質問編集履歴
2
送信側のプログラムが間違っていたので修正
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@@ -19,17 +19,77 @@
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```C言語
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#送信側
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#include <SPI.h>
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unsigned char m_date; //MSB byte
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unsigned char l_date; //LSB byte
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-
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const int CS = 10;
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const int OUT = 7;
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unsigned int buff;
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float time_sum,time_by_buff_sum,time_square_sum,buff_sum;
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float bunnshi,bunnbo,grad;
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-
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float data[1];
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//float samp_count, samp_time;
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void setup() {
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Serial.begin(9600);
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pinMode(CS, OUTPUT);
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pinMode(OUT,OUTPUT);
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SPI.begin();
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SPI.setBitOrder(MSBFIRST); //MSB is sent at the first
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SPI.setDataMode(SPI_MODE3); //select SPI MODE
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SPI.setClockDivider(SPI_CLOCK_DIV16); //Clock f = 16MHz/16 = 1MHz
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}
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void loop() {
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//write process
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//Serial.println(m_date);
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//Serial.println(l_date);
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buff_sum = 0;
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-
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time_sum = 0;
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time_by_buff_sum = 0;
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time_square_sum = 0;
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-
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bunnshi = 0;
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bunnbo = 0;
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grad = 0;
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digitalWrite(OUT,HIGH);
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for (int i = 1 ; i <= 25 ; i++) { //add voltage 25 times
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digitalWrite(CS, LOW); //CS on
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m_date = SPI.transfer(0x00); //receive high bit
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l_date = SPI.transfer(0x00); //receive low bit
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digitalWrite(CS, HIGH); //CS off
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buff = m_date * 256 + l_date; //high bit * 256 (8bit) + low bit(8bit) = all bit(16bit)
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buff_sum += buff;
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time_sum += i;
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time_by_buff_sum += i * (float)buff;
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time_square_sum += i*i;
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//Serial.println(buff);
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//Serial.write(buff);
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delay(40);
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}
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digitalWrite(OUT,LOW);
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bunnshi = 25 * time_by_buff_sum - time_sum * buff_sum;
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bunnbo = 25 * time_square_sum - time_sum * time_sum;
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grad = bunnshi / bunnbo;
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data[0] = grad;
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//Serial.println(grad);
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Serial.write((byte*) data ,4);
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delay(1000);
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}
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```
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1
送信側のプログラムを追加
title
CHANGED
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File without changes
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body
CHANGED
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@@ -1,14 +1,24 @@
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1
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-
### 前提・実現したいこと
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```### 前提・実現したいこと
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2
2
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arduinoからUSBのシリアル通信でraspberry piに送ろうとしています。arduinoでfloat型の数値をbytes型に変換し、raspberry piに送ります。送られてきたデータを再びfloat型に
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戻したいのですが、どのように戻せばいいのか調べてみても分かりませんでした。そのまま出力すると文字化けをしてしまい、どのような値のデータか判断できません。
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4
4
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言語はPythonを使っています。
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```python(受信側)
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-
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import serial
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import time
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def main():
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con=serial.Serial('/dev/ttyACM0',9600)
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time.sleep(2)
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print(con.portstr)
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while 1:
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num=con.read(4)
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print(num)
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if __name__=="__main__":
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main()
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```
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7
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8
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-
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```C言語
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9
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-
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10
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-
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11
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-
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21
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+
#送信側
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12
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import serial
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13
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import time
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def main():
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@@ -20,7 +30,9 @@
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print(num)
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if __name__=="__main__":
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main()
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```
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24
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### 試したこと
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25
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26
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float.fromhex(num)のメソッドに入れてみた。
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