0030-RP2040-add-lp-and-us-timer.patch

From 9da0254589cc629d7bc602c1ec2280f333c45748 Mon Sep 17 00:00:00 2001
From: Martino Facchin <m.facchin@arduino.cc>
Date: Tue, 23 Feb 2021 16:52:04 +0100
Subject: [PATCH 030/204] RP2040: add lp and us timer

lptimer is deactivated since it's meant to run at 1hz :|
---
 .../TARGET_RP2040/lp_ticker.c                 | 114 ++++++++++++++++++
 .../TARGET_RP2040/us_ticker.c                 |  93 ++++++++++++++
 targets/targets.json                          |   2 +
 3 files changed, 209 insertions(+)
 create mode 100644 targets/TARGET_RASPBERRYPI/TARGET_RP2040/lp_ticker.c
 create mode 100644 targets/TARGET_RASPBERRYPI/TARGET_RP2040/us_ticker.c

diff --git a/targets/TARGET_RASPBERRYPI/TARGET_RP2040/lp_ticker.c b/targets/TARGET_RASPBERRYPI/TARGET_RP2040/lp_ticker.c
new file mode 100644
index 0000000000..1e48dcbfd2
--- /dev/null
+++ b/targets/TARGET_RASPBERRYPI/TARGET_RP2040/lp_ticker.c
@@ -0,0 +1,114 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2015 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "lp_ticker_api.h"
+#include "hardware/rtc.h"
+#include "hardware/irq.h"
+#include "hardware/resets.h"
+#include "hardware/clocks.h"
+#include "time.h"
+
+#include "platform/mbed_critical.h"
+
+#define RTC_COUNTER_BITS        32u
+#define RTC_FREQ                1u
+
+#if DEVICE_LPTICKER
+
+/* LP ticker counts with 1Hz resolution */
+const ticker_info_t* lp_ticker_get_info()
+{
+    static const ticker_info_t info = {
+        RTC_FREQ,
+        RTC_COUNTER_BITS
+    };
+    return &info;
+}
+
+static datetime_t now = {
+    .year = 0,
+    .month = 1,
+    .day = 1,
+    .dotw = 0,
+    .hour = 0,
+    .min = 0,
+    .sec = 0
+};
+
+static datetime_t* epoch_to_datetime(timestamp_t epoch, datetime_t* date) {
+    return NULL;
+}
+
+static timestamp_t datetime_to_epoch(datetime_t* date) {
+    struct tm t;
+    time_t t_of_day;
+
+    t.tm_year = date->year;             // Year
+    t.tm_mon = date->month + 1;           // Month, where 0 = jan
+    t.tm_mday = date->day;              // Day of the month
+    t.tm_hour = date->hour;
+    t.tm_min = date->min;
+    t.tm_sec = date->sec;
+    t_of_day = mktime(&t);
+
+    return (long)t_of_day;
+}
+
+void lp_ticker_init(void)
+{
+    if (rtc_running()) {
+        // Populates now struct with existing data
+        lp_ticker_read();
+        return;
+    }
+    rtc_init();
+    rtc_set_datetime(&now);
+}
+
+void lp_ticker_free(void)
+{
+}
+
+uint32_t lp_ticker_read()
+{
+    rtc_get_datetime(&now);
+    return 0; //datetime_to_epoch(&now);
+}
+
+void lp_ticker_set_interrupt(timestamp_t timestamp)
+{
+    timestamp_t target_ts = lp_ticker_read() + timestamp;
+    datetime_t target;
+    epoch_to_datetime(target_ts, &target);
+    rtc_set_alarm(&target, NULL);
+}
+
+void lp_ticker_fire_interrupt(void)
+{
+    rtc_get_datetime(&now);
+    rtc_set_alarm(&now, NULL);
+}
+
+void lp_ticker_disable_interrupt(void)
+{
+    rtc_disable_alarm();
+}
+
+void lp_ticker_clear_interrupt(void)
+{
+}
+
+#endif // DEVICE_LPTICKER
diff --git a/targets/TARGET_RASPBERRYPI/TARGET_RP2040/us_ticker.c b/targets/TARGET_RASPBERRYPI/TARGET_RP2040/us_ticker.c
new file mode 100644
index 0000000000..00edf82830
--- /dev/null
+++ b/targets/TARGET_RASPBERRYPI/TARGET_RP2040/us_ticker.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2013 Nordic Semiconductor ASA
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright notice, this list
+ *      of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA
+ *      integrated circuit in a product or a software update for such product, must reproduce
+ *      the above copyright notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the distribution.
+ *
+ *   3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be
+ *      used to endorse or promote products derived from this software without specific prior
+ *      written permission.
+ *
+ *   4. This software, with or without modification, must only be used with a
+ *      Nordic Semiconductor ASA integrated circuit.
+ *
+ *   5. Any software provided in binary or object form under this license must not be reverse
+ *      engineered, decompiled, modified and/or disassembled.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "us_ticker_api.h"
+#include "mbed_critical.h"
+#include "hardware/timer.h"
+
+#define US_TICKER_COUNTER_BITS        32u
+#define US_TICKER_FREQ                1000000
+
+/* us ticker is driven by 1MHz clock and counter length is 32 bits */
+const ticker_info_t* us_ticker_get_info()
+{
+    static const ticker_info_t info = {
+        US_TICKER_FREQ,
+        US_TICKER_COUNTER_BITS
+    };
+    return &info;
+}
+
+const uint8_t alarm_num = 0;
+
+void us_ticker_init(void)
+{
+    hardware_alarm_set_callback(alarm_num, us_ticker_irq_handler);
+}
+
+uint32_t us_ticker_read()
+{
+    return time_us_32();
+}
+
+void us_ticker_set_interrupt(timestamp_t timestamp)
+{
+    core_util_critical_section_enter();
+    absolute_time_t target = {timestamp};
+    hardware_alarm_set_target(alarm_num, target);
+    core_util_critical_section_exit();
+}
+
+void us_ticker_fire_interrupt(void)
+{
+    us_ticker_irq_handler();
+}
+
+void us_ticker_disable_interrupt(void)
+{
+    hardware_alarm_cancel(alarm_num);
+}
+
+void us_ticker_clear_interrupt(void)
+{
+    hardware_alarm_cancel(alarm_num);
+}
+
+void us_ticker_free(void)
+{
+}
diff --git a/targets/targets.json b/targets/targets.json
index d0e00a173c..6b16afb1ad 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -9421,12 +9421,14 @@
         "device_has": [
             "ANALOGIN",
             "I2C",
+            "INTERRUPTIN",
             "PORT_IN",
             "PORT_OUT",
             "PWMOUT",
             "SERIAL",
             "SERIAL_FC",
             "SPI",
+            "USTICKER",
             "USBDEVICE"
         ]
     },
-- 
2.39.1