#include "inc/hw_types.h"

#include "i2ctools.h"

#include "driverlib/i2c.h"

#include "inc/hw_memmap.h"

#include "driverlib/gpio.h"

// 80MHz clock so 80,000 is about 1ms

void cheapDelay(unsigned long delay)

{

while(delay--);

}

void i2c_init()

{

// Trying to get around this damn I2C lockup issue

GPIOPinTypeGPIOOutput(GPIO_PORTG_BASE, GPIO_PIN_0);

GPIOPinTypeGPIOInput(GPIO_PORTG_BASE, GPIO_PIN_1);

while(!GPIOPinRead(GPIO_PORTG_BASE, GPIO_PIN_1))

{

// Toggle the clock at 100kHz until the slave releases SDA

GPIOPinWrite(GPIO_PORTG_BASE, GPIO_PIN_0, GPIO_PIN_0);

cheapDelay(400);

GPIOPinWrite(GPIO_PORTG_BASE, GPIO_PIN_0, ~GPIO_PIN_0);

cheapDelay(400);

}

// Initialize the I2C channel the sensor is connected to

SysCtlPeripheralEnable( SYSCTL_PERIPH_I2C1 );

GPIOPinConfigure( GPIO_PG0_I2C1SCL );

GPIOPinConfigure( GPIO_PG1_I2C1SDA );

GPIOPinTypeI2C( GPIO_PORTG_BASE, GPIO_PIN_0 | GPIO_PIN_1 );

// Set the clock (false = "slow" = 100kbps)

I2CMasterInitExpClk( I2C1_MASTER_BASE, SysCtlClockGet(), false );

I2CMasterEnable( I2C1_MASTER_BASE );

}

void i2c_tx_single(unsigned char SlaveAddr, unsigned char dest, unsigned char data)

{

I2CMasterSlaveAddrSet( I2C1_MASTER_BASE, SlaveAddr, I2C_SEND );

I2CMasterDataPut( I2C1_MASTER_BASE, dest );

I2CMasterControl( I2C1_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START );

while(I2CMasterBusy(I2C1_MASTER_BASE));

I2CMasterDataPut( I2C1_MASTER_BASE, data );

I2CMasterControl( I2C1_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH );

while(I2CMasterBusy(I2C1_MASTER_BASE));

}

unsigned long i2c_rx_single(unsigned char SlaveAddr, unsigned char dest)

{

I2CMasterSlaveAddrSet( I2C1_MASTER_BASE, SlaveAddr, I2C_SEND );

I2CMasterDataPut( I2C1_MASTER_BASE, dest );

I2CMasterControl( I2C1_MASTER_BASE, I2C_MASTER_CMD_SINGLE_SEND );

while (I2CMasterBusy( I2C1_MASTER_BASE ));

I2CMasterSlaveAddrSet( I2C1_MASTER_BASE, SlaveAddr, I2C_RECEIVE );

I2CMasterControl( I2C1_MASTER_BASE, I2C_MASTER_CMD_SINGLE_RECEIVE );

while(I2CMasterBusy( I2C1_MASTER_BASE ));

return I2CMasterDataGet(I2C1_MASTER_BASE);

}

void i2c_rx_multi(unsigned char SlaveAddr, unsigned char dest, unsigned char num_bytes, unsigned long *data)

{

unsigned int i=0;

// Set the address

I2CMasterSlaveAddrSet( I2C1_MASTER_BASE, SlaveAddr, I2C_SEND );

I2CMasterDataPut( I2C1_MASTER_BASE, dest );

I2CMasterControl( I2C1_MASTER_BASE, I2C_MASTER_CMD_SINGLE_SEND );

while (I2CMasterBusy( I2C1_MASTER_BASE ));

// Set the address again to tell the device to start sending data

I2CMasterSlaveAddrSet( I2C1_MASTER_BASE, SlaveAddr, I2C_RECEIVE );

I2CMasterControl( I2C1_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START );

while(I2CMasterBusy( I2C1_MASTER_BASE ));

*data++ = I2CMasterDataGet(I2C1_MASTER_BASE);

while(i++ < (num_bytes-2))

{

I2CMasterControl( I2C1_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT );

while(I2CMasterBusy( I2C1_MASTER_BASE ));

*data++ = I2CMasterDataGet(I2C1_MASTER_BASE);

}

I2CMasterControl( I2C1_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH );

while(I2CMasterBusy( I2C1_MASTER_BASE ));

*data++ = I2CMasterDataGet(I2C1_MASTER_BASE);

}