AD的简单例子

ConversionCount Current result number 0-9
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//############################################################## ############# #include "DSP281x_Device.h" #include "DSP281x_Examples.h" // DSP281x Headerfile Include File // DSP281x Examples Include File
// 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 DSP281x_DefaultIsr.c. // This function is found in DSP281x_PieVect.c. InitPieVectTable(); // 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
//########################################################### ################ // // FILE: // // TITLE: DSP281x ADC Example Program. // // ASSUMPTIONS: // // // // // // // // // // // DESCRIPTION: // // // // // // // // // // // // // // // // //############################################################## ############# // // Original Author: D.F. // // Ver | dd mmm yyyy | Who | Description of changes // =====|=============|======|==================================== =========== // 1.00| 11 Sep 2003 | L.H. | Changes since previous version (v.58 Alpha) Voltage1[10] Voltage2[10] LoopCount Last 10 ADCRESULT0 values Last 10 ADCRESULT1 values Idle loop counter Watch Variables: This example sets up the PLL in x10/2 mode, divides SYSCLKOUT by six to reach a 25Mhz HSPCLK (assuming a 30Mhz XCLKIN). The clock divider in the ADC is not used so that the ADC will see the 25Mhz on the HSPCLK. Interrupts are enabled and the EVA is setup to generate a periodic ADC SOC on SEQ1. Two channels are converted, ADCINA3 and ADCINA2. Connect signals to be converted to A2 and A3. Make sure the CPU clock speed is properly defined in DSP281x_Examples.h before compiling this example. This program requires the DSP281x V1.00 header files. As supplied, this project is configured for "boot to H0" operation. Example_281xAdc.c
LoopCount = 0; ConversionCount = 0; // Configure ADC AdcRegs.ADCMAXCONV.all = 0x0001; // Setup 2 conv's on SEQ1 AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x3; // Setup ADCINA3 as 1st SEQ1 conv. AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x2; // Setup ADCINA2 as 2nd SEQ1 conv. AdcRegs.ADCTRL2.bit.EVA_SOC_SEQ1 = 1; // Enable EVASOC to start SEQ1 AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS) // Configure EVA // Assumes EVA Clock is already enabled in InitSysCtrl(); EvaRegs.T1CMPR = 0x0080; EvaRegs.T1PR = 0xFFFF; // Setup T1 compare value // Setup period register
// Prototype statements for functions found within this file. interrupt void adc_isr(void); // Global variables used in this example: Uint16 LoopCount; Uint16 ConversionCount; Uint16 Voltage1[10]; Uint16 Voltage2[10];
EvaRegs.GPTCONA.bit.T1TOADC = 1; EvaRegs.T1CON.all = 0x1042; // Wait for ADC interrupt while(1) { LoopCount++; } }
// Enable EVASOC in EVA // Enable timer 1 compare (upcount mode)
Biblioteka Baidu
interrupt void adc_isr(void) { Voltage1[ConversionCount] = AdcRegs.ADCRESULT0 >>4; Voltage2[ConversionCount] = AdcRegs.ADCRESULT1 >>4; // If 40 conversions have been logged, start over if(ConversionCount == 9) { ConversionCount = 0; } else ConversionCount++; // Reinitialize for next ADC sequence AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1; AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1; PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; return; } // Reset SEQ1 // Clear INT SEQ1 bit // Acknowledge interrupt to PIE
main() { // Step 1. Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP281x_SysCtrl.c file. InitSysCtrl(); // For this example, set HSPCLK to SYSCLKOUT / 6 (25Mhz assuming 150Mhz SYSCLKOUT) EALLOW; SysCtrlRegs.HISPCP.all = 0x3; // HSPCLK = SYSCLKOUT/6 EDIS; // Step 2. Initialize GPIO: // This example function is found in the DSP281x_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 DSP281x_PieCtrl.c file. InitPieCtrl();
// Step 4. Initialize all the Device Peripherals: // This function is found in DSP281x_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; ERTM; // Enable Global interrupt INTM // Enable Global realtime interrupt DBGM