[env:megaatmega2560]
platform = atmelavr
board = megaatmega2560
framework = arduino

#include "led.h"
#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "lcd.h"
#include "key.h"  
#include "ads1115.h"
 
float aa;    
 
 int main(void)
 { 
     float t1; 
   u16 t,result;
     u8 key;
     u16 i=0;
 
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// Set interrupt priority group 2
    delay_init();             
    uart_init(9600);         // The serial port is initialized to 9600
    LED_Init();                  
     //LCD_Init();    
    KEY_Init();                 
        //IIC initilize 
    ADS1115_Init();
  
    while(1)
    {
        key=KEY_Scan(0);
        if(key==WKUP_PRES)
        {                
          result=lvbo(0xeb,0x82);    // A0 A1 is the differential input test terminal, low eight bits + high eight bits 1111 1011, 1000 0010
            
            if(result >= 0x8000 && result <= 0xffff)
                result = 0xffff - result;   //If the difference is negative, take the absolute value, so that A0 and A1 can be connected positively and negatively.
             else if(result >= 0xffff)
                result = 0;
            
          t1=4.096*2*result/65535;     //converted to voltage
    
            printf("The range is 4.096V, the voltage between A0-A1 = %f V\r\n",t1);//print
            
                if(result == 0x7fff || result == 0x8000)
            {
                printf("over range \r\n\r\n");
            }
            else
            {
                printf("Read OK \r\n\r\n");
            }    
        }
        
        if(key==KEY0_PRES)
        {                 
          result=lvbo(0xe3,0xb2); //A2 A3 is the differential input test terminal, low eight bits + high eight bits 1111 0011,1011 0010
            
            
            if(result >= 0x8000)
                result = 0xffff - result; //If the difference is negative, take the absolute value, so that A2 and A3 can be connected positively and negatively.
            
            
          t1=4.096*2*result/65535;     //converted to voltage
            
            printf("The range is 4.096V, the voltage between A2-A3 = %f V\r\n",t1); //print
            
                if(result == 0x7fff || result == 0x8000) // exceeds the maximum value or falls below the minimum value
            {
                printf("over range \r\n\r\n");
            }
            else
            {
                printf("over range\r\n\r\n");
            }    
        }    
        
        if(key == KEY1_PRES)
        {
                  result=lvbo(0xe3,0xb4);    //A2 A3 is the differential input test terminal, low eight bits + high eight bits 1111 0011,1011 0100
            
            if((result >= 0x8000) && (result <= 0xffff))
                result = 0xffff - result;   //If the difference is negative, take the absolute value, so that A0 and A1 can be connected positively and negatively.
             else if(result >= 0xffff)
                result = 0;
          t1=2.048*2*result/65535;     //converted to voltage
            
            printf("The range is 2.048V, the voltage between A0-A1 = %f V\r\n",t1);//打印
            if(result == 0x7fff || result == 0x8000)
            {
                printf("over range \r\n\r\n");
            }
            else
            {
                printf("over range \r\n\r\n");
            }
        }
        
        i++;
        delay_ms(10);
        if(i==20)
        {
            LED0=!LED0;//Prompt system is running   
            i=0;
            }           
    }
}