topic Re: Problem with RTC Oscilator in LPCXpresso IDE

Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:44 GMT

Content originally posted in LPCWare by Albert on Mon Jan 31 06:53:39 MST 2011
Hi!

I have a doubt about the use of RTC oscillator.

I tried to use the RTC oscillator to provide sinal clock to the CPU and USB, but my code din't work.

I tested this code in the LPCXpresso IDE with the LPCXpresso with LPC1768 target.

Somebody can point the problem with my code? Here it is.

LPC_SC->CLKSRCSEL = 2;//RTC -> PLL0
LPC_SC->PLL0CFG   = 5126; // Fcc0 = 480MHz
LPC_SC->PLL0FEED = 0xAA; //Feed sequence
LPC_SC->PLL0FEED = 0x55; //Feed sequence
LPC_SC->PLL0CON   = 0x01; //PLL0 Enable
LPC_SC->PLL0FEED = 0xAA; //Feed sequence
LPC_SC->PLL0FEED = 0x55; //Feed sequence
while ((LPC_SC->PLL0STAT & (1<<26))==0); //Wait until stable. PROBLEM IT IS NEVER STABLE.

LPC_SC->PLL0CON   = 0x03; //PLL0 Enable and Conect
LPC_SC->PLL0FEED = 0xAA;//Feed sequence
LPC_SC->PLL0FEED = 0x55;//Feed sequence
while ((LPC_SC->PLL0STAT & ((1<<25) | (1<<24)))==0); //Wait until stable.

Thanks!

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:45 GMT

Content originally posted in LPCWare by Ex-Zero on Mon Jan 31 08:53:05 MST 2011
Sorry can't show you the problem, this code is working :eek:

1. You've copied successfully PLL0_Setup (in SystemInit)

2. You've successfully found a valid PLL0 multiplier (5127) to FCCO = 336MHz

So you're code is valid and running on my LPCXpresso board without problem. With CCLKSEL = 3 in CCLKCFG you've set CCLK = FCC0 / 4 = 84MHz
After changing PLL0 you are not able to debug with LPCXpresso, so you have to scope CCLK via CLKOUT pin (P1.27):

//clkout (P1.27) to cpu clock
LPC_PINCON->PINSEL3 &=~(3<<22);
LPC_PINCON->PINSEL3 |= (1<<22);
LPC_SC->CLKOUTCFG = (1<<8)|(9<<4); //enable and divide by 10

If you scope P1.27 (P$10, see LPCXpresso schematic) you will see about 8.4 MHz

Note: I've used a new CMSIS Project with RedLib(nohost)

To check if your RTC is running, scope RTCX1 (PIN16):

http://www.flickr.com/photos/58892165@N08/5404612079/

Use a 10X probe and switch the scope to AC coupling

http://www.flickr.com/photos/58892165@N08/5405217100/

Then you should see a small 32kHz signal:

http://www.flickr.com/photos/58892165@N08/5405217182/

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:45 GMT

Content originally posted in LPCWare by Albert on Mon Jan 31 10:52:49 MST 2011
Hi Zero,

I do what you advice, but didn't work too.

Then, I just write the code below and see that the RTC clock signal on the pin P1.27 is horrible. My LPCXpresso is REV A and yours?

    //clkout (P1.27) to RTC clock
    LPC_PINCON->PINSEL3 &=~(3<<22);
    LPC_PINCON->PINSEL3 |= (1<<22);
    LPC_SC->CLKOUTCFG = (1<<8)|(1<<2);

Somebody have alrealy passed for the same problem? How to fix it?

Thanks.

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:46 GMT

Content originally posted in LPCWare by Ex-Zero on Mon Jan 31 11:03:52 MST 2011
Should look like this:

http://www.flickr.com/photos/58892165@N08/5405263988/

Board: LPCXpresso 1769 REV B

What do you mean with horrible

Does it show the correct frequency?

Is your RTC crystal working?

If your RTC crystal isn't working, it's a hardware problem. So try to init your RTC with

#define CCR_CLKEN 0x01
 
void RTC_init(void) //init RTC
{
 LPC_SC->PCONP |= (1<<9); //power on RTC
 LPC_RTC->CCR =0; //stop RTC
 LPC_RTC->AMR =0; //no alarm
 LPC_RTC->CIIR =0; //no second interrupt
 LPC_RTC->CCR |= CCR_CLKEN ;
}

and read or debug LPC_RTC->SEC in a simple new project.

[LEFT]Together with your scope results you should be able to find a broken crystal.[/LEFT]

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:47 GMT

Content originally posted in LPCWare by Albert on Mon Jan 31 12:55:39 MST 2011
I resolder the pads of the cristal 32.768KHz and now the signal is stable, but my configuration persist on not working.

Here my completly code.

#ifdef __USE_CMSIS
#include "LPC17xx.h"
#endif

int main(void)
{
     LPC_SC->CLKSRCSEL = 2;//RTC -> PLL0
    LPC_SC->PLL0CFG = 5127; // Fcc0 = 336MHz
    LPC_SC->PLL0FEED = 0xAA; //Feed sequence
    LPC_SC->PLL0FEED = 0x55; //Feed sequence
    LPC_SC->PLL0CON = 0x01; //PLL0 Enable- NOW THE PROBLEM IS HERE.
    LPC_SC->PLL0FEED = 0xAA; //Feed sequence
    LPC_SC->PLL0FEED = 0x55; //Feed sequence
    while ((LPC_SC->PLL0STAT & (1<<26))==0); //Wait until stable.

    LPC_SC->PLL0CON = 0x03; //PLL0 Enable and conect
    LPC_SC->PLL0FEED = 0xAA;//Feed sequence
    LPC_SC->PLL0FEED = 0x55;//Feed sequence
    while ((LPC_SC->PLL0STAT & ((1<<25) | (1<<24)))==0); //Wait until stab

    //CPU = 84MHz
    LPC_SC->CCLKCFG   = 3; //C_CLK = 336/4 = 84MHz

    //clkout (P1.27) to cpu clock
    LPC_PINCON->PINSEL3 &=~(3<<22);
    LPC_PINCON->PINSEL3 |= (1<<22);
    LPC_SC->CLKOUTCFG = (1<<8)|(9<<4); //enable and divide by 10 CCLK = 8.4MHz

while(1);

return 0 ;
}

I don't understand, because if I change the oscillator (IRC and Main) work very well, but with the RTC not, and now, the RTC oscilator work very well.

On debug, with RTC oscillator the problem appear when the debugger execute the first instruction "LPC_SC->PLL0CON = 0x01".

If I just save on my LPC1768, the pin 1.27 is always +-3.3V.

May be the problem is the configuration of LPCXpresso IDE. What do you think?

Thanks for the help.

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:47 GMT

Content originally posted in LPCWare by Ex-Zero on Mon Jan 31 13:05:42 MST 2011
If you export and attach your complete project, I could import and test it within 5 minutes. So we could avoid something like unintended wrong settings.

Also you can set CLKOUT to RTC output with:

[LEFT]// RTC CLKOUT
LPC_PINCON->PINSEL3 &=~(3<<22);
LPC_PINCON->PINSEL3 |= (1<<22);[/LEFT]
LPC_SC->CLKOUTCFG = (1<<8)|(1<<2); //clockout:RTC 1:1

and 32kHz signal should be shown at P1.27 before you try to switch PLL0.

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:48 GMT

Content originally posted in LPCWare by Albert on Mon Jan 31 13:18:04 MST 2011
Good idea. How can I attach the file on this Forum?

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:48 GMT

Content originally posted in LPCWare by Albert on Mon Jan 31 13:21:00 MST 2011
I have already done this test ando work very well. I saw the 32KHz wave form.

[LEFT]// TODO: insert code here
LPC_PINCON->PINSEL3 &=~(3<<22);
LPC_PINCON->PINSEL3 |= (1<<22);[/LEFT]
LPC_SC->CLKOUTCFG = (1<<8)|(1<<2); //clockout:RTC 1:1

This test OK.

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:49 GMT

Content originally posted in LPCWare by Ex-Zero on Mon Jan 31 13:21:07 MST 2011
FAQ & Search:attach

http://knowledgebase.nxp.com/faq.php?s=&do=search&q=attach&match=all&titlesonly=0

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:50 GMT

Content originally posted in LPCWare by Albert on Mon Jan 31 13:24:46 MST 2011
Here the project

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:50 GMT

Content originally posted in LPCWare by Albert on Mon Jan 31 13:31:14 MST 2011
Here it is.

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:51 GMT

Content originally posted in LPCWare by Ex-Zero on Mon Jan 31 13:36:43 MST 2011
That are several projects :confused:
Which of this projects are we talking about?

New version can't be downloaded, it's invalid!!

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:52 GMT

Content originally posted in LPCWare by Albert on Mon Jan 31 13:43:35 MST 2011
Sorry, I attached the wrong project. :D

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:52 GMT

Content originally posted in LPCWare by Albert on Mon Jan 31 14:06:59 MST 2011
Here the CMSIS

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:53 GMT

Content originally posted in LPCWare by Ex-Zero on Mon Jan 31 14:37:57 MST 2011
Good news and bad news:

Your project isn't running on my LPCXpresso, so try this:

[ATTACH]294[/ATTACH]

I've changed MCU settings from 1769 to 1768 already.

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:53 GMT

Content originally posted in LPCWare by Albert on Mon Jan 31 21:09:38 MST 2011
Hi Zero,

I tried to compile the project, but the program didn't found the two files.

#include <cr_section_macros.h>
#include <NXP/crp.h>

I search on the internet, but I didn't found, can you send me the two files, please.

Thanks.

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:54 GMT

Content originally posted in LPCWare by Ex-Zero on Mon Jan 31 21:29:11 MST 2011
This files are included in LPCXpresso 3.6.

See properties->C/C++ General->Paths and Symbols

Change this include directories to your own folder setting, then clean / rebuild project.

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:55 GMT

Content originally posted in LPCWare by CodeRedSupport on Tue Feb 01 00:24:32 MST 2011

Quote: Albert

I tried to compile the project, but the program didn't found the two files.

#include <cr_section_macros.h>
#include <NXP/crp.h>

As Zero says, these files are provided as part of LPCXPresso 3.6.x.

For more details, please see:

http://support.code-red-tech.com/CodeRedWiki/EnhancedManagedLinkScripts

Regards,
CodeRedSupport

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:55 GMT

Content originally posted in LPCWare by Albert on Tue Feb 01 09:20:23 MST 2011
Hi Zero and CodeRedSupport,

Unfortunately the code didn't work with the LPCXpresso 3.6.1 too, the problem persist even when freerunning without jtag debugg & LPC-link

I try to change the code accordingly with the manual, but when I try to change to RTC oscillator the LPCXpresso IDE send a message "16: Target Error from status-poll: System rejected access at location 0xE000EDF0 - verify population of memory and peripherals." follow the other message "15: Target error from Register access Cannot complete transaction, even after slowing speed."

Code:
#ifdef __USE_CMSIS
#include "LPC17xx.h"
#endif

#include <cr_section_macros.h>
#include <NXP/crp.h>

// Variable to store CRP value in. Will be placed automatically
// by the linker when "Enable Code Read Protect" selected.
// See crp.h header for more information
__CRP const unsigned int CRP_WORD = CRP_NO_CRP ;

int main(void) {

    //Main oscillator
    //M=100
    //N=6
    //C_CLK = 100MHz
    //CLKOUT = 10MHz
    // TODO: insert code here
    LPC_PINCON->PINSEL3 &=~(3<<22);
    LPC_PINCON->PINSEL3 |= (1<<22);
    LPC_SC->CLKOUTCFG = (1<<8)|(9<<4); //enable and divide by 10
    //HERE I SEE ON OSCILLOSCOPE CLKOUT = 10MHz OK

    LPC_SC->PLL0CON = 0x01; //PLL0 disconnected and enable
    LPC_SC->PLL0FEED = 0xAA; //Feed sequence
    LPC_SC->PLL0FEED = 0x55; //Feed sequence

    LPC_SC->PLL0CON = 0x00; //PLL0 disconnected and disable
    LPC_SC->PLL0FEED = 0xAA; //Feed sequence
    LPC_SC->PLL0FEED = 0x55; //Feed sequence

    LPC_SC->CCLKCFG = 3; //C_CLK = 3MHz
    //HERE I SEE ON OSCILLOSCOPE CLKOUT = 300KHz OK

    LPC_SC->CLKSRCSEL = 2; //RTC -> PLL0 - THE DEBUGGER DON'T BE ABLE TO CHANGE toTHIS SOURCE. "Message 16 and 15"

    LPC_SC->PLL0CFG = 5127; // Fcc0 = 336 MHz
    LPC_SC->PLL0FEED = 0xAA; //Feed sequence
    LPC_SC->PLL0FEED = 0x55; //Feed sequence

    LPC_SC->CCLKCFG = 3; //C_CLK = 336/4 = 84MHz

    LPC_SC->PLL0CON = 0x01; //PLL0 Enable
    LPC_SC->PLL0FEED = 0xAA; //Feed sequence
    LPC_SC->PLL0FEED = 0x55; //Feed sequence
    while ((LPC_SC->PLL0STAT & (1<<26))==0); //Wait until stable.

    LPC_SC->PLL0CON = 0x03; //PLL0 Enable and Conect
    LPC_SC->PLL0FEED = 0xAA;//Feed sequence
    LPC_SC->PLL0FEED = 0x55;//Feed sequence
    while ((LPC_SC->PLL0STAT & ((1<<25) | (1<<24)))==0); //Wait until stable.

    // Enter an infinite loop, just incrementing a counter
    volatile static int i = 0 ;
    while(1) {
        i++ ;
    }
    return 0 ;
}

Re: Problem with RTC Oscilator

lpcware — Thu, 16 Jun 2016 02:50:56 GMT

Content originally posted in LPCWare by Ex-Zero on Tue Feb 01 09:39:31 MST 2011
And can you see a valid clockout signal at P1.27?

After changing PLL0, you are 'destroying' your debug connection.:eek:

If you are not able to program / debug your board, don't panic.Just use bootloader to get your board in programmable state:

1. Disconnect USB.

2. Set P2[10] low (see LPCXpresso schematic) = next start with bootloader

3. Connect USB. Now bootloader is started. That's a stable configuration to program your board again with LPCXpresso.

4. Release P2[10] again = next start without bootloader

5. Cycle USB and your board is 'alive' again :)