测试6678代码运行的时间

Haifei Wu

您好！想测试一段代码在6678上运行的时间。通过_itoll(TSCH, TSCL)读取寄存器里面的数值，进行前后比较。通过这种方法得到的寄存器值的变化为4336995703，而6678的CPU主频为1GHz，这种方法得到的代码运行时间为4.34秒左右，但是我通过秒表测量得到的时间却是9.5秒。想问一下为什么会有这么大的差异？谢谢！

12 年多前

0 Wei 12 年多前

TI__Intellectual 1470 points

如果你确定你的秒表和测试方法没有问题 :)，那有可能是6678的主频没有跑到1GHz，你可以检查一下相关PLL的配置。

0 Haifei Wu 12 年多前回复 Wei

Prodigy 210 points

您好！我在给板子上电连接之后，使用CCS中的GEL文件初始化，以下是所显示的。PLL的配置是不是就是DSP @ 1000.0 MHz.种显示的？

C66xx_0: GEL Output: Global Default Setup...
C66xx_0: GEL Output: C6678L GEL file Ver is 1.4
C66xx_0: GEL Output: Setup Cache...
C66xx_0: GEL Output: L1P = 32K
C66xx_0: GEL Output: L1D = 32K
C66xx_0: GEL Output: L2 = ALL SRAM
C66xx_0: GEL Output: Setup Cache... Done.
C66xx_0: GEL Output: PLL1 Setup...
C66xx_0: GEL Output: PLL1 Setup for DSP @ 1000.0 MHz.
C66xx_0: GEL Output: SYSCLK2 = 333.3333 MHz, SYSCLK5 = 200.0 MHz.
C66xx_0: GEL Output: SYSCLK8 = 15.625 MHz.
C66xx_0: GEL Output: PLL1 Setup... Done.
C66xx_0: GEL Output: Power on all PSC modules and DSP domains...
C66xx_0: GEL Output: Set_PSC_State... Timeout Error #03 pd=2, md=9!
C66xx_0: GEL Output: Power on all PSC modules and DSP domains... Done.
C66xx_0: GEL Output: PA PLL is using SYSCLK/ALTCORECLK as the input
C66xx_0: GEL Output: PA PLL is in PLL mode
C66xx_0: GEL Output: PA PLL fixed output divider = 2
C66xx_0: GEL Output: PA PLL programmable multiplier = 21
C66xx_0: GEL Output: PA PLL programmable divider = 1
C66xx_0: GEL Output: the output frequency should be 10 times the PA reference clock
C66xx_0: GEL Output: configSGMIISerdes Setup... Begin
C66xx_0: GEL Output:
SGMII SERDES has been configured.
C66xx_0: GEL Output: Enabling EDC ...
C66xx_0: GEL Output: L1P error detection logic is enabled.
C66xx_0: GEL Output: L2 error detection/correction logic is enabled.
C66xx_0: GEL Output: MSMC error detection/correction logic is enabled.
C66xx_0: GEL Output: Enabling EDC ...Done
C66xx_0: GEL Output: Configuring CPSW ...
C66xx_0: GEL Output: Configuring CPSW ...Done
C66xx_0: GEL Output: DDR begin (1333 auto)
C66xx_0: GEL Output: XMC Setup ... Done
C66xx_0: GEL Output:
DDR3 initialization is complete.
C66xx_0: GEL Output: DDR done
C66xx_0: GEL Output: Global Default Setup... Done.