Hi,
I am using a CY8CKIT-062-BLE board that is communicating with a sensor evaluation board.
The communication between CY8CKIT-062-BLE and the sensor is using I2C.
I am trying to put PSoC into deepsleep when it is in an Idle state.
However, I did the following two experiments and observed the difference in power consumption. I am very confused:
- If I only call "Cy_SysPm_DeepSleep(CY_SYSPM_WAIT_FOR_INTERRUPT)" in the for(;;) loop both in CM0 and CM4, the power consumption I measured from J8 pin can be as low as 0.5 mA.
- If I call the "I2C_Start()" function, and then call "Cy_SysPm_DeepSleep(CY_SYSPM_WAIT_FOR_INTERRUPT)" in the for(;;) loop both in CM0 and CM4, the power consumption I measured from J8 pin is about 0.7 mA. Does it seem that the PSoC did not enter system deepsleep mode?
I am wondering if the reason is there is any resource to prevent the system into deepsleep mode after the initialization of the I2C. And what should I do before calling the "Cy_SysPm_DeepSleep(CY_SYSPM_WAIT_FOR_INTERRUPT)"?
The above experiments are simple tests. Indeed, I am using FreeRTOS in this project, and configuring the tickless idle to put the system into deepsleep.
According to the example code, there is a function "bool IsSystemReadyForTicklessIdle(void)" for checking whether it is ready to set the tickless idle. Inside this function, "Task_Debug_Tickless_Idle_Readiness()" is called for checking whether the UART is ready or not, using "((UART_GetNumInTxFifo() == 0u)&& (Cy_SCB_GetTxSrValid(UART_SCB__HW)== 0u))". I am wondering is there any similar API for checking whether I2C is ready or not.
Thank you for your patience in reading my question. I have been stuck on this problem for a long time and still can not solve it.
Really appreciate your explanations or suggestions for helping me out!!
Sincerely!!
