STM8S003K3T6C使用定时器的PWM输出时该端口的GPIO怎么配置，请写出一个例子

STM8S003K3T6C是一款基于STM8微控制器的单片机，其GPIO（通用输入/输出）可以用于PWM（脉冲宽度调制）输出，例如通过TIMx定时器。要配置定时器生成PWM信号，通常需要以下几个步骤：

1. **选择定时器和通道**: TIM1或TIM2常用于PWM应用。这里以TIM1为例，假设我们想要使用其通道1。

2. **初始化定时器**:
- 首先，你需要在GPIO映射寄存器中设置TIM1的时钟源（如内部RC震荡器）。

   GPIO_InitTypeDef GPIO_InitStructure;
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; // TIM1 CH1对应于GPIOB的PB5
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // 推挽输出模式
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; // 设置速度为50 MHz
   GPIO_Init(GPIOB, &GPIO_InitStructure);

3. **配置TIM1**:
- 选择工作模式为PWM，并设置预分频器、计数器和捕获/比较寄存器。

   TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
   TIM_TimeBaseStructure.TIM_Prescaler = (SystemCoreClock / 16) - 1; // 根据系统时钟计算预分频值
   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // 上升计数
   TIM_TimeBaseStructure.TIM_Period = (uint16_t)(255); // PWM周期设为255个计数单位（取决于你的频率需求）
   TIM_TimeBaseStructure.TIM_ClockDivision = 0;
   TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
   TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

4. **配置TIM1的通道1**:
- 对于通道1，启用PWM输出和输出模式。

   TIM_OCInitTypeDef TIM_OCInitStructure;
   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; // PWM输出模式1
   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; // 开启输出
   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; // 输出高电平
   TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable; // 如果不需要负向PWM，则设置为禁用
   TIM_OC1Init(TIM1, &TIM_OCInitStructure);

5. **启动定时器**:

   TIM_Cmd(TIM1, ENABLE);

例子代码总结如下：

// ... 其他初始化代码

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

TIM_TimeBaseStructure.TIM_Prescaler = (SystemCoreClock / 16) - 1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 255;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);

TIM_Cmd(TIM1, ENABLE);