#include "stm32f10x.h"

#include "stm32f10x_spi.h"

#include "stm32f10x_gpio.h"

#include "stm32f10x_rcc.h"

#include "delay.h"

#include "mfrc522.h"

#include "stdio.h"

#define     SPI_CE_LOW()      GPIO_ResetBits(GPIOA,GPIO_Pin_4)

#define     SPI_CE_HIGH()     GPIO_SetBits(GPIOA,GPIO_Pin_4)

void SPI1_Init(void)

{

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;      

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    SPI_InitTypeDef SPI_InitStructure;

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;

    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;

    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;

    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

    SPI_InitStructure.SPI_CRCPolynomial = 7;

    SPI_Init(SPI1, &SPI_InitStructure);

    SPI_Cmd(SPI1, ENABLE);

}

uint8_t SPI1_SendByte(uint8_t byte)

{

    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

    SPI_I2S_SendData(SPI1, byte);

    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) ==

RESET); return SPI_I2S_ReceiveData(SPI1); }

void MFRC522_Reset(void) { SPI_CE_LOW(); SPI1_SendByte(0x1B); SPI_CE_HIGH(); }

uint8_t MFRC522_ReadRegister(uint8_t addr) { SPI_CE_LOW(); uint8_t data; SPI1_SendByte(0x80 | addr); data = SPI1_SendByte(0x00); SPI_CE_HIGH(); return data; }

void MFRC522_WriteRegister(uint8_t addr, uint8_t val) { SPI_CE_LOW(); SPI1_SendByte(0x7F & addr); SPI1_SendByte(val); SPI_CE_HIGH(); }

void MFRC522_ReadRegisters(uint8_t addr, uint8_t count, uint8_t *values) { SPI_CE_LOW(); SPI1_SendByte(0x80 | addr); for(uint8_t i=0;i