![](/media/cache/profiles/f8936fbd065f5b9fdb3149eaba9665df.50x50_q85.jpg)
Simple program to enable me to write to a 128x64 OLED display over BLE
Dependencies: Adafruit_GFX BLE_API mbed nRF51822 SemVer
main.cpp@0:d89c10040630, 2015-03-30 (annotated)
- Committer:
- rosterloh84
- Date:
- Mon Mar 30 10:06:34 2015 +0000
- Revision:
- 0:d89c10040630
- Child:
- 1:9e9c52d8270a
First working version
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
rosterloh84 | 0:d89c10040630 | 1 | /** |
rosterloh84 | 0:d89c10040630 | 2 | * @file |
rosterloh84 | 0:d89c10040630 | 3 | * @date 30 March 2015 |
rosterloh84 | 0:d89c10040630 | 4 | * @author Richard Osterloh <richard.osterloh@gmail.com> |
rosterloh84 | 0:d89c10040630 | 5 | */ |
rosterloh84 | 0:d89c10040630 | 6 | |
rosterloh84 | 0:d89c10040630 | 7 | #include "mbed.h" |
rosterloh84 | 0:d89c10040630 | 8 | #include "BLEDevice.h" |
rosterloh84 | 0:d89c10040630 | 9 | #include "UARTService.h" |
rosterloh84 | 0:d89c10040630 | 10 | |
rosterloh84 | 0:d89c10040630 | 11 | #include "Adafruit_SSD1306.h" |
rosterloh84 | 0:d89c10040630 | 12 | |
rosterloh84 | 0:d89c10040630 | 13 | #define NEED_CONSOLE_OUTPUT 1 /* Set this if you need debug messages on the console; |
rosterloh84 | 0:d89c10040630 | 14 | * it will have an impact on code-size and power consumption. */ |
rosterloh84 | 0:d89c10040630 | 15 | |
rosterloh84 | 0:d89c10040630 | 16 | #if NEED_CONSOLE_OUTPUT |
rosterloh84 | 0:d89c10040630 | 17 | #define DEBUG(STR) { if (uartServicePtr) uartServicePtr->writeString(STR); } |
rosterloh84 | 0:d89c10040630 | 18 | #else |
rosterloh84 | 0:d89c10040630 | 19 | #define DEBUG(...) /* nothing */ |
rosterloh84 | 0:d89c10040630 | 20 | #endif /* #if NEED_CONSOLE_OUTPUT */ |
rosterloh84 | 0:d89c10040630 | 21 | |
rosterloh84 | 0:d89c10040630 | 22 | BLEDevice ble; |
rosterloh84 | 0:d89c10040630 | 23 | DigitalOut led1(LED1); |
rosterloh84 | 0:d89c10040630 | 24 | DigitalOut led2(LED2); |
rosterloh84 | 0:d89c10040630 | 25 | DigitalOut led3(LED3); |
rosterloh84 | 0:d89c10040630 | 26 | DigitalOut led4(LED4); |
rosterloh84 | 0:d89c10040630 | 27 | |
rosterloh84 | 0:d89c10040630 | 28 | InterruptIn btn1(BUTTON1); |
rosterloh84 | 0:d89c10040630 | 29 | |
rosterloh84 | 0:d89c10040630 | 30 | DigitalOut oled_gnd(p3); |
rosterloh84 | 0:d89c10040630 | 31 | |
rosterloh84 | 0:d89c10040630 | 32 | // an I2C sub-class that provides a constructed default |
rosterloh84 | 0:d89c10040630 | 33 | class I2CPreInit : public I2C |
rosterloh84 | 0:d89c10040630 | 34 | { |
rosterloh84 | 0:d89c10040630 | 35 | public: |
rosterloh84 | 0:d89c10040630 | 36 | I2CPreInit(PinName sda, PinName scl) : I2C(sda, scl) |
rosterloh84 | 0:d89c10040630 | 37 | { |
rosterloh84 | 0:d89c10040630 | 38 | oled_gnd = 0; |
rosterloh84 | 0:d89c10040630 | 39 | frequency(400000); |
rosterloh84 | 0:d89c10040630 | 40 | start(); |
rosterloh84 | 0:d89c10040630 | 41 | }; |
rosterloh84 | 0:d89c10040630 | 42 | }; |
rosterloh84 | 0:d89c10040630 | 43 | |
rosterloh84 | 0:d89c10040630 | 44 | I2CPreInit gI2C(p5, p4); // SDA, SCL |
rosterloh84 | 0:d89c10040630 | 45 | Adafruit_SSD1306_I2c gOled(gI2C, p2, 0x78, 64, 128); // I2C, RST, ADDRESS, WIDTH, HEIGHT |
rosterloh84 | 0:d89c10040630 | 46 | |
rosterloh84 | 0:d89c10040630 | 47 | bool rxPayloadUpdated = false; |
rosterloh84 | 0:d89c10040630 | 48 | const static unsigned MAX_SIZEOF_RX_PAYLOAD = 20; |
rosterloh84 | 0:d89c10040630 | 49 | char rxPayload[MAX_SIZEOF_RX_PAYLOAD] = {0,}; |
rosterloh84 | 0:d89c10040630 | 50 | |
rosterloh84 | 0:d89c10040630 | 51 | UARTService *uartServicePtr; |
rosterloh84 | 0:d89c10040630 | 52 | |
rosterloh84 | 0:d89c10040630 | 53 | const char *deviceName = "BLE DISPLAY"; |
rosterloh84 | 0:d89c10040630 | 54 | |
rosterloh84 | 0:d89c10040630 | 55 | /** |
rosterloh84 | 0:d89c10040630 | 56 | * Callback to write to connected client and display |
rosterloh84 | 0:d89c10040630 | 57 | */ |
rosterloh84 | 0:d89c10040630 | 58 | void buttonCallback(void) |
rosterloh84 | 0:d89c10040630 | 59 | { |
rosterloh84 | 0:d89c10040630 | 60 | if(btn1) { |
rosterloh84 | 0:d89c10040630 | 61 | gOled.clearDisplay(); |
rosterloh84 | 0:d89c10040630 | 62 | gOled.printf("%s", "BTN 0 released"); |
rosterloh84 | 0:d89c10040630 | 63 | gOled.display(); |
rosterloh84 | 0:d89c10040630 | 64 | uartServicePtr->writeString("Button 0 released\r\n"); |
rosterloh84 | 0:d89c10040630 | 65 | } else { |
rosterloh84 | 0:d89c10040630 | 66 | gOled.clearDisplay(); |
rosterloh84 | 0:d89c10040630 | 67 | gOled.printf("%s", "BTN 0 pressed"); |
rosterloh84 | 0:d89c10040630 | 68 | gOled.display(); |
rosterloh84 | 0:d89c10040630 | 69 | uartServicePtr->writeString("Button 0 pressed\r\n"); |
rosterloh84 | 0:d89c10040630 | 70 | } |
rosterloh84 | 0:d89c10040630 | 71 | } |
rosterloh84 | 0:d89c10040630 | 72 | |
rosterloh84 | 0:d89c10040630 | 73 | /** |
rosterloh84 | 0:d89c10040630 | 74 | * Callback when new client connects to device |
rosterloh84 | 0:d89c10040630 | 75 | * |
rosterloh84 | 0:d89c10040630 | 76 | * @param tHandle handle to this specific client |
rosterloh84 | 0:d89c10040630 | 77 | * @param ePeerAddrType the type of the connected clients address |
rosterloh84 | 0:d89c10040630 | 78 | * @param c6PeerAddr the address of the connected client |
rosterloh84 | 0:d89c10040630 | 79 | * @param params requested connection parameters |
rosterloh84 | 0:d89c10040630 | 80 | */ |
rosterloh84 | 0:d89c10040630 | 81 | void connectionCallback(Gap::Handle_t tHandle, Gap::addr_type_t ePeerAddrType, const Gap::address_t c6PeerAddr, const Gap::ConnectionParams_t *params) |
rosterloh84 | 0:d89c10040630 | 82 | { |
rosterloh84 | 0:d89c10040630 | 83 | //DEBUG("CONNECT: Handle:%u, eType:%d, Add:%u\r\n", tHandle, ePeerAddrType, c6PeerAddr); |
rosterloh84 | 0:d89c10040630 | 84 | //DEBUG(" minInterval:%d, maxInterval:%d, latency:%d, timeout:%d\r\n", |
rosterloh84 | 0:d89c10040630 | 85 | // params->minConnectionInterval, params->maxConnectionInterval, params->slaveLatency, params->connectionSupervisionTimeout); |
rosterloh84 | 0:d89c10040630 | 86 | DEBUG("CONNECTED\r\n"); |
rosterloh84 | 0:d89c10040630 | 87 | led2 = 1; led4 = 0; |
rosterloh84 | 0:d89c10040630 | 88 | } |
rosterloh84 | 0:d89c10040630 | 89 | |
rosterloh84 | 0:d89c10040630 | 90 | /** |
rosterloh84 | 0:d89c10040630 | 91 | * Callback called when a client disconnects |
rosterloh84 | 0:d89c10040630 | 92 | * |
rosterloh84 | 0:d89c10040630 | 93 | * @param tHandle handle of the disconnected client |
rosterloh84 | 0:d89c10040630 | 94 | * @param eReason the reason they disconnected |
rosterloh84 | 0:d89c10040630 | 95 | */ |
rosterloh84 | 0:d89c10040630 | 96 | void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason) |
rosterloh84 | 0:d89c10040630 | 97 | { |
rosterloh84 | 0:d89c10040630 | 98 | DEBUG("Disconnected!\n\r"); |
rosterloh84 | 0:d89c10040630 | 99 | DEBUG("Restarting the advertising process\n\r"); |
rosterloh84 | 0:d89c10040630 | 100 | ble.startAdvertising(); |
rosterloh84 | 0:d89c10040630 | 101 | led2 = 0; led4 = 1; |
rosterloh84 | 0:d89c10040630 | 102 | } |
rosterloh84 | 0:d89c10040630 | 103 | |
rosterloh84 | 0:d89c10040630 | 104 | /** |
rosterloh84 | 0:d89c10040630 | 105 | * Callback called when a client writes to this device |
rosterloh84 | 0:d89c10040630 | 106 | * |
rosterloh84 | 0:d89c10040630 | 107 | * @param params all parameters related to this data |
rosterloh84 | 0:d89c10040630 | 108 | */ |
rosterloh84 | 0:d89c10040630 | 109 | void onDataWritten(const GattCharacteristicWriteCBParams *params) |
rosterloh84 | 0:d89c10040630 | 110 | { |
rosterloh84 | 0:d89c10040630 | 111 | if ((uartServicePtr != NULL) && (params->charHandle == uartServicePtr->getTXCharacteristicHandle())) { |
rosterloh84 | 0:d89c10040630 | 112 | uint16_t bytesRead = params->len; |
rosterloh84 | 0:d89c10040630 | 113 | if (bytesRead < MAX_SIZEOF_RX_PAYLOAD) { |
rosterloh84 | 0:d89c10040630 | 114 | strncpy(rxPayload, (const char *)params->data, MAX_SIZEOF_RX_PAYLOAD - 1); |
rosterloh84 | 0:d89c10040630 | 115 | rxPayload[bytesRead] = '\0'; |
rosterloh84 | 0:d89c10040630 | 116 | rxPayloadUpdated = true; |
rosterloh84 | 0:d89c10040630 | 117 | ble.updateCharacteristicValue(uartServicePtr->getRXCharacteristicHandle(), params->data, bytesRead); |
rosterloh84 | 0:d89c10040630 | 118 | } |
rosterloh84 | 0:d89c10040630 | 119 | } |
rosterloh84 | 0:d89c10040630 | 120 | } |
rosterloh84 | 0:d89c10040630 | 121 | |
rosterloh84 | 0:d89c10040630 | 122 | void periodicCallback(void) |
rosterloh84 | 0:d89c10040630 | 123 | { |
rosterloh84 | 0:d89c10040630 | 124 | led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */ |
rosterloh84 | 0:d89c10040630 | 125 | } |
rosterloh84 | 0:d89c10040630 | 126 | |
rosterloh84 | 0:d89c10040630 | 127 | int main(void) |
rosterloh84 | 0:d89c10040630 | 128 | { |
rosterloh84 | 0:d89c10040630 | 129 | led1 = 1; led2 = 1; led3 = 1; led4 = 1; |
rosterloh84 | 0:d89c10040630 | 130 | Ticker ticker; |
rosterloh84 | 0:d89c10040630 | 131 | ticker.attach(periodicCallback, 1); |
rosterloh84 | 0:d89c10040630 | 132 | btn1.fall(buttonCallback); |
rosterloh84 | 0:d89c10040630 | 133 | btn1.rise(buttonCallback); |
rosterloh84 | 0:d89c10040630 | 134 | |
rosterloh84 | 0:d89c10040630 | 135 | DEBUG("Initialising the nRF51822\n\r"); |
rosterloh84 | 0:d89c10040630 | 136 | ble.init(); |
rosterloh84 | 0:d89c10040630 | 137 | ble.onConnection(connectionCallback); |
rosterloh84 | 0:d89c10040630 | 138 | ble.onDisconnection(disconnectionCallback); |
rosterloh84 | 0:d89c10040630 | 139 | ble.onDataWritten(onDataWritten); |
rosterloh84 | 0:d89c10040630 | 140 | |
rosterloh84 | 0:d89c10040630 | 141 | /* setup advertising */ |
rosterloh84 | 0:d89c10040630 | 142 | ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED); |
rosterloh84 | 0:d89c10040630 | 143 | ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED); |
rosterloh84 | 0:d89c10040630 | 144 | ble.accumulateAdvertisingPayload(GapAdvertisingData::SHORTENED_LOCAL_NAME, (const uint8_t *)deviceName, strlen(deviceName)); |
rosterloh84 | 0:d89c10040630 | 145 | /*ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_128BIT_SERVICE_IDS, |
rosterloh84 | 0:d89c10040630 | 146 | (const uint8_t *)UARTServiceUUID_reversed, sizeof(UARTServiceUUID_reversed));*/ |
rosterloh84 | 0:d89c10040630 | 147 | |
rosterloh84 | 0:d89c10040630 | 148 | ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */ |
rosterloh84 | 0:d89c10040630 | 149 | ble.startAdvertising(); |
rosterloh84 | 0:d89c10040630 | 150 | |
rosterloh84 | 0:d89c10040630 | 151 | UARTService uartService(ble); |
rosterloh84 | 0:d89c10040630 | 152 | uartServicePtr = &uartService; |
rosterloh84 | 0:d89c10040630 | 153 | |
rosterloh84 | 0:d89c10040630 | 154 | while (true) { |
rosterloh84 | 0:d89c10040630 | 155 | if (rxPayloadUpdated) { |
rosterloh84 | 0:d89c10040630 | 156 | gOled.clearDisplay(); |
rosterloh84 | 0:d89c10040630 | 157 | gOled.printf("%s", rxPayload); |
rosterloh84 | 0:d89c10040630 | 158 | gOled.display(); |
rosterloh84 | 0:d89c10040630 | 159 | |
rosterloh84 | 0:d89c10040630 | 160 | rxPayloadUpdated = false; |
rosterloh84 | 0:d89c10040630 | 161 | } |
rosterloh84 | 0:d89c10040630 | 162 | |
rosterloh84 | 0:d89c10040630 | 163 | ble.waitForEvent(); |
rosterloh84 | 0:d89c10040630 | 164 | } |
rosterloh84 | 0:d89c10040630 | 165 | } |
rosterloh84 | 0:d89c10040630 | 166 |