为 SAMD51 启用功能配置 SPI 通信后冻结设置

Question

我目前正在 SAMD51 板中配置 SPI 通信。经过大量研究，我找到了如何设置寄存器以启动引脚配置和时钟设置等。但是在设置结束时有一个过程需要再次启用该引脚。

这是 MCU https://www.mouser.com/datasheet/2/268/60001507A-1130176.pdf 的数据表

SERCOM4->SPI.CTRLA.bit.ENABLE = 1;

在我调用这条线之后，图书馆冻结了，我无法得到任何其他回应。

在 cpp 文件下方找到。

#include "SercomSPISlave.h"

// Constructors //
SercomSPISlave::SercomSPISlave()
{
    
}

// Public Methods //
void SercomSPISlave::Sercom4init()
{

  //Setting up NVIC
  NVIC_EnableIRQ(SERCOM4_0_IRQn);
  NVIC_SetPriority(SERCOM4_0_IRQn,2);

  //MCLK->APBDMASK.reg |= MCLK_APBDMASK_SERCOM4;
  MCLK->APBDMASK.bit.SERCOM4_ = 1;

  //Setting Generic Clock Controller!!!!
  //GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID(GCM_SERCOM4_CORE) | //Generic Clock 0
  //          GCLK_CLKCTRL_GEN_GCLK0 | // Generic Clock Generator 0 is the source
  //          GCLK_CLKCTRL_CLKEN; // Enable Generic Clock Generator

  GCLK->PCHCTRL[34].reg = GCLK_PCHCTRL_GEN_GCLK0 | GCLK_PCHCTRL_CHEN; 

  //while(GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY); //Wait for synchronisation
  //Configure SERCOM4 SPI PINS  
    //Set PA12 as input (MOSI) - on D22 / MISO
    //Set PB09 as input (SCK) - on A2
    //Set PB10 as input (SS) - on D23 / MOSI
    //Set PB11 as output (MISO) - on D24 / SCK
    
  PORT->Group[PORTB].PINCFG[11].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM4 SPI PB11
  PORT->Group[PORTB].PMUX[11 >> 1].bit.PMUXO = 0x3; //SERCOM 4 is selected for peripheral use of this pad (0x3 selects peripheral function D: SERCOM-ALT)
  PORT->Group[PORTB].PINCFG[12].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM4 SPI PB12
  PORT->Group[PORTB].PMUX[12 >> 1].bit.PMUXE = 0x3; //SERCOM 4 is selected for peripheral use of this pad (0x3 selects peripheral function D: SERCOM-ALT)
  PORT->Group[PORTB].PINCFG[13].bit.PMUXEN = 0x1; //Enable Peripheral Multiplexing for SERCOM4 SPI PB13
  PORT->Group[PORTB].PMUX[13 >> 1].bit.PMUXO = 0x3; //SERCOM 4 is selected for peripheral use of this pad (0x3 selects peripheral function D: SERCOM-ALT)
  PORT->Group[PORTA].PINCFG[9].bit.PMUXEN = 0x1;  //Enable Peripheral Multiplexing for SERCOM4 SPI PB09
  PORT->Group[PORTA].PMUX[9 >> 1].bit.PMUXO = 0x3; //SERCOM 4 is selected for peripheral use of this pad (0x3 selects peripheral function D: SERCOM-ALT)

  /*
  Explanation:
  PMUXEN stands for Peripheral Multiplexing Enable
  PMUXE stands for Even bits in the Peripheral Multiplexing register
  PMUXO stands for Odd bits in the Peripheral Multiplexing register
  The selection of peripheral function A to H is done by writing to the Peripheral Multiplexing Odd and Even bits in the Peripheral Multiplexing register (PMUXn.PMUXE/O) in the PORT.
  Reference: Atmel-42181G-SAM-D21_Datasheet section 6.1 on page 21

  PA12 corresponds to: PORTA, PMUX[6] Even
  PB09 corresponds to: PORTB, PMUX[4] Odd
  PB10 corresponds to: PORTB, PMUX[5] Even
  PB11 corresponds to: PORTB, PMUX[5] Odd
  In general:
  Px(2n+0/1) corresponds to Portx, PMUX[n] Even=0/Odd=1*/


  //Disable SPI 1
  SERCOM4->SPI.CTRLA.bit.ENABLE =0;
  while(SERCOM4->SPI.SYNCBUSY.bit.ENABLE);
  
  //Reset SPI 1
  SERCOM4->SPI.CTRLA.bit.SWRST = 1;
  while(SERCOM4->SPI.CTRLA.bit.SWRST || SERCOM4->SPI.SYNCBUSY.bit.SWRST);
  
  
  //Set up SPI Control A Register
  SERCOM4->SPI.CTRLA.bit.DORD = 0; //MSB first
  SERCOM4->SPI.CTRLA.bit.CPOL = 0; //SCK is low when idle, leading edge is rising edge
  SERCOM4->SPI.CTRLA.bit.CPHA = 0; //data sampled on leading sck edge and changed on a trailing sck edge
  SERCOM4->SPI.CTRLA.bit.FORM = 0x0; //Frame format = SPI
  SERCOM4->SPI.CTRLA.bit.DIPO = 0x0; //DATA PAD0 MOSI is used as slave input (slave mode) // page 492
  SERCOM4->SPI.CTRLA.bit.DOPO = 0x2; //DATA PAD2 MISO is used as slave output
  SERCOM4->SPI.CTRLA.bit.MODE = 0x2; //SPI in Slave mode
  SERCOM4->SPI.CTRLA.bit.IBON = 0x1; //Buffer Overflow notification
  SERCOM4->SPI.CTRLA.bit.RUNSTDBY = 1; //wake on receiver complete
  
  
  //Set up SPI control B register
  //SERCOM4->SPI.CTRLB.bit.RXEN = 0x1; //Enable Receiver
  SERCOM4->SPI.CTRLB.bit.SSDE = 0x1; //Slave Selecte Detection Enabled
  SERCOM4->SPI.CTRLB.bit.CHSIZE = 0; //character size 8 Bit
  //SERCOM4->SPI.CTRLB.bit.PLOADEN = 0x1; //Enable Preload Data Register
  //while (SERCOM4->SPI.SYNCBUSY.bit.CTRLB);  

  
  //Set up SPI interrupts
  SERCOM4->SPI.INTENSET.bit.SSL = 0x1; //Enable Slave Select low interrupt        
  SERCOM4->SPI.INTENSET.bit.RXC = 0x1; //Receive complete interrupt
  SERCOM4->SPI.INTENSET.bit.TXC = 0x1; //Receive complete interrupt
  SERCOM4->SPI.INTENSET.bit.ERROR = 0x1; //Receive complete interrupt
  SERCOM4->SPI.INTENSET.bit.DRE = 0x1; //Data Register Empty interrupt

  
  //init SPI CLK  
  //SERCOM4->SPI.BAUD.reg = SERCOM_FREQ_REF / (2*4000000u)-1;
  //Enable SPI

  SERCOM4->SPI.CTRLB.bit.RXEN = 0x1; //Enable Receiver, this is done here due to errate issue
  while(SERCOM4->SPI.SYNCBUSY.bit.CTRLB); //wait until receiver is enabled

  Serial.begin(115200);



  SERCOM4->SPI.CTRLA.bit.ENABLE = 1;
  Serial.print(SERCOM4->SPI.CTRLA.bit.ENABLE);

  while(SERCOM4->SPI.SYNCBUSY.bit.ENABLE);

}

在 .h 文件下方找到。

#ifndef SercomSPISlave_h
#define SercomSPISlave_h

#include <Arduino.h>

class SercomSPISlave
{
    public:
    // Constructors //
    SercomSPISlave();
    // Public Methods //
    void Sercom4init();
};

#endif

在 .ino 代码下方找到

#include <SercomSPISlave.h>
SercomSPISlave SPISlave;


void setup()
{  
  Serial.begin(115200);
  Serial.println("Serial started");
  SPISlave.Sercom4init();
  while(!Serial);
  Serial.println("Sercom1 SPI slave initialized!");
}

void loop()
{

}

我感谢你能给我的任何支持。

Answer 1

谢谢你的问题。为了更好地理解 https://github.com/lenvm/SercomSPISlave 中的代码是如何工作的，我在 .h 和 .cpp 文件中添加了一些额外的代码命令。 cmets 包括对 ATSAMD21 数据表页码的引用，这些页码解释了每个注册表的含义。我认为这可能会帮助您找出 SAMD21 和 SAMD51 之间的区别。

以后，请记住在您的帖子中说明您包含的代码的来源。