00001 /*This file is prepared for Doxygen automatic documentation generation.*/ 00015 /* Copyright (c) 2009 Atmel Corporation. All rights reserved. 00016 * 00017 * Redistribution and use in source and binary forms, with or without 00018 * modification, are permitted provided that the following conditions are met: 00019 * 00020 * 1. Redistributions of source code must retain the above copyright notice, this 00021 * list of conditions and the following disclaimer. 00022 * 00023 * 2. Redistributions in binary form must reproduce the above copyright notice, 00024 * this list of conditions and the following disclaimer in the documentation 00025 * and/or other materials provided with the distribution. 00026 * 00027 * 3. The name of Atmel may not be used to endorse or promote products derived 00028 * from this software without specific prior written permission. 00029 * 00030 * 4. This software may only be redistributed and used in connection with an Atmel 00031 * AVR product. 00032 * 00033 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED 00034 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00035 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE 00036 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR 00037 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 00038 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00039 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 00040 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00041 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00042 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE 00043 * 00044 */ 00045 00046 #include "dsp.h" 00047 00048 #ifndef MIN 00049 # define MIN(x, y) (((x) < (y))?(x):(y)) 00050 #endif 00051 00052 #if defined(FORCE_ALL_GENERICS) || \ 00053 defined(FORCE_GENERIC_GEN16_DCOMB) || \ 00054 !defined(TARGET_SPECIFIC_GEN16_DCOMB) 00055 00056 void dsp16_gen_dcomb(dsp16_t *vect1, int size, int f, int fs, dsp16_t delay) 00057 { 00058 int i; 00059 int t_inc, t_low, cp; 00060 int t_delay; 00061 00062 // Number of sample per period 00063 t_inc = fs / f; 00064 // Number of sample for the delay 00065 t_delay = (((S32) delay) * ((S32) t_inc)) >> DSP16_QB; 00066 00067 // Number of sample per low signal 00068 t_inc--; 00069 00070 i = 0; 00071 t_low = t_delay; 00072 00073 // Main loop 00074 while(i < size) 00075 { 00076 // Low part 00077 cp = MIN(t_low, size); 00078 for(; i<cp; i++) 00079 vect1[i] = DSP16_Q(0.); 00080 // High part 00081 if (i < size) 00082 vect1[i++] = DSP16_Q(1.); 00083 00084 t_low = t_inc + i; 00085 } 00086 } 00087 00088 #endif 00089 00090 #if defined(FORCE_ALL_GENERICS) || \ 00091 defined(FORCE_GENERIC_GEN32_DCOMB) || \ 00092 !defined(TARGET_SPECIFIC_GEN32_DCOMB) 00093 00094 void dsp32_gen_dcomb(dsp32_t *vect1, int size, int f, int fs, dsp32_t delay) 00095 { 00096 int i; 00097 int t_inc, t_low, cp; 00098 int t_delay; 00099 00100 // Number of sample per period 00101 t_inc = fs / f; 00102 // Number of sample for the delay 00103 t_delay = (((S64) delay) * ((S64) t_inc)) >> DSP32_QB; 00104 00105 // Number of sample per low signal 00106 t_inc--; 00107 00108 i = 0; 00109 t_low = t_delay; 00110 00111 // Main loop 00112 while(i < size) 00113 { 00114 // Low part 00115 cp = MIN(t_low, size); 00116 for(; i<cp; i++) 00117 vect1[i] = DSP32_Q(0.); 00118 // High part 00119 if (i < size) 00120 vect1[i++] = DSP32_Q(1.); 00121 00122 t_low = t_inc + i; 00123 } 00124 } 00125 00126 #endif