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I need a 5ms delay before sending a signal to a sonic transceiver. When I use codewarrior to start the program i get my 5ms delay (I use a for loop for the delay). When I switch to Run mode and start the program, the delay was much longer (30ms i think?). Why does execution apear to be faster while running in boot mode? Also I posted a question earlier that I would still like help on (post 6029): Using C with codewarrior, i use this statement: time1 = TCNT; For debug prurposes how can i check the value of the time1 varible in Codewarrior?? Thank you for any help Steve |
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9s12c32 Boot mode VS. Run mode
Started by ●March 6, 2004
Reply by ●March 6, 20042004-03-06
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>When I switch to Run mode and start > the program, the delay was much longer (30ms i think?). Why does > execution apear to be faster while running in boot mode? In run mode the PLL is not engage, you add that to your code. In boot mode the PLL is engaged. |
Reply by ●March 7, 20042004-03-07
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Hello Steven Maybe I am misinterpreting your question, but normally you would look at the variable in the data window of the "True Time Simulator" (or whatever debugging target you are using) after setting a breakpoint. You can either set the breakpoint in the code display of the debugger or code it into your program by defining an inline asm call: #define trace asm( bgnd;) Then you insert the function call trace(); after your assignment to trigger the breakpoint. Good Luck! Robert On Mar 6, 2004, at 10:27 PM, Steven Bak wrote: > > I need a 5ms delay before sending a signal to a sonic transceiver. > When I use codewarrior to start the program i get my 5ms delay (I > use a for loop for the delay). When I switch to Run mode and start > the program, the delay was much longer (30ms i think?). Why does > execution apear to be faster while running in boot mode? > > Also I posted a question earlier that I would still like help on > (post 6029): Using C with codewarrior, i use this statement: > time1 = TCNT; > For debug prurposes how can i check the value of the time1 varible > in Codewarrior?? > > Thank you for any help > Steve > > --------------------To learn more > about Motorola Microcontrollers, please visit > http://www.motorola.com/mcu > o learn more about Motorola Microcontrollers, please visit > http://www.motorola.com/mcu > > Yahoo! Groups Links |
Reply by ●March 7, 20042004-03-07
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Steve, When you start using any BDM debugger, you already have the MC9S123C32 reset with the clock running so that you can issue the BDM command to start the program. When you do a hardware reset you get a hardware delay to allow the oscillator to start and become stable. See the section 5.2 - "Description of Reset Operation" in the in the Motorola "CRG Block User Guide V04.05" documentation. Steve Russell Nohau Emulators At 01:27 PM 3/6/2004, you wrote: >I need a 5ms delay before sending a signal to a sonic transceiver. >When I use codewarrior to start the program i get my 5ms delay (I >use a for loop for the delay). When I switch to Run mode and start >the program, the delay was much longer (30ms i think?). Why does >execution apear to be faster while running in boot mode? > >Also I posted a question earlier that I would still like help on >(post 6029): Using C with codewarrior, i use this statement: >time1 = TCNT; >For debug prurposes how can i check the value of the time1 varible >in Codewarrior?? > >Thank you for any help >Steve ************************************************************************* Steve Russell mailto: Senior Software Design Engineer http://www.nohau.com Nohau Corporation phone: (408)866-1820 ext. 1873 51 East Campbell Avenue fax: (408)378-7869 Campbell, CA 95008 ************************************************************************* |
