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scpi_usbtmc: Improve debugging output.

This commit is contained in:
Martin Ling 2014-01-22 04:48:33 +00:00 committed by Bert Vermeulen
parent 569d4dbd3e
commit a849c43a50
1 changed files with 16 additions and 6 deletions
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22
hardware/common/scpi_usbtmc.c
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@ -119,6 +119,8 @@ static int scpi_usbtmc_read_begin(void *priv)
uscpi->response_length = len;
uscpi->response_bytes_read = 0;
sr_spew("Read %d bytes from device into buffer", len);
return SR_OK;
}
@ -127,13 +129,18 @@ static int scpi_usbtmc_read_data(void *priv, char *buf, int maxlen)
struct usbtmc_scpi *uscpi = priv;
int read_length;
if (uscpi->response_length == MAX_READ_LENGTH
&& uscpi->response_bytes_read == uscpi->response_length)
if (scpi_usbtmc_read_begin(uscpi) != SR_OK)
return SR_ERR;
sr_spew("%d bytes requested", maxlen);
if (uscpi->response_bytes_read >= uscpi->response_length)
return SR_ERR;
if (uscpi->response_bytes_read == uscpi->response_length) {
sr_spew("Buffer is empty.");
if (uscpi->response_length == MAX_READ_LENGTH) {
sr_spew("Previous read was of maximum length, reading again.");
if (scpi_usbtmc_read_begin(uscpi) != SR_OK)
return SR_ERR;
} else {
return SR_ERR;
}
}
read_length = uscpi->response_length - uscpi->response_bytes_read;
@ -144,6 +151,9 @@ static int scpi_usbtmc_read_data(void *priv, char *buf, int maxlen)
uscpi->response_bytes_read += read_length;
sr_spew("Returned %d bytes from buffer, %d/%d bytes of buffer now read",
read_length, uscpi->response_bytes_read, uscpi->response_length);
return read_length;
}