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- #ifndef ROWSCANNER_SPI_SHIFTREGISTERS_H
- #define ROWSCANNER_SPI_SHIFTREGISTERS_H
- #include <Arduino.h>
- #include <inttypes.h>
- #include <SPI.h>
- #include <RowScannerInterface.h>
- #include <RowPort.h>
- #include <ColPort.h>
-
- /* RowScanner_SPIShiftRegisters reads all shift registers in a daisy chain.
- The maximum keys per row is 31, because Arduino's largest type is 32 bits and rowEnd consumes the last bit.
- //todo delete: Assumes only one row of shift registers is connected (no Slave Select).
- */
- class RowScanner_SPIShiftRegisters : public RowScannerInterface
- {
- private:
- //todo static const bool ACTIVE_HIGH; //logic level of strobe pin: 0=activeLow, 1=activeHigh
- const uint8_t STROBE_PIN; //Arduino pin number connected to this row
- const uint8_t SHIFT_LOAD; //controller's pin number that is connected to shift register's SHIFT_LOAD pin
- const uint8_t BYTE_COUNT; //number of bytes to read from shift registers
- const uint8_t KEY_COUNT; //number of keys in row
- public:
- RowScanner_SPIShiftRegisters(const uint8_t STROBE_PIN, const uint8_t SHIFT_LOAD,
- uint8_t BYTE_COUNT, uint8_t KEY_COUNT)
- : STROBE_PIN(STROBE_PIN), SHIFT_LOAD(SHIFT_LOAD),
- BYTE_COUNT(BYTE_COUNT), KEY_COUNT(KEY_COUNT) {}
- virtual read_pins_t scan(read_pins_mask_t& rowEnd);
- void begin();
- };
- #endif
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