NACK when program the flash using JLink_Lite

Question

Posted on July 14, 2018 at 20:38Hi,Communication: I2CMaster: STM32F746NGH6Slave: bq25895MIDE: Eclipse NeonPreviously, I can read from and write to the slave using HAL_I2C_Mem_Read() and HAL_I2C_Mem_Write() with I2C communication. After I program my flash using JFlashLite, my previous program did not work anymore. Particularly, the above methods return HALL_ERROR since NACK flag is set. The weird thing is that I have tested if I can get I2C communication using putty, and there is a communication. It just isn't with my previous program.I don't know why and how to fix this.Any helps would be appreciated.  I have included the log from putty in case if its needed for the problem-solving process. Test finished successfully. 2I2C OK with battery charger.DATA0 IS WRITTENDATA1 IS WRITTENDATA0 = 0X7FDATA1 = 0X5DATA2 = 0X31DATA3 = 0XADATA4 = 0X20DATA5 = 0X13DATA6 = 0X82DATA7 = 0X9DDATA8 = 0X3DATA9 = 0X44DATA10 = 0X93DATA11 = 0XC6DATA12 = 0DATA13 = 0X57DATA14 = 0DATA15 = 0DATA16 = 0DATA17 = 0XE1DATA18 = 0DATA19 = 0X3FThanks.

Tesla DeLorean · Answer

Posted on July 14, 2018 at 21:35Going to be hard to troubleshoot remotely.I'd assume it's unrelated to the JLink unless you can make a case for something in flash or option bytes interfering with things.You need to scope the I2C pins and validate the signals and sequencing. The slave device must respond to it's address on the bus, so the lack of ACK signal indicates the slave is unresponsive. Make sure you have suitable pull ups on the SDA/SCL pins, and the address presents correctly. Check any address jumpers on the slave.

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