基于RC522（FM1702）读卡设备

/** ****************************************************************************** * @file stm32f0xx_usart.c * @author MCD Application Team * @version V1.1.1 * @date 31-July-2013 * @brief This file provides firmware functions to manage the following * functionalities of the Universal synchronous asynchronous receiver * transmitter (USART): * + Initialization and Configuration * + STOP Mode * + AutoBaudRate * + Data transfers * + Multi-Processor Communication * + LIN mode * + Half-duplex mode * + Smartcard mode * + IrDA mode * + RS485 mode * + DMA transfers management * + Interrupts and flags management * * @verbatim =============================================================================== ##### How to use this driver ##### =============================================================================== [..] (#) Enable peripheral clock using RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE) function for USART1 or using RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE) function for USART2 and USART3. (#) According to the USART mode, enable the GPIO clocks using RCC_AHBPeriphClockCmd() function. (The I/O can be TX, RX, CTS, or and SCLK). (#) Peripheral's alternate function: (++) Connect the pin to the desired peripherals' Alternate Function (AF) using GPIO_PinAFConfig() function. (++) Configure the desired pin in alternate function by: GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF. (++) Select the type, pull-up/pull-down and output speed via GPIO_PuPd, GPIO_OType and GPIO_Speed members. (++) Call GPIO_Init() function. (#) Program the Baud Rate, Word Length , Stop Bit, Parity, Hardware flow control and Mode(Receiver/Transmitter) using the SPI_Init() function. (#) For synchronous mode, enable the clock and program the polarity, phase and last bit using the USART_ClockInit() function. (#) Enable the NVIC and the corresponding interrupt using the function USART_ITConfig() if you need to use interrupt mode. (#) When using the DMA mode: (++) Configure the DMA using DMA_Init() function. (++) Active the needed channel Request using USART_DMACmd() function. (#) Enable the USART using the USART_Cmd() function. (#) Enable the DMA using the DMA_Cmd() function, when using DMA mode. [..] Refer to Multi-Processor, LIN, half-duplex, Smartcard, IrDA sub-sections for more details. @endverbatim ****************************************************************************** * @attention * * <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2> * * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License"); * You may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.st.com/software_license_agreement_liberty_v2 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "stm32f0xx_usart.h" #include "stm32f0xx_rcc.h" /** @addtogroup STM32F0xx_StdPeriph_Driver * @{ */ /** @defgroup USART * @brief USART driver modules * @{ */ /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /*!< USART CR1 register clear Mask ((~(uint32_t)0xFFFFE6F3)) */ #define CR1_CLEAR_MASK ((uint32_t)(USART_CR1_M | USART_CR1_PCE | \ USART_CR1_PS | USART_CR1_TE | \ USART_CR1_RE)) /*!< USART CR2 register clock bits clear Mask ((~(uint32_t)0xFFFFF0FF)) */ #define CR2_CLOCK_CLEAR_MASK ((uint32_t)(USART_CR2_CLKEN | USART_CR2_CPOL | \ USART_CR2_CPHA | USART_CR2_LBCL)) /*!< USART CR3 register clear Mask ((~(uint32_t)0xFFFFFCFF)) */ #define CR3_CLEAR_MASK ((uint32_t)(USART_CR3_RTSE | USART_CR3_CTSE)) /*!< USART Interrupts mask */ #define IT_MASK ((uint32_t)0x000000FF) /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ /* Private functions ---------------------------------------------------------*/ /** @defgroup USART_Private_Functions * @{ */ /** @defgroup USART_Group1 Initialization and Configuration functions * @brief Initialization and Configuration functions * @verbatim =============================================================================== ##### Initialization and Configuration functions ##### =============================================================================== [..] This subsection provides a set of functions allowing to initialize the USART in asynchronous and in synchronous modes. (+) For the asynchronous mode only these parameters can be configured: (++) Baud Rate. (++) Word Length. (++) Stop Bit. (++) Parity: If the parity is enabled, then the MSB bit of the data written in the data register is transmitted but is changed by the parity bit. Depending on the frame length defined by the M bit (8-bits or 9-bits), the possible USART frame formats are as listed in the following table: +-------------------------------------------------------------+ | M bit | PCE bit | USART frame | |---------------------|---------------------------------------| | 0 | 0 | | SB | 8 bit data | STB | | |---------|-----------|---------------------------------------| | 0 | 1 | | SB | 7 bit data | PB | STB | | |---------|-----------|---------------------------------------| | 1 | 0 | | SB | 9 bit data | STB | | |---------|-----------|---------------------------------------| | 1 | 1 | | SB | 8 bit data | PB | STB | | +-------------------------------------------------------------+ (++) Hardware flow control. (++) Receiver/transmitter modes. [..] The USART_Init() function follows the USART asynchronous configuration procedure(details for the procedure are available in reference manual. (+) For the synchronous mode in addition to the asynchronous mode parameters these parameters should be also configured: (++) USART Clock Enabled. (++) USART polarity. (++) USART phase. (++) USART LastBit. [..] These parameters can be configured using the USART_ClockInit() function. @endverbatim * @{ */ /** * @brief Deinitializes the USARTx peripheral registers to their