LPC 546 EEPROM data corruption after deep sleep exit

[emblink182]

Working with LPC54605J512BD100 encountered a strange problem with on-chip EEPROM. After MCU exiting deep sleep mode and read from EEPROM, data get corrupted.

I used the SDK_2.6.0_LPC54605J512eeprom example and MCUXpresso IDE to demonstrate the problem. The code is straight forward, write data to EEPROM, switch the clock to fro, deep sleep, woke-up by RTC, switch to pll out, and first read returns corrupted data. The next 2 reads are ok, but if perform EEPROM write and try to read back the result will be 0. After that, write-read operations work fine. Here are Log messages.

EEPROM example begins...
EEPROM Write c0de
EEPROM Read Data Before Sleep = c0de
Enter Deep Sleep!
Sleep Time = 100 ms
EEPROM Read Data After Sleep = 99939b08
EEPROM Read Data After Sleep = c0de
EEPROM Read Data After Sleep = c0de
EEPROM Write Data After Sleep 1234
EEPROM Read Data After Sleep = 0
EEPROM Read Data After Sleep = 0
EEPROM Write Data After Sleep 5678
EEPROM Read Data After Sleep = 5678

I'm using libpower_softabi.a. Add project to attachments. 

/*******************************************************************************
* Includes
******************************************************************************/
#include "fsl_device_registers.h"
#include "fsl_debug_console.h"
#include "board.h"

#include "fsl_eeprom.h"
#include "fsl_power.h"
#include "fsl_rtc.h"

#include "pin_mux.h"
#include <stdbool.h>
/*******************************************************************************
* Definitions
******************************************************************************/
#define EEPROM_SOURCE_CLOCK kCLOCK_BusClk
#define EEPROM_CLK_FREQ CLOCK_GetFreq(kCLOCK_BusClk)
#define EXAMPLE_EEPROM EEPROM

/*******************************************************************************
* Prototypes
******************************************************************************/
#define FSL_FEATURE_EEPROM_PAGE_SIZE (FSL_FEATURE_EEPROM_SIZE / FSL_FEATURE_EEPROM_PAGE_COUNT)
#define DEEP_SLEEP_ENABLED_PERIPH (SYSCON_PDRUNCFG_PDEN_SRAM0_MASK | SYSCON_PDRUNCFG_PDEN_SRAM1_2_3_MASK |\
SYSCON_PDRUNCFG_PDEN_USB_RAM_MASK | SYSCON_PDRUNCFG_PDEN_SRAMX_MASK)
#define EEPROM_DATA 0xC0DE
#define DEEP_SLEEP_TIME 100U
/*******************************************************************************
* Code
******************************************************************************/
/*!
* @brief Main function
*/
int main(void)
{
eeprom_config_t config;
uint32_t sourceClock_Hz = 0;

/* attach 12 MHz clock to FLEXCOMM0 (debug console) */
CLOCK_AttachClk(BOARD_DEBUG_UART_CLK_ATTACH);

BOARD_InitPins();
BOARD_BootClockPLL180M();
BOARD_InitDebugConsole();

PRINTF("EEPROM example begins...\r\n");

/* Init EEPROM */
EEPROM_GetDefaultConfig(&config);
sourceClock_Hz = EEPROM_CLK_FREQ;
EEPROM_Init(EXAMPLE_EEPROM, &config, sourceClock_Hz);

PRINTF("EEPROM Write %x\n", EEPROM_DATA);
EEPROM_WriteWord(EXAMPLE_EEPROM, 0, EEPROM_DATA);

uint32_t readData = *((uint32_t *)(FSL_FEATURE_EEPROM_BASE_ADDRESS));
PRINTF("EEPROM Read Data Before Sleep = %x\n", readData);

/* Init RTC */
RTC_Init(RTC);
RTC_Reset(RTC);
NVIC_ClearPendingIRQ(RTC_IRQn);
RTC_EnableInterrupts(RTC, RTC_CTRL_WAKEDPD_EN_MASK);
EnableIRQ(RTC_IRQn);
EnableDeepSleepIRQ(RTC_IRQn);

/* Enter Deep Sleep for 100 ms */
BOARD_BootClockFRO12M();

PRINTF("Enter Deep Sleep!\n");
RTC_SetWakeupCount(RTC, DEEP_SLEEP_TIME);
RTC_StartTimer(RTC);
POWER_EnterDeepSleep((uint64_t)(DEEP_SLEEP_ENABLED_PERIPH));
RTC_StopTimer(RTC);
uint16_t sleepCount = DEEP_SLEEP_TIME - RTC_GetWakeupCount(RTC);
PRINTF("Sleep Time = %d ms\n", sleepCount);

BOARD_BootClockPLL180M();

readData = *((uint32_t *)(FSL_FEATURE_EEPROM_BASE_ADDRESS));
PRINTF("EEPROM Read Data After Sleep = %x\n", readData);

readData = *((uint32_t *)(FSL_FEATURE_EEPROM_BASE_ADDRESS));
PRINTF("EEPROM Read Data After Sleep = %x\n", readData);

readData = *((uint32_t *)(FSL_FEATURE_EEPROM_BASE_ADDRESS));
PRINTF("EEPROM Read Data After Sleep = %x\n", readData);

PRINTF("EEPROM Write Data After Sleep %x\n", 0x1234);
EEPROM_WriteWord(EXAMPLE_EEPROM, 0, 0x1234);

readData = *((uint32_t *)(FSL_FEATURE_EEPROM_BASE_ADDRESS));
PRINTF("EEPROM Read Data After Sleep = %x\n", readData);

readData = *((uint32_t *)(FSL_FEATURE_EEPROM_BASE_ADDRESS));
PRINTF("EEPROM Read Data After Sleep = %x\n", readData);

PRINTF("EEPROM Write Data After Sleep %x\n", 0x5678);
EEPROM_WriteWord(EXAMPLE_EEPROM, 0, 0x5678);

readData = *((uint32_t *)(FSL_FEATURE_EEPROM_BASE_ADDRESS));
PRINTF("EEPROM Read Data After Sleep = %x\n", readData);

while (1)
{
}
}

void RTC_IRQHandler(void)
{
RTC_ClearStatusFlags(RTC, RTC_CTRL_WAKE1KHZ_MASK);
}

[Alice_Yang]

Helllo Alex Tepliy,

After waked up from deep sleep mode, try to reset the EEPROM:

    RESET_PeripheralReset(kEEPROM_RST_SHIFT_RSTn);

Have a great day,
TIC

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[emblink182]

Dear Alice_Yang, thanks for your answer! Peripheral reset fixed this problem.

I have a few extra questions if you mind answer them.
1) Do I need to call eeprom_init after peripheral reset call?
2) In your opinion, what was the cause of the problem?
3) I inspect the source code of libpower.a and found a define PDRUNCFG0_PD_VDDCORE_EE witch marked as a reserved field in the datasheet. When I add this define to DEEP_SLEEP_ENABLED_PERIPH together with SYSCON_PDRUNCFG_PDEN_VD6_MASK  eeprom worked fine. Does this flag relate to eeprom?