//###########################################################################
//
// 文件名: Example_2833xAdc.c
//
// 连接信号到转换通道A0和A1
//
// 根据在RAM中调试的需要，这个项目配置成"boot to SARAM".2833x引导模式
// 表如下显示. 常用的还有"boot to Flash"模式，当程序在RAM调试完善后就
// 可以将代码烧进Flash中并使用"boot to Flash"引导模式.
//
// $Boot_Table:
//
// GPIO87 GPIO86 GPIO85 GPIO84
// XA15 XA14 XA13 XA12
// PU PU PU PU
// ==========================================
// 1 1 1 1 Jump to Flash
// 1 1 1 0 SCI-A boot
// 1 1 0 1 SPI-A boot
// 1 1 0 0 I2C-A boot
// 1 0 1 1 eCAN-A boot
// 1 0 1 0 McBSP-A boot
// 1 0 0 1 Jump to XINTF x16
// 1 0 0 0 Jump to XINTF x32
// 0 1 1 1 Jump to OTP
// 0 1 1 0 Parallel GPIO I/O boot
// 0 1 0 1 Parallel XINTF boot
// 0 1 0 0 Jump to SARAM <- "boot to SARAM"
// 0 0 1 1 Branch to check boot mode
// 0 0 1 0 Boot to flash, bypass ADC cal
// 0 0 0 1 Boot to SARAM, bypass ADC cal
// 0 0 0 0 Boot to SCI-A, bypass ADC cal
// Boot_Table_End$
//
// 功能描述:
//
// CPU系统时钟为150MHz，高速时钟等于
// 系统时钟除以6为25MHz
//
// ePWM1设置为在技术到比较寄存器值时产生SEQ1转换触发信号，
// ADC两通道ADCINA0和ADCINA1完成转换后产生中断，在中断子程序中
// 分别提取ADC的采样值
//
// 观察变量:
//
// Voltage1[10] 上10个ADCRESULT0值
// Voltage2[10] 上10个ADCRESULT1值
// ConversionCount 当前结果堆栈的数字（0-9）
// LoopCount 无限循环计数
//
//
#include "DSP2833x_Device.h" // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File
// Prototype statements for functions found within this file.
interrupt void adc_isr(void);
// Global variables used in this example:
Uint16 LoopCount;
Uint16 ConversionCount=0;
//Uint16 count = 0;
Uint16 Voltage1[100];
//Uint16 Voltage2[100];
//Uint16 Voltage3[100];
//Uint16 Voltage4[100];
float multi = 1.0/4096.0*3.0;
float v1[100];
#define ADC_MODCLK 0x3 // HSPCLK = SYSCLKOUT/2*ADC_MODCLK2 = 150/(2*3) = 25.0 MHz
main()
{
// 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/（2*ADC_MODCLK）=25MHZ
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
// 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();
EALLOW;
GpioCtrlRegs.GPAPUD.bit.GPIO0 = 0; // Enable pull-up on GPIO0 (EPWM1A)
GpioCtrlRegs.GPAPUD.bit.GPIO1 = 0;
GpioCtrlRegs.GPAMUX1.bit.GPIO0=1;
GpioCtrlRegs.GPADIR.bit.GPIO0=1;
GpioCtrlRegs.GPAMUX1.bit.GPIO1=1;
GpioCtrlRegs.GPADIR.bit.GPIO1=1;
EDIS;
// 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
// 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
// Step 5. User specific code, enable interrupts:
// 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
LoopCount = 0;
ConversionCount = 0;
// Configure ADC
AdcRegs.ADCMAXCONV.all = 0x0003; // Setup 2 conv's on SEQ1
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0; // Setup ADCINA0 as 1st SEQ1 conv.
AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1;
AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x8;
AdcRegs.ADCCHSELSEQ1.bit.CONV03 = 0x2;
// Setup ADCINA1 as 2nd SEQ1 conv.
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)
// Assumes ePWM1 clock is already enabled in InitSysCtrl();
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 =0x0080; //0x0080; // Set compare A value
//EPwm1Regs.TBPRD = 0xffff; // Set period for ePWM1
EPwm1Regs.CMPA.half.CMPA =0x0080;
EPwm1Regs.TBPRD = 0xffff;
EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start
// Wait for ADC interrupt
for(;;)
{
LoopCount++;
}
}
//float v2[100];
//float v3[100];
//float v4[100];
interrupt void adc_isr(void)
{
AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1; // Reset SEQ1
Voltage1[ConversionCount] = ( (AdcRegs.ADCRESULT0)>>4);
v1[ConversionCount]= Voltage1[ConversionCount] * multi;
// Voltage2[ConversionCount] = ( (AdcRegs.ADCRESULT1)>>4);
// v2[ConversionCount]= Voltage2[ConversionCount] * multi;
// Voltage3[ConversionCount] = ( (AdcRegs.ADCRESULT2)>>4);
// v3[ConversionCount]= Voltage3[ConversionCount] * multi;
// Voltage4[ConversionCount] = ( (AdcRegs.ADCRESULT3)>>4);
// v4[ConversionCount]= Voltage4[ConversionCount] * multi;
// If 40 conversions have been logged, start over
if(ConversionCount == 100)
{
ConversionCount = 0;
}
else
ConversionCount++;
// Reinitialize for next ADC sequence
AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1; // Clear INT SEQ1 bit
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; // Acknowledge interrupt to PIE
// return;
}
请问这个程序ADC采样频率怎么确定的？什么时候开始启动adc转换
