[参考译文] CC2543：LIS2DE12TR 的 I2C 通信问题

这是示例代码..........

#include <hal_types.h>
// Include Name definitions of individual bits and bit-fields in the CC254x device registers.
#include <ioCC254x_bitdef.h>
// Include device specific file
#if (chip==2541)
#include "ioCC2541.h"   
#elif (chip==2543)
#include "ioCC2543.h"
#elif (chip==2545)
#include "ioCC2545.h"
#else
#error "Chip not supported!"
#endif


/***********************************************************************************
* CONSTANTS
*/

// Define size of buffer and number of bytes to send
#define BUFFER_SIZE 0xFF
#define SLAVE_ADDRESS 0x53    // 7-bit addressing

#define READ_FROM_SLAVE 0x01
#define WRITE_TO_SLAVE 0x00


/***********************************************************************************
* LOCAL VARIABLES
*/

// Masters's transmit buffer.
static uint8 buffer[BUFFER_SIZE];
static uint16 bufferIndex = 0;


/***********************************************************************************
* LOCAL FUNCTIONS
*/

/***********************************************************************************
* @fn          I2C_ISR
*
* @brief       Function which sends the next I2C data byte.
*
* @param       none
*
* @return      0
*/
#pragma vector = I2C_VECTOR
__interrupt void I2C_ISR(void)
{ 
#if(chip==2541)
    // Clear I2C CPU interrupt flag.
    P2IF = 0;
#else
    // Clear I2C CPU interrupt flag.
    I2CIF = 0;
#endif
  
    // If a Start or Restart condition has been transmitted ...
    if (I2CSTAT == 0x08 || I2CSTAT == 0x10)
    {
        // Send Slave address and R/W access.
        I2CDATA = (SLAVE_ADDRESS << 1) | READ_FROM_SLAVE;
    
        // End Start condition.
        I2CCFG &= ~I2CCFG_STA;
    }

    // If a Data byte has been received and acknowledge has been returned...
    else if (I2CSTAT == 0x50)
    {
        // Read Data byte.
        buffer[bufferIndex++] = I2CDATA;
    }
  
    // If finished receiving...
    if (bufferIndex >= BUFFER_SIZE )
    {
        // Generate Stop condition.
        I2CCFG |= I2CCFG_STO;

#if(chip==2541)
        // Disable interrupt from I2C by setting [IEN2.I2CIE = 0].
        IEN2 &= ~IEN2_P2IE;
#elif(chip==2543 || chip==2545)
        // Disable interrupt from I2C by setting [IEN2.I2CIE = 0].
        IEN2 &= ~IEN2_I2CIE;
#endif
    
        // Set SRF05EB LED1.
        P1_0 = 1;  
    }

    // I2CCFG.SI flag must be cleared by software at the end of the ISR.
    I2CCFG &= ~I2CCFG_SI;
}


/***********************************************************************************
* @fn          main
*
* @brief       Send data to a single slave using I2C in Master mode
*
* @param       void
*
* @return      0
*/
int main(void)
{
    /****************************************************************************
    * Clock setup
    * See basic software example "clk_xosc_cc254x"
    */
  
    // Set system clock source to HS XOSC, with no pre-scaling.
    CLKCONCMD = (CLKCONCMD & ~(CLKCON_OSC | CLKCON_CLKSPD)) | CLKCON_CLKSPD_32M;
    // Wait until clock source has changed.
    while (CLKCONSTA & CLKCON_OSC);
  
    // Note the 32 kHz RCOSC starts calibrating, if not disabled.

#if (chip==2543)
    /***************************************************************************
    * Setup I/O ports
    *
    * Port and pins used by I2C, at the alternative 1 location:
    * I2C SCL:   P0_6    (Debug Connector P18_5)
    * I2C SDA:   P0_7    (Debug Connector P18_3)
    */

    // Configure I2C for location Alternative 1.
    PERCFG &= ~PERCFG_I2CCFG;
  
    // Give priority to I2C over Timer 1 for port 0 pins.
    PPRI &= ~PPRI_PRI1P0;

    // Set P0_6 and P0_7 as peripheral I/O.
    P0SEL |= BIT7 | BIT6;

#elif(chip==2545)
    /***************************************************************************
    * Setup I/O ports
    *
    * Port and pins used by I2C, at the alternative 2 location:
    * I2C SCL:   P2_5    (Debug Connector P18_5)
    * I2C SDA:   P2_6    (Debug Connector P18_3)
    */

    // Configure I2C for location Alternative 2.
    PERCFG |= PERCFG_I2CCFG;
   
    // Give priority to I2C over USART0, then Timer3.
    PPRI = (PPRI & ~PPRI_PRI1P1) | PPRI_PRI1P1_I2C;

    // Set P2_5 and P2_6 as peripheral I/O.
    P2SEL |= BIT6 | BIT5;
  
#elif(chip==2541)
    /***************************************************************************
    * Setup I/O ports
    *
    * CC2541 has dedicated I2C ports
    * I2C SCL:   Pin 2   (Debug Connector P18_5)
    * I2C SDA:   Pin 3   (Debug Connector P18_3)
    */

    // Enable I2C on CC2541.
    I2CWC &= ~0x80;
#endif

    // Configure P1_0 as GPIO output for LED1.
    P1SEL &= BIT0;      // GPIO.
    P1DIR |= BIT0;      // Output.
    P1_0 = 0;           // LED1 off.


  /***************************************************************************
  * Setup interrupt
  */

#if(chip==2541)
    // Clear I2C (P2) CPU interrupt flag.
    P2IF = 0;

    // Enable interrupt from I2C by setting [IEN2.P2IE = 1].
    IEN2 |= IEN2_P2IE;
#elif(chip==2543 || chip==2545)
    // Clear I2C CPU interrupt flag.
    I2CIF = 0;

    // Enable interrupt from I2C by setting [IEN2.I2CIE = 1].
    IEN2 |= IEN2_I2CIE;
#endif

    // Enable global interrupts.
    EA = 1;


    /***************************************************************************
    * Configure I2C
    */

    // Enable the I2C module with 33 kHz clock rate.
    // Enable Assert Acknowledge (AA bit).
    // The STArt bit signals a master.
    I2CCFG = (I2CCFG & ~I2CCFG_CR) | I2CCFG_CR_DIV_960 | I2CCFG_ENS1 | I2CCFG_AA | I2CCFG_STA;


    /* Main Loop, the transfers are interrupt handled. */
    while(1);

}

您好 Dharmendra、

您需要进一步熟悉  LIS2DE12TR 、并使用逻辑分析仪/示波器确保 I2C 接口遵循数据表中定义的时序图和格式。  同一数据表还应包含正确的 SLAVE_ADDRESS 值以及 有关 LIS2DE12TR 根据 给定命令给出的响应的更多信息。  请确保也使用了正确的外部上拉电阻器、并且在 ISR 结束时由软件清除 I2CCFG.SI 标志。

此致、
Ryan

谢谢 Ryan

您能给我推荐 CC2543的 I2C 示例吗？
CC2543可与任何 I2C 传感器通信并读取 传感器寄存器、无论是否使用库。

感谢 Ryan 的帮助和快速回复。。