stm32 pwm控制的跑马灯视频（视频有点长）：
PWM控制呼吸灯的代码：
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32_eval.h"
#include
#define VREF 3.3
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
void RCC_Configuration(void)
{/*
RCC_DeInit();
RCC_HSICmd(ENABLE);
while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET);
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);
RCC_HSEConfig(RCC_HSE_OFF);
RCC_LSEConfig(RCC_LSE_OFF);
RCC_PLLConfig(RCC_PLLSource_HSI_Div2,RCC_PLLMul_9); // 72HMz
RCC_PLLCmd(ENABLE);
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
RCC_ADCCLKConfig(RCC_PCLK2_Div4);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
while(RCC_GetSYSCLKSource() != 0x08);
*/
SystemInit();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);//disable JTAG
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);//disable JTAG
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_ResetBits(GPIOD,GPIO_Pin_2);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);//disable JTAG
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_SetBits(GPIOC,GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
}
void USART_int(long BaudRate)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* PA10 USART1_Rx */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = BaudRate;//??????
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//???????8bit
USART_InitStructure.USART_StopBits = USART_StopBits_1;//????1
USART_InitStructure.USART_Parity = USART_Parity_No;//????
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//??????none
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//??????????
USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_ClockInit(USART1, &USART_ClockInitStructure);
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);
}
void PWM_Config()
{uint16_t PrescalerValue = 0;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* GPIOA enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO , ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_Cmd(TIM2, ENABLE);
/* Compute the prescaler value */
PrescalerValue = (uint16_t) (SystemCoreClock / 24000000) - 1;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 0x07FF;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
/* PWM1 Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0xFFFF;
TIM_OC2Init(TIM2, &TIM_OCInitStructure);
/* PWM1 Mode configuration: Channel3 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0xFFFF;
TIM_OC3Init(TIM2, &TIM_OCInitStructure);
/* PWM1 Mode configuration: Channel4 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0xFFFF;
TIM_OC4Init(TIM2, &TIM_OCInitStructure);
TIM_ARRPreloadConfig(TIM2, ENABLE);
}
void delay_us(u32 n)
{
u8 j;
while(n--)
for(j=0;j<10;j++);
}
void delay_ms(u32 n)
{
while(n--)
delay_us(1000);
}
void PWM_TEST()
{ unsigned int temp0=0,temp1=0,temp2=0;
printf("PWM-RGB TEST......\r\n");
while(1)
{
for(temp0=0;temp0<2047;temp0++)
{
TIM_SetCompare2(TIM2, temp0);
delay_us(1000);
}
if (temp0>=2047)
{
delay_ms(2000);
temp0=0;
}
for(temp1=1;temp1<2047;temp1++)
{
TIM_SetCompare3(TIM2, temp1);
delay_us(1000);
}
if (temp1>=2047)
{
delay_ms(2000);
temp1=0;
}
for(temp2=0;temp2<2047;temp2++)
{
TIM_SetCompare4(TIM2, temp2);
delay_us(1000);
}
if (temp2>=2047)
{
delay_ms(2000);
temp2=0;
}
for(temp0=0,temp1=0;temp0<2047||temp1<2047;temp0++,temp1++)
{
TIM_SetCompare2(TIM2, temp0);
TIM_SetCompare3(TIM2, temp1);
delay_us(1000);}
if (temp0>=2047)
{
delay_ms(2000);
temp0=0;
}
if (temp1>=2047)
{
delay_ms(2000);
temp1=0;
}
for(temp0=0,temp2=0;temp0<2047||temp2<2047;temp0++,temp2++)
{
TIM_SetCompare2(TIM2, temp0);
TIM_SetCompare4(TIM2, temp2);
delay_us(1000);}
if (temp0>=2047)
{
delay_ms(2000);
temp0=0;
}
if (temp2>=2047)
{
delay_ms(2000);
temp2=0;
}
for(temp1=0,temp2=0;temp1<2047||temp2<2047;temp1++,temp2++)
{
TIM_SetCompare3(TIM2, temp1);
TIM_SetCompare4(TIM2, temp2);
delay_us(1000);}
if (temp1>=2047)
{
delay_ms(2000);
temp1=0;
}
if (temp2>=2047)
{
delay_ms(2000);
temp2=0;
}
for(temp0=0,temp1=0,temp2=0;temp0<2047||temp1<2047||temp2<2047;temp0++,temp1++,temp2++)
{
TIM_SetCompare3(TIM2, temp1);
TIM_SetCompare2(TIM2, temp0);
TIM_SetCompare4(TIM2, temp2);
delay_us(1000);}
if (temp0>=2047)
{
delay_ms(2000);
temp0=0;
}
if (temp1>=2047)
{
delay_ms(2000);
temp1=0;
}
if (temp2>=2047)
{
delay_ms(2000);
temp2=0;
}
}
}
int main(void)
{
RCC_Configuration();
USART_int(115200);
printf(" config done...\r\n");
PWM_Config();
delay_ms(1000);
while(1)
{
PWM_TEST();
}
}
#ifdef USE_FULL_ASSERT
void assert_failed(uint8_t* file, uint32_t line)
{
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
#ifdef __GNUC__
/* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
set to 'Yes') calls __io_putchar() */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
/**
* @brief Retargets the C library printf function to the USART.
* @param None
* @retval None
*/
PUTCHAR_PROTOTYPE
{
/* Place your implementation of fputc here */
/* e.g. write a character to the USART */
USART_SendData(EVAL_COM1, (uint8_t) ch);
/* Loop until the end of transmission */
while (USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TC) == RESET)
{}
return ch;
}
#ifdef USE_FULL_ASSERT
void assert_failed(uint8_t* file, uint32_t line)
{
while (1)
{
}
}
#endif
/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
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