IIC读RTC

2万 · 2016-10-15 17:05

int PCF8563Read(unsigned char address,unsigned char *pbuf,int number)
{
      int i;
      //
      // Specify slave address
      // 0xA3  --> read
      // 0xA2  --> write
      //
      I2CMasterSlaveAddrSet(I2C_MASTER_BASE, 0x51, false);
      //
      // Place the character to be sent in the data register
      //
      I2CMasterDataPut(I2C_MASTER_BASE,address);
      //
      // Initiate send of character from Master to Slave
      //
      I2CMasterControl(I2C_MASTER_BASE,  I2C_MASTER_CMD_BURST_SEND_START);
      //
      // Delay until transmission completes
      //
      while(I2CMasterBusy(I2C_MASTER_BASE));
      //指定从机地址
      I2CMasterSlaveAddrSet(I2C_MASTER_BASE, 0x51, true);
      //Initiate send character from Slave to Master
      // 读取数据命令
      I2CMasterControl(I2C_MASTER_BASE,  I2C_MASTER_CMD_BURST_RECEIVE_START);

      //
      // Delay until transmission completes
      //
      for(i = 0; i < number-1; i++)
      {
               while(I2CMasterBusy(I2C_MASTER_BASE));
               *pbuf++ = (unsigned char)I2CMasterDataGet(I2C_MASTER_BASE);
               I2CMasterControl(I2C_MASTER_BASE,  I2C_MASTER_CMD_BURST_RECEIVE_CONT);
      }
      //发送一个停止位
      while(I2CMasterBusy(I2C_MASTER_BASE));
      *pbuf++ = (unsigned char)I2CMasterDataGet(I2C_MASTER_BASE);
      I2CMasterControl(I2C_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
      while(I2CMasterBusBusy(I2C_MASTER_BASE));       return i;
}

2万 · 2016-10-15 17:06

使用IIC外挂一个RTCCF8563T，程序运行了好几天，发现出现CPU停在最后的一个while循环

1万 · 2016-10-15 17:08

先确定硬件问题还是软件问题

1万 · 2016-10-15 17:11

没用过LM3S6965，等看结果。

2万 · 2016-10-15 17:13

补充一下：
IIC只挂一个设备，就PCF8563T。

1万 · 2016-10-15 17:15

#define BSP_I2C_MODULE
#include <bsp.h>

/*
*********************************************************************************************************
*                                           LOCAL DEFINES
*********************************************************************************************************
*/

#define  LM3SXXXX_BASE_I2C0                   0x40020000uL
#define  LM3SXXXX_BASE_I2C1                   0x40021000uL

/*
*********************************************************************************************************
*                                     REGISTER BIT DEFINES
*********************************************************************************************************
*/
/*********************************************************************
                        总线地址分配
*********************************************************************/
#define PCF8563ADDR    0x51       //PCF8563器件地址，默认为1010001x

/*********************************************************************
                        PCF8563寄存器定义
*********************************************************************/
#define PCF8563CTRL0 0x00       //PCF8563控制状态寄存器0
#define PCF8563CTRL1 0x01       //PCF8563控制状态寄存器1
#define PCF8563SECOND 0x02       //PCF8563秒(欠压)寄存器
#define PCF8563MINUTE 0x03       //PCF8563分钟寄存器
#define PCF8563HOUR    0x04       //PCF8563小时寄存器
#define PCF8563DAY    0x05       //PCF8563日寄存器
#define PCF8563WEEK    0x06       //PCF8563星期寄存器
#define PCF8563MONTH 0x07       //PCF8563月(世纪)寄存器
#define PCF8563YEAR    0x08       //PCF8563年寄存器

/*
*********************************************************************************************************
*                                        LOCAL CONSTANTS
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*                                        LOCAL DATA TYPES
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*                                           LOCAL TABLES
*********************************************************************************************************
*/

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

/*
*********************************************************************************************************
*                                     LOCAL FUNCTION PROTOTYPES
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*                                  LOCAL CONFIGURATION ERRORS
*********************************************************************************************************
*/

void PCF8563Write(unsigned char addr,unsigned char data)
{

// Specify slave address  指定从机地址

I2CMasterSlaveAddrSet(I2C1_MASTER_BASE, PCF8563ADDR, false);

// Place the character to be sent in the data register

// 发送子地址

I2CMasterDataPut(I2C1_MASTER_BASE, addr);

// Initiate send of character from Master to Slave

// 设置主机状态

I2CMasterControl(I2C1_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START);

// Delay until transmission completes

while(I2CMasterBusy(I2C1_MASTER_BASE));

// Place the character to be sent in the data register

I2CMasterDataPut(I2C1_MASTER_BASE, data);

// Initiate send of character from Master to Slave

// 发送数据命令

I2CMasterControl(I2C1_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);

// Delay until transmission completes

while(I2CMasterBusy(I2C1_MASTER_BASE));

//  发送结束命令

I2CMasterControl(I2C1_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH);

//  等待命令发送结束

while(I2CMasterBusy(I2C1_MASTER_BASE));
}

unsigned long PCF8563Read(unsigned char address)
{

unsigned long data;

// Specify slave address  指定从机地址

I2CMasterSlaveAddrSet(I2C1_MASTER_BASE, PCF8563ADDR, false);

// Place the character to be sent in the data register

I2CMasterDataPut(I2C1_MASTER_BASE,address);

// Initiate send of character from Master to Slave

I2CMasterControl(I2C1_MASTER_BASE,  I2C_MASTER_CMD_BURST_SEND_START);

// Delay until transmission completes

while(I2CMasterBusy(I2C1_MASTER_BASE));

//指定从机地址

I2CMasterSlaveAddrSet(I2C1_MASTER_BASE, PCF8563ADDR, true);

//Initiate send character from Slave to Master

// 读取数据命令

I2CMasterControl(I2C1_MASTER_BASE,  I2C_MASTER_CMD_SINGLE_RECEIVE);

// Delay until transmission completes

while(I2CMasterBusy(I2C1_MASTER_BASE));

//get the data

data=I2CMasterDataGet(I2C1_MASTER_BASE);

//发送一个停止位

//I2CMasterControl(I2C1_MASTER_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);

//while(I2CMasterBusBusy(I2C1_MASTER_BASE));

//UARTprintf("read value: %d\n", data);

return data;
}

void BSP_RTCInit(void)
{

unsigned long ulVal;

// Enable the peripherals used by this example.

SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C1);//开启I2C1模块
   SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);//开启GPIOA模块(PA6+PA7)

// 管脚功能及参数配置

GPIOPinConfigure(GPIO_PA6_I2C1SCL);//配置PA6复选功能为I2C1SCL

GPIOPinConfigure(GPIO_PA7_I2C1SDA);//配置PA7复选功能为I2C1SDA

GPIOPinTypeI2C(GPIO_PORTA_BASE,

GPIO_PIN_6 | GPIO_PIN_7);//针对PA6、PA7配置管脚电气参数

// Initialize Master and Slave

ulVal = SysCtlClockGet();

I2CMasterInitExpClk(I2C1_MASTER_BASE, ulVal, false);

//I2CMasterEnable(I2C1_MASTER_BASE);
}

void BSP_GetTime(DT * time)
{

time->Second = PCF8563Read(PCF8563SECOND) & 0x7F;

time->Minute = PCF8563Read(PCF8563MINUTE) & 0x7F;

time->Hour = PCF8563Read(PCF8563HOUR) & 0x3F;

time->Day = PCF8563Read(PCF8563DAY) & 0x3F;

time->Week = PCF8563Read(PCF8563WEEK) & 0x07;

time->Month = PCF8563Read(PCF8563MONTH) & 0x1F;

time->Year = PCF8563Read(PCF8563YEAR);
}

void BSP_InitTime(void)
{

PCF8563Write(PCF8563MINUTE, 0x18);

PCF8563Write(PCF8563HOUR, 0x08);

PCF8563Write(PCF8563DAY, 0x05);

PCF8563Write(PCF8563WEEK, 0x06);

PCF8563Write(PCF8563MONTH, 0x11);

PCF8563Write(PCF8563YEAR, 0x11);
}