1 | // PIC24FJ128GA010 Configuration Bit Settings
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2 |
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3 | // 'C' source line config statements
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4 |
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5 | #include <xc.h>
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6 |
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7 | // CONFIG2
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8 | #pragma config POSCMOD = HS // Primary Oscillator Select (HS Oscillator mode selected)
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9 | #pragma config OSCIOFNC = ON // Primary Oscillator Output Function (OSC2/CLKO/RC15 functions as port I/O (RC15))
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10 | #pragma config FCKSM = CSDCMD // Clock Switching and Monitor (Clock switching and Fail-Safe Clock Monitor are disabled)
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11 | #pragma config FNOSC = PRIPLL // Oscillator Select (Primary Oscillator with PLL module (HSPLL, ECPLL))
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12 | #pragma config IESO = OFF // Internal External Switch Over Mode (IESO mode (Two-Speed Start-up) disabled)
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13 |
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14 | // CONFIG1
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15 | #pragma config WDTPS = PS32768 // Watchdog Timer Postscaler (1:32,768)
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16 | #pragma config FWPSA = PR128 // WDT Prescaler (Prescaler ratio of 1:128)
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17 | #pragma config WINDIS = ON // Watchdog Timer Window (Standard Watchdog Timer enabled,(Windowed-mode is disabled))
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18 | #pragma config FWDTEN = OFF // Watchdog Timer Enable (Watchdog Timer is disabled)
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19 | #pragma config ICS = PGx2 // Comm Channel Select (Emulator/debugger uses EMUC2/EMUD2)
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20 | #pragma config GWRP = OFF // General Code Segment Write Protect (Writes to program memory are allowed)
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21 | #pragma config GCP = OFF // General Code Segment Code Protect (Code protection is disabled)
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22 | #pragma config JTAGEN = OFF // JTAG Port Enable (JTAG port is disabled)
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23 |
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24 | #define FCY 16000000UL // 8 mhz * pll(*4) => 32Mhz == 16Mhz FCY
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25 |
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26 | #include <stdio.h>
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27 | #include <stdlib.h>
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28 |
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29 | void toggle_d9(void) {
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30 | __builtin_btg((unsigned int *) &LATA, 6);
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31 | }
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32 |
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33 | // timing and baud rate calculations
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34 | // UBRGx = ( FCY / ( 4 * Baud ) ) -1 IF BRGH = 1
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35 | // UBRGx = ( FCY / ( 16 * Baud ) ) -1 IF BRGH = 0
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36 | #define BRATE 34 // 115200 baud (BREGH=1)
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37 | #define U_ENABLE 0x8008 // enable the UART peripheral
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38 | #define U_TX 0x0400 // enable transmission
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39 |
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40 | // initialize the UART2 serial port
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41 |
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42 | void InitU2(void) {
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43 | U2BRG = BRATE;
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44 | U2MODE = U_ENABLE;
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45 | U2STA = U_TX;
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46 | //RTS = 1; // set RTS default status
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47 | //TRTS = 0; // make RTS output
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48 | } // initU2
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49 |
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50 | // send a character to the UART2 serial port
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51 |
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52 | int putU2(int c) {
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53 | //while ( CTS); // wait for !CTS, clear to send
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54 | while (U2STAbits.UTXBF); // wait while Tx buffer full
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55 | U2TXREG = c;
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56 | return c;
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57 | } // putU2
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58 |
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59 | // wait for a new character to arrive to the UART2 serial port
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60 |
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61 | char getU2(void) {
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62 | //RTS = 0; // assert Request To Send !RTS
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63 | while (!U2STAbits.URXDA); // wait
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64 | //RTS = 1;
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65 | return U2RXREG; // read from the receive buffer
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66 | }// getU2
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67 |
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68 | /*
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69 | *
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70 | */
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71 | int main(int argc, char** argv) {
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72 |
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73 | unsigned int c = 0x41;
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74 |
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75 | LATAbits.LATA7 = 0; // LED D10 off
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76 | TRISAbits.TRISA7 = 0; // output
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77 | LATAbits.LATA6 = 1; // LED D9 off
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78 | TRISAbits.TRISA6 = 0; // output
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79 |
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80 | // setup/start timer1
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81 | T1CONbits.TCKPS = 0b11; // 1:256
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82 | T1CONbits.TCS = 0; // drive from internal clock
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83 | T1CONbits.TON = 1; // timer on
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84 |
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85 | InitU2();
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86 |
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87 | while (1) {
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88 | __builtin_btg((unsigned int *) &LATA, 7); // toggle LED D10
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89 | TMR1 = 0;
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90 | while (TMR1 < 31250) // ~500ms delay if we realy run at 16Mhz FCY.
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91 | {
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92 | }
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93 |
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94 | putU2(c++);
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95 |
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96 | if (c > (0x41 + 25)) { // A-Z should be received on other end.
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97 | c = 0x41;
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98 | putU2('\r');
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99 | putU2('\n');
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100 | toggle_d9(); // toggle LED D9 every time A-Z characters send.
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101 | }
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102 | }
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103 |
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104 | return (EXIT_SUCCESS
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