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Wake up by the port interrupt does not work

Question asked by TETSUO MAEDA on Jun 19, 2017
Latest reply on Jun 22, 2017 by TETSUO MAEDA

Hi everyone!


My colleague is facing a problem regarding the u-boot procedure.
When requested, our system needs to enter “deep sleep mode” during u-boot process.
The system needs to wake up through the interrupt at the rising edge of “GPIO3_IO27”.
Before the system goes to "deep sleep mode", DDR is set to “self-refresh,” and the interrupt program and the vector table are copied to IRAM.
We have designed so that when “GPIO3_IO27” interrupt occurs the interrupt program in IRAM will start.
But, this mechanism does not work. In other words, the system does not wake up at the rising edge of “GPIO3_IO27”.
We are afraid there are basic misunderstandings in our thought.
We would appreciate any comments regarding the above procedure.




Tetsuo Maeda