这个问题与
unsigned
(aka unsigned int
)是16位宽的事实有关。 Try changing the remote
field to unsigned long
: 尝试将
remote
字段更改为unsigned long
:
unsigned long remote :26;
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