1 | #include <stdio.h>
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2 | #include <inttypes.h>
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3 | #include <string.h>
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4 | #include <errno.h>
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5 | #include <stdlib.h>
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6 | #include "spi_Comm_Handler.h"
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7 | #include <wiringPi.h>
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8 | #include <wiringPiSPI.h>
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9 |
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10 |
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11 | volatile uint8_t dbg_SPIKnockCounter = 0;
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12 | volatile uint8_t transferArray[SPI_TRANSFERDATASIZE] = {0, };
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13 |
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14 |
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15 | /* ISR for slave knock Pin */
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16 | void slaveKnockHandler (void) {
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17 | printf("Slave request\n");
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18 | dbg_SPIKnockCounter++ ;
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19 | flush_Transfer_Buffer();
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20 | send_SPI_Frame();
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21 | }
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22 |
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23 | int init_SPI_Comm_Handler(void) {
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24 | int spidev;
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25 | printf ( "sizeof(transferArray): %d\n", sizeof(transferArray)) ;
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26 | if (wiringPiSetup () < 0) {
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27 | fprintf (stderr, "Unable to setup wiringPi: %s\n", strerror (errno)) ;
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28 | return 0 ;
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29 | }
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30 |
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31 | spidev = wiringPiSPISetup (0, 500000) ;
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32 | if (spidev == -1) {
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33 | fprintf (stderr, "Unable to setup SPI: %s\n", strerror (errno)) ;
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34 | return 0 ;
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35 | }
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36 |
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37 | pinMode (SLAVE_KNOCK_PIN, INPUT) ;
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38 |
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39 | if (wiringPiISR (SLAVE_KNOCK_PIN, INT_EDGE_FALLING, &slaveKnockHandler) < 0) {
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40 | fprintf (stderr, "Unable to setup ISR: %s\n", strerror (errno)) ;
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41 | return 0 ;
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42 | }
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43 |
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44 | spi_writeLCD(0, 0, "Hello Raspi here");
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45 |
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46 | return 1 ;
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47 | }
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48 |
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49 | void flush_Transfer_Buffer(void){
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50 | uint8_t c = 0;
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51 |
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52 | for (c = 0; c < SPI_TRANSFERDATASIZE; c++) {
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53 | transferArray[c] = 0;
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54 | }
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55 | }
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56 |
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57 | void send_SPI_Frame(void){
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58 |
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59 | if (wiringPiSPIDataRW (0, (unsigned char *)transferArray, SPI_TRANSFERDATASIZE)) {
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60 | handle_incoming_SPI_Data();
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61 | } else {
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62 | fprintf (stderr, "Error in Transfer\n") ;
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63 | }
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64 | }
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65 |
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66 | void showRData(void) {
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67 |
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68 | uint8_t c = 0;
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69 |
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70 | for (c = 0; c < SPI_TRANSFERDATASIZE; c++) {
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71 | printf(" %d ", transferArray[c]);
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72 | }
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73 | printf("\n");
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74 | return;
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75 |
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76 | }
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77 |
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78 | /*
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79 | * to prevent recursive traffic
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80 | * here we cannot call to transfer another data
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81 | */
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82 | void handle_incoming_SPI_Data(void) {
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83 | showRData();
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84 | }
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