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ADD: 'lf cotag read' - COTAG can be read now.

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This commit is contained in:
iceman1001 2017-02-02 15:32:21 +01:00
commit 5f5b83b743
9 changed files with 232 additions and 41 deletions
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124
armsrc/lfsampling.c
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@ -20,7 +20,7 @@ sample_config config = { 1, 8, 1, 95, 0 } ;
void printConfig() {
Dbprintf("LF Sampling config: ");
Dbprintf(" [q] divisor: %d ", config.divisor);
Dbprintf(" [q] divisor: %d (%d KHz)", config.divisor, 12000 / (config.divisor+1));
Dbprintf(" [b] bps: %d ", config.bits_per_sample);
Dbprintf(" [d] decimation: %d ", config.decimation);
Dbprintf(" [a] averaging: %s ", (config.averaging) ? "Yes" : "No");
@ -140,7 +140,7 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
while(!BUTTON_PRESS() && !usb_poll_validate_length() ) {
WDT_HIT();
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
AT91C_BASE_SSC->SSC_THR = 0x00; //0x43;
AT91C_BASE_SSC->SSC_THR = 0x43;
LED_D_ON();
}
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
@ -310,4 +310,122 @@ void doT55x7Acquisition(size_t sample_size) {
}
}
}
/**
* acquisition of Cotag LF signal. Similart to other LF, since the Cotag has such long datarate RF/384
* and is Manchester?, we directly gather the manchester data into bigbuff
**/
#define COTAG_T1 384
#define COTAG_T2 (COTAG_T1>>1)
#define COTAG_ONE_THRESHOLD 128+30
#define COTAG_ZERO_THRESHOLD 128-30
void doCotagAcquisition(size_t sample_size) {
uint8_t *dest = BigBuf_get_addr();
uint16_t bufsize = BigBuf_max_traceLen();
if ( bufsize > sample_size )
bufsize = sample_size;
dest[0] = 0;
uint8_t sample = 0, firsthigh = 0, firstlow = 0;
uint16_t i = 0;
while (!BUTTON_PRESS() && !usb_poll_validate_length() && (i < bufsize) ) {
WDT_HIT();
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
AT91C_BASE_SSC->SSC_THR = 0x43;
LED_D_ON();
}
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
LED_D_OFF();
// find first peak
if ( !firsthigh ) {
if (sample < COTAG_ONE_THRESHOLD)
continue;
firsthigh = 1;
}
if ( !firstlow ){
if (sample > COTAG_ZERO_THRESHOLD )
continue;
firstlow = 1;
}
++i;
if ( sample > COTAG_ONE_THRESHOLD)
dest[i] = 255;
else if ( sample < COTAG_ZERO_THRESHOLD)
dest[i] = 0;
else
dest[i] = dest[i-1];
}
}
}
uint32_t doCotagAcquisitionManchester() {
uint8_t *dest = BigBuf_get_addr();
uint16_t bufsize = BigBuf_max_traceLen();
if ( bufsize > 320 )
bufsize = 320;
dest[0] = 0;
uint8_t sample = 0, firsthigh = 0, firstlow = 0;
uint16_t sample_counter = 0, period = 0;
uint8_t curr = 0, prev = 0;
while (!BUTTON_PRESS() && !usb_poll_validate_length() && (sample_counter < bufsize) ) {
WDT_HIT();
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
AT91C_BASE_SSC->SSC_THR = 0x43;
LED_D_ON();
}
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
LED_D_OFF();
// find first peak
if ( !firsthigh ) {
if (sample < COTAG_ONE_THRESHOLD)
continue;
firsthigh = 1;
}
if ( !firstlow ){
if (sample > COTAG_ZERO_THRESHOLD )
continue;
firstlow = 1;
}
// set sample 255, 0, or previous
if ( sample > COTAG_ONE_THRESHOLD){
prev = curr;
curr = 1;
}
else if ( sample < COTAG_ZERO_THRESHOLD) {
prev = curr;
curr = 0;
}
else {
curr = prev;
}
// full T1 periods,
if ( period > 0 ) {
--period;
continue;
}
dest[sample_counter] = curr;
++sample_counter;
period = COTAG_T1;
}
}
return sample_counter;
}