I also use a UART and set the baud rate by the SystemCoreClock and
everything works ok.
I send by the UART the value of SystemCoreClock and is 50MHz (I use a
10MHz crystal and PLL).
I callSystemCoreClockUpdate() before as you sugestedbut there was no
chamges.
Thanks

Citando Daniel Widyanto :
>
>
>
> Hi,
>
> If you useSystemCoreClock(as inLPC_I2C->SCLH =
> (SystemCoreClock / 400000UL)), make sure you have called
> theSystemCoreClockUpdate() before. Otherwise,
> theSystemCoreClockwill showed 12Mhz, even though your MCU clock
> already configured to run at 48Mhz.
>
> Regards,
> -daniel
> ________________________________
> From: M. Manca
> To: l...[2]
> Sent: Thursday, May 31, 2012 2:33 AM
> Subject: Re: [lpc2000] LPC1114 I2C Problem
>
> Il 30/05/2012 19:15, r...@iol.pt[3] ha scritto:
> >
> >
> > Still doesn't work.
> > Thanks.
> >
> Is your hw proprietary or are you using some evaluation board? May you
> be interested to have a working example on a standard board?
> What IDE/compiler are you using?
> >
> >
> > Citando Phil Young > > >:
> > >
> > >
> > >
> > > Try this setting for the PIO control pins, I use it and it
> works fine.
> > >
> > > LPC_IOCON->PIO0_4 = 0xC1U; /* P0.4 = SCL */
> > > LPC_IOCON->PIO0_5 = 0xC1U; /* P0.5 = SDA */
> > >
> > > Regards
> > >
> > > Phil.
> > >
> > > From: l...[2]
> [1]
> > > [mailto:l...[2]
> > [1]] On Behalf Of
> > > r_goncalves2000
> > > Sent: 29 May 2012 18:14
> > > To: l...[2]
> [1]
> > > Subject: [lpc2000] LPC1114 I2C Problem
> > >
> > > (I've posted this message to LP1100 group but it was my
> > > intention to post
> > > anly here. Sorry)
> > >
> > > Hello All
> > > I'm having a bad time trying to communicate with a 24LC16 E2PROM.
> > > I've done this before with LPC2000 and LPC17xx micros with no
> > > problem, and
> > > it
> > > was no big deal.
> > > After a couple of days with this problem I'm running out of
> > > ideas on how to
> > > solve the problem and don't know if it's a software or
> > > hardware problem.
> > >
> > > My hardware is as follow:
> > > - LPC1114 pin 16 (SDA) connects to 24LC16 pin 5 (SDA)
> > > - LPC1114 pin 15 (SCL) connects to 24LC16 pin 6 (SCL)
> > > - Each line as a 2K7 pull-up resistor to 3V3
> > > - The board is a 4 layer board and the 24LC16 is 1cm away
> from the MCU.
> > >
> > > My I2C initialization routine for 400KHz is as follows:
> > > NVIC_DisableIRQ( I2C_IRQn ); /* Disable I2C-bus interrupts */
> > > g_ui32I2C_Flags = 0;
> > > LPC_SYSCON->PRESETCTRL |= 0x02U; /* De-assert the reset */
> > > LPC_SYSCON->SYSAHBCLKCTRL |= (0x01U << 5); /* Enable I2C clock */
> > > LPC_IOCON->PIO0_4 = 0x01U; /* P0.4 = SCL */
> > > LPC_IOCON->PIO0_5 = 0x01U; /* P0.5 = SDA */
> > > LPC_I2C->CONCLR = 0x6CU; /* Clear all I2C operation bits */
> > > LPC_I2C->SCLH = (SystemCoreClock / 400000UL);
> > > LPC_I2C->SCLH >>= 1U; /* Divide value by 2 (duty cycle of 50%) */
> > > if( LPC_I2C->SCLH < 4U )
> > > {
> > > LPC_I2C->SCLH = 4U; /* Value must be bigger than or equal to 4 */
> > > }
> > > LPC_I2C->SCLL = LPC_I2C->SCLH; /* Duty cycle of 50% */
> > > NVIC_EnableIRQ( I2C_IRQn ); /* Enable I2C-bus interface
> interrupts */
> > > LPC_I2C->CONSET = 0x40U; /* Enable I2C interface */
> > >
> > > At 400KHz I can't read nor write.
> > > I've tried 10KHz and most of the times I can read but most of
> > > the times I
> > > can't
> > > write.
> > > I know the I2C ISR is beeing trigered.
> > > I increment counters for each interruption an I can see that some
> > > interruptions
> > > are beeing fired.
> > >
> > > Any ideas to find were the problem is?
> > >
> > > Thanks.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> > Ligaes:
> > ---------
> > [1] mailto:lpc2000%40yahoogroups.com
> > [2]
> > mailto:p...@dsl.pipex.com[4]
> >
> ?subject=RE%3A%20%5Blpc2000%5D%20LPC1114%20I2C%20Problem
> > [3]
> > mailto:l...[2]
> >
> ?subject=RE%3A%20%5Blpc2000%5D%20LPC1114%20I2C%20Problem
> > [4]
> >
> http://groups.yahoo.com/group/lpc2000/post;_ylc=X3oDMTJybTdpNzlhBF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRtc2dJZAM1NzQxOARzZWMDZnRyBHNsawNycGx5BHN0aW1lAzEzMzgzMTU0NjI-?act=reply&messageNum=57418
> >
>
> > [5]
> >
> http://groups.yahoo.com/group/lpc2000/post;_ylc=X3oDMTJmdXJxYjUyBF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDZnRyBHNsawNudHBjBHN0aW1lAzEzMzgzMTU0NjI-
> > [6]
> >
> http://groups.yahoo.com/group/lpc2000/message/57416;_ylc=X3oDMTM3djU2Nm0xBF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRtc2dJZAM1NzQxOARzZWMDZnRyBHNsawN2dHBjBHN0aW1lAzEzMzgzMTU0NjIEdHBjSWQDNTc0MTY-
> > [7]
> >
> http://groups.yahoo.com/group/lpc2000/members;_ylc=X3oDMTJnbWdzcTc5BF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDdnRsBHNsawN2bWJycwRzdGltZQMxMzM4MzE1NDYy?o=6
> > [8]
> >
> http://groups.yahoo.com/group/lpc2000;_ylc=X3oDMTJmZjlqajhvBF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDdnRsBHNsawN2Z2hwBHN0aW1lAzEzMzgzMTU0NjI-
> > [9]
> >
> http://groups.yahoo.com/;_ylc=X3oDMTJlMHQxODBoBF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDZnRyBHNsawNnZnAEc3RpbWUDMTMzODMxNTQ2Mg--
> > [10]
> > mailto:l...[5]
> >
> ?subject=Change%20Delivery%20Format:%20Traditional
> > [11] mailto:l...[6]
> >
> ?subject=Email%20Delivery:%20Digest
> > [12] mailto:l...[7]
> > ?subject=Unsubscribe
> > [13] http://docs.yahoo.com/info/terms/
> >
> >
> >
> >
>
>
>
>


Start a New Thread

That was not the problem.
But thank you very much to point this issue to my attention.
Thisis the type of thing that when happens cantaketime to discover.
I will take extra care in the future writing to registers.

Citando bigft_id :
> I looked at your code, and I am not surprised... :-) Your tidbit
> below may write all kinds of stuff into LPC_I2C->SCLH. Using a
> peripheral register as general variable is bad form... sometimes
> writing bad value hangs the whole peripheral. Try:
>
> unsigned long CookingTheClock = SystemCoreClock / 8000000;
> if ( CookingTheClock < 4 )
> CookingTheClock = 4;
>
> LPC_I2C->SCLH = CookingTheClock;
> LPC_I2C->SCLH = CookingTheClock;
>
> and see if that works...
>> LPC_I2C->SCLH = (SystemCoreClock / 400000UL);
>> LPC_I2C->SCLH >>= 1U; /* Divide value by 2 (duty cycle of 50%) */
>> if( LPC_I2C->SCLH < 4U )
>> {
>> LPC_I2C->SCLH = 4U; /* Value must be bigger than or equal to 4 */
>> }
>> LPC_I2C->SCLL = LPC_I2C->SCLH; /* Duty cycle of 50% */
> --- In l..., Daniel Widyanto
> wrote: > Hi,
>>
>> If you use�SystemCoreClock�(as in�LPC_I2C->SCLH =
>> (SystemCoreClock / 400000UL)�), make sure you have called
>> the�SystemCoreClockUpdate() before. Otherwise,
>> the�SystemCoreClock�will showed 12Mhz, even though your MCU
>> clock already configured to run at 48Mhz.
>>
>> Regards,
>> -daniel
>> ________________________________
>> From: M. Manca
>> To: l...
>> Sent: Thursday, May 31, 2012 2:33 AM
>> Subject: Re: [lpc2000] LPC1114 I2C Problem
>>
>> Il 30/05/2012 19:15, rpsgoncalves@... ha scritto:
>> �
>>
>> Still doesn't work.
>> Thanks.
>>
>> Is your hw proprietary or are you using some evaluation board? May you
>> be interested to have a working example on a standard board?
>> What IDE/compiler are you using?
>> Citando Phil Young >> >:
>> >
>> >�
>> >
>> > Try this setting for the PIO control pins, I use it and it works fine.
>> >
>> > LPC_IOCON->PIO0_4 = 0xC1U; /* P0.4 = SCL */
>> > LPC_IOCON->PIO0_5 = 0xC1U; /* P0.5 = SDA */
>> >
>> > Regards
>> >
>> > Phil.
>> >
>> > From: l... [1]
>> > [mailto:l...
>> [1]] On Behalf Of
>> > r_goncalves2000
>> > Sent: 29 May 2012 18:14
>> > To: l... [1]
>> > Subject: [lpc2000] LPC1114 I2C Problem
>> >
>> > (I've posted this message to LP1100 group but it was my
>> > intention to post
>> > anly here. Sorry)
>> >
>> > Hello All
>> > I'm having a bad time trying to communicate with a 24LC16 E2PROM.
>> > I've done this before with LPC2000 and LPC17xx micros with no
>> > problem, and
>> > it
>> > was no big deal.
>> > After a couple of days with this problem I'm running out of
>> > ideas on how to
>> > solve the problem and don't know if it's a software or
>> > hardware problem.
>> >
>> > My hardware is as follow:
>> > - LPC1114 pin 16 (SDA) connects to 24LC16 pin 5 (SDA)
>> > - LPC1114 pin 15 (SCL) connects to 24LC16 pin 6 (SCL)
>> > - Each line as a 2K7 pull-up resistor to 3V3
>> > - The board is a 4 layer board and the 24LC16 is 1cm away from the MCU.
>> >
>> > My I2C initialization routine for 400KHz is as follows:
>> > NVIC_DisableIRQ( I2C_IRQn ); /* Disable I2C-bus interrupts */
>> > g_ui32I2C_Flags = 0;
>> > LPC_SYSCON->PRESETCTRL |= 0x02U; /* De-assert the reset */
>> > LPC_SYSCON->SYSAHBCLKCTRL |= (0x01U << 5); /* Enable I2C clock */
>> > LPC_IOCON->PIO0_4 = 0x01U; /* P0.4 = SCL */
>> > LPC_IOCON->PIO0_5 = 0x01U; /* P0.5 = SDA */
>> > LPC_I2C->CONCLR = 0x6CU; /* Clear all I2C operation bits */
>> > LPC_I2C->SCLH = (SystemCoreClock / 400000UL);
>> > LPC_I2C->SCLH >>= 1U; /* Divide value by 2 (duty cycle of 50%) */
>> > if( LPC_I2C->SCLH < 4U )
>> > {
>> > LPC_I2C->SCLH = 4U; /* Value must be bigger than or equal to 4 */
>> > }
>> > LPC_I2C->SCLL = LPC_I2C->SCLH; /* Duty cycle of 50% */
>> > NVIC_EnableIRQ( I2C_IRQn ); /* Enable I2C-bus interface interrupts */
>> > LPC_I2C->CONSET = 0x40U; /* Enable I2C interface */
>> >
>> > At 400KHz I can't read nor write.
>> > I've tried 10KHz and most of the times I can read but most of
>> > the times I
>> > can't
>> > write.
>> > I know the I2C ISR is beeing trigered.
>> > I increment counters for each interruption an I can see that some
>> > interruptions
>> > are beeing fired.
>> >
>> > Any ideas to find were the problem is?
>> >
>> > Thanks.
>> >
>> >
>> >�
>> >
>> >
>> >
>> >
>>
>> Liga��es:
>> ---------
>> [1] mailto:lpc2000%40yahoogroups.com
>> [2]
>> mailto:philipjyoung@...
>>
>> ?subject=RE%3A%20%5Blpc2000%5D%20LPC1114%20I2C%20Problem
>> [3]
>> mailto:l...
>>
>> ?subject=RE%3A%20%5Blpc2000%5D%20LPC1114%20I2C%20Problem
>> [4]
>> http://groups.yahoo.com/group/lpc2000/post;_ylc=X3oDMTJybTdpNzlhBF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRtc2dJZAM1NzQxOARzZWMDZnRyBHNsawNycGx5BHN0aW1lAzEzMzgzMTU0NjI-?act=reply&messageNum=57418
>>
>>
>> [5]
>> http://groups.yahoo.com/group/lpc2000/post;_ylc=X3oDMTJmdXJxYjUyBF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDZnRyBHNsawNudHBjBHN0aW1lAzEzMzgzMTU0NjI-
>> [6]
>> http://groups.yahoo.com/group/lpc2000/message/57416;_ylc=X3oDMTM3djU2Nm0xBF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRtc2dJZAM1NzQxOARzZWMDZnRyBHNsawN2dHBjBHN0aW1lAzEzMzgzMTU0NjIEdHBjSWQDNTc0MTY-
>> [7]
>> http://groups.yahoo.com/group/lpc2000/members;_ylc=X3oDMTJnbWdzcTc5BF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDdnRsBHNsawN2bWJycwRzdGltZQMxMzM4MzE1NDYy?o=6
>> [8]
>> http://groups.yahoo.com/group/lpc2000;_ylc=X3oDMTJmZjlqajhvBF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDdnRsBHNsawN2Z2hwBHN0aW1lAzEzMzgzMTU0NjI-
>> [9]
>> http://groups.yahoo.com/;_ylc=X3oDMTJlMHQxODBoBF9TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDZnRyBHNsawNnZnAEc3RpbWUDMTMzODMxNTQ2Mg--
>> [10]
>> mailto:l...
>>
>> ?subject=Change%20Delivery%20Format:%20Traditional
>> [11] mailto:l...
>>
>> ?subject=Email%20Delivery:%20Digest
>> [12] mailto:l...
>> ?subject=Unsubscribe
>> [13] http://docs.yahoo.com/info/terms/
>>
>>
>>
>>
>>
>>
>>
>> Start a New Thread

Thanks Phil

This is good advise.

I solved the problem.
Aparently it was not software but hardware.
I was developing the software in one board, aparently that board was bad.
I then tried the software on a second board, but the software was
changed and didn't work so I thought the problem was software.
I decided to start again with the unchanged software on a new board and
it start working as expected.

Thanks also to Manca and Alexan_e for the suport.

Rui

Citando Phil Young :
>
>
>
> The easiest thing for you to do is download the Keil tools, you can get a
> free license that is limited by code size but is big enough
> for any LPC1114
> project.
>
> Then compile your code and run it in the simulator, that will
> let you single
> step and view all the peripherals as simulated blocks, and
> also give you
> detailed status displays for them including clock frequency etc.
>
> It should then be instantly apparent what you are doing wrong.
>
> Regards
>
> Phil.
>
> -----Original Message-----
> From: l...[1]
> [mailto:l...[1]] On Behalf Of
> r...@iol.pt[2]
> Sent: 30 May 2012 18:21
> To: l...[1]
> Subject: Re: [lpc2000] Re: LPC1114 I2C Problem
>
> I could not determine that because I can not see the clock.
>
> I try to defineP0.4 and P0.5 as outputs but could not toggle them in a
> timer!
> But after setting them to outputsand can set them high or low, but no
> toggle in a timer, but I can toglle a led whit no problem!
> This week is a complete disaster!
>
> Could it be something related to the compilation?
> I tried another board with an LPC11C14 and the behaviour is different
> but it doesn't no work.
>
> Citando Kevin :
> >
> >
> >
> > Have you confirmed that your bitrate is good, you can check with
> > either an logic analyzer or an oscilloscope.
> > Check if the rate and size of your clock pulses are good.
> >
> > --- In l...[1][1], "r_goncalves2000"
> > wrote:
> > >
> > > (I've posted this message to LP1100 group but it was my
> > intention to post anly here. Sorry)
> > >
> > > Hello All
> > > I'm having a bad time trying to communicate with a 24LC16 E2PROM.
> > > I've done this before with LPC2000 and LPC17xx micros with no
> > problem, and it
> > > was no big deal.
> > > After a couple of days with this problem I'm running out of
> > ideas on how to
> > > solve the problem and don't know if it's a software or
> > hardware problem.
> > >
> > > My hardware is as follow:
> > > - LPC1114 pin 16 (SDA) connects to 24LC16 pin 5 (SDA)
> > > - LPC1114 pin 15 (SCL) connects to 24LC16 pin 6 (SCL)
> > > - Each line as a 2K7 pull-up resistor to 3V3
> > > - The board is a 4 layer board and the 24LC16 is 1cm away from
> > the MCU.
> > >
> > > My I2C initialization routine for 400KHz is as follows:
> > > NVIC_DisableIRQ( I2C_IRQn ); /* Disable I2C-bus interrupts */
> > > g_ui32I2C_Flags = 0;
> > > LPC_SYSCON->PRESETCTRL |= 0x02U; /* De-assert the reset */
> > > LPC_SYSCON->SYSAHBCLKCTRL |= (0x01U << 5); /* Enable I2C clock */
> > > LPC_IOCON->PIO0_4 = 0x01U; /* P0.4 = SCL */
> > > LPC_IOCON->PIO0_5 = 0x01U; /* P0.5 = SDA */
> > > LPC_I2C->CONCLR = 0x6CU; /* Clear all I2C operation bits */
> > > LPC_I2C->SCLH = (SystemCoreClock / 400000UL);
> > > LPC_I2C->SCLH >>= 1U; /* Divide value by 2 (duty cycle of 50%) */
> > > if( LPC_I2C->SCLH < 4U )
> > > {
> > > LPC_I2C->SCLH = 4U; /* Value must be bigger than or equal to 4 */
> > > }
> > > LPC_I2C->SCLL = LPC_I2C->SCLH; /* Duty cycle of 50% */
> > > NVIC_EnableIRQ( I2C_IRQn ); /* Enable I2C-bus interface interrupts
> */
> > > LPC_I2C->CONSET = 0x40U; /* Enable I2C interface */
> > >
> > > At 400KHz I can't read nor write.
> > > I've tried 10KHz and most of the times I can read but most of
> > the times I can't
> > > write.
> > > I know the I2C ISR is beeing trigered.
> > > I increment counters for each interruption an I can see that
> > some interruptions
> > > are beeing fired.
> > >
> > > Any ideas to find were the problem is?
> > >
> > > Thanks.
> > >
> >
> >
> >
> >
> > Ligações:
> ---------
> [1] mailto:lpc2000%40yahoogroups.com
> [2]
> mailto:l...@slomotion.nl[3]?subject=Re%3A%20LPC1114%20I2C%20Problem
> [3]
> mailto:l...[1]?subject=Re%3A%20LPC1114%20I2C%20Problem
> [4]
> http://groups.yahoo.com/group/lpc2000/post;_ylc=X3oDMTJybnYxMzU5BF9TAzk3MzU5
>
> NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRtc2dJZAM1NzQxNwRzZWMDZnRy
> BHNsawNycGx5BHN0aW1lAzEzMzgzMTI1MTY-?act=reply&messageNum=57417
> [5]
> http://groups.yahoo.com/group/lpc2000/post;_ylc=X3oDMTJma2tjM2VkBF9TAzk3MzU5
>
> NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDZnRyBHNsawNudHBjBHN0
> aW1lAzEzMzgzMTI1MTY-
> [6]
> http://groups.yahoo.com/group/lpc2000/message/57416;_ylc=X3oDMTM3YXQyOTFpBF9
>
> TAzk3MzU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRtc2dJZAM1NzQxNwR
> zZWMDZnRyBHNsawN2dHBjBHN0aW1lAzEzMzgzMTI1MTYEdHBjSWQDNTc0MTY-
> [7]
> http://groups.yahoo.com/group/lpc2000/members;_ylc=X3oDMTJna2w4MmEzBF9TAzk3M
>
> zU5NzE0BGdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDdnRsBHNsawN2bWJyc
> wRzdGltZQMxMzM4MzEyNTE2?o=6
> [8]
> http://groups.yahoo.com/group/lpc2000;_ylc=X3oDMTJmbHJtMjZ2BF9TAzk3MzU5NzE0B
>
> GdycElkAzExNDUzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDdnRsBHNsawN2Z2hwBHN0aW1lA
> zEzMzgzMTI1MTY-
> [9]
> http://groups.yahoo.com/;_ylc=X3oDMTJlM2RpZnEyBF9TAzk3MzU5NzE0BGdycElkAzExND
>
> UzMTY2BGdycHNwSWQDMTcwNjU1NDIwNQRzZWMDZnRyBHNsawNnZnAEc3RpbWUDMTMzODMxMjUxNg
> --
> [10]
>
> mailto:l...[4]?subject=Change%20Delivery%20Forma
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> [11]
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> [13] http://docs.yahoo.com/info/terms/
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>
>


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