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Change PWM to not use any memory if analogWrite is never used.

This commit is contained in:
Daniel Fekete 2017-04-17 12:37:05 +02:00
parent 919c3aeba0
commit 2f5bdeaef7
1 changed files with 32 additions and 16 deletions
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48
STM32/cores/arduino/stm32/stm32_PWM.c
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@ -1,6 +1,6 @@
#include "stm32_gpio.h" #include "stm32_gpio.h"
static TIM_HandleTypeDef handle; TIM_HandleTypeDef *handle;
static uint32_t counter; static uint32_t counter;
static uint32_t period; static uint32_t period;
@ -9,6 +9,10 @@ static uint32_t period;
stm32_pwm_disable_callback_func stm32_pwm_disable_callback = NULL; stm32_pwm_disable_callback_func stm32_pwm_disable_callback = NULL;
void (*pwm_callback_func)();
void pwm_callback();
typedef struct { typedef struct {
GPIO_TypeDef *port; GPIO_TypeDef *port;
uint32_t pin_mask; uint32_t pin_mask;
@ -16,27 +20,32 @@ typedef struct {
uint16_t duty_cycle; uint16_t duty_cycle;
} stm32_pwm_type; } stm32_pwm_type;
stm32_pwm_type pwm_config[sizeof(port_pin_list) / sizeof(port_pin_list[0])]; static stm32_pwm_type pwm_config[sizeof(port_pin_list) / sizeof(port_pin_list[0])];
void stm32_pwm_disable(GPIO_TypeDef *port, uint32_t pin); void stm32_pwm_disable(GPIO_TypeDef *port, uint32_t pin);
void analogWrite(uint8_t pin, int value) { void analogWrite(uint8_t pin, int value) {
if (handle.Instance == NULL) { static TIM_HandleTypeDef staticHandle;
if (handle == NULL) {
handle = &staticHandle;
pwm_callback_func = &pwm_callback;
stm32_pwm_disable_callback = &stm32_pwm_disable; stm32_pwm_disable_callback = &stm32_pwm_disable;
__HAL_RCC_TIM2_CLK_ENABLE(); __HAL_RCC_TIM2_CLK_ENABLE();
HAL_NVIC_SetPriority(TIM2_IRQn, 0, 0); HAL_NVIC_SetPriority(TIM2_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM2_IRQn); HAL_NVIC_EnableIRQ(TIM2_IRQn);
handle.Instance = TIM2; handle->Instance = TIM2;
handle.Init.Prescaler = 999; handle->Init.Prescaler = 999;
handle.Init.CounterMode = TIM_COUNTERMODE_UP; handle->Init.CounterMode = TIM_COUNTERMODE_UP;
period = 256; period = 256;
handle.Init.Period = period; handle->Init.Period = period;
handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; handle->Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&handle); HAL_TIM_Base_Init(handle);
HAL_TIM_Base_Start_IT(&handle); HAL_TIM_Base_Start_IT(handle);
} }
for(int i=0; i<sizeof(pwm_config) / sizeof(pwm_config[0]); i++) { for(int i=0; i<sizeof(pwm_config) / sizeof(pwm_config[0]); i++) {
@ -80,11 +89,7 @@ void stm32_pwm_disable(GPIO_TypeDef *port, uint32_t pin_mask) {
} }
} }
extern void TIM2_IRQHandler(void) { void pwm_callback() {
HAL_TIM_IRQHandler(&handle);
}
extern void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
counter += period; counter += period;
period = 256; period = 256;
@ -105,5 +110,16 @@ extern void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
if (!period) { if (!period) {
period = 256; period = 256;
} }
__HAL_TIM_SET_AUTORELOAD(&handle, period); __HAL_TIM_SET_AUTORELOAD(handle, period);
}
extern void TIM2_IRQHandler(void) {
HAL_TIM_IRQHandler(handle);
}
extern void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
if (pwm_callback_func != NULL) {
(*pwm_callback_func)();
}
} }