Hello.
Sorry for my bad English:)
I am trying to read flag on the device MLX90614. datasaheet Page 23. The format of a SMBus transaction which reads flags is:
i.e i must send start->slave address->command and right away without send repeat start receive data. how to do it?
i writing code:
/* Process Locked */
__HAL_LOCK(&hi2c1);
uint32_t nbytes = 0x1;
nbytes = nbytes << 16;
uint8_t txdata = 0xF0;
hi2c1.Instance->CR2 &=~ I2C_CR2_AUTOEND; // autoend disable
hi2c1.Instance->CR2 |= I2C_CR2_RELOAD;// RELOAD enable
hi2c1.Instance->CR2 |= sAddress;
hi2c1.Instance->CR2 |= nbytes;
hi2c1.Instance->CR2 &=~ I2C_CR2_RD_WRN; // read mode
hi2c1.Instance->CR2 |= I2C_CR2_START;
hi2c1.Instance->TXDR |= txdata;
while ((hi2c1.Instance->ISR & I2C_ISR_TXE ) == 0 ){}
while ((hi2c1.Instance->ISR & I2C_ISR_TCR ) == 0 ){}
nbytes = 3;
nbytes = nbytes << 16;
hi2c1.Instance->CR2 |= nbytes;
hi2c1.Instance->CR2 |= I2C_CR2_RD_WRN;
hi2c1.Instance->CR2 |= I2C_CR2_START;
while ((hi2c1.Instance->ISR & I2C_ISR_RXNE ) == 0 ){}
/* Clear STOP Flag */
__HAL_I2C_CLEAR_FLAG(&hi2c1, I2C_FLAG_STOPF);
/* Clear Configuration Register 2 */
I2C_RESET_CR2(&hi2c1);
hi2c1.State = HAL_I2C_STATE_READY;
hi2c1.Mode = HAL_I2C_MODE_NONE;
/* Process Unlocked */
__HAL_UNLOCK(&hi2c1);and can transmit command, but can not receive data.
what i receive:
i2c and device working, becausei can receive and transmit data from the device(EEPROM/RAM).
I hope you got what I meant:) I will be grateful for any help.
