(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.

Start a New Thread

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..., "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.
>

Start a New Thread

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... [mailto:l...] On Behalf Of
r_goncalves2000
Sent: 29 May 2012 18:14
To: l...
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.



Start a New Thread

Still doesn't work.
Thanks.

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.
>
>
>  
>
>

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Start a New Thread

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], "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.
> >
>
>
>

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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... [mailto:l...] On Behalf Of
r...@iol.pt
Sent: 30 May 2012 18:21
To: l...
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], "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.
> >
>
>
>

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Also consided downloading the LPC11xx code bundle to check the I2C examples included there

http://www.lpcware.com/content/nxpfile/sample-code-bundle-lpc11xx-peripherals-using-keils-mdk-arm

Alex

----- Original Message -----
From: Phil Young
To: l...
Sent: Wednesday, May 30, 2012 8:45 PM
Subject: RE: [lpc2000] Re: LPC1114 I2C Problem

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.



Start a New Thread

Il 30/05/2012 19:15, r...@iol.pt 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.
> >
> >
> >
> >
> >
> >
> > Ligações:
> ---------
> [1] mailto:lpc2000%40yahoogroups.com
> [2]
> mailto:p...@dsl.pipex.com
> ?subject=RE%3A%20%5Blpc2000%5D%20LPC1114%20I2C%20Problem
> [3]
> mailto:l...
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> [4]
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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...
Sent: Thursday, May 31, 2012 2:33 AM
Subject: Re: [lpc2000] LPC1114 I2C Problem

Il 30/05/2012 19:15, r...@iol.pt 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.
> >
> >
> >
> >
> >
> >
> > Ligaes:
> ---------
> [1] mailto:lpc2000%40yahoogroups.com
> [2]
> mailto:p...@dsl.pipex.com
> ?subject=RE%3A%20%5Blpc2000%5D%20LPC1114%20I2C%20Problem
> [3]
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> ?subject=RE%3A%20%5Blpc2000%5D%20LPC1114%20I2C%20Problem
> [4]
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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:
> > ---------
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> > [2]
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> > ?subject=RE%3A%20%5Blpc2000%5D%20LPC1114%20I2C%20Problem
> > [3]
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