CONTIKI下CC2538 i2c回环测试的问题

2015-04-06 02:02:18 387 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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各位前辈前天做了一个CC2538往Contiki-OS下的i2c驱动移植，有TI的例程，按说例程怎么配置寄存器我就怎么配置，只是换了一个编程风格写寄存器而已。但是运行起来收不到发出的数据。之后一行一行的对照着例程查错误，并没有查出错误，实属无奈，现在贴出来，请大家帮忙。
下面是我的代码

/**

 * \file

 *         A very simple Contiki application about i2c

 */



#include "contiki.h"

#include "shell.h"

#include <stdio.h>              /* For printf() */

#include <string.h>

#include "sys/clock.h"

#include "dev/i2c.h"

#include "dev/serial-line.h"

#include "dev/sys-ctrl.h"

#include "dev/gpio.h"

#include "dev/ioc.h"

/*---------------------------------------------------------------------------*/

PROCESS(shell_i2c_process, "i2c");

SHELL_COMMAND(i2c_command,

              "i2c",

              "i2c: will start i2c test",

              &shell_i2c_process);

/*---------------------------------------------------------------------------*/

#define END '\n'

#define BUFSIZE 128

#define SLAVE_ADDRESS 0x3C



#if (BUFSIZE & (BUFSIZE - 1) != 0)

#error UART_BUFSIZE must be a power of two

#error Chang UART_BUFSIZE

#endif



int my_i2c_input(unsigned char c);

void i2c_loop_init(void);

void i2c_init(void);

void echo_m_stat(void);

void echo_s_stat(void);

char *txbuf;



void master_slave_loopback_test(void *);

/*---------------------------------------------------------------------------*/

PROCESS_THREAD(shell_i2c_process, ev, data)

{

  PROCESS_BEGIN();



  printf("Enter a string for I2C test \n");

  while (1) {

	PROCESS_WAIT_EVENT_UNTIL(ev == serial_line_event_message && data != NULL);

	master_slave_loopback_test(data);

	printf("end of transmission\n");

  }



  PROCESS_END();

}

/*---------------------------------------------------------------------------*/

void

shell_i2c_init(void)

{

  shell_register_command(&i2c_command);

}

/*---------------------------------------------------------------------------*/

void

i2c_loop_init(void)

{

  /* Enable clock for the I2C while Running */

  REG(SYS_CTRL_RCGCI2C) = 1;



  /* RESET of I2C module */

  REG(SYS_CTRL_SRI2C) = 1;



  GPIO_SET_INPUT(GPIO_PORT_TO_BASE(CC2538_I2C_SCL_PORT_NUM), GPIO_PIN_MASK(CC2538_I2C_SCL_PIN_NUM));

  GPIO_SET_INPUT(GPIO_PORT_TO_BASE(CC2538_I2C_SDA_PORT_NUM), GPIO_PIN_MASK(CC2538_I2C_SDA_PIN_NUM));

  /* Put all the I2C gpios into peripheral mode */

  GPIO_PERIPHERAL_CONTROL(GPIO_PORT_TO_BASE(CC2538_I2C_SCL_PORT_NUM), GPIO_PIN_MASK(CC2538_I2C_SCL_PIN_NUM));

  GPIO_PERIPHERAL_CONTROL(GPIO_PORT_TO_BASE(CC2538_I2C_SDA_PORT_NUM), GPIO_PIN_MASK(CC2538_I2C_SDA_PIN_NUM));

  /* Disable any pull ups or the like */

  ioc_set_over(CC2538_I2C_SCL_PORT_NUM, CC2538_I2C_SCL_PIN_NUM, IOC_OVERRIDE_DIS);

  ioc_set_over(CC2538_I2C_SDA_PORT_NUM, CC2538_I2C_SDA_PIN_NUM, IOC_OVERRIDE_DIS);

  

  /* Set the mux correctly to connect the I2C pins to the correct GPIO pins */

  /* input */

  REG(IOC_I2CMSSCL) = (CC2538_I2C_SCL_PORT_NUM << 3) + CC2538_I2C_SCL_PIN_NUM;

  REG(IOC_I2CMSSDA) = (CC2538_I2C_SDA_PORT_NUM << 3) + CC2538_I2C_SDA_PIN_NUM;

  /* output */

  ioc_set_sel(CC2538_I2C_SCL_PORT_NUM, CC2538_I2C_SCL_PIN_NUM, IOC_PXX_SEL_I2C_CMSSCL);

  ioc_set_sel(CC2538_I2C_SDA_PORT_NUM, CC2538_I2C_SDA_PIN_NUM, IOC_PXX_SEL_I2C_CMSSDA);

  

  /* enable LOOP */

  REG(I2CM_CR) |= I2CM_CR_LPBK;

  

  /* enable master mode */

  REG(I2CM_CR) |= I2CM_CR_MFE;    

  

  /* Configure the SCL 100Kbps */

  REG(I2CM_TPR) = 7;

  

  /* enable slave mode*/

  REG(I2CM_CR) |= I2CM_CR_SFE;

  REG(I2CS_CTRL) = I2CS_CTRL_DA;

  /* set slave own address */

  REG(I2CS_OAR) = SLAVE_ADDRESS;

  /* Tell the master module what address it will place on the bus */

  REG(I2CM_SA) = (SLAVE_ADDRESS << 1) | 0;

}

/*---------------------------------------------------------------------------*/

void

master_slave_loopback_test(void *data)

{

  static int i, j;

  static char *txbuf;

  static char rxbuf[128] = "";





  

  txbuf = (char *)data;

  i2c_loop_init();

  printf("\n\n\nI2C Loopback Example ->\n");

  printf("  Module = I2C\r\n");

  printf("  Mode = Single Send/Receive\n");

  printf("  Rate = 100kbps\n");

  printf("\nTranferring from: Master -> Slave\n");

  for (i = 0; i < strlen(txbuf); i++) {

	printf("  Sending: %c . . .", txbuf[i]);

	flush();

	/*send 1 byte*/

	REG(I2CM_DR) = txbuf[i];

	/* 发送命令让数据发出 */

	REG(I2CM_CTRL) = I2C_MASTER_CMD_SINGLE_SEND;

    /* 如果收到数据,从机拉低数据线拖延主机,如果没有收到,则等待 */

    while(!REG(I2CS_STAT) & I2C_SLAVE_ACT_RREQ)

      echo_s_stat();	

    rxbuf[i] = REG(I2CS_DR);

	printf("%c\n", rxbuf[i]);

  }

  printf("receive string: %s\n", rxbuf);

}

/*-------------------------------------------------------- */

void

echo_m_stat(void)

{

  static int stat;



  printf("master stat: \n");

  stat = REG(I2CM_STAT);

    if (stat & I2CM_STAT_BUSY) {

      printf("i2c_busy\n");

      return;

    }

  if (stat & I2CM_STAT_ERROR)

    printf("has error\n");

  if (stat & I2CM_STAT_BUSBSY)

    printf("i2c_bus_busy\n");

  if (stat & I2CM_STAT_IDLE)

    printf("i2c_idle\n");

  if (stat & I2CM_STAT_ARBLST)

    printf("lost arblst\n");

  if (stat & I2CM_STAT_DATACK)

    printf("send data not rev ack\n");

  if (stat & I2CM_STAT_ADRACK)

    printf("send address not rev ack\n");

}

/* ------------------------------------------------------- */

void

echo_s_stat(void)

{

  static int stat;



  printf("slave stat: \n");

  stat = REG(I2CS_STAT);

  if (stat & I2C_SLAVE_ACT_RREQ) {

    printf("master has sent data\n");

	if (stat & I2C_SLAVE_ACT_RREQ_FBR)

      printf("master has sent first byte\n");

}

  if (stat & I2C_SLAVE_ACT_TREQ)

    printf("mast has requested data\n");

}