aboutsummaryrefslogtreecommitdiffstats
path: root/src/gadc/gadc.c
blob: d307519bc6362c229e2ebcced1df36ebca198efa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
/*
 * This file is subject to the terms of the GFX License. If a copy of
 * the license was not distributed with this file, you can obtain one at:
 *
 *              http://ugfx.org/license.html
 */

/**
 * @file    src/gadc/gadc.c
 * @brief   GADC sub-system code.
 *
 * @addtogroup GADC
 * @{
 */
#include "gfx.h"

#if GFX_USE_GADC

/* Include the driver defines */
#include "src/gadc/driver.h"

#if GADC_MAX_HIGH_SPEED_SAMPLERATE > GADC_MAX_SAMPLE_FREQUENCY/2
	#error "GADC: GADC_MAX_HIGH_SPEED_SAMPLERATE has been set too high. It must be less than half the maximum CPU rate"
#endif

#define GADC_HSADC_GTIMER		0x8000
#define GADC_ADC_RUNNING		0x4000
#define GADC_HSADC_CONVERTION	0x2000

typedef struct NonTimerData_t {
	gfxQueueGSyncItem		next;
	GADCCallbackFunction	callback;
	union {
		void				*param;
		gfxSem				sigdone;
	};
	GadcNonTimerJob			job;
	} NonTimerData;

static volatile uint16_t		hsFlags;
static size_t					hsBytesPerConv;
static GadcTimerJob				hsJob;
static GDataBuffer				*hsData;
static gfxQueueGSync			hsListDone;
static GADCISRCallbackFunction	hsISRcallback;
#if GFX_USE_GEVENT
	static GTimer				hsGTimer;
#endif

static GTimer					lsGTimer;
static gfxQueueGSync			lsListToDo;
static gfxQueueGSync			lsListDone;
static NonTimerData				*lsData;

void gadcGotDataI(size_t n) {
	if ((hsFlags & GADC_HSADC_CONVERTION)) {

		// A set of timer conversions is done - add them
		hsJob.done += n;

		// Are we finished yet? (or driver signalled complete now)
		if (n && hsJob.done < hsJob.todo)
			return;

		// Clear event flags we might set
		hsFlags &= ~(GADC_HSADC_GOTBUFFER|GADC_HSADC_STALL);

		// Is there any data in it
		if (!hsJob.done) {

			// Oops - no data in this buffer. Just return it to the free-list
			gfxBufferReleaseI(hsData);
			goto starttimerjob;					// Restart the timer job
		}

		// Save the buffer on the hsListDone list
		hsData->len = hsJob.done * hsBytesPerConv;
		gfxQueueGSyncPutI(&hsListDone, (gfxQueueGSyncItem *)hsData);
		hsFlags |= GADC_HSADC_GOTBUFFER;

		/* Signal a buffer completion */
		if (hsISRcallback)
			hsISRcallback();
		#if GFX_USE_GEVENT
			if (hsFlags & GADC_HSADC_GTIMER)
				gtimerJabI(&hsGTimer);
		#endif

		// Stop if we have been told to
		if (!(hsFlags & GADC_HSADC_RUNNING)) {
			gadc_lld_stop_timerI();

		// Get the next free buffer
		} else if (!(hsData = gfxBufferGetI())) {

			// Oops - no free buffers. Stall
			hsFlags &= ~GADC_HSADC_RUNNING;
			hsFlags |= GADC_HSADC_STALL;
			gadc_lld_stop_timerI();

		// Prepare the next job
		} else {

			// Return this new job
			#if GFX_USE_OS_CHIBIOS
				// ChibiOS api bug - samples must be even
				hsJob.todo = (hsData->size / hsBytesPerConv) & ~1;
			#else
				hsJob.todo = hsData->size / hsBytesPerConv;
			#endif
			hsJob.done = 0;
			hsJob.buffer = (adcsample_t *)(hsData+1);
		}

		// Start a job preferring a non-timer job
		if ((lsData = (NonTimerData *)gfxQueueGSyncGetI(&lsListToDo))) {
			hsFlags &= ~GADC_HSADC_CONVERTION;
			gadc_lld_nontimerjobI(&lsData->job);
		} else if ((hsFlags & GADC_HSADC_RUNNING)) {
			hsFlags |= GADC_HSADC_CONVERTION;
			gadc_lld_timerjobI(&hsJob);
		} else
			hsFlags &= ~GADC_ADC_RUNNING;

	} else {

		// Did it fail
		if (!n) {
			// Push it back on the head of the queue - it didn't actually get done
			gfxQueueGSyncPushI(&lsListToDo, (gfxQueueGSyncItem *)lsData);
			lsData = 0;
			goto starttimerjob;
		}

		// A non-timer job completed - signal
		if (lsData->callback) {
			// Put it on the completed list and signal the timer to do the call-backs
			gfxQueueGSyncPutI(&lsListDone, (gfxQueueGSyncItem *)lsData);
			gtimerJabI(&lsGTimer);
		} else {
			// Signal the thread directly
			gfxSemSignalI(&lsData->sigdone);
		}
		lsData = 0;

		// Start a job preferring a timer job
starttimerjob:
		if ((hsFlags & GADC_HSADC_RUNNING)) {
			hsFlags |= GADC_HSADC_CONVERTION;
			gadc_lld_timerjobI(&hsJob);
		} else if ((lsData = (NonTimerData *)gfxQueueGSyncGetI(&lsListToDo))) {
			hsFlags &= ~GADC_HSADC_CONVERTION;
			gadc_lld_nontimerjobI(&lsData->job);
		} else
			hsFlags &= ~GADC_ADC_RUNNING;
	}
}

/* Our module initialiser */
void _gadcInit(void)
{
	gadc_lld_init();

	gfxQueueGSyncInit(&hsListDone);
	#if GFX_USE_GEVENT
		gtimerInit(&hsGTimer);
	#endif
	gtimerInit(&lsGTimer);
	gfxQueueGSyncInit(&lsListToDo);
	gfxQueueGSyncInit(&lsListDone);
}

void _gadcDeinit(void)
{
	/* commented stuff is ToDo */

	// gadc_lld_deinit();
	gfxQueueGSyncDeinit(&hsListDone);
	#if GFX_USE_GEVENT
		gtimerDeinit(&hsGTimer);
	#endif	
	gtimerDeinit(&lsGTimer);
	gfxQueueGSyncDeinit(&lsListToDo);
	gfxQueueGSyncDeinit(&lsListDone);
}

#if GFX_USE_GEVENT
	static void HighSpeedGTimerCallback(void *param) {
		(void) param;
		GSourceListener	*psl;
		GEventADC		*pe;

		psl = 0;
		while ((psl = geventGetSourceListener((GSourceHandle)(&hsGTimer), psl))) {
			if (!(pe = (GEventADC *)geventGetEventBuffer(psl))) {
				// This listener is missing - save this.
				psl->srcflags |= GADC_HSADC_LOSTEVENT;
				continue;
			}

			pe->type = GEVENT_ADC;
			pe->flags = (hsFlags & (GADC_HSADC_RUNNING|GADC_HSADC_GOTBUFFER|GADC_HSADC_STALL)) | psl->srcflags;
			psl->srcflags = 0;
			geventSendEvent(psl);
		}
	}
#endif

void gadcHighSpeedInit(uint32_t physdev, uint32_t frequency)
{
	if ((hsFlags & GADC_HSADC_RUNNING))
		gadcHighSpeedStop();

	/* Just save the details and reset everything for now */
	hsJob.physdev = physdev;
	hsJob.frequency = frequency;
	hsISRcallback = 0;
	hsBytesPerConv = gadc_lld_samplesperconversion(physdev) * sizeof(adcsample_t);
}

#if GFX_USE_GEVENT
	GSourceHandle gadcHighSpeedGetSource(void) {
		if (!gtimerIsActive(&hsGTimer))
			gtimerStart(&hsGTimer, HighSpeedGTimerCallback, 0, TRUE, TIME_INFINITE);
		hsFlags |= GADC_HSADC_GTIMER;
		return (GSourceHandle)&hsGTimer;
	}
#endif

void gadcHighSpeedSetISRCallback(GADCISRCallbackFunction isrfn) {
	hsISRcallback = isrfn;
}

GDataBuffer *gadcHighSpeedGetData(delaytime_t ms) {
	return (GDataBuffer *)gfxQueueGSyncGet(&hsListDone, ms);
}

GDataBuffer *gadcHighSpeedGetDataI(void) {
	return (GDataBuffer *)gfxQueueGSyncGetI(&hsListDone);
}

void gadcHighSpeedStart(void) {
	// Safety first
	if (!hsJob.frequency || !hsBytesPerConv)
		return;

	gfxSystemLock();
	if (!(hsFlags & GADC_HSADC_RUNNING)) {
		if (!(hsData = gfxBufferGetI())) {
			// Oops - no free buffers. Stall
			hsFlags |= GADC_HSADC_STALL;
			#if GFX_USE_GEVENT
				if (hsFlags & GADC_HSADC_GTIMER)
					gtimerJabI(&hsGTimer);
			#endif

		// Prepare the next job
		} else {

			#if GFX_USE_OS_CHIBIOS
				// ChibiOS api bug - samples must be even
				hsJob.todo = (hsData->size / hsBytesPerConv) & ~1;
			#else
				hsJob.todo = hsData->size / hsBytesPerConv;
			#endif
			hsJob.done = 0;
			hsJob.buffer = (adcsample_t *)(hsData+1);
			hsFlags |= GADC_HSADC_RUNNING;

			// Start the timer
			gadc_lld_start_timerI(hsJob.frequency);

			// If nothing is running start the job
			if (!(hsFlags & GADC_ADC_RUNNING)) {
				hsFlags |= (GADC_HSADC_CONVERTION|GADC_ADC_RUNNING);
				gadc_lld_timerjobI(&hsJob);
			}
		}
	}
	gfxSystemUnlock();
}

void gadcHighSpeedStop(void) {
	// Stop it and wait for completion
	hsFlags &= ~GADC_HSADC_RUNNING;
	while ((hsFlags & GADC_HSADC_CONVERTION))
		gfxYield();
}

static void LowSpeedGTimerCallback(void *param) {
	(void) param;
	NonTimerData		*pdata;

	// Look for completed non-timer jobs and call the call-backs for each
	while ((pdata = (NonTimerData *)gfxQueueGSyncGet(&lsListDone, TIME_IMMEDIATE))) {
		pdata->callback(pdata->job.buffer, pdata->param);
		gfxFree(pdata);
	}
}

void gadcLowSpeedGet(uint32_t physdev, adcsample_t *buffer) {
	NonTimerData ndata;

	// Prepare the job
	gfxSemInit(&ndata.sigdone, 0, 1);
	ndata.job.physdev = physdev;
	ndata.job.buffer = buffer;
	ndata.callback = 0;

	// Activate it
	gfxSystemLock();
	if (!(hsFlags & GADC_ADC_RUNNING)) {
		// Nothing is running - start the job
		lsData = &ndata;
		hsFlags |= GADC_ADC_RUNNING;
		hsFlags &= ~GADC_HSADC_CONVERTION;
		gadc_lld_nontimerjobI(&ndata.job);
	} else {
		// Just put it on the queue
		gfxQueueGSyncPutI(&lsListToDo, (gfxQueueGSyncItem *)&ndata);
	}
	gfxSystemUnlock();

	// Wait for it to complete
	gfxSemWait(&ndata.sigdone, TIME_INFINITE);
	gfxSemDestroy(&ndata.sigdone);
}

bool_t gadcLowSpeedStart(uint32_t physdev, adcsample_t *buffer, GADCCallbackFunction fn, void *param) {
	NonTimerData *pdata;

	/* Start the Low Speed Timer */
	if (!gtimerIsActive(&lsGTimer))
		gtimerStart(&lsGTimer, LowSpeedGTimerCallback, 0, TRUE, TIME_INFINITE);

	// Prepare the job
	if (!(pdata = gfxAlloc(sizeof(NonTimerData))))
		return FALSE;
	pdata->job.physdev = physdev;
	pdata->job.buffer = buffer;
	pdata->callback = fn;
	pdata->param = param;

	// Activate it
	gfxSystemLock();
	if (!(hsFlags & GADC_ADC_RUNNING)) {
		// Nothing is running - start the job
		lsData = pdata;
		hsFlags |= GADC_ADC_RUNNING;
		hsFlags &= ~GADC_HSADC_CONVERTION;
		gadc_lld_nontimerjobI(&pdata->job);
	} else {
		// Just put it on the queue
		gfxQueueGSyncPutI(&lsListToDo, (gfxQueueGSyncItem *)pdata);
	}
	gfxSystemUnlock();
	return TRUE;
}

#endif /* GFX_USE_GADC */
/** @} */