linux应用程序模拟i2c读写,linux平台上GPIO模拟I2C

秒速五厘米 2023-01-20 08:08 21阅读 0赞

\#ifdef I2C\_USE\_GPIO

\#define GPIO\_I2C\_DEBUG

\#define GPIO\_I2C\_SDA\_PIN GPIO\_I2C1\_SCA\_PIN

\#define GPIO\_I2C\_SCA\_PIN GPIO\_I2C1\_SDA\_PIN

\#define GPIO\_SDA\_OUTP mt\_set\_gpio\_dir(GPIO\_I2C\_SDA\_PIN,GPIO\_DIR\_OUT) //设定SDA输出

\#define GPIO\_SDA\_INP mt\_set\_gpio\_dir(GPIO\_I2C\_SDA\_PIN,GPIO\_DIR\_IN) //设定SDA输入

\#define GPIO\_SCL\_OUTP mt\_set\_gpio\_dir(GPIO\_I2C\_SCA\_PIN,GPIO\_DIR\_OUT) //设定SCL输出

\#define I2C\_SDA\_Output(value) mt\_set\_gpio\_out(GPIO\_I2C\_SDA\_PIN,value)

\#define I2C\_SCL\_Output(value) mt\_set\_gpio\_out(GPIO\_I2C\_SCA\_PIN,value)

\#define DELAY\_TIME 0xc0

u8 I2C\_SDA\_Read(void) //SDA读数据

return mt\_get\_gpio\_in(GPIO\_I2C\_SDA\_PIN);

void I2C\_Init(void)

mt\_set\_gpio\_mode(GPIO\_I2C\_SDA\_PIN,GPIO\_MODE\_00);

mt\_set\_gpio\_mode(GPIO\_I2C\_SCA\_PIN,GPIO\_MODE\_00);

GPIO\_SDA\_OUTP;

GPIO\_SCL\_OUTP;

I2C\_SDA\_Output(1);

I2C\_SCL\_Output(1); //默认拉高

\#define I2C\_START\_TRANSMISSION

volatile u8 idx;

GPIO\_SCL\_OUTP;

GPIO\_SDA\_OUTP;

I2C\_SDA\_Output(1);

for (idx = 0; idx

I2C\_SCL\_Output(1);

for (idx = 0; idx

I2C\_SDA\_Output(0);

for (idx = 0; idx

I2C\_SCL\_Output(0);

\#define I2C\_STOP\_TRANSMISSION

volatile u8 idx;

GPIO\_SCL\_OUTP;

GPIO\_SDA\_OUTP;

I2C\_SCL\_Output(0);

I2C\_SDA\_Output(0);

for (idx = 0; idx

I2C\_SCL\_Output(1);

for (idx = 0; idx

I2C\_SDA\_Output(1);

static kal\_uint8 I2C\_Send\_Byte(kal\_uint8 send\_byte)

volatile signed char i = 0;

volatile kal\_uint16 j = 0;

kal\_uint8 ack = 0;

for (i = 7; i >= 0; i--)

if (send\_byte&(1 <

I2C\_SDA\_Output(1);

else

I2C\_SDA\_Output(0);

for (j = 0; j

I2C\_SCL\_Output(1);

for (j = 0; j

GPIO\_SDA\_OUTP; /\* only for delay \*/

for (j = 0; j

I2C\_SCL\_Output(0);

for (j = 0; j

GPIO\_SDA\_INP;

for (j = 0; j

I2C\_SCL\_Output(1);

for (j = 0; j

ack = I2C\_SDA\_Read();

for (j = 0; j

I2C\_SCL\_Output(0);

for (j = 0; j

GPIO\_SDA\_OUTP;

return ack;

static kal\_uint8 I2C\_Receive\_Byte(void)

volatile signed char i = 0;

volatile kal\_uint16 j = 0;

kal\_uint8 get\_byte = 0;

GPIO\_SDA\_INP;

for (j = 0; j

for (i = 7; i >= 0; i--) \{ // data bit 7~0

I2C\_SCL\_Output(1);

for (j = 0; j

if (I2C\_SDA\_Read()) \{

get\_byte |= (1 <

for (j = 0; j

I2C\_SCL\_Output(0);

for (j = 0; j

// don't care bit, 9th bit

GPIO\_SDA\_OUTP;

I2C\_SDA\_Output(1);

for (j = 0; j

I2C\_SCL\_Output(1);

for (j = 0; j

I2C\_SCL\_Output(0);

return get\_byte;

static kal\_uint16 I2C\_Receive\_word(void)

volatile signed char i = 0;

volatile kal\_uint32 j = 0;

kal\_uint16 get\_byte = 0;

for (i = 15; i >= 8; i--)

GPIO\_SDA\_INP;

for (j = 0; j

I2C\_SCL\_Output(1);

for (j = 0; j

if (I2C\_SDA\_Read()) get\_byte |= (1 <

for (j = 0; j

I2C\_SCL\_Output(0);

for (j = 0; j

I2C\_SDA\_Output(0);

GPIO\_SDA\_OUTP;

for (j = 0;j

I2C\_SCL\_Output(1);

for (j = 0;j

GPIO\_SDA\_OUTP; /\* just for delay \*/

for (j = 0;j

I2C\_SCL\_Output(0);

for (j = 0;j

for (; i >= 0; i--)

GPIO\_SDA\_INP;

for (j = 0; j

I2C\_SCL\_Output(1);

for (j = 0; j

if (I2C\_SDA\_Read()) get\_byte |= (1 <

for (j = 0; j

I2C\_SCL\_Output(0);

for (j = 0; j

I2C\_SDA\_Output(1);

GPIO\_SDA\_OUTP;

for (j = 0;j

I2C\_SCL\_Output(1);

for (j = 0;j

GPIO\_SDA\_OUTP; /\* just for delay \*/

for (j = 0;j

I2C\_SCL\_Output(0);

for (j = 0;j

return get\_byte;

u8 I2C\_Byte\_Write(u8 \* a\_puBuff , u8 len , u8 i2c\_addr)

kal\_uint8 fail\_try\_no = 4;

volatile signed char i = 0 ;

u8 ack\_flag = 0;

while (--fail\_try\_no > 0)

ack\_flag = 0;

I2C\_START\_TRANSMISSION;

if (I2C\_Send\_Byte(i2c\_addr)) continue;

for(i = 0 ;i

if (I2C\_Send\_Byte(a\_puBuff\[i\]))\{

ack\_flag = 1;

break;

if(ack\_flag)

continue;

break;

I2C\_STOP\_TRANSMISSION;

return 0;

u8 I2C\_Bytes\_Read(u8 \*a\_puBuff, u8 reglen ,u8 \*byteget,u8 bytelen,u8 i2c\_addr)

kal\_uint16 get\_byte = 0xFFFF;

kal\_uint8 fail\_try\_no = 4;

volatile kal\_uint32 i = 0;

u8 ack\_flag = 0;

while (--fail\_try\_no > 0)

ack\_flag = 0;

I2C\_START\_TRANSMISSION;

if (I2C\_Send\_Byte(i2c\_addr)) continue;

//send reg

for(i = 0 ;i

if (I2C\_Send\_Byte(a\_puBuff\[i\]))\{

ack\_flag = 1;

break;

if(ack\_flag)

continue;

I2C\_START\_TRANSMISSION;

if (I2C\_Send\_Byte(i2c\_addr | 1)) continue;

if(bytelen == 1)

byteget\[0\] = get\_byte = I2C\_Receive\_Byte(); //读单个字节，不需要再发应答

else if(bytelen > 1)

get\_byte=I2C\_Receive\_word();

byteget\[1\] = get\_byte & 0x00ff;

byteget\[0\] = (get\_byte & 0xff00) >> 8;

break;

I2C\_STOP\_TRANSMISSION;

printk("----%s---read data %x---n",\_\_func\_\_,get\_byte);

return get\_byte;

int iWriteRegI2C(u8 \*a\_pSendData , u16 a\_sizeSendData, u16 i2cId)

I2C\_Byte\_Write(a\_pSendData,a\_sizeSendData,i2cId);

return 0;

int iReadRegI2C(u8 \*a\_pSendData , u16 a\_sizeSendData, u8 \* a\_pRecvData, u16 a\_sizeRecvData, u16 i2cId)

linux应用程序模拟i2c读写,linux平台上GPIO模拟I2C

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