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Configurable CRC

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This commit is contained in:
Sassa NF
2025-01-16 19:19:29 +00:00
parent 32ae20632a
commit 48c5f8d1ce
5 changed files with 74 additions and 8 deletions
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lib/comms/comms.cpp
+10 -5
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@@ -184,19 +184,18 @@ String _scan_str(ScanTask &);
String _scan_result_str(ScanTaskResult &);
String _wrap_str(String);
#define POLY 0x1021
uint16_t crc16(String v, uint16_t c)
uint16_t crc16(uint16_t poly, uint16_t c, size_t sz, uint8_t *v)
{
c ^= 0xffff;
for (int i = 0; i < v.length(); i++)
for (int i = 0; i < sz; i++)
{
uint16_t ch = v.charAt(i);
uint16_t ch = v[i];
c = c ^ (ch << 8);
for (int j = 0; j < 8; j++)
{
if (c & 0x8000)
{
c = (c << 1) ^ POLY;
c = (c << 1) ^ poly;
}
else
{
@@ -208,6 +207,12 @@ uint16_t crc16(String v, uint16_t c)
return c ^ 0xffff;
}
#define POLY 0x1021
uint16_t crc16(String v, uint16_t c)
{
return crc16(POLY, c, v.length(), (uint8_t *)v.c_str());
}
void ReadlineComms::_onReceive()
{
while (serial.available() > 0)