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atbetaflight/src/main/drivers/timer_hal.c

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/*
* This file is part of Cleanflight.
*
* Cleanflight is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Cleanflight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Cleanflight. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
#include "platform.h"
#include "build/atomic.h"
#include "common/utils.h"
#include "drivers/nvic.h"
#include "drivers/io.h"
#include "rcc.h"
#include "timer.h"
#include "timer_impl.h"
#define TIM_N(n) (1 << (n))
/*
Groups that allow running different period (ex 50Hz servos + 400Hz throttle + etc):
TIM1 2 channels
TIM2 4 channels
TIM3 4 channels
TIM4 4 channels
*/
/// TODO: HAL in a lot af calls lookupTimerIndex is used. Instead of passing the timer instance the index should be passed.
#define USED_TIMER_COUNT BITCOUNT(USED_TIMERS)
#define CC_CHANNELS_PER_TIMER 4 // TIM_Channel_1..4
#define TIM_IT_CCx(ch) (TIM_IT_CC1 << ((ch) / 4))
typedef struct timerConfig_s {
timerCCHandlerRec_t *edgeCallback[CC_CHANNELS_PER_TIMER];
timerOvrHandlerRec_t *overflowCallback[CC_CHANNELS_PER_TIMER];
timerOvrHandlerRec_t *overflowCallbackActive; // null-terminated linkded list of active overflow callbacks
uint32_t forcedOverflowTimerValue;
} timerConfig_t;
timerConfig_t timerConfig[USED_TIMER_COUNT+1];
typedef struct {
channelType_t type;
} timerChannelInfo_t;
timerChannelInfo_t timerChannelInfo[USABLE_TIMER_CHANNEL_COUNT];
typedef struct {
uint8_t priority;
} timerInfo_t;
timerInfo_t timerInfo[USED_TIMER_COUNT+1];
typedef struct
{
TIM_HandleTypeDef Handle;
} timerHandle_t;
timerHandle_t timerHandle[USED_TIMER_COUNT+1];
// return index of timer in timer table. Lowest timer has index 0
#define TIMER_INDEX(i) BITCOUNT((TIM_N(i) - 1) & USED_TIMERS)
static uint8_t lookupTimerIndex(const TIM_TypeDef *tim)
{
#define _CASE_SHF 10 // amount we can safely shift timer address to the right. gcc will throw error if some timers overlap
#define _CASE_(tim, index) case ((unsigned)tim >> _CASE_SHF): return index; break
#define _CASE(i) _CASE_(TIM##i##_BASE, TIMER_INDEX(i))
// let gcc do the work, switch should be quite optimized
switch ((unsigned)tim >> _CASE_SHF) {
#if USED_TIMERS & TIM_N(1)
_CASE(1);
#endif
#if USED_TIMERS & TIM_N(2)
_CASE(2);
#endif
#if USED_TIMERS & TIM_N(3)
_CASE(3);
#endif
#if USED_TIMERS & TIM_N(4)
_CASE(4);
#endif
#if USED_TIMERS & TIM_N(5)
_CASE(5);
#endif
#if USED_TIMERS & TIM_N(6)
_CASE(6);
#endif
#if USED_TIMERS & TIM_N(7)
_CASE(7);
#endif
#if USED_TIMERS & TIM_N(8)
_CASE(8);
#endif
#if USED_TIMERS & TIM_N(9)
_CASE(9);
#endif
#if USED_TIMERS & TIM_N(10)
_CASE(10);
#endif
#if USED_TIMERS & TIM_N(11)
_CASE(11);
#endif
#if USED_TIMERS & TIM_N(12)
_CASE(12);
#endif
#if USED_TIMERS & TIM_N(13)
_CASE(13);
#endif
#if USED_TIMERS & TIM_N(14)
_CASE(14);
#endif
#if USED_TIMERS & TIM_N(15)
_CASE(15);
#endif
#if USED_TIMERS & TIM_N(16)
_CASE(16);
#endif
#if USED_TIMERS & TIM_N(17)
_CASE(17);
#endif
default: return ~1; // make sure final index is out of range
}
#undef _CASE
#undef _CASE_
}
TIM_TypeDef * const usedTimers[USED_TIMER_COUNT] = {
#define _DEF(i) TIM##i
#if USED_TIMERS & TIM_N(1)
_DEF(1),
#endif
#if USED_TIMERS & TIM_N(2)
_DEF(2),
#endif
#if USED_TIMERS & TIM_N(3)
_DEF(3),
#endif
#if USED_TIMERS & TIM_N(4)
_DEF(4),
#endif
#if USED_TIMERS & TIM_N(5)
_DEF(5),
#endif
#if USED_TIMERS & TIM_N(6)
_DEF(6),
#endif
#if USED_TIMERS & TIM_N(7)
_DEF(7),
#endif
#if USED_TIMERS & TIM_N(8)
_DEF(8),
#endif
#if USED_TIMERS & TIM_N(9)
_DEF(9),
#endif
#if USED_TIMERS & TIM_N(10)
_DEF(10),
#endif
#if USED_TIMERS & TIM_N(11)
_DEF(11),
#endif
#if USED_TIMERS & TIM_N(12)
_DEF(12),
#endif
#if USED_TIMERS & TIM_N(13)
_DEF(13),
#endif
#if USED_TIMERS & TIM_N(14)
_DEF(14),
#endif
#if USED_TIMERS & TIM_N(15)
_DEF(15),
#endif
#if USED_TIMERS & TIM_N(16)
_DEF(16),
#endif
#if USED_TIMERS & TIM_N(17)
_DEF(17),
#endif
#undef _DEF
};
static inline uint8_t lookupChannelIndex(const uint16_t channel)
{
return channel >> 2;
}
rccPeriphTag_t timerRCC(TIM_TypeDef *tim)
{
for (int i = 0; i < HARDWARE_TIMER_DEFINITION_COUNT; i++) {
if (timerDefinitions[i].TIMx == tim) {
return timerDefinitions[i].rcc;
}
}
return 0;
}
uint8_t timerInputIrq(TIM_TypeDef *tim)
{
for (int i = 0; i < HARDWARE_TIMER_DEFINITION_COUNT; i++) {
if (timerDefinitions[i].TIMx == tim) {
return timerDefinitions[i].inputIrq;
}
}
return 0;
}
void timerNVICConfigure(uint8_t irq)
{
HAL_NVIC_SetPriority(irq, NVIC_PRIORITY_BASE(NVIC_PRIO_TIMER), NVIC_PRIORITY_SUB(NVIC_PRIO_TIMER));
HAL_NVIC_EnableIRQ(irq);
}
TIM_HandleTypeDef* timerFindTimerHandle(TIM_TypeDef *tim)
{
uint8_t timerIndex = lookupTimerIndex(tim);
if (timerIndex >= USED_TIMER_COUNT)
return NULL;
return &timerHandle[timerIndex].Handle;
}
void configTimeBase(TIM_TypeDef *tim, uint16_t period, uint32_t hz)
{
uint8_t timerIndex = lookupTimerIndex(tim);
if (timerIndex >= USED_TIMER_COUNT) {
return;
}
if (timerHandle[timerIndex].Handle.Instance == tim)
{
// already configured
return;
}
timerHandle[timerIndex].Handle.Instance = tim;
timerHandle[timerIndex].Handle.Init.Period = (period - 1) & 0xffff; // AKA TIMx_ARR
timerHandle[timerIndex].Handle.Init.Prescaler = (timerClock(tim) / hz) - 1;
timerHandle[timerIndex].Handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
timerHandle[timerIndex].Handle.Init.CounterMode = TIM_COUNTERMODE_UP;
timerHandle[timerIndex].Handle.Init.RepetitionCounter = 0x0000;
HAL_TIM_Base_Init(&timerHandle[timerIndex].Handle);
if (tim == TIM1 || tim == TIM2 || tim == TIM3 || tim == TIM4 || tim == TIM5 || tim == TIM8 || tim == TIM9)
{
TIM_ClockConfigTypeDef sClockSourceConfig;
memset(&sClockSourceConfig, 0, sizeof(sClockSourceConfig));
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&timerHandle[timerIndex].Handle, &sClockSourceConfig) != HAL_OK)
{
return;
}
}
if (tim == TIM1 || tim == TIM2 || tim == TIM3 || tim == TIM4 || tim == TIM5 || tim == TIM8 )
{
TIM_MasterConfigTypeDef sMasterConfig;
memset(&sMasterConfig, 0, sizeof(sMasterConfig));
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&timerHandle[timerIndex].Handle, &sMasterConfig) != HAL_OK)
{
return;
}
}
}
// old interface for PWM inputs. It should be replaced
void timerConfigure(const timerHardware_t *timerHardwarePtr, uint16_t period, uint32_t hz)
{
uint8_t timerIndex = lookupTimerIndex(timerHardwarePtr->tim);
if (timerIndex >= USED_TIMER_COUNT) {
return;
}
configTimeBase(timerHardwarePtr->tim, period, hz);
HAL_TIM_Base_Start(&timerHandle[timerIndex].Handle);
uint8_t irq = timerInputIrq(timerHardwarePtr->tim);
timerNVICConfigure(irq);
// HACK - enable second IRQ on timers that need it
switch (irq) {
case TIM1_CC_IRQn:
timerNVICConfigure(TIM1_UP_TIM10_IRQn);
break;
case TIM8_CC_IRQn:
timerNVICConfigure(TIM8_UP_TIM13_IRQn);
break;
}
}
// allocate and configure timer channel. Timer priority is set to highest priority of its channels
void timerChInit(const timerHardware_t *timHw, channelType_t type, int irqPriority, uint8_t irq)
{
uint8_t timerIndex = lookupTimerIndex(timHw->tim);
if (timerIndex >= USED_TIMER_COUNT) {
return;
}
unsigned channel = timHw - timerHardware;
if (channel >= USABLE_TIMER_CHANNEL_COUNT)
return;
timerChannelInfo[channel].type = type;
unsigned timer = lookupTimerIndex(timHw->tim);
if (timer >= USED_TIMER_COUNT)
return;
if (irqPriority < timerInfo[timer].priority) {
// it would be better to set priority in the end, but current startup sequence is not ready
configTimeBase(usedTimers[timer], 0, 1);
HAL_TIM_Base_Start(&timerHandle[timerIndex].Handle);
HAL_NVIC_SetPriority(irq, NVIC_PRIORITY_BASE(irqPriority), NVIC_PRIORITY_SUB(irqPriority));
HAL_NVIC_EnableIRQ(irq);
timerInfo[timer].priority = irqPriority;
}
}
void timerChCCHandlerInit(timerCCHandlerRec_t *self, timerCCHandlerCallback *fn)
{
self->fn = fn;
}
void timerChOvrHandlerInit(timerOvrHandlerRec_t *self, timerOvrHandlerCallback *fn)
{
self->fn = fn;
self->next = NULL;
}
// update overflow callback list
// some synchronization mechanism is neccesary to avoid disturbing other channels (BASEPRI used now)
static void timerChConfig_UpdateOverflow(timerConfig_t *cfg, TIM_TypeDef *tim) {
uint8_t timerIndex = lookupTimerIndex(tim);
if (timerIndex >= USED_TIMER_COUNT) {
return;
}
timerOvrHandlerRec_t **chain = &cfg->overflowCallbackActive;
ATOMIC_BLOCK(NVIC_PRIO_TIMER) {
for (int i = 0; i < CC_CHANNELS_PER_TIMER; i++)
if (cfg->overflowCallback[i]) {
*chain = cfg->overflowCallback[i];
chain = &cfg->overflowCallback[i]->next;
}
*chain = NULL;
}
// enable or disable IRQ
if (cfg->overflowCallbackActive)
__HAL_TIM_ENABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_UPDATE);
else
__HAL_TIM_DISABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_UPDATE);
}
// config edge and overflow callback for channel. Try to avoid overflowCallback, it is a bit expensive
void timerChConfigCallbacks(const timerHardware_t *timHw, timerCCHandlerRec_t *edgeCallback, timerOvrHandlerRec_t *overflowCallback)
{
uint8_t timerIndex = lookupTimerIndex(timHw->tim);
if (timerIndex >= USED_TIMER_COUNT) {
return;
}
uint8_t channelIndex = lookupChannelIndex(timHw->channel);
if (edgeCallback == NULL) // disable irq before changing callback to NULL
__HAL_TIM_DISABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_CCx(timHw->channel));
// setup callback info
timerConfig[timerIndex].edgeCallback[channelIndex] = edgeCallback;
timerConfig[timerIndex].overflowCallback[channelIndex] = overflowCallback;
// enable channel IRQ
if (edgeCallback)
__HAL_TIM_ENABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_CCx(timHw->channel));
timerChConfig_UpdateOverflow(&timerConfig[timerIndex], timHw->tim);
}
// configure callbacks for pair of channels (1+2 or 3+4).
// Hi(2,4) and Lo(1,3) callbacks are specified, it is not important which timHw channel is used.
// This is intended for dual capture mode (each channel handles one transition)
void timerChConfigCallbacksDual(const timerHardware_t *timHw, timerCCHandlerRec_t *edgeCallbackLo, timerCCHandlerRec_t *edgeCallbackHi, timerOvrHandlerRec_t *overflowCallback)
{
uint8_t timerIndex = lookupTimerIndex(timHw->tim);
if (timerIndex >= USED_TIMER_COUNT) {
return;
}
uint16_t chLo = timHw->channel & ~TIM_CHANNEL_2; // lower channel
uint16_t chHi = timHw->channel | TIM_CHANNEL_2; // upper channel
uint8_t channelIndex = lookupChannelIndex(chLo); // get index of lower channel
if (edgeCallbackLo == NULL) // disable irq before changing setting callback to NULL
__HAL_TIM_DISABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_CCx(chLo));
if (edgeCallbackHi == NULL) // disable irq before changing setting callback to NULL
__HAL_TIM_DISABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_CCx(chHi));
// setup callback info
timerConfig[timerIndex].edgeCallback[channelIndex] = edgeCallbackLo;
timerConfig[timerIndex].edgeCallback[channelIndex + 1] = edgeCallbackHi;
timerConfig[timerIndex].overflowCallback[channelIndex] = overflowCallback;
timerConfig[timerIndex].overflowCallback[channelIndex + 1] = NULL;
// enable channel IRQs
if (edgeCallbackLo) {
__HAL_TIM_CLEAR_FLAG(&timerHandle[timerIndex].Handle, TIM_IT_CCx(chLo));
__HAL_TIM_ENABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_CCx(chLo));
}
if (edgeCallbackHi) {
__HAL_TIM_CLEAR_FLAG(&timerHandle[timerIndex].Handle, TIM_IT_CCx(chHi));
__HAL_TIM_ENABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_CCx(chHi));
}
timerChConfig_UpdateOverflow(&timerConfig[timerIndex], timHw->tim);
}
// enable/disable IRQ for low channel in dual configuration
//void timerChITConfigDualLo(const timerHardware_t *timHw, FunctionalState newState) {
// TIM_ITConfig(timHw->tim, TIM_IT_CCx(timHw->channel&~TIM_Channel_2), newState);
//}
// enable/disable IRQ for low channel in dual configuration
void timerChITConfigDualLo(const timerHardware_t *timHw, FunctionalState newState) {
uint8_t timerIndex = lookupTimerIndex(timHw->tim);
if (timerIndex >= USED_TIMER_COUNT) {
return;
}
if (newState)
__HAL_TIM_ENABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_CCx(timHw->channel&~TIM_CHANNEL_2));
else
__HAL_TIM_DISABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_CCx(timHw->channel&~TIM_CHANNEL_2));
}
//// enable or disable IRQ
//void timerChITConfig(const timerHardware_t *timHw, FunctionalState newState)
//{
// TIM_ITConfig(timHw->tim, TIM_IT_CCx(timHw->channel), newState);
//}
// enable or disable IRQ
void timerChITConfig(const timerHardware_t *timHw, FunctionalState newState)
{
uint8_t timerIndex = lookupTimerIndex(timHw->tim);
if (timerIndex >= USED_TIMER_COUNT) {
return;
}
if (newState)
__HAL_TIM_ENABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_CCx(timHw->channel));
else
__HAL_TIM_DISABLE_IT(&timerHandle[timerIndex].Handle, TIM_IT_CCx(timHw->channel));
}
// clear Compare/Capture flag for channel
//void timerChClearCCFlag(const timerHardware_t *timHw)
//{
// TIM_ClearFlag(timHw->tim, TIM_IT_CCx(timHw->channel));
//}
// clear Compare/Capture flag for channel
void timerChClearCCFlag(const timerHardware_t *timHw)
{
uint8_t timerIndex = lookupTimerIndex(timHw->tim);
if (timerIndex >= USED_TIMER_COUNT) {
return;
}
__HAL_TIM_CLEAR_FLAG(&timerHandle[timerIndex].Handle, TIM_IT_CCx(timHw->channel));
}
// configure timer channel GPIO mode
void timerChConfigGPIO(const timerHardware_t* timHw, ioConfig_t mode)
{
IOInit(IOGetByTag(timHw->tag), OWNER_TIMER, 0);
IOConfigGPIO(IOGetByTag(timHw->tag), mode);
}
// calculate input filter constant
// TODO - we should probably setup DTS to higher value to allow reasonable input filtering
// - notice that prescaler[0] does use DTS for sampling - the sequence won't be monotonous anymore
static unsigned getFilter(unsigned ticks)
{
static const unsigned ftab[16] = {
1*1, // fDTS !
1*2, 1*4, 1*8, // fCK_INT
2*6, 2*8, // fDTS/2
4*6, 4*8,
8*6, 8*8,
16*5, 16*6, 16*8,
32*5, 32*6, 32*8
};
for (unsigned i = 1; i < ARRAYLEN(ftab); i++)
if (ftab[i] > ticks)
return i - 1;
return 0x0f;
}
// Configure input captupre
void timerChConfigIC(const timerHardware_t *timHw, bool polarityRising, unsigned inputFilterTicks)
{
unsigned timer = lookupTimerIndex(timHw->tim);
if (timer >= USED_TIMER_COUNT)
return;
TIM_IC_InitTypeDef TIM_ICInitStructure;
TIM_ICInitStructure.ICPolarity = polarityRising ? TIM_ICPOLARITY_RISING : TIM_ICPOLARITY_FALLING;
TIM_ICInitStructure.ICSelection = TIM_ICSELECTION_DIRECTTI;
TIM_ICInitStructure.ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.ICFilter = getFilter(inputFilterTicks);
HAL_TIM_IC_ConfigChannel(&timerHandle[timer].Handle,&TIM_ICInitStructure, timHw->channel);
}
// configure dual channel input channel for capture
// polarity is for Low channel (capture order is always Lo - Hi)
void timerChConfigICDual(const timerHardware_t *timHw, bool polarityRising, unsigned inputFilterTicks)
{
unsigned timer = lookupTimerIndex(timHw->tim);
if (timer >= USED_TIMER_COUNT)
return;
TIM_IC_InitTypeDef TIM_ICInitStructure;
bool directRising = (timHw->channel & TIM_CHANNEL_2) ? !polarityRising : polarityRising;
// configure direct channel
TIM_ICInitStructure.ICPolarity = directRising ? TIM_ICPOLARITY_RISING : TIM_ICPOLARITY_FALLING;
TIM_ICInitStructure.ICSelection = TIM_ICSELECTION_DIRECTTI;
TIM_ICInitStructure.ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.ICFilter = getFilter(inputFilterTicks);
HAL_TIM_IC_ConfigChannel(&timerHandle[timer].Handle,&TIM_ICInitStructure, timHw->channel);
// configure indirect channel
TIM_ICInitStructure.ICPolarity = directRising ? TIM_ICPOLARITY_FALLING : TIM_ICPOLARITY_RISING;
TIM_ICInitStructure.ICSelection = TIM_ICSELECTION_INDIRECTTI;
HAL_TIM_IC_ConfigChannel(&timerHandle[timer].Handle,&TIM_ICInitStructure, timHw->channel ^ TIM_CHANNEL_2);
}
void timerChICPolarity(const timerHardware_t *timHw, bool polarityRising)
{
timCCER_t tmpccer = timHw->tim->CCER;
tmpccer &= ~(TIM_CCER_CC1P << timHw->channel);
tmpccer |= polarityRising ? (TIM_ICPOLARITY_RISING << timHw->channel) : (TIM_ICPOLARITY_FALLING << timHw->channel);
timHw->tim->CCER = tmpccer;
}
volatile timCCR_t* timerChCCRHi(const timerHardware_t *timHw)
{
return (volatile timCCR_t*)((volatile char*)&timHw->tim->CCR1 + (timHw->channel | TIM_CHANNEL_2));
}
volatile timCCR_t* timerChCCRLo(const timerHardware_t *timHw)
{
return (volatile timCCR_t*)((volatile char*)&timHw->tim->CCR1 + (timHw->channel & ~TIM_CHANNEL_2));
}
volatile timCCR_t* timerChCCR(const timerHardware_t *timHw)
{
return (volatile timCCR_t*)((volatile char*)&timHw->tim->CCR1 + timHw->channel);
}
void timerChConfigOC(const timerHardware_t* timHw, bool outEnable, bool stateHigh)
{
unsigned timer = lookupTimerIndex(timHw->tim);
if (timer >= USED_TIMER_COUNT)
return;
TIM_OC_InitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.OCMode = TIM_OCMODE_INACTIVE;
TIM_OCInitStructure.Pulse = 0x00000000;
TIM_OCInitStructure.OCPolarity = stateHigh ? TIM_OCPOLARITY_HIGH : TIM_OCPOLARITY_LOW;
TIM_OCInitStructure.OCNPolarity = TIM_OCPOLARITY_HIGH;
TIM_OCInitStructure.OCIdleState = TIM_OCIDLESTATE_RESET;
TIM_OCInitStructure.OCNIdleState = TIM_OCNIDLESTATE_RESET;
HAL_TIM_OC_ConfigChannel(&timerHandle[timer].Handle, &TIM_OCInitStructure, timHw->channel);
if (outEnable) {
TIM_OCInitStructure.OCMode = TIM_OCMODE_INACTIVE;
HAL_TIM_OC_ConfigChannel(&timerHandle[timer].Handle, &TIM_OCInitStructure, timHw->channel);
HAL_TIM_OC_Start(&timerHandle[timer].Handle, timHw->channel);
} else {
TIM_OCInitStructure.OCMode = TIM_OCMODE_TIMING;
HAL_TIM_OC_ConfigChannel(&timerHandle[timer].Handle, &TIM_OCInitStructure, timHw->channel);
HAL_TIM_OC_Start_IT(&timerHandle[timer].Handle, timHw->channel);
}
}
static void timCCxHandler(TIM_TypeDef *tim, timerConfig_t *timerConfig)
{
uint16_t capture;
unsigned tim_status;
tim_status = tim->SR & tim->DIER;
#if 1
while (tim_status) {
// flags will be cleared by reading CCR in dual capture, make sure we call handler correctly
// currrent order is highest bit first. Code should not rely on specific order (it will introduce race conditions anyway)
unsigned bit = __builtin_clz(tim_status);
unsigned mask = ~(0x80000000 >> bit);
tim->SR = mask;
tim_status &= mask;
switch (bit) {
case __builtin_clz(TIM_IT_UPDATE): {
if (timerConfig->forcedOverflowTimerValue != 0) {
capture = timerConfig->forcedOverflowTimerValue - 1;
timerConfig->forcedOverflowTimerValue = 0;
} else {
capture = tim->ARR;
}
timerOvrHandlerRec_t *cb = timerConfig->overflowCallbackActive;
while (cb) {
cb->fn(cb, capture);
cb = cb->next;
}
break;
}
case __builtin_clz(TIM_IT_CC1):
timerConfig->edgeCallback[0]->fn(timerConfig->edgeCallback[0], tim->CCR1);
break;
case __builtin_clz(TIM_IT_CC2):
timerConfig->edgeCallback[1]->fn(timerConfig->edgeCallback[1], tim->CCR2);
break;
case __builtin_clz(TIM_IT_CC3):
timerConfig->edgeCallback[2]->fn(timerConfig->edgeCallback[2], tim->CCR3);
break;
case __builtin_clz(TIM_IT_CC4):
timerConfig->edgeCallback[3]->fn(timerConfig->edgeCallback[3], tim->CCR4);
break;
}
}
#else
if (tim_status & (int)TIM_IT_Update) {
tim->SR = ~TIM_IT_Update;
capture = tim->ARR;
timerOvrHandlerRec_t *cb = timerConfig->overflowCallbackActive;
while (cb) {
cb->fn(cb, capture);
cb = cb->next;
}
}
if (tim_status & (int)TIM_IT_CC1) {
tim->SR = ~TIM_IT_CC1;
timerConfig->edgeCallback[0]->fn(timerConfig->edgeCallback[0], tim->CCR1);
}
if (tim_status & (int)TIM_IT_CC2) {
tim->SR = ~TIM_IT_CC2;
timerConfig->edgeCallback[1]->fn(timerConfig->edgeCallback[1], tim->CCR2);
}
if (tim_status & (int)TIM_IT_CC3) {
tim->SR = ~TIM_IT_CC3;
timerConfig->edgeCallback[2]->fn(timerConfig->edgeCallback[2], tim->CCR3);
}
if (tim_status & (int)TIM_IT_CC4) {
tim->SR = ~TIM_IT_CC4;
timerConfig->edgeCallback[3]->fn(timerConfig->edgeCallback[3], tim->CCR4);
}
#endif
}
// handler for shared interrupts when both timers need to check status bits
#define _TIM_IRQ_HANDLER2(name, i, j) \
void name(void) \
{ \
timCCxHandler(TIM ## i, &timerConfig[TIMER_INDEX(i)]); \
timCCxHandler(TIM ## j, &timerConfig[TIMER_INDEX(j)]); \
} struct dummy
#define _TIM_IRQ_HANDLER(name, i) \
void name(void) \
{ \
timCCxHandler(TIM ## i, &timerConfig[TIMER_INDEX(i)]); \
} struct dummy
#if USED_TIMERS & TIM_N(1)
_TIM_IRQ_HANDLER(TIM1_CC_IRQHandler, 1);
# if USED_TIMERS & TIM_N(10)
_TIM_IRQ_HANDLER2(TIM1_UP_TIM10_IRQHandler, 1, 10); // both timers are in use
# else
_TIM_IRQ_HANDLER(TIM1_UP_TIM10_IRQHandler, 1); // timer10 is not used
# endif
#endif
#if USED_TIMERS & TIM_N(2)
_TIM_IRQ_HANDLER(TIM2_IRQHandler, 2);
#endif
#if USED_TIMERS & TIM_N(3)
_TIM_IRQ_HANDLER(TIM3_IRQHandler, 3);
#endif
#if USED_TIMERS & TIM_N(4)
_TIM_IRQ_HANDLER(TIM4_IRQHandler, 4);
#endif
#if USED_TIMERS & TIM_N(5)
_TIM_IRQ_HANDLER(TIM5_IRQHandler, 5);
#endif
#if USED_TIMERS & TIM_N(8)
_TIM_IRQ_HANDLER(TIM8_CC_IRQHandler, 8);
# if USED_TIMERS & TIM_N(13)
_TIM_IRQ_HANDLER2(TIM8_UP_TIM13_IRQHandler, 8, 13); // both timers are in use
# else
_TIM_IRQ_HANDLER(TIM8_UP_TIM13_IRQHandler, 8); // timer13 is not used
# endif
#endif
#if USED_TIMERS & TIM_N(9)
_TIM_IRQ_HANDLER(TIM1_BRK_TIM9_IRQHandler, 9);
#endif
# if USED_TIMERS & TIM_N(11)
_TIM_IRQ_HANDLER(TIM1_TRG_COM_TIM11_IRQHandler, 11);
# endif
#if USED_TIMERS & TIM_N(12)
_TIM_IRQ_HANDLER(TIM8_BRK_TIM12_IRQHandler, 12);
#endif
#if USED_TIMERS & TIM_N(15)
_TIM_IRQ_HANDLER(TIM1_BRK_TIM15_IRQHandler, 15);
#endif
#if defined(STM32F303xC) && ((USED_TIMERS & (TIM_N(1)|TIM_N(16))) == (TIM_N(16)))
_TIM_IRQ_HANDLER(TIM1_UP_TIM16_IRQHandler, 16); // only timer16 is used, not timer1
#endif
#if USED_TIMERS & TIM_N(17)
_TIM_IRQ_HANDLER(TIM1_TRG_COM_TIM17_IRQHandler, 17);
#endif
void timerInit(void)
{
memset(timerConfig, 0, sizeof (timerConfig));
#if USED_TIMERS & TIM_N(1)
__HAL_RCC_TIM1_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(2)
__HAL_RCC_TIM2_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(3)
__HAL_RCC_TIM3_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(4)
__HAL_RCC_TIM4_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(5)
__HAL_RCC_TIM5_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(6)
__HAL_RCC_TIM6_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(7)
__HAL_RCC_TIM7_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(8)
__HAL_RCC_TIM8_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(9)
__HAL_RCC_TIM9_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(10)
__HAL_RCC_TIM10_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(11)
__HAL_RCC_TIM11_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(12)
__HAL_RCC_TIM12_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(13)
__HAL_RCC_TIM13_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(14)
__HAL_RCC_TIM14_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(15)
__HAL_RCC_TIM15_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(16)
__HAL_RCC_TIM16_CLK_ENABLE();
#endif
#if USED_TIMERS & TIM_N(17)
__HAL_RCC_TIM17_CLK_ENABLE();
#endif
/* enable the timer peripherals */
for (int i = 0; i < USABLE_TIMER_CHANNEL_COUNT; i++) {
RCC_ClockCmd(timerRCC(timerHardware[i].tim), ENABLE);
}
#if defined(STM32F3) || defined(STM32F4) || defined(STM32F7)
for (int timerIndex = 0; timerIndex < USABLE_TIMER_CHANNEL_COUNT; timerIndex++) {
const timerHardware_t *timerHardwarePtr = &timerHardware[timerIndex];
IOConfigGPIOAF(IOGetByTag(timerHardwarePtr->tag), IOCFG_AF_PP, timerHardwarePtr->alternateFunction);
}
#endif
// initialize timer channel structures
for (int i = 0; i < USABLE_TIMER_CHANNEL_COUNT; i++) {
timerChannelInfo[i].type = TYPE_FREE;
}
for (int i = 0; i < USED_TIMER_COUNT; i++) {
timerInfo[i].priority = ~0;
}
}
// finish configuring timers after allocation phase
// start timers
// TODO - Work in progress - initialization routine must be modified/verified to start correctly without timers
void timerStart(void)
{
#if 0
for (unsigned timer = 0; timer < USED_TIMER_COUNT; timer++) {
int priority = -1;
int irq = -1;
for (unsigned hwc = 0; hwc < USABLE_TIMER_CHANNEL_COUNT; hwc++)
if ((timerChannelInfo[hwc].type != TYPE_FREE) && (timerHardware[hwc].tim == usedTimers[timer])) {
// TODO - move IRQ to timer info
irq = timerHardware[hwc].irq;
}
// TODO - aggregate required timer paramaters
configTimeBase(usedTimers[timer], 0, 1);
TIM_Cmd(usedTimers[timer], ENABLE);
if (priority >= 0) { // maybe none of the channels was configured
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = irq;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = NVIC_SPLIT_PRIORITY_BASE(priority);
NVIC_InitStructure.NVIC_IRQChannelSubPriority = NVIC_SPLIT_PRIORITY_SUB(priority);
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
}
#endif
}
/**
* Force an overflow for a given timer.
* Saves the current value of the counter in the relevant timerConfig's forcedOverflowTimerValue variable.
* @param TIM_Typedef *tim The timer to overflow
* @return void
**/
void timerForceOverflow(TIM_TypeDef *tim)
{
uint8_t timerIndex = lookupTimerIndex((const TIM_TypeDef *)tim);
ATOMIC_BLOCK(NVIC_PRIO_TIMER) {
// Save the current count so that PPM reading will work on the same timer that was forced to overflow
timerConfig[timerIndex].forcedOverflowTimerValue = tim->CNT + 1;
// Force an overflow by setting the UG bit
tim->EGR |= TIM_EGR_UG;
}
}
const timerHardware_t *timerGetByTag(ioTag_t tag, timerUsageFlag_e flag)
{
for (int i = 0; i < USABLE_TIMER_CHANNEL_COUNT; i++) {
if (timerHardware[i].tag == tag) {
if (timerHardware[i].usageFlags & flag || flag == 0) {
return &timerHardware[i];
}
}
}
return NULL;
}
uint16_t timerDmaSource(uint8_t channel)
{
switch (channel) {
case TIM_CHANNEL_1:
return TIM_DMA_ID_CC1;
case TIM_CHANNEL_2:
return TIM_DMA_ID_CC2;
case TIM_CHANNEL_3:
return TIM_DMA_ID_CC3;
case TIM_CHANNEL_4:
return TIM_DMA_ID_CC4;
}
return 0;
}
uint16_t timerGetPrescalerByDesiredMhz(TIM_TypeDef *tim, uint16_t mhz)
{
return timerGetPrescalerByDesiredHertz(tim, MHZ_TO_HZ(mhz));
}
uint16_t timerGetPeriodByPrescaler(TIM_TypeDef *tim, uint16_t prescaler, uint32_t hz)
{
return ((uint16_t)((timerClock(tim) / (prescaler + 1)) / hz));
}
uint16_t timerGetPrescalerByDesiredHertz(TIM_TypeDef *tim, uint32_t hz)
{
// protection here for desired hertz > SystemCoreClock???
if (hz > timerClock(tim)) {
return 0;
}
return (uint16_t)((timerClock(tim) + hz / 2 ) / hz) - 1;
}
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