254 lines
6.2 KiB
C
254 lines
6.2 KiB
C
/*
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* The GAT Stand
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* GAT Host Firmware
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* by true
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*
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* version 0.0.1
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*
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*
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* notes:
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*
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* - last 2K of flash memory is reserved for configuration storage
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*
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*
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* project todo:
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*
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* - implement config storage
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*
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* - implement USB CDC command shell
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*
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* - when USB is not active, go into super low power state
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* - light sensor is only checked once every two seconds or so
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* - buttons are on wakeup
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*/
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#include <ch32v20x.h>
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#include "periph/adc.h"
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#include "periph/btn.h"
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#include "periph/gat_gpio.h"
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#include "periph/port_pwr.h"
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#include "periph/rgbled.h"
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#include "periph/rtc.h"
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#include "periph/usb/cdc.h"
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#include "usb_lib.h"
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#include "console/console.h"
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void btn_top_push_cb(uint8_t idx)
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{
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// jumper 3, if set, will manage power by brightness automatically
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// only respect the button if this switch isn't set
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if (!(btn[DIP3]._mask & BTN_PUSH)) {
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gat_toggle();
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}
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}
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void btn_bot_push_cb(uint8_t idx)
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{
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// jumper 3, if set, will manage power by brightness automatically
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// only respect the button if this switch isn't set
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if (!(btn[DIP3]._mask & BTN_PUSH)) {
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usb2_toggle();
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}
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}
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static inline void systick_init(void)
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{
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SysTick->CMP = (SystemCoreClock / 256) - 1; // we want a 256Hz interrupt
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SysTick->CNT = 0; // clear counter
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SysTick->CTLR = 0xF; // start counter in /1 mode, enable interrupts, auto-reset counter
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SysTick->SR = 0; // clear count comparison flag
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NVIC_EnableIRQ(SysTicK_IRQn); // enable interrupt
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}
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static void gpio_init()
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{
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GPIO_InitTypeDef gpio = {0};
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gpio.GPIO_Speed = GPIO_Speed_2MHz;
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// unused pins
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gpio.GPIO_Mode = GPIO_Mode_IPD;
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gpio.GPIO_Pin = GPIO_Pin_13;
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GPIO_Init(GPIOC, &gpio);
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gpio.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
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GPIO_Init(GPIOD, &gpio);
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gpio.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8;
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GPIO_Init(GPIOA, &gpio);
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gpio.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_5 | GPIO_Pin_15;
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GPIO_Init(GPIOB, &gpio);
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// OSC32K: don't need to configure these pins from defaults
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// enabling RTC does whatever is needed for these pins (assumed from example)
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// RGBLED (PA0, PA1, PA2)
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RGBLED_PORT->BSHR = RGBLED_PIN_R | RGBLED_PIN_G | RGBLED_PIN_B;
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gpio.GPIO_Mode = GPIO_Mode_AF_PP;
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gpio.GPIO_Pin = RGBLED_PIN_R | RGBLED_PIN_G | RGBLED_PIN_B;
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GPIO_Init(RGBLED_PORT, &gpio);
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// GAT power enable (PA3)
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GAT_EN_PORT->BCR = GAT_EN_PIN;
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gpio.GPIO_Mode = GPIO_Mode_Out_PP;
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gpio.GPIO_Pin = GAT_EN_PIN;
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GPIO_Init(GAT_EN_PORT, &gpio);
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// lightsense anode (PA5)
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LSENS_A_PORT->BCR = LSENS_A_PIN;
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gpio.GPIO_Pin = LSENS_A_PIN;
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GPIO_Init(LSENS_A_PORT, &gpio);
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// lightsense cathode (PB0)
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LSENS_K_PORT->BCR = LSENS_K_PIN;
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gpio.GPIO_Pin = LSENS_K_PIN;
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GPIO_Init(LSENS_K_PORT, &gpio);
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// USB2 power enable (PB4)
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USB2_EN_PORT->BCR = USB2_EN_PIN;
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gpio.GPIO_Pin = USB2_EN_PIN;
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GPIO_Init(USB2_EN_PORT, &gpio);
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// GAT overcurrent detect (PA4)
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gpio.GPIO_Mode = GPIO_Mode_IPU;
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gpio.GPIO_Pin = GAT_OC_PIN;
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GPIO_Init(GAT_EN_PORT, &gpio);
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// buttons (PB10, PB11) and DIP switches (PB12, PB13, PB14)
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gpio.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14;
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GPIO_Init(GPIOB, &gpio);
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// GAT GPIO is configured in gat_gpio.c
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// USB PA11, PA12 will be configured later
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// unused pins that are used for I2C passthrough
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gpio.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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gpio.GPIO_Pin = GPIO_Pin_15;
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GPIO_Init(GPIOA, &gpio);
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gpio.GPIO_Pin = GPIO_Pin_3;
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GPIO_Init(GPIOB, &gpio);
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// USB PB6, PB7 will be configured later
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// I2C (PB8, PB9) - remapped
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GPIO_PinRemapConfig(GPIO_Remap_I2C1, ENABLE);
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gpio.GPIO_Speed = GPIO_Speed_10MHz;
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gpio.GPIO_Mode = GPIO_Mode_AF_OD;
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gpio.GPIO_Mode = GPIO_Pin_8 | GPIO_Pin_9;
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GPIO_Init(GPIOB, &gpio);
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}
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int main(void)
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{
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// configure core
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
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SystemCoreClockUpdate();
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// enable peripheral clocks
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RCC_APB1PeriphClockCmd( RCC_APB1Periph_PWR | RCC_APB1Periph_BKP |
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RCC_APB1Periph_I2C1 | RCC_APB1Periph_TIM2, ENABLE);
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RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA |
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RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOD |
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RCC_APB2Periph_ADC1, ENABLE);
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RCC_AHBPeriphClockCmd( RCC_AHBPeriph_USBHS, ENABLE);
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// configure gpio pins
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gpio_init();
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// configure RTC
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if (rtc_init()) {
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// rtc failed to initialize. let the end user know.
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// todo
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}
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// initialize buttons
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btn_init();
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btn[0].cb_push = btn_top_push_cb;
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btn[1].cb_push = btn_bot_push_cb;
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// set GAT GP pins weak pull to address the addon
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gat_gpio_init();
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// set output ports to saved state, or on if no batt / first boot
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port_pwr_init();
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// start up rgbled
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rgbled_init();
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// initialize light sense stuff
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adc_init();
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// get the system tick interrupt going
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systick_init();
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// initialize USB device for console shell
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usb_conf_clksource();
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USB_Init();
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usb_intr_init();
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console_init();
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// let's do this
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while (1) {
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// todo: add check to see if USB is connected
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if (1) {
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console_process();
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} else {
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console_stop();
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}
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__WFI();
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}
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}
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uint8_t st_tick;
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volatile uint32_t uptime;
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__attribute__((interrupt("WCH-Interrupt-fast")))
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void SysTick_Handler(void)
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{
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st_tick++;
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if (!st_tick) {
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uptime++;
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// jumper 3, if set, will manage power by brightness automatically
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if (btn[DIP3]._mask & BTN_PUSH) {
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if (adc_get_lsens_coarse() > LSENS_DARK) {
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gat_off();
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usb2_off();
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}
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if (adc_get_lsens_coarse() <= LSENS_BRIGHT) {
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gat_on();
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usb2_on();
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}
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}
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}
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// light sensor updating at ~4ms
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adc_process_lsens();
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// update buttons
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btn_poll();
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if (!(st_tick & 0x3)) {
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rgbled_update();
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}
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// clear comparison flag
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SysTick->SR = 0;
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if (SysTick->SR) {
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while (1);
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}
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}
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