topic Re: How can i enable m0+ core on NXP LPC54102 microcontroller? in LPC Microcontrollers

How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:38 GMT

Content originally posted in LPCWare by waleed on Thu Mar 26 12:49:29 MST 2015
Hi,

I want to run a bare metal application on m0+ core of NXP LPC54102, but i don't know how can i wake up the core from sleep? What registers should i look into to wake up the m0+ core? Since m0+ core can only be enabled by m4 core so, how can i use m4 core to wake up m0+ core?

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:38 GMT

Content originally posted in LPCWare by lpcxpresso-support on Thu Mar 26 13:07:03 MST 2015
If you are using LPCXpresso, you can create a 'multicore' project for the M4 and M0 cores and the startup code (optionally) starts the m0 core(*). Look in the startup.c and boot_multicore_slave.[ch] files.

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:39 GMT

Content originally posted in LPCWare by lpcxpresso-support on Thu Mar 26 13:17:19 MST 2015
And for more details, read the FAQ ...

http://www.lpcware.com/content/faq/lpcxpresso/lpc541xx-multicore-apps

Regards,
LPCXpresso Support

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:39 GMT

Content originally posted in LPCWare by waleed on Fri Mar 27 05:30:04 MST 2015
Actually i want to write the initialization code myself that would wake up the m0+ core. That is why i am not using LPCXpresso. So any suggestions on how can i write that?

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:40 GMT

Content originally posted in LPCWare by nerd herd on Fri Mar 27 07:54:00 MST 2015
Hi waleed,

You can take a look at the Keil MDK LPCOpen multicore blinky example as a reference (the keil .s startup file has the assembly code you are interested in).

Essentially what happens is that there is a register that indicates which core is "Master". Both cores will initially bootup and check if they are master (reset value of this register puts the Cortex-M4 as master). The Cortex-M0 core will find that he is the slave and will immediately go to sleep. The Cortex-M4 core will find that he is master and will proceed to setup registers as he would normally.

Link to LPCOpen:
http://www.lpcware.com/content/nxpfile/lpcopen-software-development-platform-lpc5410x-packages

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:41 GMT

Content originally posted in LPCWare by starblue on Fri Mar 27 08:35:06 MST 2015
IMHO this should be documented in the user manual, but I can't find anything there.

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:41 GMT

Content originally posted in LPCWare by nerd herd on Fri Mar 27 10:25:00 MST 2015
Hi starblue,

We have an update for the UM coming out of the pipeline in the next week or so. Stay tuned! :)

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:42 GMT

Content originally posted in LPCWare by waleed on Fri Mar 27 12:50:15 MST 2015
Is it possible that you might provide me with the initialization code to wake up the m0+ core?

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:42 GMT

Content originally posted in LPCWare by waleed on Fri Mar 27 13:23:09 MST 2015
In your last comment you mentioned that "(the keil .s startup file has the assembly code you are interested in)." I was able to find some startup files e.g cr_startup_lpc5410x-m0 and cr_startup_lpc5410x, but these files are not ".s files" they are ".c files".

I just want to confirm that when you said .s startup files, which files are you talking about? If you can give an example of such file by exact name it will be great.

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:43 GMT

Content originally posted in LPCWare by waleed on Sun Mar 29 10:45:01 MST 2015
This is what i think i need to do to enable the m0+ core.Kindly correct me if i am wrong:

1. Use RTC alarm since time-out can wake up the part from any of the low power
modes, including Deep power-down.

2. Configure the RTC as follows:

• Use the AHBCLKCTRL0 register (Table 51) to enable the clock to the RTC register
interface and peripheral clock.
• For RTC software reset use the RTC CTRL register. See Table 276.
• The RTC provides an interrupt to NVIC slot #29 for the RTC_WAKE and
RTC_ALARM functions.
• The RTC oscillator is always running, and therefore the 32 kHz output is always
available to be enabled for syscon clock generation (see Table 65). Once enabled, the
32 kHz clock can be selected for the system clock or be observed through the
CLKOUT pin. The 1 Hz output is enabled in the RTC CTRL register (RTC_EN bit).
Once the 1 Hz output is enabled, the 1 kHz output for the high-resolution wake-up
timer can be enabled.
• Enable the RTC oscillator that provides the RTC’s 1 Hz and 1 kHz clocks in the
syscon block. See Table 65

3. When the RTC timer value will reach a match value, an
interrupt will be raised. The alarm interrupt will wake up the part from any low power
mode if enabled.

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:43 GMT

Content originally posted in LPCWare by TheFallGuy on Sun Mar 29 12:40:53 MST 2015
Keil provide assembler startup files. Nxp provide C startup files in LPCXpresso. It is much easier to understand the c startup files.

Enabling the m0+ is just writing to a couple of registers, just look in and read the startup files. No need to use the RTC - that is far too complicated for a very simple task.

In fact why not just use LPCXpresso. It is free and uses Gcc. Why use anything else?

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:44 GMT

Content originally posted in LPCWare by waleed on Mon Mar 30 06:17:04 MST 2015
Hi TheFallGuy,

Thanks for the help...

Can you kindly provide me the name of the startup files which contain the code to enable m0+ core? it will be really helpful.

Actually i want to write the initialization code myself that is why i am not using LPCXpresso.

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:44 GMT

Content originally posted in LPCWare by nerd herd on Mon Mar 30 08:54:33 MST 2015
Hi waleed,

If your high level goal is to start with a project that successfully initializes the Cortex-M0+ core, please check out the multicore blinky example, whether in Keil MDK or LPCXpresso. This example does exactly what you need -- Cortex-M4 core takes the Cortex-M0+ core out of reset, and then both cores wake each other up and take turns blinking an LED. This can serve as the base of your application.

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:45 GMT

Content originally posted in LPCWare by waleed on Tue Mar 31 04:14:09 MST 2015
Hi NXP Technical Support,

Thanks for the help, i will take a look at it.

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:46 GMT

Content originally posted in LPCWare by waleed on Wed Apr 01 07:05:43 MST 2015
Hi NXP Technical Support,

I think i have enabled m0+ core but, i don't know how i can know that.

Can you kindly explain that, "is there a way to determine that m0+ core has been enabled". What i am trying to ask is that, are there any registers which i can read to know which cores are enabled?

Your help is much needed and appreciated. :)

Regards,
Muhammad Waleed

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:46 GMT

Content originally posted in LPCWare by nerd herd on Wed Apr 01 10:05:09 MST 2015
Hi waleed,

If by enabled you mean that the Cortex-M0+ core is executing your own code, I would recommend having the Cortex-M0+ core toggle a pin that you observe on an oscilloscope or LED. Are you using a custom board or LPCXpresso evaluation board?

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:47 GMT

Content originally posted in LPCWare by starblue on Thu Apr 02 00:50:08 MST 2015
You could take a look at AN11608 "Heart-Rate Monitor" page 7, until the updated user manual appears.

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:47 GMT

Content originally posted in LPCWare by TheFallGuy on Thu Apr 02 02:03:10 MST 2015
I think you mean AN11609?
http://www.nxp.com/documents/application_note/AN11609.zip

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:48 GMT

Content originally posted in LPCWare by starblue on Thu Apr 02 03:05:33 MST 2015
No, I mean AN11608.

As far as I can tell the information in AN11609 is also in the currently available user manual (which doesn't mean you shouldn't read it anyway), while AN11608 page 7 documents a register CPUCTRL that is not yet in the user manual.

Re: How can i enable m0+ core on NXP LPC54102 microcontroller?

lpcware — Wed, 15 Jun 2016 19:56:48 GMT

Content originally posted in LPCWare by waleed on Thu Apr 02 04:07:38 MST 2015
I am using LPCXpresso evaluation board.