I want to know how to show how to use the energy harvesting feature based on the ST25DV-I2C-04K in combination with an STM32L476 MCU.I have noticed that there is a code named EH energy collection, can you power L476 to make it run normally?
void MX_NFC7_EH_Init(void)
{
ST25DVxxKC_EN_STATUS_E value_eh_dyn;
ST25DVxxKC_EH_MODE_STATUS_E value_eh_mode;
/* Configuration of X-NUCLEO-NFC07A1 */
/******************************************************************************/
/* Init of the Leds on X-NUCLEO-NFC07A1 board */
NFC07A1_LED_Init(GREEN_LED );
NFC07A1_LED_Init(BLUE_LED );
NFC07A1_LED_Init(YELLOW_LED );
NFC07A1_LED_On( GREEN_LED );
HAL_Delay( 300 );
NFC07A1_LED_On( BLUE_LED );
HAL_Delay( 300 );
NFC07A1_LED_On( YELLOW_LED );
HAL_Delay( 300 );
/* Init ST25DVxxKC driver */
while( NFC07A1_NFCTAG_Init(NFC07A1_NFCTAG_INSTANCE) != NFCTAG_OK );
/* Init User button to allow user to change EH configuration */
BSP_PB_Init( BUTTON_KEY, BUTTON_MODE_GPIO );
/* Init done */
NFC07A1_LED_Off( GREEN_LED );
HAL_Delay( 300 );
NFC07A1_LED_Off( BLUE_LED );
HAL_Delay( 300 );
NFC07A1_LED_Off( YELLOW_LED );
HAL_Delay( 300 );
/* Check status of Energy Harvesting static configuration */
NFC07A1_NFCTAG_ReadEHMode(NFC07A1_NFCTAG_INSTANCE, &value_eh_mode );
if( value_eh_mode == ST25DVXXKC_EH_ACTIVE_AFTER_BOOT )
{
/* Energy Harvesting is set after each boot, LED 1 is on */
NFC07A1_LED_On( GREEN_LED );
}
else
{
/* Energy Harvesting is reset after each boot, LED 1 is off */
NFC07A1_LED_Off( GREEN_LED );
}
/* Check status of Energy Harvesting static configuration */
NFC07A1_NFCTAG_GetEHENMode_Dyn(NFC07A1_NFCTAG_INSTANCE, &value_eh_dyn );
if( value_eh_dyn == ST25DVXXKC_DISABLE )
{
/* Energy Harvesting is disabled, LED 2 is on */
NFC07A1_LED_Off( BLUE_LED );
}
else
{
/* Energy Harvesting is activated, LED 2 is on */
NFC07A1_LED_On( BLUE_LED );
}
}
/**
* @brief Process of the NFC7 EH application
* @retval None
*/
void MX_NFC7_EH_Process(void)
{
ST25DVxxKC_PASSWD_t passwd;
ST25DVxxKC_EN_STATUS_E value_eh_dyn;
ST25DVxxKC_EH_MODE_STATUS_E value_eh_mode;
ST25DVxxKC_I2CSSO_STATUS_E i2csso;
uint32_t tick_start;
uint32_t tick_end;
/*Detect button press*/
if(BSP_PB_GetState( BUTTON_KEY ) == BUTTON_PRESSED)
{
tick_start = HAL_GetTick();
/* Debouncing */
HAL_Delay(50);
do
{
tick_end = HAL_GetTick();
} while ((BSP_PB_GetState( BUTTON_KEY ) == BUTTON_PRESSED) && (tick_end - tick_start) <= 1000);
if((tick_end - tick_start) > 1000)
{
/* Long Button press */
/* Wait until the button is released */
while ((BSP_PB_GetState( BUTTON_KEY ) == BUTTON_PRESSED));
/* Debouncing */
HAL_Delay(50);
/* When user button is released after 1s, toggle Energy Harvesting static configuration */
/* You need to present password to change static configuration */
NFC07A1_NFCTAG_ReadI2CSecuritySession_Dyn(NFC07A1_NFCTAG_INSTANCE, &i2csso );
if( i2csso == ST25DVXXKC_SESSION_CLOSED )
{
/* if I2C session is closed, present password to open session */
passwd.MsbPasswd = 0;
passwd.LsbPasswd = 0;
NFC07A1_NFCTAG_PresentI2CPassword(NFC07A1_NFCTAG_INSTANCE, passwd );
}
/* Toggle static configuration */
NFC07A1_NFCTAG_ReadEHMode(NFC07A1_NFCTAG_INSTANCE, &value_eh_mode );
if( value_eh_mode == ST25DVXXKC_EH_ACTIVE_AFTER_BOOT )
{
/* Let the user activate energy harvesting */
value_eh_mode = ST25DVXXKC_EH_ON_DEMAND;
NFC07A1_NFCTAG_WriteEHMode(NFC07A1_NFCTAG_INSTANCE, value_eh_mode );
NFC07A1_LED_Off( GREEN_LED );
}
else
{
/* Energy harvesting activated after Power On Reset */
value_eh_mode = ST25DVXXKC_EH_ACTIVE_AFTER_BOOT;
NFC07A1_NFCTAG_WriteEHMode(NFC07A1_NFCTAG_INSTANCE, value_eh_mode );
NFC07A1_LED_On( GREEN_LED );
}
}
else
{
/* Short Button press */
/* Button already released */
/* Debouncing */
HAL_Delay(50);
/* When user button is pressed, toggle Energy Harvesting dynamic configuration */
NFC07A1_NFCTAG_GetEHENMode_Dyn(NFC07A1_NFCTAG_INSTANCE, &value_eh_dyn );
if( value_eh_dyn == ST25DVXXKC_DISABLE )
{
/* Enable energy harvesting */
NFC07A1_NFCTAG_SetEHENMode_Dyn(NFC07A1_NFCTAG_INSTANCE);
NFC07A1_LED_On( BLUE_LED );
}
else
{
/* Disable energy harvesting */
NFC07A1_NFCTAG_ResetEHENMode_Dyn(NFC07A1_NFCTAG_INSTANCE);
NFC07A1_LED_Off( BLUE_LED );
}
}
}
}
#ifdef __cplusplus
}
#endif
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
Hi @Schuyler (Community Member),
The Leds on the NFC07 expansion board are not wired to work with EH. To use the EH feature with other component you need to wired the ST1 pin 3 to another component to see this feature in live.
In other terms you need to design your own board for that.
But if you just want to make a try, one possible solution would be to connect the ST1 pin3 (EH pin) to the Arduino connector CN9#6 (as the picture below). and when you approach the RF field it will turn on the Green Led. (without STM32L476 Nucleo board connected).
If you allow me to give you one advice, I think you should read the documentation more thoroughly to understand how this feature works.
I hope this will help you.
Kind Regards.
