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This commit is contained in:
Philippe Teuwen 2021-10-10 01:35:38 +02:00
commit 88308ea727
98 changed files with 271 additions and 271 deletions
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10
armsrc/legicrf.c
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@ -38,10 +38,10 @@ static crc_t legic_crc;
// - 100us for a 1 (RWD_TIME_1)
//
// The data dependent timing makes writing comprehensible code significantly
// harder. The current aproach forwards the prng data based if there is data on
// harder. The current approach forwards the prng data based if there is data on
// air and time based, using GET_TICKS, during computational and wait periodes.
//
// To not have the necessity to calculate/guess exection time dependend timeouts
// To not have the necessity to calculate/guess execution time dependend timeouts
// tx_frame and rx_frame use a shared timestamp to coordinate tx and rx timeslots.
//-----------------------------------------------------------------------------
@ -79,10 +79,10 @@ static uint16_t rx_frame_from_fpga(void) {
// Demodulation (Reader)
//-----------------------------------------------------------------------------
// Returns a demedulated bit
// Returns a demodulated bit
//
// The FPGA running xcorrelation samples the subcarrier at ~13.56 MHz. The mode
// was initialy designed to receive BSPK/2-PSK. Hance, it reports an I/Q pair
// was initially designed to receive BSPK/2-PSK. Hance, it reports an I/Q pair
// every 4.7us (8 bits i and 8 bits q).
//
// The subcarrier amplitude can be calculated using Pythagoras sqrt(i^2 + q^2).
@ -93,7 +93,7 @@ static uint16_t rx_frame_from_fpga(void) {
// and averages the next (most stable) 8 samples. The final 8 samples are dropped
// also.
//
// The demodulated should be alligned to the bit period by the caller. This is
// The demodulated should be aligned to the bit period by the caller. This is
// done in rx_bit and rx_ack.
//
// Note: The demodulator would be drifting (18.9us * 5 != 100us), rx_frame