我现在正在使用STM32F100RB，我正在尝试从电位计读取值并通过PWM信号显示它。我的问题是我想连接它们的地方。 PWM信号通过以下代码生成：
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
uint32_t Prescaler, Period;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Enable TIM clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
/* Configure TIM1_CH1 as alternate function push-pull */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; // No point in overdriving
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Both these must ultimately fit in 16-bit, ie 1..65536 */
Prescaler = (SystemCoreClock / 20000); // System -> 20 KHz
Period = 2000; // 20 KHz -> 1 Hz
/* Extra caution required with TIM1/TIM8 full function timers, to initialize ALL fields */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(Prescaler - 1);
TIM_TimeBaseStructure.TIM_Period = (uint16_t)(Period - 1);
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // Where do those stairs go? They go up!
TIM_TimeBaseStructure.TIM_ClockDivision = 0; // Not used
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; // Not used
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_Pulse = (uint16_t)(Period / ADC1ConvertedValue[0]); // 50%
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
/* TIM1 enable counter */
TIM_Cmd(TIM1, ENABLE);
/* TIM1 Main Output Enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
while (1)
{
}
PWM输出正常工作，并显示应显示的内容。问题出在ADC上，其中某些东西似乎无法正常工作（代码来自制造商网站），这是完整的代码。
#include "stm32f10x.h"
//#include "stm32f10x_conf.h"
#include "stm32f10x_usart.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_tim.h"
#include "stm32f10x_adc.h"
#include "stm32f10x_dma.h"
#include "stm32f10x_flash.h"
#define ADC1_DR_Address ((uint32_t)0x4001244C)
#define BufferLenght 4
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
uint16_t ADC1ConvertedValue[BufferLenght];
ErrorStatus HSEStartUpStatus;
void RCC_Configuration(void);
void GPIO_Configuration(void);
RCC_Configuration();
GPIO_Configuration();
/* DMA1 channel1 configuration ---------------------------------------------*/
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC1ConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = BufferLenght;
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);
/* Enable DMA1 channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE);
/* ADC1 configuration ------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = BufferLenght;
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channel11, channel14, channel16 and channel17 configurations */
ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_17, 2, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_16, 3, ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 4, ADC_SampleTime_1Cycles5);
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Enable TempSensor and Vrefint channels: channel16 and Channel17 */
ADC_TempSensorVrefintCmd(ENABLE);
/* Enable ADC1 reset calibaration register */
ADC_ResetCalibration(ADC1);
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));
/* Start ADC1 calibaration */
ADC_StartCalibration(ADC1);
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
/* Test on Channel 1 DMA1_FLAG_TC flag */
while(!DMA_GetFlagStatus(DMA1_FLAG_TC1));
/* Clear Channel 1 DMA1_FLAG_TC flag */
DMA_ClearFlag(DMA1_FLAG_TC1);
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
uint32_t Prescaler, Period;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Enable TIM clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
/* Configure TIM1_CH1 as alternate function push-pull */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; // No point in overdriving
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Both these must ultimately fit in 16-bit, ie 1..65536 */
Prescaler = (SystemCoreClock / 20000); // System -> 20 KHz
Period = 2000; // 20 KHz -> 1 Hz
/* Extra caution required with TIM1/TIM8 full function timers, to initialize ALL fields */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(Prescaler - 1);
TIM_TimeBaseStructure.TIM_Period = (uint16_t)(Period - 1);
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // Where do those stairs go? They go up!
TIM_TimeBaseStructure.TIM_ClockDivision = 0; // Not used
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; // Not used
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_Pulse = (uint16_t)(Period / ADC1ConvertedValue[0]); // 50%
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
/* TIM1 enable counter */
TIM_Cmd(TIM1, ENABLE);
/* TIM1 Main Output Enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
while (1)
{
}
}
/**
* @brief Configures the different system clocks.
* @param None
* @retval None
*/
void RCC_Configuration(void)
{
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
/* ADCCLK = PCLK2/4 */
RCC_ADCCLKConfig(RCC_PCLK2_Div4);
#ifndef STM32F10X_CL
/* PLLCLK = 8MHz * 7 = 56 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_7);
#else
/* Configure PLLs *********************************************************/
/* PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */
RCC_PREDIV2Config(RCC_PREDIV2_Div5);
RCC_PLL2Config(RCC_PLL2Mul_8);
/* Enable PLL2 */
RCC_PLL2Cmd(ENABLE);
/* Wait till PLL2 is ready */
while (RCC_GetFlagStatus(RCC_FLAG_PLL2RDY) == RESET)
{}
/* PLL configuration: PLLCLK = (PLL2 / 5) * 7 = 56 MHz */
RCC_PREDIV1Config(RCC_PREDIV1_Source_PLL2, RCC_PREDIV1_Div5);
RCC_PLLConfig(RCC_PLLSource_PREDIV1, RCC_PLLMul_7);
#endif
/* Enable PLL */
RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
/* Enable DMA1 clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* Enable peripheral clocks --------------------------------------------------*/
/* Enable ADC1 and GPIOC clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
}
/**
* @brief Configures the different GPIO ports.
* @param None
* @retval None
*/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure PC.01 and PC.04 (Channel11 and Channel14) as analog input -----*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
我将这两部分代码组合在一起，我应该分配TIM_Pulse的值： TIM_OCInitStructure.TIM_Pulse =（uint16_t）（Period / ADC1ConvertedValue [0]）;
我是嵌入式编程的新手，我刚刚开始玩这块板，我想达到的目标是根据电位器值设置脉冲长度。 先感谢您， 亚历克斯。
答案 0 :(得分：1)
修改后的代码如下所示：
#include "stm32f10x_conf.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_adc.h"
#include "stm32f10x_tim.h"
double x = 0;
GPIO_InitTypeDef myGPIO;
ADC_InitTypeDef myADC;
void adc_config()
{
//ADC
myGPIO.GPIO_Pin = GPIO_Pin_6; //setat pe pin6
myGPIO.GPIO_Mode = GPIO_Mode_AIN; //setare ca analog
GPIO_Init(GPIOA, &myGPIO); //set to A6
RCC_ADCCLKConfig (RCC_PCLK2_Div6); //ceas pentru ADC (max 14MHz, 72/6=12MHz)
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //ceas ADC
//configurare parametrii ADC
myADC.ADC_Mode = ADC_Mode_Independent;
myADC.ADC_ScanConvMode = DISABLE;
myADC.ADC_ContinuousConvMode = ENABLE;
myADC.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
myADC.ADC_DataAlign = ADC_DataAlign_Right;
myADC.ADC_NbrOfChannel = 1;
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 1, ADC_SampleTime_55Cycles5); //PA6 as Input
ADC_Init(ADC1, &myADC);
//enable
ADC_Cmd(ADC1, ENABLE);
ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));
ADC_Cmd(ADC1, ENABLE);
}
int getPot(void)
{
return ADC_GetConversionValue(ADC1);
}
//configurare pini I/O
void GPIO_config(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
//LED-pinC9
GPIO_StructInit(&myGPIO);
myGPIO.GPIO_Pin = GPIO_Pin_9;
myGPIO.GPIO_Mode = GPIO_Mode_Out_PP;
myGPIO.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOC, &myGPIO);
}
int main(void)
{
GPIO_config(); //configurare pini
adc_config(); //configurare ADC
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
uint32_t Prescaler, Period;
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Enable TIM clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
/* Configure TIM1_CH1 as alternate function push-pull */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; // No point in overdriving
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Both these must ultimately fit in 16-bit, ie 1..65536 */
Prescaler = (SystemCoreClock / 200000); // System -> 20 KHz
Period = 2000; // 20 KHz -> 1 Hz
/* Extra caution required with TIM1/TIM8 full function timers, to initialize ALL fields */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(Prescaler - 1);
TIM_TimeBaseStructure.TIM_Period = (uint16_t)(Period - 1);
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // Where do those stairs go? They go up!
TIM_TimeBaseStructure.TIM_ClockDivision = 0; // Not used
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; // Not used
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
while(1)
{
x = getPot()*3.3/4096; //obtinere valoare analog si convertirea in volti, 12bit ADC
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_Pulse = (uint16_t)(Period / x); // 50%
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
/* TIM1 enable counter */
TIM_Cmd(TIM1, ENABLE);
/* TIM1 Main Output Enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
if(x > 2)
{
GPIO_WriteBit(GPIOC, GPIO_Pin_9, Bit_SET);//pornire Led
}
else {
GPIO_WriteBit(GPIOC, GPIO_Pin_9, Bit_RESET);//oprire Led
}
}
}
感谢@Olaf。