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PSoC 4 MCU

jofec_1092871
New Contributor

I had the em_eeprom block working in Creator 3. Now in Creator 4 the block has changed and that code does not work. Surprised by the lack of backward compatibility!

Here is how I have it set. If anyone spots the problem, thanks in advance! - John

EmEEPROM_v2_20 block:

EEPROM Size: 64

Redundant copy: No

Wear Level Factor:  5x

(Actual EEPROM size (bytes):  640

Flash Security:

All blocks W except the last five blocks are U

Build settings; Linker command line:

-Wl.--section-start=.EEPROMDATA=0x00007D80

Code:

#define TAG 0x5a

#define EE_SIZE 3

static const uint8 eepromArray[] __attribute__ ((section (".EEPROMDATA"))) = { ~TAG,0,0};

#define ee_valid_flag (*(volatile uint8 *) &eepromArray[0])

#define ee_control_byte (*(volatile uint8 *) &eepromArray[1])

#define ee_spare (*(volatile uint8 *) &eepromArray[2])

uint8 ram_array[EE_SIZE];

#define valid_flag ram_array[0]

#define control_byte ram_array[1]  // ????temp

#define spare ram_array[2]

int main()

  {

  Em_EEPROM_Init(CY_EM_EEPROM_FLASH_BASE_ADDR);

:

:

  Em_EEPROM_Read(0, ram_array, EE_SIZE); //&Em_EEPROM_context);

:

:

  Em_EEPROM_Write(0, ram_array, EE_SIZE); //&Em_EEPROM_context);

  }

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1 Solution
GeonaP_26
Moderator
Moderator

Em_EEPROM_Init(uint32 startAddress) needs the start address of the Em_EEPROM storage. As per the linker settings, the Em_EEPROM data storage is placed in a custom memory section called EEPROMDATA. However, you are initializing the Em_EEPROM_Init with CY_EM_EEPROM_FLASH_BASE_ADDR (0x00000000u) which returns failure. PSoC 4 do not have seperate Em_EEPROM memory section. It emulates EEPROM using flash. Hence, the CY_EM_EEPROM_FLASH_BASE_ADDR points to flash base ie, 0x00000000u.

Please modify Em_EEPROM_Init to following and you should be good to go.

Em_EEPROM_Init((uint32_t) eepromArray);

Go to CE195313 PSoC Emulated EEPROM for Em_EEPROM code example using the new Em_EEPROM component.

View solution in original post

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2 Replies
GeonaP_26
Moderator
Moderator

Em_EEPROM_Init(uint32 startAddress) needs the start address of the Em_EEPROM storage. As per the linker settings, the Em_EEPROM data storage is placed in a custom memory section called EEPROMDATA. However, you are initializing the Em_EEPROM_Init with CY_EM_EEPROM_FLASH_BASE_ADDR (0x00000000u) which returns failure. PSoC 4 do not have seperate Em_EEPROM memory section. It emulates EEPROM using flash. Hence, the CY_EM_EEPROM_FLASH_BASE_ADDR points to flash base ie, 0x00000000u.

Please modify Em_EEPROM_Init to following and you should be good to go.

Em_EEPROM_Init((uint32_t) eepromArray);

Go to CE195313 PSoC Emulated EEPROM for Em_EEPROM code example using the new Em_EEPROM component.

View solution in original post

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jofec_1092871
New Contributor

Thank you, that fixed it! - John

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