Hi,
Please checkout one way to do it. A function can be written for the purpose.
NOTE: Using this function requires the filter component to be set up with the same
type of filter (biquad or FIR) and number of taps/order as the coefficients being
loaded here.
*/
void Filter_LoadCoefficients(uint8 *pFiltCoeffs, uint16 wSize, uint16 wOffset)
{
/* This is the externally defined null array we will
use to clear out the sample data in RAM */
extern const uint8 CYCODE Filter_data_a[];
/* Power on DFB before initializing the RAMs */
Filter_PM_ACT_CFG_REG |= Filter_PM_ACT_MSK;
/* Turn off Run Bit */
Filter_CR_REG &= ~Filter_RUN_MASK;
/* Enable the DFB RAMS */
Filter_RAM_EN_REG = Filter_RAM_DIR_BUS;
/* Put DFB RAM on the bus */
Filter_RAM_DIR_REG = Filter_RAM_DIR_BUS;
/* DAta RAMs */
/* Clear out the RAM which contains the sample values
from the previously operating filter */
memcpy(Filter_DA_RAM,
Filter_data_a, Filter_DA_RAM_SIZE);
/* This one copies wSize bytes of filter coefficients at the specified offset in the data B RAM */
memcpy(Filter_DB_RAM+wOffset,
pFiltCoeffs, wSize);
/* Take DFB RAM off the bus */
Filter_RAM_DIR_REG = Filter_RAM_DIR_DFB;
/* Set up interrupt and DMA events */
// Filter_SetInterruptMode(Filter_INIT_INTERRUPT_MODE);
// Filter_SetDMAMode(Filter_INIT_DMA_MODE);
/* Clear any pending interrupts */
/* Bits [2..0] of this register are readonly. */
Filter_SR_REG = 0xf8;
}
Best Regards,
Vasanth
