extmod/modmachine: Provide common Python bindings for machine.idle().

And use it in all ports.  The ports are unchanged, except esp8266 which now
just returns None from this function instead of the time elapsed (to match
other ports), and qemu-arm which gains this function.
Signed-off-by: Damien George <damien@micropython.org>

extmod/modmachine.c

@@ -35,6 +35,10 @@
 #include "drivers/dht/dht.h"
 #endif
 
+// The port must provide implementations of these low-level machine functions.
+
+STATIC void mp_machine_idle(void);
+
 // The port can provide additional machine-module implementation in this file.
 #ifdef MICROPY_PY_MACHINE_INCLUDEFILE
 #include MICROPY_PY_MACHINE_INCLUDEFILE
@@ -46,6 +50,12 @@ STATIC mp_obj_t machine_soft_reset(void) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_soft_reset_obj, machine_soft_reset);
 
+STATIC mp_obj_t machine_idle(void) {
+    mp_machine_idle();
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
+
 STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_machine) },
 
@@ -57,6 +67,9 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
     // Reset related functions.
     { MP_ROM_QSTR(MP_QSTR_soft_reset), MP_ROM_PTR(&machine_soft_reset_obj) },
 
+    // Power related functions.
+    { MP_ROM_QSTR(MP_QSTR_idle), MP_ROM_PTR(&machine_idle_obj) },
+
     // Functions for bit protocols.
     #if MICROPY_PY_MACHINE_BITSTREAM
     { MP_ROM_QSTR(MP_QSTR_bitstream), MP_ROM_PTR(&machine_bitstream_obj) },

ports/cc3200/mods/modmachine.c

@@ -62,7 +62,6 @@
     { MP_ROM_QSTR(MP_QSTR_unique_id),           MP_ROM_PTR(&machine_unique_id_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_main),                MP_ROM_PTR(&machine_main_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_rng),                 MP_ROM_PTR(&machine_rng_get_obj) }, \
-    { MP_ROM_QSTR(MP_QSTR_idle),                MP_ROM_PTR(&machine_idle_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_sleep),               MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_lightsleep),          MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_deepsleep),           MP_ROM_PTR(&machine_deepsleep_obj) }, \
@@ -168,11 +167,9 @@ STATIC mp_obj_t machine_main(mp_obj_t main) {
 }
 MP_DEFINE_CONST_FUN_OBJ_1(machine_main_obj, machine_main);
 
-STATIC mp_obj_t machine_idle(void) {
+STATIC void mp_machine_idle(void) {
     __WFI();
-    return mp_const_none;
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
 
 STATIC mp_obj_t machine_lightsleep(void) {
     pyb_sleep_sleep();

ports/esp32/modmachine.c

@@ -58,7 +58,6 @@
     { MP_ROM_QSTR(MP_QSTR_sleep), MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_lightsleep), MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_deepsleep), MP_ROM_PTR(&machine_deepsleep_obj) }, \
-    { MP_ROM_QSTR(MP_QSTR_idle), MP_ROM_PTR(&machine_idle_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_bootloader), MP_ROM_PTR(&machine_bootloader_obj) }, \
     \
     { MP_ROM_QSTR(MP_QSTR_disable_irq), MP_ROM_PTR(&machine_disable_irq_obj) }, \
@@ -283,13 +282,11 @@ STATIC mp_obj_t machine_unique_id(void) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_unique_id_obj, machine_unique_id);
 
-STATIC mp_obj_t machine_idle(void) {
+STATIC void mp_machine_idle(void) {
     MP_THREAD_GIL_EXIT();
     taskYIELD();
     MP_THREAD_GIL_ENTER();
-    return mp_const_none;
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
 
 STATIC mp_obj_t machine_disable_irq(void) {
     uint32_t state = MICROPY_BEGIN_ATOMIC_SECTION();

ports/esp8266/modmachine.c

@@ -45,7 +45,6 @@
     { MP_ROM_QSTR(MP_QSTR_reset), MP_ROM_PTR(&machine_reset_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_reset_cause), MP_ROM_PTR(&machine_reset_cause_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_unique_id), MP_ROM_PTR(&machine_unique_id_obj) }, \
-    { MP_ROM_QSTR(MP_QSTR_idle), MP_ROM_PTR(&machine_idle_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_sleep), MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_lightsleep), MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_deepsleep), MP_ROM_PTR(&machine_deepsleep_obj) }, \
@@ -102,14 +101,10 @@ STATIC mp_obj_t machine_unique_id(void) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_unique_id_obj, machine_unique_id);
 
-STATIC mp_obj_t machine_idle(void) {
-    uint32_t t = mp_hal_ticks_cpu();
+STATIC void mp_machine_idle(void) {
     asm ("waiti 0");
-    t = mp_hal_ticks_cpu() - t;
     ets_event_poll(); // handle any events after possibly a long wait (eg feed WDT)
-    return MP_OBJ_NEW_SMALL_INT(t);
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
 
 STATIC mp_obj_t machine_lightsleep(size_t n_args, const mp_obj_t *args) {
     uint32_t max_us = 0xffffffff;

ports/mimxrt/modmachine.c

@@ -67,7 +67,6 @@
     { MP_ROM_QSTR(MP_QSTR_RTC),                 MP_ROM_PTR(&machine_rtc_type) }, \
     MICROPY_PY_MACHINE_SDCARD_ENTRY \
     \
-    { MP_ROM_QSTR(MP_QSTR_idle),                MP_ROM_PTR(&machine_idle_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_deepsleep),           MP_ROM_PTR(&machine_deepsleep_obj) }, \
     \
     { MP_ROM_QSTR(MP_QSTR_disable_irq),         MP_ROM_PTR(&machine_disable_irq_obj) }, \
@@ -127,11 +126,9 @@ STATIC mp_obj_t machine_freq(void) {
 }
 MP_DEFINE_CONST_FUN_OBJ_0(machine_freq_obj, machine_freq);
 
-STATIC mp_obj_t machine_idle(void) {
+STATIC void mp_machine_idle(void) {
     MICROPY_EVENT_POLL_HOOK;
-    return mp_const_none;
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
 
 STATIC mp_obj_t machine_deepsleep(size_t n_args, const mp_obj_t *args) {
     if (n_args != 0) {

ports/nrf/modules/machine/modmachine.c

@@ -89,7 +89,6 @@
     { MP_ROM_QSTR(MP_QSTR_bootloader),         MP_ROM_PTR(&machine_bootloader_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_enable_irq),         MP_ROM_PTR(&machine_enable_irq_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_disable_irq),        MP_ROM_PTR(&machine_disable_irq_obj) }, \
-    { MP_ROM_QSTR(MP_QSTR_idle),               MP_ROM_PTR(&machine_idle_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_sleep),              MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_lightsleep),         MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_deepsleep),          MP_ROM_PTR(&machine_deepsleep_obj) }, \
@@ -196,11 +195,9 @@ NORETURN mp_obj_t machine_bootloader(size_t n_args, const mp_obj_t *args) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_bootloader_obj, 0, 1, machine_bootloader);
 
-STATIC mp_obj_t machine_idle(void) {
+STATIC void mp_machine_idle(void) {
     MICROPY_EVENT_POLL_HOOK;
-    return mp_const_none;
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
 
 STATIC mp_obj_t machine_lightsleep(void) {
     __WFE();

ports/qemu-arm/modmachine.c

@@ -32,3 +32,7 @@
 
 // This variable is needed for machine.soft_reset(), but the variable is otherwise unused.
 int pyexec_system_exit = 0;
+
+STATIC void mp_machine_idle(void) {
+    // Do nothing.
+}

ports/renesas-ra/modmachine.c

@@ -67,7 +67,6 @@
     { MP_ROM_QSTR(MP_QSTR_reset),               MP_ROM_PTR(&machine_reset_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_bootloader),          MP_ROM_PTR(&machine_bootloader_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_freq),                MP_ROM_PTR(&machine_freq_obj) }, \
-    { MP_ROM_QSTR(MP_QSTR_idle),                MP_ROM_PTR(&machine_idle_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_sleep),               MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_lightsleep),          MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_deepsleep),           MP_ROM_PTR(&machine_deepsleep_obj) }, \
@@ -236,11 +235,9 @@ MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_freq_obj, 0, 4, machine_freq);
 // idle()
 // This executies a wfi machine instruction which reduces power consumption
 // of the MCU until an interrupt occurs, at which point execution continues.
-STATIC mp_obj_t machine_idle(void) {
+STATIC void mp_machine_idle(void) {
     __WFI();
-    return mp_const_none;
 }
-MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
 
 STATIC mp_obj_t machine_lightsleep(size_t n_args, const mp_obj_t *args) {
     if (n_args != 0) {

ports/renesas-ra/modmachine.h

@@ -47,7 +47,6 @@ MP_DECLARE_CONST_FUN_OBJ_0(machine_reset_obj);
 MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(machine_bootloader_obj);
 MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(machine_freq_obj);
 
-MP_DECLARE_CONST_FUN_OBJ_0(machine_idle_obj);
 MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(machine_lightsleep_obj);
 MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(machine_deepsleep_obj);
 

ports/rp2/modmachine.c

@@ -54,7 +54,6 @@
     { MP_ROM_QSTR(MP_QSTR_bootloader),          MP_ROM_PTR(&machine_bootloader_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_freq),                MP_ROM_PTR(&machine_freq_obj) }, \
     \
-    { MP_ROM_QSTR(MP_QSTR_idle),                MP_ROM_PTR(&machine_idle_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_lightsleep),          MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_deepsleep),           MP_ROM_PTR(&machine_deepsleep_obj) }, \
     \
@@ -121,11 +120,9 @@ STATIC mp_obj_t machine_freq(size_t n_args, const mp_obj_t *args) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_freq_obj, 0, 1, machine_freq);
 
-STATIC mp_obj_t machine_idle(void) {
+STATIC void mp_machine_idle(void) {
     __wfe();
-    return mp_const_none;
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
 
 STATIC mp_obj_t machine_lightsleep(size_t n_args, const mp_obj_t *args) {
     mp_int_t delay_ms = 0;

ports/samd/modmachine.c

@@ -64,7 +64,6 @@
     { MP_ROM_QSTR(MP_QSTR_Timer),               MP_ROM_PTR(&machine_timer_type) }, \
     MICROPY_PY_MACHINE_RTC_ENTRY \
     \
-    { MP_ROM_QSTR(MP_QSTR_idle),                MP_ROM_PTR(&machine_idle_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_disable_irq),         MP_ROM_PTR(&machine_disable_irq_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_enable_irq),          MP_ROM_PTR(&machine_enable_irq_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_reset_cause),         MP_ROM_PTR(&machine_reset_cause_obj) }, \
@@ -122,11 +121,9 @@ STATIC mp_obj_t machine_unique_id(void) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_unique_id_obj, machine_unique_id);
 
-STATIC mp_obj_t machine_idle(void) {
+STATIC void mp_machine_idle(void) {
     MICROPY_EVENT_POLL_HOOK;
-    return mp_const_none;
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
 
 STATIC mp_obj_t machine_disable_irq(void) {
     uint32_t state = MICROPY_BEGIN_ATOMIC_SECTION();

ports/stm32/modmachine.c

@@ -102,7 +102,6 @@
     { MP_ROM_QSTR(MP_QSTR_bootloader),          MP_ROM_PTR(&machine_bootloader_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_freq),                MP_ROM_PTR(&machine_freq_obj) }, \
     MICROPY_PY_MACHINE_RNG_ENTRY \
-    { MP_ROM_QSTR(MP_QSTR_idle),                MP_ROM_PTR(&machine_idle_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_sleep),               MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_lightsleep),          MP_ROM_PTR(&machine_lightsleep_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_deepsleep),           MP_ROM_PTR(&machine_deepsleep_obj) }, \
@@ -381,11 +380,9 @@ MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_freq_obj, 0, 4, machine_freq);
 // idle()
 // This executies a wfi machine instruction which reduces power consumption
 // of the MCU until an interrupt occurs, at which point execution continues.
-STATIC mp_obj_t machine_idle(void) {
+STATIC void mp_machine_idle(void) {
     __WFI();
-    return mp_const_none;
 }
-MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
 
 STATIC mp_obj_t machine_lightsleep(size_t n_args, const mp_obj_t *args) {
     if (n_args != 0) {

ports/stm32/modmachine.h

@@ -39,7 +39,6 @@ MP_DECLARE_CONST_FUN_OBJ_0(machine_reset_obj);
 MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(machine_bootloader_obj);
 MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(machine_freq_obj);
 
-MP_DECLARE_CONST_FUN_OBJ_0(machine_idle_obj);
 MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(machine_lightsleep_obj);
 MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(machine_deepsleep_obj);
 MP_DECLARE_CONST_FUN_OBJ_0(machine_reset_cause_obj);

ports/stm32/modpyb.c

@@ -65,6 +65,12 @@ STATIC mp_obj_t pyb_fault_debug(mp_obj_t value) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_fault_debug_obj, pyb_fault_debug);
 
+STATIC mp_obj_t pyb_idle(void) {
+    __WFI();
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_0(pyb_idle_obj, pyb_idle);
+
 #if MICROPY_PY_PYB_LEGACY
 
 // Returns the number of milliseconds which have elapsed since `start`.
@@ -144,7 +150,7 @@ STATIC const mp_rom_map_elem_t pyb_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_repl_info), MP_ROM_PTR(&pyb_set_repl_info_obj) },
     #endif
 
-    { MP_ROM_QSTR(MP_QSTR_wfi), MP_ROM_PTR(&machine_idle_obj) },
+    { MP_ROM_QSTR(MP_QSTR_wfi), MP_ROM_PTR(&pyb_idle_obj) },
     { MP_ROM_QSTR(MP_QSTR_disable_irq), MP_ROM_PTR(&machine_disable_irq_obj) },
     { MP_ROM_QSTR(MP_QSTR_enable_irq), MP_ROM_PTR(&machine_enable_irq_obj) },
     #if IRQ_ENABLE_STATS

ports/unix/modmachine.c

@@ -36,14 +36,7 @@
 #define MICROPY_PAGE_MASK (MICROPY_PAGE_SIZE - 1)
 #endif
 
-#ifdef MICROPY_UNIX_MACHINE_IDLE
-#define MICROPY_PY_MACHINE_IDLE_ENTRY { MP_ROM_QSTR(MP_QSTR_idle), MP_ROM_PTR(&machine_idle_obj) },
-#else
-#define MICROPY_PY_MACHINE_IDLE_ENTRY
-#endif
-
 #define MICROPY_PY_MACHINE_EXTRA_GLOBALS \
-    MICROPY_PY_MACHINE_IDLE_ENTRY \
     { MP_ROM_QSTR(MP_QSTR_PinBase), MP_ROM_PTR(&machine_pinbase_type) }, \
 
 // This variable is needed for machine.soft_reset(), but the variable is otherwise unused.
@@ -80,10 +73,10 @@ uintptr_t mod_machine_mem_get_addr(mp_obj_t addr_o, uint align) {
     return addr;
 }
 
-#ifdef MICROPY_UNIX_MACHINE_IDLE
-STATIC mp_obj_t machine_idle(void) {
+STATIC void mp_machine_idle(void) {
+    #ifdef MICROPY_UNIX_MACHINE_IDLE
     MICROPY_UNIX_MACHINE_IDLE
-    return mp_const_none;
+    #else
+    // Do nothing.
+    #endif
 }
-MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);
-#endif

ports/zephyr/modmachine.c

@@ -43,7 +43,6 @@
 #define MICROPY_PY_MACHINE_EXTRA_GLOBALS \
     MICROPY_PY_MACHINE_RESET_ENTRY \
     { MP_ROM_QSTR(MP_QSTR_reset_cause), MP_ROM_PTR(&machine_reset_cause_obj) }, \
-    { MP_ROM_QSTR(MP_QSTR_idle), MP_ROM_PTR(&machine_idle_obj) }, \
     { MP_ROM_QSTR(MP_QSTR_Pin), MP_ROM_PTR(&machine_pin_type) }, \
 
 STATIC mp_obj_t machine_reset(void) {
@@ -59,8 +58,6 @@ STATIC mp_obj_t machine_reset_cause(void) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_reset_cause_obj, machine_reset_cause);
 
-STATIC mp_obj_t machine_idle(void) {
+STATIC void mp_machine_idle(void) {
     k_yield();
-    return mp_const_none;
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);