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Fix checksum discarding high-order byte of size field

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This commit is contained in:
BlackMark 2020-04-11 10:34:40 +02:00
parent c5b3614733
commit 9ba16e71e1
1 changed files with 4 additions and 5 deletions
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9
stk500v2/main.cpp
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@ -31,11 +31,10 @@ static inline bool receiveByte(uint8_t &data, uint16_t timeout = 1000)
static inline uint8_t calcChecksum(const Message &msg) static inline uint8_t calcChecksum(const Message &msg)
{ {
uint8_t checksum = msg.start; uint8_t checksum = msg.start;
checksum ^= msg.number;
checksum ^= msg.size; for (uint16_t i = 1; i < 5 + msg.size; ++i) {
checksum ^= msg.token; checksum ^= *(reinterpret_cast<const uint8_t *>(&msg) + i);
for (uint8_t i = 0; i < msg.size; ++i) }
checksum ^= msg.body[i];
return checksum; return checksum;
} }