dc32-retro-tech-addon/firmware/retro_tech_fw/user/main.c

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/*
* RETRO TECH COMMUNITY
* GAT Addon Firmware
* by true
*
* code was made for different random addons I designed for dc32,
* then adapted to each one. so things might be a mess.
*
* I had only a few hours on and off over a week to get the code done.
* lots of shit was copied from demo code and adapted to work. certainly
* isn't the best way to get this done.
*
* I know I could save some power, but seeing as all the badges burn it in
* LEDs and almost nobody else power optimizes their badge code, who cares?
*
* sorry. wasn't procrastination I swear. all the ideas were last minute.
*/
#include <ch32v00x.h>
#include <stdint.h>
#include "src/adc.h"
#include "src/btn.h"
#include "src/config.h"
#include "src/i2c.h"
#include "src/led.h"
#include "src/rand.h"
#include "src/ui.h"
void systick_init(void)
{
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SysTick->CMP = (SystemCoreClock / 512) - 1; // we want a 512Hz interrupt
SysTick->CNT = 0; // clear counter
SysTick->CTLR = 0xF; // start counter in /1 mode, enable interrupts, auto-reset counter
SysTick->SR = 0; // clear count comparison flag
NVIC_EnableIRQ(SysTicK_IRQn); // enable interrupt
}
void gpio_init()
{
GPIO_InitTypeDef gpio = {0};
gpio.GPIO_Speed = GPIO_Speed_2MHz;
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// GAT SoftI2C, USART TX/RX; currently unused
gpio.GPIO_Mode = GPIO_Mode_IPD;
gpio.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6;
GPIO_Init(GPIOD, &gpio);
gpio.GPIO_Pin = GPIO_Pin_1;
GPIO_Init(GPIOA, &gpio);
// lightsense LED anode
gpio.GPIO_Mode = GPIO_Mode_Out_OD;
gpio.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOD, &gpio);
// unused pins
gpio.GPIO_Mode = GPIO_Mode_IPD;
gpio.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_7;
GPIO_Init(GPIOC, &gpio);
gpio.GPIO_Pin = GPIO_Pin_2;
GPIO_Init(GPIOD, &gpio);
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// I2C SCL, SCA for on-board devices
gpio.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2;
gpio.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOC, &gpio);
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// IS_SDB (PC3) IS31FL3729 shutdown pin (active low)
// WP (PC6) for EEPROM
GPIOC->BCR = GPIO_Pin_3;
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GPIOC->BSHR = GPIO_Pin_6;
gpio.GPIO_Mode = GPIO_Mode_Out_PP;
gpio.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_6;
GPIO_Init(GPIOC, &gpio);
// BTN1, BTN2 will be handled by button handler
}
int main(void)
{
// configure core
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
SystemCoreClockUpdate();
// enable peripheral clocks
RCC_APB1PeriphClockCmd( RCC_APB1Periph_PWR | RCC_APB1Periph_I2C1, ENABLE);
RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA |
RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD |
RCC_APB2Periph_ADC1 | RCC_APB2Periph_TIM1, ENABLE);
// configure gpio pins
gpio_init();
// get saved settings
i2c_init();
userconf_load();
// configure hardware
adc_init();
btn_init();
led_init();
// configure random
tinymt32_init(&tinymt32_s, DBGMCU_GetCHIPID() | userconf.checksum);
// configure UI
ui_init();
// configure systick interrupt
systick_init();
// do system shit
while(1) {
__WFI();
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// after sending LEDs, run LED render program
// to update the LED buffer for next time
// we have approx 7ms to render... plenty of time
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if ((ticnt & 0x3) == 0) {
ui_render();
}
}
}