MSP430G2553 从 MCP3464 ADC 转换器 (SPI) 接收错误值

Question

我已将 MCP3464 焊接在 PCB 断板上，并将其与 MSP430G2553 连接。然后我编写了一个测试代码，看看是否可以对 MCP3464 的内部寄存器进行读写。但是当我尝试从中读取时，我每次都会得到错误的值。

这是我尝试过的：

将新的 MCP3464 焊接到新的断线板上
尝试找到 MCP430G2553 的示例代码

数据表 ADC 转换器 MCP3464

微控制器 MSP430G2553 数据表

家庭用户指南 MSP430G2553

在此示例代码中，我尝试写入定时器寄存器，然后从中读取以查看是否输出相同的值，这里我发送 0xA56547，但收到 0xF7E7C0。

这是代码：

#include <msp430.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>

#include "MCP3464_Commands.h"           // library with command's for the MCP3464

uint8_t rcv;


void init_Clock(void);
void SPI_Send(uint8_t data);
void configSPI_A(void);


void main(void)
{
    P1DIR |= BIT3;          // BIT 3 is CS
    P1OUT |= BIT3;          // CS is HIGH

    init_Clock();           // clock configuration
    configSPI_A();          // SPI A configuration


while (1)
{



    P1OUT |= BIT3;                          // CS is HIGH
    P1OUT &= ~BIT3;                         // CS is LOW
    SPI_Send(0b111000);            // Here the MSP430 sends a full reset to the MCP3464

    P1OUT |= BIT3;                          // CS is HIGH


    P1OUT &= ~BIT3;                         // CS is LOW
    SPI_Send(0b10 + 0b100000);    // Here i want to write data to the TIMER register, this is a 24 bit register

    SPI_Send(0b10100101);                   // This is the 24 bit data that i send to the MCP3464
    SPI_Send(0b01100101);
    SPI_Send(0b01000111);

    P1OUT |= BIT3;                          //CS is HIGH



    P1OUT &= ~BIT3;                         // CS is LOW

    SPI_Send(0b11 + 0b100000);     // here i want to read form the time register

    SPI_Send(0);                            // since this is a 24 bit register i send nothing and just
    SPI_Send(0);                            // read form the UCA0RXBUF what the data is in debug mode
    SPI_Send(0);

    P1OUT |= BIT3;                          // CS is HIGH

    }
}


void SPI_Send(uint8_t data)
{

    UCA0TXBUF = data;                           // data to UCA0TXBUF register
    while(UCA0STAT & UCBUSY);                   // wait until the data has bean send

    rcv = UCA0RXBUF;                            // Received data from the UCA0RXBUF to rcv

}

void configSPI_A(void)
{
    P1SEL = BIT1 + BIT2 + BIT4;             // PIN 1 2 and 4 for spi protocol
    P1SEL2 = BIT1 + BIT2 + BIT4;            // PIN 1 2 and 4 for spi protocol 2


    UCA0CTL1 |= UCSWRST;                                           //enable, usci logic held in reset state
    UCA0CTL0 |= UCMSB + UCMST + UCSYNC + UCCKPH + UCCKPL;          // SPI Mode [1.1], most significant bit first, Syncronish, master mode,
    UCA0CTL1 |= UCSSEL_2 ;                                         // select SMCLK


    UCA0BR0 = 20;                             // the clock divider is set to 20 so that the spi clock can be 800 KHz
    UCA0BR1 = 0;

    UCA0CTL1 &= ~UCSWRST;
}


// set clock to max
void init_Clock(void)
{

    WDTCTL = WDTPW + WDTHOLD;   // hold watchdog
    BCSCTL2 = SELM_0 + DIVM_0 + DIVS_0;

    if (CALBC1_16MHZ != 0xFF)
    {
        __delay_cycles(100000);
        DCOCTL = 0x00;
        BCSCTL1 = CALBC1_16MHZ;
        DCOCTL = CALDCO_16MHZ;
    }

}

更新

这是我从示波器上截取的一些屏幕截图