X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fhardware%2Fhp-3478a%2Fprotocol.c;h=7842f2f4e25992ca81a9d72e2f6d63a783274256;hb=4704f64551dd917c2616b4162e7e816fb57113da;hp=da200e7ab3fff629b804f52b8ead03d8e1bb7e51;hpb=e5137b9343563b27c8ba791360aa408264482153;p=libsigrok.git

diff --git a/src/hardware/hp-3478a/protocol.c b/src/hardware/hp-3478a/protocol.c
index da200e7a..7842f2f4 100644
--- a/src/hardware/hp-3478a/protocol.c
+++ b/src/hardware/hp-3478a/protocol.c
@@ -110,6 +110,24 @@ SR_PRIV int hp_3478a_set_range(const struct sr_dev_inst *sdi, int range_exp)
 	return hp_3478a_get_status_bytes(sdi);
 }
 
+SR_PRIV int hp_3478a_set_digits(const struct sr_dev_inst *sdi, uint8_t digits)
+{
+	int ret;
+	struct sr_scpi_dev_inst *scpi = sdi->conn;
+	struct dev_context *devc = sdi->priv;
+
+	/* No need to send command if we're not changing the range. */
+	if (devc->spec_digits == digits)
+		return SR_OK;
+
+	/* digits are based on devc->spec_digits, so we have to substract 1 */
+	ret = sr_scpi_send(scpi, "N%i", digits-1);
+	if (ret != SR_OK)
+		return ret;
+
+	return hp_3478a_get_status_bytes(sdi);
+}
+
 static int parse_range_vdc(struct dev_context *devc, uint8_t range_byte)
 {
 	if ((range_byte & SB1_RANGE_BLOCK) == RANGE_VDC_30MV) {
@@ -479,6 +497,10 @@ SR_PRIV int hp_3478a_receive_data(int fd, int revents, void *cb_data)
 	if (sr_scpi_get_double(scpi, NULL, &devc->measurement) != SR_OK)
 		return FALSE;
 
+	/* Check for overflow. */
+	if (devc->measurement >= 9.998e+9)
+		devc->measurement = INFINITY;
+
 	/*
 	 * This is necessary to get the actual range for the encoding digits.
 	 * Must be called after reading the value, because it resets the