analyzer: fix satellite behavior

artiq/firmware/runtime/analyzer.rs

@@ -1,4 +1,6 @@
 use io::{Write, Error as IoError};
+#[cfg(has_drtio)]
+use alloc::vec::Vec;
 use board_misoc::{csr, cache};
 use sched::{Io, Mutex, TcpListener, TcpStream, Error as SchedError};
 use analyzer_proto::*;
@@ -42,7 +44,6 @@ fn disarm() {
 pub mod remote_analyzer {
     use super::*;
     use rtio_mgt::drtio;
-    use alloc::vec::Vec;
     
     pub struct RemoteBuffer {
         pub total_byte_count: u64,

artiq/firmware/satman/analyzer.rs

@@ -1,3 +1,4 @@
+use core::cmp::min;
 use board_misoc::{csr, cache};
 use proto_artiq::drtioaux_proto::ANALYZER_MAX_SIZE;
 
@@ -35,8 +36,9 @@ fn disarm() {
 
 pub struct Analyzer {
     // necessary for keeping track of sent data
+    data_len: usize,
     sent_bytes: usize,
-    data_iter: usize
+    data_pointer: usize
 }
 
 pub struct Header {
@@ -50,48 +52,53 @@ pub struct AnalyzerSliceMeta {
     pub last: bool
 }
 
+impl Drop for Analyzer {
+    fn drop(&mut self) {
+        disarm();
+    }
+}
+
 impl Analyzer {
     pub fn new() -> Analyzer {
         // create and arm new Analyzer
         arm();
         Analyzer {
+            data_len: 0,
             sent_bytes: 0,
-            data_iter: 0
+            data_pointer: 0
         }
     }
 
-    fn drop(&mut self) {
-        disarm();
-    }
-
     pub fn get_header(&mut self) -> Header {
         disarm();
 
         let overflow = unsafe { csr::rtio_analyzer::message_encoder_overflow_read() != 0 };
         let total_byte_count = unsafe { csr::rtio_analyzer::dma_byte_count_read() };
         let wraparound = total_byte_count >= BUFFER_SIZE as u64;
-        self.sent_bytes = if wraparound { BUFFER_SIZE } else { total_byte_count as usize };
-        self.data_iter = if wraparound { (total_byte_count % BUFFER_SIZE as u64) as usize } else { 0 };
+        self.data_len = if wraparound { BUFFER_SIZE } else { total_byte_count as usize };
+        self.data_pointer = if wraparound { (total_byte_count % BUFFER_SIZE as u64) as usize } else { 0 };
+        self.sent_bytes = 0;
 
         Header {
             total_byte_count: total_byte_count,
-            sent_bytes: self.sent_bytes as u32,
+            sent_bytes: self.data_len as u32,
             overflow: overflow
         }
     }
 
     pub fn get_data(&mut self, data_slice: &mut [u8; ANALYZER_MAX_SIZE]) -> AnalyzerSliceMeta {
         let data = unsafe { &BUFFER.data[..] };
-        let i = self.data_iter;
-        let len = if i + ANALYZER_MAX_SIZE < self.sent_bytes { ANALYZER_MAX_SIZE } else { self.sent_bytes - i };
-        let last = i + len == self.sent_bytes;
+        let i = (self.data_pointer + self.sent_bytes) % BUFFER_SIZE;
+        let len = min(ANALYZER_MAX_SIZE, self.data_len - self.sent_bytes);
+        let last = self.sent_bytes + len == self.data_len;
+
         if i + len >= BUFFER_SIZE {
-            data_slice[..len].clone_from_slice(&data[i..BUFFER_SIZE]);
-            data_slice[..len].clone_from_slice(&data[..(i+len) % BUFFER_SIZE]);
+            data_slice[..(BUFFER_SIZE-i)].clone_from_slice(&data[i..BUFFER_SIZE]);
+            data_slice[(BUFFER_SIZE-i)..len].clone_from_slice(&data[..(i + len) % BUFFER_SIZE]);
         } else {
             data_slice[..len].clone_from_slice(&data[i..i+len]);
         }
-        self.data_iter += len;
+        self.sent_bytes += len;
 
         if last {
             arm();