[参考译文] TMS320F280049C：使用 EEPROM 的 I2C 外设

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

#include "i2cLib_FIFO_polling.h"

//
// Globals
//
struct I2CHandle EEPROM;

struct I2CHandle *currentMsgPtr;                   // Used in interrupt


uint16_t passCount = 0;
uint16_t failCount = 0;

uint16_t AvailableI2C_slaves[1];
uint16_t TX_MsgBuffer[MAX_BUFFER_SIZE];
uint16_t RX_MsgBuffer[MAX_BUFFER_SIZE];
uint32_t ControlAddr;
uint16_t status;


//void fail(void);
//void pass(void);

void I2C_GPIO_init(void);
void I2Cinit(void);
void verifyEEPROMRead(void);

//
// Main
//
void main(void)
{
    //
    // 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();

    //I2Cs connected to I2CA will be found in AvailableI2C_slaves buffer
    //after you run I2CBusScan function.
    uint16_t *pAvailableI2C_slaves = AvailableI2C_slaves;
    status = I2CBusScan(I2CA_BASE, pAvailableI2C_slaves);

    uint16_t i;

    for(i=0;i<MAX_BUFFER_SIZE;i++)
    {
        TX_MsgBuffer[i] = 0;
        RX_MsgBuffer[i] = 0;
    }

    EEPROM.SlaveAddr      = 0x50;
    EEPROM.base           = I2CA_BASE;
    EEPROM.pControlAddr   = &ControlAddr;
    EEPROM.NumOfAddrBytes = 1;
    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 = 0;
    EEPROM.NumOfDataBytes = 1;
    TX_MsgBuffer[0]       = 11;
//    TX_MsgBuffer[1]       = 11;
    status = I2C_MasterTransmitter(&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 = 0;
    EEPROM.pControlAddr   = &ControlAddr;
    EEPROM.NumOfDataBytes = 1;
    status = I2C_MasterReceiver(&EEPROM);

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

    verifyEEPROMRead();

//    //Example 3: EEPROM word (16-bit) write
//    //EEPROM address 0x1 = 22 &  0x2 = 33
//    ControlAddr = 1;   //EEPROM address to write
//    EEPROM.NumOfDataBytes  = 2;
//    TX_MsgBuffer[0]        = 0x11;
//    TX_MsgBuffer[1]        = 0x22;
//    EEPROM.pTX_MsgBuffer   = TX_MsgBuffer;
//    status = I2C_MasterTransmitter(&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 4: EEPROM word (16-bit) read
//     //Make sure EEPROM address 1 has 0x11 and 2 has 0x22
//     ControlAddr = 1;
//     EEPROM.pControlAddr   = &ControlAddr;
//     EEPROM.pRX_MsgBuffer  = RX_MsgBuffer;
//     EEPROM.NumOfDataBytes = 2;
//
//     status = I2C_MasterReceiver(&EEPROM);
//
//     verifyEEPROMRead();

//
//    //Example 5: EEPROM Page write
//    //Program address = data pattern from address 64
//
//    for(i=0;i<MAX_BUFFER_SIZE;i++)
//    {
//        TX_MsgBuffer[i] = i+64;
//    }
//
//    ControlAddr = 4;   //EEPROM address to write
//    EEPROM.NumOfDataBytes  = MAX_BUFFER_SIZE;
//    EEPROM.pTX_MsgBuffer   = TX_MsgBuffer;
//    status = I2C_MasterTransmitter(&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 6: EEPROM word Paged read
//    ControlAddr = 4;
//    EEPROM.pControlAddr   = &ControlAddr;
//    EEPROM.pRX_MsgBuffer  = RX_MsgBuffer;
//    EEPROM.NumOfDataBytes = MAX_BUFFER_SIZE;
//
//    status = I2C_MasterReceiver(&EEPROM);
//
//    verifyEEPROMRead();
//
    if(status)
    {
        fail();
    }
    else
    {
        pass();
    }

}

//
// 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(EEPROM.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();
        }
    }
}


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_initMaster(I2CA_BASE, DEVICE_SYSCLK_FREQ, 400000, I2C_DUTYCYCLE_50);
    I2C_setConfig(I2CA_BASE, I2C_MASTER_SEND_MODE);
    I2C_setSlaveAddress(I2CA_BASE, 0x50);
    I2C_setOwnSlaveAddress(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_RX12);
    I2C_enableInterrupt(I2CA_BASE, I2C_INT_ADDR_SLAVE | I2C_INT_ARB_LOST | I2C_INT_NO_ACK | I2C_INT_STOP_CONDITION);
    I2C_setEmulationMode(I2CA_BASE, I2C_EMULATION_FREE_RUN);
    I2C_enableModule(I2CA_BASE);
}

//
// End of File
//