#include "ads8685.h"
#include "delay.h"
void Ads8685_RESET(void)
{
ADS8685_RST=0;
delay_ms(30);
ADS8685_RST=1;
delay_ms(30);
}
void Ads8685_WriteData(u8 data)
{
u8 index=0;
ADS8685_SCLK =0;
delay_us(2);
for(index=0;index<8;index++)
{
if(data&0x80)
{
ADS8685_SDI=1;
}
else
{
ADS8685_SDI=0;
}
ADS8685_SCLK =1;
delay_us(2);
ADS8685_SCLK =0;
delay_us(2);
data=data<<1;
}
ADS8685_SCLK =0;
delay_us(2);
}
void Ads8685_WriteReg(u8 reg,u16 data)
{
u16 retry=0;
ADS8685_CS=0;
while(ADS8685_RVS)//此引脚为低电平才可以操作ADS8685
{
retry++;
if(retry>=0xfffe)
{
break;
}
}
Ads8685_WriteData(0xd0);//input command ,datesheet P43
Ads8685_WriteData(reg);
Ads8685_WriteData(data>>8);//写高8位
Ads8685_WriteData((u8)(data&0xff));//写低8位
ADS8685_CS=1;
}
void Ads8685_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能PB,PE端口时钟
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9; //LED0-->PB.5 端口配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度为50MHz
GPIO_Init(GPIOB, &GPIO_InitStructure); //根据设定参数初始化GPIOB.5
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5; //LED0-->PB.5 端口配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //上拉输入
GPIO_Init(GPIOB, &GPIO_InitStructure);
ADS8685_SCLK=0;
ADS8685_RST=0;
Ads8685_RESET();
Ads8685_WriteReg(0x14,0x000b);//使用内部参考电压源并且设置输入电压范围为0~5.12V 1.5*Vref 内部参考电压4.096V
}
u16 Ads8685_Readdata(void)
{
u16 retry=0;
u8 index=0;
u32 read_data=0;
delay_us(10);
ADS8685_CS=1;
retry=0;
while(!ADS8685_RVS)
{
retry++;
if(retry>=0xfffe)
{
break;
}
}
ADS8685_CS=0;
retry=0;
while(ADS8685_RVS)
{
retry++;
if(retry>=0xfffe)
{
break;
}
}
for(index=0;index<32;index++)
{
delay_us(2);
ADS8685_SCLK=1;
delay_us(2); //时间大于15ns即可
read_data = read_data << 1;
if(ADS8685_SDO_0) //串行通信 数据输出0 读SD0_0,如果有数据1，则加到read_data末尾
{
read_data=read_data+1;
}
ADS8685_SCLK=0;
delay_us(1);
}
delay_us(2);
ADS8685_CS=1;
return (read_data>>16);
}
