/******************************************************************************
 * Copyright (C) 2014-2015 HangZhou SiZhu Co.,LTD.
 *
 *-----------------------------------------------------------------------------
 * File: 			    AD421.c
 * Description:		3.5-20mA current output code
 * Author:			  Lishoujian (867693272@qq.com)
 * Date:			    Jan 8, 2015
 *****************************************************************************/

/* ----------------------- Platform includes --------------------------------*/
#include "AD421.h"
#include "delay.h"
#include "mem_pro.h"

	u16     delay_times=1;

void AD421_init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	
	//´ò¿ª¿ØÖƶ˿ÚʱÖÓ
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
	//¿ØÖÆÒý½Å£¨Êä³ö£©³õʼ»¯
	GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_10|GPIO_Pin_11|GPIO_Pin_12;   
	GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_Out_PP; 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	                              //B11 DATA ready
	GPIO_Init(GPIOD,&GPIO_InitStructure);	

//	AD421_EN = 1;

}



//¿ØÖÆAD421ʱÖÓƵÂÊ
void AD421_delay(void)
{
	u8			count_j;

	for(count_j = 0;count_j < 4;count_j ++)
	{
		delay_us(1);
	}
}

/******************************************
 * func:    AD421_output
 * desc:    output current: from 3.5mA to 24mA by step of 0.000244mA
 * input:   
 *   ma - the data of current output 
 * output:  output current data equal to the given data "ma"
 * return:  none
 *****************************************/

void AD421_output(float ma)
{ 
	 
   uint32 i,k;//
	 uint32 AD421_in;//AD421_in used to store 16bit transformed binary data from "float ma"	
		
	 if(ma < 3.5) ma = 3.5;
	 if(ma > 24) 	ma = 24;
		
		ma = ma * 1.0015 + 0.01932;  //µçÁ÷Æ«²îÐÞÕý¡£
		if(ma > 24) 	ma = 24;  //ÐÞÕýÖ»ÓÐÒ²²»Äܳ¬¹ý24ma
		
	 k        = (ma - 3.5) / 0.00024414;
	 AD421_in = 0x00003800 + k;
	
//	 AD421_latch = 1;//send 1 pulse for start
//		AD421_delay();//delay_us(1);
//	 AD421_latch = 0;
//		AD421_delay();//delay_us(1);
	
   for(i = 0;i < 17;i ++)
   {   
		 AD421_clk  = 0;
		 AD421_data = (AD421_in >> (16 - i));

			AD421_delay();//delay_us(1);
		 
		 AD421_clk = 1; 

			AD421_delay();//delay_us(1);
		 
    }
		
		AD421_clk = 0;
		AD421_data	= 0;	
			
		AD421_delay();//delay_us(1);//send 1 pulse for end
	  AD421_latch = 1;
		AD421_delay();//delay_us(1);
	  AD421_latch = 0;
			
}