X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/e16054a468a615abb805322b085e365caadf3196..d7d12fab4b8d1fc1e0c78af682ee50606e84bfbe:/armsrc/pcf7931.c

diff --git a/armsrc/pcf7931.c b/armsrc/pcf7931.c
index 0dba4fe3..df8b1a96 100644
--- a/armsrc/pcf7931.c
+++ b/armsrc/pcf7931.c
@@ -1,15 +1,8 @@
-#include "proxmark3.h"
-#include "apps.h"
-#include "lfsampling.h"
 #include "pcf7931.h"
-#include "string.h"
 
 #define T0_PCF 8 //period for the pcf7931 in us
 #define ALLOC 16
 
-#define abs(x) ( ((x)<0) ? -(x) : (x) )
-#define max(x,y) ( x<y ? y:x)
-
 int DemodPCF7931(uint8_t **outBlocks) {
 
     uint8_t bits[256] = {0x00};
@@ -19,8 +12,7 @@ int DemodPCF7931(uint8_t **outBlocks) {
 	int GraphTraceLen = BigBuf_max_traceLen();
 	if (  GraphTraceLen > 18000 )
 		GraphTraceLen = 18000;
-	
-	
+		
 	int i, j, lastval, bitidx, half_switch;
 	int clock = 64;
 	int tolerance = clock / 8;
@@ -29,6 +21,8 @@ int DemodPCF7931(uint8_t **outBlocks) {
 	int num_blocks = 0;
 	int lmin=128, lmax=128;
 	uint8_t dir;
+	//clear read buffer
+	BigBuf_Clear_keep_EM();
 
 	LFSetupFPGAForADC(95, true);
 	DoAcquisition_default(0, true);
@@ -70,7 +64,7 @@ int DemodPCF7931(uint8_t **outBlocks) {
 
 			// Switch depending on lc length:
 			// Tolerance is 1/8 of clock rate (arbitrary)
-			if (abs(lc-clock/4) < tolerance) {
+			if (ABS(lc-clock/4) < tolerance) {
 				// 16T0
 				if((i - pmc) == lc) { /* 16T0 was previous one */
 					/* It's a PMC ! */
@@ -82,7 +76,7 @@ int DemodPCF7931(uint8_t **outBlocks) {
 				else {
 					pmc = i;
 				}
-			} else if (abs(lc-clock/2) < tolerance) {
+			} else if (ABS(lc-clock/2) < tolerance) {
 				// 32TO
 				if((i - pmc) == lc) { /* 16T0 was previous one */
 					/* It's a PMC ! */
@@ -97,7 +91,7 @@ int DemodPCF7931(uint8_t **outBlocks) {
 				}
 				else
 					half_switch++;
-			} else if (abs(lc-clock) < tolerance) {
+			} else if (ABS(lc-clock) < tolerance) {
 				// 64TO
                 bits[bitidx++] = 1;
 			} else {
@@ -152,10 +146,12 @@ int IsBlock0PCF7931(uint8_t *Block) {
 
 int IsBlock1PCF7931(uint8_t *Block) {
 	// Assume RFU means 0 :)
-	if(Block[10] == 0 && Block[11] == 0 && Block[12] == 0 && Block[13] == 0)
-		if((Block[14] & 0x7f) <= 9 && Block[15] <= 9)
+	if( Block[10] == 0 && 
+	    Block[11] == 0 && 
+		Block[12] == 0 && 
+		Block[13] == 0)
+		 if ( (Block[14] & 0x7f) <= 9 && Block[15] <= 9)
 			return 1;
-
 	return 0;
 }
 
@@ -202,7 +198,7 @@ void ReadPCF7931() {
 						Blocks[0][ALLOC] = 1;
 						memcpy(Blocks[1], tmpBlocks[i+1], 16);
 						Blocks[1][ALLOC] = 1;
-						max_blocks = max((Blocks[1][14] & 0x7f), Blocks[1][15]) + 1;
+						max_blocks = MAX((Blocks[1][14] & 0x7f), Blocks[1][15]) + 1;
 						// Debug print
 						Dbprintf("(dbg) Max blocks: %d", max_blocks);
 						num_blocks = 2;
@@ -279,8 +275,7 @@ void ReadPCF7931() {
  */
 void WritePCF7931(uint8_t pass1, uint8_t pass2, uint8_t pass3, uint8_t pass4, uint8_t pass5, uint8_t pass6, uint8_t pass7, uint16_t init_delay, int32_t l, int32_t p, uint8_t address, uint8_t byte, uint8_t data)
 {
-
-	uint32_t tab[1024]={0}; // data times frame
+	uint32_t tab[1024] = {0}; // data times frame
 	uint32_t u = 0;
 	uint8_t parity = 0;
 	bool comp = 0;
@@ -299,7 +294,6 @@ void WritePCF7931(uint8_t pass1, uint8_t pass2, uint8_t pass3, uint8_t pass4, ui
 	//password indication bit
 	AddBitPCF7931(1, tab, l, p);
 
-
 	//password (on 56 bits)
 	Dbprintf("Password (LSB first on each byte) : %02x %02x %02x %02x %02x %02x %02x", pass1,pass2,pass3,pass4,pass5,pass6,pass7);
 	AddBytePCF7931(pass1, tab, l, p);
@@ -366,8 +360,7 @@ void WritePCF7931(uint8_t pass1, uint8_t pass2, uint8_t pass3, uint8_t pass4, ui
 		tab[u]=(tab[u] * 3)/2;
 	}
 
-
-	//compennsation of the counter reload
+	//compensation of the counter reload
 	while (!comp){
 		comp = 1;
 		for(u=0;tab[u]!=0;u++){
@@ -388,10 +381,9 @@ void WritePCF7931(uint8_t pass1, uint8_t pass2, uint8_t pass3, uint8_t pass4, ui
  */
 
 void SendCmdPCF7931(uint32_t * tab){
-	uint16_t u=0;
-	uint16_t tempo=0;
+	uint16_t u=0, tempo=0;
 
-	Dbprintf("SENDING DATA FRAME...");
+	Dbprintf("Sending data frame...");
 
 	FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
 
@@ -406,7 +398,7 @@ void SendCmdPCF7931(uint32_t * tab){
 	AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
 
 	//initialization of the timer
-	AT91C_BASE_PMC->PMC_PCER |= (0x1 << 12) | (0x1 << 13) | (0x1 << 14);
+	AT91C_BASE_PMC->PMC_PCER |= (0x1 << AT91C_ID_TC0);
 	AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_TIOA0 | AT91C_TCB_TC2XC2S_NONE;
 	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
 	AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK;  //clock at 48/32 MHz
@@ -415,27 +407,19 @@ void SendCmdPCF7931(uint32_t * tab){
 
 
 	tempo = AT91C_BASE_TC0->TC_CV;
-	for(u=0;tab[u]!= 0;u+=3){
-
+	for( u = 0; tab[u] != 0; u += 3){
 
 		// modulate antenna
 		HIGH(GPIO_SSC_DOUT);
-		while(tempo !=  tab[u]){
-			tempo = AT91C_BASE_TC0->TC_CV;
-		}
+		while(tempo != tab[u]) tempo = AT91C_BASE_TC0->TC_CV;		
 
 		// stop modulating antenna
 		LOW(GPIO_SSC_DOUT);
-		while(tempo !=  tab[u+1]){
-			tempo = AT91C_BASE_TC0->TC_CV;
-		}
-
+		while(tempo != tab[u+1]) tempo = AT91C_BASE_TC0->TC_CV;
 
 		// modulate antenna
 		HIGH(GPIO_SSC_DOUT);
-		while(tempo !=  tab[u+2]){
-			tempo = AT91C_BASE_TC0->TC_CV;
-		}
+		while(tempo != tab[u+2]) tempo = AT91C_BASE_TC0->TC_CV;		
 	}
 
 	LED_A_OFF();
@@ -457,15 +441,14 @@ void SendCmdPCF7931(uint32_t * tab){
 bool AddBytePCF7931(uint8_t byte, uint32_t * tab, int32_t l, int32_t p){
 
 	uint32_t u;
-	for (u=0; u<8; u++)
+	for ( u=0; u<8; u++)
 	{
 		if (byte&(1<<u)) {	//bit à 1
-			if(AddBitPCF7931(1, tab, l, p)==1)return 1;
+			if( AddBitPCF7931(1, tab, l, p)==1) return 1;
 		} else { //bit à 0
-			if(AddBitPCF7931(0, tab, l, p)==1)return 1;
+			if (AddBitPCF7931(0, tab, l, p)==1) return 1;
 		}
 	}
-
 	return 0;
 }
 
@@ -478,27 +461,29 @@ bool AddBytePCF7931(uint8_t byte, uint32_t * tab, int32_t l, int32_t p){
 bool AddBitPCF7931(bool b, uint32_t * tab, int32_t l, int32_t p){
 	uint8_t u = 0;
 
-	for(u=0;tab[u]!=0;u+=3){} //we put the cursor at the last value of the array
+	//we put the cursor at the last value of the array
+	for ( u = 0; tab[u] != 0; u += 3 ) { } 
 	
+	if ( b == 1 ) {	//add a bit 1
+		if ( u == 0 ) 
+			tab[u] = 34 * T0_PCF + p;
+		else
+			tab[u] = 34 * T0_PCF + tab[u-1] + p;
 
-	if(b==1){	//add a bit 1
-		if(u==0) tab[u] = 34*T0_PCF+p;
-		else 	 tab[u] = 34*T0_PCF+tab[u-1]+p;
-
-		tab[u+1] = 6*T0_PCF+tab[u]+l;
-		tab[u+2] = 88*T0_PCF+tab[u+1]-l-p;
+		tab[u+1] =  6 * T0_PCF + tab[u] + l;
+		tab[u+2] = 88 * T0_PCF + tab[u+1] - l - p;
 		return 0;
-	}else{ 		//add a bit 0
+	} else { 		//add a bit 0
 
-		if(u==0) tab[u] = 98*T0_PCF+p;
-		else  	 tab[u] = 98*T0_PCF+tab[u-1]+p;
+		if ( u == 0 )
+			tab[u] = 98 * T0_PCF + p;
+		else
+			tab[u] = 98 * T0_PCF + tab[u-1] + p;
 
-		tab[u+1] = 6*T0_PCF+tab[u]+l;
-		tab[u+2] = 24*T0_PCF+tab[u+1]-l-p;
+		tab[u+1] =  6 * T0_PCF + tab[u] + l;
+		tab[u+2] = 24 * T0_PCF + tab[u+1] - l - p;
 		return 0;
 	}
-
-	
 	return 1;
 }
 
@@ -510,13 +495,11 @@ bool AddBitPCF7931(bool b, uint32_t * tab, int32_t l, int32_t p){
  */
 bool AddPatternPCF7931(uint32_t a, uint32_t b, uint32_t c, uint32_t * tab){
 	uint32_t u = 0;
-	for(u=0;tab[u]!=0;u+=3){} //we put the cursor at the last value of the array
-
-	if(u==0) tab[u] = a;
-	else tab[u] = a + tab[u-1];
+	for(u = 0; tab[u] != 0; u += 3){} //we put the cursor at the last value of the array
 
-	tab[u+1] = b+tab[u];
-	tab[u+2] = c+tab[u+1];
+	tab[u]   = (u == 0) ? a : a + tab[u-1];
+	tab[u+1] = b + tab[u];
+	tab[u+2] = c + tab[u+1];
 
 	return 0;
 }
\ No newline at end of file