蓝桥杯嵌入式学习————USART、ADC
串口
直接上代码吧
void USART_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); //开启串口时钟
//设置usart2 tx引脚工作模式PA2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//设置usart2 rx引脚工作模式PA3
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);
//usart2 工作模式配置
USART_InitStructure.USART_BaudRate = 19200; //波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位长度
USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位
USART_InitStructure.USART_Parity = USART_Parity_No ; //奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE); //使能
}
//发送函数
void USART_SendString(int8_t *str)
{
uint8_t index = 0;
do
{
USART_SendData(USART2,str[index]);
while(USART_GetFlagStatus(USART2,USART_FLAG_TXE) == RESET);
index++;
}
while(str[index] != 0); //¼ì²é×Ö·û´®½áÊø±êÖ¾
}
ADC
参考博文点击此处
在配置引脚输入模式时配置为模拟输入模式
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
引脚对应关系
void ADC_RegularChannelConfig(ADC_TypeDef* ADCx, u8 ADC_Channel, u8 Rank, u8 ADC_SampleTime)
该函数的参数ADC_Channel,Rank是代表什么?
这个在你多通道采集和DMA应用时会有很大的作用,比如你需要多通道采集,你设置每个通道的采集顺序其实就是用这个变量来做的,假设你定义channle1 的rank=1,channle2 的rank=2,那么对应你在DMA缓存空间的变量数组AdcDMA[0] 就i是channle1的转换结果,AdcDMA[1]就是通道2的转换结果。
code:
void ADC_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
//PB0-ADC channel 8
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// ADC1 工作模式配置
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //µ¥´Îת»»
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_RegularChannelConfig(ADC1, ADC_Channel_8, 1, ADC_SampleTime_13Cycles5);
ADC_Cmd(ADC1, ENABLE);
ADC_ResetCalibration(ADC1);
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));
}
//读函数
float Read_ADC(void)
{
float ADC_VALUE;
ADC_SoftwareStartConvCmd(ADC1,ENABLE);
Delay_Ms(5);
ADC_VALUE = ADC_GetConversionValue(ADC1)*3.30/0xfff;
return ADC_VALUE;
}
//main函数中的片段
while(1){
//200ms采样一次
if(ADC_Flag){
ADC_Flag = 0;
adc_temp = Read_ADC();
sprintf(string,"%s%.3f","ADC Value:",adc_temp);
LCD_DisplayStringLine(Line7,string);
}
很草率,还会再看一遍的><