TI中文支持网配置了三种模式，为单次模式，连续模式和DMA传输
单次模式是调用一次采集函数，在指定的某一个AD端口采集，用到的时候在去采样
连续模式是连续转换多个通道，采用级联模式，采用16路AD通道的值
DMA传输时AD采样的值直接通过DMA传输到内存中，不需要要CPU干预，持续采样，放到内存，需要用到数据的时候去读取相应的存储区即可。
1、单次模式
//单次模式AD初始化
void Ad_Onechanneltime_Init(void)
{
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
InitAdc(); // For this example, init the ADC
// Specific ADC setup for this example:
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK; // Sequential mode: Sample rate = 1/[(2+ACQ_PS)*ADC //clock in ns]
// = 1/(3*40ns) =8.3MHz (for 150 MHz SYSCLKOUT)
// = 1/(3*80ns) =4.17MHz (for 100 MHz SYSCLKOUT)
// If Simultaneous mode enabled: Sample rate = 1/[(3+ACQ_PS)*ADC clock in ns]
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1; // 1 级联模式
AdcRegs.ADCTRL1.bit.CONT_RUN = 0; // 启动停止模式
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1; // Enable Sequencer override feature
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x0; // convert and store in 1 results registers
DELAY_US(100);
}
//单通道单次转换0~7对应A0~A7，8~15对应B0~B7
Uint16 Ad_Get(u8 n)
{
switch (n)
{
case 0: AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0;break;
case 1: AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1;break;
case 2: AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x2;break;
case 3: AdcRegs.ADCCHSELSEQ1.bit.CONV03 = 0x3;break;
case 4: AdcRegs.ADCCHSELSEQ2.bit.CONV04 = 0x4;break;
case 5: AdcRegs.ADCCHSELSEQ2.bit.CONV05 = 0x5;break;
case 6: AdcRegs.ADCCHSELSEQ2.bit.CONV06 = 0x6;break;
case 7: AdcRegs.ADCCHSELSEQ2.bit.CONV07 = 0x7;break;
case 8: AdcRegs.ADCCHSELSEQ3.bit.CONV08 = 0x8;break;
case 9: AdcRegs.ADCCHSELSEQ3.bit.CONV09 = 0x9;break;
case 10: AdcRegs.ADCCHSELSEQ3.bit.CONV10 = 0x0A;break;
case 11: AdcRegs.ADCCHSELSEQ3.bit.CONV11 = 0x0B;break;
case 12: AdcRegs.ADCCHSELSEQ4.bit.CONV12 = 0x0C;break;
case 13: AdcRegs.ADCCHSELSEQ4.bit.CONV13 = 0x0D;break;
case 14: AdcRegs.ADCCHSELSEQ4.bit.CONV14 = 0x0E;break;
case 15: AdcRegs.ADCCHSELSEQ4.bit.CONV15 = 0x0F;break;
default :break;
}
//Start SEQ1
AdcRegs.ADCTRL2.bit.SOC_SEQ1=1;
while(AdcRegs.ADCST.bit.INT_SEQ1 == 0);
AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;
switch (n)
{
case 0: return ( (AdcRegs.ADCRESULT0)>>4);break;
case 1: return ( (AdcRegs.ADCRESULT1)>>4);break;
case 2: return ( (AdcRegs.ADCRESULT2)>>4);break;
case 3: return ( (AdcRegs.ADCRESULT3)>>4);break;
case 4: return ( (AdcRegs.ADCRESULT4)>>4);break;
case 5: return ( (AdcRegs.ADCRESULT5)>>4);break;
case 6: return ( (AdcRegs.ADCRESULT6)>>4);break;
case 7: return ( (AdcRegs.ADCRESULT7)>>4);break;
case 8: return ( (AdcRegs.ADCRESULT8)>>4);break;
case 9: return ( (AdcRegs.ADCRESULT9)>>4);break;
case 10: return ( (AdcRegs.ADCRESULT10)>>4);break;
case 11: return ( (AdcRegs.ADCRESULT11)>>4);break;
case 12: return ( (AdcRegs.ADCRESULT12)>>4);break;
case 13: return ( (AdcRegs.ADCRESULT13)>>4);break;
case 14: return ( (AdcRegs.ADCRESULT14)>>4);break;
case 15: return ( (AdcRegs.ADCRESULT15)>>4);break;
default: break;
}
return 0;
}
2、级联顺序转换
//级联顺序转换
void Ad_Contrun_Init(void)
{
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
InitAdc(); // For this example, init the ADC
// Specific ADC setup for this example:
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK; // Sequential mode: Sample rate = 1/[(2+ACQ_PS)*ADC //clock in ns]
// If Simultaneous mode enabled: Sample rate = 1/[(3+ACQ_PS)*ADC //clock in ns]
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1; // 1 级联模式
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 0x1; //允许向CPU发出中断请求
AdcRegs.ADCTRL2.bit.RST_SEQ1 = 0x1;
AdcRegs.ADCTRL1.bit.CONT_RUN = 1; // 连续模式
AdcRegs.ADCTRL3.bit.SMODE_SEL= 0; // 顺序采样
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1; // Enable Sequencer override feature
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0xF; // 要转换的通道数
AdcRegs.ADCCHSELSEQ1.all = 0x3210; // Initialize all ADC channel
AdcRegs.ADCCHSELSEQ2.all = 0x7654; //每个通道对应相应的结果寄存器
AdcRegs.ADCCHSELSEQ3.all = 0xBA98;
AdcRegs.ADCCHSELSEQ4.all = 0xFEDC;
AdcRegs.ADCTRL2.bit.SOC_SEQ1=1;
DELAY_US(100);
}
//级联顺序转换，根据初始化的通道数可以改变相应要获取的结果寄存器
void Ad_Contrun_Get(Uint16 *value)
{
value[0] = ( (AdcRegs.ADCRESULT0)>>4);
value[1] = ( (AdcRegs.ADCRESULT1)>>4);
value[2] = ( (AdcRegs.ADCRESULT2)>>4);
value[3] = ( (AdcRegs.ADCRESULT3)>>4);
value[4] = ( (AdcRegs.ADCRESULT4)>>4);
value[5] = ( (AdcRegs.ADCRESULT5)>>4);
value[6] = ( (AdcRegs.ADCRESULT6)>>4);
value[7] = ( (AdcRegs.ADCRESULT7)>>4);
value[8] = ( (AdcRegs.ADCRESULT8)>>4);
value[9] = ( (AdcRegs.ADCRESULT9)>>4);
value[10] = ( (AdcRegs.ADCRESULT10)>>4);
value[11] = ( (AdcRegs.ADCRESULT11)>>4);
value[12] = ( (AdcRegs.ADCRESULT12)>>4);
value[13] = ( (AdcRegs.ADCRESULT13)>>4);
value[14] = ( (AdcRegs.ADCRESULT14)>>4);
value[15] = ( (AdcRegs.ADCRESULT15)>>4);
}
main函数中调用
Uint16 ad[16]={0};
…
…
Ad_Contrun_Init(); //AD连续顺序转换
while(1)
{
….
Ad_Contrun_Get(ad); // 读取AD值
….
…..
..
}
3、DMA传输(函数基本都是TI的库文件中的，配置参数即可)
volatile Uint16 DMABuf1[16];
volatile Uint16 *DMADest;
volatile Uint16 *DMASource;
main函数中要设置的东西
DMAInitialize();
for (i=0; i<DMA_BUF_SIZE; i++) // Clear Table
{
DMABuf1[i] = 0;
}
DMADest = &DMABuf1[0]; //指定目标buf数组首地址
DMASource = &AdcMirror.ADCRESULT0; //指定
DMACH1AddrConfig(DMADest,DMASource);
DMACH1BurstConfig(1,1,1);
DMACH1TransferConfig(7,1,1);
DMACH1WrapConfig(0xffff,0,0xffff,0);
DMACH1ModeConfig(DMA_SEQ1INT,PERINT_ENABLE,ONESHOT_DISABLE,CONT_ENABLE,SYNC_DISABLE, SYNC_SRC,OVRFLOW_DISABLE,SIXTEEN_BIT,CHINT_END,CHINT_ENABLE);
StartDMACH1();
当然首先AD要配置为连续采样模式，然后就可以直接去读DMABuf1数组的值了
Eric Ma：
多谢分享。
ERIC
user4671742：
多谢分享，刚好有用，还是有大用，多谢楼主
user3838050：
没看懂单次采样的程序，如果n=7，执行了case 7:AdcRegs.ADCCHSELSEQ2.bit.CONV07 = 0x7;break; 但是当SOC_SEQ1=1时，不是只是从CONV00开始执行的吗，且MAX_CONV1 = 0x0，那么是如何实现n=7是采样到端口7的呢？没看明白
