Em_EEPROM Component Read Function Returns Incorrect Data when Restored from a Redundant Copy - KBA227530
- Subscribe to RSS Feed
- Mark as New
- Mark as Read
- Bookmark
- Subscribe
- Printer Friendly Page
- Report Inappropriate Content
Author: OleksandrP_61 Version: **
Context:
PSoC® Creator™ 4.2 project with the Em_EEPROM Component v2_0, v2_10 or v2_20, for PSoC 3, PSoC 4, PSoC 5LP, or PSoC 6 MCU devices.
ModusToolbox™ IDE project with psoc6sw-1.0 or psoc6sw-1.1 libraries which uses the Emulated EEPROM middleware for PSoC 6 MCU.
Issue:
When a redundant copy is enabled and data is restored from the redundant copy, the Em_EEPROM_Read() and Cy_Em_EEPROM_Read() functions restore the data in Em_EEPROM, but return incorrect data as a result. The second read operation returns the correct data from Em_EEPROM.
Cause:
This issue is caused by an error in the pointer arithmetic – the sum operation is performed on two operands with different types (uint32_t * and uint32_t), which causes unpredictable operation results.
Workaround:
You can fix the issue using the following workaround:
1. Locate the cy_em_eeprom.c file and create a backup for it. Depending on the PSoC family and Component version, this file is located in the following directory:
PSoC Creator 4.2 and PSoC 3, PSoC 4, or PSoC 5LP:
a. Em_EEPROM v2_10
C:\Users\<Username>\Documents\PSoC Creator\4.2\Downloads ( 4.2).cylib\Em_EEPROM_Dynamic_v2_10\API\cy_em_eeprom.c
b. Em_EEPROM v2_20
C:\Users\<Username>\Documents\PSoC Creator\4.2\Downloads ( 4.2).cylib\Em_EEPROM_Dynamic_v2_20\API\cy_em_eeprom.c
PSoC Creator 4.2 and PSoC 6 MCU:
a. PDL 3.0.4
C:\Program Files (x86)\Cypress\PDL\3.0.4\middleware\em_eeprom\cy_em_eeprom.c
b. PDL 3.1.0
C:\Program Files (x86)\Cypress\PDL\3.1.0\middleware\em_eeprom\cy_em_eeprom.c
ModusToolbox and PSoC 6 MCU:
a. ModusToolbox v1.0
<user_home>\ModusToolbox_1.0\libraries\psoc6sw-1.0\components\psoc6mw\em_eeprom\cy_em_eeprom.c
b. ModusToolbox v1.1
<user_home>\ModusToolbox_1.1\libraries\psoc6sw-1.1\components\psoc6mw\em_eeprom\cy_em_eeprom.c
2. Update the CheckCrcAndCopy() function code in the cy_em_eeprom.c file.
Note To perform code update for PSoC Creator and PSoC 6 MCU, run your editor software with Administrator rights.
Find the following code:
if(CY_EM_EEPROM_SUCCESS == ret) { (void)memcpy((void *)(dstAddr), (void *)(writeRamBuffer + rowOffset), numBytes); } ... |
Replace found above code with the following code containing the workaround:
if(CY_EM_EEPROM_SUCCESS == ret) { (void)memcpy((void *)(dstAddr), (void *)((uint32_t)writeRamBuffer + rowOffset), numBytes); } ... |