Fixed rxwm setting as it defines the maximum number of received bytes
*before* the interrupt
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@ -169,7 +169,7 @@ public:
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template<size_t SIZE>
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static bool transfer(std::array<uint8_t, SIZE>& bytes){
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csmode_reg().mode=2; // HOLD mode
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rxctrl_reg().rxmark=bytes.size(); // trigger irq if 3 bytes are received;
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rxctrl_reg().rxmark=bytes.size()-1; // trigger irq if more than 2 bytes are received;
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ie_reg().rxwm=1;
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// write data bytes
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for(size_t i=0; i<bytes.size(); ++i)
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