Vsevolod,
Glad to see you found a way to fix the problem!
However, I'm not really sure whether it's the right solution. You are calling the cressi_leonardo_transfer_prepare() function from inside the cressi_leonardo_packet() function. That means you're doing this for every single packet! But if the problem is only during the initial setup of the connection, then that's probably overkill. Note that due to the 300ms sleep in that function, there is also a serious impact on the performance. So you are probably correct that the setup phase needs some tweaking, but I doubt this is necessary for every single packet.
I went back to have a look at some of the capture files I have, and the Cressi application doesn't seem to change DTR or RTS between packets. But it does this sequence at startup:
CREATE Options: Open GET_BAUD_RATE GET_LINE_CONTROL GET_CHARS GET_HANDFLOW SET_BAUD_RATE Rate: 9600 SET_RTS SET_DTR SET_LINE_CONTROL StopBits: 1 Parity: NONE WordLength: 8 SET_CHAR EOF:0 ERR:0 BRK:0 EVT:0 XON:11 XOFF:13 SET_HANDFLOW Shake:1 Replace:40 XonLimit:64 XoffLimit:64 SET_QUEUE_SIZE InSize: 640 OutSize: 640 SET_TIMEOUTS RI:-1 RM:0 RC:0 WM:0 WC:500 SET_RTS SET_DTR GET_BAUD_RATE GET_LINE_CONTROL GET_CHARS GET_HANDFLOW SET_BAUD_RATE Rate: 115200 SET_RTS SET_DTR SET_LINE_CONTROL StopBits: 1 Parity: NONE WordLength: 8 SET_CHAR EOF:0 ERR:0 BRK:0 EVT:0 XON:11 XOFF:13 SET_HANDFLOW Shake:1 Replace:40 XonLimit:64 XoffLimit:64 GET_BAUD_RATE GET_LINE_CONTROL GET_CHARS GET_HANDFLOW SET_QUEUE_SIZE InSize: 640 OutSize: 640 SET_TIMEOUTS RI:-1 RM:0 RC:0 WM:0 WC:500 GET_BAUD_RATE GET_LINE_CONTROL GET_CHARS GET_HANDFLOW SET_BAUD_RATE Rate: 115200 SET_RTS SET_DTR SET_LINE_CONTROL StopBits: 1 Parity: NONE WordLength: 8 SET_CHAR EOF:0 ERR:0 BRK:0 EVT:0 XON:11 XOFF:13 SET_HANDFLOW Shake:1 Replace:40 XonLimit:64 XoffLimit:64 GET_BAUD_RATE GET_LINE_CONTROL GET_CHARS GET_HANDFLOW SET_QUEUE_SIZE InSize: 640 OutSize: 640 SET_TIMEOUTS RI:-1 RM:0 RC:0 WM:0 WC:500 CLR_DTR SET_DTR CLR_DTR WRITE 7B 31 30 30 30 30 30 31 33 39 33 30 36 7D FLUSH_BUFFERS SET_TIMEOUTS RI:-1 RM:0 RC:10000 WM:0 WC:500 READ 7B 30 31 43 30 32 36 30 30 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 30 31 30 35 30 31 43 41 39 31 7D
So it first sets DTR and RTS:
SET_RTS SET_DTR
(The fact that this happens a few times is probably due to use of some serial port package that doesn't change all settings at once. The libdivecomputer configure function does this with just one call.)
And then before sending the first command it toggles DTR:
CLR_DTR SET_DTR CLR_DTR
And that might be the key to the solution, because libdivecomputer only does this:
SET_RTS SET_DTR
CLR_DTR
So an extra SET_DTR and CLR_DTR at startup, with the right amount of delays in between, might already be sufficient.
There is also a difference in behavior in this area between the windows and linux serial port code. Those initial SET_RTS and SET_DTR are there, because the windows api automatically sets or clears RTS and DTR when configuring the serial lines settings (based on the dcb.fDtrControl and dcb.fRtsControl settings). But on linux, the DTR/RTS lines are left alone, and you need to control them manually. That might explain why everything works on windows, but not on linux.
So I think we need to do the following sequence:
SET_RTS SET_DTR <- This can probably be omitted, but it makes sure windows and linux behave the same CLR_DTR SET_DTR CLR_DTR
RTS only needs to be set once, but the dive computer probably reacts to the DTR toggling, so that's the part that matters I think. And we need some delays in between to make sure it doesn't happen too fast. When I reverse engineered this, I just looked at the final value for DTR (plus the initial set to get the same result on windows and linux), but now I think it's the toggling that does the trick.
So in libdivecomputer calls that would translate to the following sequence. First initialize the serial port settings, making sure windows and linux are the same:
dc_serial_configure (device->port, 115200, 8, DC_PARITY_NONE, DC_STOPBITS_ONE, DC_FLOWCONTROL_NONE) dc_serial_set_timeout (device->port, 1000); dc_serial_set_rts (device->port, 1); dc_serial_set_dtr (device->port, 1);
Then discard garbage data as usual:
dc_serial_sleep (device->port, 100); dc_serial_purge (device->port, DC_DIRECTION_ALL);
And finally toggle the DTR line:
dc_serial_set_dtr (device->port, 0); dc_serial_sleep (device->port, SOMEDELAY); dc_serial_set_dtr (device->port, 1); dc_serial_sleep (device->port, SOMEDELAY); dc_serial_set_dtr (device->port, 0);
I only don't know how long the delays should be, because I have no timing info in the capture file.
Does that make sense?
Jef
On 2017-10-01 13:38, Vsevolod Velichko wrote:
Cressi Leonardo computers behave extremely unreliable if the dump is requested right after the connection establishment. The computer mostly sends nothing or sends garbage, so official Cressi software uses request of small device memory part as a ping until device become stable. And DTR flag should be reset before each request, or device wouldn't send any data in response.
This patch fixes https://github.com/Subsurface-divelog/subsurface/issues/391 and probably all previous mentions of Leonardo problems.
Signed-off-by: Vsevolod Velichko torkvemada@sorokdva.net
src/cressi_leonardo.c | 133 +++++++++++++++++++++++++++++++++----------------- 1 file changed, 89 insertions(+), 44 deletions(-)
diff --git a/src/cressi_leonardo.c b/src/cressi_leonardo.c index f21a223..14db35f 100644 --- a/src/cressi_leonardo.c +++ b/src/cressi_leonardo.c @@ -44,7 +44,10 @@ #define RB_PROFILE_END SZ_MEMORY #define RB_PROFILE_DISTANCE(a,b) ringbuffer_distance (a, b, 0, RB_PROFILE_BEGIN, RB_PROFILE_END)
-#define MAXRETRIES 4 +#define PING_ADDRESS 0x1000 +#define PING_LENGTH 19
+#define MAXRETRIES 20 #define PACKETSIZE 32
typedef struct cressi_leonardo_device_t { @@ -74,6 +77,9 @@ static const dc_device_vtable_t cressi_leonardo_device_vtable = { static dc_status_t cressi_leonardo_extract_dives (dc_device_t *abstract, const unsigned char data[], unsigned int size, dc_dive_callback_t callback, void *userdata);
+static dc_status_t +cressi_leonardo_transfer_prepare (cressi_leonardo_device_t *device, dc_context_t *context);
static void cressi_leonardo_make_ascii (const unsigned char raw[], unsigned int rsize, unsigned char ascii[], unsigned int asize) { @@ -105,6 +111,13 @@ cressi_leonardo_packet (cressi_leonardo_device_t *device, const unsigned char co if (device_is_cancelled (abstract)) return DC_STATUS_CANCELLED;
- // Prepare device for writing.
- status = cressi_leonardo_transfer_prepare (device,
abstract->context);
- if (status != DC_STATUS_SUCCESS) {
ERROR (abstract->context, "Failed to prepare device for transfer.");return status;- }
- // Send the command to the device. status = dc_serial_write (device->port, command, csize, NULL); if (status != DC_STATUS_SUCCESS) {
@@ -141,6 +154,37 @@ cressi_leonardo_packet (cressi_leonardo_device_t *device, const unsigned char co }
static dc_status_t +cressi_leonardo_transfer_prepare (cressi_leonardo_device_t *device, dc_context_t *context) +{
- // Set the RTS line.
- dc_status_t status = dc_serial_set_rts (device->port, 1);
- if (status != DC_STATUS_SUCCESS) {
ERROR (context, "Failed to set the RTS line.");return status;- }
- // Set the DTR line.
- status = dc_serial_set_dtr (device->port, 1);
- if (status != DC_STATUS_SUCCESS) {
ERROR (context, "Failed to set the DTR line.");return status;- }
- dc_serial_sleep (device->port, 200);
- // Clear the DTR line.
- status = dc_serial_set_dtr (device->port, 0);
- if (status != DC_STATUS_SUCCESS) {
ERROR (context, "Failed to clear the DTR line.");return status;- }
- dc_serial_sleep (device->port, 100);
- dc_serial_purge (device->port, DC_DIRECTION_ALL);
- return status;
+}
+static dc_status_t cressi_leonardo_transfer (cressi_leonardo_device_t *device, const unsigned char command[], unsigned int csize, unsigned char answer[], unsigned int asize) { unsigned int nretries = 0; @@ -197,39 +241,13 @@ cressi_leonardo_device_open (dc_device_t **out, dc_context_t *context, const cha goto error_close; }
- // Set the timeout for receiving data (1000 ms).
- status = dc_serial_set_timeout (device->port, 1000);
- // Set the timeout for receiving data (3000 ms).
- status = dc_serial_set_timeout (device->port, 3000); if (status != DC_STATUS_SUCCESS) { ERROR (context, "Failed to set the timeout."); goto error_close; }
// Set the RTS line.
status = dc_serial_set_rts (device->port, 1);
if (status != DC_STATUS_SUCCESS) {
ERROR (context, "Failed to set the RTS line.");goto error_close;}
// Set the DTR line.
status = dc_serial_set_dtr (device->port, 1);
if (status != DC_STATUS_SUCCESS) {
ERROR (context, "Failed to set the DTR line.");goto error_close;}
dc_serial_sleep (device->port, 200);
// Clear the DTR line.
status = dc_serial_set_dtr (device->port, 0);
if (status != DC_STATUS_SUCCESS) {
ERROR (context, "Failed to clear the DTR line.");goto error_close;}
dc_serial_sleep (device->port, 100);
dc_serial_purge (device->port, DC_DIRECTION_ALL);
*out = (dc_device_t *) device;
return DC_STATUS_SUCCESS;
@@ -332,29 +350,56 @@ cressi_leonardo_device_dump (dc_device_t *abstract, dc_buffer_t *buffer) progress.maximum = SZ_MEMORY; device_event_emit (abstract, DC_EVENT_PROGRESS, &progress);
- // Send the command header to the dive computer.
- const unsigned char command[] = {0x7B, 0x31, 0x32, 0x33, 0x44, 0x42,
0x41, 0x7d};
- status = dc_serial_write (device->port, command, sizeof (command),
NULL);
- if (status != DC_STATUS_SUCCESS) {
ERROR (abstract->context, "Failed to send the command.");return status;
- for (int attempt = 0; attempt < MAXRETRIES; ++attempt) {
// Send the ping command to the dive computer.unsigned char tmp[PING_LENGTH] = {0};status = cressi_leonardo_device_read(abstract, PING_ADDRESS, tmp,sizeof(tmp));
if (status == DC_STATUS_SUCCESS)break;
- // Receive the header packet.
- unsigned char header[7] = {0};
- status = dc_serial_read (device->port, header, sizeof (header),
NULL); if (status != DC_STATUS_SUCCESS) {
ERROR (abstract->context, "Failed to receive the answer.");
ERROR (abstract->context, "Failed to ping device.");
- // Verify the header packet.
- const unsigned char expected[] = {0x7B, 0x21, 0x44, 0x35, 0x42, 0x33,
0x7d};
- if (memcmp (header, expected, sizeof (expected)) != 0) {
ERROR (abstract->context, "Unexpected answer byte.");return DC_STATUS_PROTOCOL;
- for (int attempt = 0; attempt < MAXRETRIES; ++attempt) {
status = cressi_leonardo_transfer_prepare (device,abstract->context);
if (status != DC_STATUS_SUCCESS) {ERROR (abstract->context, "Failed to prepare device fortransfer.");
continue;}// Send the command header to the dive computer.const unsigned char command[] = {0x7B, 0x31, 0x32, 0x33, 0x44,0x42, 0x41, 0x7d};
status = dc_serial_write (device->port, command, sizeof (command),NULL);
if (status != DC_STATUS_SUCCESS) {ERROR (abstract->context, "Failed to send the command.");continue;}// Receive the header packet.unsigned char header[7] = {0};status = dc_serial_read (device->port, header, sizeof (header),NULL);
if (status != DC_STATUS_SUCCESS) {ERROR (abstract->context, "Failed to receive the answer.");continue;}// Verify the header packet.const unsigned char expected[] = {0x7B, 0x21, 0x44, 0x35, 0x42,0x33, 0x7d};
if (memcmp (header, expected, sizeof (expected)) != 0) {ERROR (abstract->context, "Unexpected answer byte.");status = DC_STATUS_PROTOCOL;continue;}break;}
if (status != DC_STATUS_SUCCESS)
return status;unsigned char *data = dc_buffer_get_data (buffer);
unsigned int nbytes = 0;