Code examples RM0367
1012/1043 RM0367 Rev 7
| RTC_TAFCR_TAMP2E | RTC_TAFCR_TAMPIE;
A.15.7 RTC tamper and time stamp code example
/* Check tamper and timestamp flag */
if(((RTC->ISR & (RTC_ISR_TAMP2F)) == (RTC_ISR_TAMP2F)) && ((RTC->ISR &
(RTC_ISR_TSF)) == (RTC_ISR_TSF)))
{
RTC->ISR =~ (RTC_ISR_TAMP2F); /* clear tamper flag */
EXTI->PR = EXTI_PR_PR19; /* clear exti line 19 flag */
TimeToCompute = RTC->TSTR; /* get tamper time in timestamp register */
RTC->ISR =~ (RTC_ISR_TSF); /* clear timestamp flag */
}
A.15.8 RTC clock output code example
/* (1) Write access for RTC registers */
/* (2) Disable alarm A to modify it */
/* (3) Wait until it is allow to modify alarm A value */
/* (4) Modify alarm A mask to have an interrupt each 1Hz */
/* (5) Enable alarm A and alarm A interrupt, calibration output (1Hz)
enable */
/* (6) Disable write access */
RTC->WPR = 0xCA; /* (1) */
RTC->WPR = 0x53; /* (1) */
RTC->CR &=~ RTC_CR_ALRAE; /* (2) */
while((RTC->ISR & RTC_ISR_ALRAWF) != RTC_ISR_ALRAWF) /* (3) */
{
/* add time out here for a robust application */
}
RTC->ALRMAR = RTC_ALRMAR_MSK4 | RTC_ALRMAR_MSK3 | RTC_ALRMAR_MSK2 |
RTC_ALRMAR_MSK1; /* (4) */
RTC->CR = RTC_CR_ALRAIE | RTC_CR_ALRAE | RTC_CR_COE | RTC_CR_COSEL; /*(5 */
RTC->WPR = 0xFE; /* (6) */
RTC->WPR = 0x64; /* (6) */
A.16 I2C code example
A.16.1 I2C configured in slave mode code example
/* (1) Timing register value is computed with the AN4235 xls file,
fast Mode @400kHz with I2CCLK = 16MHz, rise time = 100ns,
fall time = 10ns */
/* (2) Periph enable, address match interrupt enable */
/* (3) 7-bit address = 0x5A */
/* (4) Enable own address 1 */
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