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#include "fdc2214.h"
#include "delay.h"
#include "led.h"
u32 Data_FDC;
//FDC_I2C及讀寫(xiě)操作**************************************************
//FDC IIC 延時(shí)函數(shù)
void FDC_IIC_Delay(void)
{
delay_us(2);
}
void FDC_GPIO_Init(void)
{
}
//初始化IIC I/O口
void FDC_IIC_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);//先使能外設(shè)IO PORTC時(shí)鐘
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5;//端口配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度為50MHz
GPIO_Init(GPIOC, &GPIO_InitStructure); //根據(jù)設(shè)定參數(shù)初始化GPIO
GPIO_SetBits(GPIOC,GPIO_Pin_4|GPIO_Pin_5); //PC.4,PC.5 輸出高
}
//產(chǎn)生IIC起始信號(hào)
void FDC_IIC_Start(void)
{
FDC_SDA_OUT(); //sda線輸出
FDC_IIC_SDA=1;
FDC_IIC_SCL=1;
FDC_IIC_Delay();
FDC_IIC_SDA=0;//START:when CLK is high,DATA change form high to low
FDC_IIC_Delay();
FDC_IIC_SCL=0;//鉗住I2C總線，準(zhǔn)備發(fā)送或接收數(shù)據(jù)
}
//產(chǎn)生IIC停止信號(hào)
void FDC_IIC_Stop(void)
{
FDC_SDA_OUT();//sda線輸出
FDC_IIC_SCL=0;
FDC_IIC_SDA=0;//STOP:when CLK is high DATA change form low to high
FDC_IIC_Delay();
FDC_IIC_SCL=1;
FDC_IIC_SDA=1;//發(fā)送I2C總線結(jié)束信號(hào)
FDC_IIC_Delay();
}
//等待應(yīng)答信號(hào)到來(lái)
//返回值：1，接收應(yīng)答失敗
// 0，接收應(yīng)答成功
u8 FDC_IIC_Wait_Ack(void)
{
u8 ucErrTime=0;
FDC_SDA_IN(); //SDA設(shè)置為輸入
FDC_IIC_SDA=1;FDC_IIC_Delay();
FDC_IIC_SCL=1;FDC_IIC_Delay();
while(FDC_READ_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
FDC_IIC_Stop();
return 1;
}
}
FDC_IIC_SCL=0;//時(shí)鐘輸出0
return 0;
}
//產(chǎn)生ACK應(yīng)答
void FDC_IIC_Ack(void)
{
FDC_IIC_SCL=0;
FDC_SDA_OUT();
FDC_IIC_SDA=0;
FDC_IIC_Delay();
FDC_IIC_SCL=1;
FDC_IIC_Delay();
FDC_IIC_SCL=0;
}
//不產(chǎn)生ACK應(yīng)答
void FDC_IIC_NAck(void)
{
FDC_IIC_SCL=0;
FDC_SDA_OUT();
FDC_IIC_SDA=1;
FDC_IIC_Delay();
FDC_IIC_SCL=1;
FDC_IIC_Delay();
FDC_IIC_SCL=0;
}
//IIC發(fā)送一個(gè)字節(jié)
//返回從機(jī)有無(wú)應(yīng)答
//1，有應(yīng)答
//0，無(wú)應(yīng)答
void FDC_IIC_Send_Byte(u8 txd)
{
u8 t;
FDC_SDA_OUT();
FDC_IIC_SCL=0;//拉低時(shí)鐘開(kāi)始數(shù)據(jù)傳輸
for(t=0;t<8;t++)
{
FDC_IIC_SDA=(txd&0x80)>>7;
txd<<=1;
FDC_IIC_SCL=1;
FDC_IIC_Delay();
FDC_IIC_SCL=0;
FDC_IIC_Delay();
}
}
//讀1個(gè)字節(jié)，ack=1時(shí)，發(fā)送ACK，ack=0，發(fā)送nACK
u8 FDC_IIC_Read_Byte(unsigned char ack)
{
unsigned char i,receive=0;
FDC_SDA_IN();//SDA設(shè)置為輸入
for(i=0;i<8;i++ )
{
FDC_IIC_SCL=0;
FDC_IIC_Delay();
FDC_IIC_SCL=1;
receive<<=1;
if(FDC_READ_SDA)receive++;
FDC_IIC_Delay();
}
if (!ack)
FDC_IIC_NAck();//發(fā)送nACK
else
FDC_IIC_Ack(); //發(fā)送ACK
return receive;
}
//FDC寄存器操作***********************************************************************
/*FDC2214設(shè)置函數(shù)
*IIC寫(xiě)2個(gè)字節(jié)
*reg:寄存器地址
*data1:數(shù)據(jù)1
*data2:數(shù)據(jù)2
*返回值:0 正常
* 其他錯(cuò)誤代碼
*/
u8 Set_FDC2214(u8 reg,u8 MSB,u8 LSB)
{
FDC_IIC_Start();
FDC_IIC_Send_Byte((FDC2214_ADDR<<1)|0);//發(fā)送器件地址+寫(xiě)命令
if(FDC_IIC_Wait_Ack()) //等待應(yīng)答
{
FDC_IIC_Stop();
return 1;
}
FDC_IIC_Send_Byte(reg);//寫(xiě)寄存器地址
FDC_IIC_Wait_Ack(); //等待應(yīng)答
FDC_IIC_Send_Byte(MSB); //發(fā)送數(shù)據(jù)1
if(FDC_IIC_Wait_Ack()) //等待ACK
{
FDC_IIC_Stop();
return 1;
}
FDC_IIC_Send_Byte(LSB); //發(fā)送數(shù)據(jù)2
if(FDC_IIC_Wait_Ack()) //等待ACK
{
FDC_IIC_Stop();
return 1;
}
FDC_IIC_Stop();
return 0;
}
/*讀取FDC2214寄存器數(shù)據(jù)
*IIC讀2個(gè)字節(jié)
*reg:寄存器地址
*返回值:讀到的數(shù)據(jù)
*/
u16 FDC_Read(u8 reg)
{
u16 res;
FDC_IIC_Start();
FDC_IIC_Send_Byte((FDC2214_ADDR<<1)|0);//發(fā)送器件地址+寫(xiě)命令
FDC_IIC_Wait_Ack(); //等待應(yīng)答
FDC_IIC_Send_Byte(reg); //寫(xiě)寄存器地址
FDC_IIC_Wait_Ack(); //等待應(yīng)答
FDC_IIC_Start();
FDC_IIC_Send_Byte((FDC2214_ADDR<<1)|1);//發(fā)送器件地址+讀命令
FDC_IIC_Wait_Ack(); //等待應(yīng)答
res=FDC_IIC_Read_Byte(1)<<8;//讀取數(shù)據(jù),發(fā)送ACK
res|=FDC_IIC_Read_Byte(0);//讀取數(shù)據(jù),發(fā)送nACK
FDC_IIC_Stop(); //產(chǎn)生一個(gè)停止條件
return res;
}
/*得到通道x轉(zhuǎn)換后的數(shù)據(jù)
*index:0 -> CH0
* 1 -> CH1
* 2 -> CH2
* 3 -> CH3
*返回值:讀到的數(shù)據(jù)
*/
//u16 FCD2214_ReadCH(u8 index)
//{
// u16 result;
// switch(index)
// {
// case 0:
// result = FDC_Read(DATA_CH0)&0x0FFF;
// result = (result<<4)|(FDC_Read(DATA_LSB_CH0)>>12);
// break;
// case 1:
// result = FDC_Read(DATA_CH1)&0x0FFF;
// result = (result<<4)|(FDC_Read(DATA_LSB_CH1)>>12);
// break;
// case 2:
// result = FDC_Read(DATA_CH2)&0x0FFF;
// result = (result<<4)|(FDC_Read(DATA_LSB_CH2)>>12);
// break;
// case 3:
// result = FDC_Read(DATA_CH3)&0x0FFF;
// result = (result<<4)|(FDC_Read(DATA_LSB_CH3)>>12);
// break;
// default:break;
// }
// return result;
//}
u32 FCD2214_ReadCH(u8 index)
{
u32 result;
switch(index)
{
case 0:
result = FDC_Read(DATA_CH0)&0x0FFF;
result = (result<<16)|(FDC_Read(DATA_LSB_CH0));
break;
case 1:
result = FDC_Read(DATA_CH1)&0x0FFF;
result = (result<<16)|(FDC_Read(DATA_LSB_CH1));
break;
case 2:
result = FDC_Read(DATA_CH2)&0x0FFF;
result = (result<<16)|(FDC_Read(DATA_LSB_CH2));
break;
case 3:
result = FDC_Read(DATA_CH3)&0x0FFF;
result = (result<<16)|(FDC_Read(DATA_LSB_CH3));
break;
default:break;
}
result =result&0x0FFFFFFF;
return result;
}
/*FDC2214初始化函數(shù)
*返回值:0：初始化正常
* 1：不正常
*/
u8 FDC2214_Init(void)
{
u16 res;
//FDC2214芯片IO口初始化
FDC_GPIO_Init();
//軟件IIC總線初始化
FDC_IIC_Init();
//檢測(cè)ID是否正確，再初始化寄存器
res=FDC_Read(MANUFACTURER_ID);
if(res==0x5449)
{
//設(shè)置Set_FDC2214寄存器
Set_FDC2214(RCOUNT_CH0,0x34,0xFB);//參考計(jì)數(shù)轉(zhuǎn)換間隔時(shí)間（T=(RCOUNT_CH0*16)/Frefx）
Set_FDC2214(RCOUNT_CH1,0x34,0xFB);
Set_FDC2214(RCOUNT_CH2,0x34,0xFB);
Set_FDC2214(RCOUNT_CH3,0x34,0xFB);
Set_FDC2214(SETTLECOUNT_CH0,0x00,0x1B);//轉(zhuǎn)換之前的穩(wěn)定時(shí)間（T=(SETTLECOUNT_CHx*16)/Frefx）
Set_FDC2214(SETTLECOUNT_CH1,0x00,0x1B);
Set_FDC2214(SETTLECOUNT_CH2,0x00,0x1B);
Set_FDC2214(SETTLECOUNT_CH3,0x00,0x1B);
Set_FDC2214(CLOCK_DIVIDERS_C_CH0,0x20,0x02);//選擇在0.01MHz ~ 10MHz的傳感器頻率
Set_FDC2214(CLOCK_DIVIDERS_C_CH1,0x20,0x02);//Frefx = Fclk = 43.4MHz/2(2分頻)
Set_FDC2214(CLOCK_DIVIDERS_C_CH2,0x20,0x02);//CHx_REF_DIVIDER=2;CHx_FIN_SEL=2
Set_FDC2214(CLOCK_DIVIDERS_C_CH3,0x20,0x02);
Set_FDC2214(DRIVE_CURRENT_CH0,0x78,0x00);//0.146ma（傳感器時(shí)鐘建立+轉(zhuǎn)換時(shí)間的驅(qū)動(dòng)電流）
Set_FDC2214(DRIVE_CURRENT_CH1,0x78,0x00);
Set_FDC2214(DRIVE_CURRENT_CH2,0x78,0x00);
Set_FDC2214(DRIVE_CURRENT_CH3,0x78,0x00);
Set_FDC2214(ERROR_CONFIG,0x00,0x00);//全部禁止錯(cuò)誤匯報(bào)
Set_FDC2214(MUX_CONFIG,0xC2,0x0D);//通道0，1，2 ，3；選擇10Mhz為超過(guò)振蕩槽振蕩頻率的最低設(shè)置，多通道，四通道
Set_FDC2214(CONFIG,0x14,0x01);//激活模式，使用內(nèi)部振蕩器做參考頻率，INTB引腳會(huì)隨狀態(tài)寄存器更新被置位
}
else return 1;
return 0;
}
/*測(cè)量線路電容
*index:0：線路0
* 1：線路1
* 2：線路2
* 3：線路3
*返回值：線路總電容C
*/
float Cap_Calculate(u8 index)
{
float Cap;
Data_FDC = FCD2214_ReadCH(index);
// Cap = 56645.763f/((float)Data_FDC);
// return ((Cap*Cap)-33);
Cap = 232021045.248/(Data_FDC);
return (Cap*Cap);
}

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