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硬體使用的是 LAUNCHXL-F280049C LaunchPad Kit
目前參考的文件為SPRUI33C
參考的程式範例為
"C2000ware_2_00_00_02/driverlib/f28004x/examples/adc/adc_ex1_soc_software"
"C2000ware_2_00_00_02/driverlib/f28004x/examples/adc/adc_ex2_soc_epwm"
"C2000ware_2_00_00_02/driverlib/f28004x/examples/adc/adc_ex3_temp_sensor"
讀取的值會有亂跳的現象,以及當我同時使用ADCA, ADCB, ADCC BASE 會有一些通道並沒有辦法讀取資料
可否請教有人可以教教我讀取ADC
程式碼如下:
void initADCs(void)
{
//
// Setup VREF as internal
//
ADC_setVREF(ADCA_BASE, ADC_REFERENCE_INTERNAL, ADC_REFERENCE_3_3V);
ADC_setVREF(ADCB_BASE, ADC_REFERENCE_INTERNAL, ADC_REFERENCE_3_3V);
ADC_setVREF(ADCC_BASE, ADC_REFERENCE_INTERNAL, ADC_REFERENCE_3_3V);
//
// Set ADCCLK divider to /4
//
ADC_setPrescaler(ADCA_BASE, ADC_CLK_DIV_1_0);
ADC_setPrescaler(ADCB_BASE, ADC_CLK_DIV_1_0);
ADC_setPrescaler(ADCC_BASE, ADC_CLK_DIV_1_0);
//
// Set pulse positions to late
//
ADC_setInterruptPulseMode(ADCA_BASE, ADC_PULSE_END_OF_CONV);
ADC_setInterruptPulseMode(ADCB_BASE, ADC_PULSE_END_OF_CONV);
ADC_setInterruptPulseMode(ADCC_BASE, ADC_PULSE_END_OF_CONV);
//
// Power up the ADC and then delay for 1 ms
//
ADC_enableConverter(ADCA_BASE);
ADC_enableConverter(ADCB_BASE);
ADC_enableConverter(ADCC_BASE);
DEVICE_DELAY_US(1000);
}
void initADCSOCs(void)
{
//
// Configure SOC0 of ADCA to convert pin A0 with a sample window of 10
// SYSCLK cycles. The EPWM1SOCA signal will be the trigger.
//
ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM1_SOCA,
ADC_CH_ADCIN0, 10);
ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM1_SOCA,
ADC_CH_ADCIN2, 10);
//
// Set SOC1 to set the interrupt 1 flag. Enable the interrupt and make
// sure its flag is cleared.
//
ADC_setInterruptSource(ADCA_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER1);
ADC_enableInterrupt(ADCA_BASE, ADC_INT_NUMBER1);
ADC_clearInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1);
ADC_setupSOC(ADCB_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM1_SOCA,
ADC_CH_ADCIN2, 10);
ADC_setupSOC(ADCB_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM1_SOCA,
ADC_CH_ADCIN3, 10);
//
// Set SOC1 to set the interrupt 1 flag. Enable the interrupt and make
// sure its flag is cleared.
//
ADC_setInterruptSource(ADCB_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER1);
ADC_enableInterrupt(ADCB_BASE, ADC_INT_NUMBER1);
ADC_clearInterruptStatus(ADCB_BASE, ADC_INT_NUMBER1);
}
ADC_forceSOC(ADCA_BASE, ADC_SOC_NUMBER0);
ADC_forceSOC(ADCA_BASE, ADC_SOC_NUMBER2);
ADC_forceSOC(ADCB_BASE, ADC_SOC_NUMBER2);
ADC_forceSOC(ADCB_BASE, ADC_SOC_NUMBER3);
ADC_forceSOC(ADCC_BASE, ADC_SOC_NUMBER4);
adcBResult3 = (AdcbResultRegs.ADCRESULT3);
for(Delay_FOR_ANY=0; Delay_FOR_ANY<1; Delay_FOR_ANY++){}
adcAResult0 = (AdcaResultRegs.ADCRESULT0);
for(Delay_FOR_ANY=0; Delay_FOR_ANY<1; Delay_FOR_ANY++){}
adcAResult2 = (AdcaResultRegs.ADCRESULT2);
for(Delay_FOR_ANY=0; Delay_FOR_ANY<1; Delay_FOR_ANY++){}
adcAResult6 = (AdcaResultRegs.ADCRESULT6);
for(Delay_FOR_ANY=0; Delay_FOR_ANY<1; Delay_FOR_ANY++){}
adcBResult2 = (AdcbResultRegs.ADCRESULT2);
for(Delay_FOR_ANY=0; Delay_FOR_ANY<1; Delay_FOR_ANY++){}
adcCResult0 = (AdccResultRegs.ADCRESULT0);
for(Delay_FOR_ANY=0; Delay_FOR_ANY<1; Delay_FOR_ANY++){}
adcCResult2 = (AdccResultRegs.ADCRESULT2);
for(Delay_FOR_ANY=0; Delay_FOR_ANY<1; Delay_FOR_ANY++){}
//AdcbRegs.ADCOFFTRIM.bit.OFFTRIM = addoffset;
adcAResult0 = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER0);
adcAResult2 = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER2);
adcAResult6 = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER6);
adcBResult2 = ADC_readResult(ADCBRESULT_BASE, ADC_SOC_NUMBER2);
adcBResult3 = ADC_readResult(ADCBRESULT_BASE, ADC_SOC_NUMBER3);
adcCResult0 = ADC_readResult(ADCCRESULT_BASE, ADC_SOC_NUMBER0);
adcCResult2 = ADC_readResult(ADCCRESULT_BASE, ADC_SOC_NUMBER2);
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
您现在是同时测量吗?建议您单个通道一个个的试一下是否可以正常采样
另外建议您对照下面的代码
//########################################################################### // // FILE: adc_ex1_soc_software.c // // TITLE: ADC software triggering for f2838x. // //! \addtogroup cpu01_example_list //! <h1> ADC SOC Software Force (adc_soc_software)</h1> //! //! This example converts some voltages on ADCA and ADCB based on a software //! trigger. //! //! After the program runs, the memory will contain: //! //! - \b AdcaResult0 \b: a digital representation of the voltage on pin A2\n //! - \b AdcaResult1 \b: a digital representation of the voltage on pin A3\n //! - \b AdcbResult0 \b: a digital representation of the voltage on pin B2\n //! - \b AdcbResult1 \b: a digital representation of the voltage on pin B3\n //! //! Note: The software triggers for the two ADCs happen sequentially, so the //! two ADCs will run asynchronously. //! // //########################################################################### // $TI Release: F2838x Support Library v3.01.00.00 $ // $Release Date: Thu Mar 19 07:48:04 IST 2020 $ // $Copyright: // Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/ // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions // are met: // // Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // // Redistributions in binary form must reproduce the above copyright // notice, this list of conditions and the following disclaimer in the // documentation and/or other materials provided with the // distribution. // // Neither the name of Texas Instruments Incorporated nor the names of // its contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // $ //########################################################################### // // Included Files // #include "f28x_project.h" // // Function Prototypes // void ConfigureADC(void); void SetupADCSoftware(void); // // Globals // Uint16 AdcaResult0; Uint16 AdcaResult1; Uint16 AdcbResult0; Uint16 AdcbResult1; void main(void) { // // Step 1. Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the f2838x_sysctrl.c file. // InitSysCtrl(); // // Step 2. Initialize GPIO: // This example function is found in the f2838x_gpio.c file and // illustrates how to set the GPIO to it's default state. // InitGpio(); // // 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 f2838x_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 f2838x_defaultisr.c. // This function is found in f2838x_pievect.c. // InitPieVectTable(); // // Enable global Interrupts and higher priority real-time debug events: // EINT; // Enable Global interrupt INTM ERTM; // Enable Global realtime interrupt DBGM // // Configure the ADCs and power them up // ConfigureADC(); // // Setup the ADCs for software conversions // SetupADCSoftware(); // // Take conversions indefinitely in loop // do { // // Convert, wait for completion, and store results // start conversions immediately via software, ADCA // AdcaRegs.ADCSOCFRC1.all = 0x0003; //SOC0 and SOC1 // // Start conversions immediately via software, ADCB // AdcbRegs.ADCSOCFRC1.all = 0x0003; //SOC0 and SOC1 // // Wait for ADCA to complete, then acknowledge flag // while(AdcaRegs.ADCINTFLG.bit.ADCINT1 == 0); AdcaRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; // // Wait for ADCB to complete, then acknowledge flag // while(AdcbRegs.ADCINTFLG.bit.ADCINT1 == 0); AdcbRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; // // Store results // AdcaResult0 = AdcaResultRegs.ADCRESULT0; AdcaResult1 = AdcaResultRegs.ADCRESULT1; AdcbResult0 = AdcbResultRegs.ADCRESULT0; AdcbResult1 = AdcbResultRegs.ADCRESULT1; // // At this point, conversion results are stored in // AdcaResult0, AdcaResult1, AdcbResult0, and AdcbResult1 // // // Software breakpoint, hit run again to get updated conversions // asm(" ESTOP0"); }while(1); } // // ConfigureADC - Write ADC configurations and power up the ADC for both // ADC A and ADC B // void ConfigureADC(void) { EALLOW; // // Write configurations // AdcaRegs.ADCCTL2.bit.PRESCALE = 6; //set ADCCLK divider to /4 AdcbRegs.ADCCTL2.bit.PRESCALE = 6; //set ADCCLK divider to /4 AdcSetMode(ADC_ADCA, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE); AdcSetMode(ADC_ADCB, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE); // // Set pulse positions to late // AdcaRegs.ADCCTL1.bit.INTPULSEPOS = 1; AdcbRegs.ADCCTL1.bit.INTPULSEPOS = 1; // // Power up the ADCs // AdcaRegs.ADCCTL1.bit.ADCPWDNZ = 1; AdcbRegs.ADCCTL1.bit.ADCPWDNZ = 1; // // Delay for 1ms to allow ADC time to power up // DELAY_US(1000); EDIS; } // // SetupADCSoftware - Setup ADC channels and acquisition window // void SetupADCSoftware(void) { Uint16 acqps; // // Determine minimum acquisition window (in SYSCLKS) based on resolution // if(ADC_RESOLUTION_12BIT == AdcaRegs.ADCCTL2.bit.RESOLUTION) { acqps = 14; //75ns } else //resolution is 16-bit { acqps = 63; //320ns } // // Select the channels to convert and end of conversion flag // ADCA // EALLOW; AdcaRegs.ADCSOC0CTL.bit.CHSEL = 2; //SOC0 will convert pin A2 AdcaRegs.ADCSOC0CTL.bit.ACQPS = acqps; //sample window is acqps + //1 SYSCLK cycles AdcaRegs.ADCSOC1CTL.bit.CHSEL = 3; //SOC1 will convert pin A3 AdcaRegs.ADCSOC1CTL.bit.ACQPS = acqps; //sample window is acqps + //1 SYSCLK cycles AdcaRegs.ADCINTSEL1N2.bit.INT1SEL = 1; //end of SOC1 will set INT1 flag AdcaRegs.ADCINTSEL1N2.bit.INT1E = 1; //enable INT1 flag AdcaRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //make sure INT1 flag is cleared //ADCB AdcbRegs.ADCSOC0CTL.bit.CHSEL = 2; //SOC0 will convert pin B2 AdcbRegs.ADCSOC0CTL.bit.ACQPS = acqps; //sample window is acqps + //1 SYSCLK cycles AdcbRegs.ADCSOC1CTL.bit.CHSEL = 3; //SOC1 will convert pin B3 AdcbRegs.ADCSOC1CTL.bit.ACQPS = acqps; //sample window is acqps + //1 SYSCLK cycles AdcbRegs.ADCINTSEL1N2.bit.INT1SEL = 1; //end of SOC1 will set INT1 flag AdcbRegs.ADCINTSEL1N2.bit.INT1E = 1; //enable INT1 flag AdcbRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //make sure INT1 flag is cleared EDIS; } // // End of file //
變更ADC設定
//
// Configure SOC0 of ADCA to convert pin A0 with a sample window of 10
// SYSCLK cycles. The EPWM1SOCA signal will be the trigger.
//
ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM1_SOCA,
ADC_CH_ADCIN0, 39);
ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER2, ADC_TRIGGER_EPWM1_SOCA,
ADC_CH_ADCIN2, 39);
ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER6, ADC_TRIGGER_EPWM1_SOCA,
ADC_CH_ADCIN6, 39);
ADC_setupSOC(ADCB_BASE, ADC_SOC_NUMBER2, ADC_TRIGGER_EPWM1_SOCA,
ADC_CH_ADCIN2, 39);
ADC_setupSOC(ADCB_BASE, ADC_SOC_NUMBER3, ADC_TRIGGER_EPWM1_SOCA,
ADC_CH_ADCIN3, 39);
ADC_setupSOC(ADCC_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM1_SOCA,
ADC_CH_ADCIN0, 39);
ADC_setupSOC(ADCC_BASE, ADC_SOC_NUMBER2, ADC_TRIGGER_EPWM1_SOCA,
ADC_CH_ADCIN2, 39);
每個通道皆可以讀取資料,不過資料有誤,通道A0輸入3.3V時並沒有回傳4095而是21XX,且會浮動。