Rename 'ft2232h' driver to 'ftdi-la'.

[libsigrok.git] / src / hardware / ftdi-la / protocol.c

diff --git a/src/hardware/ftdi-la/protocol.c b/src/hardware/ftdi-la/protocol.c
new file mode 100644 (file)
index 0000000..0d71bcb
--- /dev/null
+++ b/src/hardware/ftdi-la/protocol.c
@@ -0,0 +1,87 @@
+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2015 Sergey Alirzaev <zl29ah@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <ftdi.h>
+#include "protocol.h"
+
+static void send_samples(struct dev_context *devc, uint64_t samples_to_send)
+{
+       struct sr_datafeed_packet packet;
+       struct sr_datafeed_logic logic;
+
+       sr_spew("Sending %" PRIu64 " samples.", samples_to_send);
+
+       packet.type = SR_DF_LOGIC;
+       packet.payload = &logic;
+       logic.length = samples_to_send;
+       logic.unitsize = 1;
+       logic.data = devc->data_buf;
+       sr_session_send(devc->cb_data, &packet);
+
+       devc->samples_sent += samples_to_send;
+       devc->bytes_received -= samples_to_send;
+}
+
+SR_PRIV int ftdi_la_receive_data(int fd, int revents, void *cb_data)
+{
+       struct sr_dev_inst *sdi;
+       struct dev_context *devc;
+       int bytes_read;
+       uint64_t n;
+
+       (void)fd;
+       (void)revents;
+
+       if (!(sdi = cb_data))
+               return TRUE;
+       if (!(devc = sdi->priv))
+               return TRUE;
+       if (!(revents == G_IO_IN || revents == 0))
+               return TRUE;
+       if (!devc->ftdic)
+               return TRUE;
+
+       /* Get a block of data. */
+       bytes_read = ftdi_read_data(devc->ftdic, devc->data_buf, DATA_BUF_SIZE);
+       if (bytes_read < 0) {
+               sr_err("Failed to read FTDI data (%d): %s.",
+                      bytes_read, ftdi_get_error_string(devc->ftdic));
+               sdi->driver->dev_acquisition_stop(sdi, sdi);
+               return FALSE;
+       }
+       if (bytes_read == 0) {
+               sr_spew("Received 0 bytes, nothing to do.");
+               return TRUE;
+       }
+       sr_spew("Got some data.");
+       devc->bytes_received += bytes_read;
+
+       n = devc->samples_sent + devc->bytes_received;
+
+       if (devc->limit_samples && (n >= devc->limit_samples)) {
+               send_samples(devc, devc->limit_samples - devc->samples_sent);
+               sr_info("Requested number of samples reached.");
+               sdi->driver->dev_acquisition_stop(sdi, cb_data);
+               return TRUE;
+       } else {
+               send_samples(devc, devc->bytes_received);
+       }
+
+       return TRUE;
+}