为什么没有SPI spidrv通信的CLOCK信号

问题描述

您好，我为efm32LG编写了以下代码，并在执行SPI发送命令时尝试跟踪CLK信号。我使用了LOCATION0，如下面的数据表所示，放了我的示波器，当我通过了我的发送命令时，我根本没有捕捉到任何时钟信号。为什么会发生呢？谢谢。

@H_404_4@

#include "em_device.h"
#include "em_cmu.h"
#include "em_gpio.h"
#include "spidrv.h"
#include "dmadrv.h"
#include "em_usart.h"
#include "em_chip.h"
#include <stdint.h>
#include <stdbool.h>
#include "em_emu.h"

#include "bsp.h"
#include "bsp_trace.h"
#define LED_PORT_E    gpioPortE
#define LED_PIN_E     15

#define LED_PORT_A    gpioPortA
#define LED_PIN_A     15

#define USER_LOCATION 5

#define BUFFER_SIZE 1
char buffer[BUFFER_SIZE];

volatile uint32_t msTicks; /* counts 1ms timeTicks */

void Delay(uint32_t dlyTicks);
void SysTick_Handler(void)
{
  msTicks++;       /* increment counter necessary in Delay()*/
}
void Delay(uint32_t dlyTicks)
{
  uint32_t curTicks;

  curTicks = msTicks;
  while ((msTicks - curTicks) < dlyTicks) ;
}
int main(void)
{

//    uint8_t *pt;
  int i,j;
   i=0;
        //start write update command
        uint8_t B7_B0=0b11110000; //first 4 are dont care,first 4 bits data
         uint8_t B15_B8=0b11111111;//data bits
         uint8_t B23_B16=0b00000111;//channel A DATA total 0000 1111 1111 1111 last bin1
         uint8_t B31_B24=0b00000011;//write to buffer and update DAC,Write /rest dont care
         //start end update command


         uint8_t  Recieved_D[4];
         Recieved_D[0]=0b11111111;
         Recieved_D[1]=0b11111111;
         Recieved_D[2]=0b11111111;
         Recieved_D[3]=0b11111111;
        //Enable SDO register
         uint8_t C31_C24=0b00001000; //enable DSO command
         uint8_t C23_C16=0b00000000;
         uint8_t C15_C8=0b00000000;
         uint8_t C7_C0=0b00000010;// enable DSO bit

         //NO OPeration COMMAND
     //    uint8_t D31_D24=0b00001110;
     //    uint8_t D23_D16=0b00000000;
     //    uint8_t D15_D8=0b00000000;
     //    uint8_t D7_D0=0b00000000;


          //start read command 0000
                 uint8_t E7_E0=0b11110000; //first 4 are dont care,first 4 bits data
                  uint8_t E15_E8=0b11111111;//data bits
                  uint8_t E23_E16=0b00000000;//channel A rest is dont care
                  uint8_t E31_E24=0b00010000;//read
                  //start end update command

                  //NO OPeration COMMAND
                           uint8_t F31_F24=0b00001110;
                           uint8_t F23_F16=0b00000000;
                           uint8_t F15_F8=0b00000000;
                           uint8_t F7_F0=0b00000000;
  // Chip errata
  CHIP_Init();

  // Enable oscillator to GPIO and USART1 modules
  CMU_ClockEnable(cmuClock_GPIO,true);
  CMU_ClockEnable(cmuClock_USART1,true);
  CMU_ClockEnable(cmuClock_USART0,true);





//  BSP_TraceProfilerSetup();

    /* Setup SysTick Timer for 1 msec interrupts  */
    if (SysTick_Config(CMU_ClockFreqGet(cmuClock_CORE) / 1000)) {
      while (1) ;
    }

    /* Initialize LED driver */

  //  BSP_LedsInit();
  //  BSP_LedSet(0);
  // set pin modes for UART TX and RX pins
  GPIO_PinModeSet(gpioPortC,1,gpioModeInput,0);
  GPIO_PinModeSet(gpioPortC,gpioModePushPull,1);
  ///////////////////////////////////
    USART_InitAsync_TypeDef init = USART_INITASYNC_DEFAULT;
    USART_InitAsync(USART1,&init);
    //defining location 5 so PORT C will be tx an rx for async uart
    USART1->ROUTE |= USART_ROUTE_TXPEN | USART_ROUTE_RXPEN|USART_ROUTE_LOCATION_LOC0;
   // GPIO_PinModeSet(LED_PORT_A,15,1);

      GPIO_PinModeSet(LED_PORT_E,1);

    GPIO_PinModeSet(LED_PORT_A,2,1);
    SPIDRV_HandleData_t handleData;
      SPIDRV_Handle_t handle = &handleData;
      SPIDRV_Init_t initData =  SPIDRV_MASTER_USART0;
      initData.csControl=spidrvCsControlApplication; //manual CS
      initData.bitOrder=1; //MSB first send bit order
      initData.portLocation = USART_ROUTE_LOCATION_LOC0; //defining location 0 for sync uart
      SPIDRV_Init(handle,&initData);

      GPIO_PinOutClear(LED_PORT_A,2); //chip select low starts transmition
      SPIDRV_MTransmitB(handle,&B31_B24,1);
      SPIDRV_MTransmitB(handle,&B23_B16,&B15_B8,&B7_B0,1);
      GPIO_PinOutSet(LED_PORT_A,2); // chip select high,end transmition
       Delay(1000);
//////////////////
      GPIO_PinOutClear(LED_PORT_A,&C31_C24,1);
            SPIDRV_MTransmitB(handle,&C23_C16,&C15_C8,&C7_C0,1);
        GPIO_PinOutSet(LED_PORT_A,end transmition
      Delay(1000);
      //////////////
      GPIO_PinOutClear(LED_PORT_A,2); //chip select low starts transmition
                     SPIDRV_MTransmitB(handle,&E31_E24,1);
                    SPIDRV_MTransmitB(handle,&E23_E16,&E15_E8,&E7_E0,1);
              //////////////
  GPIO_PinOutSet(LED_PORT_A,end transmition
  Delay(1000);
  GPIO_PinOutClear(LED_PORT_A,2); //chip select low starts transmition
                SPIDRV_MTransmitB(handle,&F31_F24,1);
                                    SPIDRV_MTransmitB(handle,&F23_F16,&F15_F8,&F7_F0,end transmition

  // Initialize USART asynchronous mode and route pins






      GPIO_PinOutClear(LED_PORT_A,2);
       SPIDRV_MReceiveB(handle,&Recieved_D,4);
      GPIO_PinOutSet(LED_PORT_A,2);

      uint8_t * pt = (uint8_t*)(&Recieved_D);

      while (1)
     {

//E-green
//A-red

          Delay(1000);


             for (i = 0; i < 4 ; i ++ )
                 {
                // USART_Tx(USART1,*(&Recieved_D+i));
                 USART_Tx(USART1,*(pt++));
                 }
                 USART_Tx(USART1,'\n');
                 GPIO_PinOutClear(LED_PORT_E,15);
                 Delay(5000);
                 GPIO_PinOutSet(LED_PORT_E,15);
               Delay(5000);
      }//end while(1)
  }//end main

解决方法

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embedded spi