scpi-dmm: avoid get/set range calls for some of the Agilent DMM functions

[libsigrok.git] / src / hardware / scpi-dmm / protocol.c

diff --git a/src/hardware/scpi-dmm/protocol.c b/src/hardware/scpi-dmm/protocol.c
index 8c7b3373dc90f97143d1f473119e178dfae01e58..97a783fe387f4aec29157c5cb250beb08463b021 100644 (file)
--- a/src/hardware/scpi-dmm/protocol.c
+++ b/src/hardware/scpi-dmm/protocol.c
@@ -171,6 +171,8 @@ SR_PRIV const char *scpi_dmm_get_range_text(const struct sr_dev_inst *sdi)
                return NULL;
        if (!mqitem || !mqitem->scpi_func_setup)
                return NULL;
+       if (mqitem->drv_flags & FLAG_NO_RANGE)
+               return NULL;
 
        scpi_dmm_cmd_delay(sdi->conn);
        ret = sr_scpi_cmd(sdi, devc->cmdset, 0, NULL,
@@ -230,6 +232,8 @@ SR_PRIV int scpi_dmm_set_range_from_text(const struct sr_dev_inst *sdi,
                return ret;
        if (!item || !item->scpi_func_setup)
                return SR_ERR_ARG;
+       if (item->drv_flags & FLAG_NO_RANGE)
+               return SR_ERR_NA;
 
        is_auto = g_ascii_strcasecmp(range, "auto") == 0;
        scpi_dmm_cmd_delay(sdi->conn);