sysclk-lwla: Simplify and optimize word extraction.

[libsigrok.git] / hardware / sysclk-lwla / protocol.h

diff --git a/hardware/sysclk-lwla/protocol.h b/hardware/sysclk-lwla/protocol.h
index 29a191aab4b477b71e22a1513a00c3a2c0c16618..762a17b595c5d71fb4a67ceee9a1a350f899eec1 100644 (file)
--- a/hardware/sysclk-lwla/protocol.h
+++ b/hardware/sysclk-lwla/protocol.h
@@ -69,21 +69,21 @@
  */
 #define READ_CHUNK_LEN (28 * 8)
 
-/** Calculate the required buffer size in 16-bit units for reading a given
+/** Calculate the required buffer size in 32-bit units for reading a given
  * number of device memory words.  Rounded to a multiple of 8 device words.
  */
-#define LWLA1034_MEMBUF_LEN(count) (((count) + 7) / 8 * 18)
+#define LWLA1034_MEMBUF_LEN(count) (((count) + 7) / 8 * 9)
 
 /** Maximum number of 16-bit words sent at a time during acquisition.
  * Used for allocating the libusb transfer buffer.
  */
 #define MAX_ACQ_SEND_WORDS     8 /* 5 for memory read request plus stuffing */
 
-/** Maximum number of 16-bit words received at a time during acquisition.
+/** Maximum number of 32-bit words received at a time during acquisition.
  * Round to the next multiple of the endpoint buffer size to avoid nasty
  * transfer overflow conditions on hiccups.
  */
-#define MAX_ACQ_RECV_WORDS     ((READ_CHUNK_LEN / 4 * 9 + 255) / 256 * 256)
+#define MAX_ACQ_RECV_LEN       ((READ_CHUNK_LEN / 8 * 9 + 127) / 128 * 128)
 
 /** Maximum length of a register write sequence.
  */
@@ -174,9 +174,9 @@ struct acquisition_state {
        /** Whether to bypass the clock divider. */
        gboolean bypass_clockdiv;
 
-       /* Payload data buffers for outgoing and incoming transfers. */
+       /* Payload data buffers for incoming and outgoing transfers. */
+       uint32_t xfer_buf_in[MAX_ACQ_RECV_LEN];
        uint16_t xfer_buf_out[MAX_ACQ_SEND_WORDS];
-       uint16_t xfer_buf_in[MAX_ACQ_RECV_WORDS];
 
        /* Payload buffer for sigrok logic packets. */
        uint8_t out_packet[PACKET_LENGTH * UNIT_SIZE];