EEPROM协议误解

Question

我目前使用的是michrochip的eeprom ( 24cw160 )，通过i2c连接到stm32f4 (11RET)。当我的逻辑分析器打印一些i2c消息(带有确认)时，配置和连接似乎正常工作，我可以发送数据和接收数据。在阅读了reference manual(特别是第13页和第18页，其中包含我正在进行的两个操作的原理图)之后，我期望下面的代码发送数据0，1，2……发送到x10之后的地址，然后接收回相同的数据并打印：

while(true){

    HAL_Delay(1000);
    std::array<uint8_t,100> arr{};
    int counter=0;
    for(auto&i :arr){
      i=counter;
      counter++;
    }
    auto ret1 = HAL_I2C_Mem_Write_DMA(&hi2c1 , 0xa0 , 0x10 , 1 ,arr.data() , arr.size());
    HAL_Delay(1000);
    std::array<uint8_t,100> arr2{};
    arr2.fill(1);
    auto ret2 = HAL_I2C_Mem_Read( &hi2c1 , 0xa1 , 0x10 , 1 , arr2.data() , arr2.size(),100);
    printf("arr2:\n");
    for(auto i:arr2){
      printf("%d,",(int)i);
    }
    printf("\nWrite ret status: %d\nRead ret status: %d\n",ret1,ret2);
  }

相反，我在我的终端上得到的是：

arr2:
70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
Write ret status: 0
Read ret status: 0
arr2:
68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
Write ret status: 0
Read ret status: 0

注意，打印的第一行和第二行有一些不同，第二行是重复的(所以虽然第一次打印的东西和其他的有点不同)，但老实说，我认为我把自己和我给HAL_I2C_Mem_Write和read的常量参数搞混了，我也想要一些解释。有关更多信息，请评论我，我将提供所有必要的诊断/初始化等。

Answer 1

多亏了这些评论，我成功地将一个字节发送到了我想要的任何地址。前面代码的一个值得注意的错误是MemAddress参数(HAL_I2C_Write_Mem的第三个参数)，因为我的eeprom是11位可寻址的，所以我应该向hal声明它是16而不是8，因为5个额外的位被忽略，但小于11可能会发生故障。

第二个问题是，我试图写入超过32个字节，并且我只读取前32个字节，因为协议不接受一次写入或读取超过一个32字节的页面。因此，以下是修改后的代码，其中包含对更改的一些注释：

std::array<uint8_t,32> arr{0}; //32 bytes instead of something silly
unsigned counter=0;
for(auto&i :arr){
    i=counter;
    counter++;
}
// 0x20 is a start of a page so it can write all 32 bits
// I2C_MEMADD_SIZE_16BIT is the value 2 instead of 1 I had
// The extra 5 bits are ignored
// For the testing I call the blocking write
auto ret1 = HAL_I2C_Mem_Write(&hi2c1 , 0xa0 , 0x20 , I2C_MEMADD_SIZE_16BIT , arr.data() , arr.size(),4);
HAL_Delay(4);
std::array<uint8_t,32> arr2{0};
arr2.fill(1);
auto ret2 = HAL_I2C_Mem_Read( &hi2c1 , 0xa1 , 0x20 , I2C_MEMADD_SIZE_16BIT , arr2.data() ,arr2.size(),4);
HAL_Delay(4);
printf("arr2: ");
for(auto i:arr2)
   printf(" %d,",(int)i);
printf("\nWrite ret status: %d\nRead ret status: %d\n",ret1,ret2);