From: marshmellow42 <marshmellow42@users.noreply.github.com>
Date: Thu, 11 Jul 2019 18:31:51 +0000 (-0400)
Subject: update em4x05 timing (#846)
X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/817611f5651d4e99e13f091baf098d8385c69cb8

update em4x05 timing (#846)

See @mwalker33 issue #838
---

diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index c9947d97..12f9de08 100644
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -1907,7 +1907,7 @@ void SendForward(uint8_t fwd_bit_count) {
 	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);//field on
 	WaitUS(18*8); //18 cycles on (8us each)
 
-	// now start writting
+	// now start writting - each bit should be 32*8 total length
 	while(fwd_bit_sz-- > 0) { //prepare next bit modulation
 		if(((*fwd_write_ptr++) & 1) == 1)
 			WaitUS(32*8); //32 cycles at 125Khz (8us each)
@@ -1916,7 +1916,7 @@ void SendForward(uint8_t fwd_bit_count) {
 			FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
 			WaitUS(23*8); //23 cycles off (8us each)
 			FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);//field on
-			WaitUS(18*8); //18 cycles on (8us each)
+			WaitUS((32-23)*8); //remaining cycles on (8us each)
 		}
 	}
 }