Merge pull request #48 from peterharperuk/sleep_rp2350

Update pico_sleep examples

Author: peterharperuk

sleep/CMakeLists.txt

@@ -1,4 +1,4 @@
 if (NOT PICO_NO_HARDWARE)
-    add_subdirectory_exclude_platforms(hello_dormant "rp2350.*")
-    add_subdirectory_exclude_platforms(hello_sleep "rp2350.*")
+    add_subdirectory(hello_dormant)
+    add_subdirectory(hello_sleep)
 endif ()

sleep/hello_dormant/CMakeLists.txt

@@ -1,8 +1,16 @@
-add_executable(hello_dormant
-        hello_dormant.c
+add_executable(hello_dormant_gpio
+        hello_dormant_gpio.c
         )
+target_link_libraries(hello_dormant_gpio
+        pico_stdlib
+        hardware_sleep)
+pico_add_extra_outputs(hello_dormant_gpio)
 
-target_link_libraries(hello_dormant pico_stdlib hardware_sleep)
-
-# create map/bin/hex file etc.
-pico_add_extra_outputs(hello_dormant)
+add_executable(hello_dormant_aon
+        hello_dormant_aon.c
+        )
+target_link_libraries(hello_dormant_aon
+        pico_stdlib
+        hardware_sleep
+        )
+pico_add_extra_outputs(hello_dormant_aon)

sleep/hello_dormant/hello_dormant.c

@@ -0,0 +1,84 @@
+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "pico/sleep.h"
+
+// For clock_configure_gpin
+#ifdef PICO_RP2040
+#include "hardware/clocks.h"
+#endif
+
+// For RP2040 this example needs an external clock fed into the GP20
+// Note: Only GP20 and GP22 can be used for clock input, See the GPIO function table in the datasheet.
+// You can use another Pico to generate this. See the clocks/hello_gpout example for more details.
+// rp2040: clock_gpio_init(21, CLOCKS_CLK_GPOUT3_CTRL_AUXSRC_VALUE_CLK_RTC, 1); // 46875Hz can only export a clock on gpios 21,23,24,25 and only 21 is exposed by Pico
+// RP2350 has an LPOSC it can use, so doesn't need this
+#define EXTERNAL_CLOCK_INPUT_PIN 20
+#define RTC_FREQ_HZ 46875
+
+static void sleep_callback(void) {
+    printf("AON timer woke us up\n");
+}
+
+static void aon_sleep(void) {
+
+    // Get the time from the aon timer and set our alarm time
+    struct timespec ts;
+    aon_timer_get_time(&ts);
+    ts.tv_sec += 10;
+
+    printf("Sleeping for 10 seconds\n");
+    uart_default_tx_wait_blocking();
+
+#if PICO_RP2040
+    // The RTC must be run from an external source, since the dormant source will be inactive
+    clock_configure_gpin(clk_rtc, EXTERNAL_CLOCK_INPUT_PIN, RTC_FREQ_HZ, 46875);
+#endif
+
+    // Go to sleep for 10 seconds, with RTC running off GP20
+    // The external clock is the RTC of another pico being fed to GP20
+    sleep_goto_dormant_until(&ts, &sleep_callback);
+}
+
+int main() {
+
+    stdio_init_all();
+    printf("Hello Dormant AON Timer!\n");
+
+    struct timespec ts = { .tv_sec = 1723124088, .tv_nsec = 0 };
+    aon_timer_start(&ts);
+
+    while(true) {
+        printf("Awake for 10s\n");
+        sleep_ms(10000);
+
+        uart_default_tx_wait_blocking();
+
+        // Set the crystal oscillator as the dormant clock source, UART will be reconfigured from here
+        // This is necessary before sending the pico dormant
+#if PICO_RP2040
+        printf("Switching to XOSC\n");
+        sleep_run_from_xosc();
+#else
+        printf("Switching to LPSC\n");
+        sleep_run_from_lposc();
+#endif
+
+        uart_default_tx_wait_blocking();
+
+        printf("Going dormant\n");
+        uart_default_tx_wait_blocking();
+
+        // Go to sleep until the RTC interrupt is generated after 10 seconds
+        aon_sleep();
+
+        // Re-enabling clock sources and generators.
+        sleep_power_up();
+    }
+    return 0;
+}

sleep/hello_dormant/hello_dormant_aon.c

@@ -0,0 +1,41 @@
+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "pico/sleep.h"
+
+#define WAKE_GPIO 10
+
+int main() {
+    stdio_init_all();
+    printf("Hello Dormant GPIO!\n");
+
+    printf("Test starting in 10s\n");
+    sleep_ms(10000);
+
+    while(true) {
+        printf("Switching to XOSC\n");
+        uart_default_tx_wait_blocking();
+
+        // Set the crystal oscillator as the dormant clock source, UART will be reconfigured from here
+        // This is necessary before sending the pico into dormancy
+        sleep_run_from_xosc();
+
+        printf("Going dormant until GPIO %d goes edge high\n", WAKE_GPIO);
+        uart_default_tx_wait_blocking();
+
+        // Go to sleep until we see a high edge on GPIO 10
+        sleep_goto_dormant_until_edge_high(WAKE_GPIO);
+
+        // Re-enabling clock sources and generators.
+        sleep_power_up();
+        printf("Now awake for 10s\n");
+        sleep_ms(1000 * 10);
+    }
+
+    return 0;
+}

sleep/hello_dormant/hello_dormant_gpio.c

@@ -1,8 +1,18 @@
-add_executable(hello_sleep
-        hello_sleep.c
+add_executable(hello_sleep_alarm
+        hello_sleep_alarm.c
         )
+target_link_libraries(hello_sleep_alarm
+        pico_stdlib
+        hardware_sleep
+        )
+pico_add_extra_outputs(hello_sleep_alarm)
 
-target_link_libraries(hello_sleep pico_stdlib hardware_sleep)
-
-# create map/bin/hex file etc.
-pico_add_extra_outputs(hello_sleep)
+add_executable(hello_sleep_aon
+        hello_sleep_aon.c
+        )
+target_link_libraries(hello_sleep_aon
+        pico_stdlib
+        hardware_sleep
+        pico_aon_timer
+        )
+pico_add_extra_outputs(hello_sleep_aon)

sleep/hello_sleep/CMakeLists.txt

@@ -0,0 +1,56 @@
+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "pico/sleep.h"
+
+static bool awake;
+
+static void alarm_sleep_callback(uint alarm_id) {
+    printf("alarm woke us up\n");
+    uart_default_tx_wait_blocking();
+    awake = true;
+    hardware_alarm_set_callback(alarm_id, NULL);
+    hardware_alarm_unclaim(alarm_id);
+}
+
+int main() {
+
+    stdio_init_all();
+    printf("Hello Alarm Sleep!\n");
+
+    do {
+        printf("Awake for 10 seconds\n");
+        sleep_ms(1000 * 10);
+
+        printf("Switching to XOSC\n");
+
+        // Wait for the fifo to be drained so we get reliable output
+        uart_default_tx_wait_blocking();
+
+        // Set the crystal oscillator as the dormant clock source, UART will be reconfigured from here
+        // This is only really necessary before sending the pico dormant but running from xosc while asleep saves power
+        sleep_run_from_xosc();
+        awake = false;
+
+        // Go to sleep until the alarm interrupt is generated after 10 seconds
+        printf("Sleeping for 10 seconds\n");
+        uart_default_tx_wait_blocking();
+
+        if (sleep_goto_sleep_for(10000, &alarm_sleep_callback)) {
+            // Make sure we don't wake
+            while (!awake) {
+                printf("Should be sleeping\n");
+            }
+        }
+
+        // Re-enabling clock sources and generators.
+        sleep_power_up();
+    } while(true);
+
+    return 0;
+}