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Hi, I am working with the UART1 of the LPC2106 using the UARTecho sample program with the KickStart board from IAR. The UART keeps generating the character time-out indicator interrupt. I have looked through all of the documentation from Philips and I cannot find an explanation of what actually causes this interrupt. Does it mean that a stop bit was not found in nine bit times from the start bit? Does it mean that the receive FIFO overran? Is this lack of a clear and concise explanation indicative of Philips documentation? I am new to the LPC210x family, so please excuse my lack of understanding if the answer is obvious. I have worked mostly with Motorola micros and there documentation seems more concise. Thanks, Bob Davis |
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What is the UART CTI Interrupt?
Started by ●April 6, 2004
Reply by ●April 6, 20042004-04-06
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At 11:43 AM 4/6/04 -0400, you wrote: >I am working with the UART1 of the LPC2106 using the UARTecho sample >program with the KickStart board from IAR. The UART keeps generating the >character time-out indicator interrupt. I have looked through all of the >documentation from Philips and I cannot find an explanation of what >actually causes this interrupt. Does it mean that a stop bit was not found >in nine bit times from the start bit? Does it mean that the receive FIFO >overran? Is this lack of a clear and concise explanation indicative of >Philips documentation? I am new to the LPC210x family, so please excuse my >lack of understanding if the answer is obvious. I have worked mostly with >Motorola micros and there documentation seems more concise. Philips defers to the 16550 documentation for detailed explanations. See for example http://www.national.com/pf/PC/PC16550D.html#Datasheet or http://www-us16.semiconductors.com/pip/SC16C550IA44.html The CTI essentially means that there are characters in the receive FIFO but not enough to pass the threshold and there are no characters coming in. Robert " 'Freedom' has no meaning of itself. There are always restrictions, be they legal, genetic, or physical. If you don't believe me, try to chew a radio signal. " Kelvin Throop, III |
Reply by ●April 6, 20042004-04-06
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Bob, take a look at the User Manual, p.89. Not too bad an explanation. ;-) -uwe ----- Original Message ----- From: "Robert Davis" <> To: <> Sent: Tuesday, April 06, 2004 5:43 PM Subject: [lpc2000] What is the UART CTI Interrupt? > Hi, > > I am working with the UART1 of the LPC2106 using the UARTecho sample program with the KickStart board from IAR. The UART keeps generating the character time-out indicator interrupt. I have looked through all of the documentation from Philips and I cannot find an explanation of what actually causes this interrupt. Does it mean that a stop bit was not found in nine bit times from the start bit? Does it mean that the receive FIFO overran? Is this lack of a clear and concise explanation indicative of Philips documentation? I am new to the LPC210x family, so please excuse my lack of understanding if the answer is obvious. I have worked mostly with Motorola micros and there documentation seems more concise. > > Thanks, > Bob Davis > > > Yahoo! Groups Links > |
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Reply by ●April 6, 20042004-04-06
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You are right Uwe. I missed it. It was right under my nose ;) Thank you, Bob Davis --- In , "Uwe Arends" <Uwe_Arends@o...> wrote: > Bob, > > take a look at the User Manual, p.89. Not too bad an explanation. ;- ) > > -uwe > > ----- Original Message ----- > From: "Robert Davis" <rdavis@I...> > To: <> > Sent: Tuesday, April 06, 2004 5:43 PM > Subject: [lpc2000] What is the UART CTI Interrupt? > > Hi, > > > > I am working with the UART1 of the LPC2106 using the UARTecho sample program with the KickStart board from IAR. The UART keeps > generating the character time-out indicator interrupt. I have looked through all of the documentation from Philips and I cannot > find an explanation of what actually causes this interrupt. Does it mean that a stop bit was not found in nine bit times from the > start bit? Does it mean that the receive FIFO overran? Is this lack of a clear and concise explanation indicative of Philips > documentation? I am new to the LPC210x family, so please excuse my lack of understanding if the answer is obvious. I have worked > mostly with Motorola micros and there documentation seems more concise. > > > > Thanks, > > Bob Davis > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > |
