【灵动微电子MM32F0121测评】2、串口输入输出及呼吸灯
本帖最后由 穿西装的强子 于 2025-6-13 22:32 编辑1、串口功能
参考例程USART_Interrupt例程进行移植由于该例程是usart2的，需要改为usart1。
将plartfrom.c和mm32f0120_it.c内容进行移植到我们工程内
plartfrom主要是串口输出功能，已经指向了printf，不需要自己再额外的修改了
唯一需要注意的是需要添加Use MicroLib功能
移植好了以后打印看输出结果
成功打印出“Hello 21ic, HelloMM32F0121”，还有主频等信息
只需要在主函数起始调用PLATFORM_Init();函数即可实现串口配置功能。
但是该串口只有打印没有接收功能，现在先将接收也移植进来。
在void PLATFORM_InitConsole(uint32_t Baudrate)函数内添加中断接收及接收引脚的配置。
配置代码如下
void PLATFORM_InitConsole(uint32_t Baudrate)
{
GPIO_InitTypeDef GPIO_InitStruct;
NVIC_InitTypeDefNVIC_InitStruct;
USART_InitTypeDef USART_InitStruct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
USART_StructInit(&USART_InitStruct);
USART_InitStruct.USART_BaudRate = Baudrate;
USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_InitStruct.USART_StopBits = USART_StopBits_1;
USART_InitStruct.USART_Parity = USART_Parity_No;
USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStruct);
RCC_AHBPeriphClockCmd(RCC_AHBENR_GPIOB, ENABLE);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_0);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_0);
GPIO_StructInit(&GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_High;
GPIO_InitStruct.GPIO_Mode= GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStruct);
GPIO_StructInit(&GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStruct.GPIO_Mode= GPIO_Mode_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStruct);
NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPriority = 0;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
USART_ITConfig(USART1, USART_IT_PE, ENABLE);
USART_ITConfig(USART1, USART_IT_ERR, ENABLE);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);
}串口中断增加接收函数，并通过串口回传（暂时只做串口回发）
void USART1_IRQHandler(void)
{
uint8_t RxData = 0;
if ((RESET != USART_GetITStatus(USART1, USART_IT_PE)) ||
(RESET != USART_GetITStatus(USART1, USART_IT_ERR)))
{
USART_ReceiveData(USART1);
}
if (RESET != USART_GetITStatus(USART1, USART_IT_RXNE))
{
RxData = USART_ReceiveData(USART1);
USART_SendData(USART1, RxData);
}
}串口打印和接收
2、PWM呼吸灯效果
根据原理图LED在PB14和PB15上
该引脚使用TIM1_CH1/CH3和TIM1_CH2两个引脚接了三个通道，我们只需要使用2个通道即可，就使用CH1和CH2
使用固件库的例程代码TIM1_PWM_Output进行移植
由于TIM1_PWM_Output代码内使用的是PB3/PB3/PB5，和LED引脚不匹配，因此需要修改改引脚，再将三通道改为两通道
再根据用户手册可知道，PB14和PB15使用TIM1的配置是AP7的功能，因此需要将
GPIO_PinAFConfig(GPIOB, GPIO_PinSource3,GPIO_AF_6); /* TIM1_CH1 */
GPIO_PinAFConfig(GPIOB, GPIO_PinSource4,GPIO_AF_6); /* TIM1_CH2 */
改为
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14,GPIO_AF_7); /* TIM1_CH1 */
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15,GPIO_AF_7); /* TIM1_CH2 */
GPIO的输出也配置为GPIO14和GPIO15
删除TIM_OC3Init的配置
代码如下
RCC_ClocksTypeDef RCC_Clocks;
GPIO_InitTypeDef GPIO_InitStruct;
TIM_OCInitTypeDef TIM_OCInitStruct;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
uint32_t TIM_ClockFrequency = 0;
uint32_t HPRE = 0, PPRE2 = 0;
uint32_t TimerPeriod = 0, Channel1Pulse = 0, Channel2Pulse = 0;
HPRE= READ_BIT(RCC->CFGR, RCC_CFGR_HPRE)>> RCC_CFGR_HPRE_Pos;
PPRE2 = READ_BIT(RCC->CFGR, RCC_CFGR_PPRE2) >> RCC_CFGR_PPRE2_Pos;
RCC_GetClocksFreq(&RCC_Clocks);
if (HPRE < 8)
{
if (PPRE2 < 4)
{
TIM_ClockFrequency = RCC_Clocks.PCLK1_Frequency;
}
else
{
TIM_ClockFrequency = RCC_Clocks.PCLK1_Frequency * 2;
}
}
else
{
if (PPRE2 < 4)
{
TIM_ClockFrequency = RCC_Clocks.PCLK1_Frequency * 2;
}
else
{
TIM_ClockFrequency = RCC_Clocks.PCLK1_Frequency * 4;
}
}
/* Compute the value to be set in ARR regiter to generate signal frequency at 100 Khz */
TimerPeriod = TIM_ClockFrequency / 100000;
/* Compute CCR1 value to generate a duty cycle at 75% for channel 1 */
Channel1Pulse = (uint32_t)1000 * TimerPeriod / 1000;
/* Compute CCR2 value to generate a duty cycle at 50% for channel 2 */
Channel2Pulse = (uint32_t)0 * TimerPeriod / 1000;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
TIM_TimeBaseStructInit(&TIM_TimeBaseInitStruct);
TIM_TimeBaseInitStruct.TIM_Prescaler = 0;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStruct.TIM_Period = TimerPeriod;
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_Div1;
TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStruct);
TIM_OCStructInit(&TIM_OCInitStruct);
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStruct.TIM_OutputState= TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_Pulse = 0;
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStruct.TIM_OCIdleState= TIM_OCIdleState_Set;
TIM_OCInitStruct.TIM_Pulse = Channel1Pulse;
TIM_OC1Init(TIM1, &TIM_OCInitStruct);
TIM_OCInitStruct.TIM_Pulse = Channel2Pulse;
TIM_OC2Init(TIM1, &TIM_OCInitStruct);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14,GPIO_AF_7); /* TIM1_CH1 */
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15,GPIO_AF_7); /* TIM1_CH2 */
GPIO_StructInit(&GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_14 | GPIO_Pin_15 ;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_High;
GPIO_InitStruct.GPIO_Mode= GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStruct);
TIM_Cmd(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);在主函数控制LED的呼吸效果
int main(void)
{
uint32_t i = 0;
PLATFORM_Init();
// GPIO_LED_Toggle_Sample();
TIM1_PWM_Output_Sample();
printf("\r\nHello 21ic, HelloMM32F0121");
while (1)
{
TIM1->CCR1 = 1440 - (i++%1440);
TIM1->CCR2 = (i++%1440);
PLATFORM_DelayMS(2);
}
}
视频效果如下
https://www.bilibili.com/video/BV1xQMqzQEek/
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