Support for repeated starts added to SAM Wire library
Additional interface method ported to avr for compatibility Fix issue #2428.
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@ -80,8 +80,26 @@ void TwoWire::setClock(uint32_t frequency)
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TWBR = ((F_CPU / frequency) - 16) / 2;
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}
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uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop)
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uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint32_t iaddress, uint8_t isize, uint8_t sendStop)
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{
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if (isize > 0) {
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// send internal address; this mode allows sending a repeated start to access
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// some devices' internal registers. This function is executed by the hardware
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// TWI module on other processors (for example Due's TWI_IADR and TWI_MMR registers)
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beginTransmission(address);
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// the maximum size of internal address is 3 bytes
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if (isize > 3){
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isize = 3;
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}
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// write internal register address - most significant byte first
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while (isize-- > 0)
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write((uint8_t)(iaddress >> (isize*8)));
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endTransmission(false);
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}
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// clamp to buffer length
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if(quantity > BUFFER_LENGTH){
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quantity = BUFFER_LENGTH;
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@ -95,6 +113,10 @@ uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop
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return read;
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}
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uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop) {
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return requestFrom((uint8_t)address, (uint8_t)quantity, (uint32_t)0, (uint8_t)0, (uint8_t)sendStop);
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}
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uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity)
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{
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return requestFrom((uint8_t)address, (uint8_t)quantity, (uint8_t)true);
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@ -56,6 +56,7 @@ class TwoWire : public Stream
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uint8_t endTransmission(uint8_t);
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uint8_t requestFrom(uint8_t, uint8_t);
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uint8_t requestFrom(uint8_t, uint8_t, uint8_t);
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uint8_t requestFrom(uint8_t, uint8_t, uint32_t, uint8_t, uint8_t);
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uint8_t requestFrom(int, int);
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uint8_t requestFrom(int, int, int);
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virtual size_t write(uint8_t);
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