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Discussion Groups | 68HC12 | Initialization mode of the MSCAN module for MC9SDJ128B
Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).
Initialization mode of the MSCAN module for MC9SDJ128B - ecm_joe - Jun 10 18:30:00 2004
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I've run into an interesting problem with trying to get the MSCAN module out of initialization mode from startup. In my debugger environment (Cosmic tools and debugger with BDM-Multilink) I can bring the MSCAN module out of initialization mode after reset just fine, but if I try that same piece of code after completely removing and then reconnecting the power, it doesn't work. It will not bring the MSCAN module out of initialization mode. I even wrote a loop that check's the INITAK bit to see if it's set then I clear INITRQ and loop again. It won't exit out of this loop. I've scoured the Motorola site, but having found anything that might help me. Let me know if anybody has any insight. Thanks Joe |
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Initialization mode of the MSCAN module for MC9SDJ128B - ecm_joe - Jun 10 18:33:00 2004
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I've run into an interesting problem with trying to get the MSCAN module out of initialization mode from startup. In my debugger environment (Cosmic tools and debugger with BDM-Multilink) I can bring the MSCAN module out of initialization mode after reset just fine, but if I try that same piece of code after completely removing and then reconnecting the power, it doesn't work. It will not bring the MSCAN module out of initialization mode. I even wrote a loop that check's the INITAK bit to see if it's set then I clear INITRQ and loop again. It won't exit out of this loop. I've scoured the Motorola site, but having found anything that might help me. Let me know if anybody has any insight. Thanks Joe |
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Re: Initialization mode of the MSCAN module for MC9SDJ128B - ecm_joe - Jun 10 20:38:00 2004
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Sorry to bother you all, but I figured it out. I was being a moron. I was bringing the MSCAN out of listen mode and in the following statement enabling the MSCAN module. Since I was writing to the CANCTL1 register to bring it out of listen mode before I was writing to enable the CAN module, I was effectively disabling the CAN module until the next restart. It worked in Debug mode because the CANE bit can be set multiple times in debug mode, but only once in normal mode. Joe --- In , "ecm_joe" <jconnors@s...> wrote: > I've run into an interesting problem with trying to get the MSCAN > module out of initialization mode from startup. In my debugger > environment (Cosmic tools and debugger with BDM-Multilink) I can > bring the MSCAN module out of initialization mode after reset just > fine, but if I try that same piece of code after completely removing > and then reconnecting the power, it doesn't work. It will not bring > the MSCAN module out of initialization mode. I even wrote a loop > that check's the INITAK bit to see if it's set then I clear INITRQ > and loop again. It won't exit out of this loop. > > I've scoured the Motorola site, but having found anything that might > help me. Let me know if anybody has any insight. > > Thanks > > Joe |
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