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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2105 | - | 1 | #include "main.h" |
| 2 | #include "uart.h" |
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| 3 | |||
| 4 | int uart0_filestream = -1; |
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| 5 | int usb_stream = -1; |
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| 6 | int data_length; //length of transmitting data string |
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| 7 | |||
| 8 | |||
| 9 | //>> Adding checksum and transmitting data |
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| 10 | //------------------------------------------------------------------------------------------------------ |
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| 11 | void transmit_data(serial_data_struct* pdata_package){ |
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| 12 | if (uart0_filestream != -1) |
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| 13 | { |
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| 14 | int count = write(uart0_filestream, pdata_package->txrxdata, pdata_package->cmdLength); |
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| 15 | if (count < 0) |
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| 16 | { |
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| 17 | printf("UART TX error\n"); |
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| 18 | } |
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| 19 | } |
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| 20 | } |
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| 21 | |||
| 22 | //>> Adding address and command ID, encoding and checksum |
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| 23 | //------------------------------------------------------------------------------------------------------ |
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| 24 | void create_serial_frame(u8 address, u8 cmdID, u16 cmdLength, serial_data_struct* pdata_package){ |
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| 25 | pdata_package->txrxdata[0] = '#'; |
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| 26 | pdata_package->txrxdata[1] = address + 'a'; |
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| 27 | pdata_package->txrxdata[2] = cmdID; |
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| 28 | |||
| 29 | //encode data |
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| 30 | u8 a,b,c; |
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| 31 | int counter = 0; |
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| 32 | int u = 3; |
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| 33 | while(cmdLength){ |
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| 34 | if(cmdLength) |
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| 35 | { |
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| 36 | cmdLength--; |
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| 37 | a = pdata_package->data[counter++]; |
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| 38 | }else{a = 0; counter++;}; |
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| 39 | if(cmdLength) |
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| 40 | { |
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| 41 | cmdLength--; |
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| 42 | b = pdata_package->data[counter++]; |
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| 43 | }else{b = 0; counter++;}; |
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| 44 | if(cmdLength) |
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| 45 | { |
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| 46 | cmdLength--; |
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| 47 | c = pdata_package->data[counter++]; |
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| 48 | }else{c = 0; counter++;}; |
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| 49 | pdata_package->txrxdata[u++] = '=' + (a >> 2); |
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| 50 | pdata_package->txrxdata[u++] = '=' + (((a & 0x03) << 4) | ((b & 0xf0) >> 4)); |
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| 51 | pdata_package->txrxdata[u++] = '=' + (((b & 0x0f) << 2) | ((c & 0xc0) >> 6)); |
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| 52 | pdata_package->txrxdata[u++] = '=' + (c & 0x3f); |
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| 53 | } |
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| 54 | |||
| 55 | //add Checksum |
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| 56 | u16 crc = 0; |
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| 57 | u8 crc1, crc2; |
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| 58 | for (int i = 0; i < u; i++) |
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| 59 | { |
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| 60 | crc += pdata_package->txrxdata[i]; |
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| 61 | } |
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| 62 | crc %= 4096; |
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| 63 | crc1 = '=' + crc / 64; |
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| 64 | crc2 = '=' + crc % 64; |
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| 65 | pdata_package->txrxdata[u++] = crc1; |
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| 66 | pdata_package->txrxdata[u++] = crc2; |
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| 67 | pdata_package->txrxdata[u++] = '\r'; |
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| 68 | |||
| 69 | pdata_package->cmdLength = u; |
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| 70 | } |
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| 71 | |||
| 72 | |||
| 73 | //>> Initializing serial interface |
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| 74 | //------------------------------------------------------------------------------------------------------ |
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| 75 | void uart_init(){ |
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| 76 | uart0_filestream = open(SERIAL, O_RDWR | O_NOCTTY | O_NDELAY); |
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| 77 | if (uart0_filestream == -1) |
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| 78 | { |
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| 79 | printf("Error - Unable to open UART. Ensure it is not in use by another application\n"); |
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| 80 | } |
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| 81 | //UART Options |
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| 82 | struct termios options; |
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| 83 | tcgetattr(uart0_filestream, &options); |
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| 84 | options.c_cflag = B57600 | CS8 | CLOCAL | CREAD; |
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| 85 | options.c_iflag = IGNPAR; |
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| 86 | options.c_oflag = 0; |
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| 87 | options.c_lflag = 0; |
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| 88 | tcflush(uart0_filestream, TCIFLUSH); |
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| 89 | tcsetattr(uart0_filestream, TCSANOW, &options); |
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| 90 | //UART Options |
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| 91 | } |