Example_281xAdcSoc.c
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- //###########################################################################
- //
- // FILE: Example_281xAdc.c
- //
- // TITLE: DSP281x ADC Example Program.
- //
- // ASSUMPTIONS:
- //
- // This program requires the DSP281x V1.00 header files.
- // As supplied, this project is configured for "boot to H0" operation.
- //
- // Make sure the CPU clock speed is properly defined in
- // DSP281x_Examples.h before compiling this example.
- //
- // Connect signals to be converted to A2 and A3.
- //
- //
- // DESCRIPTION:
- //
- // 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.
- //
- // Watch Variables:
- //
- // Voltage1[10] Last 10 ADCRESULT0 values
- // Voltage2[10] Last 10 ADCRESULT1 values
- // ConversionCount Current result number 0-9
- // LoopCount Idle loop counter
- //
- //
- //###########################################################################
- //
- // 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)
- // | | | Cleanup only. Results are shifted >> 4
- //###########################################################################
- #include "DSP281x_Device.h" // DSP281x Headerfile Include File
- #include "DSP281x_Examples.h" // DSP281x 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;
- Uint16 Voltage1[10];
- Uint16 Voltage2[10];
- 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();
- // 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
- // 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; // Enable Global interrupt INTM
- ERTM; // Enable Global realtime interrupt DBGM
- 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; // Setup T1 compare value
- EvaRegs.T1PR = 0xFFFF; // Setup period register
- EvaRegs.GPTCONA.bit.T1TOADC = 1; // Enable EVASOC in EVA
- EvaRegs.T1CON.all = 0x1042; // Enable timer 1 compare (upcount mode)
- // Wait for ADC interrupt
- while(1)
- {
- LoopCount++;
- }
- }
- 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; // Reset SEQ1
- AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1; // Clear INT SEQ1 bit
- PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; // Acknowledge interrupt to PIE
-
- return;
- }