4241ad24a3
* Signal Generator app * MCO pin initialization in app * furi_hal_pwm documentation Co-authored-by: あく <alleteam@gmail.com>
139 lines
4.3 KiB
C
139 lines
4.3 KiB
C
#include "furi_hal_pwm.h"
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#include <core/check.h>
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#include <furi_hal_resources.h>
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#include <stdint.h>
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#include <stm32wbxx_ll_tim.h>
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#include <stm32wbxx_ll_lptim.h>
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#include <stm32wbxx_ll_rcc.h>
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#include <furi.h>
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const uint32_t lptim_psc_table[] = {
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LL_LPTIM_PRESCALER_DIV1,
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LL_LPTIM_PRESCALER_DIV2,
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LL_LPTIM_PRESCALER_DIV4,
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LL_LPTIM_PRESCALER_DIV8,
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LL_LPTIM_PRESCALER_DIV16,
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LL_LPTIM_PRESCALER_DIV32,
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LL_LPTIM_PRESCALER_DIV64,
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LL_LPTIM_PRESCALER_DIV128,
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};
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void furi_hal_pwm_start(FuriHalPwmOutputId channel, uint32_t freq, uint8_t duty) {
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if(channel == FuriHalPwmOutputIdTim1PA7) {
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furi_hal_gpio_init_ex(
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&gpio_ext_pa7,
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GpioModeAltFunctionPushPull,
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GpioPullNo,
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GpioSpeedVeryHigh,
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GpioAltFn1TIM1);
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FURI_CRITICAL_ENTER();
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LL_TIM_DeInit(TIM1);
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FURI_CRITICAL_EXIT();
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LL_TIM_SetCounterMode(TIM1, LL_TIM_COUNTERMODE_UP);
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LL_TIM_SetRepetitionCounter(TIM1, 0);
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LL_TIM_SetClockDivision(TIM1, LL_TIM_CLOCKDIVISION_DIV1);
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LL_TIM_SetClockSource(TIM1, LL_TIM_CLOCKSOURCE_INTERNAL);
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LL_TIM_EnableARRPreload(TIM1);
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LL_TIM_OC_EnablePreload(TIM1, LL_TIM_CHANNEL_CH1);
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LL_TIM_OC_SetMode(TIM1, LL_TIM_CHANNEL_CH1, LL_TIM_OCMODE_PWM1);
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LL_TIM_OC_SetPolarity(TIM1, LL_TIM_CHANNEL_CH1N, LL_TIM_OCPOLARITY_HIGH);
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LL_TIM_OC_DisableFast(TIM1, LL_TIM_CHANNEL_CH1);
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LL_TIM_CC_EnableChannel(TIM1, LL_TIM_CHANNEL_CH1N);
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LL_TIM_EnableAllOutputs(TIM1);
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furi_hal_pwm_set_params(channel, freq, duty);
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LL_TIM_EnableCounter(TIM1);
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} else if(channel == FuriHalPwmOutputIdLptim2PA4) {
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furi_hal_gpio_init_ex(
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&gpio_ext_pa4,
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GpioModeAltFunctionPushPull,
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GpioPullNo,
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GpioSpeedVeryHigh,
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GpioAltFn14LPTIM2);
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FURI_CRITICAL_ENTER();
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LL_LPTIM_DeInit(LPTIM2);
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FURI_CRITICAL_EXIT();
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LL_LPTIM_SetUpdateMode(LPTIM2, LL_LPTIM_UPDATE_MODE_ENDOFPERIOD);
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LL_RCC_SetLPTIMClockSource(LL_RCC_LPTIM2_CLKSOURCE_PCLK1);
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LL_LPTIM_SetClockSource(LPTIM2, LL_LPTIM_CLK_SOURCE_INTERNAL);
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LL_LPTIM_ConfigOutput(
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LPTIM2, LL_LPTIM_OUTPUT_WAVEFORM_PWM, LL_LPTIM_OUTPUT_POLARITY_INVERSE);
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LL_LPTIM_SetCounterMode(LPTIM2, LL_LPTIM_COUNTER_MODE_INTERNAL);
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LL_LPTIM_Enable(LPTIM2);
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furi_hal_pwm_set_params(channel, freq, duty);
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LL_LPTIM_StartCounter(LPTIM2, LL_LPTIM_OPERATING_MODE_CONTINUOUS);
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}
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}
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void furi_hal_pwm_stop(FuriHalPwmOutputId channel) {
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if(channel == FuriHalPwmOutputIdTim1PA7) {
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furi_hal_gpio_init_simple(&gpio_ext_pa7, GpioModeAnalog);
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FURI_CRITICAL_ENTER();
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LL_TIM_DeInit(TIM1);
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FURI_CRITICAL_EXIT();
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} else if(channel == FuriHalPwmOutputIdLptim2PA4) {
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furi_hal_gpio_init_simple(&gpio_ext_pa4, GpioModeAnalog);
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FURI_CRITICAL_ENTER();
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LL_LPTIM_DeInit(LPTIM2);
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FURI_CRITICAL_EXIT();
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}
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}
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void furi_hal_pwm_set_params(FuriHalPwmOutputId channel, uint32_t freq, uint8_t duty) {
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furi_assert(freq > 0);
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uint32_t freq_div = 64000000LU / freq;
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if(channel == FuriHalPwmOutputIdTim1PA7) {
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uint32_t prescaler = freq_div / 0x10000LU;
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uint32_t period = freq_div / (prescaler + 1);
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uint32_t compare = period * duty / 100;
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LL_TIM_SetPrescaler(TIM1, prescaler);
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LL_TIM_SetAutoReload(TIM1, period - 1);
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LL_TIM_OC_SetCompareCH1(TIM1, compare);
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} else if(channel == FuriHalPwmOutputIdLptim2PA4) {
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uint32_t prescaler = 0;
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uint32_t period = 0;
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bool clock_lse = false;
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do {
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period = freq_div / (1 << prescaler);
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if(period <= 0xFFFF) {
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break;
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}
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prescaler++;
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if(prescaler > 7) {
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prescaler = 0;
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clock_lse = true;
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period = 32768LU / freq;
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break;
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}
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} while(1);
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uint32_t compare = period * duty / 100;
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LL_LPTIM_SetPrescaler(LPTIM2, lptim_psc_table[prescaler]);
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LL_LPTIM_SetAutoReload(LPTIM2, period);
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LL_LPTIM_SetCompare(LPTIM2, compare);
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if(clock_lse) {
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LL_RCC_SetLPTIMClockSource(LL_RCC_LPTIM2_CLKSOURCE_LSE);
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} else {
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LL_RCC_SetLPTIMClockSource(LL_RCC_LPTIM2_CLKSOURCE_PCLK1);
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}
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}
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}
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