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corrected ebus crc check (#20081)

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papax333 2023-11-22 11:57:10 +01:00 committed by GitHub
parent 7e2fbdea55
commit 77081ad92b
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1 changed files with 18 additions and 5 deletions
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23
tasmota/tasmota_xsns_sensor/xsns_53_sml.ino
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@ -1337,6 +1337,19 @@ void ebus_esc(uint8_t *ebus_buffer, unsigned char len) {
}
// check ebus escapes
uint8_t check_ebus_esc(uint8_t *ebus_buffer, unsigned char len) {
short count,count1;
count1 = 0;
for (count = 0; count < len; count++) {
if (ebus_buffer[count] == EBUS_ESC) {
//found escape
count1++;
}
}
return count1;
}
uint8_t ebus_crc8(uint8_t data, uint8_t crc_init) {
uint8_t crc;
uint8_t polynom;
@ -1568,16 +1581,16 @@ void sml_shift_in(uint32_t meters, uint32_t shard) {
if (iob == EBUS_SYNC) {
// should be end of telegramm
// QQ,ZZ,PB,SB,NN ..... CRC, ACK SYNC
if (mp->spos > 4 + 5) {
if (mp->spos > 5 && mp->spos > mp->sbuff[4] + 5) {
// get telegramm lenght
uint16_t tlen = mp->sbuff[4] + 5;
uint16_t tlen = mp->sbuff[4] + 5 + check_ebus_esc(mp->sbuff, mp->spos);
// test crc
if (mp->sbuff[tlen] = ebus_CalculateCRC(mp->sbuff, tlen)) {
ebus_esc(mp->sbuff, tlen);
if (mp->sbuff[tlen] == ebus_CalculateCRC(mp->sbuff, tlen)) {
ebus_esc(mp->sbuff, mp->spos);
SML_Decode(meters);
} else {
// crc error
//AddLog(LOG_LEVEL_INFO, PSTR("ebus crc error"));
AddLog(LOG_LEVEL_INFO, PSTR("ebus crc error"));
}
}
mp->spos = 0;