Garima Gupta
Use of nRF51822 to demonstrate usage of BLE-UART service provided by Nordic and the use of uLCD-144-G2. The demonstration uses the nRF Master Control Panel and nRF UART demo apps provided by Nordic and available on Google Play and Apple Store. The firmware receives data over the TX characteristic, increments it by 1 and sends it over RX characteristic. The notifications need to be enabled for the RX characteristic in the Master Control Panel to be able to receive the data. For more information check the notebook page: http://developer.mbed.org/users/garimagupta002/notebook/ble-uart-lcd-demo/
Dependencies: 4DGL-uLCD-SE BLE_API DFRobot_BLE_LoopbackUART mbed nRF51822
Fork of
DFRobot_BLE_LoopbackUART
by 
Angelo qiao
Diff: main.cpp
- Revision:
- 5:4bc41267a03a
- Parent:
- 2:e060367b9024
- Child:
- 6:e0fc9072e853
--- a/main.cpp Fri Jun 13 12:13:02 2014 +0000
+++ b/main.cpp Tue Sep 02 16:32:58 2014 +0000
@@ -21,7 +21,7 @@
#define BLE_UUID_NUS_TX_CHARACTERISTIC 0x0002 /**< The UUID of the TX Characteristic. */
#define BLE_UUID_NUS_RX_CHARACTERISTIC 0x0003 /**< The UUID of the RX Characteristic. */
-#define NEED_CONSOLE_OUTPUT 0 /* Set this if you need debug messages on the console;
+#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
@@ -39,30 +39,34 @@
static const uint8_t uart_tx_uuid[] = {0x6e, 0x40, 0x00, 0x02, 0xb5, 0xa3, 0xf3, 0x93, 0xe0, 0xa9, 0xe5,0x0e, 0x24, 0xdc, 0xca, 0x9e};
static const uint8_t uart_rx_uuid[] = {0x6e, 0x40, 0x00, 0x03, 0xb5, 0xa3, 0xf3, 0x93, 0xe0, 0xa9, 0xe5,0x0e, 0x24, 0xdc, 0xca, 0x9e};
static const uint8_t uart_base_uuid_rev[] = {0x9e, 0xca, 0xdc, 0x24, 0x0e, 0xe5, 0xa9, 0xe0, 0x93, 0xf3, 0xa3, 0xb5, 0x01, 0x00, 0x40, 0x6e};
-uint8_t txPayload[8] = {0,};
-uint8_t rxPayload[8] = {0,};
-GattCharacteristic txCharacteristic (uart_tx_uuid, txPayload, 1, 8,
+
+static const uint8_t SIZEOF_TX_RX_BUFFER = 128;
+uint8_t rxPayload[SIZEOF_TX_RX_BUFFER] = {0,};
+uint8_t txPayload[SIZEOF_TX_RX_BUFFER] = {0,};
+GattCharacteristic rxCharacteristic (uart_tx_uuid, rxPayload, 1, SIZEOF_TX_RX_BUFFER,
GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE);
-GattCharacteristic rxCharacteristic (uart_rx_uuid, rxPayload, 1, 8,
- GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
-GattCharacteristic *uartChars[] = {&txCharacteristic, &rxCharacteristic};
+GattCharacteristic txCharacteristic (uart_rx_uuid, txPayload, 1, SIZEOF_TX_RX_BUFFER, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
+GattCharacteristic *uartChars[] = {&rxCharacteristic, &txCharacteristic};
GattService uartService(uart_base_uuid, uartChars, sizeof(uartChars) / sizeof(GattCharacteristic *));
-void disconnectionCallback(void)
+void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)
{
DEBUG("Disconnected!\n\r");
DEBUG("Restarting the advertising process\n\r");
ble.startAdvertising();
}
-void onDataWritten(uint16_t charHandle)
+void onDataWritten(uint16_t charHandle, const GattCharacteristicWriteCBParams *params)
{
- if (charHandle == txCharacteristic.getHandle()) {
- DEBUG("onDataWritten()\n\r");
- uint16_t bytesRead;
- ble.readCharacteristicValue(txCharacteristic.getHandle(), txPayload, &bytesRead);
- DEBUG("ECHO: %s\n\r", (char *)txPayload);
- ble.updateCharacteristicValue(rxCharacteristic.getHandle(), txPayload, bytesRead);
+ if (charHandle == rxCharacteristic.getValueAttribute().getHandle()) {
+ uint16_t bytesRead = params->len;
+ DEBUG("received %u bytes\n\r", bytesRead);
+ if (bytesRead < sizeof(rxPayload)) {
+ memcpy(rxPayload, params->data, bytesRead);
+ rxPayload[bytesRead] = 0;
+ }
+ DEBUG("ECHO: %s\n\r", (char *)rxPayload);
+ ble.updateCharacteristicValue(txCharacteristic.getValueAttribute().getHandle(), rxPayload, bytesRead);
}
}