scpi: Add a function to read and wait on a *OPC? reply.

[libsigrok.git] / hardware / common / scpi.c

diff --git a/hardware/common/scpi.c b/hardware/common/scpi.c
index 03eea3eea747a6b1c16a7c99c4e6b923b6e1399e..b29e14ba61336514c0b40cbbe5daeeed1c9a7a8f 100644 (file)
--- a/hardware/common/scpi.c
+++ b/hardware/common/scpi.c
@@ -307,6 +307,31 @@ SR_PRIV int sr_scpi_get_double(struct sr_serial_dev_inst *serial,
        return ret;
 }
 
+/**
+ * Send a SCPI *OPC? command, read the reply and return the result of the
+ * command.
+ *
+ * @param serial Previously initialized serial port structure.
+ *
+ * @return SR_OK on success, SR_ERR on failure.
+ */
+SR_PRIV int sr_scpi_get_opc(struct sr_serial_dev_inst *serial)
+{
+       unsigned int i;
+       gboolean opc;
+
+       for (i = 0; i < SCPI_READ_RETRIES; ++i) {
+               sr_scpi_get_bool(serial, SCPI_CMD_OPC, &opc);
+
+               if (opc)
+                       return SR_OK;
+
+               g_usleep(SCPI_READ_RETRY_TIMEOUT);
+       }
+
+       return SR_ERR;
+}
+
 /**
  * Send the *IDN? SCPI command, receive the reply, parse it and store the
  * reply as a sr_scpi_hw_info structure in the supplied scpi_response pointer.