how to configure i2c in stm32f446 nucleo 144

ANNU CHERIAN · ‎2017-09-08

Posted on September 09, 2017 at 07:18

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ANNU CHERIAN · ‎2017-09-12

Posted on September 12, 2017 at 13:50

Why i2c data reception cannot be achieved from rtc in stm32f446. I can write data to rtc. I tried to receive data using hal driver but then also data reception doesn't occurs.

HAL_I2C_Master_Receive(&hi2c2, 0xDF, data_read, 3, 1000);

Tesla DeLorean · ‎2017-09-12

Posted on September 12, 2017 at 16:18

Use 0xDE, and let the downstream code set the R/W bit

I2C2->DR |= 0XDE; // What the heck? Just write the register, don't OR it

I2C2->DR |= 0x00; // Ok, this does what?

Register level programming requires some grasp of what is going on

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ANNU CHERIAN · ‎2017-09-13

Posted on September 13, 2017 at 15:11

Thank you sir for your reply . I got the code for i2c write operation when i enabled gpio output type as open drain and when OR operation removed .But i couldn't read

data from rtc .Always data shows 0 .

void i2c_start()

{

while(I2C2->SR2 & (1<<1)); // wait until I2C1 is not busy anymore

I2C2->CR1 |= (1<<0); // Peripheral enable

I2C2->CR1 &= ~(1<<11); // Disable POS

I2C2->CR1 |= (I2C_CR1_START); // Send I2C1 START condition

while(!((I2C2->SR1 & I2C_SR1_SB) && (I2C2->SR2 & 0x03))); // wait for I2C1 EV5 (check start condition,bus busy,master mode)

I2C2->DR = 0XDE; // slave address

while(!((I2C2->SR1 & 0X82) && (I2C2->SR2 & 0x07))); // wait for I2C1 EV6 (check address sent,data bytes transmitted,bus busy,master mode)

}

void i2c_write()

{

I2C2->DR = 0x00;

while(!((I2C2->SR1 & 0x84) && (I2C2->SR2 & 0x07))); // check data register empty,data byte transfer succeeded

}

void i2c_restart()

{

I2C2->CR1 |= (I2C_CR1_START); // Send I2C1 START condition

while(!((I2C2->SR1 & I2C_SR1_SB) && (I2C2->SR2 & 0x03))); // wait for I2C1 EV5 (check start condition,bus busy,master mode)

I2C2->DR = 0XDF; // slave address

I2C2->SR1 &= ~(1<<10); // Acknowledge disable

while(!((I2C2->SR1 & I2C_SR1_ADDR) && (I2C2->SR2 & 0x07))); //wait for I2C1 EV6 (check address sent,data bytes transmitted,bus busy,master mode)

}

void i2c_stop()

{

I2C2->CR1 |= (I2C_CR1_STOP);

}

void i2c_read()

{

while((I2C1->SR1 & I2C_SR1_RXNE));

data = I2C1->DR;

}

ANNU CHERIAN · ‎2017-09-13

Posted on September 14, 2017 at 06:25

Sorry , ...

void i2c_read()

{

while(!(I2C1->SR1 & I2C_SR1_RXNE));

data = I2C1->DR;

}

waiting on while(!(I2C1->SR1 & I2C_SR1_RXNE));