RT-Thread-开机时出现SPI初始化错误是怎么回事？RT-Thread问答社区

10 开机时出现SPI初始化错误是怎么回事？

发布于 2024-11-06 15:09:17 浏览：12 订阅该版

刚开始初始化了三个通道的adc模拟输入，第一个初始化的时候出现期望的值和读到的值不同，但是第二个第三个没问题，下面是具体代码和报错信息

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20241106/b7a57b2292f64278db77a18a74c5034b.png)

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20241106/e45373c1fa83df9d8d8e360865980775.png)

初始化实现代码
```c
 int ads114s08_spi_device_init(struct rt_spi_device **spi_chip, const char *spi_name, const char *dev_name,GPIO_TypeDef *cs_gpiox, uint16_t cs_gpio_pin)
 {
     ads114s08_device_t dev;
     rt_err_t res;
     dev = rt_calloc(1, sizeof(struct ads114s08_device));
     if (dev == RT_NULL)
     {
         LOG_E("Can't allocate memory for ads114s08 device on '%s' ", dev_name);
         rt_free(dev);
         return RT_NULL;
     }

res = rt_hw_spi_device_attach(spi_name, dev_name, cs_gpiox, cs_gpio_pin);
     if (res != RT_EOK)
     {
         LOG_E("ads114s08 failed to attach device %s\n", dev_name);
         return res;
     }

*spi_chip = (struct rt_spi_device *)rt_device_find(dev_name);
     if (!*spi_chip)
     {
         LOG_E("spi find run failed! cant't find %s device!\n", dev_name);
         return RT_NULL;
     }

dev->spi = *spi_chip;
     //Set device SPI Mode
     (*spi_chip)->bus->owner = *spi_chip;
     struct rt_spi_configuration cfg;

cfg.data_width = 8;
     cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_1 | RT_SPI_MSB;
     cfg.max_hz = 1 * 1000 * 1000; /* 1M */
     rt_spi_configure(dev->spi, &cfg);

if (ads114s08_chip_init(dev) != RT_EOK)
     {
         LOG_E("chip init error");
         rt_free(dev);
         return RT_NULL;
     }

return res;
 }
 
  static rt_err_t ads114s08_chip_init (ads114s08_device_t dev)
 {
     bool status;

status = adcStartupRoutine( dev->spi );

if (status == false)
     {
         LOG_E("ads114s08 chip init error");
         return RT_ERROR;
     }

writeSingleRegister(dev->spi, REG_ADDR_GPIOCON, 0x0F); //Config gpio to output

sendSTART( dev->spi );

return  RT_EOK;
 }
 
 在 writeSingleRegister函数中，把registerMap[i]的值赋给initRegisterMap[i]
 但在readMultipleRegisters函数里，读取到的registerMap[i]发生了改变
     writeSingleRegister( dev, REG_ADDR_STATUS, 0x00 );    // Reset POR event

// Create temporary array based on desired configuration
    for( i = 0 ; i < NUM_REGISTERS ; i++) {
        initRegisterMap[i] = registerMap[i];
    }

// Read back all registers, except for status register.
    readMultipleRegisters( dev, REG_ADDR_ID, NUM_REGISTERS );
    for ( i = REG_ADDR_STATUS; i < REG_ADDR_SYS - REG_ADDR_STATUS + 1; i++ ) {
        if ( i == REG_ADDR_STATUS )
            continue;
        if ( initRegisterMap[i] != registerMap[i] )
            return( false );
    }
    return( true );
	
	下面是 readMultipleRegisters具体的实现
	void readMultipleRegisters( struct rt_spi_device *dev, uint8_t startAddress, uint8_t count )
{
    rt_err_t ret = 0;

uint8_t DataTx[COMMAND_LENGTH + NUM_REGISTERS] = { 0 };
    uint8_t DataRx[COMMAND_LENGTH + NUM_REGISTERS] = { 0 };
    uint8_t i;

/* Check that the register address and count are in range */
    assert( startAddress + count <= NUM_REGISTERS );

// Read register data bytes
    DataTx[0] = OPCODE_RREG | (startAddress & OPCODE_RWREG_MASK);
    DataTx[1] = count - 1;

//    spiSendReceiveArrays( dev, DataTx, DataRx, COMMAND_LENGTH + count); //TODO_ADS
    ret = rt_spi_transfer(dev, DataTx, DataRx, COMMAND_LENGTH + count);
    if (ret == 0)
    {
        LOG_E("ads114S08 rt_spi_transfer failed!\r\n");
    }

for ( i = 0; i < count; i++ ) {
        // Store received register data into internal registerMap copy
        registerMap[i+startAddress] = DataRx[COMMAND_LENGTH + i];
    }
}

主要不理解为什么只有第一个通道的初始化报错，到底为什么读到的值发生了改变，希望有大佬能帮忙解答一下疑惑
```