STM32 红外遥控,控制格力空调疑问

wenwubie · 发表于 2014-2-9 15:22:11

我使用的是STM32F373CC这个芯片来做红外遥控.选用的是TIM2_CH3(PA2)作为Ir_Out.
第一步,测出格力空调遥控器(型号为:YAD0F1)控制波形如右图(这个是部分的波形),所有的数据解码来如下:
引导码(9ms+4.5ms) 001111001010000000000100000010100100 间隔20ms 000000000000010000000000000010110 间隔40ms 引导码(9ms+4.5ms) 001111001010000000000100000011100100间隔20ms 000000000000000000001100000001110
以上是按一次遥控开命令所读到的所有数据.
第二步,使用STM32F373的TIM2_CH3发出38K HZ的载波,然后通过systick定时器来开关PWM的输出.输出波形如下:
发送的数据跟遥控解码的数据一模一样.
代码如下:
TIM2定时器配置

void TIM2_Config(void)

{

// u32 counter=0;

uint16_t CCR2_Val = 433;//433

uint16_t PrescalerValue = 0;

GPIO_InitTypeDef GPIO_InitStructure;

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;

/* TIM2 clock enable */

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

/* GPIOA clock enable */

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

/* GPIOA Configuration: TIM2 CH3 (PA2) */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

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_DOWN ;

GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Connect TIM2 pins to AF1 */

GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_1);

// PrescalerValue = (uint16_t) ((SystemCoreClock) / 38000000) - 1;

/* Time base configuration */

TIM_TimeBaseStructure.TIM_Period = 1314;//1314

TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;

TIM_TimeBaseStructure.TIM_ClockDivision = 0;

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

/* PWM1 Mode configuration: Channel2 */

TIM_OCInitStructure.TIM_OCIdleState=TIM_OCIdleState_Reset;

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse = CCR2_Val;

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

TIM_OC3Init(TIM2, &TIM_OCInitStructure);

TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Disable);

TIM_ARRPreloadConfig(TIM2, ENABLE);

/* TIM2 enable counter */

TIM_Cmd(TIM2, ENABLE);

TIM_CtrlPWMOutputs(TIM2, ENABLE);

// TIM_SetCompare1(TIM2,625);

}

IO口(PA2)模式切换

void ModeChange(u32 mode)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

if(mode==PWM)

{

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

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_DOWN;

GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_1);

}

else

{

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;

GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_ResetBits(GPIOA,GPIO_Pin_2);

}

代码发送函数

void Send_Code(TIM_TypeDef * TIMx)

{

BootCode(TIMx);

Logic_ZeroN(TIMx,2);

Logic_OneN(TIMx,4);

Logic_ZeroN(TIMx,2);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,1);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,10);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,6);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,1);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,2);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,2);

delay_ms(20);

Logic_ZeroN(TIMx,13);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,14);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,1);

Logic_OneN(TIMx,2);

Logic_ZeroN(TIMx,1);

delay_ms(40);

BootCode(TIMx);

Logic_ZeroN(TIMx,2);

Logic_OneN(TIMx,4);

Logic_ZeroN(TIMx,2);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,1);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,10);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,6);

Logic_OneN(TIMx,3);

Logic_ZeroN(TIMx,2);

Logic_OneN(TIMx,1);

Logic_ZeroN(TIMx,2);

delay_ms(20);

Logic_ZeroN(TIMx,20);

Logic_OneN(TIMx,2);

Logic_ZeroN(TIMx,7);

Logic_OneN(TIMx,3);

Logic_ZeroN(TIMx,1);

}

引导码及逻辑0和逻辑1函数

void BootCode(TIM_TypeDef * TIMx)

{

TIM_Cmd(TIMx, ENABLE);

// ModeChange(PWM);

delay_ms(9);

TIM_Cmd(TIMx, DISABLE);

// ModeChange(Low);

delay_us(4500);

}

void Logic_One(TIM_TypeDef * TIMx)

{

ModeChange(PWM);

TIM_Cmd(TIMx, ENABLE);

delay_us(565);//656

TIM_Cmd(TIMx, DISABLE);

ModeChange(Low);

delay_us(1695);//1640

}

void Logic_Zero(TIM_TypeDef * TIMx)

{

ModeChange(PWM);

TIM_Cmd(TIMx, ENABLE);

delay_us(565);//656

TIM_Cmd(TIMx, DISABLE);

ModeChange(Low);

delay_us(565);//544

}

void Logic_ZeroN(TIM_TypeDef * TIMx,u32 num)

{

u32 i=0;

for(;i<num;i++)

{

Logic_Zero(TIMx);

}

void Logic_OneN(TIM_TypeDef * TIMx,u32 num)

{

u32 i=0;

for(;i<num;i++)

{

Logic_One(TIMx);

}

}

最后疑问:
1.用试波器测出来的遥控波形为什么跟网上的波形不一致(我用STM32做的波形基本跟网上的差不多)
2.我的波形发出来后,无法控制空调(完全没反应).
请问以上是为什么?是我程序的问题,还是波形调制有问题?
请大侠帮忙指导了,弄了3周了,这个遥控器还没有出来.跪求指导,可加QQ79444528(layman).
万分感激.