从Nrf24寄存器读取STM32核返回错误结果

问题描述

我正在用Keil对Stm32F303K8 Nucleo板进行编程，我尝试配置Nrf24模块（在aliexpress上购买）。但是，它似乎只返回部分正确的数据。当我将0x01写入配置寄存器（0x20）时，它将返回0x0E（状态寄存器）和0x00，这是正确的。但是，当我尝试在以后读取数据时，得到0x0E（状态正确）和0x00（错误）。它应该返回0x01。也许有人看到我在做什么错了？

#include "stm32f3xx.h"

uint8_t spi_read_write(uint8_t address_byte);

void init_spi() {
    RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
    RCC->APB2ENR |= RCC_APB2ENR_SPI1EN_Msk;

    GPIOA->MODER |= GPIO_MODER_MODER0_0; // CSN as output
    GPIOA->MODER |= GPIO_MODER_MODER1_0; // CE as output
    GPIOA->MODER |= GPIO_MODER_MODER5_1; // SCK as alternate function
    GPIOA->MODER |= GPIO_MODER_MODER6_1; // MISO as alternate function
    GPIOA->MODER |= GPIO_MODER_MODER7_1; // MOSI as alternate function
    
    GPIOA->AFR[0] |= (0x5 << GPIO_AFRL_AFRL5_Pos); // SCK
    GPIOA->AFR[0] |= (0x5 << GPIO_AFRL_AFRL6_Pos); // MISO
    GPIOA->AFR[0] |= (0x5 << GPIO_AFRL_AFRL7_Pos); // MOSI
    
    SPI1->CR1 = 0;
    SPI1->CR2 = 0;
    
    SPI1->CR1 |= SPI_CR1_MSTR_Msk; // set as master
    SPI1->CR1 |= SPI_CR1_SSM_Msk; // SSM on
    SPI1->CR1 |= SPI_CR1_SSI_Msk; // SSI
    SPI1->CR1 |= SPI_CR1_BR; // baud rate 72MHz/256

    SPI1->CR1 |= SPI_CR1_SPE; // spi enable
}

uint8_t spi_read_write(uint8_t data_byte) {
    SPI1->DR = data_byte;
    while((SPI1->SR & SPI_SR_TXE) != SPI_SR_TXE);
    while((SPI1->SR & SPI_SR_RXNE) != SPI_SR_RXNE);
    while((SPI1->SR & SPI_SR_BSY) == SPI_SR_BSY);
    return SPI1->DR;
}

int main() {    
    init_spi();

    while(1) {
        uint8_t test = 0;
        
        GPIOA->BSRR |= GPIO_BSRR_BR_1; // ce = low
        GPIOA->BSRR |= GPIO_BSRR_BS_0; // csn = high
    
        // here I write to the register 0
        GPIOA->BSRR |= GPIO_BSRR_BR_0; // csn = low
        test = spi_read_write(0x20); // returns 0x0E as expected
        test = spi_read_write(0x01); // returns 0x00 as expected
        GPIOA->BSRR |= GPIO_BSRR_BS_0; // csn = high
        
        // here I read from the register 0
        GPIOA->BSRR |= GPIO_BSRR_BR_0; // csn = low
        test = spi_read_write(0x00); // returns 0x0E as expected
        test = spi_read_write(0x00); // returns 0x00,but why? It should be 0x01
        GPIOA->BSRR |= GPIO_BSRR_BS_0; // csn = high
     }
}

Nrf24 Datasheet

解决方法

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