From 21ba1201b2541a697dc98f0bb78feb0b3b8f9885 Mon Sep 17 00:00:00 2001
From: Raphael Lehmann <raphael@rleh.de>
Date: Fri, 25 Feb 2022 01:17:27 +0100
Subject: [PATCH] [example] RTC MCP7941x on Raspberry Pico

---
 examples/rp_pico/rtc_mcp7941x/main.cpp    | 147 ++++++++++++++++++++++
 examples/rp_pico/rtc_mcp7941x/project.xml |  17 +++
 2 files changed, 164 insertions(+)
 create mode 100644 examples/rp_pico/rtc_mcp7941x/main.cpp
 create mode 100644 examples/rp_pico/rtc_mcp7941x/project.xml

diff --git a/examples/rp_pico/rtc_mcp7941x/main.cpp b/examples/rp_pico/rtc_mcp7941x/main.cpp
new file mode 100644
index 0000000000..5a2a280f48
--- /dev/null
+++ b/examples/rp_pico/rtc_mcp7941x/main.cpp
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2022, Raphael Lehmann
+ *
+ * This file is part of the modm project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+// ----------------------------------------------------------------------------
+
+#include <modm/board.hpp>
+#include <modm/debug/logger.hpp>
+#include <modm/driver/rtc/mcp7941x.hpp>
+#include <modm/processing/protothread.hpp>
+#include <modm/processing/timer.hpp>
+#include <optional>
+
+
+// Set the log level
+#undef MODM_LOG_LEVEL
+#define MODM_LOG_LEVEL modm::log::INFO
+
+// Create an IODeviceWrapper around the Uart Peripheral we want to use
+modm::IODeviceWrapper<Uart0, modm::IOBuffer::BlockIfFull> loggerDevice;
+
+// Set all four logger streams to use the UART
+modm::log::Logger modm::log::debug(loggerDevice);
+modm::log::Logger modm::log::info(loggerDevice);
+modm::log::Logger modm::log::warning(loggerDevice);
+modm::log::Logger modm::log::error(loggerDevice);
+
+
+using MyI2cMaster	= modm::platform::I2cMaster0;
+using I2cScl 		= modm::platform::Gpio1;
+using I2cSda 		= modm::platform::Gpio0;
+
+
+class RtcThread : public modm::pt::Protothread
+{
+public:
+	bool
+	update()
+	{
+		PT_BEGIN();
+
+		if(PT_CALL(rtc.oscillatorRunning())) {
+			MODM_LOG_ERROR << "RTC oscillator is running." << modm::endl;
+		}
+		else {
+			MODM_LOG_ERROR << "RTC oscillator is NOT running." << modm::endl;
+		}
+
+		MODM_LOG_INFO << "Setting date/time to 01.01.2020 00:00.00h" << modm::endl;
+		dateTime.days = 1;
+		dateTime.months = 1;
+		dateTime.years = 20;
+		dateTime.hours = 0;
+		dateTime.minutes = 0;
+		dateTime.seconds = 0;
+		while(not PT_CALL(rtc.setDateTime(dateTime))) {
+			MODM_LOG_ERROR << "Unable to set date/time." << modm::endl;
+			timeout.restart(500ms);
+			PT_WAIT_UNTIL(timeout.isExpired());
+		}
+
+		timeout.restart(500ms);
+		PT_WAIT_UNTIL(timeout.isExpired());
+
+		if(PT_CALL(rtc.oscillatorRunning())) {
+			MODM_LOG_ERROR << "RTC oscillator is running." << modm::endl;
+		}
+		else {
+			MODM_LOG_ERROR << "RTC oscillator is NOT running." << modm::endl;
+		}
+
+		while (true)
+		{
+			dateTime2 = PT_CALL(rtc.getDateTime());
+			if(dateTime2.has_value()) {
+				MODM_LOG_INFO.printf("%02u.%02u.%02u ", dateTime2->days, dateTime2->months, dateTime2->years);
+				MODM_LOG_INFO.printf("%02u:%02u.%02uh\n", dateTime2->hours, dateTime2->minutes, dateTime2->seconds);
+			}
+			else {
+				MODM_LOG_ERROR << "Unable to read from RTC." << modm::endl;
+			}
+
+			timeout.restart(2500ms);
+			PT_WAIT_UNTIL(timeout.isExpired());
+		}
+
+		PT_END();
+	}
+
+private:
+	modm::Mcp7941x<MyI2cMaster> rtc{};
+	modm::mcp7941x::DateTime dateTime{};
+	std::optional<modm::mcp7941x::DateTime> dateTime2{};
+	modm::ShortTimeout timeout;
+};
+
+
+using namespace Board;
+
+int
+main()
+{
+	Board::initialize();
+
+	// initialize Uart0 for MODM_LOG_*
+	Uart0::connect<GpioOutput16::Tx>();
+	Uart0::initialize<Board::SystemClock, 115200_Bd>();
+
+	Leds::setOutput();
+
+	MyI2cMaster::connect<I2cScl::Scl, I2cSda::Sda>();
+	MyI2cMaster::initialize<SystemClock, 100_kHz>();
+
+	MODM_LOG_INFO << "RTC MCP7941x Example on Raspberry Pico" << modm::endl;
+
+	modm::Mcp7941xEeprom<MyI2cMaster> eeprom{};
+	if (auto data = RF_CALL_BLOCKING(eeprom.getUniqueId())) {
+		MODM_LOG_INFO << "Unique ID (EUI-48/64): ";
+		MODM_LOG_INFO << modm::hex << (*data)[0] << modm::ascii << ":";
+		MODM_LOG_INFO << modm::hex << (*data)[1] << modm::ascii << ":";
+		MODM_LOG_INFO << modm::hex << (*data)[2] << modm::ascii << ":";
+		MODM_LOG_INFO << modm::hex << (*data)[3] << modm::ascii << ":";
+		MODM_LOG_INFO << modm::hex << (*data)[4] << modm::ascii << ":";
+		MODM_LOG_INFO << modm::hex << (*data)[5] << modm::ascii << ":";
+		MODM_LOG_INFO << modm::hex << (*data)[6] << modm::ascii << ":";
+		MODM_LOG_INFO << modm::hex << (*data)[7] << modm::ascii << modm::endl;
+	}
+	else {
+		MODM_LOG_ERROR << "Unable to read unique ID from RTC." << modm::endl;
+	}
+	modm::delay(500ms);
+
+	RtcThread rtcThread;
+
+	while (true)
+	{
+		LedGreen::toggle();
+		rtcThread.update();
+	}
+
+	return 0;
+}
diff --git a/examples/rp_pico/rtc_mcp7941x/project.xml b/examples/rp_pico/rtc_mcp7941x/project.xml
new file mode 100644
index 0000000000..b24d0343e3
--- /dev/null
+++ b/examples/rp_pico/rtc_mcp7941x/project.xml
@@ -0,0 +1,17 @@
+<library>
+  <extends>modm:rp-pico</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/rp_pico/rtc_mcp7941x</option>
+    <option name="modm:platform:cortex-m:vector_table_location">ram</option>
+  </options>
+  <modules>
+    <module>modm:debug</module>
+    <module>modm:driver:mcp7941x</module>
+    <module>modm:io</module>
+    <module>modm:platform:i2c:0</module>
+    <module>modm:platform:uart:0</module>
+    <module>modm:processing:protothread</module>
+    <module>modm:processing:timer</module>
+    <module>modm:build:scons</module>
+  </modules>
+</library>