86 lines
2.3 KiB
C++
86 lines
2.3 KiB
C++
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#ifndef __SPIUART_H__
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#define __SPIUART_H__
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#include "Configuration.h"
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#include "_Spi.h"
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// Until we implement a bulk transfer method that takes into account
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// the available space in the transmit buffer we will disable bulk transfers.
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// The present method of bulk transfers risks overflowing the SPI UART
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// transmit buffer.
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// Disabling the transfers means we use the standard byte-at-time routine
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// from the Print class.
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// This isn't a big issue at 9600 baud at least because sending things
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// a byte at a time doesn't slow us down noticeably.
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// TODO: Implement better bulk transfer method
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#define ENABLE_BULK_TRANSFERS 0
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// SC16IS750 Register definitions
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// TODO: Don't bit shift these here, do it in the read/write register routines
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#define THR 0x00 << 3
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#define RHR 0x00 << 3
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#define IER 0x01 << 3
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#define FCR 0x02 << 3
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#define IIR 0x02 << 3
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#define LCR 0x03 << 3
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#define MCR 0x04 << 3
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#define LSR 0x05 << 3
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#define MSR 0x06 << 3
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#define SPR 0x07 << 3
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#define TXLVL 0x08 << 3
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#define RXLVL 0x09 << 3
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#define DLAB 0x80 << 3
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#define IODIR 0x0A << 3
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#define IOSTATE 0x0B << 3
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#define IOINTMSK 0x0C << 3
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#define IOCTRL 0x0E << 3
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#define EFCR 0x0F << 3
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#define DLL 0x00 << 3
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#define DLM 0x01 << 3
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#define EFR 0x02 << 3
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#define XON1 0x04 << 3
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#define XON2 0x05 << 3
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#define XOFF1 0x06 << 3
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#define XOFF2 0x07 << 3
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// See Chapter 11 of datasheet
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#define SPI_READ_MODE_FLAG 0x80
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#define BAUD_RATE_DEFAULT 9600 // WiFly default baudrate
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class SpiUartDevice : public SpiDevice, public Stream {
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public:
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void begin(unsigned long baudrate = BAUD_RATE_DEFAULT);
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int available();
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int read();
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size_t write(byte value);
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size_t write(const char *str, size_t size);
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using Print::write;
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void flush();
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//required for Stream
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int peek() {return 0;};
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// These are specific to the SPI UART
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void ioSetDirection(unsigned char bits);
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void ioSetState(unsigned char bits);
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private:
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void writeRegister(byte registerAddress, byte data);
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byte readRegister(byte registerAddress);
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void initUart(unsigned long baudrate);
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void configureUart(unsigned long baudrate);
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void setBaudRate(unsigned long baudrate);
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boolean uartConnected();
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};
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#endif
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