summaryrefslogtreecommitdiff
path: root/src/examples/ad9371-iiostream.c
blob: f330377cd13bddd5b17bfdd4d40006604f2edf8c (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
/*
 * libiio - AD9371 IIO streaming example
 *
 * Copyright (C) 2014 IABG mbH
 * Author: Michael Feilen <feilen_at_iabg.de>
 * Copyright (C) 2017 Analog Devices Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 **/

#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <signal.h>
#include <stdio.h>

#ifdef __APPLE__
#include <iio/iio.h>
#else
#include <iio.h>
#endif

/* helper macros */
#define MHZ(x) ((long long)(x*1000000.0 + .5))
#define GHZ(x) ((long long)(x*1000000000.0 + .5))

#define ASSERT(expr) { \
	if (!(expr)) { \
		(void) fprintf(stderr, "assertion failed (%s:%d)\n", __FILE__, __LINE__); \
		(void) abort(); \
	} \
}

/* RX is input, TX is output */
enum iodev { RX, TX };

/* common RX and TX streaming params */
struct stream_cfg {
	long long lo_hz; // Local oscillator frequency in Hz
};

/* static scratch mem for strings */
static char tmpstr[64];

/* IIO structs required for streaming */
static struct iio_context *ctx   = NULL;
static struct iio_channel *rx0_i = NULL;
static struct iio_channel *rx0_q = NULL;
static struct iio_channel *tx0_i = NULL;
static struct iio_channel *tx0_q = NULL;
static struct iio_buffer  *rxbuf = NULL;
static struct iio_buffer  *txbuf = NULL;

static bool stop;

/* cleanup and exit */
static void shutdown()
{
	printf("* Destroying buffers\n");
	if (rxbuf) { iio_buffer_destroy(rxbuf); }
	if (txbuf) { iio_buffer_destroy(txbuf); }

	printf("* Disabling streaming channels\n");
	if (rx0_i) { iio_channel_disable(rx0_i); }
	if (rx0_q) { iio_channel_disable(rx0_q); }
	if (tx0_i) { iio_channel_disable(tx0_i); }
	if (tx0_q) { iio_channel_disable(tx0_q); }

	printf("* Destroying context\n");
	if (ctx) { iio_context_destroy(ctx); }
	exit(0);
}

static void handle_sig(int sig)
{
	printf("Waiting for process to finish...\n");
	stop = true;
}

/* check return value of attr_write function */
static void errchk(int v, const char* what) {
	 if (v < 0) { fprintf(stderr, "Error %d writing to channel \"%s\"\nvalue may not be supported.\n", v, what); shutdown(); }
}

/* write attribute: long long int */
static void wr_ch_lli(struct iio_channel *chn, const char* what, long long val)
{
	errchk(iio_channel_attr_write_longlong(chn, what, val), what);
}

/* write attribute: long long int */
static long long rd_ch_lli(struct iio_channel *chn, const char* what)
{
	long long val;

	errchk(iio_channel_attr_read_longlong(chn, what, &val), what);

	printf("\t %s: %lld\n", what, val);
	return val;
}

#if 0
/* write attribute: string */
static void wr_ch_str(struct iio_channel *chn, const char* what, const char* str)
{
	errchk(iio_channel_attr_write(chn, what, str), what);
}
#endif

/* helper function generating channel names */
static char* get_ch_name_mod(const char* type, int id, char modify)
{
	snprintf(tmpstr, sizeof(tmpstr), "%s%d_%c", type, id, modify);
	return tmpstr;
}

/* helper function generating channel names */
static char* get_ch_name(const char* type, int id)
{
	snprintf(tmpstr, sizeof(tmpstr), "%s%d", type, id);
	return tmpstr;
}

/* returns ad9371 phy device */
static struct iio_device* get_ad9371_phy(struct iio_context *ctx)
{
	struct iio_device *dev =  iio_context_find_device(ctx, "ad9371-phy");
	ASSERT(dev && "No ad9371-phy found");
	return dev;
}

/* finds AD9371 streaming IIO devices */
static bool get_ad9371_stream_dev(struct iio_context *ctx, enum iodev d, struct iio_device **dev)
{
	switch (d) {
	case TX: *dev = iio_context_find_device(ctx, "axi-ad9371-tx-hpc"); return *dev != NULL;
	case RX: *dev = iio_context_find_device(ctx, "axi-ad9371-rx-hpc");  return *dev != NULL;
	default: ASSERT(0); return false;
	}
}

/* finds AD9371 streaming IIO channels */
static bool get_ad9371_stream_ch(struct iio_context *ctx, enum iodev d, struct iio_device *dev, int chid, char modify, struct iio_channel **chn)
{
	*chn = iio_device_find_channel(dev, modify ? get_ch_name_mod("voltage", chid, modify) : get_ch_name("voltage", chid), d == TX);
	if (!*chn)
		*chn = iio_device_find_channel(dev, modify ? get_ch_name_mod("voltage", chid, modify) : get_ch_name("voltage", chid), d == TX);
	return *chn != NULL;
}

/* finds AD9371 phy IIO configuration channel with id chid */
static bool get_phy_chan(struct iio_context *ctx, enum iodev d, int chid, struct iio_channel **chn)
{
	switch (d) {
	case RX: *chn = iio_device_find_channel(get_ad9371_phy(ctx), get_ch_name("voltage", chid), false); return *chn != NULL;
	case TX: *chn = iio_device_find_channel(get_ad9371_phy(ctx), get_ch_name("voltage", chid), true);  return *chn != NULL;
	default: ASSERT(0); return false;
	}
}

/* finds AD9371 local oscillator IIO configuration channels */
static bool get_lo_chan(struct iio_context *ctx, enum iodev d, struct iio_channel **chn)
{
	switch (d) {
	 // LO chan is always output, i.e. true
	case RX: *chn = iio_device_find_channel(get_ad9371_phy(ctx), get_ch_name("altvoltage", 0), true); return *chn != NULL;
	case TX: *chn = iio_device_find_channel(get_ad9371_phy(ctx), get_ch_name("altvoltage", 1), true); return *chn != NULL;
	default: ASSERT(0); return false;
	}
}

/* applies streaming configuration through IIO */
bool cfg_ad9371_streaming_ch(struct iio_context *ctx, struct stream_cfg *cfg, enum iodev type, int chid)
{
	struct iio_channel *chn = NULL;

	// Configure phy and lo channels
	printf("* Acquiring AD9371 phy %s channel %d\n", type == TX ? "TX" : "RX", chid);
	if (!get_phy_chan(ctx, type, chid, &chn)) {	return false; }

	rd_ch_lli(chn, "rf_bandwidth");
	rd_ch_lli(chn, "sampling_frequency");

	// Configure LO channel
	printf("* Acquiring AD9371 %s lo channel\n", type == TX ? "TX" : "RX");
	if (!get_lo_chan(ctx, type, &chn)) { return false; }
	wr_ch_lli(chn, type == TX ? "TX_LO_frequency" : "RX_LO_frequency" , cfg->lo_hz);
	return true;
}

/* simple configuration and streaming */
int main (int argc, char **argv)
{
	// Streaming devices
	struct iio_device *tx;
	struct iio_device *rx;

	// RX and TX sample counters
	size_t nrx = 0;
	size_t ntx = 0;

	// Stream configurations
	struct stream_cfg rxcfg;
	struct stream_cfg txcfg;

	// Listen to ctrl+c and ASSERT
	signal(SIGINT, handle_sig);

	// RX stream config
	rxcfg.lo_hz = GHZ(2.5); // 2.5 GHz rf frequency

	// TX stream config
	txcfg.lo_hz = GHZ(2.5); // 2.5 GHz rf frequency

	printf("* Acquiring IIO context\n");
	ASSERT((ctx = iio_create_default_context()) && "No context");
	ASSERT(iio_context_get_devices_count(ctx) > 0 && "No devices");

	printf("* Acquiring AD9371 streaming devices\n");
	ASSERT(get_ad9371_stream_dev(ctx, TX, &tx) && "No tx dev found");
	ASSERT(get_ad9371_stream_dev(ctx, RX, &rx) && "No rx dev found");

	printf("* Configuring AD9371 for streaming\n");
	ASSERT(cfg_ad9371_streaming_ch(ctx, &rxcfg, RX, 0) && "RX port 0 not found");
	ASSERT(cfg_ad9371_streaming_ch(ctx, &txcfg, TX, 0) && "TX port 0 not found");

	printf("* Initializing AD9371 IIO streaming channels\n");
	ASSERT(get_ad9371_stream_ch(ctx, RX, rx, 0, 'i', &rx0_i) && "RX chan i not found");
	ASSERT(get_ad9371_stream_ch(ctx, RX, rx, 0, 'q', &rx0_q) && "RX chan q not found");
	ASSERT(get_ad9371_stream_ch(ctx, TX, tx, 0, 0, &tx0_i) && "TX chan i not found");
	ASSERT(get_ad9371_stream_ch(ctx, TX, tx, 1, 0, &tx0_q) && "TX chan q not found");

	printf("* Enabling IIO streaming channels\n");
	iio_channel_enable(rx0_i);
	iio_channel_enable(rx0_q);
	iio_channel_enable(tx0_i);
	iio_channel_enable(tx0_q);

	printf("* Creating non-cyclic IIO buffers with 1 MiS\n");
	rxbuf = iio_device_create_buffer(rx, 1024*1024, false);
	if (!rxbuf) {
		perror("Could not create RX buffer");
		shutdown();
	}
	txbuf = iio_device_create_buffer(tx, 1024*1024, false);
	if (!txbuf) {
		perror("Could not create TX buffer");
		shutdown();
	}

	printf("* Starting IO streaming (press CTRL+C to cancel)\n");
	while (!stop)
	{
		ssize_t nbytes_rx, nbytes_tx;
		char *p_dat, *p_end;
		ptrdiff_t p_inc;

		// Schedule TX buffer
		nbytes_tx = iio_buffer_push(txbuf);
		if (nbytes_tx < 0) { printf("Error pushing buf %d\n", (int) nbytes_tx); shutdown(); }

		// Refill RX buffer
		nbytes_rx = iio_buffer_refill(rxbuf);
		if (nbytes_rx < 0) { printf("Error refilling buf %d\n",(int) nbytes_rx); shutdown(); }

		// READ: Get pointers to RX buf and read IQ from RX buf port 0
		p_inc = iio_buffer_step(rxbuf);
		p_end = iio_buffer_end(rxbuf);
		for (p_dat = iio_buffer_first(rxbuf, rx0_i); p_dat < p_end; p_dat += p_inc) {
			// Example: swap I and Q
			const int16_t i = ((int16_t*)p_dat)[0]; // Real (I)
			const int16_t q = ((int16_t*)p_dat)[1]; // Imag (Q)
			((int16_t*)p_dat)[0] = q;
			((int16_t*)p_dat)[1] = i;
		}

		// WRITE: Get pointers to TX buf and write IQ to TX buf port 0
		p_inc = iio_buffer_step(txbuf);
		p_end = iio_buffer_end(txbuf);
		for (p_dat = iio_buffer_first(txbuf, tx0_i); p_dat < p_end; p_dat += p_inc) {
			// Example: fill with zeros
			// 14-bit sample needs to be MSB alligned so shift by 2
			// https://wiki.analog.com/resources/eval/user-guides/ad-fmcomms2-ebz/software/basic_iq_datafiles#binary_format
			((int16_t*)p_dat)[0] = 0 << 2; // Real (I)
			((int16_t*)p_dat)[1] = 0 << 2; // Imag (Q)
		}

		// Sample counter increment and status output
		nrx += nbytes_rx / iio_device_get_sample_size(rx);
		ntx += nbytes_tx / iio_device_get_sample_size(tx);
		printf("\tRX %8.2f MSmp, TX %8.2f MSmp\n", nrx/1e6, ntx/1e6);
	}

	shutdown();

	return 0;
}