Hi all,
We have developed a LPC2378 board.One board is fully working with all possible
interfaces (SPI,UART,Ethernet etc) and i was using the JTAG emulator to load /
debug the software. I want to test the ISP feature , so i have taken up another
board.I have assembled the bare minimum components necessary for ISP alone.ISP
is not working.On tracing i found that the reset pin is floating.The reset pin
is pulled up thru a 10K resistor.So one end of this resistor shows 3.3v ,But the
other end(connected to the reset pin(pin 24)shows a level of around 600mv.So the
processor may not be running at all i guess.Unable to find out why.(A reset
switch is also connected to the reset pin for giving external reset,but i have
isolated this too.)
Any suggestions please? Thanks in advance,
Vinaya
LPC2378 reset pin problem
Started by ●February 16, 2010
Reply by ●February 16, 20102010-02-16
Hi
If I am correct you are using UART0 for ISP.
For ISP you have to keep Pin P2.10 LOW on power up . Durint power ON RESET if the controller get this pin LOW it initiate ISP handler, for normal code execution you have to keep HIGH (Pull up) this PIN. You have nothing to do with RESET pin of controler.
Thanks
-----Original Message-----
From: pintvin
To: l...
Sent: Tue, Feb 16, 2010 9:34 am
Subject: [lpc2000] LPC2378 reset pin problem
Hi all,
We have developed a LPC2378 board.One board is fully working with all possible interfaces (SPI,UART,Ethernet etc) and i was using the JTAG emulator to load / debug the software. I want to test the ISP feature , so i have taken up another board.I have assembled the bare minimum components necessary for ISP alone.ISP is not working.On tracing i found that the reset pin is floating.The reset pin is pulled up thru a 10K resistor.So one end of this resistor shows 3.3v ,But the other end(connected to the reset pin(pin 24)shows a level of around 600mv.So the processor may not be running at all i guess.Unable to find out why.(A reset switch is also connected to the reset pin for giving external reset,but i have isolated this too.)
Any suggestions please? Thanks in advance,
Vinaya
If I am correct you are using UART0 for ISP.
For ISP you have to keep Pin P2.10 LOW on power up . Durint power ON RESET if the controller get this pin LOW it initiate ISP handler, for normal code execution you have to keep HIGH (Pull up) this PIN. You have nothing to do with RESET pin of controler.
Thanks
-----Original Message-----
From: pintvin
To: l...
Sent: Tue, Feb 16, 2010 9:34 am
Subject: [lpc2000] LPC2378 reset pin problem
Hi all,
We have developed a LPC2378 board.One board is fully working with all possible interfaces (SPI,UART,Ethernet etc) and i was using the JTAG emulator to load / debug the software. I want to test the ISP feature , so i have taken up another board.I have assembled the bare minimum components necessary for ISP alone.ISP is not working.On tracing i found that the reset pin is floating.The reset pin is pulled up thru a 10K resistor.So one end of this resistor shows 3.3v ,But the other end(connected to the reset pin(pin 24)shows a level of around 600mv.So the processor may not be running at all i guess.Unable to find out why.(A reset switch is also connected to the reset pin for giving external reset,but i have isolated this too.)
Any suggestions please? Thanks in advance,
Vinaya
Reply by ●February 16, 20102010-02-16
Thanks for the reply.Yes you are right, i am using UART0 and iam taking care of
this P2.10 pin. But i am wondering if the microcon will enter into the ISP
handler at all since the reset pin is low?
rgds, Vinaya
--- In l..., manish.manware@... wrote:
> Hi
> If I am correct you are using UART0 for ISP.
> For ISP you have to keep Pin P2.10 LOW on power up . Durint power ON RESET if the controller get this pin LOW it initiate ISP handler, for normal code execution you have to keep HIGH (Pull up) this PIN. You have nothing to do with RESET pin of controler.
>
> Thanks
> -----Original Message-----
> From: pintvin
> To: l...
> Sent: Tue, Feb 16, 2010 9:34 am
> Subject: [lpc2000] LPC2378 reset pin problem
>
>
> Hi all,
> We have developed a LPC2378 board.One board is fully working with all possible interfaces (SPI,UART,Ethernet etc) and i was using the JTAG emulator to load / debug the software. I want to test the ISP feature , so i have taken up another board.I have assembled the bare minimum components necessary for ISP alone.ISP is not working.On tracing i found that the reset pin is floating.The reset pin is pulled up thru a 10K resistor.So one end of this resistor shows 3.3v ,But the other end(connected to the reset pin(pin 24)shows a level of around 600mv.So the processor may not be running at all i guess.Unable to find out why.(A reset switch is also connected to the reset pin for giving external reset,but i have isolated this too.)
> Any suggestions please? Thanks in advance,
> Vinaya
>
rgds, Vinaya
--- In l..., manish.manware@... wrote:
> Hi
> If I am correct you are using UART0 for ISP.
> For ISP you have to keep Pin P2.10 LOW on power up . Durint power ON RESET if the controller get this pin LOW it initiate ISP handler, for normal code execution you have to keep HIGH (Pull up) this PIN. You have nothing to do with RESET pin of controler.
>
> Thanks
> -----Original Message-----
> From: pintvin
> To: l...
> Sent: Tue, Feb 16, 2010 9:34 am
> Subject: [lpc2000] LPC2378 reset pin problem
>
>
> Hi all,
> We have developed a LPC2378 board.One board is fully working with all possible interfaces (SPI,UART,Ethernet etc) and i was using the JTAG emulator to load / debug the software. I want to test the ISP feature , so i have taken up another board.I have assembled the bare minimum components necessary for ISP alone.ISP is not working.On tracing i found that the reset pin is floating.The reset pin is pulled up thru a 10K resistor.So one end of this resistor shows 3.3v ,But the other end(connected to the reset pin(pin 24)shows a level of around 600mv.So the processor may not be running at all i guess.Unable to find out why.(A reset switch is also connected to the reset pin for giving external reset,but i have isolated this too.)
> Any suggestions please? Thanks in advance,
> Vinaya
>
