[参考译文] TMDSCNCD2.8335万：采用Matlab Coder的采样时间ADC

Matthew，您好！

以下是客户的回应。

提前感谢您的帮助。 我已经附上了采样时间2us和1us的代码。 我不确定主代码是否足够，所以我附上了整个导出代码，我希望这不是问题。

我不知道这些附加信息是否有帮助：
两个独立的GPIO驱动板上的两个LED，其应以0.5Hz的频率闪烁。 如果我将采样时间设置为20us，我可以看到它们闪烁。 将采样时间减少到2us，展位LED保持亮起(我测量到切换速度不快)。

此致，

乔纳森

乔纳森
客户是否发送了代码以附加到开机自检？  我看不到附件。

最佳，

Matthew

你好Matthew

非常感谢您的帮助，并对通信带来的不便深表歉意。 我在获得适当的论坛访问权限时遇到了问题。

我不知道主代码是否足以让您说出一些信息，但我将从这开始。 否则，我现在就在身边了。

此致，

Marius

具有2us采样时间的工作代码：

/*
 * Academic License - for use in teaching, academic research, and meeting
 * course requirements at degree granting institutions only.  Not for
 * government, commercial, or other organizational use.
 *
 * File: Test_Sampling_Time.c
 *
 * Code generated for Simulink model 'Test_Sampling_Time'.
 *
 * Model version                  : 1.2
 * Simulink Coder version         : 9.5 (R2021a) 14-Nov-2020
 * C/C++ source code generated on : Fri Apr 29 11:13:56 2022
 *
 * Target selection: ert.tlc
 * Embedded hardware selection: Texas Instruments->C2000
 * Code generation objectives: Unspecified
 * Validation result: Not run
 */

#include "Test_Sampling_Time.h"
#include "Test_Sampling_Time_private.h"

/* Block signals (default storage) */
B_Test_Sampling_Time_T Test_Sampling_Time_B;

/* Block states (default storage) */
DW_Test_Sampling_Time_T Test_Sampling_Time_DW;

/* Real-time model */
static RT_MODEL_Test_Sampling_Time_T Test_Sampling_Time_M_;
RT_MODEL_Test_Sampling_Time_T *const Test_Sampling_Time_M =
  &Test_Sampling_Time_M_;
static void rate_monotonic_scheduler(void);
uint16_T MW_adcInitFlag = 0;

/*
 * Set which subrates need to run this base step (base rate always runs).
 * This function must be called prior to calling the model step function
 * in order to "remember" which rates need to run this base step.  The
 * buffering of events allows for overlapping preemption.
 */
void Test_Sampling_Time_SetEventsForThisBaseStep(boolean_T *eventFlags)
{
  /* Task runs when its counter is zero, computed via rtmStepTask macro */
  eventFlags[1] = ((boolean_T)rtmStepTask(Test_Sampling_Time_M, 1));
}

/*
 *   This function updates active task flag for each subrate
 * and rate transition flags for tasks that exchange data.
 * The function assumes rate-monotonic multitasking scheduler.
 * The function must be called at model base rate so that
 * the generated code self-manages all its subrates and rate
 * transition flags.
 */
static void rate_monotonic_scheduler(void)
{
  /* Compute which subrates run during the next base time step.  Subrates
   * are an integer multiple of the base rate counter.  Therefore, the subtask
   * counter is reset when it reaches its limit (zero means run).
   */
  (Test_Sampling_Time_M->Timing.TaskCounters.TID[1])++;
  if ((Test_Sampling_Time_M->Timing.TaskCounters.TID[1]) > 499999) {/* Sample time: [1.0s, 0.0s] */
    Test_Sampling_Time_M->Timing.TaskCounters.TID[1] = 0;
  }
}

/* Model step function for TID0 */
void Test_Sampling_Time_step0(void)    /* Sample time: [2.0E-6s, 0.0s] */
{
  {                                    /* Sample time: [2.0E-6s, 0.0s] */
    rate_monotonic_scheduler();
  }

  /* S-Function (c280xadc): '<Root>/Current_Meassurement' */
  {
    AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1;  /* Reset SEQ1 module*/
    AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;/*clear INT sequencer*/
    AdcRegs.ADCTRL2.bit.SOC_SEQ1 = 1;  /* Software Trigger*/
    while (AdcRegs.ADCST.bit.INT_SEQ1 == 0) {
    }                                  /*Wait for Sequencer INT bit to clear */

    asm(" RPT #11 || NOP");
    Test_Sampling_Time_B.Current_Meassurement = (AdcRegs.ADCRESULT0) >> 4;
  }

  /* Switch: '<Root>/Switch' incorporates:
   *  Constant: '<Root>/Constant2'
   *  Gain: '<Root>/Gain'
   *  Gain: '<Root>/Gain1'
   *  Sum: '<Root>/Sum'
   */
  if (Test_Sampling_Time_P.Gain1_Gain *
      Test_Sampling_Time_B.Current_Meassurement * Test_Sampling_Time_P.Gain_Gain
      - Test_Sampling_Time_P.Constant2_Value >
      Test_Sampling_Time_P.Switch_Threshold) {
    /* Switch: '<Root>/Switch' incorporates:
     *  Constant: '<Root>/Constant'
     */
    Test_Sampling_Time_B.Switch = Test_Sampling_Time_P.Constant_Value;
  } else {
    /* Switch: '<Root>/Switch' incorporates:
     *  Constant: '<Root>/Constant1'
     */
    Test_Sampling_Time_B.Switch = Test_Sampling_Time_P.Constant1_Value;
  }

  /* End of Switch: '<Root>/Switch' */

  /* S-Function (c280xgpio_do): '<Root>/GPIO 02' */
  {
    if (Test_Sampling_Time_B.Switch)
      GpioDataRegs.GPASET.bit.GPIO2 = 1;
    else
      GpioDataRegs.GPACLEAR.bit.GPIO2 = 1;
  }
}

/* Model step function for TID1 */
void Test_Sampling_Time_step1(void)    /* Sample time: [1.0s, 0.0s] */
{
  /* DiscretePulseGenerator: '<Root>/Pulse Generator1' */
  Test_Sampling_Time_B.PulseGenerator1 = (Test_Sampling_Time_DW.clockTickCounter
    < Test_Sampling_Time_P.PulseGenerator1_Duty) &&
    (Test_Sampling_Time_DW.clockTickCounter >= 0L) ?
    Test_Sampling_Time_P.PulseGenerator1_Amp : 0.0;

  /* DiscretePulseGenerator: '<Root>/Pulse Generator1' */
  if (Test_Sampling_Time_DW.clockTickCounter >=
      Test_Sampling_Time_P.PulseGenerator1_Period - 1.0) {
    Test_Sampling_Time_DW.clockTickCounter = 0L;
  } else {
    Test_Sampling_Time_DW.clockTickCounter++;
  }

  /* S-Function (c280xgpio_do): '<Root>/LED 1' */
  {
    if (Test_Sampling_Time_B.PulseGenerator1)
      GpioDataRegs.GPASET.bit.GPIO31 = 1;
    else
      GpioDataRegs.GPACLEAR.bit.GPIO31 = 1;
  }

  /* Logic: '<Root>/NOT' */
  Test_Sampling_Time_B.NOT = !(Test_Sampling_Time_B.PulseGenerator1 != 0.0);

  /* S-Function (c280xgpio_do): '<Root>/LED2' */
  {
    if (Test_Sampling_Time_B.NOT)
      GpioDataRegs.GPBSET.bit.GPIO34 = 1;
    else
      GpioDataRegs.GPBCLEAR.bit.GPIO34 = 1;
  }
}

/* Model initialize function */
void Test_Sampling_Time_initialize(void)
{
  /* Registration code */

  /* initialize real-time model */
  (void) memset((void *)Test_Sampling_Time_M, 0,
                sizeof(RT_MODEL_Test_Sampling_Time_T));

  /* block I/O */
  (void) memset(((void *) &Test_Sampling_Time_B), 0,
                sizeof(B_Test_Sampling_Time_T));

  /* states (dwork) */
  (void) memset((void *)&Test_Sampling_Time_DW, 0,
                sizeof(DW_Test_Sampling_Time_T));

  /* Start for S-Function (c280xadc): '<Root>/Current_Meassurement' */
  if (MW_adcInitFlag == 0) {
    InitAdc();
    MW_adcInitFlag = 1;
  }

  config_ADC_A (0U, 0U, 0U, 0U, 0U);

  /* Start for S-Function (c280xgpio_do): '<Root>/GPIO 02' */
  EALLOW;
  GpioCtrlRegs.GPAMUX1.all &= 0xFFFFFFCF;
  GpioCtrlRegs.GPADIR.all |= 0x4;
  EDIS;

  /* Start for DiscretePulseGenerator: '<Root>/Pulse Generator1' */
  Test_Sampling_Time_DW.clockTickCounter = 0L;

  /* Start for S-Function (c280xgpio_do): '<Root>/LED 1' */
  EALLOW;
  GpioCtrlRegs.GPAMUX2.all &= 0x3FFFFFFF;
  GpioCtrlRegs.GPADIR.all |= 0x80000000;
  EDIS;

  /* Start for S-Function (c280xgpio_do): '<Root>/LED2' */
  EALLOW;
  GpioCtrlRegs.GPBMUX1.all &= 0xFFFFFFCF;
  GpioCtrlRegs.GPBDIR.all |= 0x4;
  EDIS;
}

/* Model terminate function */
void Test_Sampling_Time_terminate(void)
{
  /* (no terminate code required) */
}

/*
 * File trailer for generated code.
 *
 * [EOF]
 */

采样时间为1us的非工作代码：

/*
 *
 * File: Test_Sampling_Time.c
 *
 * Code generated for Simulink model 'Test_Sampling_Time'.
 *
 * Model version                  : 1.2
 * Simulink Coder version         : 9.5 (R2021a) 14-Nov-2020
 * C/C++ source code generated on : Fri Apr 29 11:12:24 2022
 *
 * Target selection: ert.tlc
 * Embedded hardware selection: Texas Instruments->C2000
 * Code generation objectives: Unspecified
 * Validation result: Not run
 */

#include "Test_Sampling_Time.h"
#include "Test_Sampling_Time_private.h"

/* Block signals (default storage) */
B_Test_Sampling_Time_T Test_Sampling_Time_B;

/* Block states (default storage) */
DW_Test_Sampling_Time_T Test_Sampling_Time_DW;

/* Real-time model */
static RT_MODEL_Test_Sampling_Time_T Test_Sampling_Time_M_;
RT_MODEL_Test_Sampling_Time_T *const Test_Sampling_Time_M =
  &Test_Sampling_Time_M_;
static void rate_monotonic_scheduler(void);
uint16_T MW_adcInitFlag = 0;

/*
 * Set which subrates need to run this base step (base rate always runs).
 * This function must be called prior to calling the model step function
 * in order to "remember" which rates need to run this base step.  The
 * buffering of events allows for overlapping preemption.
 */
void Test_Sampling_Time_SetEventsForThisBaseStep(boolean_T *eventFlags)
{
  /* Task runs when its counter is zero, computed via rtmStepTask macro */
  eventFlags[1] = ((boolean_T)rtmStepTask(Test_Sampling_Time_M, 1));
}

/*
 *   This function updates active task flag for each subrate
 * and rate transition flags for tasks that exchange data.
 * The function assumes rate-monotonic multitasking scheduler.
 * The function must be called at model base rate so that
 * the generated code self-manages all its subrates and rate
 * transition flags.
 */
static void rate_monotonic_scheduler(void)
{
  /* Compute which subrates run during the next base time step.  Subrates
   * are an integer multiple of the base rate counter.  Therefore, the subtask
   * counter is reset when it reaches its limit (zero means run).
   */
  (Test_Sampling_Time_M->Timing.TaskCounters.TID[1])++;
  if ((Test_Sampling_Time_M->Timing.TaskCounters.TID[1]) > 999999) {/* Sample time: [1.0s, 0.0s] */
    Test_Sampling_Time_M->Timing.TaskCounters.TID[1] = 0;
  }
}

/* Model step function for TID0 */
void Test_Sampling_Time_step0(void)    /* Sample time: [1.0E-6s, 0.0s] */
{
  {                                    /* Sample time: [1.0E-6s, 0.0s] */
    rate_monotonic_scheduler();
  }

  /* S-Function (c280xadc): '<Root>/Current_Meassurement' */
  {
    AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1;  /* Reset SEQ1 module*/
    AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;/*clear INT sequencer*/
    AdcRegs.ADCTRL2.bit.SOC_SEQ1 = 1;  /* Software Trigger*/
    while (AdcRegs.ADCST.bit.INT_SEQ1 == 0) {
    }                                  /*Wait for Sequencer INT bit to clear */

    asm(" RPT #11 || NOP");
    Test_Sampling_Time_B.Current_Meassurement = (AdcRegs.ADCRESULT0) >> 4;
  }

  /* Switch: '<Root>/Switch' incorporates:
   *  Constant: '<Root>/Constant2'
   *  Gain: '<Root>/Gain'
   *  Gain: '<Root>/Gain1'
   *  Sum: '<Root>/Sum'
   */
  if (Test_Sampling_Time_P.Gain1_Gain *
      Test_Sampling_Time_B.Current_Meassurement * Test_Sampling_Time_P.Gain_Gain
      - Test_Sampling_Time_P.Constant2_Value >
      Test_Sampling_Time_P.Switch_Threshold) {
    /* Switch: '<Root>/Switch' incorporates:
     *  Constant: '<Root>/Constant'
     */
    Test_Sampling_Time_B.Switch = Test_Sampling_Time_P.Constant_Value;
  } else {
    /* Switch: '<Root>/Switch' incorporates:
     *  Constant: '<Root>/Constant1'
     */
    Test_Sampling_Time_B.Switch = Test_Sampling_Time_P.Constant1_Value;
  }

  /* End of Switch: '<Root>/Switch' */

  /* S-Function (c280xgpio_do): '<Root>/GPIO 02' */
  {
    if (Test_Sampling_Time_B.Switch)
      GpioDataRegs.GPASET.bit.GPIO2 = 1;
    else
      GpioDataRegs.GPACLEAR.bit.GPIO2 = 1;
  }
}

/* Model step function for TID1 */
void Test_Sampling_Time_step1(void)    /* Sample time: [1.0s, 0.0s] */
{
  /* DiscretePulseGenerator: '<Root>/Pulse Generator1' */
  Test_Sampling_Time_B.PulseGenerator1 = (Test_Sampling_Time_DW.clockTickCounter
    < Test_Sampling_Time_P.PulseGenerator1_Duty) &&
    (Test_Sampling_Time_DW.clockTickCounter >= 0L) ?
    Test_Sampling_Time_P.PulseGenerator1_Amp : 0.0;

  /* DiscretePulseGenerator: '<Root>/Pulse Generator1' */
  if (Test_Sampling_Time_DW.clockTickCounter >=
      Test_Sampling_Time_P.PulseGenerator1_Period - 1.0) {
    Test_Sampling_Time_DW.clockTickCounter = 0L;
  } else {
    Test_Sampling_Time_DW.clockTickCounter++;
  }

  /* S-Function (c280xgpio_do): '<Root>/LED 1' */
  {
    if (Test_Sampling_Time_B.PulseGenerator1)
      GpioDataRegs.GPASET.bit.GPIO31 = 1;
    else
      GpioDataRegs.GPACLEAR.bit.GPIO31 = 1;
  }

  /* Logic: '<Root>/NOT' */
  Test_Sampling_Time_B.NOT = !(Test_Sampling_Time_B.PulseGenerator1 != 0.0);

  /* S-Function (c280xgpio_do): '<Root>/LED2' */
  {
    if (Test_Sampling_Time_B.NOT)
      GpioDataRegs.GPBSET.bit.GPIO34 = 1;
    else
      GpioDataRegs.GPBCLEAR.bit.GPIO34 = 1;
  }
}

/* Model initialize function */
void Test_Sampling_Time_initialize(void)
{
  /* Registration code */

  /* initialize real-time model */
  (void) memset((void *)Test_Sampling_Time_M, 0,
                sizeof(RT_MODEL_Test_Sampling_Time_T));

  /* block I/O */
  (void) memset(((void *) &Test_Sampling_Time_B), 0,
                sizeof(B_Test_Sampling_Time_T));

  /* states (dwork) */
  (void) memset((void *)&Test_Sampling_Time_DW, 0,
                sizeof(DW_Test_Sampling_Time_T));

  /* Start for S-Function (c280xadc): '<Root>/Current_Meassurement' */
  if (MW_adcInitFlag == 0) {
    InitAdc();
    MW_adcInitFlag = 1;
  }

  config_ADC_A (0U, 0U, 0U, 0U, 0U);

  /* Start for S-Function (c280xgpio_do): '<Root>/GPIO 02' */
  EALLOW;
  GpioCtrlRegs.GPAMUX1.all &= 0xFFFFFFCF;
  GpioCtrlRegs.GPADIR.all |= 0x4;
  EDIS;

  /* Start for DiscretePulseGenerator: '<Root>/Pulse Generator1' */
  Test_Sampling_Time_DW.clockTickCounter = 0L;

  /* Start for S-Function (c280xgpio_do): '<Root>/LED 1' */
  EALLOW;
  GpioCtrlRegs.GPAMUX2.all &= 0x3FFFFFFF;
  GpioCtrlRegs.GPADIR.all |= 0x80000000;
  EDIS;

  /* Start for S-Function (c280xgpio_do): '<Root>/LED2' */
  EALLOW;
  GpioCtrlRegs.GPBMUX1.all &= 0xFFFFFFCF;
  GpioCtrlRegs.GPBDIR.all |= 0x4;
  EDIS;
}

/* Model terminate function */
void Test_Sampling_Time_terminate(void)
{
  /* (no terminate code required) */
}

/*
 * File trailer for generated code.
 *
 * [EOF]
 */

感谢您发布此信息，函数RATE_MONOTONIC_scheduler中的某些内容对我没有意义，在2us版本中，循环计数器为50万。而对于1us，计数器为100万。  我认为，1我们应该是2我们的一半，而不是两倍。  这两个数字都大于16位，所以我认为不存在铸造问题。

我会看看MW团队是否可以提供一些见解，了解计时器功能到底在发生什么，以及它最终如何调用ADC SOC。

最佳，

Matthew

你好，Jonathan：

您能否分享模型以帮助我们重现问题？

此致，

Ram Alla | MathWorks

e2e.ti.com/.../Test_5F00_Sampling_5F00_Time.zip

尊敬的RAM：感谢您的回复。

感谢您的回复，我是Jonathan发布此问题的客户。 我已将模型附加到此信息。

此致，

Marius