flash-ota: make it possible to reduce the payload-length with -l

diff --git a/flash-ota.c b/flash-ota.c
index 754cc29a8a3bb1f16d12ea6069f058a16640e517..50f20f66909dd45de5d4f860441b699747e16d38 100644 (file)
--- a/flash-ota.c
+++ b/flash-ota.c
@@ -43,13 +43,18 @@
 #include "culfw.h"
 #include "util.h"
 
-#define MAX_RETRIES    5
+#define MAX_RETRIES            5
+#define NORMAL_MAX_PAYLOAD     37
+#define LOWE_MAX_PAYLOAD       17
 
 extern char *optarg;
 
 uint32_t hmid = 0;
 uint32_t my_hmid = 0;
 
+/* Maximum payloadlen supported by IO */
+uint32_t max_payloadlen = NORMAL_MAX_PAYLOAD;
+
 enum device_type {
        DEVICE_TYPE_HMCFGUSB,
        DEVICE_TYPE_CULFW,
@@ -337,6 +342,7 @@ void flash_ota_syntax(char *prog)
        fprintf(stderr, "\nPossible options:\n");
        fprintf(stderr, "\t-c device\tenable CUL-mode with CUL at path \"device\"\n");
        fprintf(stderr, "\t-b bps\t\tuse CUL with speed \"bps\" (default: %u)\n", DEFAULT_CUL_BPS);
+       fprintf(stderr, "\t-l\t\tlower payloadlen (required for devices with little RAM, e.g. CUL v2 and CUL v4)\n");
        fprintf(stderr, "\t-h\t\tthis help\n");
 }
 
@@ -366,7 +372,7 @@ int main(int argc, char **argv)
 
        printf("HomeMatic OTA flasher version " VERSION "\n\n");
 
-       while((opt = getopt(argc, argv, "b:c:f:hs:")) != -1) {
+       while((opt = getopt(argc, argv, "b:c:f:hls:")) != -1) {
                switch (opt) {
                        case 'b':
                                bps = atoi(optarg);
@@ -377,6 +383,10 @@ int main(int argc, char **argv)
                        case 'f':
                                fw_file = optarg;
                                break;
+                       case 'l':
+                               printf("Reducing payload-len from %d to %d\n", max_payloadlen, LOWE_MAX_PAYLOAD);
+                               max_payloadlen = LOWE_MAX_PAYLOAD;
+                               break;
                        case 's':
                                serial = optarg;
                                break;
@@ -412,7 +422,7 @@ int main(int argc, char **argv)
                }
                dev.type = DEVICE_TYPE_CULFW;
 
-               printf("Requesting firmware-version\n");
+               printf("Requesting firmware version\n");
                culfw_send(dev.culfw, "\r\n", 2);
                culfw_flush(dev.culfw);
 
@@ -645,11 +655,11 @@ int main(int argc, char **argv)
                first = 1;
                cnt = 0;
                do {
-                       int payloadlen = 35;
+                       int payloadlen = max_payloadlen - 2;
                        int ack = 0;
 
                        if (first) {
-                               payloadlen = 37;
+                               payloadlen = max_payloadlen;
                                first = 0;
                        }