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ignore null telegrams

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proddy
2019-03-24 19:45:59 +01:00
parent 7af42ac8ae
commit 8b0d91a9b8
2 changed files with 15 additions and 19 deletions
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25
src/ems.cpp
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@@ -579,33 +579,34 @@ void _createValidate() {
/*
* Entry point TODO: tidy up
* Entry point triggered by an interrupt in emsuart.cpp
* length is only data bytes, excluding the BRK
* Read commands are asynchronous as they're handled by the interrupt
* When a telegram is processed we forcefully erase it from the stack to prevent overflow
*/
void ems_parseTelegram(uint8_t * telegram, uint8_t length) {
_ems_readTelegram(telegram, length);
// now clear it just be safe
for (uint8_t i = 0; i < EMS_MAXBUFFERSIZE; i++) {
telegram[i] = 0x00;
if ((length != 0) && (telegram[0] != 0x00)) {
_ems_readTelegram(telegram, length);
}
// now clear the Rx buffer just be safe and prevent duplicates
for (uint8_t i = 0; i < EMS_MAXBUFFERSIZE; telegram[i++] = 0x00)
;
}
/**
* the main logic that parses the telegram message, triggered by an interrupt in emsuart.cpp
* length is only data bytes, excluding the BRK
* Read commands are asynchronous as they're handled by the interrupt
* the main logic that parses the telegram message
* When we receive a Poll Request we need to send any Tx packages quickly within a 200ms window
*/
void _ems_readTelegram(uint8_t * telegram, uint8_t length) {
// check if we just received a single byte
// it could well be a Poll request from the boiler for us, which will have a value of 0x8B (0x0B | 0x80)
// or either a return code like 0x01 or 0x04 from the last Write command
// create the Rx package
static _EMS_RxTelegram EMS_RxTelegram;
EMS_RxTelegram.length = length;
EMS_RxTelegram.telegram = telegram;
EMS_RxTelegram.timestamp = millis();
// check if we just received a single byte
// it could well be a Poll request from the boiler for us, which will have a value of 0x8B (0x0B | 0x80)
// or either a return code like 0x01 or 0x04 from the last Write command
if (length == 1) {
uint8_t value = telegram[0]; // 1st byte of data package