Setup Deep Sleep Mode with Murata 1ZM

[bshannon]

Greetings,

My team is utilizing NXP's imxrt1064 microcontroller and Murata's 1ZM bluetooth/wifi radio in our product. We would like to put the 1ZM to sleep when it is not being used. I found the application note "Enabling Bluetooth Deep-sleep with NXP Bluetooth UART Driver" and used it as a starting point.

I believe I am able to put the 1ZM to sleep but I am having issues waking it up. The following is pseudo code for what I am doing.

Sleep scenario

-send hci command to enable deep sleep mode

tx message : 01 23 FC 04 02 00 00 00

rx message : 04 FF 03 23 02 00

- Verify that the rx line is idle

- send the break on character

LPUART2->CTRL |= LPUART_CTRL_SBK_MASK;
 
 
Wake up Scenario:
 
- send break off character ( this is done by inverting the tx pin)
LPUART2->CTRL |= LPUART_CTRL_TXINV_MASK;
-delay 300ms
-disable sending the "BREAK ON" character and invert tx pin
  LPUART_BASE->CTRL &= ~(LPUART_CTRL_SBK_MASK | LPUART_CTRL_TXINV_MASK);
-send hci command to disable deep sleep mode

tx message : 01 23 FC 04 02 00 00 00

rx message : 04 10 01 22
 
I believe the rx message for disabling deep sleep mode is an error message, 
HCI_EVENT_HARDWARE_ERROR and the actual error is 
ERROR_CODE_LMP_RESPONSE_TIMEOUT_LL_RESPONSE_TIMEOUT. Am I missing anything? Are there any flaws in my pseudo code? The 1ZM has a device wake GPIO pin(GPIO12), should that pin be in a specific state during this process?

[bshannon · Accepted solution]

I fixed the problem I was having. For sending the Break On Signal, I just needed to do the following: LPUART2->CTRL |= LPUART_CTRL_TXINV_MASK. Then to disable it do the following LPUART_BASE->CTRL &= ~LPUART_CTRL_TXINV_MASK.

[nxf77486]

Hello,

Thank you in advance for contacting NXP support.

We have a User Guide for Bluetooth that you will find useful in order to solve this problem, this user guide explain sleep and wake up command, I don’t know if you have access to this document. This is located under Secure Files section on the 88W8987. Please let me know if you have access to this documentation.

[bshannon]

Greetings,

Thank you for responding to my question. I do not see any documentation in the Secure Files section. I assume this means I do not have access to this document.

[nxf77486]

Hello,

If you are not able to see any documentation is necessary to request special access to this. I will recommend to contact your NXP distributor so they can provide the access to this documentation. Please let me know if there is anything else where we can help you.

[bshannon]

Could you provide the name of the documentation so we can ask our NXP contact/distributor for it?

[nxf77486]

Hello,

It is not necessary to proportionate the documents name this Secure Documentation access is given in general, not for specific devices.

[bshannon]

Greetings,

Is anyone at NXP looking into this issue?