LPC1114 I2C 的问题？

lanyu345

LPC1114 I2C 的问题？ [复制链接]

不知大家有没有弄过I2C的 原来没有弄过， 想弄下， 前几天看啦1114的例程大概了解，这几天 寻思再研究下， 不知有没有弄过的 ， 分享下，

    单片机的I2C 倒是弄啦下， 就是AT24C02 的EEPROM ， 但是弄到1114上， 应该是有点不得要领吧， 哈哈 ， 最近时间少啦点， 没有一直在弄这个， 今天发个贴， 有机会多多学习！！！

[ 本帖最后由 lanyu345 于 2010-5-27 09:09 编辑 ]

合成设计

也是没时间，想试，一直没试上呢。板子已经做上了。

lanyu345

呵呵 ， 连上啦 做啦一点调试， 存在问题，

zhaojun_xf

好像IIC存在一定的问题：

LPC1114的I2C有个bug，在操作前需要释放I2C复位，在程序前面添加下面代码释放I2C复位，然后再试下。

LPC_SYSCON->;PRESETCTRL &= 1<<1;  

LPC_SYSCON->;PRESETCTRL |= 1<<1;  

 

如果还有问题，上传下代码，一起研究下 ：）

另外：

CoBuilder下有LPC1114的I2C的例子，可以参考下。

lanyu345

  /* In order to start the I2CEngine, the all the parameters
  must be set in advance, including I2CWriteLength, I2CReadLength,
  I2CCmd, and the I2cMasterBuffer which contains the stream
  command/data to the I2c slave device.
  (1) If it's a I2C write only, the number of bytes to be written is
  I2CWriteLength, I2CReadLength is zero, the content will be filled
  in the I2CMasterBuffer.
  (2) If it's a I2C read only, the number of bytes to be read is
  I2CReadLength, I2CWriteLength is 0, the read value will be filled
  in the I2CMasterBuffer.
  (3) If it's a I2C Write/Read with repeated start, specify the
  I2CWriteLength, fill the content of bytes to be written in
  I2CMasterBuffer, specify the I2CReadLength, after the repeated
  start and the device address with RD bit set, the content of the
  reading will be filled in I2CMasterBuffer index at
  I2CMasterBuffer[I2CWriteLength+2].
 
  e.g. Start, DevAddr(W), WRByte1...WRByteN, Repeated-Start, DevAddr(R),

  RDByte1...RDByteN Stop. The content of the reading will be filled
  after (I2CWriteLength + two devaddr) bytes. */

 

lanyu345

  /* It seems to be bit0 is for I2C, different from
  UM. To be retested along with SSP reset. SSP and I2C  

  reset are overlapped, a known bug, for now, both SSP 

  and I2C use bit 0 for reset enable. Once the problem
  is fixed, change to "#if 1". */

小周迅粉丝

可以参考一下下面的资料：

【TinyM0配套教程】功能部件（I2C）

LPC1100用户手册(第十章)I2C接口 

lanyu345

 好的， 谢谢！！！