initial WIP

lots of code copied over, things filled in to hopefully get the LED matrix lighting up. untested.

firmware/app/main.c

@@ -0,0 +1,175 @@
+/*
+ *      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()
+{
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
+                           RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO  |
+                           RCC_APB2Periph_ADC1  | RCC_APB2Periph_SPI1, ENABLE);
+
+    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
+}
+
+
+
+/*********************************************************************
+ * @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 ~1440Hz wakeup interrupt for main program
+    // TODO: confirm if the counter is reset / preloaded
+    AWU_SetPrescaler(AWU_Prescaler_32);
+    AWU_SetWindowValue(0x3e);
+    AutoWakeUpCmd(ENABLE);
+
+    while (1) {
+        // low-priority tasks like
+        // rendering next LED program output frame
+        if (lp_render) {
+            lp_render = 0;
+            lp_ribbon_upward(800, 3, 2);
+        }
+
+        // stay a while
+        // __WFI();
+    }
+}
+
+
+void AWU_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
+void AWU_IRQHandler(void)
+{
+    cnt++;
+    if (cnt >= 1440) {
+        cnt = 0;
+        wake_uptime++;
+    }
+
+    // handle render new frame at 90Hz
+    if ((cnt & 0xf) == 0) {
+        lp_render = 1;
+    }
+
+    // send led matrix data to matrix chip
+    matrix_send();
+
+    // handle ADC
+
+    // handle buttons
+
+    // do we sleep?
+}