update em4x05 timing (#846)

See @mwalker33 issue #838

diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index c9947d97599e6e150f457c38f224dd36c455cacc..12f9de08741013c139f10c5d18a44e60af3fcc10 100644 (file)
--- 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)
 
        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)
        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
                        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)

                }
        }
 }
                }
        }
 }