Gymtrack / RFIDTestNFC

interrupt handling

Dependencies:  

main.cpp@1:1eb96189824d, 2015-03-02 (annotated)

Committer:
rwclough
Date:
Mon Mar 02 19:50:31 2015 +0000
Revision:
1:1eb96189824d
Parent:
0:5622c60e9d3a
Child:
2:bd5afc5aa139
The SPI interface between nRF51-DK and TRF7970 eval board works such that RAM_0 register can be written and read. Test values are 0xAA and 0x55.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rwclough 1:1eb96189824d 1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
rwclough 1:1eb96189824d 2 Filename: main.c
rwclough 1:1eb96189824d 3 Description: Interface nRF51-DK eval board to TRF7970 eval board
rwclough 1:1eb96189824d 4 to test the suitability of the TRF7970 NFC chip
rwclough 1:1eb96189824d 5 for use in Gymtrack products.
rwclough 1:1eb96189824d 6 The nRF51-DK board has an nRF51422 MCU.
rwclough 1:1eb96189824d 7 Copyright (C) 2015 Gymtrack, Inc.
rwclough 1:1eb96189824d 8 Author: Ron Clough
rwclough 1:1eb96189824d 9 Date: 2015-02-26
rwclough 1:1eb96189824d 10
rwclough 1:1eb96189824d 11 Changes:
rwclough 1:1eb96189824d 12 Rev Date Who Details
rwclough 1:1eb96189824d 13 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
rwclough 1:1eb96189824d 14 0.0 2015-02-26 RWC Original version.
rwclough 1:1eb96189824d 15
rwclough 1:1eb96189824d 16 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
rwclough 0:5622c60e9d3a 17
rwclough 1:1eb96189824d 18 #include "mbed.h"
rwclough 1:1eb96189824d 19 #include "main.h"
rwclough 1:1eb96189824d 20 #include "readerComm.h"
rwclough 0:5622c60e9d3a 21
rwclough 1:1eb96189824d 22 SPI spi(p25, p28, p29); // MOSI, MISO, SCLK
rwclough 1:1eb96189824d 23 DigitalOut CS(p11); // Slave Select (SS)
rwclough 1:1eb96189824d 24 Serial pc(USBTX, USBRX); // Serial communication over USB with PC
rwclough 1:1eb96189824d 25 DigitalOut heartbeatLED(LED1); // Heartbeat LED
rwclough 1:1eb96189824d 26 InterruptIn readerInt(p7); // Interrupt from TRF7970
rwclough 1:1eb96189824d 27 DigitalOut ook_ask(p6); // Control ASK/OOK pin on TRF7970
rwclough 1:1eb96189824d 28 DigitalOut mod(p5); // Control MOD pin on TRF7970
rwclough 1:1eb96189824d 29 DigitalOut enable(p4); // Control EN pin on TRF7970
rwclough 1:1eb96189824d 30 DigitalOut enable2(p3); // Control EN2 pin on TRF7970
rwclough 0:5622c60e9d3a 31
rwclough 1:1eb96189824d 32 int buffer[2];
rwclough 0:5622c60e9d3a 33
rwclough 1:1eb96189824d 34 void blinkHeartbeatLED(void) {
rwclough 1:1eb96189824d 35 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
rwclough 1:1eb96189824d 36 // blinkHeartbeatLED()
rwclough 1:1eb96189824d 37 // Description: Toogle the heartbeat LED.
rwclough 1:1eb96189824d 38 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
rwclough 1:1eb96189824d 39 heartbeatLED = !heartbeatLED;
rwclough 1:1eb96189824d 40 } // End of blinkHeartbeatLED()
rwclough 0:5622c60e9d3a 41
rwclough 1:1eb96189824d 42 void intHandler() {
rwclough 1:1eb96189824d 43 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
rwclough 1:1eb96189824d 44 // intHandler()
rwclough 1:1eb96189824d 45 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
rwclough 1:1eb96189824d 46 printf("Got Interrupt!\r\n");
rwclough 1:1eb96189824d 47 } // End of intHandler()
rwclough 0:5622c60e9d3a 48
rwclough 1:1eb96189824d 49 int main() {
rwclough 1:1eb96189824d 50 // Power up sequence
rwclough 1:1eb96189824d 51 CS = 0; enable2 = 0; enable = 0;
rwclough 1:1eb96189824d 52 wait_ms(2);
rwclough 1:1eb96189824d 53 CS = DESELECT;
rwclough 1:1eb96189824d 54 wait_ms(3);
rwclough 1:1eb96189824d 55 enable2 = 1;
rwclough 1:1eb96189824d 56 wait_ms(1);
rwclough 1:1eb96189824d 57 enable = 1;
rwclough 1:1eb96189824d 58
rwclough 1:1eb96189824d 59 mod = 0;
rwclough 1:1eb96189824d 60
rwclough 1:1eb96189824d 61 // Setup serial communication
rwclough 0:5622c60e9d3a 62 pc.baud(115200);
rwclough 1:1eb96189824d 63 printf("Initialization: ");
rwclough 1:1eb96189824d 64
rwclough 1:1eb96189824d 65 // Setup heartbeat LED
rwclough 1:1eb96189824d 66 heartbeatLED = LED_OFF;
rwclough 1:1eb96189824d 67 Ticker heartbeat;
rwclough 1:1eb96189824d 68 heartbeat.attach(blinkHeartbeatLED, 1);
rwclough 1:1eb96189824d 69 printf("Heartbeat, ");
rwclough 1:1eb96189824d 70
rwclough 1:1eb96189824d 71 // Setup the SPI interface
rwclough 1:1eb96189824d 72 spi.format(8, 3); // 8 bit data, mode = 3
rwclough 1:1eb96189824d 73 spi.frequency(1000000); // SCLK = 1 MHz
rwclough 1:1eb96189824d 74 printf("SPI, ");
rwclough 1:1eb96189824d 75
rwclough 1:1eb96189824d 76 // Set On-Off Keying modulation
rwclough 1:1eb96189824d 77 ook_ask = 1;
rwclough 1:1eb96189824d 78 printf("OOK, ");
rwclough 1:1eb96189824d 79
rwclough 1:1eb96189824d 80 // Establish communication with the TRF7970
rwclough 1:1eb96189824d 81 firstComm();
rwclough 1:1eb96189824d 82 printf("Communication established, ");
rwclough 1:1eb96189824d 83
rwclough 1:1eb96189824d 84 // Setup interrupt from TRF7970
rwclough 1:1eb96189824d 85 readerInt.rise(&intHandler); // Interrupt on rising edge, call intHandler()
rwclough 1:1eb96189824d 86 printf("Interrupt enabled, ");
rwclough 1:1eb96189824d 87
rwclough 1:1eb96189824d 88 printf("finished initialization.\r\n");
rwclough 1:1eb96189824d 89
rwclough 1:1eb96189824d 90 // Begin Test
rwclough 1:1eb96189824d 91 buffer[0] = RAM_0; // Address 0x12
rwclough 1:1eb96189824d 92 buffer[1] = 0x55;
rwclough 1:1eb96189824d 93 writeSingle(buffer, 2);
rwclough 1:1eb96189824d 94 wait_ms(100);
rwclough 1:1eb96189824d 95 readSingle(buffer, 1);
rwclough 1:1eb96189824d 96 printf("Reg[0]: 0x%X\r\n", buffer[0]);
rwclough 1:1eb96189824d 97 printf("Reg[1]: 0x%X\r\n", buffer[1]);
rwclough 1:1eb96189824d 98
rwclough 1:1eb96189824d 99 buffer[0] = RAM_0; // Address 0x12
rwclough 1:1eb96189824d 100 buffer[1] = 0xAA;
rwclough 1:1eb96189824d 101 writeSingle(buffer, 2);
rwclough 1:1eb96189824d 102 wait_ms(100);
rwclough 1:1eb96189824d 103 readSingle(buffer, 1);
rwclough 1:1eb96189824d 104 printf("Reg[0]: 0x%X\r\n", buffer[0]);
rwclough 1:1eb96189824d 105 printf("Reg[1]: 0x%X\r\n", buffer[1]);
rwclough 1:1eb96189824d 106 // End Test
rwclough 1:1eb96189824d 107
rwclough 1:1eb96189824d 108 wait(1);
rwclough 1:1eb96189824d 109
rwclough 1:1eb96189824d 110 while(TRUE) {
rwclough 1:1eb96189824d 111 printf("Got here . . . Yeah!\r\n");
rwclough 1:1eb96189824d 112 wait_ms(1000);
rwclough 0:5622c60e9d3a 113 }
rwclough 1:1eb96189824d 114 } // End of main()