/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id:$ * * Copyright (C) 2006 Thom Johansen * * All files in this archive are subject to the GNU General Public License. * See the file COPYING in the source tree root for full license agreement. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "plugin.h" PLUGIN_HEADER PLUGIN_IRAM_DECLARE /* variable button definitions */ #if (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD) #define BTN_CANCEL BUTTON_OFF #elif (CONFIG_KEYPAD == IPOD_4G_PAD) || (CONFIG_KEYPAD == IPOD_3G_PAD) || \ (CONFIG_KEYPAD == IPOD_1G2G_PAD) #define BTN_CANCEL BUTTON_MENU #elif (CONFIG_KEYPAD == GIGABEAT_PAD) #define BTN_CANCEL BUTTON_POWER #elif (CONFIG_KEYPAD == SANSA_E200_PAD) || \ (CONFIG_KEYPAD == SANSA_C200_PAD) #define BTN_CANCEL BUTTON_POWER #elif CONFIG_KEYPAD == IAUDIO_X5M5_PAD #define BTN_CANCEL BUTTON_POWER #elif CONFIG_KEYPAD == IRIVER_H10_PAD #define BTN_CANCEL BUTTON_POWER #elif CONFIG_KEYPAD == MROBE500_PAD #define BTN_CANCEL BUTTON_POWER #endif #define BLOCK_SIZE 256 #define SAMPLE_RATE 44100 struct buffer { int signal_freq; short data[BLOCK_SIZE*2]; }; struct plugin_api* rb; struct buffer buffers[2] IDATA_ATTR; long samples_done; unsigned long long pos, delta; int start_freq = 20, stop_freq = 16000, duration = 15, sweep_type = 0; int cur_freq, cur_buf = 0, fill_buffer = 2; bool finished; /* 128 sixteen bit sine samples + guard point */ const short sinetab[] ICONST_ATTR = { 0, 1607, 3211, 4807, 6392, 7961, 9511, 11038, 12539, 14009, 15446, 16845, 18204, 19519, 20787, 22004, 23169, 24278, 25329, 26318, 27244, 28105, 28897, 29621, 30272, 30851, 31356, 31785, 32137, 32412, 32609,32727, 32767, 32727, 32609, 32412, 32137, 31785, 31356, 30851, 30272, 29621, 28897, 28105, 27244, 26318, 25329, 24278, 23169, 22004, 20787, 19519, 18204, 16845, 15446, 14009, 12539, 11038, 9511, 7961, 6392, 4807, 3211, 1607, 0, -1607, -3211, -4807, -6392, -7961, -9511, -11038, -12539, -14009, -15446, -16845, -18204, -19519, -20787, -22004, -23169, -24278, -25329, -26318, -27244, -28105, -28897, -29621, -30272, -30851, -31356, -31785, -32137, -32412, -32609, -32727, -32767, -32727, -32609, -32412, -32137, -31785, -31356, -30851, -30272, -29621, -28897, -28105, -27244, -26318, -25329, -24278, -23169, -22004, -20787, -19519, -18204, -16845, -15446, -14009, -12539, -11038, -9511, -7961, -6392, -4807, -3211, -1607, 0 }; /* Good quality sine calculated by linearly interpolating * a 128 sample sine table. First harmonic has amplitude of about -84 dB. * phase has range from 0 to 0xffffffff, representing 0 and * 2*pi respectively. * Return value is a signed value from LONG_MIN to LONG_MAX, representing * -1 and 1 respectively. */ static short fsin(uint32_t phase) ICODE_ATTR; static short fsin(uint32_t phase) { unsigned int pos = phase >> 25; unsigned short frac = (phase & 0x01ffffff) >> 9; short diff = sinetab[pos + 1] - sinetab[pos]; return sinetab[pos] + (frac*diff >> 16); } static void pcm_callback(unsigned char** start, size_t* size) { *start = (unsigned char *)buffers[cur_buf].data; *size = sizeof(buffers[cur_buf].data); cur_buf = (cur_buf + 1) & 1; fill_buffer = cur_buf + 1; } static void generate(int bufnum) ICODE_ATTR; static void generate(int bufnum) { int i, blockend; short sample; short *data = buffers[bufnum].data; if (BLOCK_SIZE < duration*SAMPLE_RATE - samples_done) { blockend = BLOCK_SIZE; } else { blockend = duration*SAMPLE_RATE - samples_done; finished = true; } for (i = 0; i < blockend*2; i += 2) { sample = fsin((uint32_t)(pos >> 16)*(samples_done + i/2)); data[i] = sample; data[i + 1] = sample; pos += delta; } samples_done += blockend; } static bool main_menu(void) { int selection, result; bool ret = false; MENUITEM_STRINGLIST(menu,"Signal generator", NULL, "Start frequency", "Stop frequency", "Duration", "Sweep type", "Generate signal", "Exit"); do { result = rb->do_menu(&menu, &selection); switch (result) { case 0: rb->set_int("Start frequency", "Hz", UNIT_HERTZ, &start_freq, NULL, 10, 10, 20000, NULL); break; case 1: rb->set_int("Stop frequency", "Hz", UNIT_HERTZ, &stop_freq, NULL, 200, 10, 20000, NULL); break; case 2: rb->set_int("Duration", "s", UNIT_SEC, &duration, NULL, 1, 1, 120, NULL); break; case 3: /* TODO implement sweep type */ break; case 4: ret = true; break; case 5: ret = false; break; } } while (result < 4); return ret; } enum plugin_status plugin_start(struct plugin_api *api, void *parameter) { (void)parameter; rb = api; PLUGIN_IRAM_INIT(api) rb->pcm_play_stop(); rb->pcm_set_frequency(SAMPLE_RATE); while (main_menu()) { finished = false; samples_done = 0; cur_freq = start_freq; if (sweep_type == 0) { //pos = 0xffff*start_freq/SAMPLE_RATE; //delta = 0xffff*(stop_freq - start_freq)/SAMPLE_RATE/(duration*SAMPLE_RATE); pos = 0xffffffffULL*((unsigned long long)start_freq << 16)/SAMPLE_RATE; delta = ((0xffffffffULL*((unsigned long long)(stop_freq - start_freq) << 16))/SAMPLE_RATE)/(duration*SAMPLE_RATE*2); } else if (sweep_type == 1) { /* Later */ } generate(0); rb->pcm_play_data(pcm_callback, NULL, 0); while (!finished) { if (rb->button_get(false) == BTN_CANCEL) finished = true; if (fill_buffer) { generate(fill_buffer - 1); fill_buffer = 0; } } rb->pcm_play_stop(); } return PLUGIN_OK; }