Richard Osterloh
Simple program to enable me to write to a 128x64 OLED display over BLE
Dependencies: Adafruit_GFX BLE_API mbed nRF51822 SemVer
Revision 0:d89c10040630, committed 2015-03-30
- Comitter:
- rosterloh84
- Date:
- Mon Mar 30 10:06:34 2015 +0000
- Child:
- 1:9e9c52d8270a
- Commit message:
- First working version
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Adafruit_GFX.lib Mon Mar 30 10:06:34 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/nkhorman/code/Adafruit_GFX/#7fb1d4d3525d
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/BLE_API.lib Mon Mar 30 10:06:34 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/teams/Bluetooth-Low-Energy/code/BLE_API/#8c645f5694b2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Mar 30 10:06:34 2015 +0000
@@ -0,0 +1,166 @@
+/**
+ * @file
+ * @date 30 March 2015
+ * @author Richard Osterloh <richard.osterloh@gmail.com>
+ */
+
+#include "mbed.h"
+#include "BLEDevice.h"
+#include "UARTService.h"
+
+#include "Adafruit_SSD1306.h"
+
+#define NEED_CONSOLE_OUTPUT 1 /* Set this if you need debug messages on the console;
+ * it will have an impact on code-size and power consumption. */
+
+#if NEED_CONSOLE_OUTPUT
+#define DEBUG(STR) { if (uartServicePtr) uartServicePtr->writeString(STR); }
+#else
+#define DEBUG(...) /* nothing */
+#endif /* #if NEED_CONSOLE_OUTPUT */
+
+BLEDevice ble;
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+
+InterruptIn btn1(BUTTON1);
+
+DigitalOut oled_gnd(p3);
+
+// an I2C sub-class that provides a constructed default
+class I2CPreInit : public I2C
+{
+public:
+ I2CPreInit(PinName sda, PinName scl) : I2C(sda, scl)
+ {
+ oled_gnd = 0;
+ frequency(400000);
+ start();
+ };
+};
+
+I2CPreInit gI2C(p5, p4); // SDA, SCL
+Adafruit_SSD1306_I2c gOled(gI2C, p2, 0x78, 64, 128); // I2C, RST, ADDRESS, WIDTH, HEIGHT
+
+bool rxPayloadUpdated = false;
+const static unsigned MAX_SIZEOF_RX_PAYLOAD = 20;
+char rxPayload[MAX_SIZEOF_RX_PAYLOAD] = {0,};
+
+UARTService *uartServicePtr;
+
+const char *deviceName = "BLE DISPLAY";
+
+/**
+ * Callback to write to connected client and display
+ */
+void buttonCallback(void)
+{
+ if(btn1) {
+ gOled.clearDisplay();
+ gOled.printf("%s", "BTN 0 released");
+ gOled.display();
+ uartServicePtr->writeString("Button 0 released\r\n");
+ } else {
+ gOled.clearDisplay();
+ gOled.printf("%s", "BTN 0 pressed");
+ gOled.display();
+ uartServicePtr->writeString("Button 0 pressed\r\n");
+ }
+}
+
+/**
+ * Callback when new client connects to device
+ *
+ * @param tHandle handle to this specific client
+ * @param ePeerAddrType the type of the connected clients address
+ * @param c6PeerAddr the address of the connected client
+ * @param params requested connection parameters
+ */
+void connectionCallback(Gap::Handle_t tHandle, Gap::addr_type_t ePeerAddrType, const Gap::address_t c6PeerAddr, const Gap::ConnectionParams_t *params)
+{
+ //DEBUG("CONNECT: Handle:%u, eType:%d, Add:%u\r\n", tHandle, ePeerAddrType, c6PeerAddr);
+ //DEBUG(" minInterval:%d, maxInterval:%d, latency:%d, timeout:%d\r\n",
+ // params->minConnectionInterval, params->maxConnectionInterval, params->slaveLatency, params->connectionSupervisionTimeout);
+ DEBUG("CONNECTED\r\n");
+ led2 = 1; led4 = 0;
+}
+
+/**
+ * Callback called when a client disconnects
+ *
+ * @param tHandle handle of the disconnected client
+ * @param eReason the reason they disconnected
+ */
+void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)
+{
+ DEBUG("Disconnected!\n\r");
+ DEBUG("Restarting the advertising process\n\r");
+ ble.startAdvertising();
+ led2 = 0; led4 = 1;
+}
+
+/**
+ * Callback called when a client writes to this device
+ *
+ * @param params all parameters related to this data
+ */
+void onDataWritten(const GattCharacteristicWriteCBParams *params)
+{
+ if ((uartServicePtr != NULL) && (params->charHandle == uartServicePtr->getTXCharacteristicHandle())) {
+ uint16_t bytesRead = params->len;
+ if (bytesRead < MAX_SIZEOF_RX_PAYLOAD) {
+ strncpy(rxPayload, (const char *)params->data, MAX_SIZEOF_RX_PAYLOAD - 1);
+ rxPayload[bytesRead] = '\0';
+ rxPayloadUpdated = true;
+ ble.updateCharacteristicValue(uartServicePtr->getRXCharacteristicHandle(), params->data, bytesRead);
+ }
+ }
+}
+
+void periodicCallback(void)
+{
+ led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
+}
+
+int main(void)
+{
+ led1 = 1; led2 = 1; led3 = 1; led4 = 1;
+ Ticker ticker;
+ ticker.attach(periodicCallback, 1);
+ btn1.fall(buttonCallback);
+ btn1.rise(buttonCallback);
+
+ DEBUG("Initialising the nRF51822\n\r");
+ ble.init();
+ ble.onConnection(connectionCallback);
+ ble.onDisconnection(disconnectionCallback);
+ ble.onDataWritten(onDataWritten);
+
+ /* setup advertising */
+ ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
+ ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
+ ble.accumulateAdvertisingPayload(GapAdvertisingData::SHORTENED_LOCAL_NAME, (const uint8_t *)deviceName, strlen(deviceName));
+ /*ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_128BIT_SERVICE_IDS,
+ (const uint8_t *)UARTServiceUUID_reversed, sizeof(UARTServiceUUID_reversed));*/
+
+ ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
+ ble.startAdvertising();
+
+ UARTService uartService(ble);
+ uartServicePtr = &uartService;
+
+ while (true) {
+ if (rxPayloadUpdated) {
+ gOled.clearDisplay();
+ gOled.printf("%s", rxPayload);
+ gOled.display();
+
+ rxPayloadUpdated = false;
+ }
+
+ ble.waitForEvent();
+ }
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Mar 30 10:06:34 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/487b796308b0 \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/nRF51822.lib Mon Mar 30 10:06:34 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/teams/Nordic-Semiconductor/code/nRF51822/#bdc690669431