send_c30.c

dsp AD公司ADSP21的代码,里面有FFT FIR IIR EQULIZER G722_21F 等可以在项目中直接应用的代码.此代码的来源是ADI公司自己出版的书籍,此书在美国购得

/* SEND_C30.C - SENDOUT, GETINPUT : TMS320C30 CODE */

#include "c30.h"       /* GENERIC SUPPORT MACROS & STRUCTURES                */
#include "send_c30.h"  /* APPLICATION MACROS, GLOBALS, STRUCTURES, PROTOTYPES*/

/* sendout function to put a sample in the output FIFO */

void sendout(float x)
{
    if(!int_flag) {
      input  = (int *) calloc(BLOCK_SIZE, sizeof(int)); /* AIC INPUT         */
      output = (int *) calloc(BLOCK_SIZE, sizeof(int)); /* AIC OUTPUT        */
      int_flag = 1;
      init_aic();              /* INITIALIZE TLC32044 ANALOG INTERFACE CHIP */
    }
    if((++out_inx) == BLOCK_SIZE) out_inx = 0;
    while(out_inx == index);
    output[out_inx] = (int)x;
}

/* getinput function to get a sample from the input FIFO */

float getinput()
{
    if(!int_flag) {
      input  = (int *) calloc(BLOCK_SIZE, sizeof(int)); /* AIC INPUT         */
      output = (int *) calloc(BLOCK_SIZE, sizeof(int)); /* AIC OUTPUT        */
      int_flag = 1;
      init_aic();              /* INITIALIZE TLC32044 ANALOG INTERFACE CHIP */
    }
    if((++in_inx) == BLOCK_SIZE) in_inx = 0;
    while(in_inx == index);
    return((float)input[in_inx]);
}

/* empty the output buffer */

void flush()
{
    while(out_inx != index);
    asm(" XOR  2000h,ST"); /* RESET GLOBAL INTERRUPT ENABLE BIT */
    int_flag = 0;
}

/* C_INT05()                                                                  */
/*        SERIAL PORT 0 TRANSMIT INTERRUPT SERVICE ROUTINE                    */
/*        1. IF SECONDARY TRANSMISSION SEND AIC COMMAND WORD                  */
/*        2. OTHERWISE IF COMMAND SEND REQUESTED SETUP FOR SECONDARY          */
/*           TRANSMISSION ON NEXT INTERRUPT                                   */
/*        3. OTHERWISE WRITE OUT OUTPUT DATA AND READ IN INPUT DATA           */
void c_int05(void)
{
    if (send_command)
    {
        if (secondary_transmit)
        {
          serial_port[0][X_DATA] = aic_secondary;
          secondary_transmit     = OFF;
          send_command           = OFF;
        }
        else
        {
          serial_port[0][X_DATA] = 3;
          secondary_transmit     = ON;
        }
    }
    else
    {
        serial_port[0][X_DATA] = output[index] << 2;
        input[index] = serial_port[0][R_DATA] << 16 >> 18;

        if ((++index) == BLOCK_SIZE) index = 0;
    }
}