cc2541 i2c configuration not in protocol stack

ming li51

Other Parts Discussed in Thread: CC2541

i wrote some code about i2c configuration and it's not in protocol stack ,but i can't sure if it's right. and this is for SSD1306 OLED,is there some wrong,please.

void i2c_Init(i2cClock_t clockRate)
{
I2CWC = 0x00;
I2CADDR = 0;
I2CCFG &= ~I2C_CLOCK_MASK;
I2CCFG |= clockRate;
I2CCFG |= (I2C_ENS1);
}

uint8 I2C_write(uint8 mcmd)
{

I2CDATA = (mcmd);
I2CCFG &= ~I2C_SI;
while ((I2CCFG & I2C_SI) == 0);

}

uint8 I2C_Start()
{
I2CCFG &= ~I2C_SI;
I2CCFG |= I2C_STA;
while ((I2CCFG & I2C_SI) == 0);
I2CCFG &= ~I2C_STA;
I2C_write(0x78);

}

void I2C_Stop()
{
I2CCFG |= I2C_STO;
I2CCFG &= ~I2C_SI;
while ((I2CCFG & I2C_STO) != 0);
}

void Write_Command(uint8 Data)
{
I2C_Start();
I2C_write(0x00);
I2C_write(Data);
I2C_Stop();
}

void Write_Data(uint8 Data)
{
I2C_Start();
I2C_write(0x40);
I2C_write(Data);
I2C_Stop();
}

over 10 years ago

0 YiKai Chen over 10 years ago

Guru 735695 points

You can find I2C driver hal_i2c.c and hal_i2c.h in C:\Texas Instruments\BLE-CC254x-1.4.1.43908\Components\hal\target\CC2541ARC and C:\Texas Instruments\BLE-CC254x-1.4.1.43908\Components\hal\target\CC2541ST.

0 ming li51 over 10 years ago in reply to YiKai Chen

Prodigy 130 points

yeah , above the code is me changed from hal_i2c.c. i want to sure whether is working. because my item doesn't work,i don't know what's wrong. so i want to confirm my I2C is working.

0 ming li51 over 10 years ago in reply to YiKai Chen

Prodigy 130 points

YiKai Chen,
thanks your replying.
can you tell me is there some missing in my code?

0 YiKai Chen over 10 years ago in reply to ming li51

Guru 735695 points

Do you connect pins 2 and 3 of CC2541 as SDA and SCL?

0 ming li51 over 10 years ago in reply to YiKai Chen

Prodigy 130 points

yes

0 ming li51 over 10 years ago in reply to YiKai Chen

Prodigy 130 points

i didn't use interrupt , but why it needs to configure I2CCFG_SI. like this " while ((I2CCFG & I2C_SI) == 0); "

0 YiKai Chen over 10 years ago in reply to ming li51

Guru 735695 points

Why don't you use API HalI2CInit, HalI2CRead, and HalI2CWrite directly in hal_i2c.c?

0 JXS over 10 years ago in reply to ming li51

TI__Guru** 105180 points

Hello,

I would also suggest looking at the CC2541 SensorTag project for additional i2c examples.

Best wishes

0 ming li51 over 10 years ago in reply to YiKai Chen

Prodigy 130 points

first,thanks your replying.

then ,yes,i used it. but there are some problem.

void Write_Command(uint8 Data)
{
I2C_Start();
I2C_write(0x00);
I2C_write(Data);
I2C_Stop();
}

void Write_Data(uint8 Data)
{
I2C_Start();
I2C_write(0x40);
I2C_write(Data);
I2C_Stop();
}

but i don't know how to realize those two functions. because before write ,there are some commands to send to slave.

this is TI 's function:

uint8 HalI2CWrite(uint8 len, uint8 *pBuf)
{
if (i2cMstStrt(0) != mstAddrAckW)
{
len = 0;
}

for (uint8 cnt = 0; cnt < len; cnt++)
{
I2C_WRITE(*pBuf++);

if (I2CSTAT != mstDataAckW)
{
if (I2CSTAT == mstDataNackW)
{
len = cnt + 1;
}
else
{
len = cnt;
}
break;
}
}

I2C_STOP();

return len;
}

0 ming li51 over 10 years ago in reply to JXS

Prodigy 130 points

can you give me some user's guider?
thanks for your replying,
have a good day!

0 YiKai Chen over 10 years ago in reply to ming li51

Guru 735695 points

There is no user's guide for this I2C thing. You can refer to hal_humi.c in SensorTag example to see how HalI2CInit, HalI2CRead, and HalI2CWrite are called.

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cc2541 i2c configuration not in protocol stack