I am using SDK V2.2 MCIMX6ULL to develop my application on a board with punctual atoms, without using an operating system. However, when I use the I2C module for communication, no matter how I operate, I2C always outputs a start signal on the output signal pin and remains low. No matter what value I write to the I2DR register, I2SR always shows that the data bus is idle. When I observe on the bus using a logic analyzer, I always see that the bus has no signal after the start signal ends, and the two lines are always low. Each line on the motherboard is only connected to a 4.7k pull-up resistor, without any other connection. However, even in the main mode and without a link to the slave device, an addressing signal should be sent, but it has not been sent. I wonder if there is a problem with my code or the chip?
/* Tricky here: As IRQ handler in example doesn't use parameters, just ignore them */ SystemInstallIrqHandler(GPIO1_Combined_0_15_IRQn, GT_INT_IRQHandler, NULL);
Modifying 0 to 1 is sufficient, mainly because uart5 and i2c2 need to set the pin configuration in mux to exchange module outputs in order to output signals on the pins.
Thank you for your interest in NXP Semiconductor products,
I am looking at the code, in the meantime:
Could you please provide the schematics for your board?
Do you have any attachments that show the digital analyzer record?
I understood that you don't have any I2C target on-board, I think that you'll have a header, have you tried both with and without target (other than digital analyzer) connected?
Now, my PWM is working normally, but I2C still cannot work, which eliminates the clock issue. I initialize I2C first, read all register values before starting transmission, write data, and then read all register values again. The register values I read are as follows:
I am using I2C_ The MasterTransferNonBlocking function writes a piece of data to I2DR, but the data displayed in I2SR is empty and there is no data signal sent from the external bus. My PWM is working properly, indicating that there should be no problem with the clock. I don't know why I didn't send the data. At present, the modules that are already working properly include lcdif, UART, PWM, GPT, GPIO, etc. However, I2C cannot function properly. I am using SKD without an operating system environment.
My PWM6 is connected to JTAG_ TDI, PWM8 connected to JTAG_ TRST, I2C1 connected to UART4, I2C2 connected to UART5, A0A1 in the logic analyzer is I2C1, A2A3 is I2C2, and A4A5 is PWM68. Among them, I2C was not started, only PWM was started, but PWM still did not output any signal.
Another thing is that my code is run after being issued with the SDP command, not loaded through EMMC or other methods. The system's power on startup is set to serial port startup, and then I copy it to memory through the SDP write image of the serial port, and then run it through the jump to command.
Thank you for your answer. I found out today that my PWM module is also in the same situation. It seems that these two modules are using the same clock source, right? The answer is obviously the problem with the clock source, but I haven't found the specific problem with the clock source configuration yet. My PWM module also won't output signals after being turned on, the pins always stay low, and interrupts won't enter. How do I set the clock sources of these two modules correctly?
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