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lf t55xx code cleanup +

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@iceman1001 s cleanup of some t55xx read code, plus some timing tests to
improve lf t5 detect/read...
small typo in pcf 16 address bytes instead of 4...
add option for verbose or not on bigbuf clear cmd.
This commit is contained in:
marshmellow42 2015-10-15 14:53:49 -04:00
commit 7cfc777b0e
9 changed files with 165 additions and 152 deletions
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57
armsrc/lfsampling.c
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@ -103,7 +103,6 @@ void LFSetupFPGAForADC(int divisor, bool lf_field)
FpgaSetupSsc();
}
/**
* Does the sample acquisition. If threshold is specified, the actual sampling
* is not commenced until the threshold has been reached.
@ -154,9 +153,6 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
if ((trigger_threshold > 0) && (sample < (trigger_threshold+128)) && (sample > (128-trigger_threshold))) //
continue;
//if (trigger_threshold > 0 && sample < trigger_threshold) //
//continue;
trigger_threshold = 0;
sample_total_numbers++;
@ -252,3 +248,56 @@ uint32_t SnoopLF()
{
return ReadLF(false, true);
}
/**
* 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_READ_UPPER_THRESHOLD 128+40 // 50
#define T55xx_READ_TOL 5
uint8_t *dest = BigBuf_get_addr();
uint16_t bufsize = BigBuf_max_traceLen();
if ( bufsize > T55xx_SAMPLES_SIZE )
bufsize = T55xx_SAMPLES_SIZE;
//memset(dest, 0, bufsize);
uint16_t i = 0;
bool startFound = false;
bool highFound = false;
uint8_t curSample = 0;
uint8_t firstSample = 0;
for(;;) {
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;
// find first high sample
if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
if (curSample > firstSample)
firstSample = curSample;
highFound = true;
} else if (!highFound) {
continue;
}
// skip until samples begin to change
if (startFound || curSample < firstSample-T55xx_READ_TOL){
if (!startFound)
dest[i++] = firstSample;
startFound = true;
dest[i++] = curSample;
LED_D_OFF();
if (i >= bufsize) break;
}
}
}
}