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circuitpython/ports/stm32/modmachine.c
Damien George 48b25a841b stm32: Add machine.Timer with soft timer implementation. 
This commit adds an implementation of machine.Timer backed by the soft
timer mechanism.  It allows an arbitrary number of timers with 1ms
resolution, with an associated Python callback.  The Python-level API
matches existing ports that have a soft timer, and is used as:

    from machine import Timer
    t = Timer(freq=10, callback=lambda t:print(t))
    ...
    t = Timer(mode=Timer.ONE_SHOT, period=2000, callback=lambda t:print(t))
    ...
    t.deinit()
2019-10-31 22:12:55 +11:00

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013-2015 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include "modmachine.h"
#include "py/gc.h"
#include "py/runtime.h"
#include "py/objstr.h"
#include "py/mperrno.h"
#include "py/mphal.h"
#include "extmod/machine_mem.h"
#include "extmod/machine_signal.h"
#include "extmod/machine_pulse.h"
#include "extmod/machine_i2c.h"
#include "lib/utils/pyexec.h"
#include "lib/oofatfs/ff.h"
#include "extmod/vfs.h"
#include "extmod/vfs_fat.h"
#include "gccollect.h"
#include "irq.h"
#include "powerctrl.h"
#include "pybthread.h"
#include "rng.h"
#include "storage.h"
#include "pin.h"
#include "timer.h"
#include "usb.h"
#include "rtc.h"
#include "i2c.h"
#include "spi.h"
#include "uart.h"
#include "wdt.h"
#if defined(STM32L0)
// L0 does not have a BOR, so use POR instead
#define RCC_CSR_BORRSTF RCC_CSR_PORRSTF
#endif
#if defined(STM32L4) || defined(STM32WB)
// L4 does not have a POR, so use BOR instead
#define RCC_CSR_PORRSTF RCC_CSR_BORRSTF
#endif
#if defined(STM32H7)
#define RCC_SR RSR
#define RCC_SR_IWDGRSTF RCC_RSR_IWDG1RSTF
#define RCC_SR_WWDGRSTF RCC_RSR_WWDG1RSTF
#define RCC_SR_PORRSTF RCC_RSR_PORRSTF
#define RCC_SR_BORRSTF RCC_RSR_BORRSTF
#define RCC_SR_PINRSTF RCC_RSR_PINRSTF
#define RCC_SR_RMVF RCC_RSR_RMVF
#else
#define RCC_SR CSR
#define RCC_SR_IWDGRSTF RCC_CSR_IWDGRSTF
#define RCC_SR_WWDGRSTF RCC_CSR_WWDGRSTF
#define RCC_SR_PORRSTF RCC_CSR_PORRSTF
#define RCC_SR_BORRSTF RCC_CSR_BORRSTF
#define RCC_SR_PINRSTF RCC_CSR_PINRSTF
#define RCC_SR_RMVF RCC_CSR_RMVF
#endif
#define PYB_RESET_SOFT (0)
#define PYB_RESET_POWER_ON (1)
#define PYB_RESET_HARD (2)
#define PYB_RESET_WDT (3)
#define PYB_RESET_DEEPSLEEP (4)
STATIC uint32_t reset_cause;
void machine_init(void) {
#if defined(STM32F4)
if (PWR->CSR & PWR_CSR_SBF) {
// came out of standby
reset_cause = PYB_RESET_DEEPSLEEP;
PWR->CR |= PWR_CR_CSBF;
} else
#elif defined(STM32F7)
if (PWR->CSR1 & PWR_CSR1_SBF) {
// came out of standby
reset_cause = PYB_RESET_DEEPSLEEP;
PWR->CR1 |= PWR_CR1_CSBF;
} else
#elif defined(STM32H7)
if (PWR->CPUCR & PWR_CPUCR_SBF || PWR->CPUCR & PWR_CPUCR_STOPF) {
// came out of standby or stop mode
reset_cause = PYB_RESET_DEEPSLEEP;
PWR->CPUCR |= PWR_CPUCR_CSSF;
} else
#elif defined(STM32L4)
if (PWR->SR1 & PWR_SR1_SBF) {
// came out of standby
reset_cause = PYB_RESET_DEEPSLEEP;
PWR->SCR |= PWR_SCR_CSBF;
} else
#endif
{
// get reset cause from RCC flags
uint32_t state = RCC->RCC_SR;
if (state & RCC_SR_IWDGRSTF || state & RCC_SR_WWDGRSTF) {
reset_cause = PYB_RESET_WDT;
} else if (state & RCC_SR_PORRSTF
#if !defined(STM32F0)
|| state & RCC_SR_BORRSTF
#endif
) {
reset_cause = PYB_RESET_POWER_ON;
} else if (state & RCC_SR_PINRSTF) {
reset_cause = PYB_RESET_HARD;
} else {
// default is soft reset
reset_cause = PYB_RESET_SOFT;
}
}
// clear RCC reset flags
RCC->RCC_SR |= RCC_SR_RMVF;
}
void machine_deinit(void) {
// we are doing a soft-reset so change the reset_cause
reset_cause = PYB_RESET_SOFT;
}
// machine.info([dump_alloc_table])
// Print out lots of information about the board.
STATIC mp_obj_t machine_info(size_t n_args, const mp_obj_t *args) {
// get and print unique id; 96 bits
{
byte *id = (byte*)MP_HAL_UNIQUE_ID_ADDRESS;
printf("ID=%02x%02x%02x%02x:%02x%02x%02x%02x:%02x%02x%02x%02x\n", id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7], id[8], id[9], id[10], id[11]);
}
// get and print clock speeds
// SYSCLK=168MHz, HCLK=168MHz, PCLK1=42MHz, PCLK2=84MHz
{
#if defined(STM32F0)
printf("S=%u\nH=%u\nP1=%u\n",
(unsigned int)HAL_RCC_GetSysClockFreq(),
(unsigned int)HAL_RCC_GetHCLKFreq(),
(unsigned int)HAL_RCC_GetPCLK1Freq());
#else
printf("S=%u\nH=%u\nP1=%u\nP2=%u\n",
(unsigned int)HAL_RCC_GetSysClockFreq(),
(unsigned int)HAL_RCC_GetHCLKFreq(),
(unsigned int)HAL_RCC_GetPCLK1Freq(),
(unsigned int)HAL_RCC_GetPCLK2Freq());
#endif
}
// to print info about memory
{
printf("_etext=%p\n", &_etext);
printf("_sidata=%p\n", &_sidata);
printf("_sdata=%p\n", &_sdata);
printf("_edata=%p\n", &_edata);
printf("_sbss=%p\n", &_sbss);
printf("_ebss=%p\n", &_ebss);
printf("_sstack=%p\n", &_sstack);
printf("_estack=%p\n", &_estack);
printf("_ram_start=%p\n", &_ram_start);
printf("_heap_start=%p\n", &_heap_start);
printf("_heap_end=%p\n", &_heap_end);
printf("_ram_end=%p\n", &_ram_end);
}
// qstr info
{
size_t n_pool, n_qstr, n_str_data_bytes, n_total_bytes;
qstr_pool_info(&n_pool, &n_qstr, &n_str_data_bytes, &n_total_bytes);
printf("qstr:\n n_pool=%u\n n_qstr=%u\n n_str_data_bytes=%u\n n_total_bytes=%u\n", n_pool, n_qstr, n_str_data_bytes, n_total_bytes);
}
// GC info
{
gc_info_t info;
gc_info(&info);
printf("GC:\n");
printf(" %u total\n", info.total);
printf(" %u : %u\n", info.used, info.free);
printf(" 1=%u 2=%u m=%u\n", info.num_1block, info.num_2block, info.max_block);
}
// free space on flash
{
#if MICROPY_VFS_FAT
for (mp_vfs_mount_t *vfs = MP_STATE_VM(vfs_mount_table); vfs != NULL; vfs = vfs->next) {
if (strncmp("/flash", vfs->str, vfs->len) == 0) {
// assumes that it's a FatFs filesystem
fs_user_mount_t *vfs_fat = MP_OBJ_TO_PTR(vfs->obj);
DWORD nclst;
f_getfree(&vfs_fat->fatfs, &nclst);
printf("LFS free: %u bytes\n", (uint)(nclst * vfs_fat->fatfs.csize * 512));
break;
}
}
#endif
}
#if MICROPY_PY_THREAD
pyb_thread_dump();
#endif
if (n_args == 1) {
// arg given means dump gc allocation table
gc_dump_alloc_table();
}
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_info_obj, 0, 1, machine_info);
// Returns a string of 12 bytes (96 bits), which is the unique ID for the MCU.
STATIC mp_obj_t machine_unique_id(void) {
byte *id = (byte*)MP_HAL_UNIQUE_ID_ADDRESS;
return mp_obj_new_bytes(id, 12);
}
MP_DEFINE_CONST_FUN_OBJ_0(machine_unique_id_obj, machine_unique_id);
// Resets the pyboard in a manner similar to pushing the external RESET button.
STATIC mp_obj_t machine_reset(void) {
powerctrl_mcu_reset();
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_0(machine_reset_obj, machine_reset);
STATIC mp_obj_t machine_soft_reset(void) {
pyexec_system_exit = PYEXEC_FORCED_EXIT;
nlr_raise(mp_obj_new_exception(&mp_type_SystemExit));
}
MP_DEFINE_CONST_FUN_OBJ_0(machine_soft_reset_obj, machine_soft_reset);
// Activate the bootloader without BOOT* pins.
STATIC NORETURN mp_obj_t machine_bootloader(size_t n_args, const mp_obj_t *args) {
#if MICROPY_HW_ENABLE_USB
pyb_usb_dev_deinit();
#endif
#if MICROPY_HW_ENABLE_STORAGE
storage_flush();
#endif
__disable_irq();
#if MICROPY_HW_USES_BOOTLOADER
if (n_args == 0 || !mp_obj_is_true(args[0])) {
// By default, with no args given, we enter the custom bootloader (mboot)
powerctrl_enter_bootloader(0x70ad0000, 0x08000000);
}
if (n_args == 1 && mp_obj_is_str_or_bytes(args[0])) {
// With a string/bytes given, pass its data to the custom bootloader
size_t len;
const char *data = mp_obj_str_get_data(args[0], &len);
void *mboot_region = (void*)*((volatile uint32_t*)0x08000000);
memmove(mboot_region, data, len);
powerctrl_enter_bootloader(0x70ad0080, 0x08000000);
}
#endif
#if defined(STM32F7) || defined(STM32H7)
powerctrl_enter_bootloader(0, 0x1ff00000);
#else
powerctrl_enter_bootloader(0, 0x00000000);
#endif
while (1);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_bootloader_obj, 0, 1, machine_bootloader);
// get or set the MCU frequencies
STATIC mp_obj_t machine_freq(size_t n_args, const mp_obj_t *args) {
if (n_args == 0) {
// get
mp_obj_t tuple[] = {
mp_obj_new_int(HAL_RCC_GetSysClockFreq()),
mp_obj_new_int(HAL_RCC_GetHCLKFreq()),
mp_obj_new_int(HAL_RCC_GetPCLK1Freq()),
#if !defined(STM32F0)
mp_obj_new_int(HAL_RCC_GetPCLK2Freq()),
#endif
};
return mp_obj_new_tuple(MP_ARRAY_SIZE(tuple), tuple);
} else {
// set
#if defined(STM32F0) || defined(STM32L0) || defined(STM32L4) || defined(STM32WB)
mp_raise_NotImplementedError("machine.freq set not supported yet");
#else
mp_int_t sysclk = mp_obj_get_int(args[0]);
mp_int_t ahb = sysclk;
mp_int_t apb1 = ahb / 4;
mp_int_t apb2 = ahb / 2;
if (n_args > 1) {
ahb = mp_obj_get_int(args[1]);
if (n_args > 2) {
apb1 = mp_obj_get_int(args[2]);
if (n_args > 3) {
apb2 = mp_obj_get_int(args[3]);
}
}
}
int ret = powerctrl_set_sysclk(sysclk, ahb, apb1, apb2);
if (ret == -MP_EINVAL) {
mp_raise_ValueError("invalid freq");
} else if (ret < 0) {
void NORETURN __fatal_error(const char *msg);
__fatal_error("can't change freq");
}
return mp_const_none;
#endif
}
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_freq_obj, 0, 4, machine_freq);
STATIC mp_obj_t machine_lightsleep(size_t n_args, const mp_obj_t *args) {
if (n_args != 0) {
mp_obj_t args2[2] = {MP_OBJ_NULL, args[0]};
pyb_rtc_wakeup(2, args2);
}
powerctrl_enter_stop_mode();
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_lightsleep_obj, 0, 1, machine_lightsleep);
STATIC mp_obj_t machine_deepsleep(size_t n_args, const mp_obj_t *args) {
if (n_args != 0) {
mp_obj_t args2[2] = {MP_OBJ_NULL, args[0]};
pyb_rtc_wakeup(2, args2);
}
powerctrl_enter_standby_mode();
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_deepsleep_obj, 0, 1, machine_deepsleep);
STATIC mp_obj_t machine_reset_cause(void) {
return MP_OBJ_NEW_SMALL_INT(reset_cause);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_reset_cause_obj, machine_reset_cause);
STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_umachine) },
{ MP_ROM_QSTR(MP_QSTR_info), MP_ROM_PTR(&machine_info_obj) },
{ MP_ROM_QSTR(MP_QSTR_unique_id), MP_ROM_PTR(&machine_unique_id_obj) },
{ MP_ROM_QSTR(MP_QSTR_reset), MP_ROM_PTR(&machine_reset_obj) },
{ MP_ROM_QSTR(MP_QSTR_soft_reset), MP_ROM_PTR(&machine_soft_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) },
#if MICROPY_HW_ENABLE_RNG
{ MP_ROM_QSTR(MP_QSTR_rng), MP_ROM_PTR(&pyb_rng_get_obj) },
#endif
{ MP_ROM_QSTR(MP_QSTR_idle), MP_ROM_PTR(&pyb_wfi_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) },
{ MP_ROM_QSTR(MP_QSTR_reset_cause), MP_ROM_PTR(&machine_reset_cause_obj) },
#if 0
{ MP_ROM_QSTR(MP_QSTR_wake_reason), MP_ROM_PTR(&machine_wake_reason_obj) },
#endif
{ MP_ROM_QSTR(MP_QSTR_disable_irq), MP_ROM_PTR(&pyb_disable_irq_obj) },
{ MP_ROM_QSTR(MP_QSTR_enable_irq), MP_ROM_PTR(&pyb_enable_irq_obj) },
{ MP_ROM_QSTR(MP_QSTR_time_pulse_us), MP_ROM_PTR(&machine_time_pulse_us_obj) },
{ MP_ROM_QSTR(MP_QSTR_mem8), MP_ROM_PTR(&machine_mem8_obj) },
{ MP_ROM_QSTR(MP_QSTR_mem16), MP_ROM_PTR(&machine_mem16_obj) },
{ MP_ROM_QSTR(MP_QSTR_mem32), MP_ROM_PTR(&machine_mem32_obj) },
{ MP_ROM_QSTR(MP_QSTR_Pin), MP_ROM_PTR(&pin_type) },
{ MP_ROM_QSTR(MP_QSTR_Signal), MP_ROM_PTR(&machine_signal_type) },
{ MP_ROM_QSTR(MP_QSTR_RTC), MP_ROM_PTR(&pyb_rtc_type) },
{ MP_ROM_QSTR(MP_QSTR_ADC), MP_ROM_PTR(&machine_adc_type) },
#if MICROPY_PY_MACHINE_I2C
{ MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&machine_i2c_type) },
#endif
{ MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&machine_hard_spi_type) },
{ MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&pyb_uart_type) },
{ MP_ROM_QSTR(MP_QSTR_WDT), MP_ROM_PTR(&pyb_wdt_type) },
{ MP_ROM_QSTR(MP_QSTR_Timer), MP_ROM_PTR(&machine_timer_type) },
#if 0
{ MP_ROM_QSTR(MP_QSTR_HeartBeat), MP_ROM_PTR(&pyb_heartbeat_type) },
{ MP_ROM_QSTR(MP_QSTR_SD), MP_ROM_PTR(&pyb_sd_type) },
// class constants
{ MP_ROM_QSTR(MP_QSTR_IDLE), MP_ROM_INT(PYB_PWR_MODE_ACTIVE) },
{ MP_ROM_QSTR(MP_QSTR_SLEEP), MP_ROM_INT(PYB_PWR_MODE_LPDS) },
{ MP_ROM_QSTR(MP_QSTR_DEEPSLEEP), MP_ROM_INT(PYB_PWR_MODE_HIBERNATE) },
#endif
{ MP_ROM_QSTR(MP_QSTR_PWRON_RESET), MP_ROM_INT(PYB_RESET_POWER_ON) },
{ MP_ROM_QSTR(MP_QSTR_HARD_RESET), MP_ROM_INT(PYB_RESET_HARD) },
{ MP_ROM_QSTR(MP_QSTR_WDT_RESET), MP_ROM_INT(PYB_RESET_WDT) },
{ MP_ROM_QSTR(MP_QSTR_DEEPSLEEP_RESET), MP_ROM_INT(PYB_RESET_DEEPSLEEP) },
{ MP_ROM_QSTR(MP_QSTR_SOFT_RESET), MP_ROM_INT(PYB_RESET_SOFT) },
#if 0
{ MP_ROM_QSTR(MP_QSTR_WLAN_WAKE), MP_ROM_INT(PYB_SLP_WAKED_BY_WLAN) },
{ MP_ROM_QSTR(MP_QSTR_PIN_WAKE), MP_ROM_INT(PYB_SLP_WAKED_BY_GPIO) },
{ MP_ROM_QSTR(MP_QSTR_RTC_WAKE), MP_ROM_INT(PYB_SLP_WAKED_BY_RTC) },
#endif
};
STATIC MP_DEFINE_CONST_DICT(machine_module_globals, machine_module_globals_table);
const mp_obj_module_t machine_module = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t*)&machine_module_globals,
};
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