Print an error on bad i2c request
Reference: https://github.com/MarlinFirmware/Marlin/pull/3713#issuecomment-218333678
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@ -5040,10 +5040,14 @@ inline void gcode_M121() { endstops.enable_globally(false); }
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uint8_t addr = code_seen('A') ? code_value_short() : 0;
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int bytes = code_seen('B') ? code_value_short() : 0;
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if (addr && bytes) {
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if (addr && bytes > 0 && bytes <= 32) {
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i2c.address(addr);
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i2c.reqbytes(bytes);
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}
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else {
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SERIAL_ERROR_START;
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SERIAL_ERRORLN("Bad i2c request");
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}
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}
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#endif //EXPERIMENTAL_I2CBUS
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