求助：GP22用于激光测距，GP22无法给出中断信号

只看该作者 · 2019-12-22 09:59

本人用GD32与GP22组成激光测距系统。程序是按照例程AN032写的，但始终测不到GP22上的中断引脚给出中断信号（矫正高速时钟时的中断无法检测到，后面也一样），将GD32中中断检测语句屏蔽，发现可以通过通信检测将GP22中的寄存器1中的配置读回，说明通信正常，配置语句也正常。我将start引脚悬空，stop1，stop2引脚接通过FPGA发出的脉冲（模拟激光器给GP22的脉冲），其中stop1超前stop2时间1us，脉宽10us，周期1s。发现stop1，stop2引脚接不接信号，读回的结果寄存器的值都一样，不发生改变，读回随机的数，也不变。例程如下，配置与其相同。例程中D8引脚注释开启激光器，我不需要，所以屏了。问题：start引脚必须要给信号吗？有的说在配置中给start开启噪声单元就不用给start信号，我开启了。
void main(void)
{
  ENTR_CRT_SECTION();
  /* Setup STM32 system (clock, PLL and Flash configuration) */
  SystemInit();

  EXT_CRT_SECTION();

  // Choose your Slot (SPI1, SPI2)
  void* Bus_Type = SPI1;

  /* controlled loop */
  while (Dummy_var!=11) // To control the loop, e.g. (Dummy_var!=7)
  {
if (Dummy_var==10) Dummy_var=0; // Infinite loop

if(configured_true==FALSE)
{
   configured_true = TRUE;
   SPIx_GPIOs_Init(Bus_Type);
   SPIx_Interface_Init(Bus_Type);

   Ext_Interrupt_Init();

   gp22_send_1byte(Bus_Type, Power_On_Reset);
   Dly100us((void*)5);             // 500 us wait for GP22

   // Writing to the configuration registers (CR)
   // CR0: DIV_CLKHS = 2, START_CLKHS = 1, CALIBRATE = 0, NO_CAL_AUTO = 1, MESSB2 = 0, NEG_STOP = NEGSTART = 0, ...
   gp22_wr_config_reg(Bus_Type, 0x80, 0x00241000);
   // CR1: EN_FAST_INIT = 1, HITIN2 = 1, HITIN1 = 1, ...
   gp22_wr_config_reg(Bus_Type, 0x81, 0x19C90000);
   // CR2: EN_INT = b111, RFEDGE1 = RFEDGE2 = 0, ...
   gp22_wr_config_reg(Bus_Type, 0x82, 0xE0000000);
   // CR3: ...
   gp22_wr_config_reg(Bus_Type, 0x83, 0x00000000);
   // CR4: ...
   gp22_wr_config_reg(Bus_Type, 0x84, 0x20000000);
   // CR5: CON_FIRE = b000, EN_STARTNOISE = 1, ...
   gp22_wr_config_reg(Bus_Type, 0x85, 0x10000000);
   // CR6: QUAD_RES = 0, ...
   gp22_wr_config_reg(Bus_Type, 0x86, 0x00000000);
}

// .........................................................................
// ........................Calibrate High Speed Clock.......................
// ...................Laser Rangefinder Measurement CYCLE...................
// .........................Caluculate Result Values........................

N_Measure_Cycles = 50000;

diff_Cal2_Cal1_old = diff_Cal2_Cal1_new;

if((Dummy_var==0) | (Dummy_var==10))
{
//--------------------------------------------------------------------------
// Start Calibrate High Speed Clock Cycle
gp22_send_1byte(Bus_Type, Init);
gp22_send_1byte(Bus_Type, Start_Cal_Resonator);

// Wait for INT Slot_x
if (Bus_Type==SPI1) while (GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_4)==1);
if (Bus_Type==SPI2) while (GPIO_ReadInputDataBit(GPIOE, GPIO_Pin_11)==1);

//Calculate Correction factor
//The time interval to be measured is set by ANZ_PER_CALRES
//which defines the number of periods of the 32.768 kHz clock:
//2 periods = 61.03515625 祍
CLKHS_freq_corr_fact = 61.03515625/
   gp22_read_n_bytes(Bus_Type, 4, 0xB0, 0x00, 16) * CLKHS_freq;

printf("\n Correction factor for clock = %1.4f\n", CLKHS_freq_corr_fact);

CLKHS_freq_cal = CLKHS_freq * CLKHS_freq_corr_fact; // Calibrated Clock frequency
}

//--------------------------------------------------------------------------
// Start Seperate Calibration Measurement Cycle
gp22_send_1byte(Bus_Type, Init);

gp22_send_1byte(Bus_Type, Start_Cal_TDC); // update calibration data

// Note:
// The calibration data are not addressed directly after the calibration
// measurement but after the next regular measurement, before the next INIT.

// Wait for INT Slot_x
if (Bus_Type==SPI1) while (GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_4)==1);
if (Bus_Type==SPI2) while (GPIO_ReadInputDataBit(GPIOE, GPIO_Pin_11)==1);

gp22_wr_config_reg(Bus_Type, 0x81, 0x19490000);

//--------------------------------------------------------------------------
// 1st ToF Measurement plus calibratio data readout
gp22_send_1byte(Bus_Type, Init);

//Trigger pulse laser
// SetPortHigh;
GPIO_WriteBit(GPIOD, GPIO_Pin_8, Bit_SET); // Output HIGH
// SetPortLow;
GPIO_WriteBit(GPIOD, GPIO_Pin_8, Bit_RESET); // Output LOW

// Wait for INT Slot_x
if (Bus_Type==SPI1) while (GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_4)==1);
if (Bus_Type==SPI2) while (GPIO_ReadInputDataBit(GPIOE, GPIO_Pin_11)==1);

// First regular measurement (to readout calibration data)
RAW_Result = gp22_read_n_bytes(Bus_Type,4,0xB0,0x00,16);
// printf("\n 1. Measured RAW Value = %.0f \n",RAW_Result); // RAW value

// Check Status Register, next free result register
// printf("Stat_Reg = 0x%04X \n",gp22_read_status_bytes(Bus_Type));

// readout the new calibration data from result register adr 0x01
gp22_wr_config_reg(Bus_Type, 0x81, 0x67490000);
diff_Cal2_Cal1_new = gp22_read_n_bytes(Bus_Type,4,0xB0,0x01,16);

//--------------------------------------------------------------------------
// Caluculate the real time after the hole first cycle loop
while (diff_Cal2_Cal1_old != 0)
{
      avg_diff_Cal2_Cal1 = (diff_Cal2_Cal1_new+diff_Cal2_Cal1_old) / 2;

//       printf("\n OLD Cal2-Cal1 RAW Value = %.0f \n",diff_Cal2_Cal1_old);
//       printf("\n NEW Cal2-Cal1 RAW Value = %.0f \n",diff_Cal2_Cal1_new);

      average_RAW_Result /= N_Measure_Cycles;

      // Used Formulas:
      // ---------------------------------------------------
      //                T_ref
      // Time_Value = ----------- * measured_RAW_Value
      //             Cal2-Cal1
      // ---------------------------------------------------
      //                velocity_of_light
      // Distance_Value = ------------------- * Time_Value
      //                         2
      // ---------------------------------------------------

      // For this Source Code would be a Reference Clock used with 1 MHz

      Time_Result = (average_RAW_Result/avg_diff_Cal2_Cal1) * 1000;//time [ns]

      Distance_Result = Time_Result / 6.671281904; //distance [m]

      printf("\n Time Measure Result (ToF) = %.3f ns\n",Time_Result);
      printf(" corresponds to %.3f m of Distance\n",Distance_Result);
      printf(" to reflected point after %u Measurements\n",N_Measure_Cycles);

      diff_Cal2_Cal1_old = 0;
}

//--------------------------------------------------------------------------
// if more than one measure cycle
average_RAW_Result = RAW_Result; // set first value of average_RAW_Result

gp22_wr_config_reg(Bus_Type, 0x81, 0x19C90000); // EN_FAST_INIT = 1
gp22_send_1byte(Bus_Type, Init);

//Trigger pulse laser
// SetPortHigh;
GPIO_WriteBit(GPIOD, GPIO_Pin_8, Bit_SET); // Output HIGH
// SetPortLow;
GPIO_WriteBit(GPIOD, GPIO_Pin_8, Bit_RESET); // Output LOW

//--------------------------------------------------------------------------
// n'th ToF Measurement
for (int i=2; i<=N_Measure_Cycles;i++)
{
      // Wait for INT Slot_x
      if (Bus_Type==SPI1) while (GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_4)==1);
      if (Bus_Type==SPI2) while (GPIO_ReadInputDataBit(GPIOE, GPIO_Pin_11)==1);

      RAW_Result = gp22_read_n_bytes(Bus_Type,4,0xB0,0x00,16);
//       printf(" %u. Measure RAW Value = %.0f \n",i,RAW_Result); // RAW value
      average_RAW_Result += RAW_Result;

      //Trigger pulse laser
      // SetPortHigh;
      GPIO_WriteBit(GPIOD, GPIO_Pin_8, Bit_SET); // Output HIGH
      // SetPortLow;
      GPIO_WriteBit(GPIOD, GPIO_Pin_8, Bit_RESET); // Output LOW
}

//--------------------------------------------------------------------------

printf("\nNEW CYCLE...\n");

Dummy_var++; // To Control the loop

  } // End while Dummy_var

} //End main