[讨论] 【LPC54100】LPC54102的硬件i2c读取mpu6050问题

/*
* @brief I2CM bus master example using polling mode
*
* @note
* Copyright(C) NXP Semiconductors, 2014
* All rights reserved.
*
* @par
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* LPC products.  This software is supplied "AS IS" without any warranties of
* any kind, and NXP Semiconductors and its licensor disclaim any and
* all warranties, express or implied, including all implied warranties of
* merchantability, fitness for a particular purpose and non-infringement of
* intellectual property rights.  NXP Semiconductors assumes no responsibility
* or liability for the use of the software, conveys no license or rights under any
* patent, copyright, mask work right, or any other intellectual property rights in
* or to any products. NXP Semiconductors reserves the right to make changes
* in the software without notification. NXP Semiconductors also makes no
* representation or warranty that such application will be suitable for the
* specified use without further testing or modification.
*
* @par
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, under NXP Semiconductors' and its
* licensor's relevant copyrights in the software, without fee, provided that it
* is used in conjunction with NXP Semiconductors microcontrollers.  This
* copyright, permission, and disclaimer notice must appear in all copies of
* this code.
*/

#include "board.h"
#include

/** @defgroup I2CM_POLLING_5410X I2C master (blocking/polling mode) ROM API example
* @ingroup EXAMPLES_ROM_5410X
* @include "rom\i2cm_polling\readme.txt"
*/

/**
* @}
*/

/*****************************************************************************
* Private types/enumerations/variables
****************************************************************************/

/* 400KHz I2C bit-rate */
#define I2C_BITRATE         (400000)

/** I2C interface setup */
#define I2C_ADDR_7BIT       (0xd0)//
#define LPC_I2C_PORT         LPC_I2C2///LPC_I2C0
#define LPC_I2CM_CLOCK              SYSCON_CLOCK_I2C2///SYSCON_CLOCK_I2C0
#define LPC_I2CM_RESET              RESET_I2C2///RESET_I2C0

/* ROM driver handle for I2C master */
static ROM_I2CM_HANDLE_T i2cmHandle;

/* I2C driver context area */
static uint32_t drvData[16];

/*****************************************************************************
* Public types/enumerations/variables
****************************************************************************/

/* Made global so data can be seen in the debuuger */
uint8_t rx[10], tx[4];
uint32_t actualRate;
ROM_I2CM_XFER_T mXfer;

/*****************************************************************************
* Private functions
****************************************************************************/

/* Initializes pin muxing for I2C interface - note that SystemInit() may
   already setup your pin muxing at system startup */
static void Init_I2C_PinMux(void)
{Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 27, (IOCON_FUNC1 | IOCON_DIGITAL_EN));//23        /* I2C0 */
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 28, (IOCON_FUNC1 | IOCON_DIGITAL_EN));///
#if defined(BOARD_NXP_LPCXPRESSO_54102)
        /* Connect the I2C_SDA and I2C_SCL signals to port pins */
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 27, (IOCON_FUNC1 | IOCON_DIGITAL_EN));//23        /* I2C0 */
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 28, (IOCON_FUNC1 | IOCON_DIGITAL_EN));///24        /* I2C0 */

#else
        /* Configure your own I2C pin muxing here if needed */
#warning "No I2C pin muxing defined"
#endif
}

/* Display error string and spin */
static void errorOut(char *errStr)
{
        DEBUGOUT(errStr);
        while (1) {}
}

/*****************************************************************************
* Public functions
****************************************************************************/

/**
* @brief        Main routine for I2C example
* @return        Function should not exit
*/
int main(void)
{
        uint32_t memSize, *devMem;
        ROM_I2CM_INIT_T i2cmInit;

        /* Generic Initialization */
        SystemCoreClockUpdate();
        Board_Init();

        /* Setup I2C pin muxing, enable I2C clock and reset I2C peripheral */
        Init_I2C_PinMux();
        Chip_Clock_EnablePeriphClock(LPC_I2CM_CLOCK);
        Chip_SYSCON_PeriphReset(LPC_I2CM_RESET);

        /* Get needed size for driver context memory */
        memSize = ROM_I2CM_GetMemSize();
        if (memSize > sizeof(drvData)) {
                errorOut("Can't allocate memory for I2C driver context\r\n");
        }
        devMem = drvData;        /* Or just use malloc(memSize) */

        /* Initialize driver */
        i2cmInit.pUserData = NULL;
        i2cmInit.base = (uint32_t) LPC_I2C_PORT;
        i2cmHandle = ROM_I2CM_Init(devMem, &i2cmInit);
        if (i2cmHandle == NULL) {
                /* Error initializing I2C */
                errorOut("Error initializing ROM\r\n");
        }

        /* Set I2C clock rate */
        actualRate = ROM_I2CM_SetClockRate(i2cmHandle,
                        Chip_Clock_GetAsyncSyscon_ClockRate(), I2C_BITRATE);
        ///DEBUGOUT("Actual I2C master rate = %dHz\r\n", actualRate);

        /* Read data as fast as possible in loop */
        while (1) {
                /* Write address, write 1 btye, read 8 bytes back */
                mXfer.slaveAddr = I2C_ADDR_7BIT;
                tx[0] = 0x6b;
                tx[1] = 0x00;
                mXfer.txBuff = tx;
                mXfer.rxBuff = rx;
                mXfer.txSz = 2;
                mXfer.rxSz = 1;

                /* I2C master driver will block if blocking flag is used */
                mXfer.flags = ROM_I2CM_FLAG_BLOCKING;

                /* Start transfer and wait for completion */
                ROM_I2CM_Transfer(i2cmHandle, &mXfer);

                /* Check status of the transfer */
                DEBUGOUT("I2C transfer completed: status = %x\r\n", mXfer.status);
                if (mXfer.status != LPC_OK) {
                        errorOut("Error during I2CM transfer\r\n");
                }
        }

        /* Code never reaches here. Only used to satisfy standard main() */
        return 0;
}
在官方的例程修改！原来使用i2c0,修改为i2c2,问题不能正常访问这个端口啊！

主要点 /* 400KHz I2C bit-rate */ #define I2C_BITRATE (400000) /** I2C interface setup */ #define I2C_ADDR_7BIT (0xd0)// #define LPC_I2C_PORT LPC_I2C2///LPC_I2C0 #define LPC_I2CM_CLOCK SYSCON_CLOCK_I2C2///SYSCON_CLOCK_I2C0 #define LPC_I2CM_RESET RESET_I2C2///RESET_I2C0 mXfer.slaveAddr = I2C_ADDR_7BIT; tx[0] = 0x6b; tx[1] = 0x00; mXfer.txBuff = tx; mXfer.rxBuff = rx; mXfer.txSz = 2; mXfer.rxSz = 0; 程序报错if (mXfer.status != LPC_OK) { errorOut("Error during I2CM transfer\r\n"); } 本帖最后由 大秦正声 于 2015-4-17 10:01 编辑

建议楼主把出现的问题描述放到帖子开头，看前面以为水帖哩

找到问题了！地址设定错误原以为是0xd0 (模拟i2c接口)
#define I2C_ADDR_7BIT       (0x68)//硬件接口

nxp硬件i2c好用啊！

i2c封装的很简单易用！

确实，i2c超级好用，之前玩st的时候就没成功弄出来，nxp的太方便了。。。

库封装的太厉害，效率很低，而且没有用超时