During an I2C transfer there is often the need to first send a command and then read back an answer right away. This has to be done without the risk of another (multimaster) device interrupting this atomic operation. The I2C protocol defines a so-called repeated start condition. After havin...
Reading data from an EEPROM involves an I2C transaction that uses a combined i2c-write and i2c-read data transfer: Following the write of the memory address, data can be read. The transaction looks like this: This transaction involves a repeated Start condition. To realize a re...
XferOptions variable is always set toI2C_NO_OPTION_FRAMEin theHAL_I2C_Transmit_IT. So, once the Xfer is completed, it firesI2C_MasterTransmit_TXE. As the following condition is always false (stm32f4xx_hal_i2c.c): if ((CurrentXferOptions != I2C_FIRST_AND_LAST_FRAME) && (CurrentXferOpt...
I mean specifically using the start detection with additional interrupts to detect that a repeated start condition has been transmitted and it is safe to write to the D register? I read AN4997 and find it disconcerting. This phrase in particular: "apply a small delay (depends on the I...
Group Commands require that all addressed I2C devices execute their received commands when the STOP condition is set. Thanks in advance for any inputs / workarounds Steve M. 6 年多前 Johnson He6 年多前 ...
If a Master I2C device is communicating with a Slave I2C device and generates a Repeated Start condition and starts communicating with second Slave I2C device, how will the first Slave device detect the Repeated Start condition? Will it be able to detect the Repeated Start at all, or will it...