Arduino - 有效地遍历 C 数组 [英] Arduino - Iterate through C array efficiently

问题描述

我有以下数组:

PROGMEM prog_uint16_t show_hide_info[] = { 4216, 8900, 4380, 580, 500, 600, 500, 580, 1620, 580, 500, 600, 500, 580, 500, 600, 480, 600, 500, 580, 1620, 580, 1620, 600, 500, 580, 1620, 580, 1620, 600, 1600, 600, 1620, 580, 1620, 600, 500, 580, 1620, 580, 500, 600, 1600, 600, 500, 580, 1620, 580, 500, 600, 1620, 580, 1620, 600, 480, 600, 1620, 580, 500, 600, 1600, 600, 500, 580, 1620, 580, 500, 600, 39300, 8860, 2160, 580, 0 };

我希望能够遍历这个数组并相应地执行以下方法:

I'd like to be able to loop through this array and execute the following methods accordingly:

pulseIR(4216);
delayMicroseconds(8900);
pulseIR(4380);
delayMicroseconds(580);
...

这就是我到目前为止所拥有的，这显然偏离了轨道:

This is what I have so far, which is obviously way off track:

unsigned int* get(prog_uint16_t code[]) {
  unsigned int c;

  while ((c = pgm_read_word(code++))) {
    //pulseIR(c); ??
    //delayMicroseconds(c+1); ??
  }
}

老实说，我不太确定我打算用 c 做什么.

Not quite sure what I'm meant to be doing with c to be honest.

由于睡眠不足，我终生无法理解有关 PROGMEM 的以下文档:

Due to lack of sleep, I can't for the life of me make sense of the following documentation on PROGMEM:

http://arduino.cc/en/Reference/PROGMEM

推荐答案

首先，您需要一些简写来找到数组的末尾.如果它是固定数量的值，那么编译器可以通过这种方式计算它以找到 int16 值的数量:

First you'll need some short hand to find the end of the array. If its a fixed number of values, then the compiler can calculate it this way to find the count of int16 values:

PROGMEM prog_uint16_t show_hide_info[] = { 4216, 8900, 4380, 580, ....etc
int arraySize = sizeof(show_hide_info) / sizeof(prog_uint16_t);

那么如果你想要一个函数只通过你的数组一次，这个函数可以这样声明:

Then if you want to have a function that goes thru your array just once, the function can be declared this way:

void cycleThruArrayOnce(prog_uint16_t *pInArray, int nLimit) {
 for (int i=0;i<nLimit;i=i+2) {
   pulseIR(pgm_read_word(pInArray++));
   delayMicroseconds(pgm_read_word(pInArray+));
 }
}

它可以通过这种方式从你的主程序中调用:

And it can be called from your main program this way:

cycleThruArrayOnce(show_hide_info, arraySize);

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