Posted on July 01, 2014 at 18:09Since there is no function for the stm32f30 series like send7bitslaveaddress which is there for other series when do I check the NACK flag in case the slave is not present? The sending of the slave address seems to happen automatically but if I try to check the NACK flag after right after GenerateSTART command it is always set cause the address has not been sent yet. If however I wait till TXE is RESET after generate it gets stuck in this while loop after 3 calls. any idea how to deal with it? I want to make i2c non blocking using just flags. My code is:-
uint8_t I2C_write_1byte(uint8_t SLAVE_ADDR,uint8_t reg,uint8_t data)
{
I2C_SlaveAddressConfig ( I2C_NUM,SLAVE_ADDR);
I2C_AcknowledgeConfig(I2C_NUM, DISABLE); // MOST IMPORTANT!!! OR MAYBE NOT;
I2C_TransferHandling ( I2C_NUM,SLAVE_ADDR,3,I2C_SoftEnd_Mode,I2C_Generate_Start_Write);
I2C_GenerateSTART(I2C_NUM,ENABLE);
mYellowTOGGLE;
while(I2C_GetFlagStatus(I2C_NUM,I2C_FLAG_TXE)==RESET);
mGreenTOGGLE;
if (I2C_GetFlagStatus(I2C_NUM,I2C_FLAG_NACKF)==RESET)
{
I2C_ClearFlag(I2C_NUM, I2C_FLAG_TXE);
I2C_ClearFlag(I2C_NUM, I2C_FLAG_NACKF);
I2C_GenerateSTOP ( I2C_NUM,ENABLE);
// I2C_Cmd(I2C_NUM,DISABLE);
// I2C_Cmd(I2C_NUM,ENABLE);
mBlueTOGGLE;
return 0;
}
// mGreenTOGGLE;
I2C_NUM->TXDR = reg;
while(I2C_GetFlagStatus(I2C_NUM,I2C_FLAG_TXE)==RESET);
I2C_NUM->TXDR = data;
while(I2C_GetFlagStatus(I2C_NUM,I2C_FLAG_TXE)==RESET);
I2C_GenerateSTOP ( I2C_NUM,ENABLE);
return 1;
}
#stm32f303 #i2c
