【创龙TMS320C6748开发板试用】+ I2C接口配置

最近一段时间忙着考试，没留意试用报告分享时间是到20号~先说声抱歉了
先把程序放上来供大家参考，等考完试我再把相关寄存器配置说明补上~~~再说声抱歉

这部分介绍I2C接口配置，这个接口是串行接口，数据率不高，但就是简单，相比同样串行的总线SPI来说，它总共两根线，一根时钟线，一根数据线，而SPI有三根线，输入输出是分开的，我们有用到这个接口用于读取CODEC芯片中的寄存器。
一、I2C接口简介
（稍后再补）

二、I2C接口寄存器介绍
（稍后再补）

三、基于CSLr的I2C数据收发例程
1、I2C初始化函数
extern void setup_I2C(void)
{
CSL_FINST(i2cRegs->ICMDR,I2C_ICMDR_IRS,DISABLE);//I2C复位状态
i2cRegs->ICMDR=(
(CSL_I2C_ICMDR_FREE_TRUE< |(CSL_I2C_ICMDR_MST_MASTER_MODE< |(CSL_I2C_ICMDR_TRX_TX_MODE< |(CSL_I2C_ICMDR_XA_7BIT< |(CSL_I2C_ICMDR_RM_ENABLE< |(CSL_I2C_ICMDR_DLB_ENABLE< |(CSL_I2C_ICMDR_FDF_DISABLE< |(CSL_I2C_ICMDR_BC_8BIT< );
i2cRegs->ICOAR=(0x00< //i2cRegs->ICSAR=(0x01< i2cRegs->ICPSC=(1< //I2C总线时钟为12MHz/((6+ICCH)+(6+ICCL))=1MHz
i2cRegs->ICCLKH=(10< i2cRegs->ICCLKL=(10< i2cRegs->ICSTR=(
(CSL_I2C_ICSTR_SDIR_CLEAR< |(CSL_I2C_ICSTR_NACKSNT_CLEAR< |(CSL_I2C_ICSTR_BB_CLEAR< |(CSL_I2C_ICSTR_SCD_CLEAR< |(CSL_I2C_ICSTR_ICXRDY_CLEAR< |(CSL_I2C_ICSTR_ICRRDY_CLEAR< |(CSL_I2C_ICSTR_ARDY_CLEAR< |(CSL_I2C_ICSTR_NACK_CLEAR< |(CSL_I2C_ICSTR_AL_CLEAR< );
while(CSL_FEXT(i2cRegs->ICIVR,I2C_ICIVR_INTCODE));//等待中断清除
CSL_FINST(i2cRegs->ICMDR,I2C_ICMDR_IRS,ENABLE);//I2C使能
}
2、I2C发送数据函数
extern void i2c_Transfer(int *i2c_src,int i2c_src_length)
{
int jj;
while(CSL_FEXT(i2cRegs->ICSTR,I2C_ICSTR_BB));//等待总线释放
CSL_FINST(i2cRegs->ICMDR,I2C_ICMDR_STT,SET);//开始位
for(jj=0;jj {
  while(CSL_FEXT(i2cRegs->ICSTR,I2C_ICSTR_ICXRDY)==0);
  CSL_FINS(i2cRegs->ICDXR,I2C_ICDXR_D,*i2c_src++);
}
CSL_FINST(i2cRegs->ICMDR,I2C_ICMDR_STP,SET);//停止位
}
3、I2C接收函数函数
extern void i2c_Reciver(int *i2c_dst,int i2c_dst_length)
{
int jj;
for(jj=0;jj {
  while(CSL_FEXT(i2cRegs->ICSTR,I2C_ICSTR_ICRRDY)==0);
  (*i2c_dst++)=CSL_FEXT(i2cRegs->ICDRR,I2C_ICDRR_D);
}
CSL_FINST(i2cRegs->ICMDR,I2C_ICMDR_STP,SET);//停止位
}
4、I2C回环模式，相当于自检
extern void i2c_Lookback(char *i2c_src,char *i2c_dst,int i2c_length)
{
int jj;
while(CSL_FEXT(i2cRegs->ICSTR,I2C_ICSTR_BB));//等待总线释放
CSL_FINST(i2cRegs->ICMDR,I2C_ICMDR_STT,SET);//开始位
for(jj=0;jj {
  while(CSL_FEXT(i2cRegs->ICSTR,I2C_ICSTR_ICXRDY)==0);
  CSL_FINS(i2cRegs->ICDXR,I2C_ICDXR_D,*i2c_src++);
  while(CSL_FEXT(i2cRegs->ICSTR,I2C_ICSTR_ICRRDY)==0);
  (*i2c_dst++)=CSL_FEXT(i2cRegs->ICDRR,I2C_ICDRR_D);
}
CSL_FINST(i2cRegs->ICMDR,I2C_ICMDR_STP,SET);//停止位
}
5、主函数
char SRC_AA[32] = "abcdefghijklmnopqrstuvwxyz123456";
char DST_AA[32];
void main(void)
{
setup_I2C();
asm("nop");
i2c_Lookback(&SRC_AA[0],&DST_AA[0],32);
while(1);
}