i'm implementing a project using stm32f101cb microcontroller. I understand that this control have 3 timer in it. TIM2 and TIM4 had been set to encoder mode to capture 2 rotary encoder.
I'm now left me the only timer TIM3, I would to ask is there possible for me to set TIM3 to PWM mode and at the same time doing the normal timer interrupt? I could not find it in reference manual or programming manual.
Thanks!
It should be possible. I'm doing it for an STM32F091RC I've developed an application for where I'm controlling LED:s with PWM and generating a timer update interrupt (counter reset) with the same timer peripheral.
Here's some of my configuration code:
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* LED_TIM clock enable */
RCC_APB1PeriphClockCmd(TIM_LED_RCC, ENABLE);
/* LED_PORT Configuration: Channel 1, 2, 3 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = LED_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(LED_PORT, &GPIO_InitStructure);
GPIO_PinAFConfig(LED_PORT, LED_PIN_SOURCE, LED_TIM_AF);
/* Enable the TIM global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = LED_TIM_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = LED_TIM_PSC;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 0xFFFF; // Max 0xFFFF
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
/* Channel 1 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_Pulse = LED_INIT_PULSE;
TIM_OC1Init(LED_TIM, &TIM_OCInitStructure); // Init Channel 1
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable);
/* TIM IT enable */
TIM_ITConfig(LED_TIM, TIM_IT_Update, ENABLE); // Enable interrupts for LED_TIM
/* LED_TIM counter enable */
TIM_Cmd(LED_TIM, ENABLE);
/* LED_TIM Main Output Enable */
TIM_CtrlPWMOutputs(LED_TIM, ENABLE);
Should be very similar for your device. If everything works correctly, you should be getting interrupts in your TIM3_IRQHandler ISR
void TIM3_IRQHandler(void)
{
if (TIM_GetITStatus(LED_TIM, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(LED_TIM, TIM_IT_Update);
// Do ISR stuff here!
}
}
Related
I have an implementation for USART communication from a GPS module to a STM32F091 microcontroller.
For some reason I only receive nonsense. I have already tried setting different Baud Rates, but none gave me a proper result.
Now I am unsure if maybe there is something funky with prescaler settings or something else I forgot.
The relevant code looks as follows:
peripherals.c
/* Clock settings */
void clock_init(void)
{
/* Enable HSI clock */
RCC->CR |= RCC_CR_HSION;
/* Enable clocks on Port A, B, F */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOF, ENABLE);
/* Enable USART clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
}
/* Select Alternate Port Functions */
void alt_init(void)
{
/* Port A: USART1 */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);
/* Port B: USART3 */
GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_4);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_4);
}
usart.c
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Baud rate */
uint32_t bd = 9600;
void usart_init(void)
{
/* ##################### USART 1 ##################### */
/* USART GPIO Settings */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART Settings */
USART_InitStructure.USART_BaudRate = bd;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl =
USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
/* Enable USART because it's disabled in USART_Init */
USART_Cmd(USART1, ENABLE);
/* ##################### USART 2 ##################### */
/* ##################### USART 3 ##################### */
/* Disable USART3 in order to use SWAP */
USART_Cmd(USART3, DISABLE);
/* Swap TX and RX pins */
USART3->CR2 |= USART_CR2_SWAP;
/* Enable USART3 */
USART_Cmd(USART3, ENABLE);
/* USART GPIO Settings */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* USART Settings */
USART_InitStructure.USART_BaudRate = bd;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl =
USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART3, &USART_InitStructure);
/* Enable USART because it's disabled in USART_Init */
USART_Cmd(USART3, ENABLE);
/* Enable USART Interrupts */
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART3, USART_IT_TXE, ENABLE);
/* Enable external interrupts */
NVIC_InitStructure.NVIC_IRQChannel = USART3_8_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* ##################### USART 4 ##################### */
}
stm32f0xx_it.c
#include <main.h>
void USART3_8_IRQHandler(void)
{
char t[] = "U";
uint16_t byte = 0;
if (USART_GetFlagStatus(USART3, USART_FLAG_RXNE) != RESET) // Data reception
{
byte = USART_ReceiveData(USART3);
(*pRXD3).Buffer[(*pRXD3).wr] = byte;
(*pRXD3).wr = ((*pRXD3).wr + 1);
USART_SendData(USART1, t[0]);
USART_GetFlagStatus(USART3, USART_IT_ORE);
USART_ClearITPendingBit(USART3, USART_IT_RXNE);
}
return;
}
The USART_SendData bit is for communication with my PC, so I can see if I receive the letter U or more nonesense.
I have also checked the content of the DR register (by way of checking the Buffer I write its content to) of USART3 directly so I know the STM32F091 receives (or rather interperts) my GPS output wrong.
The GPS module uses a default baudrate of 9600 which I do not change.
Let me know if there's any additional info
After a lot of searching and the suggestions of everyone in the comments, I figured out that the System Clock was not set up properly.
The following pieces of code were necessary in addition to what was already in the 'clock_init'.
peripherals.c
/* Clock settings */
void clock_init(void)
{
....
/* Select System Clock to be HSI */
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);
/* Select USART clock source to be System Clock */
RCC_USARTCLKConfig(RCC_USART1CLK_SYSCLK);
RCC_USARTCLKConfig(RCC_USART3CLK_SYSCLK);
....
}
Thanks to everyone for the help.
I am using an STM32F100RB at the moment and I am trying to read a value from a potentiometer and to display it through the PWM signal. The problem I have is where I am connecting them I think. The PWM signal is generated through this code:
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)
{
}
The PWM output works fine, and it displays what it should display. The problem comes with the ADC, where something seems not to work as it should (the code is from the manufacturer website), and this is the full code.
#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);
}
I am combining those two parts of code at the point where I should divide the value that TIM_Pulse is assigned:
TIM_OCInitStructure.TIM_Pulse = (uint16_t)(Period / ADC1ConvertedValue[0]);
I am a newcome in the embedded programming, and I just started playing with this board and the goal I want to achieve is to set the Pulse length according to the potentiometer value.
Thank you in advance,
Alex.
The modified code looks like this:
#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
}
}
}
Thanks to #Olaf.
I have just started my adventures with STM32f407 Discovery board. I'm using latest stable release of CoIDE and using up to date toolchain/libraries.
I managed to write the following code in order to use USART1 from the board
int main(void){
GPIO_InitTypeDef GPIO_InitStructure; // Definicja struktury do inicjalizacji PINOW
USART_InitTypeDef USART_InitStructure;
// Initialize pins as alternating function
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
// Modify USART_InitStructure for non -default values , e.g.
// USART_InitStructure.USART_BaudRate = 38400;
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx|USART_Mode_Rx;
USART_Init(USART1 ,&USART_InitStructure);
USART_Cmd(USART1 , ENABLE);
while(1)
{
while (USART_GetFlagStatus(USART1 , USART_FLAG_TXE) == RESET);
USART1 ->DR = (uint16_t)(45 & 0x01FF);
Delay(0x3FFFFF);
}
}
Also I have made sure clock is configured correctly by setting HSE and other clock details
#if !defined (HSE_VALUE)
#define HSE_VALUE ((uint32_t)8000000) /*!< Value of the External oscillator in Hz */
#endif /* HSE_VALUE */
And also
/************************* PLL Parameters *************************************/
/* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL_M) * PLL_N */
#define PLL_M 8
#define PLL_N 336
/* SYSCLK = PLL_VCO / PLL_P */
#define PLL_P 2
/* USB OTG FS, SDIO and RNG Clock = PLL_VCO / PLLQ */
#define PLL_Q 7
/******************************************************************************/
In console I just receive garbage and I have made the following to make sure the setup is correct :
- Checked USB-RS232 converter
- Switched between converter and STM32 board
- Switched converter
- Generated code using STM32CubeMX to compare it and it seems consistent (logic wise of course :) )
From my beginner perspective it is kinda "showstopper" :( I cannnot seem to find a root cause of this
Any help would be appreciated
UPDATE 1 : In order to find root cause I have decided to try one of the other USART modules. Below is my code for USART3 and this one WORKS OUT OF THE BOX which would lead me to incorrect init of USART1 in the initial question ?
int main(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* Enable GPIO clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
/* Enable UART clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
/* Connect PXx to USARTx_Tx*/
GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3);
/* Connect PXx to USARTx_Rx*/
GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3);
/* Configure USART Tx as alternate function */
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure USART Rx as alternate function */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_Init(GPIOC, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
/* USART configuration */
USART_Init(USART3, &USART_InitStructure);
/* Enable USART */
USART_Cmd(USART3, ENABLE);
SysTick_Config(SystemCoreClock / 1000);
while(1)
{
for (int var = 45; var < 128; var++)
{
USART_SendData(USART3, var);
Delay_SysTick(500); // 1 sek
}
}
}
Resolution: After a lot of digging and trying multiple things it appears that USART1 would collide with USB components and there is capacitor which collides with the transmission link to answer on ST forums
I wish I would have found this somewhere in documentation before.
Hope this helps someone and thanks everyone for your assistance
USART1 on this board (TX pin) has capacitor which collides with traffic. It is mentioned on ST forums.
Garbage on terminal often is caused when the sender has a different baudrate than the receiver.
I am working with the following evaluation board: SZWB-sail, STM32f103VET6 KIT v3.1
I want to use the stm32f103 usart in synchronous mode, and I used
STM32F10x_StdPeriph_Lib_V3.5.0\Project\STM32F10x_StdPeriph_Examples\USART\Synchronous
I modified the code in an attempt to use USART2/SPI1, as opposed to the working code provided via STMicro, which uses USART1/SPI1.
The README for this example states that:
"USARTy and SPIy can be USART1 and SPI1 or USART2 and SPI3, depending on the STMicroelectronics EVAL board you are using."
Despite this, I attempted to physically connect USART2 Tx/Rx/Ck pins (PA2,PA3,PA4) to SPI1 SCK/MISO/MOSI (PA5,PA6,PA7). Is there a software reason for why this won't work? Or might it be hardware connections on the eval board?
Here is my code:
int main(void)
{
SystemInit();
Init_NVIC();
/* System Clocks Configuration */
RCC_Configuration();
/* Configure the GPIO ports */
GPIO_Configuration();
SPI_Configuration();
USART_Configuration();
while(NbrOfDataToRead2--)
{
USART2_Send_Byte(TxBuffer1[TxCounter1++]);
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET)
{
}
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)
{
}
RxBuffer2[RxCounter2++] = SPI_I2S_ReceiveData(SPI1);
}
USART2_Receive_Byte();
while(NbrOfDataToRead1--)
{
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)== RESET)
{
}
SPI_I2S_SendData(SPI1, TxBuffer2[TxCounter2++]);
USART2_Send_Byte(DYMMY_BYTE);
while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET)
{
}
while(USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET)
{
}
RxBuffer1[RxCounter1++] = USART2_Receive_Byte();
}
TransferStatus1 = Buffercmp(TxBuffer1, RxBuffer2, TxBufferSize1);
TransferStatus2 = Buffercmp(TxBuffer2, RxBuffer1, TxBufferSize2);
while(1)
{
}
}
void Init_NVIC(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void RCC_Configuration(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE );
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 , ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 , ENABLE);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure1,GPIO_InitStructure2;
GPIO_InitTypeDef GPIO_InitStructure3,GPIO_InitStructure4,GPIO_InitStructure5,GPIO_InitStructure6;
/* Configure USART1 Rx as input floating */
GPIO_InitStructure1.GPIO_Pin =GPIO_Pin_10;
GPIO_InitStructure1.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure1.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure1);
/* Configure USART1 Tx as alternate function push-pull */
GPIO_InitStructure2.GPIO_Pin =GPIO_Pin_9;
GPIO_InitStructure2.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure2.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure2);
/* Configure USART2 Rx as input floating */
GPIO_InitStructure3.GPIO_Pin =GPIO_Pin_3;
GPIO_InitStructure3.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure3.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure3);
/* Configure USART2 Tx as alternate function push-pull */
GPIO_InitStructure4.GPIO_Pin =GPIO_Pin_2;
GPIO_InitStructure4.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure4.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure4);
/* Configure USART2 Ck as alternate function push-pull */
GPIO_InitStructure5.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure5.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure5.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure5);
/* Configure SPI1 pins: SCK, MISO and MOSI */
GPIO_InitStructure6.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_Init(GPIOA, &GPIO_InitStructure6);
}
void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure1,USART_InitStructure2;
USART_ClockInitTypeDef USART_ClkInitStructure;
USART_InitStructure1.USART_BaudRate = 115200;
USART_InitStructure1.USART_WordLength =USART_WordLength_8b ;
USART_InitStructure1.USART_StopBits = USART_StopBits_1;
USART_InitStructure1.USART_Parity = USART_Parity_No;
USART_InitStructure1.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure1.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
/* Configure USART1 */
USART_Init(USART1,&USART_InitStructure1);
//USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
/* Enable the USART1 */
USART_Cmd(USART1,ENABLE);
USART_ClkInitStructure.USART_Clock=USART_Clock_Enable;
USART_ClkInitStructure.USART_CPOL=USART_CPOL_High;
USART_ClkInitStructure.USART_CPHA=USART_CPHA_2Edge;
USART_ClkInitStructure.USART_LastBit=USART_LastBit_Enable;
USART_ClockInit(USART2, &USART_ClkInitStructure);
USART_InitStructure2.USART_BaudRate = 115200;
USART_InitStructure2.USART_WordLength =USART_WordLength_8b ;
USART_InitStructure2.USART_StopBits = USART_StopBits_1;
USART_InitStructure2.USART_Parity = USART_Parity_No;
USART_InitStructure2.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure2.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
/* Configure USART2 */
USART_Init(USART2,&USART_InitStructure2);
//USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);
/* Enable the USART2 */
USART_Cmd(USART2,ENABLE);
}
void SPI_Configuration(void)
{
SPI_InitTypeDef SPI_InitStructure;
SPI_StructInit(&SPI_InitStructure);
SPI_I2S_DeInit(SPI1);
/* SPIy Config */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;
/* Configure SPIy */
SPI_Init(SPI1, &SPI_InitStructure);
SPI_I2S_ITConfig(SPI1,SPI_I2S_IT_RXNE,ENABLE);
/* SPIy enable */
SPI_Cmd(SPI1, ENABLE);
}
You are mixing polling mode with interrupt mode. This SPI configuration code is intended for SPI interrupt mode. Hence, SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) should not be used, because this is a function intended for Polling-Mode.
Instead, I believe you can use SPI_I2S_GetITStatus(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT); in conjunction with SPI_I2S_ReceiveData(SPI_TypeDef* SPIx) and SPI_I2S_ClearITPendingBit(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT) (to clear any potential Error pending bits, just in-case).
Also, you might want to post your USART2_Send_Byte() code so we know what exactly it's doing, and whether it's calling any other functions...but go ahead and try this first to see if it fixes your problem.
SPI1 conflicts with USART2 synchronization mode.
SPI2 conflicts with USART3 synchronization mode.
There is no conflict between SPI1/2 and USART1 synchronization modes.
Hello I have got "stm32f10x open107V development board" ,I have modified the code for PWM which was given by the manufacturer ,but I am not getting any PWM output on leds given on development board please anybody help with for the following code.
GPIO_pins 0,1,14,15 on portB(GPIOB) are Led pins given on development board.The code is error free and has no errors while linking.As I was begginer I don't understand the what is the problem.
/**
-----------------------------------------------------------------*/
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_tim.h"
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
uint16_t CCR1_Val = 333;
uint16_t CCR2_Val = 249;
uint16_t CCR3_Val = 166;
uint16_t CCR4_Val = 83;
uint16_t PrescalerValue ;
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
/* Private functions ---------------------------------------------------------*/
/**
int main(void)
{
RCC_Configuration();
/*GPIO Configuration */
GPIO_Configuration();
PrescalerValue =(72000000 / 24000000) - 1;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 665;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 4;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
/* PWM1 Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
/* PWM1 Mode configuration: Channel3 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR3_Val;
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);
/* TIM3 enable counter */
TIM_Cmd(TIM3, ENABLE);
while (1)
{}
}
void RCC_Configuration(void)
{
/* TIM3 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
/* GPIOA and GPIOB clock enable */
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/*GPIOB Configuration: TIM3 channel1, 2, 3 and 4 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_14|GPIO_Pin_15 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE);
}
First of all, if you check on the STM32F107 datasheet (that's the MCU I assume that you have), the PB0 and PB1 pins can be mapped to TIM3_CH3 and TIM3_CH4, but PB14 and PB15 can't be mapped to any TIM3 channels -- only to TIM1 channels. See Table 5 on Section 3, for my version of the datasheet at least.
Second, you're using the AFIO remap feature, given the call to GPIO_PinRemapConfig(). The two pins that are indeed connected to the LEDs (PB0 and PB1) don't need a remap, while the other two (PB14 and PB15) can't be remapped to TIM3 channels no matter what you do.
Concretely, you can get PWM outputs on two pins (PB0 and PB1) with minimal code changes by just doing away with the call to GPIO_PinRemapConfig(). As for PB14 and PB15, you'll need to configure TIM1 which is going to need a lot of extra code. Unfortunately, there's just nothing you can do to map those pins to TIM3.