//*****************************************************************************
//
// soft_i2c_atmel.c - Software I2C master example.
//
// Copyright (c) 2010-2017 Texas Instruments Incorporated. All rights reserved.
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//
// This is part of revision 2.1.4.178 of the Tiva Firmware Development Package.
//
//*****************************************************************************
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/timer.h"
#include "driverlib/uart.h"
#include "utils/softi2c.h"
#include "utils/uartstdio.h"
//*****************************************************************************
//
//! \addtogroup i2c_examples_list
//! <h1>SoftI2C AT24C08A EEPROM (soft_i2c_atmel)</h1>
//!
//! This example shows how to configure the SoftI2C module to read and write an
//! Atmel AT24C08A EEPROM. A pattern is written into the first 16 bytes of the
//! EEPROM and then read back.
//!
//! This example uses the following peripherals and I/O signals. You must
//! review these and change as needed for your own board:
//! - Timer0 peripheral (for the SoftI2C timer)
//! - GPIO Port B peripheral (for SoftI2C pins)
//! - PB2 (for SCL)
//! - PB3 (for SDA)
//!
//! The following UART signals are configured only for displaying console
//! messages for this example. These are not required for operation of I2C.
//! - UART0 peripheral
//! - GPIO Port A peripheral (for UART0 pins)
//! - UART0RX - PA0
//! - UART0TX - PA1
//!
//! This example uses the following interrupt handlers. To use this example
//! in your own application, you must add these interrupt handlers to your
//! vector table.
//! - INT_TIMER0A - Timer0AIntHandler
//
//*****************************************************************************
//*****************************************************************************
//
// The I2C slave address of the AT24C08A EEPROM device. This address is based
// on the A2 pin of the AT24C08A being pulled high on the board.
//
//*****************************************************************************
#define SLAVE_ADDR 0x54
//*****************************************************************************
//
// The states in the interrupt handler state machine.
//
//*****************************************************************************
#define STATE_IDLE 0
#define STATE_WRITE_NEXT 1
#define STATE_WRITE_FINAL 2
#define STATE_WAIT_ACK 3
#define STATE_SEND_ACK 4
#define STATE_READ_ONE 5
#define STATE_READ_FIRST 6
#define STATE_READ_NEXT 7
#define STATE_READ_FINAL 8
#define STATE_READ_WAIT 9
//*****************************************************************************
//
// The state of the SoftI2C module.
//
//*****************************************************************************
static tSoftI2C g_sI2C;
//*****************************************************************************
//
// The variables that track the data to be transmitted or received.
//
//*****************************************************************************
static uint8_t *g_pui8Data = 0;
static uint32_t g_ui32Count = 0;
//*****************************************************************************
//
// The current state of the interrupt handler state machine.
//
//*****************************************************************************
static volatile uint32_t g_ui32State = STATE_IDLE;
//*****************************************************************************
//
// This function sets up UART0 to be used for a console to display information
// as the example is running.
//
//*****************************************************************************
void
InitConsole(void)
{
//
// Enable GPIO port A which is used for UART0 pins.
// TODO: change this to whichever GPIO port you are using.
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
//
// Configure the pin muxing for UART0 functions on port A0 and A1.
// This step is not necessary if your part does not support pin muxing.
// TODO: change this to select the port/pin you are using.
//
GPIOPinConfigure(GPIO_PA0_U0RX);
GPIOPinConfigure(GPIO_PA1_U0TX);
//
// Enable UART0 so that we can configure the clock.
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
//
// Use the internal 16MHz oscillator as the UART clock source.
//
UARTClockSourceSet(UART0_BASE, UART_CLOCK_PIOSC);
//
// Select the alternate (UART) function for these pins.
// TODO: change this to select the port/pin you are using.
//
GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
//
// Initialize the UART for console I/O.
//
UARTStdioConfig(0, 115200, 16000000);
}
//*****************************************************************************
//
// The callback function for the SoftI2C module.
//
//*****************************************************************************
void
SoftI2CCallback(void)
{
//
// Clear the SoftI2C interrupt.
//
SoftI2CIntClear(&g_sI2C);
//
// Determine what to do based on the current state.
//
switch(g_ui32State)
{
//
// The idle state.
//
case STATE_IDLE:
{
//
// There is nothing to be done.
//
break;
}
//
// The state for the middle of a burst write.
//
case STATE_WRITE_NEXT:
{
//
// Write the next data byte.
//
SoftI2CDataPut(&g_sI2C, *g_pui8Data++);
g_ui32Count--;
//
// Continue the burst write.
//
SoftI2CControl(&g_sI2C, SOFTI2C_CMD_BURST_SEND_CONT);
//
// If there is one byte left, set the next state to the final write
// state.
//
if(g_ui32Count == 1)
{
g_
