STM32F103RCT6

洪嵐峰

製作數控可調直流穩壓電源所需零件：

STM32F103RCT6 微控制器
2x16 LCD 顯示屏
10K 電位器
LM317 穩壓芯片
MOSFET 集成電路
電感和電容
電路板、連接器和電線等常用電子元件


STM32F103RCT6 微控制器的引腳配置如下：

引腳        功能
PA0        電源開關
PA1        調節旋鈕
PA2        輸出電壓檢測
PB0        LCD 數據線
PB1        LCD 數據線
PB6        LCD 使能信號
PB7        LCD RS 信號
PB8        MOSFET 控制信號


程式碼：

以下是 STM32F103RCT6 微控制器的示例代碼
用於控制電源的開關、輸出電壓和 LCD 顯示：


#include "stm32f10x.h"
#include "delay.h"
#include "lcd.h"

#define AD_MAX 4096     // A/D 轉換器最大值
#define AD_REF 3.3f     // A/D 參考電壓
#define V_OUT_MIN 1.25f // 輸出電壓最小值
#define V_OUT_MAX 31.0f  // 輸出電壓最大值

float v_set = 5.0f;     // 輸出電壓設定值
float v_out = 0.0f;     // 實際輸出電壓
uint16_t ad_value = 0;  // A/D 轉換器讀取值

void ADC_Init()
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    ADC_InitTypeDef ADC_InitStructure;
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_Cmd(ADC1, ENABLE);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_55Cycles5);

    DMA_InitTypeDef DMA_InitStructure;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ad_value;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = 1;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc =
    DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA1_Channel1, &DMA_InitStructure);

DMA_Cmd(DMA1_Channel1, ENABLE);

ADC_DMACmd(ADC1, ENABLE);

ADC_ResetCalibration(ADC1);
while (ADC_GetResetCalibrationStatus(ADC1));

ADC_StartCalibration(ADC1);
while (ADC_GetCalibrationStatus(ADC1));
}

void PWM_Init()
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 1000 - 1;
TIM_TimeBaseStructure.TIM_Prescaler = 71;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_Pulse = 500;
TIM_OC1Init(TIM4, &TIM_OCInitStructure);

TIM_Cmd(TIM4, ENABLE);
}

void GPIO_Init()
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}

int main(void)
{
ADC_Init();
PWM_Init();
GPIO_Init();
LCD_Init();
LCD_Clear();
LCD_WriteString("DC Power Supply");
LCD_SetCursor(0, 1);
LCD_WriteString("Voltage: 0.00V");

while (1)
{
    // 讀取調節旋鈕
    uint16_t ad_value_set = ADC_GetConversionValue(ADC1);
    float v_set_temp = V_OUT_MAX * ad_value_set / AD_MAX;
    if (v_set_temp < V_OUT_MIN)
    {
        v_set_temp = V_OUT_MIN;
    }
    else if (v_set_temp > V_OUT_MAX)
    {
        v_set_temp = V_OUT_MAX;
    }
    v_set = v_set_temp;

    // 讀取輸出電壓
    v_out = V_OUT_MAX * ad_value / AD_MAX;

    // 控制輸出電壓
    float duty_cycle = (v_set / V_OUT_MAX) * 100;
    TIM_SetCompare1(TIM4, duty_cycle * 10);

    // 顯示輸出電壓
    char buffer[16];

    snprintf(buffer, sizeof(buffer), "Voltage: %.2fV", v_out);
    LCD_SetCursor(0, 1);
    LCD_WriteString(buffer);

    // 判斷是否需要輸出警告信息
    if (v_out < v_set - V_ERR_RANGE || v_out > v_set + V_ERR_RANGE)
    {
        LCD_SetCursor(0, 2);
        LCD_WriteString("Warning!");
    }
    else
    {
        LCD_SetCursor(0, 2);
        LCD_WriteString("         ");
    }

    delay_ms(100);
}
}

void delay_ms(uint16_t ms)
{
volatile uint32_t nCount;
RCC_ClocksTypeDef RCC_Clocks;
RCC_GetClocksFreq(&RCC_Clocks);
nCount = (RCC_Clocks.HCLK_Frequency / 10000) * ms;
for (; nCount != 0; nCount--);
}