// is the order in which they go out on the wire.\r
 //=============================================================================\r
 \r
-BYTE ToSend[256];\r
+BYTE ToSend[512];\r
 int ToSendMax;\r
 static int ToSendBit;\r
 struct common_area common_area __attribute__((section(".commonarea")));\r
 void BufferClear(void)\r
 {\r
        memset(BigBuf,0,sizeof(BigBuf));\r
-       DbpString("Buffer cleared");\r
+       Dbprintf("Buffer cleared (%i bytes)",sizeof(BigBuf));\r
 }\r
 \r
 void ToSendReset(void)\r
        UsbCommand c;\r
        c.cmd = CMD_DEBUG_PRINT_STRING;\r
        c.arg[0] = strlen(str);\r
+       if(c.arg[0] > sizeof(c.d.asBytes)) {\r
+               c.arg[0] = sizeof(c.d.asBytes);\r
+       }\r
        memcpy(c.d.asBytes, str, c.arg[0]);\r
 \r
        UsbSendPacket((BYTE *)&c, sizeof(c));\r
 {\r
        int vHf = 0;    // in mV\r
 \r
-       DbpString("Measuring HF antenna characteristics, press button to exit");\r
+       DbpString("Measuring HF antenna, press button to exit");\r
 \r
        for (;;) {\r
                // Let the FPGA drive the high-frequency antenna around 13.56 MHz.\r
 \r
 void ReadMem(int addr)\r
 {\r
-       const DWORD *data = ((DWORD *)addr);\r
+       const BYTE *data = ((BYTE *)addr);\r
 \r
        Dbprintf("%x: %02x %02x %02x %02x %02x %02x %02x %02x",\r
                addr, data[0], data[1], data[2], data[3], data[4], data[5], data[6], data[7]);\r
                }\r
 \r
                case CMD_DOWNLOADED_SIM_SAMPLES_125K: {\r
+                       UsbCommand ack;\r
                        BYTE *b = (BYTE *)BigBuf;\r
                        memcpy(b+c->arg[0], c->d.asBytes, 48);\r
+                       //Dbprintf("copied 48 bytes to %i",b+c->arg[0]);\r
+                       ack.cmd = CMD_ACK;\r
+                       UsbSendPacket((BYTE*)&ack, sizeof(ack));\r
                        break;\r
                }\r
 \r
 #ifdef WITH_LF\r
                case CMD_SIMULATE_TAG_125K:\r
                        LED_A_ON();\r
-                       SimulateTagLowFrequency(c->arg[0], 1);\r
+                       SimulateTagLowFrequency(c->arg[0], c->arg[1], 1);\r
                        LED_A_OFF();\r
                        break;\r
 #endif\r
                }\r
                        break;\r
                default:\r
-                       DbpString("unknown command");\r
+                       Dbprintf("%s: 0x%04x","unknown command:",c->cmd);\r
                        break;\r
        }\r
 }\r