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ADD: num_to_bytebitsLSBF function.

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ADD: lf guard clone - works...  needs some checking.
ADD: added a option to "addparity" to set zero on fixed pos.
This commit is contained in:
iceman1001 2016-02-28 22:43:21 +01:00
commit 0d2c590974
5 changed files with 121 additions and 70 deletions
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17
common/lfdemod.c
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@ -95,7 +95,7 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p
// by marshmellow
// takes a array of binary values, length of bits per parity (includes parity bit),
// Parity Type (1 for odd; 0 for even; 2 Always 1's), and binary Length (length to run)
// Parity Type (1 for odd; 0 for even; 2 Always 1's; 3 Always 0's), and binary Length (length to run)
size_t addParity(uint8_t *BitSource, uint8_t *dest, uint8_t sourceLen, uint8_t pLen, uint8_t pType)
{
uint32_t parityWd = 0;
@ -105,12 +105,16 @@ size_t addParity(uint8_t *BitSource, uint8_t *dest, uint8_t sourceLen, uint8_t p
parityWd = (parityWd << 1) | BitSource[word+bit];
dest[j++] = (BitSource[word+bit]);
}
// if parity fails then return 0
if (pType == 2) { // then marker bit which should be a 1
dest[j++]=1;
} else {
dest[j++] = parityTest(parityWd, pLen-1, pType) ^ 1;
switch (pType) {
case 3: dest[j++]=0; break; // marker bit which should be a 0
case 2: dest[j++]=1; break; // marker bit which should be a 1
default:
dest[j++] = parityTest(parityWd, pLen-1, pType) ^ 1;
break;
}
bitCnt += pLen;
parityWd = 0;
}
@ -122,8 +126,7 @@ size_t addParity(uint8_t *BitSource, uint8_t *dest, uint8_t sourceLen, uint8_t p
uint32_t bytebits_to_byte(uint8_t *src, size_t numbits)
{
uint32_t num = 0;
for(int i = 0 ; i < numbits ; i++)
{
for(int i = 0 ; i < numbits ; i++) {
num = (num << 1) | (*src);
src++;
}