Estoy utilizando el convertidor USB-TTL (chip PL-2303 XA / HXA) para establecer una comunicación en serie entre la placa STM32L476G-Eval y mi computadora portátil. No encontré dónde conectar los cables de TX y RX en la placa de evaluación porque los pines son más pequeños que los cables, por lo que los conecté directamente al conector DB9
FijéquelavelocidadenbaudiosyotrainformacióneranigualestantoenelportátilcomoenelbaordyuséunejemplodecubeMxparaprobarlacomunicaciónatravésdeUART:
/*********************************************************************************@fileUART/UART_HyperTerminal_DMA/Src/main.c*@authorMCDApplicationTeam*@briefThissamplecodeshowshowtouseUARTHALAPItotransmit*andreceiveadatabufferwithacommunicationprocessbasedon*DMAtransfer.*ThecommunicationisdonewiththeHyperterminalPCapplication.*******************************************************************************@attention**<h2><center>©COPYRIGHT(c)2017STMicroelectronics</center></h2>**Redistributionanduseinsourceandbinaryforms,withorwithoutmodification,*arepermittedprovidedthatthefollowingconditionsaremet:*1.Redistributionsofsourcecodemustretaintheabovecopyrightnotice,*thislistofconditionsandthefollowingdisclaimer.*2.Redistributionsinbinaryformmustreproducetheabovecopyrightnotice,*thislistofconditionsandthefollowingdisclaimerinthedocumentation*and/orothermaterialsprovidedwiththedistribution.*3.NeitherthenameofSTMicroelectronicsnorthenamesofitscontributors*maybeusedtoendorseorpromoteproductsderivedfromthissoftware*withoutspecificpriorwrittenpermission.**THISSOFTWAREISPROVIDEDBYTHECOPYRIGHTHOLDERSANDCONTRIBUTORS"AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stdio.h"
/** @addtogroup STM32L4xx_HAL_Examples
* @{
*/
/** @addtogroup UART_Hyperterminal_DMA
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* UART handler declaration */
UART_HandleTypeDef UartHandle;
/* Buffer used for transmission */
uint8_t aTxBuffer[] = "\n\r ****UART-Hyperterminal communication based on DMA****\n\r Enter 10 characters using keyboard :\n\r";
/* Buffer used for reception */
uint8_t aRxBuffer[RXBUFFERSIZE];
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void Error_Handler(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* STM32L4xx HAL library initialization:
- Configure the Flash prefetch
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to 80 MHz */
SystemClock_Config();
/* Configure LED1, LED2 and LED3 */
BSP_LED_Init(LED1);
BSP_LED_Init(LED2);
BSP_LED_Init(LED3);
/*##-1- Configure the UART peripheral ######################################*/
/* Put the USART peripheral in the Asynchronous mode (UART Mode) */
/* UART configured as follows:
- Word Length = 8 Bits
- Stop Bit = One Stop bit
- Parity = ODD parity
- BaudRate = 9600 baud
- Hardware flow control disabled (RTS and CTS signals) */
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;
if (HAL_UART_Init(&UartHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/*##-2- Start the transmission process #####################################*/
/* User start transmission data through "TxBuffer" buffer */
if (HAL_UART_Transmit_DMA(&UartHandle, (uint8_t *)aTxBuffer, TXBUFFERSIZE) != HAL_OK)
{
/* Transfer error in transmission process */
Error_Handler();
}
/*##-3- Put UART peripheral in reception process ###########################*/
/* Any data received will be stored in "RxBuffer" buffer : the number max of
data received is 10 */
if (HAL_UART_Receive_DMA(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK)
{
/* Transfer error in reception process */
Error_Handler();
}
/*##-4- Wait for the end of the transfer ###################################*/
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it’s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_UART_GetState(&UartHandle) != HAL_UART_STATE_READY)
{
}
/*##-5- Send the received Buffer ###########################################*/
if (HAL_UART_Transmit_DMA(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK)
{
/* Transfer error in transmission process */
Error_Handler();
}
/*##-6- Wait for the end of the transfer ###################################*/
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it’s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_UART_GetState(&UartHandle) != HAL_UART_STATE_READY)
{
}
/* Infinite loop */
while (1)
{
}
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follows :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 80000000
* HCLK(Hz) = 80000000
* AHB Prescaler = 1
* APB1 Prescaler = 1
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 1
* PLL_N = 20
* PLL_P = 7
* PLL_Q = 4
* PLL_R = 2
* Flash Latency(WS) = 4
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
/* Enable HSE Oscillator and activate PLL with HSE as source */
/* (Default MSI Oscillator enabled at system reset remains ON) */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 1;
RCC_OscInitStruct.PLL.PLLN = 20;
RCC_OscInitStruct.PLL.PLLR = 2;
RCC_OscInitStruct.PLL.PLLP = 7;
RCC_OscInitStruct.PLL.PLLQ = 4;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
/* Initialization Error */
while(1);
}
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
{
/* Initialization Error */
while(1);
}
}
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
static void Error_Handler(void)
{
/* Turn LED3 on */
BSP_LED_On(LED3);
while(1)
{
}
}
/**
* @brief Tx Transfer completed callback
* @param huart: UART handle.
* @note This example shows a simple way to report end of DMA Tx transfer, and
* you can add your own implementation.
* @retval None
*/
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
/* Turn LED1 on: Transfer in transmission process is correct */
BSP_LED_On(LED1);
}
/**
* @brief Rx Transfer completed callback
* @param huart: UART handle
* @note This example shows a simple way to report end of DMA Rx transfer, and
* you can add your own implementation.
* @retval None
*/
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
/* Turn LED2 on: Transfer in reception process is correct */
BSP_LED_On(LED2);
}
/**
* @brief UART error callbacks
* @param huart: UART handle
* @note This example shows a simple way to report transfer error, and you can
* add your own implementation.
* @retval None
*/
void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart)
{
/* Turn LED3 on: Transfer error in reception/transmission process */
BSP_LED_On(LED3);
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(char *file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
Recibí algo como esto:
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¿Esto se debe a que conecté directamente los cables TX y RX al conector DB9?