From 3109973fe239e60f4ec223ce95ef1609ea329e7c Mon Sep 17 00:00:00 2001
From: Fredrik Thulin <fredrik@thulin.net>
Date: Wed, 18 May 2016 14:44:01 +0200
Subject: A little more robust file transfer

---
 projects/cli-test/cli-test.c   |  8 ++++++--
 projects/cli-test/filetransfer | 21 +++++++++++++++++----
 2 files changed, 23 insertions(+), 6 deletions(-)

(limited to 'projects/cli-test')

diff --git a/projects/cli-test/cli-test.c b/projects/cli-test/cli-test.c
index 86e11ce..6102d32 100644
--- a/projects/cli-test/cli-test.c
+++ b/projects/cli-test/cli-test.c
@@ -62,20 +62,24 @@ int cmd_filetransfer(struct cli_def *cli, const char *command, char *argv[], int
     cli_print(cli, "OK, write file size (4 bytes), data in 4096 byte chunks, CRC-32 (4 bytes)");
 
     uart_receive_bytes(STM_UART_MGMT, (void *) &filesize, 4, 1000);
-    cli_print(cli, "Filesize %li", filesize);
+    cli_print(cli, "File size %li", filesize);
 
     while (filesize) {
 	if (filesize < n) {
 	    n = filesize;
 	}
 
-	uart_receive_bytes(STM_UART_MGMT, (void *) &buf, n, 1000);
+	if (uart_receive_bytes(STM_UART_MGMT, (void *) &buf, n, 1000) != HAL_OK) {
+	    cli_print(cli, "Receive timed out");
+	    return CLI_ERROR;
+	}
 	filesize -= n;
 	my_crc = update_crc(my_crc, buf, n);
 	counter++;
 	uart_send_bytes(STM_UART_MGMT, (void *) &counter, 4);
     }
 
+    cli_print(cli, "Send CRC-32");
     uart_receive_bytes(STM_UART_MGMT, (void *) &crc, 4, 1000);
     cli_print(cli, "CRC-32 %li", crc);
     if (crc == my_crc) {
diff --git a/projects/cli-test/filetransfer b/projects/cli-test/filetransfer
index 3e8e043..674a7f1 100755
--- a/projects/cli-test/filetransfer
+++ b/projects/cli-test/filetransfer
@@ -51,7 +51,7 @@ def send_file(filename, device='/dev/ttyUSB0', initiate=True):
     size = s.st_size
     src = open(filename, 'rb')
 
-    dst = serial.Serial(device, 921600, timeout=1)
+    dst = serial.Serial(device, 921600, timeout=0.1)
 
     if initiate:
         response = _execute(dst, 'filetransfer')
@@ -71,12 +71,25 @@ def send_file(filename, device='/dev/ttyUSB0', initiate=True):
             break
         dst.write(data)
         print("Wrote {!s} bytes".format(len(data)))
-        crc = crc32(data, crc) & 0xffffffff
-        new_counter = struct.unpack('<I', dst.read(4))[0]
+        # read ACK (a counter of number of 4k chunks received)
+        while True:
+            ack = dst.read(4)
+            if len(ack) == 4:
+                break
+            print('ERROR: Did not receive an ACK, got {!r}'.format(ack))
+            dst.write('\r')
+        new_counter = struct.unpack('<I', ack)[0]
         if new_counter != counter + 1:
-            print('ERROR: Did not receive the expected counter as ACK (got {!r}, not {!r})'.format(new_counter, counter))
+            print('ERROR: Did not receive the expected counter as ACK (got {!r}/{!r}, not {!r})'.format(new_counter, ack, counter))
+            flush = dst.read(100)
+            print('FLUSH data: {!r}'.format(flush))
             return False
         counter += 1
+
+        crc = crc32(data, crc) & 0xffffffff
+
+    _read(dst)
+
     # 3. Write CRC-32 (4 bytes)
     _write(dst, struct.pack('<I', crc))
     _read(dst)
-- 
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