【蓝牙4.1试用体验】簡易居家控制系統

2015-12-8 21:01:59 6180 蓝牙

0 本帖最后由 MOPPLAYER 于 2015-12-8 23:26 编辑前言:本篇將快速指引如何建構一個以BLE收集資料和觸發家電開關的項目,因為不拆開電器,所以電器方面我以小風扇來代表實作: 1. 創建PSoC_4_BLE_CapSense_Slider_LED範例專案,我將以這專案為基礎新增功能 2. 新建三個元件,一個Analog,一個Digital Output,一個ADC SAR Seq,我們將讀取Analog訊號來控制Digital輸出 Fig. 1 新增三個元件 3. 其中三個元件設定值如下: Fig. 2 Analog 元件設定 Fig. 3 Digital元件設定 Fig. 4 ADC元件設定,其中主要設定的是Vref select和Single ended negative input決定ADC轉換的電壓範圍,而Clock frequency(或者使用Channel sample rate)設定採樣頻率,其他Sample averaged是採樣多少次來做平均 Fig. 5 ADC元件設定,保留一個Channel 0即可,並勾選AVG設定,以平均採樣的結果,並選擇Single方式 4. 完成設定後,接線圖如下: Fig. 6 接線圖 5. 設定腳位如下,不一定要設定這兩個腳位,但也不是每個腳位都能正確讀取Analog值 Fig. 7 腳位設定 6. 再來開始修改程式碼,仿照CapSense元件透傳方式,新增以下程式碼在main.c中修改程式碼如下: if(TRUE == deviceConnected) { /* After the connection, send new connection parameter to the Client device * to run the BLE communication on desired interval. This affects the data rate * and power consumption. High connection interval will have lower data rate but * lower power consumption. Low connection interval will have higher data rate at * expense of higher power. This function is called only once per connection. / UpdateConnectionParam(); / When the Client Characteristic Configuration descriptor (CCCD) is written * by Central device for enabling/disabling notifications, then the same * descriptor value has to be explicitly updated in application so that * it reflects the correct value when the descriptor is read / UpdateNotificationCCCD(); / Send CapSense Slider data when respective notification is enabled / if(sendCapSenseSliderNotifications & CCCD_NTF_BIT_MASK) { if(CYBLE_BLESS_STATE_ECO_STABLE ==CyBle_GetBleSsState()) { / Check for CapSense slider swipe and send data accordingly / HandleCapSenseSlider(); } } / Send analog data when respective notification is enabled / if(sendAnalogNotifications & CCCD_NTF_BIT_MASK) { if(CYBLE_BLESS_STATE_ECO_STABLE ==CyBle_GetBleSsState()) { / Check for analog reading and send data accordingly / HandleAnalogReading(); } } } 复制代码* /* Start BLE component and register the CustomEventHandler function. This * function exposes the events from BLE component for application use / CyBle_Start(CustomEventHandler); ADC_SAR_Seq_1_Start(); ADC_SAR_Seq_1_StartConvert(); ADC_SAR_Seq_1_IsEndConversion(ADC_SAR_Seq_1_WAIT_FOR_RESULT); Pin_2_Write(0); / Start the PrISM component for LED control/ PrISM_1_Start(); PrISM_2_Start(); / The RGB LED on BLE Pioneer kit are active low. Drive HIGH on pin for OFF and drive LOW on pin for ON/ PrISM_1_WritePulse0(RGB_LED_OFF); PrISM_1_WritePulse1(RGB_LED_OFF); PrISM_2_WritePulse0(RGB_LED_OFF); 复制代码* void HandleAnalogReading(void) { uint16 ADCResult = ADC_SAR_Seq_1_GetResult16(0); uint8 AnalogData[2]; AnalogData[0] = ((ADCResult >> 8) & 0xFF); AnalogData[1] = (ADCResult & 0xFF); if(ADCResult > OPEN_FAN) Pin_2_Write(1); else Pin_2_Write(0); SendDataOverAnalogNotification(AnalogData,ANALOG_DATA_LEN); } 复制代码其中本Handler主要控制風扇開關和Analog讀值的通知透傳 7. 在main.h加入以下定義 #define OPEN_FAN 1500 void HandleAnalogReading(void); void SendDataOverAnalogNotification(uint8 AnalogData, uint16 len); 复制代码* 8. 在BLE_application增加以下程式碼 /This flag is set when the Central device writes to CCCD (Client Characteristic Configuration Descriptor) of the CapSense slider Characteristic to enable * notifications / uint8 sendCapSenseSliderNotifications = FALSE; /This flag is set when the Central device writes to CCCD (Client Characteristic * Configuration Descriptor) of the Analog Characteristic to enable * notifications / uint8 sendAnalogNotifications = FALSE; /This flag is set when the Central device writes to CCCD of the * RGB LED Characteristic to enable notifications / uint8 rgbledNotifications = FALSE; 复制代码* /* These flags are used to let application update the respective CCCD value of the * custom characteristics for correct read operation by connected Central device / uint8 updateSliderNotificationCCCDAttribute = FALSE; uint8 updateRGBNotificationCCCDAttribute = FALSE; uint8 updateAnalogNotificationCCCDAttribute = FALSE; 复制代码* case CYBLE_EVT_GATT_DISCONNECT_IND: /* This event is received when device is disconnected / / Update deviceConnected flag/ deviceConnected = FALSE; / Reset CapSense notification flag to prevent further notifications * being sent to Central device after next connection. / sendCapSenseSliderNotifications = FALSE; / Reset Analog notification flag to prevent further notifications * being sent to Central device after next connection. / sendAnalogNotifications = FALSE; Pin_2_Write(0); / Reset RGB notification flag to prevent further notifications * being sent to Central device after next connection. / rgbledNotifications = FALSE; / Reset the CCCD value to disable notifications / updateRGBNotificationCCCDAttribute = TRUE; updateAnalogNotificationCCCDAttribute = TRUE; updateSliderNotificationCCCDAttribute = TRUE; UpdateNotificationCCCD(); 复制代码* /* When this event is triggered, the peripheral has received a write command on the custom characteristic / / Check if command is for correct attribute and update the flag for sending Notifications / if(CYBLE_CAPSENSE_CAPSENSE_SLIDER_CLIENT_CHARACTERISTIC_CONFIGURATION_DESC_HANDLE == wrReqParam->handleValPair.attrHandle) { / Extract the Write value sent by the Client for CapSense Slider CCCD / sendCapSenseSliderNotifications = wrReqParam->handleValPair.value.val[CYBLE_CAPSENSE_CAPSENSE_SLIDER_CLIENT_CHARACTERISTIC_CONFIGURATION_DESC_INDEX]; / Set flag to allow CCCD to be updated for next read operation / updateSliderNotificationCCCDAttribute = TRUE; } / When this event is triggered, the peripheral has received a write command on the custom characteristic / / Check if command is for correct attribute and update the flag for sending Notifications / if(CYBLE_ANALOG_READ_ANALOG_CLIENT_CHARACTERISTIC_CONFIGURATION_DESC_HANDLE == wrReqParam->handleValPair.attrHandle) { / Extract the Write value sent by the Client for Analog CCCD / sendAnalogNotifications = wrReqParam->handleValPair.value.val[CYBLE_ANALOG_READ_ANALOG_CLIENT_CHARACTERISTIC_CONFIGURATION_DESC_INDEX]; / Set flag to allow CCCD to be updated for next read operation / updateAnalogNotificationCCCDAttribute = TRUE; } 复制代码* /******************************************************************************* * Function Name: SendDataOverAnalogNotification ******************************************************************************** * Summary: * Send Analog reading data as BLE Notifications. This function updates * the notification handle with data and triggers the BLE component to send * notification * * Parameters: * AnalogData: Analog reading value * * Return: * void * ******************************************************************************/ void SendDataOverAnalogNotification(uint8 AnalogData, uint16 len) { /* 'CapSensenotificationHandle' stores CapSense notification data parameters / CYBLE_GATTS_HANDLE_VALUE_NTF_T AnalognotificationHandle; / If stack is not busy, then send the notification / if(busyStatus == CYBLE_STACK_STATE_FREE) { / Update notification handle with CapSense slider data/ AnalognotificationHandle.attrHandle = CYBLE_ANALOG_READ_ANALOG_CHAR_HANDLE; AnalognotificationHandle.value.val = AnalogData; AnalognotificationHandle.value.len = len; / Send the updated handle as part of attribute for notifications / CyBle_GattsNotification(connectionHandle,&AnalognotificationHandle); } } 复制代码* /******************************************************************************* * Function Name: UpdateNotificationCCCD ******************************************************************************** * Summary: * Update the data handle for notification status and report it to BLE * component so that it can be read by Central device. * * Parameters: * void * * Return: * void * ******************************************************************************/ void UpdateNotificationCCCD(void) { / Local variable to store the current CCCD value / uint8 CapSenseCCCDvalue[2]; uint8 RGBCCCDvalue[2]; uint8 AnalogCCCDvalue[2]; / Handle value to update the CCCD / CYBLE_GATT_HANDLE_VALUE_PAIR_T CapSenseNotificationCCCDhandle; / Handle value to update the CCCD / CYBLE_GATT_HANDLE_VALUE_PAIR_T AnalogNotificationCCCDhandle; / Handle value to update the CCCD / CYBLE_GATT_HANDLE_VALUE_PAIR_T RGBNotificationCCCDhandle; / Update notification attribute only when there has been change in CapSense CCCD / if(updateSliderNotificationCCCDAttribute) { / Reset the flag/ updateSliderNotificationCCCDAttribute = FALSE; / Write the present CapSense notification status to the local variable / CapSenseCCCDvalue[0] = sendCapSenseSliderNotifications; CapSenseCCCDvalue[1] = 0x00; / Update CCCD handle with notification status data/ CapSenseNotificationCCCDhandle.attrHandle = CYBLE_CAPSENSE_CAPSENSE_SLIDER_CLIENT_CHARACTERISTIC_CONFIGURATION_DESC_HANDLE; CapSenseNotificationCCCDhandle.value.val = CapSenseCCCDvalue; CapSenseNotificationCCCDhandle.value.len = CCCD_DATA_LEN; / Report data to BLE component for sending data when read by Central device / CyBle_GattsWriteAttributeValue(&CapSenseNotificationCCCDhandle, ZERO, &connectionHandle, CYBLE_GATT_DB_LOCALLY_INITIATED); } / Update notification attribute only when there has been change in Analog CCCD / if(updateAnalogNotificationCCCDAttribute) { / Reset the flag/ updateAnalogNotificationCCCDAttribute = FALSE; / Write the present Analog notification status to the local variable / AnalogCCCDvalue[0] = sendAnalogNotifications; AnalogCCCDvalue[1] = 0x00; / Update CCCD handle with notification status data/ AnalogNotificationCCCDhandle.attrHandle = CYBLE_ANALOG_READ_ANALOG_CLIENT_CHARACTERISTIC_CONFIGURATION_DESC_HANDLE; AnalogNotificationCCCDhandle.value.val = AnalogCCCDvalue; AnalogNotificationCCCDhandle.value.len = CCCD_DATA_LEN; / Report data to BLE component for sending data when read by Central device / CyBle_GattsWriteAttributeValue(&AnalogNotificationCCCDhandle, ZERO, &connectionHandle, CYBLE_GATT_DB_LOCALLY_INITIATED); } / Update notification attribute only when there has been change in RGB LED CCCD/ if(updateRGBNotificationCCCDAttribute) { / Reset the flag/ updateRGBNotificationCCCDAttribute = FALSE; / Write the present RGB notification status to the local variable / RGBCCCDvalue[0] = rgbledNotifications; RGBCCCDvalue[1] = 0x00; / Update CCCD handle with notification status data/ RGBNotificationCCCDhandle.attrHandle = CYBLE_RGB_LED_RGB_LED_CONTROL_CLIENT_CHARACTERISTIC_CONFIGURATION_DESC_HANDLE; RGBNotificationCCCDhandle.value.val = RGBCCCDvalue; RGBNotificationCCCDhandle.value.len = CCCD_DATA_LEN; / Report data to BLE component for sending data when read by Central device / CyBle_GattsWriteAttributeValue(&RGBNotificationCCCDhandle, ZERO, &connectionHandle, CYBLE_GATT_DB_LOCALLY_INITIATED); } } 复制代码* 9. 修改完畢後儲存,回到TopDesign原理圖的BLE元件來新增服務 Fig. 8 新增BLE自定義服務,UUID可自己喜好來設定 Fig. 9 新增特徵值,資料型態為Array,種類為通知透傳(Notification) Fig. 10 透傳的開啟描述子 Fig. 11 服務描述子 10. 以上完成修改,按下編譯,並且燒寫至開發板上,應該是0錯誤0警告,1個通知如下 Fig. 12 編譯完成,此通知是說明受限DWR,採樣頻率會降低 11. 利用Cysmart來驗證,也可使用手機等行動裝置,電腦插入USB Dongel,在開發板上按一下SW2按鈕開始廣播,並連線,如下圖 Fig. 13 連線成功,提示動態調整組態設定,按下Yes 12. 按下Discover All Attributes,拉到最底下可看到新增的自定義服務 Fig. 14 新增的服務找尋OK 13. 將開發板接線,這裡我使用一個光敏傳感器模組,和一個繼電器模組,加上一個風扇組合成一個簡易的居家控制系統,依照讀取光敏的Analog值打開風扇,可想見情境:進入房間後打開電燈,會自動開啟風扇,離開房間時關閉電燈,風扇也會關閉 P1.6 <=> 光敏模組OUT P1.7 <=> 繼電器模組IN 3.3V <=> 光敏模組VCC 5V <=> 繼電器模組VCC GND <=> 光敏模阻GND GND <=> 繼電器模組GND 12V電源VCC <=> 繼電器模組COM 繼電器模組NO <=> 風扇VCC 12V電源GND <=> 風扇GND 复制代码 Fig. 15 實品接線圖 14. 對新建立的服務通知透傳描述子寫入1 Fig. 16 可發現特徵值開始接收到光敏模組的Analog值 15. 遮蔽光敏電阻,繼電器會關閉,放開時繼電器會觸發開啟,導通風扇 Fig. 17 風扇導通,衛生紙識別用 Fig. 18 遮蔽光敏模組,風扇關閉 16. 結束連線時,會自動關閉繼電器,注意,本設計必須建立BLE連線才能控制風扇開關,完成本篇項目設計 1
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