serial-dmm: Implement request timeout mechanism.

[libsigrok.git] / hardware / serial-dmm / protocol.h

diff --git a/hardware/serial-dmm/protocol.h b/hardware/serial-dmm/protocol.h
index f96e43da77ff4d7130bb40ba31e4876a7bb3701b..fb5a2a336d99e88fc11c8d618dfb144b3acfb0b5 100644 (file)
--- a/hardware/serial-dmm/protocol.h
+++ b/hardware/serial-dmm/protocol.h
@@ -69,6 +69,12 @@ struct dmm_info {
        uint32_t baudrate;
        /** Packet size in bytes. */
        int packet_size;
+       /** Request timeout [ms] before request is considered lost and a new
+        *  one is sent. Used only if device needs polling. */
+       int64_t req_timeout_ms;
+       /** Delay between reception of packet and next request. Some DMMs
+        *  need this. Used only if device needs polling. */
+       int64_t req_delay_ms;
        /** Packet request function. */
        int (*packet_request)(struct sr_serial_dev_inst *);
        /** Packet validation function. */
@@ -102,13 +108,20 @@ struct dev_context {
        /** The current number of already received samples. */
        uint64_t num_samples;
 
+       /** The starting time of current sampling run. */
        int64_t starttime;
 
        uint8_t buf[DMM_BUFSIZE];
        int bufoffset;
        int buflen;
+
+       /** The timestamp [µs] to send the next request.
+        *  Used only if device needs polling. */
+       int64_t req_next_at;
 };
 
+SR_PRIV int req_packet(struct sr_dev_inst *sdi, int dmm);
+
 SR_PRIV int receive_data_BBCGM_M2110(int fd, int revents, void *cb_data);
 SR_PRIV int receive_data_DIGITEK_DT4000ZC(int fd, int revents, void *cb_data);
 SR_PRIV int receive_data_TEKPOWER_TP4000ZC(int fd, int revents, void *cb_data);