![]() Note: We need to enable the I2C2 peripheral in the CubeMX view for code generation to include the I2C drivers as we do for the ADC. Leave the configuration as default, as the X-NUCLEO-SRC1M1 BSP will reconfigure it. Start a new project in STM32CubeIDE with C. Look at your I2C setup code, it will be set somewhere there, likely loaded into a hardware register in the I2C peripheral or at least passed to an I2C setup function. For the few demonstrations that follow, we will need a Nucleo board (I’m using a Nucleo-L476RG) and a potentiometer connected to A0: Demo 1: Single ADC Reading Getting the STM32 to take 1 ADC reading is relatively straightforward. Since your software is not included in the question, this is unanswerable. Use two 10k resistors in parallel for SDA and another two for SCL. Steps Open STM32CubeIDE Create a new project using the NUCLEO-G070RB board Enter a name for the project (in this case, the project is named I2CSlave). In the Connectivity section, enable I2C2 peripheral, in I2C mode. 8 Unlike with fixed-function chips, with an MCU the I2C address will be whatever your software makes it. It supports the standard mode (Sm, up to 100 kHz) and Fm mode (Fm, up to. It provides multi-master capability and controls all I2C bus-specific sequencing, protocol, arbitration, and timing. The best way to achieve this is to connect two or three resistors in parallel in each line, this way all two/three would have to be disconnected to leave the bus "unpulled". I 2C (inter-integrated circuit) bus Interface serves as an interface between the microcontroller and the serial I2C bus. The best solution I can think in your case is that you should make sure that you don't loose those pull ups. I'm afraid that your problem might have to do with the master's i2c peripheral not seeing the lines go high when expected because the pullups are disconnected temporarily. ![]() However if you say that there are no slaves, this probably is not your case. This situation can be fixed by the master sending output SCL pulses and finally a stop condition when the lines are released. In many cases the bus can become locked because of a collision or other physical problem like loosing your pullups, in such a case, some slaves don't release the bus properly because they understand that they are still being addressed. It is usually obvious that the sda line is bidirectional, what is not so obvious is that the scl is also somewhat bidirectional, since slaves can maintain the line low to throttle down the speed of the bus. As you have seen already by yourself, pullup resistors are vital for the i2c bus, both in the sda and scl lines.
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