#include "util.h"
#include "cmdscript.h"
+
unsigned int current_command = CMD_UNKNOWN;
-unsigned int received_command = CMD_UNKNOWN;
-UsbCommand current_response;
-UsbCommand current_response_user;
+//unsigned int received_command = CMD_UNKNOWN;
+//UsbCommand current_response;
+//UsbCommand current_response_user;
static int CmdHelp(const char *Cmd);
static int CmdQuit(const char *Cmd);
+//For storing command that are received from the device
+#define CMD_BUFFER_SIZE 50
+static UsbCommand cmdBuffer[CMD_BUFFER_SIZE];
+//Points to the next empty position to write to
+static int cmd_head;//Starts as 0
+//Points to the position of the last unread command
+static int cmd_tail;//Starts as 0
+
static command_t CommandTable[] =
{
{"help", CmdHelp, 1, "This help. Use '<command> help' for details of the following commands:\n"},
exit(0);
return 0;
}
+/**
+ * @brief This method should be called when sending a new command to the pm3. In case any old
+ * responses from previous commands are stored in the buffer, a call to this method should clear them.
+ * A better method could have been to have explicit command-ACKS, so we can know which ACK goes to which
+ * operation. Right now we'll just have to live with this.
+ */
+void clearCommandBuffer()
+{
+ //This is a very simple operation
+ cmd_tail = cmd_head;
+}
-bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeout) {
+/**
+ * @brief storeCommand stores a USB command in a circular buffer
+ * @param UC
+ */
+void storeCommand(UsbCommand *command)
+{
+ if( ( cmd_head+1) % CMD_BUFFER_SIZE == cmd_tail)
+ {
+ //If these two are equal, we're about to overwrite in the
+ // circular buffer.
+ PrintAndLog("WARNING: Command buffer about to overwrite command! This needs to be fixed!");
+ }
+ //Store the command at the 'head' location
+ UsbCommand* destination = &cmdBuffer[cmd_head];
+ memcpy(destination, command, sizeof(UsbCommand));
- // Wait until the command is received
- for(size_t i=0; received_command != cmd && i < ms_timeout/10; i++) {
- msleep(10); // XXX ugh
- if (i == 200) { // Two seconds elapsed
- PrintAndLog("Waiting for a response from the proxmark...");
- PrintAndLog("Don't forget to cancel its operation first by pressing on the button");
+ cmd_head = (cmd_head +1) % CMD_BUFFER_SIZE; //increment head and wrap
+
+}
+/**
+ * @brief getCommand gets a command from an internal circular buffer.
+ * @param response location to write command
+ * @return 1 if response was returned, 0 if nothing has been received
+ */
+int getCommand(UsbCommand* response)
+{
+ //If head == tail, there's nothing to read, or if we just got initialized
+ if(cmd_head == cmd_tail){
+ return 0;
}
- }
-
- // Check if timeout occured
- if(received_command != cmd) return false;
+ //Pick out the next unread command
+ UsbCommand* last_unread = &cmdBuffer[cmd_tail];
+ memcpy(response, last_unread, sizeof(UsbCommand));
+ //Increment tail - this is a circular buffer, so modulo buffer size
+ cmd_tail = (cmd_tail +1 ) % CMD_BUFFER_SIZE;
+
+ return 1;
+
+}
- // Copy the received response (if supplied)
- if (response) {
- memcpy(response, ¤t_response, sizeof(UsbCommand));
+/**
+ * Waits for a certain response type. This method waits for a maximum of
+ * ms_timeout milliseconds for a specified response command.
+ *@brief WaitForResponseTimeout
+ * @param cmd command to wait for
+ * @param response struct to copy received command into.
+ * @param ms_timeout
+ * @return true if command was returned, otherwise false
+ */
+bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeout) {
+
+ if (response == NULL) {
+ UsbCommand resp;
+ response = &resp;
}
- // Reset the received command
- received_command = CMD_UNKNOWN;
+ // Wait until the command is received
+ for(size_t dm_seconds=0; dm_seconds < ms_timeout/10; dm_seconds++) {
+
+ while(getCommand(response))
+ {
+ if(response->cmd == cmd){
+ //We got what we expected
+ return true;
+ }
- return true;
+ }
+ msleep(10); // XXX ugh
+ if (dm_seconds == 200) { // Two seconds elapsed
+ PrintAndLog("Waiting for a response from the proxmark...");
+ PrintAndLog("Don't forget to cancel its operation first by pressing on the button");
+ }
+ }
+ return false;
}
bool WaitForResponse(uint32_t cmd, UsbCommand* response) {
default: {
// Maybe it's a response
+ /*
switch(current_command) {
case CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K: {
if (UC->cmd != CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K) {
memcpy(sample_buf+UC->arg[0],UC->d.asBytes,48);
sample_buf_len += 48;
// for(i=0; i<48; i++) sample_buf[i] = UC->d.asBytes[i];
- received_command = UC->cmd;
+ //received_command = UC->cmd;
} break;
default: {
} break;
- }
-// // Store the last received command
-// memcpy(¤t_response, UC, sizeof(UsbCommand));
-// received_command = UC->cmd;
- } break;
- }
- // Store the last received command
- memcpy(¤t_response, UC, sizeof(UsbCommand));
- received_command = UC->cmd;
-/*
- // Maybe it's a response:
- switch(current_command) {
- case CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K:
- if (UC->cmd != CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K) goto unexpected_response;
- int i;
- for(i=0; i<48; i++) sample_buf[i] = UC->d.asBytes[i];
- received_command = UC->cmd;
- return;
- case CMD_ACQUIRE_RAW_ADC_SAMPLES_125K:
- case CMD_DOWNLOADED_SIM_SAMPLES_125K:
- if (UC->cmd != CMD_ACK) goto unexpected_response;
- // got ACK
- received_command = UC->cmd;
- return;
- default:
- unexpected_response:
-
- if(UC->cmd != CMD_ACK)
- PrintAndLog("unrecognized command %08x \n", UC->cmd);
- else
- memcpy(¤t_response, UC, sizeof(UsbCommand));
- received_command = UC->cmd;
+ }*/
+ }
+ break;
}
- */
+
+ storeCommand(UC);
+
}
+
projects / proxmark3-svn / blobdiff