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circuitpython/ports/stm/peripherals/timers.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 Lucian Copeland for Adafruit Industries
*
* 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 "timers.h"
#include "py/mpconfig.h"
#include "py/gc.h"
#include "py/obj.h"
#include "py/runtime.h"
#include "supervisor/shared/translate.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "shared-bindings/microcontroller/Pin.h"
#if !(CPY_STM32H7)
#define ALL_CLOCKS 0xFFFF
#define NULL_IRQ 0xFF
static bool stm_timer_reserved[MP_ARRAY_SIZE(mcu_tim_banks)];
static bool stm_timer_never_reset[MP_ARRAY_SIZE(mcu_tim_banks)];
typedef void (*stm_timer_callback_t)(void);
// Array of function pointers.
static stm_timer_callback_t stm_timer_callback[MP_ARRAY_SIZE(mcu_tim_banks)];
static size_t irq_map[] = {
#ifdef TIM1
TIM1_CC_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM2
TIM2_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM3
TIM3_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM4
TIM4_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM5
TIM5_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM6
#if !defined(DAC_BASE) && !defined(DAC1_BASE)
TIM6_IRQn,
#else
TIM6_DAC_IRQn,
#endif
#else
NULL_IRQ,
#endif
#ifdef TIM7
TIM7_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM8
TIM8_CC_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM9
TIM1_BRK_TIM9_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM10
TIM1_UP_TIM10_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM11
TIM1_TRG_COM_TIM11_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM12
TIM8_BRK_TIM12_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM13
TIM8_UP_TIM13_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM14
TIM8_TRG_COM_TIM14_IRQn,
#else
NULL_IRQ,
#endif
#ifdef TIM15
#ifdef STM32L4
TIM1_BRK_TIM15_IRQn,
#else
TIM15_IRQn,
#endif
#else
NULL_IRQ,
#endif
#ifdef TIM16
#ifdef STM32L4
TIM1_UP_TIM16_IRQn,
#else
TIM16_IRQn,
#endif
#else
NULL_IRQ,
#endif
#ifdef TIM17
#ifdef STM32L4
TIM1_TRG_COM_TIM17_IRQn
#else
TIM17_IRQn,
#endif
#else
NULL_IRQ,
#endif
};
// Get the frequency (in Hz) of the source clock for the given timer.
// On STM32F405/407/415/417 there are 2 cases for how the clock freq is set.
// If the APB prescaler is 1, then the timer clock is equal to its respective
// APB clock. Otherwise (APB prescaler > 1) the timer clock is twice its
// respective APB clock. See DM00031020 Rev 4, page 115.
uint32_t stm_peripherals_timer_get_source_freq(TIM_TypeDef *timer) {
size_t tim_id = stm_peripherals_timer_get_index(timer);
uint32_t source, clk_div;
if (tim_id == 1 || (8 <= tim_id && tim_id <= 11)) {
// TIM{1,8,9,10,11} are on APB2
source = HAL_RCC_GetPCLK2Freq();
clk_div = RCC->CFGR & RCC_CFGR_PPRE2;
} else {
// TIM{2,3,4,5,6,7,12,13,14} are on APB1
source = HAL_RCC_GetPCLK1Freq();
clk_div = RCC->CFGR & RCC_CFGR_PPRE1;
}
if (clk_div != 0) {
// APB prescaler for this timer is > 1
source *= 2;
}
return source;
}
size_t stm_peripherals_timer_get_irqnum(TIM_TypeDef *instance) {
size_t tim_id = stm_peripherals_timer_get_index(instance);
return irq_map[tim_id];
}
void timers_reset(void) {
uint16_t never_reset_mask = 0x00;
for (size_t i = 0; i < MP_ARRAY_SIZE(mcu_tim_banks); i++) {
if (!stm_timer_never_reset[i]) {
stm_timer_reserved[i] = false;
} else {
never_reset_mask |= 1 << i;
}
}
tim_clock_disable(ALL_CLOCKS & ~(never_reset_mask));
}
TIM_TypeDef *stm_peripherals_find_timer(void) {
// Check for timers on pins outside the package size
for (size_t i = 0; i < MP_ARRAY_SIZE(mcu_tim_banks); i++) {
bool timer_in_package = false;
// Find each timer instance on the given bank
for (size_t j = 0; j < MP_ARRAY_SIZE(mcu_tim_pin_list); j++) {
// If a pin is claimed, we skip it
if ((mcu_tim_pin_list[j].tim_index == i)
&& (common_hal_mcu_pin_is_free(mcu_tim_pin_list[j].pin) == true)) {
// Search whether any pins in the package array match it
for (size_t k = 0; k < mcu_pin_globals.map.alloc; k++) {
if ((mcu_tim_pin_list[j].pin == (mcu_pin_obj_t *)(mcu_pin_globals.map.table[k].value))) {
timer_in_package = true;
}
}
}
}
// If no results are found, no unclaimed pins with this timer are in this package,
// and it is safe to pick
if (timer_in_package == false && mcu_tim_banks[i] != NULL) {
return mcu_tim_banks[i];
}
}
// TODO: secondary search for timers outside the pins in the board profile
// Work backwards - higher index timers have fewer pin allocations
for (size_t i = (MP_ARRAY_SIZE(mcu_tim_banks) - 1); i >= 0; i--) {
if ((!stm_timer_reserved[i]) && (mcu_tim_banks[i] != NULL)) {
return mcu_tim_banks[i];
}
}
mp_raise_RuntimeError(translate("All timers in use"));
return NULL;
}
void stm_peripherals_timer_preinit(TIM_TypeDef *instance, uint8_t prio, void (*callback)(void)) {
size_t tim_idx = stm_peripherals_timer_get_index(instance);
stm_timer_callback[tim_idx] = callback;
tim_clock_enable(1 << tim_idx);
HAL_NVIC_SetPriority(irq_map[tim_idx], prio, 0);
HAL_NVIC_EnableIRQ(irq_map[tim_idx]);
}
void stm_peripherals_timer_reserve(TIM_TypeDef *instance) {
size_t tim_idx = stm_peripherals_timer_get_index(instance);
stm_timer_reserved[tim_idx] = true;
}
void stm_peripherals_timer_set_callback(void (*callback)(void), TIM_TypeDef *timer) {
stm_timer_callback[stm_peripherals_timer_get_index(timer)] = callback;
}
void stm_peripherals_timer_free(TIM_TypeDef *instance) {
size_t tim_idx = stm_peripherals_timer_get_index(instance);
HAL_NVIC_DisableIRQ(irq_map[tim_idx]);
stm_timer_callback[tim_idx] = NULL;
tim_clock_disable(1 << tim_idx);
stm_timer_reserved[tim_idx] = false;
stm_timer_never_reset[tim_idx] = false;
}
void stm_peripherals_timer_never_reset(TIM_TypeDef *instance) {
size_t tim_idx = stm_peripherals_timer_get_index(instance);
stm_timer_never_reset[tim_idx] = true;
}
void stm_peripherals_timer_reset_ok(TIM_TypeDef *instance) {
size_t tim_idx = stm_peripherals_timer_get_index(instance);
stm_timer_never_reset[tim_idx] = false;
}
bool stm_peripherals_timer_is_never_reset(TIM_TypeDef *instance) {
size_t tim_idx = stm_peripherals_timer_get_index(instance);
return stm_timer_never_reset[tim_idx];
}
bool stm_peripherals_timer_is_reserved(TIM_TypeDef *instance) {
size_t tim_idx = stm_peripherals_timer_get_index(instance);
return stm_timer_reserved[tim_idx];
}
size_t stm_peripherals_timer_get_index(TIM_TypeDef *instance) {
for (size_t i = 0; i < MP_ARRAY_SIZE(mcu_tim_banks); i++) {
if (instance == mcu_tim_banks[i]) {
return i;
}
}
return ~(size_t)0;
}
void tim_clock_enable(uint16_t mask) {
#ifdef TIM1
if (mask & (1 << 0)) {
__HAL_RCC_TIM1_CLK_ENABLE();
}
#endif
#ifdef TIM2
if (mask & (1 << 1)) {
__HAL_RCC_TIM2_CLK_ENABLE();
}
#endif
#ifdef TIM3
if (mask & (1 << 2)) {
__HAL_RCC_TIM3_CLK_ENABLE();
}
#endif
#ifdef TIM4
if (mask & (1 << 3)) {
__HAL_RCC_TIM4_CLK_ENABLE();
}
#endif
#ifdef TIM5
if (mask & (1 << 4)) {
__HAL_RCC_TIM5_CLK_ENABLE();
}
#endif
// 6 and 7 are reserved ADC timers
#ifdef TIM8
if (mask & (1 << 7)) {
__HAL_RCC_TIM8_CLK_ENABLE();
}
#endif
#ifdef TIM9
if (mask & (1 << 8)) {
__HAL_RCC_TIM9_CLK_ENABLE();
}
#endif
#ifdef TIM10
if (mask & (1 << 9)) {
__HAL_RCC_TIM10_CLK_ENABLE();
}
#endif
#ifdef TIM11
if (mask & (1 << 10)) {
__HAL_RCC_TIM11_CLK_ENABLE();
}
#endif
#ifdef TIM12
if (mask & (1 << 11)) {
__HAL_RCC_TIM12_CLK_ENABLE();
}
#endif
#ifdef TIM13
if (mask & (1 << 12)) {
__HAL_RCC_TIM13_CLK_ENABLE();
}
#endif
#ifdef TIM14
if (mask & (1 << 13)) {
__HAL_RCC_TIM14_CLK_ENABLE();
}
#endif
}
void tim_clock_disable(uint16_t mask) {
#ifdef TIM1
if (mask & (1 << 0)) {
__HAL_RCC_TIM1_CLK_DISABLE();
}
#endif
#ifdef TIM2
if (mask & (1 << 1)) {
__HAL_RCC_TIM2_CLK_DISABLE();
}
#endif
#ifdef TIM3
if (mask & (1 << 2)) {
__HAL_RCC_TIM3_CLK_DISABLE();
}
#endif
#ifdef TIM4
if (mask & (1 << 3)) {
__HAL_RCC_TIM4_CLK_DISABLE();
}
#endif
#ifdef TIM5
if (mask & (1 << 4)) {
__HAL_RCC_TIM5_CLK_DISABLE();
}
#endif
// 6 and 7 are reserved ADC timers
#ifdef TIM8
if (mask & (1 << 7)) {
__HAL_RCC_TIM8_CLK_DISABLE();
}
#endif
#ifdef TIM9
if (mask & (1 << 8)) {
__HAL_RCC_TIM9_CLK_DISABLE();
}
#endif
#ifdef TIM10
if (mask & (1 << 9)) {
__HAL_RCC_TIM10_CLK_DISABLE();
}
#endif
#ifdef TIM11
if (mask & (1 << 10)) {
__HAL_RCC_TIM11_CLK_DISABLE();
}
#endif
#ifdef TIM12
if (mask & (1 << 11)) {
__HAL_RCC_TIM12_CLK_DISABLE();
}
#endif
#ifdef TIM13
if (mask & (1 << 12)) {
__HAL_RCC_TIM13_CLK_DISABLE();
}
#endif
#ifdef TIM14
if (mask & (1 << 13)) {
__HAL_RCC_TIM14_CLK_DISABLE();
}
#endif
}
STATIC void callback_router(size_t index) {
if (stm_timer_callback[index - 1]) {
(*stm_timer_callback[index - 1])();
}
}
void TIM1_CC_IRQHandler(void) { // Advanced timer
callback_router(1);
}
void TIM2_IRQHandler(void) {
callback_router(2);
}
void TIM3_IRQHandler(void) {
callback_router(3);
}
void TIM4_IRQHandler(void) {
callback_router(4);
}
void TIM5_IRQHandler(void) {
callback_router(5);
}
void TIM6_DAC_IRQHandler(void) { // Basic timer (DAC)
callback_router(6);
}
void TIM7_IRQHandler(void) { // Basic timer
callback_router(7);
}
void TIM8_CC_IRQHandler(void) { // Advanced timer
callback_router(8);
}
// Advanced timer interrupts are currently unused.
void TIM1_BRK_TIM9_IRQHandler(void) {
callback_router(9);
}
void TIM1_UP_TIM10_IRQHandler(void) {
callback_router(10);
}
void TIM1_TRG_COM_TIM11_IRQHandler(void) {
callback_router(11);
}
void TIM8_BRK_TIM12_IRQHandler(void) {
callback_router(12);
}
void TIM8_UP_TIM13_IRQHandler(void) {
callback_router(13);
}
void TIM8_TRG_COM_TIM14_IRQHandler(void) {
callback_router(14);
}
#if (CPY_STM32H7)
void TIM15_IRQHandler(void) {
callback_router(15);
}
void TIM16_IRQHandler(void) {
callback_router(16);
}
void TIM17_IRQHandler(void) {
callback_router(17);
}
#endif
#endif
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