Posted on April 04, 2015 at 11:42
#stm32f0 #hal_i2c
Need some help. The I2C seems to not behave as how I expect it to be. I am using fairly standard code. I furnish the necessary address and wish to transmit 3 bytes of data to the slave.
However after acknowledging the address, the Master seems to stretch the clock by holding the line low. I do not want that. I need continuous clocking. How can I do that? and interestingly HAL_I2C_Master_Transmit and HAL_I2C_Master_Transmit_IT behaves differently(even worse) stretched between each data byte! How can I achieve a continuous clocking with no clock stretch? I need the Address block + the 3 blocks of data to be continuous. Thanks in advance. //--------------------Setup-------------------I2CHandle.Instance = I2C1; //using SCL = PB6 and SDA = PB7
I2CHandle.Init.Timing = 0x00200208; //using stm32cubemx
I2CHandle.Init.OwnAddress1 = 0; //not used since always in master mode I2CHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT; I2CHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED; I2CHandle.Init.OwnAddress2 = 0; //not used I2CHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED; I2CHandle.Init.NoStretchMode = I2C_NOSTRETCH_ENABLED; I2CHandle.Init.OwnAddress2Masks = I2C_OA2_NOMASK; //-----------------------Transmit------------------------ while(HAL_I2C_Master_Transmit(&I2CHandle, (uint16_t)(I2CADDR<<1), (uint8_t*)aTxBuffer, 3, 100)!= HAL_OK) #stm32f0 #hal_i2c
