RFID RC522 i STM32 BluePill

Czytnik RFID działa na STM32, problemem może być jedynie obsługa przerwań.

Hardware

Podłączymy do SPI2 (trzeba włączyć obsługę w CubeMX):
STM32 <=> RFID RC522
SPI2_MISO PB14 -> MISO
SPI2_MOSI PB15 -> MOSI
SPI2_SCK PB13 -> SCK
Teraz pin CS – można by do standardowego PB12, ale lepiej na osbony pin (można wtedy podłączyć więcej urządzeń SPI2 na jednej linii):
PA8 -> SDA – ten pin tylko włącza transfer do urządzenia ustawiając stan pinu

Dodatkowo potem do eksperymentów z przerwaniami można zdefiniować osobny pin np.
PA15 -> IRQ (ta linia jest niewykorzystana i nie musi być podłączana)

Uwaga na RST

Trzeba uważać na konfigurację linii RST dla RC522, domyślnie przy output (jest to output STM32 do RC522) ustawiona jest na 1 i się resetuje cały czas, objaw jest taki, że każde polecenie (np. pobranie wersji)

1 2	uint8_t RC522version = MFRC522_ReadRegister(MFRC522_REG_VERSION); printfx("RC522 Version (92 = version 2, 91 = version 1, ff = rst error): %#08x\r\n", RC522version );

zamiast zwrócić 0x91 (stara wersja RC522) lub 0x92 (nowa wersja) zwraca 0xFF, a czytnik nie działa. Jeśli taka jest sytuacja, w funkcji:

1	static void MX_GPIO_Init(void)

na końcu dopisujemy

1	HAL_GPIO_WritePin(GPIOB, RC522_RST_Pin, GPIO_PIN_SET); //domyślnie RESET będzie i dlatego nie działa.

(zmienna GPIOB i RC522_RST_Pin wskazują na pin podłączony do RST RC522, trzeba ustawić taki,jaki macie w CubeMX)

Soft

Trochę przerobiłem (uprościłem) przykład z innego poradnika i taki nieduży projekt wygląda tak, do terminala używam UART3 (printfx):

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/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2020 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
//obsługa RFID
#include "mfrc522.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
SPI_HandleTypeDef hspi2;

UART_HandleTypeDef huart3;

/* USER CODE BEGIN PV */
uint8_t i; //for
uint8_t differentRFID; //czy nowe RFID jest inne? (multiple readings protect)
uint8_t txBufInd;
uint8_t comand;
uint8_t txBuffer[18] = "ID: 00000000 "; //id w postaci char *
uint8_t retstr[10]; //powrót z funkcji konwersji hex_dec
uint8_t rxBuffer[8]; //ID w postacji stringu do odczytania (heksadecynalny)
uint8_t lastID[4]; //poprzednio wczytany ID w postaci binarnej
uint8_t str[MFRC522_MAX_LEN]; //aktualnie wczytany id w postaci binarnej (4 bajty, ale miejsca na 16)

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART3_UART_Init(void);
static void MX_SPI2_Init(void);
static void MX_NVIC_Init(void);
/* USER CODE BEGIN PFP */

#include <stdio.h>
#include <string.h>
volatile char t[100];
char buf_printf[100]; //max printf length
#define printfx(f_, ...) snprintf(buf_printf, 100, (f_), ##__VA_ARGS__); \
HAL_UART_Transmit(&huart3, (uint8_t*)buf_printf, strlen(buf_printf), 1000);

volatile uint8_t rc522interrupt = 0; // wystąpiło przerwanie RC522 trzeba obsłużyć w loop()

//FUNKCJE CZYTNIKA
uint8_t MFRC522_Check(uint8_t* id);
uint8_t MFRC522_Compare(uint8_t* CardID, uint8_t* CompareID);
void MFRC522_WriteRegister(uint8_t addr, uint8_t val);
uint8_t MFRC522_ReadRegister(uint8_t addr);
void MFRC522_SetBitMask(uint8_t reg, uint8_t mask);
void MFRC522_ClearBitMask(uint8_t reg, uint8_t mask);
uint8_t MFRC522_Request(uint8_t reqMode, uint8_t* TagType);
uint8_t MFRC522_ToCard(uint8_t command, uint8_t* sendData, uint8_t sendLen, uint8_t* backData, uint16_t* backLen);
uint8_t MFRC522_Anticoll(uint8_t* serNum);
void MFRC522_CalulateCRC(uint8_t* pIndata, uint8_t len, uint8_t* pOutData);
uint8_t MFRC522_SelectTag(uint8_t* serNum);
uint8_t MFRC522_Auth(uint8_t authMode, uint8_t BlockAddr, uint8_t* Sectorkey, uint8_t* serNum);
uint8_t MFRC522_Read(uint8_t blockAddr, uint8_t* recvData);
uint8_t MFRC522_Write(uint8_t blockAddr, uint8_t* writeData);
void MFRC522_Init(void);
void MFRC522_Reset(void);
void MFRC522_AntennaOn(void);
void MFRC522_AntennaOff(void);
void MFRC522_Halt(void);

//////////////

void char_to_hex(uint8_t data);
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */

/* USER CODE END 1 */

/* MCU Configuration--------------------------------------------------------*/

/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();

/* USER CODE BEGIN Init */

/* USER CODE END Init */

/* Configure the system clock */
SystemClock_Config();

/* USER CODE BEGIN SysInit */

/* USER CODE END SysInit */

/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART3_UART_Init();
MX_SPI2_Init();

/* Initialize interrupts */
MX_NVIC_Init();
/* USER CODE BEGIN 2 */
//FX:
MFRC522_Init();
printfx("FX:Init OK\r\n");
uint8_t RC522version = MFRC522_ReadRegister(MFRC522_REG_VERSION);
printfx("RC522 Version (92 = version 2, 91 = version 1): %#08x\n", RC522version );
/* USER CODE END 2 */

/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */

/* USER CODE BEGIN 3 */
if (!MFRC522_Request(PICC_REQIDL, str))//str - nasz klucz //PICC_REQIDL find the antenna area does not enter hibernation
{
if (!MFRC522_Anticoll(str))//str nasz klucz[16] ANTI COLLISION
{
//TU ODCZYTAł nowy klucz ID
differentRFID = 0; //bool czy kolejny wczytany klucz inny jest od poprzedniego? Tylko wtedy działaj (multiple readings)
txBufInd = 9; //indeks w stringu od którego piszemy ID: ...

for (i=0; i<4 && !differentRFID; i++)
if (lastID[i] != str[i])
differentRFID = 1; //sprawdzenie czy wczytany teraz klucz != poprzednio wczytanego

if (differentRFID)
{ //to się wywołuje jeśli kod RFID jest inny nniż do tej pory
for (i=0; i<4; i++)
lastID[i] = str[i]; //zapamiętaj ostatni nowy ID w str
for (i=0; i<4; i++)
{
char_to_hex(str[i]); //tu zapisuje w systemie 16 klucz do stringu z formatu bitowego na liczby 16 = 4 bajty
txBuffer[txBufInd] = retstr[0]; //retstr to return string z funkcji char_to_hex
txBufInd++;
txBuffer[txBufInd] = retstr[1]; //retstr to return string z funkcji char_to_hex
txBufInd++;
}
printfx("RFID: %s \n\r", (char *)txBuffer);
//HAL_UART_Transmit(&huart3, txBuffer, 18, 100);
}

}
}

HAL_Delay(10);
}

/* USER CODE END 3 */
}

/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|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_0) != HAL_OK)
{
Error_Handler();
}
}

/**
* @brief NVIC Configuration.
* @retval None
*/
static void MX_NVIC_Init(void)
{
/* EXTI15_10_IRQn interrupt configuration */
HAL_NVIC_SetPriority(EXTI15_10_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);
}

/**
* @brief SPI2 Initialization Function
* @param None
* @retval None
*/
static void MX_SPI2_Init(void)
{

/* USER CODE BEGIN SPI2_Init 0 */

/* USER CODE END SPI2_Init 0 */

/* USER CODE BEGIN SPI2_Init 1 */
//Tylko od standardowego zmieniona linia hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16; z dwóch
/* USER CODE END SPI2_Init 1 */
/* SPI2 parameter configuration*/
hspi2.Instance = SPI2;
hspi2.Init.Mode = SPI_MODE_MASTER;
hspi2.Init.Direction = SPI_DIRECTION_2LINES;
hspi2.Init.DataSize = SPI_DATASIZE_8BIT;
hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi2.Init.NSS = SPI_NSS_SOFT;
hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi2.Init.TIMode = SPI_TIMODE_DISABLE;
hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi2.Init.CRCPolynomial = 10;
if (HAL_SPI_Init(&hspi2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN SPI2_Init 2 */

/* USER CODE END SPI2_Init 2 */

}

/**
* @brief USART3 Initialization Function
* @param None
* @retval None
*/
static void MX_USART3_UART_Init(void)
{

/* USER CODE BEGIN USART3_Init 0 */

/* USER CODE END USART3_Init 0 */

/* USER CODE BEGIN USART3_Init 1 */

/* USER CODE END USART3_Init 1 */
huart3.Instance = USART3;
huart3.Init.BaudRate = 115200;
huart3.Init.WordLength = UART_WORDLENGTH_8B;
huart3.Init.StopBits = UART_STOPBITS_1;
huart3.Init.Parity = UART_PARITY_NONE;
huart3.Init.Mode = UART_MODE_TX_RX;
huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart3.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart3) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART3_Init 2 */

/* USER CODE END USART3_Init 2 */

}

/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};

/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();

/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GREENLED_GPIO_Port, GREENLED_Pin, GPIO_PIN_RESET);

/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(SPI2_CS_GPIO_Port, SPI2_CS_Pin, GPIO_PIN_RESET);

/*Configure GPIO pin : GREENLED_Pin */
GPIO_InitStruct.Pin = GREENLED_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GREENLED_GPIO_Port, &GPIO_InitStruct);

/*Configure GPIO pin : SPI2_CS_Pin */
GPIO_InitStruct.Pin = SPI2_CS_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(SPI2_CS_GPIO_Port, &GPIO_InitStruct);

/*Configure GPIO pin : RC522IRQ_Pin */
GPIO_InitStruct.Pin = RC522IRQ_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING_FALLING;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(RC522IRQ_GPIO_Port, &GPIO_InitStruct);

}

/* USER CODE BEGIN 4 */

// char number to string hex (FF) (Only big letters!)
void char_to_hex(uint8_t data) {
uint8_t digits[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};

if (data < 16) {
retstr[0] = '0';
retstr[1] = digits[data];
} else {
retstr[0] = digits[(data & 0xF0)>>4];
retstr[1] = digits[(data & 0x0F)];
}
}

void irqHandlerRC522(void)
{//niepodłączone
rc522interrupt = 1;
}

/* USER CODE END 4 */

/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
printfx("(main.c) Error_Handler");
/* USER CODE END Error_Handler_Debug */
}

#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(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

Biblioteka rc522.h (pożyczona z sieci), powinna być rozdzielona na plik h i c, ale na skróty w jednym wygląda tak:

#define cs_reset()    HAL_GPIO_WritePin(SPI2_CS_GPIO_Port, SPI2_CS_Pin, GPIO_PIN_RESET)
#define cs_set()    HAL_GPIO_WritePin(SPI2_CS_GPIO_Port, SPI2_CS_Pin, GPIO_PIN_SET)

// Status enumeration, Used with most functions
#define MI_OK 0
#define MI_NOTAGERR 1
#define MI_ERR 2

// MFRC522 Commands
#define PCD_IDLE 0x00 // NO action; Cancel the current command
#define PCD_AUTHENT 0x0E    // Authentication Key
#define PCD_RECEIVE 0x08 // Receive Data
#define PCD_TRANSMIT 0x04 // Transmit data
#define PCD_TRANSCEIVE 0x0C // Transmit and receive data,
#define PCD_RESETPHASE 0x0F // Reset
#define PCD_CALCCRC 0x03 // CRC Calculate

// Mifare_One card command word
#define PICC_REQIDL 0x26 // find the antenna area does not enter hibernation
#define PICC_REQALL 0x52 // find all the cards antenna area
#define PICC_ANTICOLL 0x93 // anti-collision
#define PICC_SElECTTAG 0x93 // election card
#define PICC_AUTHENT1A 0x60 // authentication key A
#define PICC_AUTHENT1B 0x61 // authentication key B
#define PICC_READ 0x30 // Read Block
#define PICC_WRITE 0xA0 // write block
#define PICC_DECREMENT 0xC0 // debit
#define PICC_INCREMENT 0xC1 // recharge
#define PICC_RESTORE 0xC2 // transfer block data to the buffer
#define PICC_TRANSFER 0xB0 // save the data in the buffer
#define PICC_HALT 0x50 // Sleep

// MFRC522 Registers
// Page 0: Command and Status
#define MFRC522_REG_RESERVED00 0x00
#define MFRC522_REG_COMMAND 0x01
#define MFRC522_REG_COMM_IE_N 0x02
#define MFRC522_REG_DIV1_EN 0x03
#define MFRC522_REG_COMM_IRQ 0x04
#define MFRC522_REG_DIV_IRQ 0x05
#define MFRC522_REG_ERROR 0x06
#define MFRC522_REG_STATUS1 0x07
#define MFRC522_REG_STATUS2 0x08
#define MFRC522_REG_FIFO_DATA 0x09 //str 44
#define MFRC522_REG_FIFO_LEVEL 0x0A //7 bit - zeruje FIFO, reszta odczyt poziomu fifo
#define MFRC522_REG_WATER_LEVEL 0x0B
#define MFRC522_REG_CONTROL 0x0C
#define MFRC522_REG_BIT_FRAMING 0x0D
#define MFRC522_REG_COLL 0x0E
#define MFRC522_REG_RESERVED01 0x0F
// Page 1: Command
#define MFRC522_REG_RESERVED10 0x10
#define MFRC522_REG_MODE 0x11
#define MFRC522_REG_TX_MODE 0x12
#define MFRC522_REG_RX_MODE 0x13
#define MFRC522_REG_TX_CONTROL 0x14
#define MFRC522_REG_TX_AUTO 0x15
#define MFRC522_REG_TX_SELL 0x16
#define MFRC522_REG_RX_SELL 0x17
#define MFRC522_REG_RX_THRESHOLD 0x18
#define MFRC522_REG_DEMOD 0x19
#define MFRC522_REG_RESERVED11 0x1A
#define MFRC522_REG_RESERVED12 0x1B
#define MFRC522_REG_MIFARE 0x1C
#define MFRC522_REG_RESERVED13 0x1D
#define MFRC522_REG_RESERVED14 0x1E
#define MFRC522_REG_SERIALSPEED 0x1F
// Page 2: CFG
#define MFRC522_REG_RESERVED20 0x20
#define MFRC522_REG_CRC_RESULT_M 0x21
#define MFRC522_REG_CRC_RESULT_L 0x22
#define MFRC522_REG_RESERVED21 0x23
#define MFRC522_REG_MOD_WIDTH 0x24
#define MFRC522_REG_RESERVED22 0x25
#define MFRC522_REG_RF_CFG 0x26
#define MFRC522_REG_GS_N 0x27
#define MFRC522_REG_CWGS_PREG 0x28
#define MFRC522_REG__MODGS_PREG 0x29
#define MFRC522_REG_T_MODE 0x2A
#define MFRC522_REG_T_PRESCALER 0x2B
#define MFRC522_REG_T_RELOAD_H 0x2C
#define MFRC522_REG_T_RELOAD_L 0x2D
#define MFRC522_REG_T_COUNTER_VALUE_H 0x2E
#define MFRC522_REG_T_COUNTER_VALUE_L 0x2F
// Page 3:TestRegister
#define MFRC522_REG_RESERVED30 0x30
#define MFRC522_REG_TEST_SEL1 0x31
#define MFRC522_REG_TEST_SEL2 0x32
#define MFRC522_REG_TEST_PIN_EN 0x33
#define MFRC522_REG_TEST_PIN_VALUE 0x34
#define MFRC522_REG_TEST_BUS 0x35
#define MFRC522_REG_AUTO_TEST 0x36
#define MFRC522_REG_VERSION 0x37
#define MFRC522_REG_ANALOG_TEST 0x38
#define MFRC522_REG_TEST_ADC1 0x39
#define MFRC522_REG_TEST_ADC2 0x3A
#define MFRC522_REG_TEST_ADC0 0x3B
#define MFRC522_REG_RESERVED31 0x3C
#define MFRC522_REG_RESERVED32 0x3D
#define MFRC522_REG_RESERVED33 0x3E
#define MFRC522_REG_RESERVED34 0x3F

#define MFRC522_DUMMY 0x00 // Dummy byte
#define MFRC522_MAX_LEN 16 // Buf len byte

#include "stm32f1xx_hal.h"
//hal zamiast it
//#include "mfrc522.h"

extern SPI_HandleTypeDef hspi2;

// RC522
extern uint8_t MFRC522_Check(uint8_t* id);
extern uint8_t MFRC522_Compare(uint8_t* CardID, uint8_t* CompareID);
extern void MFRC522_WriteRegister(uint8_t addr, uint8_t val);
extern uint8_t MFRC522_ReadRegister(uint8_t addr);
extern void MFRC522_SetBitMask(uint8_t reg, uint8_t mask);
extern void MFRC522_ClearBitMask(uint8_t reg, uint8_t mask);
extern uint8_t MFRC522_Request(uint8_t reqMode, uint8_t* TagType);
extern uint8_t MFRC522_ToCard(uint8_t command, uint8_t* sendData, uint8_t sendLen, uint8_t* backData, uint16_t* backLen);
extern uint8_t MFRC522_Anticoll(uint8_t* serNum);
extern void MFRC522_CalulateCRC(uint8_t* pIndata, uint8_t len, uint8_t* pOutData);
extern uint8_t MFRC522_SelectTag(uint8_t* serNum);
extern uint8_t MFRC522_Auth(uint8_t authMode, uint8_t BlockAddr, uint8_t* Sectorkey, uint8_t* serNum);
extern uint8_t MFRC522_Read(uint8_t blockAddr, uint8_t* recvData);
extern uint8_t MFRC522_Write(uint8_t blockAddr, uint8_t* writeData);
extern void MFRC522_Init(void);
extern void MFRC522_Reset(void);
extern void MFRC522_AntennaOn(void);
extern void MFRC522_AntennaOff(void);
extern void MFRC522_Halt(void);

////////////////////////////////////////////////////////////////////////////////////////////
///// mfrc522.c
///////////////////////////////////////////////////////////////////////////////////////////

uint8_t SPI1SendByte(uint8_t data) {
unsigned char writeCommand[1];
unsigned char readValue[1];

writeCommand[0] = data;
HAL_SPI_TransmitReceive(&hspi2, (uint8_t*)&writeCommand, (uint8_t*)&readValue, 1, 10);
return readValue[0];
}

void SPI1_WriteReg(uint8_t address, uint8_t value) {
cs_reset();
SPI1SendByte(address);
SPI1SendByte(value);
cs_set();
}

uint8_t SPI1_ReadReg(uint8_t address) {
uint8_t val;

cs_reset();
SPI1SendByte(address);
val = SPI1SendByte(0x00);
cs_set();
return val;
}

void MFRC522_WriteRegister(uint8_t addr, uint8_t val) {
addr = (addr << 1) & 0x7E; // Address format: 0XXXXXX0
SPI1_WriteReg(addr, val);
}

uint8_t MFRC522_ReadRegister(uint8_t addr) {
uint8_t val;

addr = ((addr << 1) & 0x7E) | 0x80;
val = SPI1_ReadReg(addr);
return val;
}

uint8_t MFRC522_Check(uint8_t* id) {
uint8_t status;
status = MFRC522_Request(PICC_REQIDL, id); // Find cards, return card type
if (status == MI_OK) status = MFRC522_Anticoll(id); // Card detected. Anti-collision, return card serial number 4 bytes
MFRC522_Halt(); // Command card into hibernation
return status;
}

uint8_t MFRC522_Compare(uint8_t* CardID, uint8_t* CompareID) {
uint8_t i;
for (i = 0; i < 5; i++) {
if (CardID[i] != CompareID[i]) return MI_ERR;
}
return MI_OK;
}

void MFRC522_SetBitMask(uint8_t reg, uint8_t mask) {
MFRC522_WriteRegister(reg, MFRC522_ReadRegister(reg) | mask);
}

void MFRC522_ClearBitMask(uint8_t reg, uint8_t mask){
MFRC522_WriteRegister(reg, MFRC522_ReadRegister(reg) & (~mask));
}

uint8_t MFRC522_Request(uint8_t reqMode, uint8_t* TagType) {
uint8_t status;
uint16_t backBits; // The received data bits

MFRC522_WriteRegister(MFRC522_REG_BIT_FRAMING, 0x07); // TxLastBists = BitFramingReg[2..0]
TagType[0] = reqMode;
status = MFRC522_ToCard(PCD_TRANSCEIVE, TagType, 1, TagType, &backBits); //PCD_TRANSCEIVE - wyślij i odbierz
if ((status != MI_OK) || (backBits != 0x10)) status = MI_ERR;
return status;
}

uint8_t MFRC522_ToCard(uint8_t command, uint8_t* sendData, uint8_t sendLen, uint8_t* backData, uint16_t* backLen) {
uint8_t status = MI_ERR;
uint8_t irqEn = 0x00;
uint8_t waitIRq = 0x00;
uint8_t lastBits;
uint8_t n;
uint16_t i;

switch (command) {
case PCD_AUTHENT: {
irqEn = 0x12;
waitIRq = 0x10;
break;
}
case PCD_TRANSCEIVE: {
irqEn = 0x77;
waitIRq = 0x30;
break;
}
default:
break;
}

MFRC522_WriteRegister(MFRC522_REG_COMM_IE_N, irqEn | 0x80);
MFRC522_ClearBitMask(MFRC522_REG_COMM_IRQ, 0x80);
MFRC522_SetBitMask(MFRC522_REG_FIFO_LEVEL, 0x80);
MFRC522_WriteRegister(MFRC522_REG_COMMAND, PCD_IDLE);

// Writing data to the FIFO
for (i = 0; i < sendLen; i++) MFRC522_WriteRegister(MFRC522_REG_FIFO_DATA, sendData[i]);

// Execute the command
MFRC522_WriteRegister(MFRC522_REG_COMMAND, command);
if (command == PCD_TRANSCEIVE) MFRC522_SetBitMask(MFRC522_REG_BIT_FRAMING, 0x80);

i = 2000; //
do {

n = MFRC522_ReadRegister(MFRC522_REG_COMM_IRQ);
i--;
} while ((i!=0) && !(n&0x01) && !(n&waitIRq));

MFRC522_ClearBitMask(MFRC522_REG_BIT_FRAMING, 0x80); // StartSend=0

if (i != 0) {
if (!(MFRC522_ReadRegister(MFRC522_REG_ERROR) & 0x1B)) {
status = MI_OK;
if (n & irqEn & 0x01) status = MI_NOTAGERR;
if (command == PCD_TRANSCEIVE) {
n = MFRC522_ReadRegister(MFRC522_REG_FIFO_LEVEL);
lastBits = MFRC522_ReadRegister(MFRC522_REG_CONTROL) & 0x07;
if (lastBits) *backLen = (n-1)*8+lastBits; else *backLen = n*8;
if (n == 0) n = 1;
if (n > MFRC522_MAX_LEN) n = MFRC522_MAX_LEN;
for (i = 0; i < n; i++) backData[i] = MFRC522_ReadRegister(MFRC522_REG_FIFO_DATA); // Reading the received data in FIFO
}
} else status = MI_ERR;
}
return status;
}

uint8_t MFRC522_Anticoll(uint8_t* serNum) {
uint8_t status;
uint8_t i;
uint8_t serNumCheck = 0;
uint16_t unLen;

MFRC522_WriteRegister(MFRC522_REG_BIT_FRAMING, 0x00); // TxLastBists = BitFramingReg[2..0]
serNum[0] = PICC_ANTICOLL;
serNum[1] = 0x20;
status = MFRC522_ToCard(PCD_TRANSCEIVE, serNum, 2, serNum, &unLen);
if (status == MI_OK) {
// Check card serial number
for (i = 0; i < 4; i++) serNumCheck ^= serNum[i];
if (serNumCheck != serNum[i]) status = MI_ERR;
}
return status;
}

void MFRC522_CalculateCRC(uint8_t* pIndata, uint8_t len, uint8_t* pOutData) {
uint8_t i, n;

MFRC522_ClearBitMask(MFRC522_REG_DIV_IRQ, 0x04); // CRCIrq = 0
MFRC522_SetBitMask(MFRC522_REG_FIFO_LEVEL, 0x80); // Clear the FIFO pointer
// Write_MFRC522(CommandReg, PCD_IDLE);

// Writing data to the FIFO
for (i = 0; i < len; i++) MFRC522_WriteRegister(MFRC522_REG_FIFO_DATA, *(pIndata+i));
MFRC522_WriteRegister(MFRC522_REG_COMMAND, PCD_CALCCRC);

// Wait CRC calculation is complete
i = 0xFF;
do {
n = MFRC522_ReadRegister(MFRC522_REG_DIV_IRQ);
i--;
} while ((i!=0) && !(n&0x04)); // CRCIrq = 1

// Read CRC calculation result
pOutData[0] = MFRC522_ReadRegister(MFRC522_REG_CRC_RESULT_L);
pOutData[1] = MFRC522_ReadRegister(MFRC522_REG_CRC_RESULT_M);
}

uint8_t MFRC522_SelectTag(uint8_t* serNum) {
uint8_t i;
uint8_t status;
uint8_t size;
uint16_t recvBits;
uint8_t buffer[9];

buffer[0] = PICC_SElECTTAG;
buffer[1] = 0x70;
for (i = 0; i < 5; i++) buffer[i+2] = *(serNum+i);
MFRC522_CalculateCRC(buffer, 7, &buffer[7]); //??
status = MFRC522_ToCard(PCD_TRANSCEIVE, buffer, 9, buffer, &recvBits);
if ((status == MI_OK) && (recvBits == 0x18)) size = buffer[0]; else size = 0;
return size;
}

uint8_t MFRC522_Auth(uint8_t authMode, uint8_t BlockAddr, uint8_t* Sectorkey, uint8_t* serNum) {
uint8_t status;
uint16_t recvBits;
uint8_t i;
uint8_t buff[12];

// Verify the command block address + sector + password + card serial number
buff[0] = authMode;
buff[1] = BlockAddr;
for (i = 0; i < 6; i++) buff[i+2] = *(Sectorkey+i);
for (i=0; i<4; i++) buff[i+8] = *(serNum+i);
status = MFRC522_ToCard(PCD_AUTHENT, buff, 12, buff, &recvBits);
if ((status != MI_OK) || (!(MFRC522_ReadRegister(MFRC522_REG_STATUS2) & 0x08))) status = MI_ERR;
return status;
}

uint8_t MFRC522_Read(uint8_t blockAddr, uint8_t* recvData) {
uint8_t status;
uint16_t unLen;

recvData[0] = PICC_READ;
recvData[1] = blockAddr;
MFRC522_CalculateCRC(recvData,2, &recvData[2]);
status = MFRC522_ToCard(PCD_TRANSCEIVE, recvData, 4, recvData, &unLen);
if ((status != MI_OK) || (unLen != 0x90)) status = MI_ERR;
return status;
}

uint8_t MFRC522_Write(uint8_t blockAddr, uint8_t* writeData) {
uint8_t status;
uint16_t recvBits;
uint8_t i;
uint8_t buff[18];

buff[0] = PICC_WRITE;
buff[1] = blockAddr;
MFRC522_CalculateCRC(buff, 2, &buff[2]);
status = MFRC522_ToCard(PCD_TRANSCEIVE, buff, 4, buff, &recvBits);
if ((status != MI_OK) || (recvBits != 4) || ((buff[0] & 0x0F) != 0x0A)) status = MI_ERR;
if (status == MI_OK) {
// Data to the FIFO write 16Byte
for (i = 0; i < 16; i++) buff[i] = *(writeData+i);
MFRC522_CalculateCRC(buff, 16, &buff[16]);
status = MFRC522_ToCard(PCD_TRANSCEIVE, buff, 18, buff, &recvBits);
if ((status != MI_OK) || (recvBits != 4) || ((buff[0] & 0x0F) != 0x0A)) status = MI_ERR;
}
return status;
}

void MFRC522_Init(void) {
MFRC522_Reset();
MFRC522_WriteRegister(MFRC522_REG_T_MODE, 0x8D);
MFRC522_WriteRegister(MFRC522_REG_T_PRESCALER, 0x3E);
MFRC522_WriteRegister(MFRC522_REG_T_RELOAD_L, 30);
MFRC522_WriteRegister(MFRC522_REG_T_RELOAD_H, 0);
MFRC522_WriteRegister(MFRC522_REG_RF_CFG, 0x70); // 48dB gain
MFRC522_WriteRegister(MFRC522_REG_TX_AUTO, 0x40);
MFRC522_WriteRegister(MFRC522_REG_MODE, 0x3D);
MFRC522_AntennaOn(); // Open the antenna
}

void MFRC522_Reset(void) {
MFRC522_WriteRegister(MFRC522_REG_COMMAND, PCD_RESETPHASE);
}

void MFRC522_AntennaOn(void) {
uint8_t temp;

temp = MFRC522_ReadRegister(MFRC522_REG_TX_CONTROL);
if (!(temp & 0x03)) MFRC522_SetBitMask(MFRC522_REG_TX_CONTROL, 0x03);
}

void MFRC522_AntennaOff(void) {
MFRC522_ClearBitMask(MFRC522_REG_TX_CONTROL, 0x03);
}

void MFRC522_Halt(void) {
uint16_t unLen;
uint8_t buff[4];

buff[0] = PICC_HALT;
buff[1] = 0;
MFRC522_CalculateCRC(buff, 2, &buff[2]);
MFRC522_ToCard(PCD_TRANSCEIVE, buff, 4, buff, &unLen);
}

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