void DAC_SetBufferReadPointer(DAC_Type *base, uint8_t index)
{
assert(index < DAC_DATL_COUNT);
uint8_t tmp8 = base->C2 & ~DAC_C2_DACBFRP_MASK;
tmp8 |= DAC_C2_DACBFRP(index);
base->C2 = tmp8;
}
/***********************************************************************************************
功能：DAC初始化
形参：DAC_InitStruct: DAC初始化结构
返回：0
详解：0
************************************************************************************************/
void DAC_Init(DAC_InitTypeDef* DAC_InitStruct)
{
//参数检查
assert_param(IS_DAC_TRIGGER_MODE(DAC_InitStruct->DAC_TrigerMode));
assert_param(IS_DAC_BUFFER_MODE(DAC_InitStruct->DAC_BufferMode));
assert_param(IS_DAC_WATERMARK_MODE(DAC_InitStruct->DAC_WaterMarkMode));
//开启DAC模块时钟
SIM->SCGC2|=SIM_SCGC2_DAC0_MASK;
//配置BUFFER模式
switch(DAC_InitStruct->DAC_BufferMode)
{
case DAC_TRIGER_MODE_NONE:
DAC0->C0 &= ~DAC_C0_DACTRGSEL_MASK;
DAC0->C0 |= DAC_C0_DACSWTRG_MASK;
break;
case DAC_TRIGER_MODE_SOFTWARE:
DAC0->C0 |= DAC_C0_DACTRGSEL_MASK;
DAC0->C0 |= DAC_C0_DACSWTRG_MASK;
break;
case DAC_TRIGER_MODE_HARDWARE:
DAC0->C0 &= ~DAC_C0_DACTRGSEL_MASK;
DAC0->C0 &= ~DAC_C0_DACSWTRG_MASK;
break;
default:break;
}
//选择参考源2
DAC0->C0 |= DAC_C0_DACRFS_MASK;
//开启DAC模块
DAC0->C0 |= DAC_C0_DACEN_MASK ;
//配置DAC_C1寄存器 配置BUFFER模式
switch(DAC_InitStruct->DAC_BufferMode)
{
case BUFFER_MODE_NORMAL:
DAC0->C1 |= DAC_C1_DACBFEN_MASK;
DAC0->C1 |= DAC_C1_DACBFMD(0);
break;
case BUFFER_MODE_SWING:
DAC0->C1 |= DAC_C1_DACBFEN_MASK;
DAC0->C1 |= DAC_C1_DACBFMD(1);
break;
case BUFFER_MODE_ONETIMESCAN:
DAC0->C1 |= DAC_C1_DACBFEN_MASK;
DAC0->C1 |= DAC_C1_DACBFMD(2);
break;
case BUFFER_MODE_DISABLE:
DAC0->C1 &= ~DAC_C1_DACBFEN_MASK;
break;
}
//设置水位
switch(DAC_InitStruct->DAC_WaterMarkMode)
{
case WATER_MODE_1WORD:
DAC0->C1 |= DAC_C1_DACBFWM(0);
break;
case WATER_MODE_2WORD:
DAC0->C1 |= DAC_C1_DACBFWM(1);
break;
case WATER_MODE_3WORD:
DAC0->C1 |= DAC_C1_DACBFWM(2);
break;
case WATER_MODE_4WORD:
DAC0->C1 |= DAC_C1_DACBFWM(3);
break;
default:break;
}
//配置C2寄存器 设置上限和下线
DAC0->C2 = DAC_C2_DACBFUP(DAC_InitStruct->DAC_BufferUpperLimit);
DAC0->C2 |= DAC_C2_DACBFRP(DAC_InitStruct->DAC_BufferStartPostion);
}
/**
* @brief 设置DAC模块buffer的指针
*
* @param instance :模块号
* @arg HW_DAC0 :芯片的DAC0 模块
* @arg HW_DAC1 :芯片的DAC1 模块
* @param value :指针位置 0-15
* @retval None
*/
void DAC_SetBufferReadPointer(uint32_t instance, uint32_t value)
{
DAC_InstanceTable[instance]->C2 &= ~DAC_C2_DACBFRP_MASK;
DAC_InstanceTable[instance]->C2 |= DAC_C2_DACBFRP(value);
}
