Added funtions to class RTC_PCF8563 for controlling the timer and int… #218
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added 2 commits
January 16, 2021 17:44
…errupt functionality of PCF8563. Also addedd required definition for the respective registers.
edgar-bonet
reviewed
Jan 16, 2021
| @@ -410,6 +412,23 @@ class RTC_PCF8523 { | |||
| void calibrate(Pcf8523OffsetMode mode, int8_t offset); | |||
| }; | |||
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| /** PCF8563 Timer clock source settings */ | |||
| enum PCF8563TimerClockFreq { | |||
| PCF8563_TimerClk4096kHz = 0x00, /**< 4096 kHz */ | |||
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It's not 4096 kilohertz, but 4096 Hz (or, as the datasheet puts it, “4.096 kHz”.
| @@ -1451,6 +1451,90 @@ DateTime RTC_PCF8563::now() { | |||
| return DateTime(y, m, d, hh, mm, ss); | |||
| } | |||
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| /**************************************************************************/ | |||
| /*! | |||
| @brief Enable the Countdown Timer Interrupt on the PCF8563. | |||
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It would be nice if each method had a non-empty @details documentation. And also to have the parameters documented.
RTClib.cpp
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| //write_i2c_register(PCF8563_ADDRESS, PCF8563_TIMER_CONTROL, timer_ctlreg & ~0x03 | clkFreq); | ||
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| // Sets the enable bit TE and the clock source bits TD[1:0] in the timer control register | ||
| write_i2c_register(PCF8563_ADDRESS, PCF8563_TIMER_CONTROL, (timer_ctlreg & ~0x03) | clkFreq | (1 << 7)); | ||
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| // uint8_t timer_ctlreg = read_i2c_register(PCF8563_ADDRESS, PCF8563_TIMER_CONTROL); | ||
| // //if (timer_ctlreg & (1 << 5)) { | ||
| // write_i2c_register(PCF8563_ADDRESS, PCF8563_TIMER_CONTROL, timer_ctlreg | (1 << 7)); | ||
| // //} |
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Please, no not commit commented-out code.
RTClib.cpp
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| uint8_t ctlreg = read_i2c_register(PCF8563_ADDRESS, PCF8563_CONTROL_2); | ||
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| // Reset the enable bit TIE in the control status 2 register leaving other bits unchanged | ||
| write_i2c_register(PCF8563_ADDRESS, PCF8563_CONTROL_2, ctlreg & ~1); |
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The intent should be clearer like this:
Suggested change
| write_i2c_register(PCF8563_ADDRESS, PCF8563_CONTROL_2, ctlreg & ~1); | |
| write_i2c_register(PCF8563_ADDRESS, PCF8563_CONTROL_2, ctlreg & ~PCF8563_CONTROL2_TIE); |
| write_i2c_register(PCF8563_ADDRESS, PCF8563_CONTROL_2, ctlreg & ~1); | ||
| } | ||
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| uint8_t RTC_PCF8563::getAndClearIntFlags(void) { |
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This method also should be documented.
| uint8_t ctlreg = read_i2c_register(PCF8563_ADDRESS, PCF8563_CONTROL_2); | ||
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| // Clear the AF and TF interrupt flags in control status register 2 | ||
| write_i2c_register(PCF8563_ADDRESS, PCF8563_CONTROL_2, ctlreg & ~12); |
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Clearer intent:
Suggested change
| write_i2c_register(PCF8563_ADDRESS, PCF8563_CONTROL_2, ctlreg & ~12); | |
| write_i2c_register(PCF8563_ADDRESS, PCF8563_CONTROL_2, ctlreg & ~(PCF8563_CONTROL2_AF | PCF8563_CONTROL2_TF)); |
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Please review my code and consider this PR.
I've implemented functionality to control the timer and timer interrupt facilities of PCF8563. For this I added the following functions to class RTC_PCF8563:
void enableCountdownTimer(PCF8563TimerClockFreq clkFreq, uint8_t numPeriods);
void disableCountdownTimer(void);
void enableCountdownTimerInt(bool pulse);
void disableCountdownTimerInt(void);
uint8_t getAndClearIntFlags(void);
Also added required definitions in RTClib.h.
This does not cover functionality of alarms and alarm interrupt. Adafruit's own PCF8563 breakout doesn't expose the INT pin, but this might be useful for other boards that ise the functionality or in the future if Adafruit produces a breakout board that exposes the INT pin.
I've successfully tested all the added functionality on a PCF8563 breakout from ANGEEK connected to an arduino UNO. Examples are not included. I'm happy to add any if required.