用DMA方式实现STM32单片机串口数据发送

/** ****************************************************************************** * @file stm32f0xx_hal_tim.c * @author MCD Application Team * @brief TIM HAL module driver. * This file provides firmware functions to manage the following * functionalities of the Timer (TIM) peripheral: * + Time Base Initialization * + Time Base Start * + Time Base Start Interruption * + Time Base Start DMA * + Time Output Compare/PWM Initialization * + Time Output Compare/PWM Channel Configuration * + Time Output Compare/PWM Start * + Time Output Compare/PWM Start Interruption * + Time Output Compare/PWM Start DMA * + Time Input Capture Initialization * + Time Input Capture Channel Configuration * + Time Input Capture Start * + Time Input Capture Start Interruption * + Time Input Capture Start DMA * + Time One Pulse Initialization * + Time One Pulse Channel Configuration * + Time One Pulse Start * + Time Encoder Interface Initialization * + Time Encoder Interface Start * + Time Encoder Interface Start Interruption * + Time Encoder Interface Start DMA * + Commutation Event configuration with Interruption and DMA * + Time OCRef clear configuration * + Time External Clock configuration @verbatim ============================================================================== ##### TIMER Generic features ##### ============================================================================== [..] The Timer features include: (#) 16-bit up, down, up/down auto-reload counter. (#) 16-bit programmable prescaler allowing dividing (also on the fly) the counter clock frequency either by any factor between 1 and 65536. (#) Up to 4 independent channels for: (++) Input Capture (++) Output Compare (++) PWM generation (Edge and Center-aligned Mode) (++) One-pulse mode output ##### How to use this driver ##### ============================================================================== [..] (#) Initialize the TIM low level resources by implementing the following functions depending from feature used : (++) Time Base : HAL_TIM_Base_MspInit() (++) Input Capture : HAL_TIM_IC_MspInit() (++) Output Compare : HAL_TIM_OC_MspInit() (++) PWM generation : HAL_TIM_PWM_MspInit() (++) One-pulse mode output : HAL_TIM_OnePulse_MspInit() (++) Encoder mode output : HAL_TIM_Encoder_MspInit() (#) Initialize the TIM low level resources : (##) Enable the TIM interface clock using __HAL_RCC_TIMx_CLK_ENABLE(); (##) TIM pins configuration (+++) Enable the clock for the TIM GPIOs using the following function: __HAL_RCC_GPIOx_CLK_ENABLE(); (+++) Configure these TIM pins in Alternate function mode using HAL_GPIO_Init(); (#) The external Clock can be configured, if needed (the default clock is the internal clock from the APBx), using the following function: HAL_TIM_ConfigClockSource, the clock configuration should be done before any start function. (#) Configure the TIM in the desired functioning mode using one of the Initialization function of this driver: (++) HAL_TIM_Base_Init: to use the Timer to generate a simple time base (++) HAL_TIM_OC_Init and HAL_TIM_OC_ConfigChannel: to use the Timer to generate an Output Compare signal. (++) HAL_TIM_PWM_Init and HAL_TIM_PWM_ConfigChannel: to use the Timer to generate a PWM signal. (++) HAL_TIM_IC_Init and HAL_TIM_IC_ConfigChannel: to use the Timer to measure an external signal. (++) HAL_TIM_OnePulse_Init and HAL_TIM_OnePulse_ConfigChannel: to use the Timer in One Pulse Mode. (++) HAL_TIM_Encoder_Init: to use the Timer Encoder Interface. (#) Activate the TIM peripheral using one of the start functions depending from the feature used: (++) Time Base : HAL_TIM_Base_Start(), HAL_TIM_Base_Start_DMA(), HAL_TIM_Base_Start_IT() (++) Input Capture : HAL_TIM_IC_Start(), HAL_TIM_IC_Start_DMA(), HAL_TIM_IC_Start_IT() (++) Output Compare : HAL_TIM_OC_Start(), HAL_TIM_OC_Start_DMA(), HAL_TIM_OC_Start_IT() (++) PWM generation : HAL_TIM_PWM_Start(), HAL_TIM_PWM_Start_DMA(), HAL_TIM_PWM_Start_IT() (++) One-pulse mode output : HAL_TIM_OnePulse_Start(), HAL_TIM_OnePulse_Start_IT() (++) Encoder mode output : HAL_TIM_Encoder_Start(), HAL_TIM_Encoder_Start_DMA(), HAL_TIM_Encoder_Start_IT(). (#) The DMA Burst is managed with the two following functions: HAL_TIM_DMABurst_WriteStart() HAL_TIM_DMABurst_ReadStart() @endverbatim ****************************************************************************** * @attention * * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2> * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of STMicroelectronics nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 "stm32f0xx_hal.h" /** @addtogroup STM32F0xx_HAL_Driver * @{ */ /** @defgroup TIM TIM * @brief TIM HAL module driver * @{ */ #ifdef HAL_TIM_MODULE_ENABLED /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ /** @defgroup TIM_Private_Functions TIM_Private_Functions * @{ */ static void TIM_OC1_SetConfig(TIM_TypeDef *TIMx, TIM_OC_InitTypeDef *OC_Config); static void TIM_OC3_SetConfig(TIM_TypeDef *TIMx, TIM_OC_InitTypeDef *OC_Config); static void TIM_OC4_SetConfig(TIM_TypeDef *TIMx