MSP430F5529 DriverLib 库函数I2C驱动OLED屏幕

平台：Code Composer Studio 10.4.0

MSP430F5529 LaunchPad™ Development Kit

(MSP‑EXP430F5529LP)

I2C驱动代码

P3.0为SDA，P3.1为SCL

MSP430F5529_I2C.c

#include "driverlib.h"

#define I2C_USCI_BASE USCI_B0_BASE

#define I2C_USCI_VECTOR USCI_B0_VECTOR

#define I2C_USCI_IV UCB0IV

#define I2C_BUF_LENGTH 32

static char i2c_buf[I2C_BUF_LENGTH];

static uint8_t i2c_buf_len = 0;

static uint8_t i2c_buf_cur = 0;

static uint8_t *i2c_rx_buf = 0;

static uint8_t i2c_rx_buf_len = 0;

void Init_I2C_GPIO(void)

{

    /* Select I2C function for I2C_SDA & I2C_SCL */

    GPIO_setAsPeripheralModuleFunctionOutputPin(

            GPIO_PORT_P3,

            GPIO_PIN0 | GPIO_PIN1);

}

/***************************************************************************//**

 * @brief  Configures I2C

 * @param  none

 * @return none

 ******************************************************************************/

void I2C_init(uint8_t slaveAddress)

{

  /* I2C Master Configuration Parameter */

  USCI_B_I2C_initMasterParam i2cConfig =

  {

    USCI_B_I2C_CLOCKSOURCE_SMCLK,

    UCS_getSMCLK(),

    USCI_B_I2C_SET_DATA_RATE_400KBPS

  };

  /* Initialize USCI_B0 and I2C Master to communicate with slave devices*/

  USCI_B_I2C_initMaster(I2C_USCI_BASE, &i2cConfig);

  /* Enable I2C Module to start operations */

  USCI_B_I2C_enable(I2C_USCI_BASE);

  // Specify slave address

  USCI_B_I2C_setSlaveAddress(I2C_USCI_BASE, slaveAddress);

  USCI_B_I2C_clearInterrupt(I2C_USCI_BASE, USCI_B_I2C_RECEIVE_INTERRUPT);

  USCI_B_I2C_enableInterrupt(I2C_USCI_BASE, USCI_B_I2C_RECEIVE_INTERRUPT);

  USCI_B_I2C_clearInterrupt(I2C_USCI_BASE, USCI_B_I2C_TRANSMIT_INTERRUPT);

  USCI_B_I2C_enableInterrupt(I2C_USCI_BASE, USCI_B_I2C_TRANSMIT_INTERRUPT);

    return;

}

/* write a byte to specific register, cannot called in interrupt context */

void writeByte(uint8_t byte)

{

    while (USCI_B_I2C_isBusBusy(I2C_USCI_BASE));

    USCI_B_I2C_setMode(I2C_USCI_BASE, USCI_B_I2C_TRANSMIT_MODE);

    // Initiate start and send first character

    i2c_buf[0] = byte;

    i2c_buf_cur = 1;

    i2c_buf_len = 1;

    USCI_B_I2C_masterSendMultiByteStart(I2C_USCI_BASE, i2c_buf[0]);

    // wait for end

    __bis_SR_register(GIE + LPM0_bits);

    __no_operation();

}

/* write a word to specific register, cannot called in interrupt context */

void writeWord(uint16_t word)

{

    while (USCI_B_I2C_isBusBusy(I2C_USCI_BASE));

    USCI_B_I2C_setMode(I2C_USCI_BASE, USCI_B_I2C_TRANSMIT_MODE);

    // Initiate start and send first character

    i2c_buf[0] = word >> 8;

    i2c_buf[1] = (uint8_t)word;

    i2c_buf_cur = 1;

    i2c_buf_len = 2;

    USCI_B_I2C_masterSendMultiByteStart(I2C_USCI_BASE, i2c_buf[0]);

    // wait for end

    __bis_SR_register(GIE + LPM0_bits);

    __no_operation();

}

///* set/clear some bit to specific register, cannot called in interrupt context */

//void writeBit(uint8_t regAddr, uint8_t bitNum, uint8_t data)

//{

//    uint8_t b = 0;

//    readByte(regAddr, &b);

//    delay_ms(2);

//    b = (data != 0) ? (b | (1 << bitNum)) : (b & ~(1 << bitNum));

//    writeByte(regAddr, b);

//}

/* read some byte from specific register, cannot called in interrupt context */

void readByte(uint8_t RegAddr, uint8_t* b)

{

while (USCI_B_I2C_isBusBusy(I2C_USCI_BASE));

    // send address

    USCI_B_I2C_setMode(I2C_USCI_BASE, USCI_B_I2C_TRANSMIT_MODE);

    i2c_buf_cur = 1;

    i2c_buf_len = 1;

    USCI_B_I2C_masterSendSingleByte(I2C_USCI_BASE, RegAddr);

    // receive

    USCI_B_I2C_setMode(I2C_USCI_BASE, USCI_B_I2C_RECEIVE_MODE);

    i2c_rx_buf = b;

    i2c_rx_buf_len = 1;

    USCI_B_I2C_masterReceiveSingleStart(I2C_USCI_BASE);

//     wait for end

    __bis_SR_register(GIE + LPM0_bits);

    __no_operation();

}

void readBytes(uint8_t RegAddr, uint8_t length, uint8_t* data)

{

while (USCI_B_I2C_isBusBusy(I2C_USCI_BASE));

    // send address

    USCI_B_I2C_setMode(I2C_USCI_BASE, USCI_B_I2C_TRANSMIT_MODE);

    i2c_buf_cur = 1;

    i2c_buf_len = 1;

    USCI_B_I2C_masterSendSingleByte(I2C_USCI_BASE, RegAddr);

    // receive

    USCI_B_I2C_setMode(I2C_USCI_BASE, USCI_B_I2C_RECEIVE_MODE);

    i2c_rx_buf = data;

    i2c_rx_buf_len = length;

    USCI_B_I2C_masterReceiveMultiByteStart(I2C_USCI_BASE);

    // wait for end

    __bis_SR_register(GIE + LPM0_bits);

    __no_operation();

}

#pragma vector = I2C_USCI_VECTOR

__interrupt void USCI_B0_ISR(void)

{

    switch (__even_in_range(I2C_USCI_IV, 12))

    {

        case USCI_I2C_UCTXIFG:

            if (i2c_buf_cur < i2c_buf_len)

            {

                USCI_B_I2C_masterSendMultiByteNext( I2C_USCI_BASE, i2c_buf[i2c_buf_cur]);

                i2c_buf_cur++;

            }

            else

            {

                USCI_B_I2C_masterSendMultiByteStop(I2C_USCI_BASE);

                //Clear master interrupt status

                USCI_B_I2C_clearInterrupt(I2C_USCI_BASE,

                                          USCI_B_I2C_TRANSMIT_INTERRUPT);

                __bic_SR_register_on_exit(LPM0_bits);

            }

            break;

        case USCI_I2C_UCRXIFG:

            i2c_rx_buf_len--;

            if(i2c_rx_buf_len)

            {

                if(i2c_rx_buf_len== 1)

                {

                    //Initiate end of reception -> Receive byte with NAK

                    *i2c_rx_buf++ = USCI_B_I2C_masterReceiveMultiByteFinish( I2C_USCI_BASE);

                }

                else

                {

                    //Keep receiving one byte at a time

                    *i2c_rx_buf++ = USCI_B_I2C_masterReceiveMultiByteNext( I2C_USCI_BASE);

                }

            }

            else

            {

                //Receive last byte

                *i2c_rx_buf= USCI_B_I2C_masterReceiveMultiByteNext(I2C_USCI_BASE);

                __bic_SR_register_on_exit(LPM0_bits);

            }

            break;

    }

}

MSP430F5529_I2C.h

#ifndef MSP430F5529_I2C_H_

#define MSP430F5529_I2C_H_

void Init_I2C_GPIO(void);

void I2C_init(uint8_t slaveAddress);

void writeByte(uint8_t byte);

void writeWord(uint16_t word);

void readByte(uint8_t RegAddr, uint8_t* b);

void readBytes(uint8_t RegAddr, uint8_t length, uint8_t* data);

#endif /* MSP430F5529_I2C_H_ */

OLED初始化及测试

#include "driverlib.h"

#include "MSP430F5529_I2C.h"

#include "./OLED/OLED.h"

#define MCLK_IN_HZ      25000000

#define delay_us(x)     __delay_cycles((MCLK_IN_HZ/1000000*(x)))

#define delay_ms(x)     __delay_cycles((MCLK_IN_HZ/1000*(x)))

void SystemClock_Init(void)

{

    PMM_setVCore(PMM_CORE_LEVEL_3);     //高主频工作需要较高的核心电压

    //XT1引脚复用

    GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P5, GPIO_PIN4);

    GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P5, GPIO_PIN5);

    //起振XT1

    UCS_turnOnLFXT1(UCS_XT1_DRIVE_3,UCS_XCAP_3);

    //XT2引脚复用

    GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P5, GPIO_PIN2);

    GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P5, GPIO_PIN3);

    //起振XT2

    UCS_turnOnXT2(UCS_XT2_DRIVE_4MHZ_8MHZ);

    //XT2作为FLL参考时钟，先8分频，再50倍频 4MHz / 8 * 50 = 25MHz

    UCS_initClockSignal(UCS_FLLREF, UCS_XT2CLK_SELECT, UCS_CLOCK_DIVIDER_8);

    UCS_initFLLSettle(25000, 50);

    //XT1作为ACLK时钟源 = 32768Hz

    UCS_initClockSignal(UCS_ACLK, UCS_XT1CLK_SELECT, UCS_CLOCK_DIVIDER_1);

    //DCOCLK作为MCLK时钟源 = 25MHz

    UCS_initClockSignal(UCS_MCLK, UCS_DCOCLK_SELECT, UCS_CLOCK_DIVIDER_1);

    //DCOCLK作为SMCLK时钟源 = 25MHz

    UCS_initClockSignal(UCS_SMCLK, UCS_DCOCLK_SELECT, UCS_CLOCK_DIVIDER_1);

    //设置外部时钟源的频率，使得在调用UCS_getMCLK, UCS_getSMCLK 或 UCS_getACLK时可得到正确值

    UCS_setExternalClockSource(32768, 4000000);

}

int main(void)

{

    WDT_A_hold(WDT_A_BASE);

    SystemClock_Init();

    Init_I2C_GPIO();

    I2C_init(OLED_ADDRESS >> 1);

    __bis_SR_register(GIE);

OLED_Init();

OLED_Clear();

OLED_Display_On();