Static variable (NVS handle) in a file getting overwritten

[taruroy]

I am initializing and using a file static nvs handle for getting and setting variables.

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1. static nvs_handle xNvsHandle;
2.  
3. void vInitNVS()
4. {
5.     esp_err_t err = nvs_flash_init();
6.     if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
7.         ESP_ERROR_CHECK(nvs_flash_erase());
8.         ESP_ERROR_CHECK(nvs_flash_init());
9.     }
10.     ESP_ERROR_CHECK(nvs_open(NVS_NAMESPACE_STORAGE, NVS_READWRITE, &xNvsHandle));
11.     ESP_LOGI("Init Handle val:", "%u", xNvsHandle);
12. }
13.  
14. uint32_t ulGetSeqCounter()
15. {
16.     uint32_t ulSeqCounter;
17.     ESP_LOGI("Get Handle val:", "%u", xNvsHandle);
18.     ESP_ERROR_CHECK(nvs_get_u32(xNvsHandle, "seq", &ulSeqCounter));
19.     return ulSeqCounter;
20. }
21.  
22. void vSetSeqCounter(uint32_t ulSeqCounter)
23. {
24.     ESP_LOGI("Set Handle val:", "%u", xNvsHandle);
25.     ESP_ERROR_CHECK(nvs_set_u32(xNvsHandle, "seq", ulSeqCounter));
26.     ESP_ERROR_CHECK(nvs_commit(xNvsHandle));
27. }

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I have another file which has a file static char array of 33 bytes. This array is used by another function in this file

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1. static char cHex[33];
2.  
3. void foo()
4. {
5.       // copy data to cHex ( have ensured that it is null terminated on the 32nd index)
6. }

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Problem: The xNvsHandle handle gets overwritten each time foo is called

Log:
I (28) Init Handle val:: 1
I (118) Get Handle val:: 1
foo() called
I (1148) Set Handle val:: 1177764422

The issue gets solved when I move the cHex array to inside foo() and make it non-static. i.e

Code: [Select all] [Expand/Collapse]

1. void foo()
2. {
3.        char cHex[33];
4.       // copy data to cHex ( have ensured that it is null terminated on the 32nd index)
5. }

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Why is this happening?

[fly135]

The most obvious answer is that you are writing past the end of cHex.