Tool/software:
Hi TI support team,
Previously I have tried to run single_chip_servo demo in MOTOR_CONTROL_SDK with tamagawa encoder.
At first I couldn't get proper value of SDDF in "gSddfChSamps."
However I have modified "mclk_iep_sync.c", I could acquire valid SDDF values.
Now I'm trying to run single_chip_servo demo on R5FSS1-1 instead of R5FSS0-0 without tamagawa encoder or Endat.
But I can get SDDF value less than 268,435,456 = 2^28 ( for example 268,435,424 or 268,435,104)
or more than 0 (for example 8 or 120)
My SDDF setting is below
/* Test Sdfm parameters */
SdfmPrms gTestSdfmPrms = {
200000000, /*Value of IEP clock*/
20000000, /*Value of SD clock (It should be exact equal to sd clock value)*/
0, /*enable double update*/
10, /*first sample trigger time*/
0, /*second sample trigger time*/
APP_EPWM_OUTPUT_FREQ, /*PWM output frequency 50kHz*/
{{3500, 1000}, /*threshold parameters(High, low )*/
{3500, 1000},
{3500, 1000}},
{{0,0}, /*clock sourse & clock inversion for all channels*/
{0,0},
{0,0}},
15, /*Over current osr: The effect count is OSR + 1*/
64, /*Normal current osr */
0, /*comparator enable*/
(uint32_t)&gSddfChSamps /*Output samples base address*/
};
I know SDDF value is normalized by substracting SDDF_HALF_SCALE (=2^17)
Following are my questions.
- How can I get valid value of SDDF?
- Where can I set number of bits of SDDF values?
Best regards,
Dai TANAKA
I know SDDF value is normalized by substracting SDDF_HALF_SCALE (=2^17)
Following are my questions.
- How can I get valid value of SDDF?
- Where can I set number of bits of SDDF values?
Best regards,
Dai TANAKA