[ STM32F4-discovery开发板测评 ] 串行通讯测试及音频播放控制
<p align="left">STM32F4-discovery开发板配有相应的串口及例程资源，以例程UART_TwoBoards_ComPolling为例它可实现两板间的串行通讯。</p><p align="left" >若只有一个开发板，则可以通过串口模块与电脑相连来进行功能测试。</p>
<p align="left" >在默认情况下是处于开发板是处于接收方式，需解除注销该模式的设置，才能使其处于发送模式。</p>
<p align="left" >在开发板处于发送模式时，即设置定义语句为：</p>
<p align="left" >#define TRANSMITTER_BOARD</p>
<p align="left" >开发板与串口模块的连接关系为：</p>
<p align="left" >PA09----RXD</p>
<p align="left" >PA10----TXD</p>
<p align="left" > </p>
<p align="left" >此时，按蓝色按键即可发送信息，见图1所示。若不予以原文回应，则红灯亮；予以原文回传，见图2所示，则绿灯闪烁。</p>
<p align="left" > </p>
<p align="left">图1 接收发送信息</p>
<p align="left"> </p>
<p align="left"> </p>
<p align="left">图2 原文回应</p>
<p align="left" > </p>
<p align="left" >相应的主程序为：</p>
<pre>
<code class="language-cpp">int main(void)
{
HAL_Init();
BSP_LED_Init(LED3);
BSP_LED_Init(LED4);
SystemClock_Config();
UartHandle.Instance = USARTx;
UartHandle.Init.BaudRate = 9600;
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_NONE;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
if(HAL_UART_Init(&UartHandle) != HAL_OK)
{
Error_Handler();
}
#ifdef TRANSMITTER_BOARD
BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_GPIO);
while (BSP_PB_GetState(BUTTON_KEY) == RESET)
{
}
if(HAL_UART_Transmit(&UartHandle, (uint8_t*)aTxBuffer, TXBUFFERSIZE, 5000)!= HAL_OK)
{
Error_Handler();
}
BSP_LED_On(LED3);
HAL_Delay(200);
BSP_LED_Off(LED3);
if(HAL_UART_Receive(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE, 5000) != HAL_OK)
{
Error_Handler();
}
BSP_LED_On(LED3);
HAL_Delay(200);
BSP_LED_Off(LED3);
#else
if(HAL_UART_Receive(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE, 5000) != HAL_OK)
{
Error_Handler();
}
BSP_LED_On(LED3);
HAL_Delay(200);
BSP_LED_Off(LED3);
if(HAL_UART_Transmit(&UartHandle, (uint8_t*)aTxBuffer, TXBUFFERSIZE, 5000)!= HAL_OK)
{
Error_Handler();
}
BSP_LED_On(LED3);
HAL_Delay(200);
BSP_LED_Off(LED3);
#endif
if(Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,RXBUFFERSIZE))
{
Error_Handler();
}
while (1)
{
BSP_LED_Toggle(LED3);
HAL_Delay(40);
}
}
</code></pre>
<p align="left">以此为基础，在按键的配合下，通过发送指令则可以控制基于串口通信的语音播放模块。</p>
<p align="left"> </p>
<p align="left">图3 MP3模块</p>
<p align="left" > </p>
<p align="left" >在使用MP3模块时，除连接电源及扬声器之外，只需将MP3模块的RX引脚同PA9连接。</p>
<p align="left" >以串口控制MP3模块播放的主程序为：</p>
<pre>
<code class="language-cpp">int main(void)
{
uint8_t n=1;
HAL_Init();
BSP_LED_Init(LED3);
BSP_LED_Init(LED4);
SystemClock_Config();
UartHandle.Instance = USARTx;
UartHandle.Init.BaudRate = 9600;
UartHandle.Init.WordLength= UART_WORDLENGTH_8B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_NONE;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
if(HAL_UART_Init(&UartHandle) != HAL_OK)
{
Error_Handler();
}
while(1)
{
while (BSP_PB_GetState(BUTTON_KEY) == RESET);
n=n+1;
if(n>12) n=1;
playn(n);
HAL_UART_Transmit(&UartHandle, (uint8_t*)cmd3, 10, 5000);
HAL_Delay(300);
}
}
</code></pre>
<p>在进行测试时，以串口发送指令的形式如图4和图5所示。</p>
<p> </p>
<p align="left">图4 发送指令</p>
<p align="left"> </p>
<p align="left"> </p>
<p align="left">图5 播放测试</p>
<p align="left"> </p>
<p align="left"> </p>
<p>非常好的测试，学习了！</p>
Gen_X 发表于 2023-10-27 10:45
非常好的测试，学习了！
<p>感谢支持！！！</p>
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