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Fix Modbus timeouts reading reg blocks

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Norbert Richter 2021-01-20 14:02:53 +01:00
parent d4c2282170
commit 204d738053
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GPG Key ID: 6628701A626FA674
1 changed files with 24 additions and 20 deletions
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10
lib/lib_basic/TasmotaModbus-1.2.0/src/TasmotaModbus.cpp
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@ -81,8 +81,9 @@ bool TasmotaModbus::ReceiveReady()
uint8_t TasmotaModbus::ReceiveBuffer(uint8_t *buffer, uint8_t register_count) uint8_t TasmotaModbus::ReceiveBuffer(uint8_t *buffer, uint8_t register_count)
{ {
mb_len = 0; mb_len = 0;
uint32_t last = millis(); uint32_t timeout = millis() + 10;
while ((available() > 0) && (mb_len < (register_count *2) + 5) && (millis() - last < 10)) { while ((mb_len < (register_count *2) + 5) && (millis() < timeout)) {
if (available()) {
uint8_t data = (uint8_t)read(); uint8_t data = (uint8_t)read();
if (!mb_len) { // Skip leading data as provided by hardware serial if (!mb_len) { // Skip leading data as provided by hardware serial
if (mb_address == data) { if (mb_address == data) {
@ -104,7 +105,10 @@ uint8_t TasmotaModbus::ReceiveBuffer(uint8_t *buffer, uint8_t register_count)
} }
} }
} }
last = millis();
timeout = millis() + 10;
}
} }
if (mb_len < 7) { return 7; } // 7 = Not enough data if (mb_len < 7) { return 7; } // 7 = Not enough data