#include "gpio.h" #include "stm32c0xx.h" #include "system.h" void setup() { pin_mode(PinA5, OutputPushPull); // if ((RCC->CFGR >> RCC_CFGR_SWS_Pos) & 7 == 0) // pin_set(PinA5); // printf("SWS %d\n", (RCC->CFGR >> RCC_CFGR_SWS_Pos) & 7); //SystemCoreClockUpdate(); //SysTick_Config(SystemCoreClock / 1000); } void loop() { if (system_ms() % 1000 < 500) pin_set(PinA5); else pin_reset(PinA5); //printf("%d\n", ms); } //#include "stdio.h" //#include "float.h" /* void RCC_Config () { RCC->IOPENR|= (1UL << 1); // Enable the GPIOB peripheral RCC->IOPENR|= (1UL << 0); // Enable the GPIOA peripheral RCC->CR&=~(1<<8); //HSI OFF RCC->CR|=(1<<16); //HSE ON RCC->CR|=1<<19; // CSS ON (SECURITY) optional RCC->CR=0x00090000; while (!(RCC->CR & (1<<17)));//wait HSE flag active. while(1) in loop, but while(0) out loop. When HSE is on(1 and 1=1 and !1-0) then while(0) out loop RCC->CFGR&=~(1<<2); // System clock switch source HSE RCC->CFGR&=~(1<<1); // System clock switch source HSE RCC->CFGR|=(1<<0); // System clock switch source HSE RCC->CFGR|=(1<<24); // Microcontroller clock output clock selecto RCC->CFGR|=(2<<8); //AHB prescaler 2 RCC->AHBENR|=(1<<12);//CRC clock enable RCC->AHBENR|=(1<<8);//CRC clock enable RCC->APBENR2|=1<<20;//APB2 bus enable for ADC } void GPIO_Config () { GPIOA->MODER|=3<<4; } //////////////////////////////////// void ADC_Config () { ADC1->CR&=~(1<<0); //ADC is OFF while(ADC1->ISR&(1<<0)) ADC1->CFGR1|=1<<13; ADC1->CFGR1|2<<3; ADC1->CHSELR|=1<<2; ADC1->CR|=1<<0; while(!(ADC1->ISR&(1<<0))); } float voltage; int integer_voltage; int fractional_voltage; int fraction_extractor (int integer_voltage, float voltage ) { fractional_voltage=1000*(voltage-integer_voltage); return fractional_voltage; } int main () { RCC_Config (); GPIO_Config (); ADC_Config (); while(1) { ADC1->CR |= 1 << 2; // Start the conversion int analog_value = ADC1->DR ; // Reading Data Register voltage=(3.3/4095)*analog_value; fractional_voltage=fraction_extractor (integer_voltage, voltage ); integer_voltage=voltage; //printf("Analog voltage: %d.%d V\n", integer_voltage, fractional_voltage); }} */