2 * This file is part of the libsigrok project.
4 * Copyright (C) 2010-2012 Håvard Espeland <gus@ping.uio.no>,
5 * Copyright (C) 2010 Martin Stensgård <mastensg@ping.uio.no>
6 * Copyright (C) 2010 Carl Henrik Lunde <chlunde@ping.uio.no>
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #ifndef LIBSIGROK_HARDWARE_ASIX_SIGMA_PROTOCOL_H
23 #define LIBSIGROK_HARDWARE_ASIX_SIGMA_PROTOCOL_H
30 #include <libsigrok/libsigrok.h>
31 #include "libsigrok-internal.h"
33 #define LOG_PREFIX "asix-sigma"
36 * Triggers are not working in this implementation. Stop claiming
37 * support for the feature which effectively is not available, until
38 * the implementation got fixed. Yet keep the code in place and allow
39 * developers to turn on this switch during development.
41 #define ASIX_SIGMA_WITH_TRIGGER 0
43 /* Experimental support for OMEGA (scan only, operation is ENOIMPL). */
44 #define ASIX_WITH_OMEGA 0
46 #define USB_VENDOR_ASIX 0xa600
47 #define USB_PRODUCT_SIGMA 0xa000
48 #define USB_PRODUCT_OMEGA 0xa004
50 enum asix_device_type {
56 enum sigma_write_register {
57 WRITE_CLOCK_SELECT = 0,
58 WRITE_TRIGGER_SELECT = 1,
59 WRITE_TRIGGER_SELECT2 = 2,
62 WRITE_POST_TRIGGER = 5,
63 WRITE_TRIGGER_OPTION = 6,
65 /* Unassigned register locations. */
69 enum sigma_read_register {
71 READ_TRIGGER_POS_LOW = 1,
72 READ_TRIGGER_POS_HIGH = 2,
73 READ_TRIGGER_POS_UP = 3,
74 READ_STOP_POS_LOW = 4,
75 READ_STOP_POS_HIGH = 5,
78 READ_PIN_CHANGE_LOW = 8,
79 READ_PIN_CHANGE_HIGH = 9,
80 READ_BLOCK_LAST_TS_LOW = 10,
81 READ_BLOCK_LAST_TS_HIGH = 11,
82 READ_BLOCK_TS_OVERRUN = 12,
84 /* Unassigned register location. */
89 * FPGA commands are 8bits wide. The upper nibble is a command opcode,
90 * the lower nibble can carry operand values. 8bit register addresses
91 * and 8bit data values get communicated in two steps.
94 /* Register access. */
95 #define REG_ADDR_LOW (0x0 << 4)
96 #define REG_ADDR_HIGH (0x1 << 4)
97 #define REG_DATA_LOW (0x2 << 4)
98 #define REG_DATA_HIGH_WRITE (0x3 << 4)
99 #define REG_READ_ADDR (0x4 << 4)
100 #define REG_ADDR_ADJUST (1 << 0) /* Auto adjust register address. */
101 #define REG_ADDR_DOWN (1 << 1) /* 1 decrement, 0 increment. */
102 #define REG_ADDR_INC (REG_ADDR_ADJUST)
103 #define REG_ADDR_DEC (REG_ADDR_ADJUST | REG_ADDR_DOWN)
105 /* Sample memory access. */
106 #define REG_DRAM_WAIT_ACK (0x5 << 4) /* Wait for completion. */
107 #define REG_DRAM_BLOCK (0x6 << 4) /* DRAM to BRAM, plus bank select. */
108 #define REG_DRAM_BLOCK_BEGIN (0x8 << 4) /* Read first BRAM bytes. */
109 #define REG_DRAM_BLOCK_DATA (0xa << 4) /* Read full BRAM block. */
110 #define REG_DRAM_SEL_N (0x1 << 4) /* Bank select, added to 6/8/a. */
111 #define REG_DRAM_SEL_BOOL(b) ((b) ? REG_DRAM_SEL_N : 0)
117 #define EVENTS_PER_CLUSTER 7
119 #define CHUNK_SIZE 1024
121 /* WRITE_MODE register fields. */
122 #define WMR_SDRAMWRITEEN (1 << 0)
123 #define WMR_SDRAMREADEN (1 << 1)
124 #define WMR_TRGRES (1 << 2)
125 #define WMR_TRGEN (1 << 3)
126 #define WMR_FORCESTOP (1 << 4)
127 #define WMR_TRGSW (1 << 5)
128 /* not used: bit position 6 */
129 #define WMR_SDRAMINIT (1 << 7)
131 /* READ_MODE register fields. */
132 #define RMR_SDRAMWRITEEN (1 << 0)
133 #define RMR_SDRAMREADEN (1 << 1)
134 /* not used: bit position 2 */
135 #define RMR_TRGEN (1 << 3)
136 #define RMR_ROUND (1 << 4)
137 #define RMR_TRIGGERED (1 << 5)
138 #define RMR_POSTTRIGGERED (1 << 6)
139 /* not used: bit position 7 */
142 * Layout of the sample data DRAM, which will be downloaded to the PC:
144 * Sigma memory is organized in 32K rows. Each row contains 64 clusters.
145 * Each cluster contains a timestamp (16bit) and 7 samples (16bits each).
146 * Total memory size is 32K x 64 x 8 x 2 bytes == 32 MB (256 Mbit).
148 * Sample data is represented in 16bit quantities. The first sample in
149 * the cluster corresponds to the cluster's timestamp. Each next sample
150 * corresponds to the timestamp + 1, timestamp + 2, etc (the distance is
151 * one sample period, according to the samplerate). In the absence of
152 * pin level changes, no data is provided (RLE compression). A cluster
153 * is enforced for each 64K ticks of the timestamp, to reliably handle
154 * rollover and determination of the next timestamp of the next cluster.
156 * For samplerates of 100MHz, there is one 16 bit entity for each 20ns
157 * period (50MHz rate). The 16 bit memory contains 2 samples of up to
158 * 8 channels. Bits of multiple samples are interleaved. For samplerates
159 * of 200MHz one 16bit entity contains 4 samples of up to 4 channels,
162 * Memory addresses (sample count, trigger position) are kept in 24bit
163 * entities. The upper 15 bit refer to the "row", the lower 9 bit refer
164 * to the "event" within the row. Because there is one timestamp for
165 * seven samples each, one memory row can hold up to 64x7 == 448 samples.
168 /* One "DRAM cluster" contains a timestamp and 7 samples, 16b total. */
169 struct sigma_dram_cluster {
170 uint8_t timestamp_lo;
171 uint8_t timestamp_hi;
178 /* One "DRAM line" contains 64 "DRAM clusters", 1024b total. */
179 struct sigma_dram_line {
180 struct sigma_dram_cluster cluster[64];
183 struct clockselect_50 {
186 uint16_t disabled_channels;
189 /* The effect of all these are still a bit unclear. */
190 struct triggerinout {
191 uint8_t trgout_resistor_enable : 1;
192 uint8_t trgout_resistor_pullup : 1;
193 uint8_t reserved1 : 1;
194 uint8_t trgout_bytrigger : 1;
195 uint8_t trgout_byevent : 1;
196 uint8_t trgout_bytriggerin : 1;
197 uint8_t reserved2 : 2;
199 /* Should be set same as the first two */
200 uint8_t trgout_resistor_enable2 : 1;
201 uint8_t trgout_resistor_pullup2 : 1;
203 uint8_t reserved3 : 1;
204 uint8_t trgout_long : 1;
205 uint8_t trgout_pin : 1; /* Use 1k resistor. Pullup? */
206 uint8_t trgin_negate : 1;
207 uint8_t trgout_enable : 1;
208 uint8_t trgin_enable : 1;
212 /* The actual LUTs. */
213 uint16_t m0d[4], m1d[4], m2d[4];
214 uint16_t m3, m3s, m4;
216 /* Parameters should be sent as a single register write. */
219 uint8_t selpresc : 6;
231 /* Trigger configuration */
232 struct sigma_trigger {
233 /* Only two channels can be used in mask. */
235 uint16_t fallingmask;
237 /* Simple trigger support (<= 50 MHz). */
239 uint16_t simplevalue;
241 /* TODO: Advanced trigger support (boolean expressions). */
244 /* Events for trigger operation. */
256 /* Logical functions for trigger operation. */
268 SIGMA_UNINITIALIZED = 0,
283 enum asix_device_type type;
285 struct ftdi_context ftdic;
286 uint64_t cur_samplerate;
288 uint64_t limit_samples;
289 uint64_t sent_samples;
294 int samples_per_event;
295 uint64_t capture_ratio;
296 struct sigma_trigger trigger;
298 struct sigma_state state;
301 extern SR_PRIV const uint64_t samplerates[];
302 extern SR_PRIV const size_t samplerates_count;
304 SR_PRIV int sigma_write_register(uint8_t reg, uint8_t *data, size_t len,
305 struct dev_context *devc);
306 SR_PRIV int sigma_set_register(uint8_t reg, uint8_t value, struct dev_context *devc);
307 SR_PRIV int sigma_write_trigger_lut(struct triggerlut *lut, struct dev_context *devc);
308 SR_PRIV uint64_t sigma_limit_samples_to_msec(const struct dev_context *devc,
309 uint64_t limit_samples);
310 SR_PRIV int sigma_set_samplerate(const struct sr_dev_inst *sdi, uint64_t samplerate);
311 SR_PRIV int sigma_convert_trigger(const struct sr_dev_inst *sdi);
312 SR_PRIV int sigma_receive_data(int fd, int revents, void *cb_data);
313 SR_PRIV int sigma_build_basic_trigger(struct triggerlut *lut, struct dev_context *devc);