Arduino PROGMEM 从程序空间读取float值的方法

方法：

使用avr-libc提供的宏定义：

#define pgm_read_float_near(address_short) __LPM_float((uint16_t)(address_short))

//Read a float from the program space with a 16-bit (near) address.

//Note
    //The address is a byte address. The address is in the program space. 

使用方式：

PROGMEM float pi=3.141592653;  // constant value in flash
float diameter = 24.332154;    // variable user value

float circumference = diameter * pgm_read_float_near(&pi);

原文链接：Stackexchange