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mdb-cashless.ino
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mdb-cashless.ino
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#include "MDB.h"
#include <SPI.h>
#include <MFRC522.h>
#include <SoftwareSerial.h>
// SoftwareSerial for debugging
#define SOFTWARESERIAL_DEBUG_ENABLED 1
#ifdef SOFTWARESERIAL_DEBUG_ENABLED
#define RX_DEBUG_PIN 2
#define TX_DEBUG_PIN 3
#endif
// SPI Slaves Settings
#define RC522_SLS_PIN 10 // MFRC522 SlaveSelect Pin
#define RC522_RST_PIN 9 // SPI RESET Pin
typedef enum {GET, POST, HEAD} HTTP_Method; // 'keys' for HTTP functions
#ifdef SOFTWARESERIAL_DEBUG_ENABLED
SoftwareSerial Debug(RX_DEBUG_PIN, TX_DEBUG_PIN);
#endif
// SIMCOM module instance
//SoftwareSerial SIM900(SIMCOM_RX_PIN, SIMCOM_TX_PIN);
// Create MFRC522 instance
MFRC522 mfrc522(RC522_SLS_PIN, RC522_RST_PIN);
// String object for containing HEX represented UID
String uid_str_obj = "";
// Store the time of CSH_S_ENABLED start
uint32_t global_time = 0;
// Static Server port and address
String server_url_str = "http://xxx.xxx.xxx.xxx:xxx/api/Vending/";
//uint8_t in_progress = 0;
void setup() {
uint16_t test = 0;
// For debug LEDs
DDRC |= 0b00111111; // PORTC LEDs for 6 commands in MDB_CommandHandler() switch-case
//PORTC |= 0b00111111;
#ifdef SOFTWARESERIAL_DEBUG_ENABLED
Debug.begin(9600);
Debug.println(F("Debug mode enabled"));
#endif
// == Init card reader START ==
SPI.begin(); // Init SPI bus, MANDATORY
mfrc522.PCD_Init();
// == Init card reader END ==
//SIM900_Init();
MDB_Init();
sei();
}
void loop() {
uint16_t Command = 0;
uint16_t Csh_state = 0;
MDB_CommandHandler(&Command, &Csh_state);
// switch (Command)
// {
// case VMC_RESET : Debug.println("VMC_RESET"); break;
// case VMC_SETUP : Debug.println("VMC_SETUP"); break;
// case VMC_POLL : Debug.println("VMC_POLL"); break;
// case VMC_VEND : Debug.println("VMC_VEND"); break;
// case VMC_READER : Debug.println("VMC_READER"); break;
// case VMC_EXPANSION : Debug.println("VMC_EXPANSION"); break;
// default : break;
// }
//Debug.println(Command);
//Debug.println(Csh_state);
sessionHandler();
// without this delay READER_ENABLE command won't be in RX Buffer
// Establish the reason of this later (maybe something is wrong with RX buffer reading)
if (CSH_GetDeviceState() == CSH_S_DISABLED)
delay(15);
Debug.println("CSH_S_DISABLED");
}
/*
* Handler for two Cashless Device active states:
* ENABLED -- device is waiting for a new card
* VEND -- device is busy making transactions with the server
*/
void sessionHandler(void)
{
switch(CSH_GetDeviceState())
{
case CSH_S_ENABLED : RFID_readerHandler(); break;
// check timeout
case CSH_S_SESSION_IDLE : timeout(global_time, FUNDS_TIMEOUT * 1000); break;
case CSH_S_VEND : transactionHandler(); break;
default : break;
}
}
/*
* Waiting for RFID tag routine
* I a new card is detected and it is present in the server's database,
* server replies with available funds
* then set them via functions from MDB.h,
* and turn Cashless Device Poll Reply as BEGIN_SESSION
*/
void RFID_readerHandler(void)
{
Debug.println("ReaderHandler");
String old_uid_str_obj;
String new_uid_str_obj;
String http_request;
uint16_t status_code = 0;
uint16_t user_funds = 0;
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent())
return;
// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial())
return;
// in_progress = 0;
// Convert UID into string represented HEX number
// in reversed order (for human recognition)
getUIDStrHex(&mfrc522, &new_uid_str_obj);
// Check if there is no UID -- then just return
if (new_uid_str_obj.length() == 0)
return;
// Check if previous UID == UID that was just read
// to prevent an infinite HTTP GET requests
if (uid_str_obj == new_uid_str_obj)
return;
// Now update the global UID
uid_str_obj = new_uid_str_obj;
#ifdef SOFTWARESERIAL_DEBUG_ENABLED
Debug.println(uid_str_obj);
#endif
// HTTP handling
http_request = server_url_str + uid_str_obj;
submitHTTPRequest(GET, http_request, &status_code, &user_funds);
#ifdef SOFTWARESERIAL_DEBUG_ENABLED
Debug.print(F("HTTP Status Code: "));
Debug.println(status_code);
#endif
if (status_code == 200)
{
#ifdef SOFTWARESERIAL_DEBUG_ENABLED
Debug.print(F("Funds: "));
Debug.println(user_funds);
Debug.println(F("Poll State: Begin Session"));
#endif
CSH_SetUserFunds(user_funds); // Set current user funds
CSH_SetPollState(CSH_BEGIN_SESSION); // Set Poll Reply to BEGIN SESSION
CSH_SetDeviceState(CSH_S_PROCESSING);
global_time = millis();
return;
}
// If we got here that means we didn't receive permission for transaction
// so clear global UID string and global_time
uid_str_obj = "";
global_time = 0;
/*
* SET FUNDS AND CONNECTION TIMEOUT SOMEWHERE, TO CANCEL SESSION AFTER 10 SECONDS !!!
*/
}
/*
* Transaction routine
* At this point item_cost and item_number (or vend_amount)
* are should be set by VendRequest() (in MDB.c)
*/
void transactionHandler(void)
{
String http_request;
uint16_t status_code = 0;
uint16_t user_funds = 0;
uint16_t item_cost = CSH_GetItemCost();
uint16_t item_numb = CSH_GetVendAmount();
#ifdef SOFTWARESERIAL_DEBUG_ENABLED
Debug.println(F("Vend Request"));
#endif
http_request = server_url_str + uid_str_obj + "/" + String(item_cost);
uid_str_obj = "";
global_time = 0;
submitHTTPRequest(POST, http_request, &status_code, &user_funds);
if (status_code != 202)
{
CSH_SetPollState(CSH_VEND_DENIED);
CSH_SetDeviceState(CSH_S_PROCESSING);
#ifdef SOFTWARESERIAL_DEBUG_ENABLED
Debug.println(F("Vend Denied"));
#endif
return;
}
// If code is 202 -- tell VMC that vend is approved
CSH_SetPollState(CSH_VEND_APPROVED);
CSH_SetDeviceState(CSH_S_PROCESSING);
// in_progress = 1;
#ifdef SOFTWARESERIAL_DEBUG_ENABLED
Debug.println(F("Vend Approved"));
#endif
}
/*
* 20-02-2016
* Convert byte array with size of (4..10) 8-bit hex numbers into a string object
* Example: array of 4 hex numbers, which represents 32-bit unsigned long:
* {0x36, 0x6B, 0x1B, 0xDB} represents a 32-bit (4-word) number 0xDB1B6B36, which is converted into a string "63B6B1BD"
* This string represented hex number appears reversed for human recognition,
* although technically the least 4-bit hex digit accords to the first letter of a string, uuid_str[0]
* and the most significant 4-bit hex digit placed as a last char element (except for '\0')
*
* changes the String &uid_str object by pointer, considered as output
*/
void getUIDStrHex(MFRC522 *card, String *uid_str)
{
char uuid_str[2 * card->uid.size];
// This cycle makes a conversion of the following manner for each 8-bit number: {0x1B} --> {0x0B, 0x01}
for (byte i = 0; i < card->uid.size; ++i) {
uuid_str[2 * i] = card->uid.uidByte[i] & 0b1111;
uuid_str[2 * i + 1] = card->uid.uidByte[i] >> 4;
}
//uuid_str[2 * card->uid.size + 1] = '\0'; // Add a null-terminator to make it a C-style string
/*
* This cycle adds 0x30 or (0x41 - 0x0A) to actual numbers according to ASCII table
* 0x00 to 0x09 digits become '0' to '9' chars (add 0x30)
* 0x0A to 0x0F digits become 'A' to 'F' chars in UPPERCASE (add 0x41 and subtract 0x0A)
* Last thing is to copy that into a String object, which is easier to handle
*/
for (byte i = 0; i < 2 * card->uid.size; ++i)
{
if (uuid_str[i] < 0x0A)
uuid_str[i] = (uuid_str[i] + 0x30);
else
uuid_str[i] = (uuid_str[i] - 0x0A + 0x41);
*uid_str += uuid_str[i];
}
}
void setUID(String uid_str)
{
}
String getUID(void)
{
}
/*
* Send HTTP request
* input arguments: enum HTTPMethod -- GET, POST or HEAD
* String request -- request string of structure http://server_address:server_port/path
* uint8_t *http_status_code -- returned http code by pointer
* uint16_t *user_funds -- returned user funds by pointer
* returned value: none
*/
void submitHTTPRequest(HTTP_Method method, String http_link, uint16_t *status_code, uint16_t *user_funds)
{
*user_funds = 1000;
switch(method)
{
case GET : *status_code = 200;
case POST : *status_code = 202;
}
}
void timeout(uint32_t start_time, uint32_t timeout_value)
{
if (CSH_GetDeviceState() != CSH_S_SESSION_IDLE)
return;
// if (in_progress == 1)
// return;
if (millis() - start_time >= timeout_value)
terminateSession();
}
/*
* Terminates current session and sets device back to ENABLED state
* This one called when timeout ran out or return button was pressed
*/
void terminateSession(void)
{
CSH_SetPollState(CSH_SESSION_CANCEL_REQUEST);
CSH_SetDeviceState(CSH_S_ENABLED);
uid_str_obj = "";
global_time = 0;
#ifdef SOFTWARESERIAL_DEBUG_ENABLED
Debug.println(F("Session terminated"));
#endif
}
#include "MDB.h"
#include "USART.h"
#include <Arduino.h> // For LED debug purposes
#define RX_DEBUG_PIN 2
#define TX_DEBUG_PIN 3
VMC_Config_t vmc_config = {0, 0, 0, 0};
VMC_Prices_t vmc_prices = {0, 0};
// Available user funds, changed via server connection in the Enabled state
uint16_t user_funds = 0x0000;
// Selected item price, changed via VMC_VEND_REQUEST
uint16_t item_cost = 0x0000;
// Selected item amount, changed via VMC_VEND_REQUEST
// This one is not necessarily the ampunt of selected items to dispense,
// it also can be a single item position value in the VMC memory
uint16_t vend_amount = 0x0000;
uint8_t csh_error_code = 0;
// Cashless Device State and Poll State at a power-up
uint16_t csh_poll_state = CSH_JUST_RESET;
uint8_t csh_state = CSH_S_INACTIVE;
CSH_Config_t csh_config = {
0x02, // featureLevel
/*
* Russia's country code is 810 or 643,
* which translates into 0x18, 0x10
* or 0x16, 0x43
*/
// 0x18, // country code H
// 0x10, // country code L
0x19,
0x78,
/*
* The VMC I work with accepts only 2 decimal places,
* which is reasonable, considering 1 RUB = 100 Kopecks.
* But actually there are no kopecks
* in any item prices, rubles only.
* As a coin acceptor handles coins with minimum value of 1 RUB,
* I chose scaling factor 0d100 (0x64),
* which makes calculations easier to understand.
* Example: Funds available -- 1600.00 RUB
* Scale factor -- 100
* Decimal places -- 2
* This makes internal funds value 1600, or 0x0640 in HEX
* which divides into 0x06 and 0x40
* for two uint8_t internal variables
*/
0x01, // Scale Factor
0x02, // Decimal Places
FUNDS_TIMEOUT, // Max Response Time
0b00000001 // Misc Options
};
void MDB_Init(void)
{
USART_Init(9600);
}
/*
*
*/
void MDB_CommandHandler(uint16_t *Command, uint16_t *Csh_state)
{
uint16_t command = 0;
// MDB_Read(&command);
// wait for commands only for our cashless device
do {
MDB_Read(&command);
} while ((command < VMC_RESET) || (command > VMC_EXPANSION));
switch (command)
{
case VMC_RESET : /*PORTC ^= (1 << 0);*/ MDB_ResetHandler(); break;
case VMC_SETUP : /*PORTC ^= (1 << 1);*/ MDB_SetupHandler(); break;
case VMC_POLL : /*PORTC ^= (1 << 2);*/ MDB_PollHandler(); break;
case VMC_VEND : /*PORTC ^= (1 << 3);*/ MDB_VendHandler(); break;
case VMC_READER : /*PORTC ^= (1 << 4);*/ MDB_ReaderHandler(); break;
case VMC_EXPANSION : /*PORTC ^= (1 << 5);*/ MDB_ExpansionHandler(); break;
default : break;
}
switch (csh_state)
{
case CSH_S_INACTIVE : /*PORTC = 0; PORTC |= (1 << 0);*/ break;
case CSH_S_DISABLED : /*PORTC = 0; PORTC |= (1 << 1);*/ break;
case CSH_S_ENABLED : break;
case CSH_S_SESSION_IDLE : break;
case CSH_S_VEND : break;
default : break;
}
*Command = command;
*Csh_state= csh_state;
}
/*
* Handles Just Reset sequence
*/
void MDB_ResetHandler(void)
{
uint16_t readCmd; while (1) if (MDB_DataCount() > 0) break; MDB_Read(&readCmd);
Reset();
}
/*
* Handles Setup sequence
*/
void MDB_SetupHandler(void)
{
uint8_t i; // counter
uint8_t checksum = VMC_SETUP;
uint16_t vmc_temp;
uint8_t vmc_data[6];
/*
* wait for the whole frame
* frame structure:
* 1 subcommand + 4 vmc_config fields + 1 Checksum byte
* 6 elements total
*/
while (1)
if (MDB_DataCount() > 5)
break;
// Store frame in array
for (i = 0; i < 6; ++i)
{
MDB_Read(&vmc_temp);
vmc_data[i] = (uint8_t)(vmc_temp & 0x00FF); // get rid of Mode bit if present
}
// calculate checksum excluding last read element, which is a received checksum
// for (i = 0; i < 5; ++i)
checksum += calc_checksum(vmc_data, 5);
// compare calculated and received checksums
if (checksum != vmc_data[5])
{
MDB_Send(CSH_NAK);
return; // checksum mismatch, error
}
// vmc_data[0] is a SETUP Config Data or Max/Min Prices identifier
Debug.println(vmc_data[0]);
switch(vmc_data[0])
{
case VMC_CONFIG_DATA : {
// Store VMC data
vmc_config.featureLevel = vmc_data[1];
vmc_config.displayColumns = vmc_data[2];
vmc_config.displayRows = vmc_data[3];
vmc_config.displayInfo = vmc_data[4];
ConfigInfo();
}; break;
case VMC_MAX_MIN_PRICES : {
// Store VMC Prices
vmc_prices.maxPrice = ((uint16_t)vmc_data[1] << 8) | vmc_data[2];
vmc_prices.minPrice = ((uint16_t)vmc_data[3] << 8) | vmc_data[4];
// Send ACK
MDB_Send(CSH_ACK);
// Change state to DISABLED
csh_state = CSH_S_DISABLED;
}; break;
default : break;
}
}
/*
* Handles Poll replies
*/
void MDB_PollHandler(void)
{
switch(csh_poll_state)
{
case CSH_ACK : MDB_Send(CSH_ACK); break; // if no data is to send, answer with ACK
case CSH_SILENCE : break;
case CSH_JUST_RESET : JustReset(); break;
case CSH_READER_CONFIG_INFO : ConfigInfo(); break;
case CSH_DISPLAY_REQUEST : DisplayRequest(); break; // <<<=== Global Display Message
case CSH_BEGIN_SESSION : BeginSession(); break; // <<<=== Global User Funds
case CSH_SESSION_CANCEL_REQUEST : SessionCancelRequest(); break;
case CSH_VEND_APPROVED : VendApproved(); break;
case CSH_VEND_DENIED : VendDenied(); break;
case CSH_END_SESSION : EndSession(); break;
case CSH_CANCELLED : Cancelled(); break;
case CSH_PERIPHERAL_ID : PeripheralID(); break;
case CSH_MALFUNCTION_ERROR : MalfunctionError(); break;
case CSH_CMD_OUT_OF_SEQUENCE : CmdOutOfSequence(); break;
case CSH_DIAGNOSTIC_RESPONSE : DiagnosticResponse(); break;
default : break;
}
}
/*
*
*/
void MDB_VendHandler(void)
{
uint16_t subcomm_temp;
uint8_t subcomm;
// Wait for Subcommand (1 element total)
while (1)
if (MDB_DataCount() > 0)
break;
// Store Subcommand in array
MDB_Read(&subcomm_temp);
subcomm = (uint8_t)(subcomm_temp & 0x00FF); // get rid of Mode bit if present
// Switch through subcommands
switch(subcomm)
{
case VMC_VEND_REQUEST : VendRequest(); break;
case VMC_VEND_CANCEL : VendDenied(); break;
case VMC_VEND_SUCCESS : VendSuccessHandler(); break;
case VMC_VEND_FAILURE : VendFailureHandler(); break;
case VMC_VEND_SESSION_COMPLETE : VendSessionComplete(); break;
case VMC_VEND_CASH_SALE : VendCashSale(); break;
default : break;
}
}
/*
*
*/
void MDB_ReaderHandler(void)
{
uint8_t i; // counter
uint8_t checksum = VMC_READER;
uint16_t reader_temp;
uint8_t reader_data[2];
// Wait for Subcommand and checksum (2 elements total)
while (1)
if (MDB_DataCount() > 1)
break;
// Store received data in array
for (i = 0; i < 2; ++i)
{
MDB_Read(&reader_temp);
reader_data[i] = (uint8_t)(reader_temp & 0x00FF); // get rid of Mode bit if present
}
// Calculate checksum
checksum += calc_checksum(reader_data, 1);
// Second element is an incoming checksum, compare it to the calculated one
if (checksum != reader_data[1])
{
MDB_Send(CSH_NAK);
return; // checksum mismatch, error
}
// Look at Subcommand
switch(reader_data[0])
{
case VMC_READER_DISABLE : Disable(); break;
case VMC_READER_ENABLE : Enable(); break;
case VMC_READER_CANCEL : Cancelled(); break;
default : break;
}
}
/*
*
*/
void MDB_ExpansionHandler(void)
{
uint16_t readCmd = 0;
MDB_Read(&readCmd);
switch(readCmd)
{
case VMC_EXPANSION_REQUEST_ID : ExpansionRequestID();PORTC |= (1<<0); break;
case VMC_EXPANSION_DIAGNOSTICS : ExpansionDiagnostics(); break;
// Actually I never got VMC_EXPANSION_DIAGNOSTICS subcommand, so whatever
default : break;
}
// Not yet implemented
}
/*
* ========================================
* Start of MDB Bus Communication functions
* ========================================
*/
void MDB_Send(uint16_t data)
{
USART_TXBuf_Write(data);
}
/*
* Receive MDB Command/Reply/Data from the Bus
*/
void MDB_Read(uint16_t *data)
{
USART_RXBuf_Read(data);
}
/*
* Peek at the oldest incoming data from the Bus
*/
void MDB_Peek(uint16_t *data)
{
USART_RXBuf_Peek(data);
}
uint8_t MDB_DataCount (void)
{
return USART_RXBuf_Count();
}
/*
* ======================================
* End of MDB Bus Communication functions
* ======================================
*/
/*
* =============================================
* Start of Internal functions for main handlers
* =============================================
*/
void Reset(void)
{
// Reset all data
vmc_config.featureLevel = 0;
vmc_config.displayColumns = 0;
vmc_config.displayRows = 0;
vmc_config.displayInfo = 0;
vmc_prices.maxPrice = 0;
vmc_prices.minPrice = 0;
csh_error_code = 0;
// Send ACK, turn INACTIVE
csh_state = CSH_S_INACTIVE;
csh_poll_state = CSH_JUST_RESET;
//uint16_t readCmd; while (1) if (MDB_DataCount() > 0) break; MDB_Read(&readCmd);
MDB_Send(CSH_ACK);
while ( ! (USART_TXBuf_IsEmpty()) )
;
}
void JustReset(void)
{
uint16_t readCmd; while (1) if (MDB_DataCount() > 0) break; MDB_Read(&readCmd);
MDB_Send(CSH_JUST_RESET);
Reset();
while ( ! (USART_TXBuf_IsEmpty()) )
;
}
void ConfigInfo(void)
{
uint8_t checksum = 0;
// calculate checksum, no Mode bit yet
checksum = ( CSH_READER_CONFIG_INFO
+ csh_config.featureLevel
+ csh_config.countryCodeH
+ csh_config.countryCodeL
+ csh_config.scaleFactor
+ csh_config.decimalPlaces
+ csh_config.maxResponseTime
+ csh_config.miscOptions );
MDB_Send(CSH_READER_CONFIG_INFO);
MDB_Send(csh_config.featureLevel);
MDB_Send(csh_config.countryCodeH);
MDB_Send(csh_config.countryCodeL);
MDB_Send(csh_config.scaleFactor);
MDB_Send(csh_config.decimalPlaces);
MDB_Send(csh_config.maxResponseTime);
MDB_Send(csh_config.miscOptions);
MDB_Send(checksum | CSH_ACK);
while ( ! (USART_TXBuf_IsEmpty()) )
;
}
void DisplayRequest(void)
{
// char *message;
// uint8_t i;
// uint8_t checksum = CSH_DISPLAY_REQUEST;
// uint8_t message_length;
// // As in standard, the number of bytes must equal the product of Y3 and Y4
// // up to a maximum of 32 bytes in the setup/configuration command
// message_length = (vmc_config.displayColumns * vmc_config.displayRows);
// message = (char *)malloc(message_length * sizeof(char));
// /* Here you need to copy the message into allocated memory
// // Send al this on the Bus
// MDB_Send(CSH_DISPLAY_REQUEST);
// MDB_Send(0xAA); // Display time in arg * 0.1 second units
// MDB_Send(0x34);
// MDB_Send(0x38);
// checksum += (0xAA + 0x34 + 0x38);
// MDB_Send(checksum | CSH_ACK);
// for(i = 0; i < message_length; ++i)
// MDB_Send(*(message + i));
// free(message);
}
void BeginSession(void) // <<<=== Global User Funds
{
/*
* I need this variable because my VMC doesn't want to send a
* VMC_VEND command (0x113) after I answer it with a single BEGIN SESSION Poll Reply
* So I decided to try it several times, that is what this counter for
*/
static uint8_t begin_session_counter = 0;
// uint16_t reply;
uint8_t checksum = 0;
uint16_t funds = CSH_GetUserFunds();
uint8_t user_funds_H = (uint8_t)(funds >> 8);
uint8_t user_funds_L = (uint8_t)(funds & 0x00FF);
// Again, that ugly counter, experimentally established, that 10 times is enough
begin_session_counter++;
if (begin_session_counter >= 50)
{
csh_poll_state = CSH_ACK;
csh_state = CSH_S_SESSION_IDLE;
begin_session_counter = 0;
return;
}
// calculate checksum, no Mode bit yet
checksum = ( CSH_BEGIN_SESSION
+ user_funds_H
+ user_funds_L );
MDB_Send(CSH_BEGIN_SESSION);
MDB_Send(user_funds_H); // upper byte of funds available
MDB_Send(user_funds_L); // lower byte of funds available
MDB_Send(checksum | CSH_ACK); // set Mode bit and send
while ( ! (USART_TXBuf_IsEmpty()) )
;
// while (1)
// if (MDB_DataCount() > 0)
// break;
// do {
// MDB_Read(&reply);
// } while (reply != CSH_ACK);
// Initiate Session Idle State
}
void SessionCancelRequest(void)
{
MDB_Send(CSH_SESSION_CANCEL_REQUEST);
MDB_Send(CSH_SESSION_CANCEL_REQUEST | CSH_ACK); // Checksum with Mode bit
while ( ! (USART_TXBuf_IsEmpty()) )
;
}
void VendApproved(void)
{
static uint8_t vend_approved_counter = 0;
uint8_t checksum = 0;
uint8_t vend_amount_H = (uint8_t)(vend_amount >> 8);
uint8_t vend_amount_L = (uint8_t)(vend_amount & 0x00FF);
vend_approved_counter++;
if (vend_approved_counter >= 50)
{
csh_poll_state = CSH_END_SESSION;
vend_approved_counter = 0;
return;
}
// calculate checksum, no Mode bit yet
checksum = ( CSH_VEND_APPROVED
+ vend_amount_H
+ vend_amount_L );
MDB_Send(CSH_VEND_APPROVED);
MDB_Send(vend_amount_H); // Vend Amount H
MDB_Send(vend_amount_L); // Vend Amount L
MDB_Send(checksum | CSH_ACK); // set Mode bit and send
while ( ! (USART_TXBuf_IsEmpty()) )
;
}
void VendDenied(void)
{
MDB_Send(CSH_VEND_DENIED);
MDB_Send(CSH_VEND_DENIED | CSH_ACK); // Checksum with Mode bit set
while ( ! (USART_TXBuf_IsEmpty()) )
;
csh_poll_state = CSH_END_SESSION;
// // just for safety, this may be redundant
// item_cost = 0;
// vend_amount = 0;
}
void EndSession(void)
{
MDB_Send(CSH_END_SESSION);
MDB_Send(CSH_END_SESSION | CSH_ACK); // Checksum with Mode bit
// while ( ! (USART_TXBuf_IsEmpty()) )
// ;
// Null data of the ended session
CSH_SetUserFunds(0);
CSH_SetItemCost(0);
CSH_SetVendAmount(0);
CSH_SetPollState(CSH_JUST_RESET);
CSH_SetDeviceState(CSH_S_ENABLED); // csh_state = CSH_S_ENABLED;
}
void Cancelled(void)
{
if (csh_state != CSH_S_ENABLED)
return;
MDB_Send(CSH_CANCELLED);
MDB_Send(CSH_CANCELLED | CSH_ACK); // Checksum with Mode bit
while ( ! (USART_TXBuf_IsEmpty()) )
;
}
void PeripheralID(void)
{
// Not fully implemented yet
// Manufacturer Data, 30 bytes + checksum with mode bit
uint8_t i; // counter
uint8_t checksum = 0;
uint8_t periph_id[31];
uint8_t a_char = 0x41;
periph_id[0] = CSH_PERIPHERAL_ID;
periph_id[1] = 'U'; periph_id[2] = 'N'; periph_id[3] = 'I'; // Unicum manufacturer, Russia
// Set Manufacturer ID 000000000001
for (i = 4; i < 15; ++i)
periph_id[i] = 0;
periph_id[15] = 1;
// Set Serial Number, ASCII
// Set Model Number, ASCII
for (i = 16; i < 28; ++i)
periph_id[i] = a_char + i;
// Set Software verion, packed BCD
periph_id[28] = 1;
periph_id[29] = 0;
periph_id[30] = calc_checksum(periph_id, 29);
// Send all data on the bus
for (i = 0; i < 30; ++i)
MDB_Send(periph_id[i]);
MDB_Send(periph_id[30] | CSH_ACK);
while ( ! (USART_TXBuf_IsEmpty()) )
;
}
void MalfunctionError(void)
{
uint8_t i;
uint8_t malf_err[2];
malf_err[0] = CSH_MALFUNCTION_ERROR;
malf_err[1] = csh_error_code;
// calculate checksum, set Mode bit and store it
malf_err[2] = calc_checksum(malf_err, 2) | CSH_ACK;
for (i = 0; i < 3; ++i)
MDB_Send(malf_err[i]);
}
void CmdOutOfSequence(void)
{
MDB_Send(CSH_CMD_OUT_OF_SEQUENCE);
MDB_Send(CSH_CMD_OUT_OF_SEQUENCE | CSH_ACK);
}
void DiagnosticResponse(void)
{
}
/*
* Internal functions for MDB_VendHandler()
*/
void VendRequest(void)
{
uint8_t i; // counter
uint8_t checksum = VMC_VEND + VMC_VEND_REQUEST;
uint8_t vend_data[5];
uint16_t vend_temp;
// Wait for 5 elements in buffer
// 4 data + 1 checksum
while (1)
if (MDB_DataCount() > 4)
break;
// Read all data and store it in an array, with a subcommand
for (i = 0; i < 5; ++i)
{
MDB_Read(&vend_temp);
vend_data[i] = (uint8_t)(vend_temp & 0x00FF); // get rid of Mode bit if present
}
// calculate checksum excluding last read element, which is a received checksum
checksum += calc_checksum(vend_data, 4);
// compare calculated and received checksums
if (checksum != vend_data[4])
{
MDB_Send(CSH_NAK);
return; // checksum mismatch, error
}
CSH_SetItemCost((vend_data[0] << 8) | vend_data[1]);
CSH_SetVendAmount((vend_data[2] << 8) | vend_data[3]);
// Send ACK to VMC
MDB_Send(CSH_ACK);
// Set uninterruptable VEND state
csh_state = CSH_S_VEND;
/*
* ===================================
* HERE GOES THE CODE FOR RFID/HTTP Handlers
* if enough payment media, tell server to subtract sum
* wait for server reply, then CSH_VEND_APPROVED
* Otherwise, CSH_VEND_DENIED
* ===================================
*/
}
void VendSuccessHandler(void)
{
uint8_t i; // counter
uint8_t checksum = VMC_VEND + VMC_VEND_SUCCESS;
uint8_t vend_data[3];
uint16_t vend_temp;
// Wait for 3 elements in buffer
// 2 data + 1 checksum
while (1)
if (MDB_DataCount() > 2)
break;
for (i = 0; i < 3; ++i)
{
MDB_Read(&vend_temp);
vend_data[i] = (uint8_t)(vend_temp & 0x00FF); // get rid of Mode bit if present
}
/* here goes another check-check with a server */
MDB_Send(CSH_ACK);
// Return state to SESSION IDLE
csh_state = CSH_S_SESSION_IDLE;
// checksum += calc_checksum(vend_data, 2);
// if (checksum != vend_data[2])
// {
// MDB_Send(CSH_NAK);
// return; // checksum mismatch, error
// }
}
void VendFailureHandler(void)
{
uint8_t checksum = VMC_VEND + VMC_VEND_FAILURE;
uint8_t incoming_checksum;
uint16_t temp;
// Wait for 1 element in buffer
// 1 checksum
while (1)
if (MDB_DataCount() > 0)
break;
MDB_Read(&temp);
incoming_checksum = (uint8_t)(temp & 0x00FF); // get rid of Mode bit if present
if (checksum != incoming_checksum)
{
MDB_Send(CSH_NAK);
return; // checksum mismatch, error
}
/* refund through server connection */
MDB_Send(CSH_ACK); // in case of success
// MalfunctionError(); -- in case of failure, like unable to connect to server
// Return state to SESSION IDLE
csh_state = CSH_S_SESSION_IDLE;
}
void VendSessionComplete(void)
{
MDB_Send(CSH_ACK);
CSH_SetPollState(CSH_END_SESSION);
}
void VendCashSale(void)
{
uint8_t i; // counter
uint8_t checksum = VMC_VEND + VMC_VEND_CASH_SALE;
uint8_t vend_data[5];
uint16_t vend_temp;
// Wait for 5 elements in buffer
// 4 data + 1 checksum
while (1)
if (MDB_DataCount() > 4)
break;
for (i = 0; i < 5; ++i)
{
MDB_Read(&vend_temp);
vend_data[i] = (uint8_t)(vend_temp & 0x00FF); // get rid of Mode bit if present