/* * Copyright (c) 2012, 2013, Joel Bodenmann aka Tectu * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of the nor the * names of its contributors may be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** * --------------------------- Our Custom GWIN Oscilloscope --------------- * * This GWIN superset implements a simple audio oscilloscope using the GADC high speed device. */ #include "gfx.h" #include "gwinosc.h" /* Include internal GWIN routines so we can build our own superset class */ #include "gwin/internal.h" /* Our GWIN identifier */ #define GW_SCOPE (GW_FIRST_USER_WINDOW+0) /* The size of our dynamically allocated audio buffer */ #define AUDIOBUFSZ 64*2 /* How many flat-line sample before we trigger */ #define FLATLINE_SAMPLES 8 GHandle gwinCreateScope(GScopeObject *gs, coord_t x, coord_t y, coord_t cx, coord_t cy, uint32_t physdev, uint32_t frequency) { /* Initialise the base class GWIN */ if (!(gs = (GScopeObject *)_gwinInit((GWindowObject *)gs, x, y, cx, cy, sizeof(GScopeObject)))) return 0; /* Initialise the scope object members and allocate memory for buffers */ gs->gwin.type = GW_SCOPE; gfxSemInit(&gs->bsem, 0, 1); gs->nextx = 0; if (!(gs->lastscopetrace = (coord_t *)gfxAlloc(gs->gwin.width * sizeof(coord_t)))) return 0; if (!(gs->audiobuf = (adcsample_t *)gfxAlloc(AUDIOBUFSZ * sizeof(adcsample_t)))) return 0; #if TRIGGER_METHOD == TRIGGER_POSITIVERAMP gs->lasty = gs->gwin.height/2; #elif TRIGGER_METHOD == TRIGGER_MINVALUE gs->lasty = gs->gwin.height/2; gs->scopemin = 0; #endif /* Start the GADC high speed converter */ gadcHighSpeedInit(physdev, frequency, gs->audiobuf, AUDIOBUFSZ, AUDIOBUFSZ/2); gadcHighSpeedSetBSem(&gs->bsem, &gs->myEvent); gadcHighSpeedStart(); return (GHandle)gs; } void gwinWaitForScopeTrace(GHandle gh) { #define gs ((GScopeObject *)(gh)) int i; coord_t x, y; coord_t yoffset; adcsample_t *pa; coord_t *pc; #if TRIGGER_METHOD == TRIGGER_POSITIVERAMP bool_t rdytrigger; int flsamples; #elif TRIGGER_METHOD == TRIGGER_MINVALUE bool_t rdytrigger; int flsamples; coord_t scopemin; #endif /* Wait for a set of audio conversions */ gfxSemWait(&gs->bsem, TIME_INFINITE); /* Ensure we are drawing in the right area */ #if GDISP_NEED_CLIP gdispSetClip(gh->x, gh->y, gh->width, gh->height); #endif yoffset = gh->height/2 + (1<nextx; pc = gs->lastscopetrace+x; pa = gs->myEvent.buffer; #if TRIGGER_METHOD == TRIGGER_POSITIVERAMP rdytrigger = FALSE; flsamples = 0; #elif TRIGGER_METHOD == TRIGGER_MINVALUE rdytrigger = FALSE; flsamples = 0; scopemin = 0; #endif for(i = gs->myEvent.count; i; i--) { /* Calculate the new scope value - re-scale using simple shifts for efficiency, re-center and y-invert */ #if GADC_BITS_PER_SAMPLE > SCOPE_Y_BITS y = yoffset - (*pa++ >> (GADC_BITS_PER_SAMPLE - SCOPE_Y_BITS)); #else y = yoffset - (*pa++ << (SCOPE_Y_BITS - GADC_BITS_PER_SAMPLE)); #endif #if TRIGGER_METHOD == TRIGGER_MINVALUE /* Calculate the scopemin ready for the next trace */ if (y > scopemin) scopemin = y; #endif /* Have we reached the end of a scope trace? */ if (x >= gh->width) { #if TRIGGER_METHOD == TRIGGER_POSITIVERAMP || TRIGGER_METHOD == TRIGGER_MINVALUE /* Handle triggering - we trigger on the next sample minimum (y value maximum) or a flat-line */ #if TRIGGER_METHOD == TRIGGER_MINVALUE /* Arm when we reach the sample minimum (y value maximum) of the previous trace */ if (!rdytrigger && y >= gs->scopemin) rdytrigger = TRUE; #endif if (y == gs->lasty) { /* Trigger if we get too many flat-line samples regardless of the armed state */ if (++flsamples < FLATLINE_SAMPLES) continue; flsamples = 0; } else if (y > gs->lasty) { gs->lasty = y; flsamples = 0; #if TRIGGER_METHOD == TRIGGER_POSITIVERAMP /* Arm the trigger when samples fall (y increases) ie. negative slope */ rdytrigger = TRUE; #endif continue; } else { /* If the trigger is armed, Trigger when samples increases (y decreases) ie. positive slope */ gs->lasty = y; flsamples = 0; if (!rdytrigger) continue; } /* Ready for a the next trigger cycle */ rdytrigger = FALSE; #endif /* Prepare for a scope trace */ x = 0; pc = gs->lastscopetrace; } /* Clear the old scope pixel and then draw the new scope value */ gdispDrawPixel(gh->x+x, gh->y+pc[0], gh->bgcolor); gdispDrawPixel(gh->x+x, gh->y+y, gh->color); /* Save the value */ *pc++ = y; x++; #if TRIGGER_METHOD == TRIGGER_POSITIVERAMP || TRIGGER_METHOD == TRIGGER_MINVALUE gs->lasty = y; #endif } gs->nextx = x; #if TRIGGER_METHOD == TRIGGER_MINVALUE gs->scopemin = scopemin; #endif #undef gs } 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184