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LA8: Eliminate magic numbers.

This commit is contained in:
Uwe Hermann 2011-05-08 20:20:26 +02:00
parent 4d7b525ae9
commit a76983fd20
1 changed files with 31 additions and 30 deletions
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61
hardware/chronovu-la8/chronovu-la8.c
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@ -36,6 +36,9 @@
#define SDRAM_SIZE (8 * 1024 * 1024)
#define MIN_NUM_SAMPLES 1
#define BS 4096 /* Block size */
#define NUM_BLOCKS 2048 /* Number of blocks */
static GSList *device_instances = NULL;
struct la8 {
@ -55,10 +58,10 @@ struct la8 {
gpointer session_id;
/**
* An 4KB buffer containing some (mangled) samples from the device.
* A buffer containing some (mangled) samples from the device.
* Format: Pretty mangled-up (due to hardware reasons), see code.
*/
uint8_t mangled_buf[4096];
uint8_t mangled_buf[BS];
/**
* An 8MB buffer where we'll store the de-mangled samples.
@ -88,7 +91,7 @@ struct la8 {
/** TODO */
time_t done;
/** Counter/index for the data block (0..2047) to be read. */
/** Counter/index for the data block to be read. */
int block_counter;
/** The divcount value (determines the sample period) for the LA8. */
@ -363,7 +366,7 @@ static int la8_close_usb_reset_sequencer(struct la8 *la8)
*/
static int la8_reset(struct la8 *la8)
{
uint8_t buf[4096];
uint8_t buf[BS];
time_t done, now;
int bytes_read;
@ -386,7 +389,7 @@ static int la8_reset(struct la8 *la8)
done = 20 + time(NULL);
do {
/* TODO: Ignore errors? Check for < 0 at least! */
bytes_read = la8_read(la8, (uint8_t *)&buf, 4096);
bytes_read = la8_read(la8, (uint8_t *)&buf, BS);
now = time(NULL);
} while ((done > now) && (bytes_read > 0));
@ -479,7 +482,7 @@ static int hw_init(const char *deviceinfo)
la8->limit_msec = 0;
la8->limit_samples = 0;
la8->session_id = NULL;
memset(la8->mangled_buf, 0, 4096);
memset(la8->mangled_buf, 0, BS);
la8->final_buf = NULL;
la8->trigger_pattern = 0x00; /* Value irrelevant, see trigger_mask. */
la8->trigger_mask = 0x00; /* All probes are "don't care". */
@ -815,7 +818,7 @@ static int hw_set_configuration(int device_index, int capability, void *value)
}
/**
* Get a block of 4096 bytes of data from the LA8.
* Get a block of data from the LA8.
*
* @param la8 The LA8 struct containing private per-device-instance data.
* @return SR_OK upon success, or SR_ERR upon errors.
@ -837,20 +840,20 @@ static int la8_read_block(struct la8 *la8)
// sr_dbg("la8: %s: reading block %d", __func__, la8->block_counter);
bytes_read = la8_read(la8, la8->mangled_buf, 4096);
bytes_read = la8_read(la8, la8->mangled_buf, BS);
/* If first block read got 0 bytes, retry until success or timeout. */
if ((bytes_read == 0) && (la8->block_counter == 0)) {
do {
// sr_dbg("la8: %s: reading block 0 again", __func__);
bytes_read = la8_read(la8, la8->mangled_buf, 4096);
bytes_read = la8_read(la8, la8->mangled_buf, BS);
/* TODO: How to handle read errors here? */
now = time(NULL);
} while ((la8->done > now) && (bytes_read == 0));
}
/* Check if block read was successful or a timeout occured. */
if (bytes_read != 4096) {
if (bytes_read != BS) {
sr_warn("la8: %s: trigger timed out", __func__);
(void) la8_reset(la8); /* Ignore errors. */
return SR_ERR;
@ -858,10 +861,10 @@ static int la8_read_block(struct la8 *la8)
/* De-mangle the data. */
// sr_dbg("la8: de-mangling samples of block %d", la8->block_counter);
byte_offset = la8->block_counter * 4096;
byte_offset = la8->block_counter * BS;
m = byte_offset / (1024 * 1024);
mi = m * (1024 * 1024);
for (i = 0; i < 4096; i++) {
for (i = 0; i < BS; i++) {
p = i & (1 << 0);
index = m * 2 + (((byte_offset + i) - mi) / 2) * 16;
index += (la8->divcount == 0) ? p : (1 - p);
@ -883,12 +886,12 @@ static void send_block_to_session_bus(struct la8 *la8, int block)
/* Check if we can find the trigger condition in this block. */
trigger_point = -1;
expected_sample = la8->trigger_pattern & la8->trigger_mask;
for (i = 0; i < 4096; i++) {
for (i = 0; i < BS; i++) {
/* Don't continue if the trigger was found previously. */
if (la8->trigger_found)
break;
sample = *(la8->final_buf + (block * 4096) + i);
sample = *(la8->final_buf + (block * BS) + i);
if ((sample & la8->trigger_mask) == expected_sample) {
trigger_point = i;
@ -899,12 +902,12 @@ static void send_block_to_session_bus(struct la8 *la8, int block)
/* If no trigger was found, send one SR_DF_LOGIC packet. */
if (trigger_point == -1) {
/* Send a 4096 byte SR_DF_LOGIC packet to the session bus. */
/* Send an SR_DF_LOGIC packet to the session bus. */
// sr_dbg("la8: %s: sending SR_DF_LOGIC packet", __func__);
packet.type = SR_DF_LOGIC;
packet.length = 4096;
packet.length = BS;
packet.unitsize = 1;
packet.payload = la8->final_buf + (block * 4096);
packet.payload = la8->final_buf + (block * BS);
sr_session_bus(la8->session_id, &packet);
return;
}
@ -923,17 +926,17 @@ static void send_block_to_session_bus(struct la8 *la8, int block)
/* Send pre-trigger SR_DF_LOGIC packet to the session bus. */
sr_dbg("la8: %s: sending pre-trigger SR_DF_LOGIC packet, ",
"start = %" PRIu64 ", length = %d", __func__,
block * 4096, trigger_point);
block * BS, trigger_point);
packet.type = SR_DF_LOGIC;
packet.length = trigger_point;
packet.unitsize = 1;
packet.payload = la8->final_buf + (block * 4096);
packet.payload = la8->final_buf + (block * BS);
sr_session_bus(la8->session_id, &packet);
}
/* Send the SR_DF_TRIGGER packet to the session bus. */
sr_dbg("la8: %s: sending SR_DF_TRIGGER packet, sample = %" PRIu64,
__func__, (block * 4096) + trigger_point);
__func__, (block * BS) + trigger_point);
packet.type = SR_DF_TRIGGER;
packet.length = 0;
packet.unitsize = 0;
@ -941,17 +944,15 @@ static void send_block_to_session_bus(struct la8 *la8, int block)
sr_session_bus(la8->session_id, &packet);
/* If at least one sample is located after the trigger... */
if (trigger_point < (4096 - 1)) {
if (trigger_point < (BS - 1)) {
/* Send post-trigger SR_DF_LOGIC packet to the session bus. */
sr_dbg("la8: %s: sending post-trigger SR_DF_LOGIC packet, ",
"start = %" PRIu64 ", length = %d", __func__,
(block * 4096) + trigger_point,
(4096 - 1) - trigger_point);
(block * BS) + trigger_point, (BS - 1) - trigger_point);
packet.type = SR_DF_LOGIC;
packet.length = (4096 - 1) - trigger_point;
packet.length = (BS - 1) - trigger_point;
packet.unitsize = 1;
packet.payload = la8->final_buf + (block * 4096)
+ trigger_point;
packet.payload = la8->final_buf + (block * BS) + trigger_point;
sr_session_bus(la8->session_id, &packet);
}
}
@ -976,15 +977,15 @@ static int receive_data(int fd, int revents, void *user_data)
return FALSE;
}
/* Get one block of data (4096 bytes). */
/* Get one block of data. */
if ((ret = la8_read_block(la8)) < 0) {
sr_err("la8: %s: la8_read_block error: %d", __func__, ret);
hw_stop_acquisition(sdi->index, user_data);
return FALSE;
}
/* We need to get exactly 2048 blocks (i.e. 8MB) of data. */
if (la8->block_counter != 2047) {
/* We need to get exactly NUM_BLOCKS blocks (i.e. 8MB) of data. */
if (la8->block_counter != (NUM_BLOCKS - 1)) {
la8->block_counter++;
return TRUE;
}
@ -992,7 +993,7 @@ static int receive_data(int fd, int revents, void *user_data)
sr_dbg("la8: sampling finished, sending data to session bus now");
/* All data was received and demangled, send it to the session bus. */
for (i = 0; i < 2048; i++)
for (i = 0; i < NUM_BLOCKS; i++)
send_block_to_session_bus(la8, i);
hw_stop_acquisition(sdi->index, user_data);