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button detection

This commit is contained in:
olikraus 2017-04-17 08:57:56 +02:00
parent ab992a7495
commit 406ea042aa
2 changed files with 87 additions and 15 deletions
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7
sys/arm/stm32l031x6/info.txt
View File

@ -102,3 +102,10 @@ steampunk
http://www.rattlebrained.org/articles/diy-pvc-train-whistle
===========
TODO, 17 Apr 2017
- Pullups an die buttons und die tamper pullups deaktivieren.
Grund: Ansonsten kann man nicht mehr per reset booten und flashen
- Es wird ja ständig das power interface sowie RTC activiert und deaktiviert.
Das sollte man vermutlich dauerhaft aktiviert lassen.

93
sys/arm/stm32l031x6/u8g2_rtc/main.c
View File

@ -22,21 +22,66 @@ uint8_t u8x8_gpio_and_delay_stm32l0(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int,
/*=======================================================================*/
/* global variables */
#define TAMPER_SYSTICK_DELAY 20
volatile unsigned long SysTickCount = 0;
volatile unsigned long RTCIRQCount = 0;
volatile unsigned long Tamper2Count = 0;
volatile unsigned long Tamper3Count = 0;
rtc_t rtc;
u8g2_t u8g2;
/*=======================================================================*/
/* utility function */
void enableRCCRTCWrite(void) U8G2_NOINLINE;
void enableRCCRTCWrite(void)
{
RCC->APB1ENR |= RCC_APB1ENR_PWREN; /* enable power interface */
PWR->CR |= PWR_CR_DBP; /* activate write access to RCC->CSR and RTC */
}
void disableRCCRTCWrite(void) U8G2_NOINLINE;
void disableRCCRTCWrite(void)
{
PWR->CR &= ~PWR_CR_DBP; /* disable write access to RCC->CSR and RTC */
RCC->APB1ENR &= ~RCC_APB1ENR_PWREN; /* disable power interface */
}
/*=======================================================================*/
void __attribute__ ((interrupt, used)) SysTick_Handler(void)
{
SysTickCount++;
if ( Tamper3Count > 0 )
{
Tamper3Count--;
if ( Tamper3Count == 0 )
{
enableRCCRTCWrite();
RTC->ISR &= ~RTC_ISR_TAMP3F; /* clear tamper flag, allow new tamper event */
disableRCCRTCWrite();
}
}
if ( Tamper2Count > 0 )
{
Tamper2Count--;
if ( Tamper2Count == 0 )
{
enableRCCRTCWrite();
RTC->ISR &= ~RTC_ISR_TAMP2F; /* clear tamper flag, allow new tamper event */
disableRCCRTCWrite();
}
}
}
void __attribute__ ((interrupt, used)) RTC_IRQHandler(void)
{
if ( (EXTI->PR & EXTI_PR_PIF20) != 0 )
enableRCCRTCWrite();
if ( (EXTI->PR & EXTI_PR_PIF20) != 0 ) /* interrupt caused by wake up */
{
EXTI->PR = EXTI_PR_PIF20; /* wake up is connected to line 20, clear this IRQ */
}
@ -45,14 +90,25 @@ void __attribute__ ((interrupt, used)) RTC_IRQHandler(void)
/* in principle, this should happen only when a IRQ line 20 IRQ happens, but */
/* it will be more safe to clear this flag for any interrupt */
RCC->APB1ENR |= RCC_APB1ENR_PWREN; /* enable power interface */
PWR->CR |= PWR_CR_DBP; /* activate write access to RCC->CSR and RTC */
RTC->ISR &= ~RTC_ISR_WUTF; /* clear the wake up flag */
PWR->CR &= ~PWR_CR_DBP; /* disable write access to RCC->CSR and RTC */
RCC->APB1ENR &= ~RCC_APB1ENR_PWREN; /* disable power interface */
if ( (EXTI->PR & EXTI_PR_PIF19) != 0 ) /* interrupt caused by tamper event */
{
EXTI->PR = EXTI_PR_PIF19; /* clear tamper IRQ */
/* The TAMPxF flag has to be cleared, but this is done in the systick handler after some delay */
//RTC->ISR &= ~RTC_ISR_TAMP3F;
//RTC->ISR &= ~RTC_ISR_TAMP2F;
if ( RTC->ISR & RTC_ISR_TAMP3F )
Tamper3Count = TAMPER_SYSTICK_DELAY;
if ( RTC->ISR & RTC_ISR_TAMP2F )
Tamper2Count = TAMPER_SYSTICK_DELAY;
}
disableRCCRTCWrite();
RTCIRQCount++;
}
@ -161,8 +217,8 @@ void initDisplay(void)
void initRTC(void)
{
/* real time clock enable */
RCC->APB1ENR |= RCC_APB1ENR_PWREN; /* enable power interface */
PWR->CR |= PWR_CR_DBP; /* activate write access to RCC->CSR and RTC */
enableRCCRTCWrite();
RTC->WPR = 0x0ca; /* disable RTC write protection */
RTC->WPR = 0x053;
@ -196,8 +252,7 @@ void initRTC(void)
RTC->WPR = 0; /* enable RTC write protection */
RTC->WPR = 0;
PWR->CR &= ~PWR_CR_DBP; /* disable write access to RCC->CSR and RTC */
RCC->APB1ENR &= ~RCC_APB1ENR_PWREN; /* disable power interface */
disableRCCRTCWrite();
}
/*=======================================================================*/
@ -209,8 +264,8 @@ void initRTC(void)
void startRTCWakeUp(void)
{
/* wake up time setup & start */
RCC->APB1ENR |= RCC_APB1ENR_PWREN; /* enable power interface */
PWR->CR |= PWR_CR_DBP; /* activate write access to RCC->CSR and RTC */
enableRCCRTCWrite();
RTC->WPR = 0x0ca; /* disable RTC write protection */
RTC->WPR = 0x053;
@ -226,14 +281,24 @@ void startRTCWakeUp(void)
RTC->ISR &= ~RTC_ISR_WUTF; /* clear the wake up flag... is this required? */
/* tamper (button) detection */
/* low level, filtered, pullup enabled, IRQ enabled, Sample Freq is 128Hz */
RTC->TAMPCR =
RTC_TAMPCR_TAMP3NOERASE | RTC_TAMPCR_TAMP3IE | RTC_TAMPCR_TAMP3E |
RTC_TAMPCR_TAMP2NOERASE | RTC_TAMPCR_TAMP2IE | RTC_TAMPCR_TAMP2E |
RTC_TAMPCR_TAMPPRCH_0 | RTC_TAMPCR_TAMPFLT_1 | RTC_TAMPCR_TAMPFREQ;
/* wake up IRQ is connected to line 20 */
EXTI->RTSR |= EXTI_RTSR_RT20; /* rising edge for wake up line */
EXTI->IMR |= EXTI_IMR_IM20; /* interrupt enable */
/* tamper IRQ is connected to line 19 */
EXTI->RTSR |= EXTI_RTSR_RT19; /* rising edge for wake up line */
EXTI->IMR |= EXTI_IMR_IM19; /* interrupt enable */
RTC->WPR = 0; /* enable RTC write protection */
RTC->WPR = 0;
PWR->CR &= ~PWR_CR_DBP; /* disable write access to RCC->CSR and RTC */
RCC->APB1ENR &= ~RCC_APB1ENR_PWREN; /* disable power interface */
disableRCCRTCWrite();
}