LPC1549 ADCx FLAGS register read only in LPCxpresso V8.2

[michelkuenemann]

Hi all,

I am using ADC1 of an LPC1549 in sequential mode. My LPCxresso version is:

LPCXpresso v8.2.0 [Build 647] [2016-07-18] 

UM10736 rev 1.1 Page 509/759 says:

Bit 28 SEQA_INT Sequence A interrupt/DMA trigger.

"If the MODE bit in the SEQA_CTRL register is 1, this flag will be set upon completion of an
entire A sequence. In this case it must be cleared by writing a 1 to this SEQA_INT bit."

In my interrupt routine (void ADC1_SEQA_IRQHandler (void)) I have added following line :

 LPC_ADC1->FLAGS |= ( 1 << 28);

LPCxpresso complains with the following message: error: assignment of read-only member 'FLAGS'

So currently I have to clear this bit "by hand" with the following code (if I do not do it, the proc is stuck in the interrupt routine) :

// ADC1 flags register address

ulong *p = (ulong *) 0x40080068; 
ulong q;

q = *p;
q |= (1<< 28);
*p = q;

Is there an issue in LPCxpresso or have I missed something ?

Thanks you,

Regards,

Michel Kuenemann

[thefallguy · Accepted solution]

That will be a problem with the ADC include file, nothing to do with lpcxpresso. Where did the include file come from? Lpcopen? If this really is an error, you can just edit the file yourself to fix it. And report it to the appropriate forum for somebody in nxp to fix permanently.

[michelkuenemann]

Hello,

Thanks for your help:

1 - YES, the files comes from LPCopen

2 - I have patched the file like this

Was:  __I  uint32_t  FLAGS;  

Is:  __IO  uint32_t  FLAGS;  

this has fixed the issue.

On which forum should I report this issue ?

Michel