Revision 0:08dd14677b02, committed 2019-11-20

Comitter:

castlefei

Date:

Wed Nov 20 11:56:33 2019 +0000

Commit message:

peak detection by wenchang Fei

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.gitignore	Wed Nov 20 11:56:33 2019 +0000
@@ -0,0 +1,4 @@
+.build
+.mbed
+projectfiles
+*.py*

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CONTRIBUTING.md	Wed Nov 20 11:56:33 2019 +0000
@@ -0,0 +1,5 @@
+# Contributing to Mbed OS
+
+Mbed OS is an open-source, device software platform for the Internet of Things. Contributions are an important part of the platform, and our goal is to make it as simple as possible to become a contributor.
+
+To encourage productive collaboration, as well as robust, consistent and maintainable code, we have a set of guidelines for [contributing to Mbed OS](https://os.mbed.com/docs/mbed-os/latest/contributing/index.html).

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/README.md	Wed Nov 20 11:56:33 2019 +0000
@@ -0,0 +1,64 @@
+![](./resources/official_armmbed_example_badge.png)
+# Blinky Mbed OS example
+
+The example project is part of the [Arm Mbed OS Official Examples](https://os.mbed.com/code/) and is the [getting started example for Mbed OS](https://os.mbed.com/docs/mbed-os/v5.14/quick-start/index.html). It contains an application that repeatedly blinks an LED on supported [Mbed boards](https://os.mbed.com/platforms/).
+
+You can build the project with all supported [Mbed OS build tools](https://os.mbed.com/docs/mbed-os/latest/tools/index.html). However, this example project specifically refers to the command-line interface tool [Arm Mbed CLI](https://github.com/ARMmbed/mbed-cli#installing-mbed-cli).
+(Note: To see a rendered example you can import into the Arm Online Compiler, please see our [import quick start](https://os.mbed.com/docs/mbed-os/latest/quick-start/online-with-the-online-compiler.html#importing-the-code).)
+
+1. [Install Mbed CLI](https://os.mbed.com/docs/mbed-os/latest/quick-start/offline-with-mbed-cli.html).
+
+1. Clone this repository on your system, and change the current directory to where the project was cloned:
+
+    ```bash
+    $ git clone git@github.com:armmbed/mbed-os-example-blinky && cd mbed-os-example-blinky
+    ```
+
+    Alternatively, you can download the example project with Arm Mbed CLI using the `import` subcommand:
+
+    ```bash
+    $ mbed import mbed-os-example-blinky && cd mbed-os-example-blinky
+    ```
+
+
+## Application functionality
+
+The `main()` function is the single thread in the application. It toggles the state of a digital output connected to an LED on the board.
+
+## Building and running
+
+1. Connect a USB cable between the USB port on the board and the host computer.
+2. <a name="build_cmd"></a> Run the following command to build the example project and program the microcontroller flash memory:
+    ```bash
+    $ mbed compile -m <TARGET> -t <TOOLCHAIN> --flash
+    ```
+The binary is located at `./BUILD/<TARGET>/<TOOLCHAIN>/mbed-os-example-blinky.bin`.
+
+Alternatively, you can manually copy the binary to the board, which you mount on the host computer over USB.
+
+Depending on the target, you can build the example project with the `GCC_ARM`, `ARM` or `IAR` toolchain. After installing Arm Mbed CLI, run the command below to determine which toolchain supports your target:
+
+```bash
+$ mbed compile -S
+```
+
+## Expected output
+The LED on your target turns on and off every 500 milliseconds.
+
+
+## Troubleshooting
+If you have problems, you can review the [documentation](https://os.mbed.com/docs/latest/tutorials/debugging.html) for suggestions on what could be wrong and how to fix it.
+
+## Related Links
+
+* [Mbed OS Stats API](https://os.mbed.com/docs/latest/apis/mbed-statistics.html).
+* [Mbed OS Configuration](https://os.mbed.com/docs/latest/reference/configuration.html).
+* [Mbed OS Serial Communication](https://os.mbed.com/docs/latest/tutorials/serial-communication.html).
+* [Mbed OS bare metal](https://os.mbed.com/docs/mbed-os/latest/reference/mbed-os-bare-metal.html).
+* [Mbed boards](https://os.mbed.com/platforms/).
+
+### License and contributions
+
+The software is provided under Apache-2.0 license. Contributions to this project are accepted under the same license. Please see contributing.md for more info.
+
+This project contains code from other projects. The original license text is included in those source files. They must comply with our license guide.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Nov 20 11:56:33 2019 +0000
@@ -0,0 +1,101 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2019 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "mbed.h"
+#include "platform/mbed_thread.h"
+#include <vector>  
+#include <iostream>
+
+// Blinking rate in milliseconds
+#define BLINKING_RATE_MS                                                    500
+using namespace std;
+
+void findPeaks(float *num,int count, float threshold)  
+{  
+    vector<int> sign;  
+    for(int i = 1;i<count;i++)  
+    {  
+        /*do difference between the near points： 
+         *result<0，sign = -1 
+         *result>0，sign = 1 
+         *result=0，sign = 0 
+         */  
+        int diff = num[i] - num[i-1];  
+        if(diff>0)  
+        {  
+            sign.push_back(1);  
+        }  
+        else if(diff<0)  
+        {  
+            sign.push_back(-1);  
+        }  
+        else  
+        {  
+            sign.push_back(0);  
+        }  
+    }  
+    //do difference between the near sign
+    //result < 0 save the max index
+    //result > 0 save the min index 
+    vector<int> indMax;  
+    vector<int> indMin;  
+    int cnt = 1;
+    for(int j = 1;j<sign.size();j++)  
+    {  
+        int diff = sign[j]-sign[j-1];  
+        if(diff<0)  
+        {  
+            indMax.push_back(j);  
+        }  
+        else if(diff>0)  
+        {  
+            indMin.push_back(j);  
+        }  
+    }  
+    //try to find the valid max (which the previous min is smaller than threshold)
+    //begin with index 1 so there will have +1 or -1 error
+    for(int j = 1;j<indMax.size();j++)  
+    {
+        
+        for(int i =0; i <indMin.size()-1; i++)
+        {
+            if(indMin[i]<indMax[j] && indMin[i+1]>indMax[j] && num[indMin[i]]< threshold)
+            {
+                cnt = cnt +1;    
+                printf("found a valid max, index:%d, value: %f \n\r", indMax[j],num[indMax[j]]);
+            }    
+        }
+        
+    }
+    printf("num of max: %d\n\r", indMax.size());
+    printf("num of valid max: %d\n\r", cnt);
+    
+    cout<<"max values:"<<endl;
+    for(int m = 0;m<indMax.size();m++)  
+    {  
+        cout<<num[indMax[m]]<<"  ";  
+    }  
+    cout<<endl;  
+    cout<<"min values："<<endl;  
+    for(int n = 0;n<indMin.size();n++)  
+    {  
+        cout<<num[indMin[n]]<<"  ";  
+    }  
+    cout<<endl;
+}  
+
+int main()
+{
+    // Initialise the digital pin LED1 as an output
+    DigitalOut led(LED1);
+    float a[] = {1,2,10,2,4,0,8,10,23,0,2, 0, 5};  
+    int len = sizeof(a)/sizeof(int);
+    while (true) {
+        //printf("len of a is %d \n\r", len);
+        findPeaks(a,len,1); 
+        led = !led;
+        thread_sleep_for(BLINKING_RATE_MS);
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Wed Nov 20 11:56:33 2019 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#679d24833acf0a0b5b0d528576bb37c70863bc4e

Binary file resources/official_armmbed_example_badge.png has changed