File content as of revision 1:9b27a9710d94:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 *  ------- BLE Peripheral UART function --------------------------------
 *      --- Tested on Switch Science mbed TY51822r3 ---
 *
 *      http://www.page.sannet.ne.jp/kenjia/index.html
 *      http://mbed.org/users/kenjiArai/
 *
 *      Started:  March     7th, 2016
 *      Revised:  April    16th, 2016
 *
 *  Original program:
 *      BLE_LoopbackUART
 *      https://developer.mbed.org/teams/Bluetooth-Low-Energy/code/BLE_LoopbackUART/
 *  Tested Controller Device:
 *      BLE_Uart_Client
 *      https://developer.mbed.org/users/kenjiArai/code/BLE_Uart_Client/
 *
 */

//  Include ---------------------------------------------------------------------------------------
#include "mbed.h"
#include "BLE.h"
#include "UARTService.h"
#include "nRF51_Vdd.h"
#include "nRF51_WakeUp.h"

//  Definition ------------------------------------------------------------------------------------
#define GOTO_SLEEP_MODE         0
#define NEED_CONSOLE_OUTPUT     0

#if NEED_CONSOLE_OUTPUT
#define DEBUG(...) { printf(__VA_ARGS__); }
#else
#define DEBUG(...)
#endif

//  Object ----------------------------------------------------------------------------------------
BLEDevice       ble;
DigitalOut      connectedLED(LED2);
InterruptIn     wake_up_sw(P0_1);
nRF51_WakeUp    wakeup(LED1, P0_0);
nRF51_Vdd       vdd(3.0f, 2.2f);
Serial          pc(USBTX, USBRX);
UARTService     *uartServicePtr;
Ticker          ticker;

//  ROM / Constant data ---------------------------------------------------------------------------
#warning "You need to confirm your device name."
const char      *deviceName = "UART_P";

//  RAM -------------------------------------------------------------------------------------------
uint8_t             tx_buf[24];
uint8_t             tx_len          = 0;
uint8_t             rx_buf[24];
uint8_t             rx_len          = 0;
volatile bool    trigger_transmit   = false;
volatile bool    trigger_receive    = false;
volatile uint8_t command_continue   = 0;
uint16_t            time_out_cntr   = 3600;
volatile bool       time_out        = false;
bool                line_input      = false;
uint8_t             linebuf_irq[24];
int                 linebf_irq_len  = 0;
uint8_t             linebuf[24];
int                 linebf_len      = 0;

//  Function prototypes ---------------------------------------------------------------------------
//      BLE
void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params);
void onDataWritten(const GattWriteCallbackParams *params);
void periodicCallback(void);
//      Application related
void adjust_line(uint8_t *bf);
void action_tx_help(void);
void action_tx_vdd(void);
void action_tx_temperature(void);
void action_tx_pwrup(void);
void action_tx_pwrdwn(void);
void fill_space_n(uint8_t *bf, uint8_t n);
void Update_Values(void);
//      Interrupt related
void action_tx_quit(void);
void interrupt_by_sw(void);
void serialRxCallback(void);

//-------------------------------------------------------------------------------------------------
//  Control Program
//-------------------------------------------------------------------------------------------------
int main(void){
    connectedLED = 0;
    pc.attach(&serialRxCallback, Serial::RxIrq);
    ticker.attach(periodicCallback, 1);
    for (int k = 0; k < 20; k++) { pc.printf("\r\n");}          // clear terminal output
    pc.printf("UART Communication / Peripheral side\r\n");      // opening message
    pc.printf("  Client(Central) and Peripheral(device)\r\n");  // opening message
    // Interrupt by switch
    wake_up_sw.fall(&interrupt_by_sw);
    ble.init();
    ble.setDeviceName((const uint8_t *)deviceName);
    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)
                                    );
    // Advertize Interval
    ble.setAdvertisingInterval(1000); /* 1000ms; in multiples of 0.625ms. */
    // Start
    ble.startAdvertising();
    UARTService uartService(ble);
    uartServicePtr = &uartService;
    while(true){
        if (time_out){
#if GOTO_SLEEP_MODE
            wakeup.set_and_wait(10);
            while(true){    // never come here but just in case
                deepsleep();
            }
#endif
        }
        if (line_input){
            line_input = false;
            adjust_line(linebuf);
            ble.updateCharacteristicValue(
                uartServicePtr->getRXCharacteristicHandle(),
                linebuf,
                20
            );
        }
        if (trigger_transmit){
            trigger_transmit = false;
            pc.printf("%s\r\n", rx_buf);
            if (rx_buf[0] == '*'){          
                switch (rx_buf[1]){
                    case 'v':
                        action_tx_vdd();
                        break;
                    case 't':
                        action_tx_temperature();
                        break;
                    case 'q':
                        action_tx_quit();
                        break;
                    case 'h':
                    case '?':
                        action_tx_help();
                        break;
                    default:
                        break;
                }
            }
        }
        ble.waitForEvent();        
    }
}

void serialRxCallback(){
    char c = pc.getc();
    if (c == '\r') {
        linebuf_irq[linebf_irq_len++] = c;
        pc.printf("\r\n");
        linebf_len = linebf_irq_len;
        strcpy((char *)linebuf, (char *)linebuf_irq);
        linebf_irq_len = 0;
        line_input = true;
    } else if ((c == '\b') && linebf_irq_len) {
        linebf_irq_len--;
        pc.putc(c);
        pc.putc(' ');
        pc.putc(c);
    } else if (((uint8_t)c >= ' ') && (linebf_irq_len < 20)) {
        linebuf_irq[linebf_irq_len++] = c;
        pc.putc(c);
    } else if ( c == 0x1f ){    // Control+?
        SCB->AIRCR = 0x05fa0004;    // System RESET!!
    }
    linebuf_irq[linebf_irq_len] = 0; 
}

void adjust_line(uint8_t *bf){
uint8_t i, c;

    for (i = 0; i <20; bf++, i++){
        c = *bf;
        if ( (c == '\r') || (c == '\n') || (c == 0)){
            break;
        }
    }
    for (; i < 20; bf++, i++){
        *bf = ' ';
    }
    *(bf + 1) = 0;
}

void onDataWritten(const GattWriteCallbackParams *params){
    if ((uartServicePtr != NULL) && 
        (params->handle == uartServicePtr->getTXCharacteristicHandle()))
    {
        strcpy((char *)rx_buf, (const char *)params->data);
        rx_len = params->len;
        trigger_transmit = true;
        DEBUG("RX_data\r\n");
        DEBUG("Length: %d\r\n", rx_len);
        DEBUG("Data: ");
        DEBUG("%s", rx_buf);
        DEBUG("\r\n");
    }
}

void action_tx_help(){
                //          12345678901234567890
    sprintf((char *)tx_buf,"?:help by JH1PJL");
    tx_len = strlen((const char *)tx_buf); 
    Update_Values();
    wait(0.2);
                //          12345678901234567890
    sprintf((char *)tx_buf,"v:vdd");
    tx_len = strlen((const char *)tx_buf); 
    Update_Values();
    wait(0.2);
                //          12345678901234567890
    sprintf((char *)tx_buf,"t:temperature");
    tx_len = strlen((const char *)tx_buf); 
    Update_Values();
    wait(0.2);
                //          12345678901234567890
    sprintf((char *)tx_buf,"q:quit/sleep");
    tx_len = strlen((const char *)tx_buf); 
    Update_Values();
    wait(0.2);
}

void action_tx_vdd(){
    sprintf((char *)tx_buf,"Vdd:%3.2fV", vdd.read_real_value());
    tx_len = strlen((const char *)tx_buf);
    Update_Values();
}

void action_tx_temperature(){
    int32_t p_temp;
    float temperature;
 
    // Update a temperature (inside nRF51822 chip)
    sd_temp_get(&p_temp);
    // -16.0f is offset vale for chip die temp to ambient temp (depend on your board)
    temperature = float(p_temp) / 4; // Original = float(p_temp)/4.0f - 16.0f;
    sprintf((char *)tx_buf,"T:%+4.1fdC", temperature);
    tx_len = strlen((const char *)tx_buf);
    Update_Values();
}

void action_tx_quit(){
#if GOTO_SLEEP_MODE 
    ticker.detach();
                //          12345678901234567890
    sprintf((char *)tx_buf,"Terminated the BLE");
    tx_len = strlen((const char *)tx_buf); 
    Update_Values();
    wait(1.0);
    wakeup.set_and_wait(120);
    while(true){    // never come here but just in case
        deepsleep();
    }
#else
    SCB->AIRCR = 0x05fa0004;    // System RESET!!
#endif
}

void interrupt_by_sw(){         // Go to sleep
    NVIC_SystemReset();
    // Not come here (Just in case)
    deepsleep();
}

void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params){
    DEBUG("Disconnected!\r\n");
    DEBUG("Restarting the advertising process\r\n");
    ble.startAdvertising();
}

void periodicCallback(void){
#if GOTO_SLEEP_MODE
    if (--time_out_cntr == 0){
        time_out = true;
    }
#endif
}

void Update_Values(void){
    ble.updateCharacteristicValue(
        uartServicePtr->getRXCharacteristicHandle(),
        tx_buf,
        tx_len
    );
    DEBUG("TX_data: %s\r\n", tx_buf);
    DEBUG("Length: %d\r\n", tx_len);
    tx_len = 0;
}