TMS320F280039C: always can error at import sample of Mcan or can

Tool/software:

i always send out can error at can_tx or Mcan_tx while import sample at the board,

but i still don't know what wrong.

1) import  cab_ex5_transmit_receive, at C2000Ware_5_04_00_00\driverlib\f28003x\examples\can 

2)modify the jtag/ SWD/ cJTAG mode to cJTAG 2pin  at TMS320F280039C.ccxml at targetconfigs.

3) according to the GPIO, DEVICE_GPIO_CFG_CANTXA. is GPIO-32.

i measure the signal of GPIO-32. and bitrate as 500,000.

is show can_error.

at another Mcan example.

i got the same situtation.

1)import mcan_ex9_transmit  at C2000Ware_5_04_00_00\driverlib\f28003x\examples\mcan

2)modify the jtag/ SWD/ cJTAG mode to cJTAG 2pin  at TMS320F280039C.ccxml at targetconfigs.

3)according to the DEVICE_GPIO_CFG_MCANTXA as GPIO31,

4)i connect to the GPIO-31 and measure the signal.

show the same signal at can, which is can_error

5) and according to the  excel and source code,

bitTimes.nomRatePrescalar = 0x3U; // Nominal Baud Rate Pre-scaler
bitTimes.nomTimeSeg1 = 0x9U; // Nominal Time segment before SP
bitTimes.nomTimeSeg2 = 0x8U; // Nominal Time segment after SP
bitTimes.nomSynchJumpWidth = 0x8U; // Nominal SJW
bitTimes.dataRatePrescalar = 0x1U; // Data Baud Rate Pre-scaler
bitTimes.dataTimeSeg1 = 0x9U; // Data Time segment before SP
bitTimes.dataTimeSeg2 = 0x8U; // Data Time segment after SP
bitTimes.dataSynchJumpWidth = 0x8U; // Data SJW

it shows the error speed, 33.33MHz,

what speed actually it is ?

and how can i send out can / mcan data correctly ?