805489c98f
what remains to be done: - soft i2c master timings - clock mode switching and render compensation when using i2c master code - testing
153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/*
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* RETRO TECH 2025
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* GAT Addon Firmware
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* by true
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*
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* version 0.1.1
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* Last Update 20250723
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*
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* code was made for different random addons I designed for dc32,
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* then adapted to each one. it worked OK. this code was then more
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* or less directly ported to another MCU. so things might be a mess.
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*
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* I had only a few hours on and off over a week to get the code done.
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* lots of shit was copied from demo code and adapted to work. certainly
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* isn't the best way to get this done.
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*
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* I know I could save some power, but seeing as all the badges burn it in
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* LEDs and almost nobody else power optimizes their badge code, who cares?
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*
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* sorry. wasn't procrastination I swear. all the ideas were last minute.
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*/
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#include <ch32x035.h>
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#include <stdint.h>
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#include "src/adc.h"
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#include "src/btn.h"
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#include "src/config.h"
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#include "src/i2c_soft.h"
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#include "src/led.h"
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#include "src/led_rgbprog.h"
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#include "src/rand.h"
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#include "src/ui.h"
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void systick_init(void)
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{
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SysTick->CMP = (SystemCoreClock / 512) - 1; // we want a 512Hz 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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void gpio_init()
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{
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GPIO_InitTypeDef gpio = {0};
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gpio.GPIO_Speed = GPIO_Speed_50MHz;
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// jogwheel digital inputs, active low (PA4-PA6)
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gpio.GPIO_Mode = GPIO_Mode_IPU;
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gpio.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6;
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GPIO_Init(GPIOA, &gpio);
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// lightsense LED cathode (PA7, A8)
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gpio.GPIO_Mode = GPIO_Mode_AIN;
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gpio.GPIO_Pin = GPIO_Pin_7;
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GPIOA->BSHR = GPIO_Pin_7;
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GPIO_Init(GPIOA, &gpio);
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// potentiometer (PB1, A9)
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gpio.GPIO_Pin = GPIO_Pin_1;
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GPIO_Init(GPIOB, &gpio);
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// lightsense LED anode
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gpio.GPIO_Mode = GPIO_Mode_Out_PP;
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gpio.GPIO_Pin = GPIO_Pin_7;
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GPIOB->BCR = GPIO_Pin_7;
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GPIO_Init(GPIOB, &gpio);
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// USB (unused in application) - PC16, PC17
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// debug (not changed in application) - PC18, PC19
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// EEP_WP EEPROM write protect (PA9) (active high)
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// IS_SDB IS31FL3729 shutdown pin (PC3) (active low)
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gpio.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIOA->BCR = GPIO_Pin_9;
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gpio.GPIO_Pin = GPIO_Pin_9;
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GPIO_Init(GPIOA, &gpio);
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GPIOC->BCR = GPIO_Pin_3;
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gpio.GPIO_Pin = GPIO_Pin_3;
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GPIO_Init(GPIOC, &gpio);
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// I2C SCL, SCA for addon header
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gpio.GPIO_Mode = GPIO_Mode_AF_PP;
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gpio.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
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GPIO_Init(GPIOA, &gpio);
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// software I2C, SCL for on-board devices
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gpio.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIOA->BCR = GPIO_Pin_0 | GPIO_Pin_1;
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gpio.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
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GPIO_Init(GPIOA, &gpio);
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// UART RX/TX on addon header; not currently used
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gpio.GPIO_Mode = GPIO_Mode_IPU;
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gpio.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
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GPIO_Init(GPIOA, &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_I2C1, ENABLE);
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RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA |
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RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC |
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RCC_APB2Periph_ADC1 | RCC_APB2Periph_TIM1, ENABLE);
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// configure gpio pins, hard buttons (used for settings reset)
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gpio_init();
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// get saved settings, or reset if BTN1 is pushed
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i2cm_init();
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userconf_load((BTN_PORT->INDR & (1 << BTN1_PIN)) ? 0 : 1);
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// configure hardware
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adc_init();
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btn_init();
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led_init();
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// configure random
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tinymt32_init(&tinymt32_s, DBGMCU_GetCHIPID() | userconf.checksum);
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// configure UI
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ui_init();
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// configure systick interrupt
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systick_init();
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// set up LEDs initially
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led_rgb_firstrun();
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// do system shit
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while(1) {
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__WFI();
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// after sending LEDs, run LED render program
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// to update the LED buffer for next time
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// we have approx 7ms to render... plenty of time
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if ((ticnt & 0x3) == 0) {
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ui_render();
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}
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}
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}
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