-/**
-* acquisition of T55x7 LF signal. Similart to other LF, but adjusted with @marshmellows thresholds
-* the data is collected in BigBuf.
-**/
-void doT55x7Acquisition(size_t sample_size) {
-
- #define T55xx_READ_UPPER_THRESHOLD 128+60 // 60 grph
- #define T55xx_READ_LOWER_THRESHOLD 128-60 // -60 grph
- #define T55xx_READ_TOL 5
-
- uint8_t *dest = BigBuf_get_addr();
- uint16_t bufsize = BigBuf_max_traceLen();
-
- if ( bufsize > sample_size )
- bufsize = sample_size;
-
- uint16_t i = 0;
- bool startFound = false;
- bool highFound = false;
- bool lowFound = false;
- uint8_t curSample = 0;
- uint8_t lastSample = 0;
- uint16_t skipCnt = 0;
- while(!BUTTON_PRESS() && !usb_poll_validate_length() && skipCnt<1000 && 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) {
- curSample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
- LED_D_OFF();
-
- // skip until the first high sample above threshold
- if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
- //if (curSample > lastSample)
- // lastSample = curSample;
- highFound = true;
- } else if (!highFound) {
- skipCnt++;
- continue;
- }
- // skip until the first Low sample below threshold
- if (!startFound && curSample < T55xx_READ_LOWER_THRESHOLD) {
- //if (curSample > lastSample)
- lastSample = curSample;
- lowFound = true;
- } else if (!lowFound) {
- skipCnt++;
- continue;
- }
-
-
- // skip until first high samples begin to change
- if (startFound || curSample > T55xx_READ_LOWER_THRESHOLD+T55xx_READ_TOL){
- // if just found start - recover last sample
- if (!startFound) {
- dest[i++] = lastSample;
- startFound = true;
- }
- // collect samples
- dest[i++] = curSample;
- }
- }
- }
-}
-