rpiGpio.h

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#ifndef _RPI_GPIO_H_
#define _RPI_GPIO_H_

#include "bcm2835_gpio.h"
#include <stdio.h>
#include <stdint.h>

#define CORE_CLK_HZ                 250000000

#define ERRORS                          \
    ERROR(OK)                           \
    ERROR(ERROR_DEFAULT)                \
    ERROR(ERROR_INVALID_PIN_NUMBER)     \
    ERROR(ERROR_RANGE)                  \
    ERROR(ERROR_NULL)                   \
    ERROR(ERROR_EXTERNAL)               \
    ERROR(ERROR_NOT_INITIALISED)        \
    ERROR(ERROR_ALREADY_INITIALISED)    \
    ERROR(ERROR_I2C_NACK)               \
    ERROR(ERROR_I2C)                    \
    ERROR(ERROR_I2C_CLK_TIMEOUT)        \
    ERROR(ERROR_INVALID_BSC)        \


#undef  ERROR

#define ERROR(x) x,


#define I2C_CLOCK_FREQ_MIN         10000

#define I2C_CLOCK_FREQ_MAX         400000

typedef enum {
    ERRORS
    ERROR_MAX
} errStatus;

typedef enum {
    low  = 0x0, 
    high = 0x1  
} eState;

typedef enum {
    pullDisable = GPPUD_DISABLE,  
    pulldown    = GPPUD_PULLDOWN, 
    pullup      = GPPUD_PULLUP    
} eResistor;

typedef enum {
    input  = GPFSEL_INPUT,        
    output = GPFSEL_OUTPUT,       
    alt0   = GPFSEL_ALT0,         
    alt1   = GPFSEL_ALT1,         
    alt2   = GPFSEL_ALT2,         
    alt3   = GPFSEL_ALT3,         
    alt4   = GPFSEL_ALT4,         
    alt5   = GPFSEL_ALT5,         
    eFunctionMin = GPFSEL_INPUT,  
    eFunctionMax = GPFSEL_ALT3    
} eFunction;

/* Function Prototypes */
errStatus gpioSetup(void);
errStatus gpioCleanup(void);
errStatus gpioSetFunction(int gpioNumber, eFunction function);
errStatus gpioSetPin(int gpioNumber, eState state);
errStatus gpioReadPin(int gpioNumber, eState * state);
errStatus gpioSetPullResistor(int gpioNumber, eResistor resistor);
errStatus gpioGetI2cPins(int * gpioNumberScl, int * gpioNumberSda);

errStatus gpioI2cSetup(void);
errStatus gpioI2cCleanup(void);
errStatus gpioI2cSetClock(int frequency);
errStatus gpioI2cSet7BitSlave(uint8_t slaveAddress);
errStatus gpioI2cWriteData(const uint8_t * data, uint16_t dataLength);
errStatus gpioI2cReadData(uint8_t * buffer, uint16_t bytesToRead);

const char * gpioErrToString(errStatus error);
int dbgPrint(FILE * stream, const char * file, int line, const char * format, ...);

#define DBG_INFO stderr,__FILE__,__LINE__


/* Revision specific TODO not sure if it should be public maybe private revisions
 * header?*/
#define REV1_PINCNT 17

#define REV2_PINCNT 17

#define REV1_PINS {0, 1, 4, 7, 8, 9, 10, 11, 14, 15, 17, 18, 21, 22, 23, 24, 25}

#define REV2_PINS {2, 3, 4, 7, 8, 9, 10, 11, 14, 15, 17, 18, 22, 23, 24, 25, 27}

#define REV1_SDA 0

#define REV1_SCL 1

#define REV2_SDA 2

#define REV2_SCL 3

typedef enum {
    pcbRevError = 0,
    pcbRev1 = 1,
    pcbRev2 = 2,
} tPcbRev;


#endif /* _RPI_GPIO_H_ */