After going to CAN sleep mode, I'm unable to Wake_up by using, wakeup register.
it is not clear what you are talking about.
"Wake up by register:....what does it mean?..
a bit - WUPEWake-Up Enable — This configuration bit allows the MSCAN to restart from sleep mode or from power downmode (entered from sleep) when traffic on CAN is detected (see Section 220.127.116.11, “MSCAN Sleep Mode”). Thisbit must be configured before sleep mode entry for the selected function to take effect.0 Wake-up disabled — The MSCAN ignores traffic on CAN1 Wake-up enabled — The MSCAN is able to restart
Note: 3. The CPU has to make sure that the WUPE register and the WUPIE wake-up interrupt enable register (see Section 18.104.22.168, “MSCAN Receiver Interrupt Enable Register (CANRIER)) is enabled, if the recovery mechanism from stop or wait is required.
a bit - WUPMWake-Up Mode — If WUPE in CANCTL0 is enabled, this bit defines whether the integrated low-pass filter isapplied to protect the MSCAN from spurious wake-up (see Section 22.214.171.124, “MSCAN Sleep Mode”).0 MSCAN wakes up on any dominant level on the CAN bus1 MSCAN wakes up only in case of a dominant pulse on the CAN bus that has a length of Twup
a bit - WUPIFWake-Up Interrupt Flag — If the MSCAN detects CAN bus activity while in sleep mode (see Section 126.96.36.199,“MSCAN Sleep Mode,”) and WUPE = 1 in CANTCTL0 (see Section 188.8.131.52, “MSCAN Control Register 0(CANCTL0)”), the module will set WUPIF. If not masked, a wake-up interrupt is pending while this flag is set.0 No wake-up activity observed while in sleep mode1 MSCAN detected activity on the CAN bus and requested wake-up
So, registers are responsible for setup only. For wake up the traffic on CAN bus with and proper wake up setup are responsible.
I have the same issue.
CAN0RIER_WUPIE=1; // 0x7d ==> 0xfd Modify OK CAN0CTL1_WUPM=1; // 0x80 ==> 0x84 Modify Failure CAN0RFLG_WUPIF=1; // 0x08 ==> 0x88 Modify Failure CAN0CTL0_WUPE=1; // 0x94 ==> 0x14 Already =1 CAN1_SetSleepRequest();// Cpu_SetWaitMode(); Cpu_SetStopMode();
CAN0RIER_WUPIE=1; // 0x7d ==> 0xfd Modify OK CAN0CTL1_WUPM=1; // 0x80 ==> 0x84 Modify Failure CAN0RFLG_WUPIF=1; // 0x08 ==> 0x88 Modify Failure CAN0CTL0_WUPE=1; // 0x94 ==> 0x14 Already =1
CAN1_SetSleepRequest();// Cpu_SetWaitMode(); Cpu_SetStopMode();
The following registers modify failure.
Do you have any recommend?
WUPM bit is write protected while INITAK == 0.
CAN0RLG has more than one flag clearable writing one to it. So the following your code line is wrong and will clear as well CSCIF, OVRIF and RXF and will lead to data loss if done while RXF==1
Please use correct flag clearing sequence:
Retrieving data ...