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149 lines
3.1 KiB
149 lines
3.1 KiB
#include "init.h"
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#include "utils/gpio.h"
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#include "utils/usart.h"
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#include "utils/nvic.h"
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// This file contains examples of initializing some peripherals
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void init_gpios(void)
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{
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gpio_enable(GPIOC);
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// LEDs
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gpio_set_mode(GPIOC, BIT8 | BIT9, MODER_OUTPUT);
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}
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void init_clock(void)
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{
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// Flash timing - 64-bit access, pre-fetch, latency = 1
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FLASH_ACR |= FLASH_ACR_ACC64; // Cannot write both at once
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FLASH_ACR |= FLASH_ACR_PRFTEN | FLASH_ACR_LATENCY;
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// Power on HSI (runs from MSI on start)
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RCC_CR |= RCC_CR_HSION;
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// Wait for HSIRDY
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while (!(RCC_CR & RCC_CR_HSIRDY));
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// Select HSI as the core clock source
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RCC_CFGR &= ~RCC_CFGR_SW;
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RCC_CFGR |= RCC_CFGR_SW_HSI;
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}
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void init_usart(void)
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{
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gpio_set_af(GPIOA, BIT2 | BIT3, AF7);
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// USART2 at A2 (tx), A3 (rx)
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RCC_APB1ENR |= RCC_APB1ENR_USART2EN;
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// RATE 9600Bd 104.1875 (see datasheet for reference)
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//USART2_BRR = 0x00683; // 9600 @ 16MHz
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USART2_BRR = 0x0008A; // 115200 @ 16MHz
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// USART enable
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USART2_CR1 = USART_CR1_UE | USART_CR1_RE | USART_CR1_TE;
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// enable interrupt on data receive
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nvic_enable_irq(NVIC_USART2_IRQ);
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USART2_CR1 |= USART_CR1_RXNEIE;
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}
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void init_systick(void)
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{
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patch_register(SysTick_CSR, SysTick_CSR_CLKSOURCE, 1); // 1 - core, 0 - div 8
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SysTick_RELOAD = 16000; // 1ms interrupt @ 16MHz core clock
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SysTick_CSR |= SysTick_CSR_TICKINT | SysTick_CSR_ENABLE;
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}
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// ----
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void init_adc(void)
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{
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gpio_set_mode(GPIOB, BIT1 | BIT0 | BIT12, MODER_ANALOG); // configure pins you want to use
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// enable clock for ADC
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RCC_APB2ENR |= RCC_APB2ENR_ADC1EN;
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// 12-bit, right aligned
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ADC1_CR1 = 0;
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ADC1_CR2 = 0;
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// enable internal temperature sensor (16) & voltage reference (17)
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ADC_CCR |= ADC_CCR_TSVREFE;
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ADC1_SMPR3 = 0b100; // sample time
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// turn ADC on
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ADC1_CR2 |= ADC_CR2_ADON;
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// Wait for ADONS
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while (!(ADC1_SR & ADC_SR_ADONS));
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}
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// EXAMPLE to measure an ADC channel
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uint16_t adc_measure(uint8_t channel)
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{
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ADC1_SQR5 = channel; // select n-th channel
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ADC1_SQR1 = 0; // sets length to 1 (0000)
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ADC1_CR2 |= ADC_CR2_SWSTART; // start conversion
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// wait for end of conversion
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while (!(ADC1_SR & ADC_SR_EOC));
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return ADC1_DR;
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}
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// ----
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void init_dac(void)
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{
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RCC_APB1ENR |= RCC_APB1ENR_DACEN; // enable DAC
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gpio_set_mode(GPIOA, BIT4, MODER_ANALOG); // PA4 - DAC CH1 out
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DAC_CR |= DAC_CR_EN1; // enable first channel
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DAC_DHR12R1 = 0; // reset value
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}
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void init_pwm1(void)
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{
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// enable clock for the timer
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RCC_APB1ENR |= RCC_APB1ENR_TIM3EN;
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// using timer 3, channel 1
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gpio_set_af(GPIOA, BIT6, AF2); // A6 PWM output
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patch_register(TIM3_CCMR1, TIM_CCMR1_OC1M, TIM_OCM_PWM1); // set PWM1 mode
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TIM3_CCMR1 |= TIM_CCMR1_OC1PE; // preload enable
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TIM3_CR1 |= TIM_CR1_ARPE; // auto reload is buffered
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TIM3_CCER |= TIM_CCER_CC1E; // enable output compare (PWM output)
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patch_register(TIM3_CR1, TIM_CR1_CMS, TIM_CMS_EDGE); // centering mode
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patch_register(TIM3_CR1, TIM_CR1_DIR, 0); // count upwards only
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// frequency set to 16 kHz
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TIM3_PSC = 0; // prescaller
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TIM3_ARR = 1000; // sets frequency
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TIM3_CCR1 = 0; // duty cycle
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// generate update event to latch the value registers
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TIM3_EGR |= TIM_EGR_UG;
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TIM3_CR1 |= TIM_CR1_CEN; // enable timer.
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}
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