[问答]

使用ADS7865与DSP28335配合进行双通道信号采集，输入端接地后用CCS调试，采集数据结果为随机数，为什么？

问答对人有帮助，内容完整，我也想知道答案 0 我使用ADS7865与DSP28335配合进行双通道信号采集，现输入端接地后用CCS调试，采集数据结果为随机数，怀疑是程序时序问题，但不知道具体问题在哪里。 ADS7865采用32M外部有源晶振，CS#管脚接地，RD#WR#分别连接DSP28335XINTF的XRDn、XWE0n，BUSY管脚连接DSP28335的16管脚（GPIO7/EPWM4B/MCLKRA/ECAP2），CONVST#管脚连接有问题，连接的DSP28335的152管脚（GPIO41/XA1），在使用XINTF模块时只能作为地址线，所以程序中用写地址来对CONVST进行置高置低。现调试配置ADS7865内部DAC参考电压，发现可以成功配置，排除了读写方式的问题。器件原理图及晶振波形图见附件。 AD程序如下，输入管脚接地，数据为随机数： #include "DSP28x_Project.h" // Device Headerfile and Examples Include File #define LED GpioDataRegs.GPADAT.bit.GPIO20 // Basic pinout configuration example // Configure the period for AD Uint16 add = (Uint16 ) 0x200002; Uint16 temp; //============================================================================================== interrupt void epwm1_timer_isr(void); void Init_epwm1_timer(void); void init_zone7(void); void init_Gpio(void); //============================================================================================== Uint16 VoltageA[5]; Uint16 VoltageB[5]; void main(void) { Uint16 i=0,k=0; for(i=0;i<5;i++) { VoltageA=0; VoltageB=0; } // Step 1. Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP2833x_SysCtrl.c file. InitSysCtrl(); // 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 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; // This is needed to write to EALLOW protected registers // PieVectTable.EPWM1_INT = &epwm1_timer_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 // Init_epwm1_timer(); // For this example, only initialize the ePWM Timers // Step 5. User specific code: // This example is a basic pinout init_Gpio(); init_zone7(); // IER \|= M_INT3; // Enable EPWM INTn in the PIE: Group 3 interrupt 1-6 // PieCtrlRegs.PIEIER3.bit.INTx1 = 1; // Enable global Interrupts and higher priority real-time debug events: EINT; // Enable Global interrupt INTM ERTM; // Enable Global realtime interrupt DBGM // Step 6. IDLE loop. Just sit and loop forever (optional): i=0; while(GpioDataRegs.GPADAT.bit.GPIO7 !=0){}//ABUSY add=0x1000; //指令 0x100h,,,CONVST=1; // temp=(add); for(k=0;k<10;k++) { temp=(add-2); //CONVST=0; 启动保持和转换上一次结果 } while(GpioDataRegs.GPADAT.bit.GPIO7 !=0){} temp=(add); //CONVST=1; 启动保持和转换 for(;;) { for(k=0;k<10;k++) { temp=(add-2); //CONVST=0; 启动保持和转换上一次结果 } while(GpioDataRegs.GPADAT.bit.GPIO7 !=0){} VoltageA=(add >>4); for(k=0;k<10;k++) ; VoltageB[i++]=(add >>4); if(i==5) i=0; } } void Init_epwm1_timer() { EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; // Stop all the TB clocks EDIS; // Setup Sync //EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // Pass through // Allow each timer to be sync'ed //EPwm1Regs.TBCTL.bit.HSPCLKDIV=3; //EPwm1Regs.TBCTL.bit.CLKDIV=1; //epwm1clk=1/12systemclk EPwm1Regs.TBCTL.bit.HSPCLKDIV=3; EPwm1Regs.TBCTL.bit.CLKDIV=0; //epwm1clk=1/6systemclk EPwm1Regs.TBPRD = 50000/10; EPwm1Regs.TBCTL.bit.CTRMODE = 0; // Count up EPwm1Regs.ETSEL.bit.INTSEL = 2; // Select INT on Zero event EPwm1Regs.ETSEL.bit.INTEN = 1; // Enable INT EPwm1Regs.ETPS.bit.INTPRD = 1; // Generate INT on 1st event EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; // Start all the timers synced EDIS; } // Interrupt routines uses in this example interrupt void epwm1_timer_isr(void) { LED=~LED; add=0x0000; // while(GpioCtrlRegs.GPADAT.bit.GPIO7 !=0) { }//ABUSY // Check against sent data /* temp=add; voltageA[count]=temp>>4; temp=add; voltageB[count]=temp>>4; Count=Count+1; if (Count>=500) //end of an interrogation { Count=0; }/ //==================================================================== // Clear INT flag for this timer EPwm1Regs.ETCLR.bit.INT = 1; // Acknowledge this interrupt to receive more interrupts from group 3 PieCtrlRegs.PIEACK.all = PIEACK_GROUP3; } void init_Gpio(void) { EALLOW; GpioCtrlRegs.GPAMUX1.bit.GPIO7 = 0; // GPIO7 ABUSY GpioCtrlRegs.GPADIR.bit.GPIO7 = 0; // GPIO7 = input GpioCtrlRegs.GPAMUX2.bit.GPIO20 = 0; // GPIO20 GpioCtrlRegs.GPADIR.bit.GPIO20 = 1; // GPIO20 = output EDIS; } void init_zone7(void) { // Make sure the XINTF clock is enabled SysCtrlRegs.PCLKCR3.bit.XINTFENCLK = 1; // Configure the GPIO for XINTF with a 16-bit data bus // This function is in DSP2833x_Xintf.c InitXintf16Gpio(); EALLOW; // All Zones--------------------------------- // Timing for all zones based on XTIMCLK = SYSCLKOUT XintfRegs.XINTCNF2.bit.XTIMCLK = 0; // Buffer up to 3 writes XintfRegs.XINTCNF2.bit.WRBUFF = 3; // XCLKOUT is enabled XintfRegs.XINTCNF2.bit.CLKOFF = 0; // XCLKOUT = XTIMCLK XintfRegs.XINTCNF2.bit.CLKMODE = 0; // Disable XHOLD to prevent XINTF bus from going into high impedance state // whenever TZ3 signal goes low. This occurs because TZ3 on GPIO14 is // shared with HOLD of XINTF XintfRegs.XINTCNF2.bit.HOLD = 1; // Zone 7------------------------------------ // When using ready, ACTIVE must be 1 or greater // Lead must always be 1 or greater // Zone write timing XintfRegs.XTIMING7.bit.XWRLEAD = 1; XintfRegs.XTIMING7.bit.XWRACTIVE = 2; XintfRegs.XTIMING7.bit.XWRTRAIL = 1; // Zone read timing XintfRegs.XTIMING7.bit.XRDLEAD = 1; XintfRegs.XTIMING7.bit.XRDACTIVE = 3; XintfRegs.XTIMING7.bit.XRDTRAIL = 0; // don't double all Zone read/write lead/active/trail timing XintfRegs.XTIMING7.bit.X2TIMING = 0; // Zone will not sample XREADY signal XintfRegs.XTIMING7.bit.USEREADY = 0; XintfRegs.XTIMING7.bit.READYMODE = 0; // 1,1 = x16 data bus // 0,1 = x32 data bus // other values are reserved XintfRegs.XTIMING7.bit.XSIZE = 3; EDIS; //Force a pipeline flush to ensure that the write to //the last register configured occurs before returning. __asm(" RPT #7 \|\| NOP"); } //=========================================================================== // No more. //=========================================================================== 配置参考电压程序如下，测量得REFOUT电压正确改变： #include "DSP28x_Project.h" // Device Headerfile and Examples Include File // Configure the period for AD Uint16 add = (Uint16 ) 0x200002; Uint16 temp; //============================================================================================== interrupt void epwm1_timer_isr(void); void Init_epwm1_timer(void); void init_zone7(void); void init_Gpio(void); //============================================================================================== void main(void) { Uint16 k=0; // Step 1. Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP2833x_SysCtrl.c file. InitSysCtrl(); // 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 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; // This is needed to write to EALLOW protected registers // PieVectTable.EPWM1_INT = &epwm1_timer_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 // Init_epwm1_timer(); // For this example, only initialize the ePWM Timers // Step 5. User specific code: // This example is a basic pinout init_Gpio(); init_zone7(); // IER \|= M_INT3; // Enable EPWM INTn in the PIE: Group 3 interrupt 1-6 // PieCtrlRegs.PIEIER3.bit.INTx1 = 1; // Enable global Interrupts and higher priority real-time debug events: EINT; // Enable Global interrupt INTM ERTM; // Enable Global realtime interrupt DBGM // Step 6. IDLE loop. Just sit and loop forever (optional): while(GpioDataRegs.GPADAT.bit.GPIO7 !=0){} add=0x1010; //指令 0x101h add=0x1FD0; //DAC1.240V for(k=0;k<10;k++) ; add=0x1030; //指令 0x103h add=0x1FD0; //DAC1.240V for(;;) { } } void Init_epwm1_timer() { EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; // Stop all the TB clocks EDIS; // Setup Sync //EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // Pass through // Allow each timer to be sync'ed //EPwm1Regs.TBCTL.bit.HSPCLKDIV=3; //EPwm1Regs.TBCTL.bit.CLKDIV=1; //epwm1clk=1/12systemclk EPwm1Regs.TBCTL.bit.HSPCLKDIV=3; EPwm1Regs.TBCTL.bit.CLKDIV=0; //epwm1clk=1/6systemclk EPwm1Regs.TBPRD = 50000/10; EPwm1Regs.TBCTL.bit.CTRMODE = 0; // Count up EPwm1Regs.ETSEL.bit.INTSEL = 2; // Select INT on Zero event EPwm1Regs.ETSEL.bit.INTEN = 1; // Enable INT EPwm1Regs.ETPS.bit.INTPRD = 1; // Generate INT on 1st event EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; // Start all the timers synced EDIS; } // Interrupt routines uses in this example interrupt void epwm1_timer_isr(void) { // Clear INT flag for this timer EPwm1Regs.ETCLR.bit.INT = 1; // Acknowledge this interrupt to receive more interrupts from group 3 PieCtrlRegs.PIEACK.all = PIEACK_GROUP3; } void init_Gpio(void) { EALLOW; GpioCtrlRegs.GPAMUX1.bit.GPIO7 = 0; // GPIO7 ABUSY GpioCtrlRegs.GPADIR.bit.GPIO7 = 0; // GPIO7 = input GpioCtrlRegs.GPAMUX2.bit.GPIO20 = 0; // GPIO20 GpioCtrlRegs.GPADIR.bit.GPIO20 = 1; // GPIO20 = output EDIS; } void init_zone7(void) { // Make sure the XINTF clock is enabled SysCtrlRegs.PCLKCR3.bit.XINTFENCLK = 1; // Configure the GPIO for XINTF with a 16-bit data bus // This function is in DSP2833x_Xintf.c InitXintf16Gpio(); EALLOW; // All Zones--------------------------------- // Timing for all zones based on XTIMCLK = SYSCLKOUT XintfRegs.XINTCNF2.bit.XTIMCLK = 0; // Buffer up to 3 writes XintfRegs.XINTCNF2.bit.WRBUFF = 3; // XCLKOUT is enabled XintfRegs.XINTCNF2.bit.CLKOFF = 0; // XCLKOUT = XTIMCLK XintfRegs.XINTCNF2.bit.CLKMODE = 0; // Disable XHOLD to prevent XINTF bus from going into high impedance state // whenever TZ3 signal goes low. This occurs because TZ3 on GPIO14 is // shared with HOLD of XINTF XintfRegs.XINTCNF2.bit.HOLD = 1; // Zone 7------------------------------------ // When using ready, ACTIVE must be 1 or greater // Lead must always be 1 or greater // Zone write timing XintfRegs.XTIMING7.bit.XWRLEAD = 1; XintfRegs.XTIMING7.bit.XWRACTIVE = 2; XintfRegs.XTIMING7.bit.XWRTRAIL = 1; // Zone read timing XintfRegs.XTIMING7.bit.XRDLEAD = 1; XintfRegs.XTIMING7.bit.XRDACTIVE = 3; XintfRegs.XTIMING7.bit.XRDTRAIL = 0; // don't double all Zone read/write lead/active/trail timing XintfRegs.XTIMING7.bit.X2TIMING = 0; // Zone will not sample XREADY signal XintfRegs.XTIMING7.bit.USEREADY = 0; XintfRegs.XTIMING7.bit.READYMODE = 0; // 1,1 = x16 data bus // 0,1 = x32 data bus // other values are reserved XintfRegs.XTIMING7.bit.XSIZE = 3; EDIS; __asm(" RPT #7 \|\| NOP"); } 0 本主题由 Harmony技术专家于 2025-1-8 15:58 审核通过*
2025-1-8 08:31:11　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × 新星之火12138 该类别下有 83 个回答。邀请回答 heks 该类别下有 75 个回答。邀请回答 wang21cj 该类别下有 72 个回答。邀请回答普罗旺斯的薰衣草该类别下有 69 个回答。邀请回答 hgimtk 该类别下有 64 个回答。邀请回答 chm5 该类别下有 62 个回答。邀请回答风动影随该类别下有 55 个回答。邀请回答 lksas 该类别下有 54 个回答。邀请回答 zhhx1985 该类别下有 53 个回答。邀请回答站着幻想该类别下有 52 个回答。邀请回答 hfgsd 该类别下有 51 个回答。邀请回答你又知道了该类别下有 50 个回答。邀请回答青上也该类别下有 50 个回答。邀请回答 zhouxk 该类别下有 50 个回答。邀请回答 kghfh 该类别下有 50 个回答。邀请回答 blueshine 该类别下有 50 个回答。邀请回答 fdhsfagd 该类别下有 50 个回答。邀请回答 ufydsyfsf 该类别下有 49 个回答。邀请回答 dsdfshf 该类别下有 49 个回答。邀请回答深海零下一度1 该类别下有 49 个回答。邀请回答举报费加罗相关推荐 • DSP28335通过SPI模式与AD7606方式采集数据 10589 • ADS7862在REFin管脚和地之间接一个1uf电容，采集不到数据了，为什么？ 324 • 关于DSP**的AD采集与串口通信问题 7212* • ADS7865是否可以实现3+2的通道选择模式吗？ 304 • 是否可以使用DSP28335配合DAC7725进行DA输出？ 437 • ADS1256两个通道之间进行切换，必须需要至少5ms的延时第2通道才能正常读出数据，为什么？ 763 • 数据采集 2985 • 求助大侠，LabVIEW双通道采集数据 3226 • DSP28335 13574 • DSP28335+FPGA+AD7606数据采集系统设计 33931 2个回答

答案对人有帮助，有参考价值 0 配置ADS7865内部DAC参考电压，是不是读写都用到了呢。是的话，读写都可以，时序就应该正确啊。电压值是从寄存器里读出来的吗。读别的寄存器看看是否正常。看看数据是否为原始数据。若原始数据不对。要么是读写操作有问题，要么是发送的指令到接收数据的过程不对。逐一排查一下。分析时序最好看示波器

2025-1-8 15:55:09 评论举报张红

答案对人有帮助，有参考价值 0 根据您的描述，您在使用ADS7865与DSP28335进行双通道信号采集时遇到了采集数据为随机数的问题。以下是一些可能的原因和解决方案： 1. 时序问题：确保您的程序时序正确。检查您的代码，确保在读取数据之前，ADS7865已经完成转换。您可以通过在代码中添加延时来解决这个问题。 2. 连接问题：检查您的硬件连接是否正确。确保所有管脚都已正确连接，并且没有短路或断路。特别是CONVST#管脚，您提到它连接到了DSP28335的152管脚，这可能会导致问题。尝试将CONVST#管脚连接到其他可用的GPIO管脚，并在程序中相应地修改。 3. 电源问题：检查您的电源是否稳定。不稳定的电源可能会导致采集数据为随机数。确保您的电源供应器能够提供足够的电流和电压。 4. 晶振问题：您提到使用了32M外部有源晶振。请确保晶振工作正常，频率稳定。您可以使用示波器检查晶振的输出波形。 5. 代码问题：检查您的代码，确保没有逻辑错误。特别是对ADS7865的读写操作，确保您正确地设置了控制寄存器和数据寄存器。 6. 干扰问题：检查您的电路是否存在电磁干扰。电磁干扰可能会导致采集数据为随机数。您可以尝试使用屏蔽电缆和接地来减少干扰。 7. 软件问题：确保您使用的CCS软件和DSP28335的驱动程序是最新的。软件问题可能会导致采集数据为随机数。综上所述，您需要逐步排查以上可能的原因，找到问题所在，并进行相应的修复。希望这些建议能帮助您解决问题。

2025-1-9 18:02:55 评论举报 jjll652