TI中文支持网使用ePWM事件触发方式启动AD转换，转换频率为6M，请问该怎么设置啊，自己按照官网的例程修改的程序EPwm1Regs.CMPA.half.CMPA = 6;
EPwm1Regs.TBPRD = 12，用示波器量出来只有212KHz，请问是什么原因，初始化程序如下：
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
//— Peripheral Initialization
InitAdc();// Initialize the ADC (FILE: Adc.c)
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT = &adc_isr;
EDIS;// This is needed to disable write to EALLOW protected registers
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;
AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;
AdcRegs.ADCTRL1.bit.CONT_RUN = 0;
// Enable Sequencer override feature
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;
// Initialize all ADC channel selects to A0
AdcRegs.ADCCHSELSEQ1.all = 0x0;
AdcRegs.ADCCHSELSEQ2.all = 0x0;
AdcRegs.ADCCHSELSEQ3.all = 0x0;
AdcRegs.ADCCHSELSEQ4.all = 0x0;
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0;
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
EPwm1Regs.CMPA.half.CMPA = 6; // Set compare A value
EPwm1Regs.TBPRD = 12; // Set period for ePWM1
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
// Enable ADCINT in PIE
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
10#：
Feng Youkui Feng Youkui
EPwm1Regs.CMPA.half.CMPA = 6; EPwm1Regs.TBPRD = 12，用示波器量出来只有212KHz，请问是什么原因，初始化程序如下：
212kHz具体测量的是什么信号的频率？下面的其它配置里修改部分参数会怎样？
Feng Youkui Feng Youkui
EALLOW; SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK EDIS;
//— Peripheral Initialization InitAdc();// Initialize the ADC (FILE: Adc.c)
// Interrupts that are used in this example are re-mapped to // ISR functions found within this file. EALLOW; // This is needed to write to EALLOW protected register PieVectTable.ADCINT = &adc_isr; EDIS;// This is needed to disable write to EALLOW protected registers
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK; AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
这里的ADC_MODCLK，ADC_SHCLK，ADC_CKPS宏定义的值具体是多少？
如果
EPwm1Regs.ETSEL.bit.SOCAEN = 1;
改成
EPwm1Regs.ETSEL.bit.SOCAEN = 0;
会怎样？
使用ePWM事件触发方式启动AD转换，转换频率为6M，请问该怎么设置啊，自己按照官网的例程修改的程序EPwm1Regs.CMPA.half.CMPA = 6;
EPwm1Regs.TBPRD = 12，用示波器量出来只有212KHz，请问是什么原因，初始化程序如下：
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
//— Peripheral Initialization
InitAdc();// Initialize the ADC (FILE: Adc.c)
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT = &adc_isr;
EDIS;// This is needed to disable write to EALLOW protected registers
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;
AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;
AdcRegs.ADCTRL1.bit.CONT_RUN = 0;
// Enable Sequencer override feature
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;
// Initialize all ADC channel selects to A0
AdcRegs.ADCCHSELSEQ1.all = 0x0;
AdcRegs.ADCCHSELSEQ2.all = 0x0;
AdcRegs.ADCCHSELSEQ3.all = 0x0;
AdcRegs.ADCCHSELSEQ4.all = 0x0;
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0;
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
EPwm1Regs.CMPA.half.CMPA = 6; // Set compare A value
EPwm1Regs.TBPRD = 12; // Set period for ePWM1
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
// Enable ADCINT in PIE
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
Feng Youkui Feng Youkui：
回复 10#:
212kHz具体测量的是进入中断后在中断函数里翻转GPIO口 用示波器测量得到的 2*106KHz
#if (CPU_FRQ_150MHZ) // Default – 150 MHz SYSCLKOUT #define ADC_MODCLK 0x3 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz#endif
#define ADC_CKPS 0x0 // ADC module clock = HSPCLK/1 = 25.5MHz/(1) = 25.0 MHz#define ADC_SHCLK 0x1 // S/H width in ADC module periods
EPwm1Regs.ETSEL.bit.SOCAEN = 1;
改成
EPwm1Regs.ETSEL.bit.SOCAEN = 0;后不能正常进入adc_isr中断函数
使用ePWM事件触发方式启动AD转换，转换频率为6M，请问该怎么设置啊，自己按照官网的例程修改的程序EPwm1Regs.CMPA.half.CMPA = 6;
EPwm1Regs.TBPRD = 12，用示波器量出来只有212KHz，请问是什么原因，初始化程序如下：
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
//— Peripheral Initialization
InitAdc();// Initialize the ADC (FILE: Adc.c)
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT = &adc_isr;
EDIS;// This is needed to disable write to EALLOW protected registers
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;
AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;
AdcRegs.ADCTRL1.bit.CONT_RUN = 0;
// Enable Sequencer override feature
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;
// Initialize all ADC channel selects to A0
AdcRegs.ADCCHSELSEQ1.all = 0x0;
AdcRegs.ADCCHSELSEQ2.all = 0x0;
AdcRegs.ADCCHSELSEQ3.all = 0x0;
AdcRegs.ADCCHSELSEQ4.all = 0x0;
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0;
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
EPwm1Regs.CMPA.half.CMPA = 6; // Set compare A value
EPwm1Regs.TBPRD = 12; // Set period for ePWM1
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
// Enable ADCINT in PIE
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
10#：
回复 Feng Youkui Feng Youkui:
所以你是在每次ADC转换后进入ADC中断？这样看，你的程序设计可能存在问题，因为你的采样时间设置的太短(ADCCLK=25MHz, ACQ_PS=1)，也就是每个信号仅用时2个时钟，即80ns，达到最高的12.5MHz的采样速度，这个本身是没有问题的，因为F28335的ADC模块支持这么高的转换速度，但是，你每次只采样一个信号(MAX_CONV1 = 0)，然后每次都进入中断(INT_ENA_SEQ1 = 1)，这个是CPU处理不过来的：80ns/6.67ns=12，也就是要求中断必须在12个指令周期内完成 — 这显然是不可能的：参考下面内容，进入中断进行现场保护就至少需要16个时钟，更何况你还需要处理数据，清除标志位等等。
http://processors.wiki.ti.com/index.php/Interrupt_FAQ_for_C2000#ISR_Latency
建议你可以调整方式测试一下，比如多采样几个通道，或者增大采样窗口，或者稍微调低转换速度，或者每两次转换进一次中断等等(根据上方括号里引用的配置简单修改即可)，而在实际应用场景里，通常都是采样多个信号后产生一次中断，进行数据读取，因此既可以达到12.5MH在的采样速度，也不会影响数据的处理。
最后，既然你也配置了级联模式(SEQ_CASC = 1)，为什么不多采样几个信号呢？
使用ePWM事件触发方式启动AD转换，转换频率为6M，请问该怎么设置啊，自己按照官网的例程修改的程序EPwm1Regs.CMPA.half.CMPA = 6;
EPwm1Regs.TBPRD = 12，用示波器量出来只有212KHz，请问是什么原因，初始化程序如下：
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
//— Peripheral Initialization
InitAdc();// Initialize the ADC (FILE: Adc.c)
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT = &adc_isr;
EDIS;// This is needed to disable write to EALLOW protected registers
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;
AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;
AdcRegs.ADCTRL1.bit.CONT_RUN = 0;
// Enable Sequencer override feature
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;
// Initialize all ADC channel selects to A0
AdcRegs.ADCCHSELSEQ1.all = 0x0;
AdcRegs.ADCCHSELSEQ2.all = 0x0;
AdcRegs.ADCCHSELSEQ3.all = 0x0;
AdcRegs.ADCCHSELSEQ4.all = 0x0;
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0;
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
EPwm1Regs.CMPA.half.CMPA = 6; // Set compare A value
EPwm1Regs.TBPRD = 12; // Set period for ePWM1
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
// Enable ADCINT in PIE
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
Feng Youkui Feng Youkui：
回复 10#:
请问AN0引脚采样2M的输入信号 程序该如何编写?根据采样定理需要大于2倍的采样速率才可以 也就是说AD采样要达到4M，这要怎么设置呢？
使用ePWM事件触发方式启动AD转换，转换频率为6M，请问该怎么设置啊，自己按照官网的例程修改的程序EPwm1Regs.CMPA.half.CMPA = 6;
EPwm1Regs.TBPRD = 12，用示波器量出来只有212KHz，请问是什么原因，初始化程序如下：
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
//— Peripheral Initialization
InitAdc();// Initialize the ADC (FILE: Adc.c)
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT = &adc_isr;
EDIS;// This is needed to disable write to EALLOW protected registers
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;
AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;
AdcRegs.ADCTRL1.bit.CONT_RUN = 0;
// Enable Sequencer override feature
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;
// Initialize all ADC channel selects to A0
AdcRegs.ADCCHSELSEQ1.all = 0x0;
AdcRegs.ADCCHSELSEQ2.all = 0x0;
AdcRegs.ADCCHSELSEQ3.all = 0x0;
AdcRegs.ADCCHSELSEQ4.all = 0x0;
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0;
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
EPwm1Regs.CMPA.half.CMPA = 6; // Set compare A value
EPwm1Regs.TBPRD = 12; // Set period for ePWM1
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
// Enable ADCINT in PIE
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
10#：
回复 Feng Youkui Feng Youkui:
上面提到，采样速度达到12.5MHz都没有问题呀，关键是你不能每次都进中断，因为CPU响应不过来。
请仔细阅读并理解我上面的分析，将ADC采样转换和CPU执行中断代码这两件事情分开，你就不会困惑了。
使用ePWM事件触发方式启动AD转换，转换频率为6M，请问该怎么设置啊，自己按照官网的例程修改的程序EPwm1Regs.CMPA.half.CMPA = 6;
EPwm1Regs.TBPRD = 12，用示波器量出来只有212KHz，请问是什么原因，初始化程序如下：
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
//— Peripheral Initialization
InitAdc();// Initialize the ADC (FILE: Adc.c)
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT = &adc_isr;
EDIS;// This is needed to disable write to EALLOW protected registers
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;
AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;
AdcRegs.ADCTRL1.bit.CONT_RUN = 0;
// Enable Sequencer override feature
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;
// Initialize all ADC channel selects to A0
AdcRegs.ADCCHSELSEQ1.all = 0x0;
AdcRegs.ADCCHSELSEQ2.all = 0x0;
AdcRegs.ADCCHSELSEQ3.all = 0x0;
AdcRegs.ADCCHSELSEQ4.all = 0x0;
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0;
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
EPwm1Regs.CMPA.half.CMPA = 6; // Set compare A value
EPwm1Regs.TBPRD = 12; // Set period for ePWM1
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
// Enable ADCINT in PIE
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
Feng Youkui Feng Youkui：
回复 10#:
如果用查询方式 如何确定采样频率？如下面的程序如何确定采样频率是多少？？？
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
// Determine when the shift to right justify the data takes place// Only one of these should be defined as 1.// The other two should be defined as 0.#define POST_SHIFT 0 // Shift results after the entire sample table is full#define INLINE_SHIFT 1 // Shift results as the data is taken from the results regsiter#define NO_SHIFT 0 // Do not shift the results
// ADC start parameters#if (CPU_FRQ_150MHZ) // Default – 150 MHz SYSCLKOUT #define ADC_MODCLK 0x3 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz#endif#if (CPU_FRQ_100MHZ) #define ADC_MODCLK 0x2 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 100/(2*2) = 25.0 MHz#endif#define ADC_CKPS 0x0 // ADC module clock = HSPCLK/1 = 25.5MHz/(1) = 25.0 MHz#define ADC_SHCLK 16 // S/H width in ADC module periods = 2 ADC cycle#define AVG 1000 // Average sample limit#define ZOFFSET 0x00 // Average Zero offset#define BUF_SIZE 1024 // Sample buffer size
// Global variable for this exampleUint16 SampleTable[BUF_SIZE];
main(){ Uint16 i; Uint16 array_index;
// Step 1. Initialize System Control:// PLL, WatchDog, enable Peripheral Clocks// This example function is found in the DSP2833x_SysCtrl.c file. InitSysCtrl();
// Specific clock setting for this example: EALLOW; SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK EDIS;
// Step 2. Initialize GPIO:// This example function is found in the DSP2833x_Gpio.c file and// illustrates how to set the GPIO to it's default state.// InitGpio(); // Skipped for this example// Enable the pin GPIO34 as output EALLOW; GpioCtrlRegs.GPBMUX1.bit.GPIO34 = 0; // GPIO pin GpioCtrlRegs.GPBDIR.bit.GPIO34 = 1; // Output pin EDIS;
// Step 3. Clear all interrupts and initialize PIE vector table:// Disable CPU interrupts DINT;
// Initialize the PIE control registers to their default state.// The default state is all PIE interrupts disabled and flags// are cleared.// This function is found in the DSP2833x_PieCtrl.c file. InitPieCtrl();
// Disable CPU interrupts and clear all CPU interrupt flags: IER = 0x0000; IFR = 0x0000;
// Initialize the PIE vector table with pointers to the shell Interrupt// Service Routines (ISR).// This will populate the entire table, even if the interrupt// is not used in this example. This is useful for debug purposes.// The shell ISR routines are found in DSP2833x_DefaultIsr.c.// This function is found in DSP2833x_PieVect.c. InitPieVectTable();
// Step 4. Initialize all the Device Peripherals:// This function is found in DSP2833x_InitPeripherals.c// InitPeripherals(); // Not required for this example 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 Cascaded mode AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; AdcRegs.ADCTRL1.bit.CONT_RUN = 1; // Setup continuous run
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1; // Enable Sequencer override feature AdcRegs.ADCCHSELSEQ1.all = 0x0; // Initialize all ADC channel selects to A0 AdcRegs.ADCCHSELSEQ2.all = 0x0; AdcRegs.ADCCHSELSEQ3.all = 0x0; AdcRegs.ADCCHSELSEQ4.all = 0x0; AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x7; // convert and store in 8 results registers
// Step 5. User specific code, enable interrupts:
// Clear SampleTable for (i=0; i<BUF_SIZE; i++) { SampleTable[i] = 0; }
// Start SEQ1 AdcRegs.ADCTRL2.all = 0x2000;
for(;;) { // Take ADC data and log them in SampleTable array
// Initialize the array index. This points to the current // location within the SampleTable array_index = 0;
for (i=0; i<(BUF_SIZE/16); i++) { // Wait for int1 while (AdcRegs.ADCST.bit.INT_SEQ1== 0){} GpioDataRegs.GPBSET.bit.GPIO34 = 1; // Set GPIO34 for monitoring -optional
AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;
#if INLINE_SHIFT SampleTable[array_index++]= ( (AdcRegs.ADCRESULT0)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT1)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT2)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT3)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT4)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT5)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT6)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT7)>>4);
#endif //– INLINE_SHIFT
#if NO_SHIFT || POST_SHIFT
SampleTable[array_index++]= ( (AdcRegs.ADCRESULT0)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT1)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT2)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT3)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT4)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT5)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT6)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT7));
#endif //– NO_SHIFT || POST_SHIFT
while (AdcRegs.ADCST.bit.INT_SEQ1== 0){} GpioDataRegs.GPBCLEAR.bit.GPIO34 = 1; // Clear GPIO34 for monitoring -optional AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;
#if INLINE_SHIFT
SampleTable[array_index++]= ( (AdcRegs.ADCRESULT8)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT9)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT10)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT11)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT12)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT13)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT14)>>4); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT15)>>4);
#endif //– INLINE_SHIFT
#if NO_SHIFT || POST_SHIFT
SampleTable[array_index++]= ( (AdcRegs.ADCRESULT8)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT9)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT10)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT11)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT12)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT13)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT14)); SampleTable[array_index++]= ( (AdcRegs.ADCRESULT15));#endif // — NO_SHIFT || POST_SHIFT
}
#if POST_SHIFT // For post shifting, shift the ADC results // in the SampleTable buffer after the buffer is full. for (i=0; i<BUF_SIZE; i++) { SampleTable[i] = ((SampleTable[i]) >>4); }#endif // — POST_SHIFT
GpioDataRegs.GPBCLEAR.bit.GPIO34 = 1; // Clear GPIO34 for monitoring -optional }}
使用ePWM事件触发方式启动AD转换，转换频率为6M，请问该怎么设置啊，自己按照官网的例程修改的程序EPwm1Regs.CMPA.half.CMPA = 6;
EPwm1Regs.TBPRD = 12，用示波器量出来只有212KHz，请问是什么原因，初始化程序如下：
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
//— Peripheral Initialization
InitAdc();// Initialize the ADC (FILE: Adc.c)
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT = &adc_isr;
EDIS;// This is needed to disable write to EALLOW protected registers
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;
AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;
AdcRegs.ADCTRL1.bit.CONT_RUN = 0;
// Enable Sequencer override feature
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;
// Initialize all ADC channel selects to A0
AdcRegs.ADCCHSELSEQ1.all = 0x0;
AdcRegs.ADCCHSELSEQ2.all = 0x0;
AdcRegs.ADCCHSELSEQ3.all = 0x0;
AdcRegs.ADCCHSELSEQ4.all = 0x0;
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0;
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
EPwm1Regs.CMPA.half.CMPA = 6; // Set compare A value
EPwm1Regs.TBPRD = 12; // Set period for ePWM1
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
// Enable ADCINT in PIE
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
10#：
回复 Feng Youkui Feng Youkui:
采样或转换频率与是否使用查询或中断方式无关。
采样频率是你设定用于触发SEQ的频率，也就是EPWM的SOCA产生的频率，即每隔多长时间让ADC进行一次采样和转换。
转换速度通常说的是每次采样和转换所需要的时间，这个跟ADCCLK有关，跟采样窗口大小有关。如我之前回复的，ADCCLK=25MHz，ACQ_PS=1时，这个时间是80ns ((1+1)/25MHz).
可以参考早些时候的相关讨论。
http://www.deyisupport.com/question_answer/microcontrollers/c2000/f/56/p/25637/86547.aspx#86547
使用ePWM事件触发方式启动AD转换，转换频率为6M，请问该怎么设置啊，自己按照官网的例程修改的程序EPwm1Regs.CMPA.half.CMPA = 6;
EPwm1Regs.TBPRD = 12，用示波器量出来只有212KHz，请问是什么原因，初始化程序如下：
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
//— Peripheral Initialization
InitAdc();// Initialize the ADC (FILE: Adc.c)
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT = &adc_isr;
EDIS;// This is needed to disable write to EALLOW protected registers
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;
AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;
AdcRegs.ADCTRL1.bit.CONT_RUN = 0;
// Enable Sequencer override feature
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;
// Initialize all ADC channel selects to A0
AdcRegs.ADCCHSELSEQ1.all = 0x0;
AdcRegs.ADCCHSELSEQ2.all = 0x0;
AdcRegs.ADCCHSELSEQ3.all = 0x0;
AdcRegs.ADCCHSELSEQ4.all = 0x0;
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0;
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
EPwm1Regs.CMPA.half.CMPA = 6; // Set compare A value
EPwm1Regs.TBPRD = 12; // Set period for ePWM1
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
// Enable ADCINT in PIE
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
Feng Youkui Feng Youkui：
回复 10#:
如果使用连续转换 是不是采样速率等于转换频率？
如果
HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz
AdcRegs.ADCTRL1.bit.ACQ_PS = 15;
AdcRegs.ADCTRL1.bit.CPS = 0;
AdcRegs.ADCTRL3.bit.ADCCLKPS =15;
那么转换时间是(15+1)/(25MHz/(30+1))=19.84us 频率就是1/19.84us=50.40KHz
采样的频率也是50.40KHz 这样理解对吗？
使用ePWM事件触发方式启动AD转换，转换频率为6M，请问该怎么设置啊，自己按照官网的例程修改的程序EPwm1Regs.CMPA.half.CMPA = 6;
EPwm1Regs.TBPRD = 12，用示波器量出来只有212KHz，请问是什么原因，初始化程序如下：
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
//— Peripheral Initialization
InitAdc();// Initialize the ADC (FILE: Adc.c)
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT = &adc_isr;
EDIS;// This is needed to disable write to EALLOW protected registers
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;
AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;
AdcRegs.ADCTRL1.bit.CONT_RUN = 0;
// Enable Sequencer override feature
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;
// Initialize all ADC channel selects to A0
AdcRegs.ADCCHSELSEQ1.all = 0x0;
AdcRegs.ADCCHSELSEQ2.all = 0x0;
AdcRegs.ADCCHSELSEQ3.all = 0x0;
AdcRegs.ADCCHSELSEQ4.all = 0x0;
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0;
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
EPwm1Regs.CMPA.half.CMPA = 6; // Set compare A value
EPwm1Regs.TBPRD = 12; // Set period for ePWM1
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
// Enable ADCINT in PIE
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
10#：
回复 Feng Youkui Feng Youkui:
Feng Youkui Feng Youkui
如果使用连续转换 是不是采样速率等于转换频率？
对。连续采样建议使用软件和硬件触发第一次采样，然后第一次采样的EOC产生中断，由中断触发后面的SEQ.
Feng Youkui Feng Youkui
如果
HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz
AdcRegs.ADCTRL1.bit.ACQ_PS = 15;
AdcRegs.ADCTRL1.bit.CPS = 0;
AdcRegs.ADCTRL3.bit.ADCCLKPS =15;
那么转换时间是(15+1)/(25MHz/(30+1))=19.84us 频率就是1/19.84us=50.40KHz
采样的频率也是50.40KHz 这样理解对吗？
有点小错误，请参考ADC用户手册的1.4.1 ADC-module Clock and Sample Rate章节进行计算。
(15+1)/(25MHz/(30*(0+1)))=18us，也就是55.5kHz.
使用ePWM事件触发方式启动AD转换，转换频率为6M，请问该怎么设置啊，自己按照官网的例程修改的程序EPwm1Regs.CMPA.half.CMPA = 6;
EPwm1Regs.TBPRD = 12，用示波器量出来只有212KHz，请问是什么原因，初始化程序如下：
EALLOW;
SysCtrlRegs.HISPCP.all = ADC_MODCLK; // HSPCLK = SYSCLKOUT/ADC_MODCLK
EDIS;
//— Peripheral Initialization
InitAdc();// Initialize the ADC (FILE: Adc.c)
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected register
PieVectTable.ADCINT = &adc_isr;
EDIS;// This is needed to disable write to EALLOW protected registers
AdcRegs.ADCTRL1.bit.ACQ_PS = ADC_SHCLK;
AdcRegs.ADCTRL3.bit.ADCCLKPS = ADC_CKPS;
AdcRegs.ADCTRL1.bit.SEQ_CASC = 1;
AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;
AdcRegs.ADCTRL1.bit.CONT_RUN = 0;
// Enable Sequencer override feature
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 1;
// Initialize all ADC channel selects to A0
AdcRegs.ADCCHSELSEQ1.all = 0x0;
AdcRegs.ADCCHSELSEQ2.all = 0x0;
AdcRegs.ADCCHSELSEQ3.all = 0x0;
AdcRegs.ADCCHSELSEQ4.all = 0x0;
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;
AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0;
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group
EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount
EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event
EPwm1Regs.CMPA.half.CMPA = 6; // Set compare A value
EPwm1Regs.TBPRD = 12; // Set period for ePWM1
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
// Enable ADCINT in PIE
PieCtrlRegs.PIEIER1.bit.INTx6 = 1;
IER |= M_INT1; // Enable CPU Interrupt 1
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
Feng Youkui Feng Youkui：
回复 10#:
如果使用查询方式 采样频率是否可以达到12.5M，主要担心程序在flash中的执行时间没有那么快，如果达不到改怎么处理才可以达到12.5M， 程序如下
AdcRegs.ADCTRL1.bit.ACQ_PS = 0; // 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 = 0; AdcRegs.ADCTRL1.bit.SEQ_CASC = 1; // 1 Cascaded mode AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0; AdcRegs.ADCTRL1.bit.CONT_RUN = 1; // Setup continuous run
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 0; // Enable Sequencer override feature AdcRegs.ADCCHSELSEQ1.all = 0x0; // Initialize all ADC channel selects to A0 AdcRegs.ADCCHSELSEQ2.all = 0x0; AdcRegs.ADCCHSELSEQ3.all = 0x0; AdcRegs.ADCCHSELSEQ4.all = 0x0; AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x0; // convert and store in 8 results registers
// Start SEQ1 AdcRegs.ADCTRL2.all = 0x2000;
for(;;) { // Take ADC data and log them in SampleTable array
array_index = 0; for (i=0; i<(BUF_SIZE); i++) { while (AdcRegs.ADCST.bit.INT_SEQ1== 0){}
AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;
AdcBuf[array_index++]= ( (AdcRegs.ADCRESULT0)>>4);
} }
还有一个问题 如果设置多通道连续采样，采样频率是如何计算的，比如设置采样频率是12.5M 8通道连续采样，
AdcRegs.ADCTRL1.bit.ACQ_PS = 0; // 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 = 0;AdcRegs.ADCTRL1.bit.SEQ_CASC = 1; // 1 Cascaded modeAdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0;AdcRegs.ADCTRL1.bit.CONT_RUN = 1; // Setup continuous run
AdcRegs.ADCTRL1.bit.SEQ_OVRD = 0; // Enable Sequencer override featureAdcRegs.ADCCHSELSEQ1.all = 0x0; // Initialize all ADC channel selects to A0AdcRegs.ADCCHSELSEQ2.all = 0x0;AdcRegs.ADCCHSELSEQ3.all = 0x0;AdcRegs.ADCCHSELSEQ4.all = 0x0;AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0x7; // convert and store in 8 results registers
// Start SEQ1AdcRegs.ADCTRL2.all = 0x2000;
for(;;){ // Take ADC data and log them in SampleTable array
array_index = 0;for (i=0; i<(BUF_SIZE); i++){while (AdcRegs.ADCST.bit.INT_SEQ1== 0){}//在这里是12.5MHz/8的时间吗？
AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;
AdcBuf[array_index++]= ( (AdcRegs.ADCRESULT0)>>4);
AdcBuf[array_index++]= ( (AdcRegs.ADCRESULT1)>>4);
AdcBuf[array_index++]= ( (AdcRegs.ADCRESULT2)>>4);
AdcBuf[array_index++]= ( (AdcRegs.ADCRESULT3)>>4);
AdcBuf[array_index++]= ( (AdcRegs.ADCRESULT4)>>4);
AdcBuf[array_index++]= ( (AdcRegs.ADCRESULT5)>>4);
AdcBuf[array_index++]= ( (AdcRegs.ADCRESULT6)>>4);
AdcBuf[array_index++]= ( (AdcRegs.ADCRESULT7)>>4);
}}
