eurorack/midi2cv/midi2cv.cc

#include <stm32f37x_conf.h>

#include "drivers/display.h"
#include "drivers/gpio.h"
#include "stmlib/system/system_clock.h"
#include "ui.h"

using namespace stmlib;

GPIO gpio;
Display display;
UI ui;
//SystemClock system_clock;

// Default interrupt handlers.
extern "C" {
void NMI_Handler() {}
void HardFault_Handler()
{
    while (1)
	;
}
void MemManage_Handler()
{
    while (1)
	;
}
void BusFault_Handler()
{
    while (1)
	;
}
void UsageFault_Handler()
{
    while (1)
	;
}
void SVC_Handler() {}
void DebugMon_Handler() {}
void PendSV_Handler() {}

// called every 1ms
void SysTick_Handler()
{
    IWDG_ReloadCounter();
    system_clock.Tick();
}

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) == RESET) {
	return;
    }
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
    
    // this will get called with 192 kHz (foof)
    // we want to reduce the amount of times the ui gets polled to 1kHz
    // which still is a lot (60fps would be enough tbh)

    static uint8_t count = 0;
    count++;
    if (count % 192 == 0) {
	ui.Update();
	count = 0;
    }
}
}

void InitTimers(void)
{
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    TIM_TimeBaseInitTypeDef timer_init;
    timer_init.TIM_Period = F_CPU / (48000 * 4) - 1; // 192 kHz, 48kHz for each audio DAC
    timer_init.TIM_Prescaler = 0;
    timer_init.TIM_ClockDivision = TIM_CKD_DIV1;
    timer_init.TIM_CounterMode = TIM_CounterMode_Up;
    timer_init.TIM_RepetitionCounter = 0;
    //TIM_InternalClockConfig(TIM2);
    TIM_TimeBaseInit(TIM2, &timer_init);
    TIM_Cmd(TIM2, ENABLE);

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); // 2.2 priority split.

    // DAC interrupt is given highest priority
    NVIC_InitTypeDef timer_interrupt;
    timer_interrupt.NVIC_IRQChannel = TIM2_IRQn;
    timer_interrupt.NVIC_IRQChannelPreemptionPriority = 0;
    timer_interrupt.NVIC_IRQChannelSubPriority = 1;
    timer_interrupt.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&timer_interrupt);
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
}

void Init(void)
{
    //SystemInit();
    NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x8000);
    IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
    IWDG_SetPrescaler(IWDG_Prescaler_16);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

    system_clock.Init();
    SysTick_Config(F_CPU / 8000);
    IWDG_Enable();
    gpio.Init();
    asm("bkpt #0");
    display.Init();
    InitTimers();
}

int main(void)
{
    Init();
    while (1) {
	//ui.Update();
    }
}