Forum Post: BIOS_getCpuFreq() on C6678

Hi,

I have a problem with the SYSBIOS function BIOS_getCpuFreq() as the frequency value it returns is incorrect in my software.

I work with the C6678 DSP. In my software I use the BIOS_getCpuFreq() function call which always returns 1000MHz.

BIOS_getCpuFreq (&cpuFreq); 

returns

cpuFreq.hi = 0

cpuFreq.lo = 1000000000

I have ran the DSP CPU core at 3 different frequencies 800MHz, 1000MHz and 1200MHz by modifying the PLL settings as in Table 2-24 of the TMS320C6678 Data Manual (http://www.ti.com/lit/ds/sprs691d/sprs691d.pdf). By probing the DSP SYSCLKOUT with an oscilloscope, I have found the CPU frequency indeed gets set to the correct frequency.

Could you let me know what settings I should modify in SYS BIOS so that BIOS_getCpuFreq () will return the correct frequency?

My SYS BIOS version is 6.33.6.50 and the XDC tools version is 3.23.4.60.

Thanks.

Luke