我正在修补我的 RaspberryPi 和我的 Arduino 以通过 I2C 发送一些文本。到目前为止我已经开始工作了,但是出现了一个不应该存在的数字。
我正在发送“Hello”,将其转换为 int 数组并通过 I2C 发送。
['H','e','l','l','o'] => [72,97,108,108,111] // This should be the result
['H','e','l','l','o'] => [0, 5, 72, 101, 108, 108, 111] // This is what i get
前导 0 是故意的,但 5 根本不应该存在!
我在 Arduino 上运行的(缩短的)代码:
void setup() {
Serial.begin(9600); // start serial for output
// initialize i2c as slave
Wire.begin(SLAVE_ADDRESS);
// define callbacks for i2c communication
Wire.onReceive(receiveData);
Serial.println("Ready!");
}
receiveData(int byteCount) {
int i;
// Iterate through the byte packets
for(i = 0; Wire.available(); i++) {
number = Wire.read();
if(i != 0) { // Ignore the first byte
text[i-1] = (char)number;
}
// Output number, byteCount, and i over the serial bus
}
Serial.print("Result: ");
Serial.println(text);
}
我得到的确切输出:
[CMD]data received: 0, 2char: , byteCount: 7, Iteration: 0 //The cmd byte
data received: 5, 2char: , byteCount: 7, Iteration: 1
data received: 72, 2char: H, byteCount: 7, Iteration: 2
data received: 101, 2char: e, byteCount: 7, Iteration: 3
data received: 108, 2char: l, byteCount: 7, Iteration: 4
data received: 108, 2char: l, byteCount: 7, Iteration: 5
data received: 111, 2char: o, byteCount: 7, Iteration: 6
Result: "Hello"
在树莓派上运行的代码(Python):
import smbus
import time
# Initiate the SMBus on device 1
bus = smbus.SMBus(1)
# The address of the Arduino
address = 0x04
chars = [] # The character/int array
test = "Hello" # The test text
# Split up the string in individual chars,
# convert them to int and add them to the array
for c in test:
chars.append(ord(c))
# send the data... the 0 is the cmd byte! The function accepts an int array
bus.write_block_data(address, 0, chars)
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