![](/media/cache/group/default_image.jpg.50x50_q85.jpg)
First Commit
Dependencies: mbed Crypto_light mbed-rtos
Spin it 2 win it
main.cpp
- Committer:
- TrebleStick
- Date:
- 2018-03-12
- Revision:
- 6:44c53574bf84
- Parent:
- 5:fe9b21ba2e33
- Child:
- 7:0d6632fba8d4
File content as of revision 6:44c53574bf84:
#include "mbed.h" #include "Crypto_light/hash/SHA256.h" #include "mbed-rtos/rtos/rtos.h" //Photointerrupter input pins #define I1pin D2 #define I2pin D11 #define I3pin D12 //Incremental encoder input pins #define CHA D7 #define CHB D8 //Motor Drive output pins //Mask in output byte #define L1Lpin D4 //0x01 #define L1Hpin D5 //0x02 #define L2Lpin D3 //0x04 #define L2Hpin D6 //0x08 #define L3Lpin D9 //0x10 #define L3Hpin D10 //0x20 //Enum for putMessage message types #define MSG_HASHCOUNT 0 #define MSG_NONCE_OK 1 #define MSG_OVERFLOW 2 //FIFO constant definitions #define MAX_ARRAY_SIZE 19 //Max length of input codes //Mapping from sequential drive states to motor phase outputs /* State L1 L2 L3 0 H - L 1 - H L 2 L H - 3 L - H 4 - L H 5 H L - 6 - - - 7 - - - */ //Drive state to output table const int8_t driveTable[] = {0x12,0x18,0x09,0x21,0x24,0x06,0x00,0x00}; //Mapping from interrupter inputs to sequential rotor states. 0x00 and 0x07 are not valid const int8_t stateMap[] = {0x07,0x05,0x03,0x04,0x01,0x00,0x02,0x07}; //const int8_t stateMap[] = {0x07,0x01,0x03,0x02,0x05,0x00,0x04,0x07}; //Alternative if phase order of input or drive is reversed //Phase lead to make motor spin const int8_t lead = 2; //2 for forwards, -2 for backwards //Instantiate the serial port, using RawSerial to deal with //serial's undocumented buffering behaviour RawSerial pc(SERIAL_TX, SERIAL_RX); //structure for Mail Class typedef struct { uint8_t code; uint32_t data; } message_t ; //Mail class allowing 16 messages to be stored up in the FIFO Mail<message_t,16> outMessages; //Replacement for printf so that notification shortcodes can be sent void putMessage(uint8_t code, uint32_t data) { message_t *pMessage = outMessages.alloc(); pMessage->code = code; pMessage->data = data; outMessages.put(pMessage); } Thread commOutT; void commOutFn() { while(1) { osEvent newEvent = outMessages.get(); message_t *pMessage = (message_t*)newEvent.value.p; pc.printf("Message %d with data 0x%016x\r\n", pMessage->code,pMessage->data); outMessages.free(pMessage); } } //Queue class Queue<void, 8> inCharQ; //serial port ISR to take individual chars void serialISR(){ uint8_t newChar = pc.getc(); inCharQ.put((void*)newChar); } //decode commands Thread decodeT; void decodeFn(){ pc.attach(&serialISR); char charArray[MAX_ARRAY_SIZE] = ""; uint32_t bufferPosition = 0; //change this variable type if the max buffer/fifio size is found to be different bool exit = false; while(!exit) { //get new char osEvent newEvent = inCharQ.get(); uint8_t newChar = (uint8_t)newEvent.value.p; //check for carriage return "\r" if(newChar == 'r'){ if(bufferPosition != 0){ if(charArray[bufferPosition - 1] == '\\'){ //carriage found newChar = '0'; //replace character //add to array charArray[bufferPosition] = newChar; //reset buffer bufferPosition = 0; //send char array to decoder *** } } } //Add new char to array else{ //add character at current position charArray[bufferPosition] = newChar; bufferPosition ++; } //------error for overflow-------------------------// if(bufferPosition >= MAX_ARRAY_SIZE ){ exit = true; putMessage(MSG_OVERFLOW, bufferPosition); // } //-------------------------------------------------// }//end of : while(!exit){} //iii. Test the first character to determine which command was sent. //iv. Decode the rest of the command } //Status LED DigitalOut led1(LED1); //Photointerrupter inputs InterruptIn I1(I1pin); InterruptIn I2(I2pin); InterruptIn I3(I3pin); //Motor Drive outputs DigitalOut L1L(L1Lpin); DigitalOut L1H(L1Hpin); DigitalOut L2L(L2Lpin); DigitalOut L2H(L2Hpin); DigitalOut L3L(L3Lpin); DigitalOut L3H(L3Hpin); volatile uint16_t hashcount = 0; void do_hashcount() { putMessage(MSG_HASHCOUNT, hashcount); hashcount = 0; } //Set a given drive state void motorOut(int8_t driveState) { //Lookup the output byte from the drive state. int8_t driveOut = driveTable[driveState & 0x07]; //Turn off first if (~driveOut & 0x01) L1L = 0; if (~driveOut & 0x02) L1H = 1; if (~driveOut & 0x04) L2L = 0; if (~driveOut & 0x08) L2H = 1; if (~driveOut & 0x10) L3L = 0; if (~driveOut & 0x20) L3H = 1; //Then turn on if (driveOut & 0x01) L1L = 1; if (driveOut & 0x02) L1H = 0; if (driveOut & 0x04) L2L = 1; if (driveOut & 0x08) L2H = 0; if (driveOut & 0x10) L3L = 1; if (driveOut & 0x20) L3H = 0; } //Convert photointerrupter inputs to a rotor state inline int8_t readRotorState() { return stateMap[I1 + 2*I2 + 4*I3]; } //Basic synchronisation routine int8_t motorHome() { //Put the motor in drive state 0 and wait for it to stabilise motorOut(0); wait(2.0); //Get the rotor state return readRotorState(); } void photointerrupter_isr() { int8_t orState = motorHome(); int8_t intState = readRotorState(); motorOut((intState-orState+lead+6)%6); //+6 to make sure the remainder is positive } //Main int main() { I1.rise(&photointerrupter_isr); I2.rise(&photointerrupter_isr); I3.rise(&photointerrupter_isr); I1.fall(&photointerrupter_isr); I2.fall(&photointerrupter_isr); I3.fall(&photointerrupter_isr); Ticker hashcounter; hashcounter.attach(&do_hashcount, 1.0); commOutT.start(&commOutFn); decodeT.start(&decodeFn); uint8_t sequence[] = {0x45,0x6D,0x62,0x65,0x64,0x64,0x65,0x64, 0x20,0x53,0x79,0x73,0x74,0x65,0x6D,0x73, 0x20,0x61,0x72,0x65,0x20,0x66,0x75,0x6E, 0x20,0x61,0x6E,0x64,0x20,0x64,0x6F,0x20, 0x61,0x77,0x65,0x73,0x6F,0x6D,0x65,0x20, 0x74,0x68,0x69,0x6E,0x67,0x73,0x21,0x20, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}; uint64_t* key = (uint64_t*)((int)sequence + 48); uint64_t* nonce = (uint64_t*)((int)sequence + 56); uint8_t hash[32]; //Poll the rotor state and set the motor outputs accordingly to spin the motor while (1) { SHA256::computeHash(hash, sequence, 64); if (hash[0] == 0 && hash[1] == 0) { putMessage(MSG_NONCE_OK, *nonce); } (*nonce)++; hashcount++; } }