![](/media/cache/group/default_image.jpg.50x50_q85.jpg)
First Commit
Dependencies: mbed Crypto_light mbed-rtos
Spin it 2 win it
Diff: main.cpp
- Revision:
- 4:e1141c1d8b19
- Parent:
- 3:2e32d7974962
- Child:
- 5:fe9b21ba2e33
diff -r 2e32d7974962 -r e1141c1d8b19 main.cpp --- a/main.cpp Mon Mar 12 11:58:08 2018 +0000 +++ b/main.cpp Mon Mar 12 14:41:46 2018 +0000 @@ -22,6 +22,10 @@ //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 256 //check the variable fifo position if this is changed + //Mapping from sequential drive states to motor phase outputs /* @@ -45,17 +49,104 @@ //Phase lead to make motor spin const int8_t lead = 2; //2 for forwards, -2 for backwards -//Instantiate the serial port -Serial pc(SERIAL_TX, SERIAL_RX); +//Instantiate the serial port, using RawSerial to deal with +//serial's undocumented buffering behaviour +RawSerial pc(SERIAL_TX, SERIAL_RX); + +//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; + + //------error for overflow-------------------------// + if(bufferPosition >= MAX_ARRAY_SIZE - 1){ + exit = true; + putMessage(MSG_OVERFLOW, bufferPositon); // + } + //-------------------------------------------------// + + + + //check for carriage return "\r" + if(newChar == 'r'){ + if(bufferpostion != 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 ++; + } + + }//end of : while(!exit){} + + + + //Place it on the end of a char[] array. Make the array large enough to contain the + //longest possible command. You will need to keep an index of the current buffer + //position. This would be easier with the C++ std::string class but there is not + //enough memory available for this. Using a C-style array is also faster and does not + //involve the uncertainty of dynamic memory allocation. + + //Include a test to make sure you do not write past the end of the buffer if the + //incoming string is too long. Buffer overflows have historically been the source of + //many software crashes and vulnerabilities since you may be able to alter the return + //address of a function if you write past the end of a buffer. + + + + + //If the incoming character is a carriage return ‘\r’ it indicates the end of a + //command. At this point: + //i. Place a string termination character ‘\0’ at the end of the command. This + //is used by functions like printf() and sscanf() to detect the end of the + //string. + //ii. Reset the buffer position index back to 0 ready to record the next command. + //iii. Test the first character to determine which command was sent. + //iv. Decode the rest of the command + + + + + +} +//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(); @@ -166,6 +257,8 @@ 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,