#define LOG_PREFIX "asix-sigma"
-#define USB_VENDOR 0xa600
-#define USB_PRODUCT 0xa000
-#define USB_DESCRIPTION "ASIX SIGMA"
-#define USB_VENDOR_NAME "ASIX"
-#define USB_MODEL_NAME "SIGMA"
+/*
+ * Triggers are not working in this implementation. Stop claiming
+ * support for the feature which effectively is not available, until
+ * the implementation got fixed. Yet keep the code in place and allow
+ * developers to turn on this switch during development.
+ */
+#define ASIX_SIGMA_WITH_TRIGGER 0
+
+/* Experimental support for OMEGA (scan only, operation is ENOIMPL). */
+#define ASIX_WITH_OMEGA 0
+
+#define USB_VENDOR_ASIX 0xa600
+#define USB_PRODUCT_SIGMA 0xa000
+#define USB_PRODUCT_OMEGA 0xa004
+
+enum asix_device_type {
+ ASIX_TYPE_NONE,
+ ASIX_TYPE_SIGMA,
+ ASIX_TYPE_OMEGA,
+};
+
+/*
+ * FPGA commands are 8bits wide. The upper nibble is a command opcode,
+ * the lower nibble can carry operand values. 8bit register addresses
+ * and 8bit data values get communicated in two steps.
+ */
+
+/* Register access. */
+#define REG_ADDR_LOW (0x0 << 4)
+#define REG_ADDR_HIGH (0x1 << 4)
+#define REG_DATA_LOW (0x2 << 4)
+#define REG_DATA_HIGH_WRITE (0x3 << 4)
+#define REG_READ_ADDR (0x4 << 4)
+#define REG_ADDR_ADJUST (1 << 0) /* Auto adjust register address. */
+#define REG_ADDR_DOWN (1 << 1) /* 1 decrement, 0 increment. */
+#define REG_ADDR_INC (REG_ADDR_ADJUST)
+#define REG_ADDR_DEC (REG_ADDR_ADJUST | REG_ADDR_DOWN)
+
+/* Sample memory access. */
+#define REG_DRAM_WAIT_ACK (0x5 << 4) /* Wait for completion. */
+#define REG_DRAM_BLOCK (0x6 << 4) /* DRAM to BRAM, plus bank select. */
+#define REG_DRAM_BLOCK_BEGIN (0x8 << 4) /* Read first BRAM bytes. */
+#define REG_DRAM_BLOCK_DATA (0xa << 4) /* Read full BRAM block. */
+#define REG_DRAM_SEL_N (0x1 << 4) /* Bank select, added to 6/8/a. */
+#define REG_DRAM_SEL_BOOL(b) ((b) ? REG_DRAM_SEL_N : 0)
+
+/*
+ * Registers at a specific address can have different meanings depending
+ * on whether data is read or written. This is why direction is part of
+ * the programming language identifiers.
+ *
+ * The vendor documentation suggests that in addition to the first 16
+ * register addresses which implement the logic analyzer's feature set,
+ * there are 240 more registers in the 16 to 255 address range which
+ * are available to applications and plugin features. Can libsigrok's
+ * asix-sigma driver store configuration data there, to avoid expensive
+ * operations (think: firmware re-load).
+ */
enum sigma_write_register {
WRITE_CLOCK_SELECT = 0,
- WRITE_TRIGGER_SELECT0 = 1,
- WRITE_TRIGGER_SELECT1 = 2,
+ WRITE_TRIGGER_SELECT = 1,
+ WRITE_TRIGGER_SELECT2 = 2,
WRITE_MODE = 3,
WRITE_MEMROW = 4,
WRITE_POST_TRIGGER = 5,
WRITE_TRIGGER_OPTION = 6,
WRITE_PIN_VIEW = 7,
-
+ /* Unassigned register locations. */
WRITE_TEST = 15,
};
READ_PIN_CHANGE_HIGH = 9,
READ_BLOCK_LAST_TS_LOW = 10,
READ_BLOCK_LAST_TS_HIGH = 11,
- READ_PIN_VIEW = 12,
-
+ READ_BLOCK_TS_OVERRUN = 12,
+ READ_PIN_VIEW = 13,
+ /* Unassigned register location. */
READ_TEST = 15,
};
-#define REG_ADDR_LOW (0x0 << 4)
-#define REG_ADDR_HIGH (0x1 << 4)
-#define REG_DATA_LOW (0x2 << 4)
-#define REG_DATA_HIGH_WRITE (0x3 << 4)
-#define REG_READ_ADDR (0x4 << 4)
-#define REG_DRAM_WAIT_ACK (0x5 << 4)
-
-/* Bit (1 << 4) can be low or high (double buffer / cache) */
-#define REG_DRAM_BLOCK (0x6 << 4)
-#define REG_DRAM_BLOCK_BEGIN (0x8 << 4)
-#define REG_DRAM_BLOCK_DATA (0xa << 4)
-
#define LEDSEL0 6
#define LEDSEL1 7
-#define NEXT_REG 1
-
-#define EVENTS_PER_CLUSTER 7
-
-#define CHUNK_SIZE 1024
+/* WRITE_MODE register fields. */
+#define WMR_SDRAMWRITEEN (1 << 0)
+#define WMR_SDRAMREADEN (1 << 1)
+#define WMR_TRGRES (1 << 2)
+#define WMR_TRGEN (1 << 3)
+#define WMR_FORCESTOP (1 << 4)
+#define WMR_TRGSW (1 << 5)
+/* not used: bit position 6 */
+#define WMR_SDRAMINIT (1 << 7)
+
+/* READ_MODE register fields. */
+#define RMR_SDRAMWRITEEN (1 << 0)
+#define RMR_SDRAMREADEN (1 << 1)
+/* not used: bit position 2 */
+#define RMR_TRGEN (1 << 3)
+#define RMR_ROUND (1 << 4)
+#define RMR_TRIGGERED (1 << 5)
+#define RMR_POSTTRIGGERED (1 << 6)
+/* not used: bit position 7 */
/*
- * The entire ASIX Sigma DRAM is an array of struct sigma_dram_line[1024];
+ * Layout of the sample data DRAM, which will be downloaded to the PC:
+ *
+ * Sigma memory is organized in 32K rows. Each row contains 64 clusters.
+ * Each cluster contains a timestamp (16bit) and 7 events (16bits each).
+ * Events contain 16 bits of sample data (potentially taken at multiple
+ * sample points, see below).
+ *
+ * Total memory size is 32K x 64 x 8 x 2 bytes == 32 MiB (256 Mbit). The
+ * size of a memory row is 1024 bytes. Assuming x16 organization of the
+ * memory array, address specs (sample count, trigger position) are kept
+ * in 24bit entities. The upper 15 bit address the "row", the lower 9 bit
+ * refer to the "event" within the row. Because there is one timestamp for
+ * seven events each, one memory row can hold up to 64x7 == 448 events.
+ *
+ * Sample data is represented in 16bit quantities. The first sample in
+ * the cluster corresponds to the cluster's timestamp. Each next sample
+ * corresponds to the timestamp + 1, timestamp + 2, etc (the distance is
+ * one sample period, according to the samplerate). In the absence of
+ * pin level changes, no data is provided (RLE compression). A cluster
+ * is enforced for each 64K ticks of the timestamp, to reliably handle
+ * rollover and determine the next timestamp of the next cluster.
+ *
+ * For samplerates up to 50MHz, an event directly translates to one set
+ * of sample data at a single sample point, spanning up to 16 channels.
+ * For samplerates of 100MHz, there is one 16 bit entity for each 20ns
+ * period (50MHz rate). The 16 bit memory contains 2 samples of up to
+ * 8 channels. Bits of multiple samples are interleaved. For samplerates
+ * of 200MHz one 16bit entity contains 4 samples of up to 4 channels,
+ * each 5ns apart.
*/
-/* One "DRAM cluster" contains a timestamp and 7 samples, 16b total. */
-struct sigma_dram_cluster {
- uint8_t timestamp_lo;
- uint8_t timestamp_hi;
- struct {
- uint8_t sample_hi;
- uint8_t sample_lo;
- } samples[7];
-};
+#define ROW_COUNT 32768
+#define ROW_LENGTH_BYTES 1024
+#define ROW_LENGTH_U16 (ROW_LENGTH_BYTES / sizeof(uint16_t))
+#define ROW_SHIFT 9 /* log2 of u16 count */
+#define ROW_MASK ((1UL << ROW_SHIFT) - 1)
+#define EVENTS_PER_CLUSTER 7
+#define CLUSTERS_PER_ROW (ROW_LENGTH_U16 / (1 + EVENTS_PER_CLUSTER))
+#define EVENTS_PER_ROW (CLUSTERS_PER_ROW * EVENTS_PER_CLUSTER)
-/* One "DRAM line" contains 64 "DRAM clusters", 1024b total. */
struct sigma_dram_line {
- struct sigma_dram_cluster cluster[64];
+ struct sigma_dram_cluster {
+ uint8_t timestamp_lo;
+ uint8_t timestamp_hi;
+ struct sigma_dram_event {
+ uint8_t sample_hi;
+ uint8_t sample_lo;
+ } samples[EVENTS_PER_CLUSTER];
+ } cluster[CLUSTERS_PER_ROW];
};
struct clockselect_50 {
SIGMA_UNINITIALIZED = 0,
SIGMA_IDLE,
SIGMA_CAPTURE,
+ SIGMA_STOPPING,
SIGMA_DOWNLOAD,
} state;
-
uint16_t lastts;
uint16_t lastsample;
};
-/* Private, per-device-instance driver context. */
+struct submit_buffer;
+
struct dev_context {
+ struct {
+ uint16_t vid, pid;
+ uint32_t serno;
+ uint16_t prefix;
+ enum asix_device_type type;
+ } id;
struct ftdi_context ftdic;
- uint64_t cur_samplerate;
- uint64_t period_ps;
- uint64_t limit_msec;
- struct timeval start_tv;
+ uint64_t samplerate;
+ struct sr_sw_limits cfg_limits; /* Configured limits (user specified). */
+ struct sr_sw_limits acq_limits; /* Acquisition limits (internal use). */
+ struct sr_sw_limits feed_limits; /* Datafeed limits (internal use). */
int cur_firmware;
int num_channels;
- int cur_channels;
int samples_per_event;
- int capture_ratio;
+ uint64_t capture_ratio;
struct sigma_trigger trigger;
int use_triggers;
struct sigma_state state;
+ struct submit_buffer *buffer;
};
extern SR_PRIV const uint64_t samplerates[];
extern SR_PRIV const size_t samplerates_count;
-SR_PRIV int sigma_write_register(uint8_t reg, uint8_t *data, size_t len,
+SR_PRIV int sigma_write_register(uint8_t reg, uint8_t *data, size_t len,
struct dev_context *devc);
SR_PRIV int sigma_set_register(uint8_t reg, uint8_t value, struct dev_context *devc);
SR_PRIV int sigma_write_trigger_lut(struct triggerlut *lut, struct dev_context *devc);
-SR_PRIV void sigma_clear_helper(void *priv);
-SR_PRIV int sigma_set_samplerate(const struct sr_dev_inst *sdi, uint64_t samplerate);
+SR_PRIV int sigma_normalize_samplerate(uint64_t want_rate, uint64_t *have_rate);
+SR_PRIV int sigma_set_samplerate(const struct sr_dev_inst *sdi);
+SR_PRIV int sigma_set_acquire_timeout(struct dev_context *devc);
SR_PRIV int sigma_convert_trigger(const struct sr_dev_inst *sdi);
SR_PRIV int sigma_receive_data(int fd, int revents, void *cb_data);
SR_PRIV int sigma_build_basic_trigger(struct triggerlut *lut, struct dev_context *devc);
projects / libsigrok.git / blobdiff