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LCD2004_PCF8547.h
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LCD2004_PCF8547.h
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#ifndef LCD2004_PCF8547_H
#define LCD2004_PCF8547_H
#include <stdint.h>
#define PCF8574_ADDRESS 0x27 // 39 (7-bit address)
//#define PCF8574_ADDRESS (0x27*2) // 39 (8-bit address)
#if !defined(BIT)
#define BIT(b) (1<<(b))
#endif
// PCF8574 8-bit pins map to the following LCD2004 pins:
//
// [7 6 5 4 3 2 1 0 ]
// |D7 D6 D5 D4 BL -E RW RS
//
// NOTE: This is hard-coded to assume the upper four bits are
// the 4 data lines to the LCD, in that order.
typedef enum
{
DB7_BIT = BIT(7), // High nibble for 4-bit mode.
DB6_BIT = BIT(6), //
DB5_BIT = BIT(5), //
DB4_BIT = BIT(4), //
BL_BIT = BIT(3), // Backlight (0=Off, 1=On)
E_BIT = BIT(2), // Enable (0=Disable, 1=Enable)
RW_BIT = BIT(1), // Read/Write (0=Write, 1=Read)
RS_BIT = BIT(0) // Register Select (0=Instruction, 1=Data)
} LCDBitEnum;
// #define DB7_BIT BIT(7) // High nibble for 4-bit mode.
// #define DB6_BIT BIT(6) //
// #define DB5_BIT BIT(5) //
// #define DB4_BIT BIT(4) //
// #define BL_BIT BIT(3) // Backlight (0=Off, 1=On)
// #define E_BIT BIT(2) // Enable (0=Disable, 1=Enable)
// #define RW_BIT BIT(1) // Read/Write (0=Write, 1=Read)
// #define RS_BIT BIT(0) // Register Select (0=Instruction, 1=Data)
// Function Prototypes
bool IsLCDEnabled (void);
bool LCDInit (void);
void LCDTerm (void);
void LCDWriteInstructionNibble (uint8_t nibble);
void LCDWriteByte (uint8_t rsBit, uint8_t value);
void LCDWriteInstructionByte (uint8_t instruction);
void LCDWriteDataByte (uint8_t data);
void LCDWriteData (uint8_t *dataPtr, uint8_t dataSize);
void LCDWriteDataString (uint8_t x, uint8_t y, char *message);
void LCDSetOffset (uint8_t offset);
void LCDSetXY (uint8_t x, uint8_t y);
void LCDClear (void);
void LCDWaitForBusyFlag (void);
#endif /* LCD2004_PCF8547_H */
// End of LCD2004_PCF8547.h