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/* Megumin LED display firmware
* Copyright (C) 2018 Sebastian Götte <code@jaseg.net>
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "global.h"
#include "math.h"
#include "color.h"
static struct hsvf g_color_s = {0.0f, 0.0f, 0.0f};
struct hsvf *g_color = &g_color_s;
volatile uint64_t g_time_ms = 0;
uint64_t wait_until(uint64_t timestamp);
bool check_interval(uint64_t *timestamp, uint64_t interval);
void blink_led(uint64_t *ts, int t_on, int t_off, GPIO_TypeDef *gpio, int pin);
void update_timers(struct rgbf *rgb);
uint32_t pcg32_random_r() {
// *Really* minimal PCG32 code / (c) 2014 M.E. O'Neill / pcg-random.org
// Licensed under Apache License 2.0 (NO WARRANTY, etc. see website)
static uint64_t state = 0xbc422715d3aef60f;
static uint64_t inc = 0x6605e3bc6d1a869b;
uint64_t oldstate = state;
// Advance internal state
state = oldstate * 6364136223846793005ULL + (inc|1);
// Calculate output function (XSH RR), uses old state for max ILP
uint32_t xorshifted = ((oldstate >> 18u) ^ oldstate) >> 27u;
uint32_t rot = oldstate >> 59u;
return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
}
int main(void){
/* We're starting out from HSI@8MHz */
SystemCoreClockUpdate();
SysTick_Config(SystemCoreClock / 1000); /* 1ms tick */
/* Turn on lots of neat things */
RCC->APB2ENR |= RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_AFIOEN | RCC_APB2ENR_TIM1EN;
RCC->APB1ENR |= RCC_APB1ENR_TIM3EN | RCC_APB1ENR_TIM4EN;
GPIOC->CRH |=
(0<<GPIO_CRH_CNF13_Pos) | (2<<GPIO_CRH_MODE13_Pos); /* PC13 - LED */
GPIOB->CRL |=
(2<<GPIO_CRL_CNF5_Pos) | (2<<GPIO_CRL_MODE5_Pos); /* PB5 - TIM3_CH2 (r fractional) */
AFIO->MAPR |= (2 << AFIO_MAPR_TIM3_REMAP_Pos); /* Map TIM3_CH2 to PB5 */
GPIOB->CRH |=
(2<<GPIO_CRH_CNF8_Pos) | (2<<GPIO_CRH_MODE8_Pos) /* PB8 - TIM4_CH3 (g fractional) */
| (2<<GPIO_CRH_CNF9_Pos) | (2<<GPIO_CRH_MODE9_Pos); /* PB9 - TIM4_CH4 (b fractional) */
GPIOC->ODR |= 1<<13; /* LED */
GPIOA->CRH = (2<<GPIO_CRH_CNF8_Pos) | (2<<GPIO_CRH_MODE8_Pos); /* PA8 - TIM1_CH1 (global dimming) */
TIM3->SMCR = (3<<TIM_SMCR_TS_Pos) | (4 << TIM_SMCR_SMS_Pos);
TIM4->CR2 = (4<<TIM_CR2_MMS_Pos);
TIM3->CCER = TIM_CCER_CC2E;
TIM3->CCMR1 = (0<<TIM_CCMR1_CC2S_Pos) | TIM_CCMR1_OC2PE | (6<<TIM_CCMR1_OC2M_Pos);
TIM4->CCER = TIM_CCER_CC3E | TIM_CCER_CC4E | TIM_CCER_CC1E | TIM_CCER_CC3P | TIM_CCER_CC4P;
TIM4->CCMR1 = (0<<TIM_CCMR1_CC1S_Pos) | TIM_CCMR1_OC1PE | (7<<TIM_CCMR1_OC1M_Pos);
TIM4->CCMR2 = (0<<TIM_CCMR2_CC4S_Pos) | TIM_CCMR2_OC4PE | (6<<TIM_CCMR2_OC4M_Pos) \
| (0<<TIM_CCMR2_CC3S_Pos) | TIM_CCMR2_OC3PE | (7<<TIM_CCMR2_OC3M_Pos);
TIM3->CR1 = TIM_CR1_ARPE | TIM_CR1_CEN;
TIM4->CR1 = TIM_CR1_ARPE | TIM_CR1_CEN;
TIM4->CR1 = TIM_CR1_ARPE | TIM_CR1_CEN;
TIM1->CCMR1 = (0<<TIM_CCMR1_CC1S_Pos) | TIM_CCMR1_OC1PE | (6<<TIM_CCMR1_OC1M_Pos);
TIM1->SMCR = (3 << TIM_SMCR_TS_Pos) | (4 << TIM_SMCR_SMS_Pos);
TIM1->CCER = TIM_CCER_CC1E;
TIM1->ARR = 0xffff;
TIM1->BDTR = TIM_BDTR_MOE;
TIM1->CR1 = TIM_CR1_ARPE | TIM_CR1_CEN;
uint64_t ts = g_time_ms;
uint64_t led_ts = 0;
for (;;) {
g_color->h = fmodf(g_color->h + 0.0005, 1.0f);
//g_color->h = 0.0;
g_color->s = 0.8;
g_color->v = 1.0;
struct rgbf rgb;
hsv_to_rgb(g_color, &rgb);
update_timers(&rgb);
ts = wait_until(ts + 5);
blink_led(&led_ts, 100, 200, GPIOC, 13);
}
}
void update_timers(struct rgbf *rgb) {
float gamma = 2.2f;
rgb->r = powf(rgb->r, gamma);
rgb->g = powf(rgb->g, gamma);
rgb->b = powf(rgb->b, gamma);
float total = rgb->r + rgb->g + rgb->b;
rgb->r /= total;
rgb->g /= total;
rgb->b /= total;
float period = 0xffff;
int thr[2] = {roundf(period * rgb->r), roundf(period * (rgb->r + rgb->g))};
TIM4->CCR3 = thr[0];
TIM4->CCR4 = thr[1];
TIM4->CCR1 = thr[0];
TIM3->CCR2 = thr[1] - thr[0];
TIM3->ARR = period;
TIM4->ARR = period;
TIM1->CCR1 = roundf((period - 1) * total / 3.0f);
}
void gdb_dump(void) {
/* debugger hook */
}
void NMI_Handler(void) {
asm volatile ("bkpt");
}
void HardFault_Handler(void) __attribute__((naked));
void HardFault_Handler() {
asm volatile ("bkpt");
}
void SVC_Handler(void) {
asm volatile ("bkpt");
}
void PendSV_Handler(void) {
asm volatile ("bkpt");
}
void SysTick_Handler(void) {
g_time_ms ++;
}
uint64_t wait_until(uint64_t timestamp) {
while (g_time_ms < timestamp)
;
return g_time_ms;
}
bool check_interval(uint64_t *timestamp, uint64_t interval) {
if (*timestamp == 0) {
*timestamp = g_time_ms;
return false;
}
if (g_time_ms < *timestamp + interval)
return false;
*timestamp = g_time_ms;
return true;
}
void blink_led(uint64_t *ts, int t_on, int t_off, GPIO_TypeDef *gpio, int pin) {
int bm = 1<<pin;
if (gpio->ODR & bm) {
if (check_interval(ts, t_off))
gpio->BRR = bm;
} else {
if (check_interval(ts, t_on))
gpio->BSRR = bm;
}
}
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