Hello. I'm using the DSK6555 with TMS 1,2GHz.
I have a problem with an understanding functions using the timer and time characteristics
My test dsp applications using the dsp/bios configuration bellow
utils.loadPlatform("ti.platforms.dsk6455");
/* The following DSP/BIOS Features are enabled. */
bios.enableMemoryHeaps(prog);
bios.enableRealTimeAnalysis(prog);
bios.enableRtdx(prog);
bios.enableTskManager(prog);
bios.GBL.CLKOUT = 1200.0000;
bios.MEM.instance("IRAM").createHeap = 1;
bios.MEM.instance("DDR2").createHeap = 1;
bios.MEM.BIOSOBJSEG = prog.get("IRAM");
bios.MEM.MALLOCSEG = prog.get("IRAM");
bios.TSK.create("MyTask");
bios.TSK.instance("MyTask").order = 2;
bios.TSK.instance("MyTask").fxn = prog.extern("myTask");
// !GRAPHICAL_CONFIG_TOOL_SCRIPT_INSERT_POINT!
prog.gen();
Values of some time functions:
CLK_countspms(); //1200000
CLK_getprd();// 1199994
this pair corresponds each other, on one low timer tick i have about 1200000 high timer ticks
CLK_cpuCyclesPerHtime();// 1.0
CLK_cpuCyclesPerLtime(); //199999.000000
This pair doesn't corresponds each other. See upper.
GBL_getClkIn(); //199999.00000
GBL_getFrequency();//199999.000035
I don't understand this values
TSK_sleep(100) - sleeps by 100ms and the high resolution timer value increases by 120 000 000, the low resolution timer value increases by 100
Function descriptions:
1. CLK_countspms(); //High resolution timer ticks in the ms. It's works properly (but tonight only, yesterday TSK_sleep() waited much longer time)
2. CLK_getprd(); //High resolution timer ticks in the low resolution timer ticks. (Example calulating abs time is right)
timeAbs = (CLK_getltime() * CLK_getprd()) / CLK_countspms();
3. CLK_cpuCyclesPerHtime(); Use doc example
time1 = CLK_gethtime();
... processing ...
time2 = CLK_gethtime();
CPUcycles = (time2 - time1) * CLK_cpuCyclesPerHtime(); // = 120 000 000 * 1
/* calculate absolute time in milliseconds */
TimeAbsolute = CPUCycles / GBL_getFrequency(); //120 000 000 / 200 000 = 600 ms (real value is 100 ms) ????
4. CLK_cpuCyclesPerLtime(); //see CLK_cpuCyclesPerHtime(). It also works wrong.
Thanks.
