hsc26-artemis2/firmware/app/main.c

/*
 *      HSC26 Artemis II
 *
 * 2026 true
 *
 * todo:
 * - implement SPI master for accelerometer (done, blocking / basic)
 * - configure ADC to get touchpads (done)
 * - get main tick interrupt working
 *
 * - get user input working (buttons, touchpads)
 * - configure accelerometer for wakeup / sleep
 * - configure buttons to wake up in case of sleep
 * - write lightshows
 * - write userconfig stuff, save to end of FLASH
*/


#include "ch32x035_conf.h"

#include "comms/soft_i2c_master.h"
#include "comms/spi_master.h"

#include "driver/adc.h"

#include "led/matrix.h"
#include "led/ledprog.h"

/*
 *@Note
 ***Only PA0--PA15 and PC16--PC17 support input pull-down.
 */


uint16_t cnt = 0;
volatile uint32_t wake_uptime = 0;

volatile uint8_t lp_render = 0;



void clk_init()
{
    SystemCoreClockUpdate();
}
    

void periphclk_init()
{
    // needed for GPIO, remap, ADC, SPI
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
                           RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO  |
                           RCC_APB2Periph_ADC1  | RCC_APB2Periph_SPI1, ENABLE);

    // may be needed for AWU
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

    // needed for DMA, USBPD
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 | RCC_AHBPeriph_USBPD, ENABLE);
}

void gpio_init()
{
    GPIO_InitTypeDef gpio = {0};

    gpio.GPIO_Speed = GPIO_Speed_50MHz;
    
    // PA0-PA4 touch0-touch4
    gpio.GPIO_Mode = GPIO_Mode_AIN;
    gpio.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4;    
    GPIO_Init(GPIOA, &gpio);
    // PB0 touch8
    gpio.GPIO_Pin = GPIO_Pin_0;
    GPIO_Init(GPIOB, &gpio);
    // PC0 VBAT, PC3 touch13
    gpio.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_3;
    GPIO_Init(GPIOC, &gpio);

    // PA5 SCK, PA7 MOSI
    gpio.GPIO_Mode = GPIO_Mode_AF_PP;
    gpio.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;
    GPIO_Init(GPIOA, &gpio);

    // PA6 MISO
    gpio.GPIO_Mode = GPIO_Mode_IPU;
    gpio.GPIO_Pin = GPIO_Pin_6;
    GPIO_Init(GPIOA, &gpio);

    // PB3 LIS_INT, PB8 soft I2C SCL, PB9 soft I2C SDA, PB11 btn0, PB12 btn1
    gpio.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_11 | GPIO_Pin_12;
    GPIO_Init(GPIOB, &gpio);
    
    // PC10 USB DP (btn2), PC11 USB DM (unused)
    gpio.GPIO_Mode = GPIO_Mode_IPD;
    gpio.GPIO_Pin = GPIO_Pin_16 | GPIO_Pin_17;
    GPIO_Init(GPIOC, &gpio);

    // PB4 LSENS A, PB5 LSENS_K, PB6 SPI softCS, PB7 LED HWEN, PB10 STAT LED
    GPIOB->BCR = 0x4f0;
    gpio.GPIO_Mode = GPIO_Mode_Out_PP;
    gpio.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_10;
    GPIO_Init(GPIOB, &gpio);

    // PC14 CC1, PC15 CC2
    // todo later
}

void awu_init()
{
    NVIC_InitTypeDef nvic;
    EXTI_InitTypeDef exti = {0};

    // configure AWU
    AWU_SetPrescaler(AWU_Prescaler_1);
    AWU_SetWindowValue(0x2f);
    AutoWakeUpCmd(ENABLE);

    // configure EXTI line
    exti.EXTI_Line = EXTI_Line27;
    exti.EXTI_Mode = EXTI_Mode_Interrupt;
    exti.EXTI_Trigger = EXTI_Trigger_Rising;
    exti.EXTI_LineCmd = ENABLE;
    EXTI_Init(&exti);

    // configure PFIC interrupt
    nvic.NVIC_IRQChannel = AWU_IRQn;
    nvic.NVIC_IRQChannelPreemptionPriority = 0;
    nvic.NVIC_IRQChannelSubPriority = 0;
    nvic.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&nvic);
}



/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

    clk_init();
    periphclk_init();
    gpio_init();

    // initialize led programs
    lp_ribbon_init();

    // set up soft I2C and configure lighting controller
    i2cm_init();
    matrix_init();

    // set up touchsensing and light sensing
    adc_init();    

    // set up accelerometer
    spim_init();

    // configure AWU to provide ~997Hz wakeup interrupt for main program
    // TODO: confirm if the counter is reset / preloaded
    awu_init();

    while (1) {
        // low-priority tasks like
        // rendering next LED program output frame
        if (lp_render) {
            lp_render = 0;
            lp_ribbon_upward(200, 3, 4);            
        }

        // stay a while
        // __WFI();
        PWR_EnterSTANDBYMode();
    }
}


void AWU_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
void AWU_IRQHandler(void)
{
    // clear interrupt flag
    EXTI_ClearFlag(EXTI_Line27);

    // SetSysClock_HSI(HCLK_24MHZ);

    cnt++;
    if (cnt >= 1000) {
        cnt = 0;
        wake_uptime++;
    }

    // handle render new frame at ~100Hz
    if ((cnt % 10) == 0) {
        lp_render = 1;
    }

    // send led matrix data to matrix chip
    matrix_send();

    // handle ADC
    adc_next();

    // handle buttons
}