From 93d15fc549f5cd8b5dcef4268de6db2176e6ee5d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Mario=20H=C3=BCttel?= Date: Mon, 10 May 2021 18:44:56 +0200 Subject: [PATCH] Add overtemperature shutdown --- firmware/main.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) diff --git a/firmware/main.c b/firmware/main.c index e162d74..1acd80d 100644 --- a/firmware/main.c +++ b/firmware/main.c @@ -4,6 +4,7 @@ #include #define RING_MAX_LED 32u +#define MAX_TEMP_CELSIUS 70 enum ring_modes { RING_MODE_ALL, /*!< control all LEDs at once */ @@ -63,30 +64,37 @@ int main(void) TIM3->PSC = 0; TIM3->CR1 = TIM_CR1_CEN; - /*! -# init TIM14 for PWM control of the magic LED driver */ - /*! -# count up to 255 (0 bit resolution) */ + /*! -# Init TIM14 for PWM control of the magic LED driver */ + /*! -# Count up to 255 (8 bit resolution) */ TIM14->ARR = 0x00FFu; TIM14->CNT = 0u; TIM14->CCR1 = 0u; - /*! -# set prescaler to 16 ==> ca. 11 KHz */ + /*! -# Set prescaler to 16 ==> ca. 11 KHz */ TIM14->PSC = 15u; /*! -# PWM Mode 1 + prefetch */ TIM14->CCMR1 = TIM_CCMR1_OC1M_2 | TIM_CCMR1_OC1M_1 | TIM_CCMR1_OC1PE; - /*! -# enable Output compare 1 */ + /*! -# Enable Output compare 1 */ TIM14->CCER = TIM_CCER_CC1E; - /*! -# finally enable TIM14 */ + /*! -# Finally, enable TIM14 */ TIM14->CR2 = 0; TIM14->CR1 = TIM_CR1_CEN; - /*! -# set initial state to all 25% */ + /*! -# Set initial state to all 25% */ led_val = 64u; - mode = RING_MODE_ALL; + mode = RING_MODE_WHITE_DISCRETE; temperature_adc_init(); SysTick_Config(800000); while(1) { temperature = temperature_adc_get_temp(); + + /*! -# Gradually dim down the LED brightness in case the temperature is too high */ + if (temperature > ((MAX_TEMP_CELSIUS) * 10)) { + if (led_val > 20) + led_val--; + } + led_pwm_val = 0u; switch (mode) {