hp-3478a: Add get/set/list of digits.

[libsigrok.git] / src / hardware / hp-3478a / protocol.c

diff --git a/src/hardware/hp-3478a/protocol.c b/src/hardware/hp-3478a/protocol.c
index da200e7ab3fff629b804f52b8ead03d8e1bb7e51..74acd144b0f1c77e0bf2de0a06f80fc4993dbb0a 100644 (file)
--- 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) {