+
+/**
+* acquisition of T55x7 LF signal. Similart to other LF, but adjusted with @marshmellows thresholds
+* the data is collected in BigBuf.
+**/
+void doT55x7Acquisition(void){
+
+ #define T55xx_SAMPLES_SIZE 12000 // 32 x 32 x 10 (32 bit times numofblock (7), times clock skip..)
+ #define T55xx_UPPER_THRESHOLD 128+40 // 50
+ #define T55xx_READ_TOL 5
+ #define T55xx_LOWER_THRESHOLD 128-40 //-50
+
+ uint8_t *dest = BigBuf_get_addr();
+ uint16_t bufsize = BigBuf_max_traceLen();
+
+ if ( bufsize > T55xx_SAMPLES_SIZE )
+ bufsize = T55xx_SAMPLES_SIZE;
+
+ uint16_t i = 0;
+ bool startFound = false;
+ bool highFound = false;
+ uint8_t sample = 0;
+ uint8_t firstSample = 0;
+ while(!BUTTON_PRESS()) {
+ WDT_HIT();
+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
+ AT91C_BASE_SSC->SSC_THR = 0x00;
+ 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 high sample
+ if (!startFound && sample > T55xx_UPPER_THRESHOLD) {
+ if (sample > firstSample)
+ firstSample = sample;
+ highFound = TRUE;
+ } else if (!highFound) {
+ continue;
+ }
+
+ // skip until samples begin to change
+ if (startFound || sample < firstSample - T55xx_READ_TOL){
+ if (!startFound)
+ dest[i++] = firstSample;
+ startFound = TRUE;
+ dest[i++] = sample;
+
+ // exit condition.
+ if (i >= bufsize) break;
+ }
+ }
+ }
+}
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