[参考译文] LAUNCHXL-F280025C：支持 F280025C 的 EEPROM AT24Cxx 分线板接口

#include "driverlib.h"
#include "device.h"
#include "i2cLib_FIFO_polling.h"

//
// Defines
//
#define EEPROM_ADDR 0x50

//
// Globals
//
struct I2CHandle EEPROM;

uint16_t TX_MsgBuffer[MAX_BUFFER_SIZE];
uint16_t RX_MsgBuffer[MAX_BUFFER_SIZE];
uint32_t ControlAddr;
uint16_t status;

void I2C_GPIO_init(void)
{
    // I2CA pins (SDAA / SCLA)
    GPIO_setDirectionMode(DEVICE_GPIO_PIN_SDAA, GPIO_DIR_MODE_IN);
    GPIO_setPadConfig(DEVICE_GPIO_PIN_SDAA, GPIO_PIN_TYPE_PULLUP);
    GPIO_setQualificationMode(DEVICE_GPIO_PIN_SDAA, GPIO_QUAL_ASYNC);

    GPIO_setDirectionMode(DEVICE_GPIO_PIN_SCLA, GPIO_DIR_MODE_IN);
    GPIO_setPadConfig(DEVICE_GPIO_PIN_SCLA, GPIO_PIN_TYPE_PULLUP);
    GPIO_setQualificationMode(DEVICE_GPIO_PIN_SCLA, GPIO_QUAL_ASYNC);

    GPIO_setPinConfig(DEVICE_GPIO_CFG_SDAA);
    GPIO_setPinConfig(DEVICE_GPIO_CFG_SCLA);
}

void I2Cinit(void)
{
    //myI2CA initialization
    I2C_disableModule(I2CA_BASE);
    I2C_initController(I2CA_BASE, DEVICE_SYSCLK_FREQ, 100000, I2C_DUTYCYCLE_50);
    I2C_setConfig(I2CA_BASE, I2C_CONTROLLER_SEND_MODE);
    I2C_setTargetAddress(I2CA_BASE, 0x50);
//    I2C_setOwnAddress(I2CA_BASE, 96); //I2CA address
    I2C_disableLoopback(I2CA_BASE);
    I2C_setBitCount(I2CA_BASE, I2C_BITCOUNT_8);
    I2C_setDataCount(I2CA_BASE, 2);
    I2C_setAddressMode(I2CA_BASE, I2C_ADDR_MODE_7BITS);
    I2C_enableFIFO(I2CA_BASE);
    I2C_clearInterruptStatus(I2CA_BASE, I2C_INT_ARB_LOST | I2C_INT_NO_ACK);
    I2C_setFIFOInterruptLevel(I2CA_BASE, I2C_FIFO_TXEMPTY, I2C_FIFO_RX2);
    I2C_enableInterrupt(I2CA_BASE, I2C_INT_ADDR_TARGET | I2C_INT_ARB_LOST | I2C_INT_NO_ACK | I2C_INT_STOP_CONDITION);
    I2C_setEmulationMode(I2CA_BASE, I2C_EMULATION_FREE_RUN);
    I2C_enableModule(I2CA_BASE);
}

//
// pass - Function to be called if data written matches data read
//
void
pass(void)
{
    asm("   ESTOP0");
    for(;;);
}

//
// fail - Function to be called if data written does NOT match data read
//
void fail(void)
{
    asm("   ESTOP0");
    for(;;);
}
void verifyEEPROMRead(void)
{
    uint16_t i;
    while(I2C_getStatus(I2CA_BASE) & I2C_STS_BUS_BUSY);

    for(i=0;i<EEPROM.NumOfDataBytes;i++)
    {
        if(RX_MsgBuffer[i] != TX_MsgBuffer[i])
        {
            //Transmitted data doesn't match received data
            //Fail condition. PC shouldn't reach here
            ESTOP0;
            fail();
        }
    }
}
//
// Main
//
void main()
{
    volatile int status = 0;

    uint16_t i;

    //
    // Initialize device clock and peripherals
    //
    Device_init();

    //
    // Disable pin locks and enable internal pullups.
    //
    Device_initGPIO();

    //
    // Initialize I2C pins
    //
    I2C_GPIO_init();

    //
    // Initialize PIE and clear PIE registers. Disable CPU interrupts.
    //
    Interrupt_initModule();

    //
    // Initialize the PIE vector table with pointers to the shell Interrupt
    // Service Routines (ISR).
    //
    Interrupt_initVectorTable();

    I2Cinit();
    EEPROM.TargetAddr      = 0x50;
    EEPROM.base           = I2CA_BASE;
    EEPROM.pControlAddr   = &ControlAddr;
    EEPROM.NumOfAddrBytes = 2;
    EEPROM.pTX_MsgBuffer  = TX_MsgBuffer;
    EEPROM.pRX_MsgBuffer  = RX_MsgBuffer;
    EEPROM.NumOfAttempts  = 5;
    EEPROM.Delay_us       = 10;
    EEPROM.WriteCycleTime_in_us = 6000;    //10ms for EEPROM this code was tested

    //Example 1: EEPROM Byte Write
    //Write 11 to EEPROM address 0x0
    ControlAddr = 0x01;
    EEPROM.NumOfDataBytes = 1;
    TX_MsgBuffer[0]       = 11;

    status = I2C_ControllerTransmitter(&EEPROM);

    //Wait for EEPROM write cycle time
    //This delay is not mandatory. User can run their application code instead.
    //It is however important to wait for EEPROM write cycle time before you initiate
    //another read / write transaction
    DEVICE_DELAY_US(EEPROM.WriteCycleTime_in_us);

    //Example 2: EEPROM Byte Read
    //Make sure 11 is written to EEPROM address 0x0
    ControlAddr = 0x01;
    EEPROM.pControlAddr   = &ControlAddr;
    EEPROM.NumOfDataBytes = 1;
    status = I2C_ControllerReceiver(&EEPROM);

    while(I2C_getStatus(EEPROM.base) & I2C_STS_BUS_BUSY);

    verifyEEPROMRead();
}