sysclk-lwla: Use static array for LWLA1034 init sequence

[libsigrok.git] / src / hardware / sysclk-lwla / api.c

diff --git a/src/hardware/sysclk-lwla/api.c b/src/hardware/sysclk-lwla/api.c
index 891062560b0d5a09e86d5c24928a38dec6441ce3..20e30d1ecc9c2ba126b9da346987ecf2f8023e50 100644 (file)
--- a/src/hardware/sysclk-lwla/api.c
+++ b/src/hardware/sysclk-lwla/api.c
@@ -289,6 +289,7 @@ static int dev_open(struct sr_dev_inst *sdi)
        struct drv_context *drvc;
        struct dev_context *devc;
        struct sr_usb_dev_inst *usb;
+       int i;
        int ret;
 
        drvc = sdi->driver->context;
@@ -304,46 +305,57 @@ static int dev_open(struct sr_dev_inst *sdi)
                return SR_ERR;
        }
 
-       ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
-       if (ret != SR_OK)
-               return ret;
+       /* Try the whole shebang three times, fingers crossed. */
+       for (i = 0; i < 3; i++) {
+               ret = sr_usb_open(drvc->sr_ctx->libusb_ctx, usb);
+               if (ret != SR_OK)
+                       return ret;
 
-       ret = libusb_set_configuration(usb->devhdl, USB_CONFIG);
-       if (ret != LIBUSB_SUCCESS) {
-               sr_err("Failed to set USB configuration: %s.",
-                       libusb_error_name(ret));
-               sr_usb_close(usb);
-               return SR_ERR;
-       }
+               ret = libusb_set_configuration(usb->devhdl, USB_CONFIG);
+               if (ret != LIBUSB_SUCCESS) {
+                       sr_err("Failed to set USB configuration: %s.",
+                               libusb_error_name(ret));
+                       sr_usb_close(usb);
+                       return SR_ERR;
+               }
 
-       ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
-       if (ret != LIBUSB_SUCCESS) {
-               sr_err("Failed to claim interface: %s.",
-                       libusb_error_name(ret));
-               sr_usb_close(usb);
-               return SR_ERR;
-       }
+               ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE);
+               if (ret != LIBUSB_SUCCESS) {
+                       sr_err("Failed to claim interface: %s.",
+                               libusb_error_name(ret));
+                       sr_usb_close(usb);
+                       return SR_ERR;
+               }
 
-       ret = drain_usb(usb, EP_REPLY);
-       if (ret != SR_OK) {
-               sr_usb_close(usb);
-               return ret;
-       }
+               ret = drain_usb(usb, EP_REPLY);
+               if (ret != SR_OK) {
+                       sr_usb_close(usb);
+                       return ret;
+               }
+               /* This delay appears to be necessary for reliable operation. */
+               g_usleep(30 * 1000);
 
-       sdi->status = SR_ST_ACTIVE;
+               sdi->status = SR_ST_ACTIVE;
 
-       devc->active_fpga_config = FPGA_NOCONF;
-       devc->state = STATE_IDLE;
+               devc->active_fpga_config = FPGA_NOCONF;
+               devc->short_transfer_quirk = FALSE;
+               devc->state = STATE_IDLE;
 
-       ret = (*devc->model->apply_fpga_config)(sdi);
+               ret = (*devc->model->apply_fpga_config)(sdi);
 
-       if (ret == SR_OK)
-               ret = (*devc->model->device_init_check)(sdi);
+               if (ret == SR_OK)
+                       ret = (*devc->model->device_init_check)(sdi);
+               if (ret == SR_OK)
+                       break;
 
-       if (ret != SR_OK) {
+               /* Rinse and repeat. */
                sdi->status = SR_ST_INACTIVE;
                sr_usb_close(usb);
        }
+
+       if (ret == SR_OK && devc->short_transfer_quirk)
+               sr_warn("Short transfer quirk detected! "
+                       "Memory reads will be slow.");
        return ret;
 }