ESP32 Forum

Posted: **Fri Apr 19, 2019 7:32 am**

https://docs.espressif.com/projects/esp ... n_gen.html
我这边是按照上面的流程进行操作
要生成的test.csv

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key,type,encoding,value
namespace_name,namespace,,
key1,data,u8,1

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转.bin指令

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python ~/esp/esp-idf/components/nvs_flash/nvs_partition_generator/nvs_partition_gen.py --input test.csv --output test.bin --size 0x6000

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分区表也进行了修改

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# Espressif ESP32 Partition Table
#
# Note: if you change the phy_init or app partition offset
#       make sure to change the offset in Kconfig.projbuild
#
# Name,   Type, SubType, Offset,  Size, Flags
nvs,      data, nvs,     0x9000,  0x6000,
phy_init, data, phy,     0xf000,  0x1000,
factory,  app,  factory, 0x10000, 1200000,

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读取的函数

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#define TEST_STORAGE_NAMESPACE "namespace_name"    //nvs测试名字空间
uint8_t test_data = 0;
/******************************
* 函数名称：get_nvs_csv_data
* 作    者：Kyle
* 日    期：20190419
* 描    述：测试nvs
* 输入参数：无
* 返 回 值：无
******************************/
esp_err_t get_nvs_csv_data(void)
{
    esp_err_t ret = ESP_FAIL;
    esp_err_t err = ESP_FAIL;
    nvs_handle read_nvs_handle;
    size_t required_size = 1;
    ESP_LOGI(SPP_TAG, "required_size:%d\n",required_size);
 
    // Open
    ESP_ERROR_CHECK(nvs_open(TEST_STORAGE_NAMESPACE, NVS_READWRITE, &read_nvs_handle));
 
    // Read
    err = nvs_get_blob(read_nvs_handle, "key1", &test_data, &required_size);
    ESP_LOGI(SPP_TAG, "[ test data ]:%d\n",test_data);
    if(err == ESP_OK)
    {
        ESP_LOGI(SPP_TAG, "[ test data ]:%d\n",test_data);
        ret = ESP_OK;
    }
    else if(err == ESP_ERR_NVS_NOT_FOUND)
    {
        ESP_LOGI(SPP_TAG,"ESP_ERR_NVS_NOT_FOUND\n");
    }
 
    // Commit
    ESP_ERROR_CHECK(nvs_commit(read_nvs_handle));
 
    // Close
    nvs_close(read_nvs_handle);
 
    return ret;
}

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但是得到的日志出来是

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I (264) SPP_ACCEPTOR_DEMO: required_size:1
 
I (274) SPP_ACCEPTOR_DEMO: [ test data ]:0
 
I (274) SPP_ACCEPTOR_DEMO: ESP_ERR_NVS_NOT_FOUND

if the requested key doesn't exist，key值不存在，请问下我是哪一步出现问题呢？

Posted: **Sun May 05, 2019 7:51 am**

问题找到了，把read的函数换成nvs_get_u8就好了

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I (262) SPP_ACCEPTOR_DEMO: required_size:1

I (272) SPP_ACCEPTOR_DEMO: [ test data ]:1

I (272) SPP_ACCEPTOR_DEMO: [ test data ]:1

日志打印

ESP32 Forum

使用NVS Partition Generator Utility nvs读取不到key值

使用NVS Partition Generator Utility nvs读取不到key值

Re: 使用NVS Partition Generator Utility nvs读取不到key值