asix-sigma: Only change number of channels after successful firmware upload

[libsigrok.git] / src / hardware / asix-sigma / protocol.c

diff --git a/src/hardware/asix-sigma/protocol.c b/src/hardware/asix-sigma/protocol.c
index a81ec2f62f05344c877488ea1deeb9ebcc752cda..ee7ce02211e373dbc55f13d82ac3d50ca77deefc 100644 (file)
--- a/src/hardware/asix-sigma/protocol.c
+++ b/src/hardware/asix-sigma/protocol.c
@@ -554,6 +554,7 @@ SR_PRIV int sigma_set_samplerate(const struct sr_dev_inst *sdi, uint64_t sampler
        struct drv_context *drvc;
        size_t i;
        int ret;
+       int num_channels;
 
        devc = sdi->priv;
        drvc = sdi->driver->context;
@@ -572,15 +573,16 @@ SR_PRIV int sigma_set_samplerate(const struct sr_dev_inst *sdi, uint64_t sampler
         * firmware is required and higher rates might limit the set
         * of available channels.
         */
+       num_channels = devc->num_channels;
        if (samplerate <= SR_MHZ(50)) {
                ret = upload_firmware(drvc->sr_ctx, 0, devc);
-               devc->num_channels = 16;
+               num_channels = 16;
        } else if (samplerate == SR_MHZ(100)) {
                ret = upload_firmware(drvc->sr_ctx, 1, devc);
-               devc->num_channels = 8;
+               num_channels = 8;
        } else if (samplerate == SR_MHZ(200)) {
                ret = upload_firmware(drvc->sr_ctx, 2, devc);
-               devc->num_channels = 4;
+               num_channels = 4;
        }
 
        /*
@@ -589,6 +591,7 @@ SR_PRIV int sigma_set_samplerate(const struct sr_dev_inst *sdi, uint64_t sampler
         * an "event" (memory organization internal to the device).
         */
        if (ret == SR_OK) {
+               devc->num_channels = num_channels;
                devc->cur_samplerate = samplerate;
                devc->samples_per_event = 16 / devc->num_channels;
                devc->state.state = SIGMA_IDLE;