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Tool/software: Code Composer Studio
Hi, I am using some example code and functions from the MSP430 fram examples
one of the functions from the package allows me to save and load from fram safely (i.e double buffering etc)
It was fine with single variables but when i try to use arrays it seems to clear the memory location every time i do a reset or a power lost
I have tested the storing (commit) and reading (restore) functions seperately and they seem to work with arrays
i think the problem is with the initialization function nvs_data_init
here is the code for nvs_data_init
nvs_data_handle nvs_data_init(uint8_t *storage, uint16_t size)
{
uint8_t *data1;
uint8_t *data2;
uint16_t crc;
uint16_t init_crc1;
uint16_t init_crc2;
nvs_data_status init_status;
nvs_data_header *header;
// Initialize local variables
init_status = NVS_DATA_INIT;
init_crc1 = 0;
init_crc2 = 0;
// Calculate pointer to header and data storage inside the NVS container
header = (nvs_data_header *)storage;
data1 = (uint8_t *)header + sizeof(nvs_data_header);
data2 = data1 + size;
// check status of current container
if ((header->token == NVS_DATA_TOKEN) && (header->size == size)) {
switch (header->status) {
// Storage 1 contains latest data
case NVS_DATA_1:
// Get CRC of storage 1 and check if it matches
crc = nvs_crc(data1, header->size);
if (crc == header->crc1) {
// Matching checksum, return NVS data handle
return (nvs_data_handle)header;
}
else {
// Get CRC of storage 2 and check if it matches
crc = nvs_crc(data2, header->size);
if (crc == header->crc2) {
init_status = NVS_DATA_2;
init_crc2 = crc;
}
}
break;
// Storage 2 contains latest data
case NVS_DATA_2:
// Get CRC of storage 1 and check if it matches
crc = nvs_crc(data2, header->size);
if (crc == header->crc2) {
// Matching checksum, return NVS data handle
return (nvs_data_handle)header;
}
else {
// Get CRC of storage 1 and check if it matches
crc = nvs_crc(data1, header->size);
if (crc == header->crc1) {
init_status = NVS_DATA_1;
init_crc1 = crc;
}
}
break;
default:
// Try to recover status based on valid CRC signature
// since last status is not known, recovering any valid
// CRC is better than losing all information
crc = nvs_crc(data1, header->size);
if (crc == header->crc1) {
init_status = NVS_DATA_1;
init_crc1 = crc;
}
crc = nvs_crc (data2, header->size);
if (crc == header->crc2) {
init_status = NVS_DATA_2;
init_crc2 = crc;
}
break;
}
}
// Unlock FRAM
uint16_t framState = nvs_unlockFRAM();
// Initialize NVS data header
header->token = NVS_DATA_TOKEN;
header->status = init_status;
header->size = size;
header->crc1 = init_crc1;
header->crc2 = init_crc2;
// Lock FRAM
nvs_lockFRAM(framState);
// Return NVS data handle
return (nvs_data_handle)header;
}
Hi ,
The NVS library requires the application to allocated storage before initializing the storage container. The storage can be located in FRAM or information memory and the length can be calculated using the included preprocessor macros. Do you allocate the storage according to the array size you used?
The code snippet below demonstrate how to correctly allocate memory in FRAM for both CCS and IAR.
#if defined(__TI_COMPILER_VERSION__)
#pragma PERSISTENT(nvsStorage)
#elif defined(__IAR_SYSTEMS_ICC__) __persistent
#endif
uint8_t nvsStorage[NVS_LOG_STORAGE_SIZE(SIZE, ENTRIES)] = {0};
Best Regards,
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Winter,
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