pcf85063a: Set PICO_INCLUDE_RTC_DATETIME.

And remove set_datetime and get_datetime gracefully when it's not set.

This is a temporary work-around for RP2350 lacking an RTC and not
requiring the datetime_t type. These functions should be re-implemented
in terms of C standards.

drivers/pcf85063a/pcf85063a.cmake

@@ -6,5 +6,9 @@ target_sources(${DRIVER_NAME} INTERFACE
 
 target_include_directories(${DRIVER_NAME} INTERFACE ${CMAKE_CURRENT_LIST_DIR})
 
+# Include datetime_t for cross-compatibility with RP2350 (no RTC) boards
+# TODO: We should migrate away from using this non-standard type
+target_compile_definitions(${DRIVER_NAME} INTERFACE PICO_INCLUDE_RTC_DATETIME=1)
+
 # Pull in pico libraries that we need
-target_link_libraries(${DRIVER_NAME} INTERFACE pico_stdlib hardware_i2c pimoroni_i2c)
+target_link_libraries(${DRIVER_NAME} INTERFACE pico_stdlib pico_util hardware_i2c pimoroni_i2c)

drivers/pcf85063a/pcf85063a.cpp

@@ -53,6 +53,8 @@ namespace pimoroni {
     return interrupt;
   }
 
+#if PICO_INCLUDE_RTC_DATETIME
+
   datetime_t PCF85063A::get_datetime() {
     uint8_t result[7] = {0};
 
@@ -85,6 +87,8 @@ namespace pimoroni {
     i2c->write_bytes(address, Registers::SECONDS, data, 7);
   }
 
+#endif
+
   void PCF85063A::set_alarm(int second, int minute, int hour, int day) {
     uint8_t alarm[5] = {
       uint8_t(second != PARAM_UNUSED ? bcd_encode(second) : 0x80),

drivers/pcf85063a/pcf85063a.hpp

@@ -108,10 +108,12 @@ namespace pimoroni {
     int get_scl() const;
     int get_int() const;
 
+#if PICO_INCLUDE_RTC_DATETIME
     // Set and get the date and time
     // Uses datetime_t from pico sdk (hardware/rtc) for compatibility
     datetime_t get_datetime();
     void set_datetime(datetime_t *t);
+#endif
 
     // Alarm manipulation methods
     void set_alarm(int second = PARAM_UNUSED, int minute = PARAM_UNUSED,