Stage-1 Students SoCEM
/
ELEC350_Task330_Polling
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Revision 0:24610a6f4e59, committed 2017-10-24
- Comitter:
- martinsimpson
- Date:
- Tue Oct 24 14:01:04 2017 +0000
- Commit message:
- edited from N.Outram code lecture 23 Oct 2017
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.gitignore Tue Oct 24 14:01:04 2017 +0000 @@ -0,0 +1,4 @@ +.build +.mbed +projectfiles +*.py*
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/README.md Tue Oct 24 14:01:04 2017 +0000 @@ -0,0 +1,87 @@ +# Getting started with Blinky on mbed OS + +This guide reviews the steps required to get Blinky working on an mbed OS platform. + +Please install [mbed CLI](https://github.com/ARMmbed/mbed-cli#installing-mbed-cli). + +## Import the example application + +From the command-line, import the example: + +``` +mbed import mbed-os-example-blinky +cd mbed-os-example-blinky +``` + +### Now compile + +Invoke `mbed compile`, and specify the name of your platform and your favorite toolchain (`GCC_ARM`, `ARM`, `IAR`). For example, for the ARM Compiler 5: + +``` +mbed compile -m K64F -t ARM +``` + +Your PC may take a few minutes to compile your code. At the end, you see the following result: + +``` +[snip] ++----------------------------+-------+-------+------+ +| Module | .text | .data | .bss | ++----------------------------+-------+-------+------+ +| Misc | 13939 | 24 | 1372 | +| core/hal | 16993 | 96 | 296 | +| core/rtos | 7384 | 92 | 4204 | +| features/FEATURE_IPV4 | 80 | 0 | 176 | +| frameworks/greentea-client | 1830 | 60 | 44 | +| frameworks/utest | 2392 | 512 | 292 | +| Subtotals | 42618 | 784 | 6384 | ++----------------------------+-------+-------+------+ +Allocated Heap: unknown +Allocated Stack: unknown +Total Static RAM memory (data + bss): 7168 bytes +Total RAM memory (data + bss + heap + stack): 7168 bytes +Total Flash memory (text + data + misc): 43402 bytes +Image: .\.build\K64F\ARM\mbed-os-example-blinky.bin +``` + +### Program your board + +1. Connect your mbed device to the computer over USB. +1. Copy the binary file to the mbed device. +1. Press the reset button to start the program. + +The LED on your platform turns on and off. + +## Export the project to Keil MDK, and debug your application + +From the command-line, run the following command: + +``` +mbed export -m K64F -i uvision +``` + +To debug the application: + +1. Start uVision. +1. Import the uVision project generated earlier. +1. Compile your application, and generate an `.axf` file. +1. Make sure uVision is configured to debug over CMSIS-DAP (From the Project menu > Options for Target '...' > Debug tab > Use CMSIS-DAP Debugger). +1. Set breakpoints, and start a debug session. + + + +## Troubleshooting + +1. Make sure `mbed-cli` is working correctly and its version is `>1.0.0` + + ``` + mbed --version + ``` + + If not, you can update it: + + ``` + pip install mbed-cli --upgrade + ``` + +2. If using Keil MDK, make sure you have a license installed. [MDK-Lite](http://www.keil.com/arm/mdk.asp) has a 32 KB restriction on code size. \ No newline at end of file
Binary file img/uvision.png has changed
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Oct 24 14:01:04 2017 +0000
@@ -0,0 +1,29 @@
+#include "mbed.h"
+#include "swpol.hpp"
+
+DigitalOut led1(LED1);
+
+DigitalOut red_led(PE_15);
+DigitalOut yellow_led(PB_10);
+DigitalOut green_led(PB_11);
+DigitalIn sw1(PE_12);
+DigitalIn sw2(PE_14);
+
+SWPoll switch1(sw1, red_led);
+SWPoll switch2(sw2, green_led);
+
+Timer t;
+
+// main() runs in its own thread in the OS
+int main() {
+ t.start();
+ while(1) {
+ if (t.read_ms() >= 500) {
+ yellow_led = !yellow_led;
+ t.reset();
+ }
+ switch1.poll();
+ switch2.poll();
+ };
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-os.lib Tue Oct 24 14:01:04 2017 +0000 @@ -0,0 +1,1 @@ +https://github.com/ARMmbed/mbed-os/#6e0d01cd13e8aca7bf4d697c3699ec9225386881
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/swpol.hpp Tue Oct 24 14:01:04 2017 +0000
@@ -0,0 +1,70 @@
+#include "mbed.h"
+
+class SWPoll {
+ private:
+ enum State {LOW, LOW_DEBOUNCE, HIGH,HIGH_DEBOUNCE};
+ State state;
+ DigitalIn& sw;
+ DigitalOut& led;
+ Timer t;
+
+ public:
+ //Constructor
+ SWPoll(DigitalIn& gpioIn,DigitalOut& gpioOut) : sw(gpioIn),led(gpioOut)
+ {
+ state = LOW;
+ t.reset();
+ led = 0;
+ }
+ //Deconstructor
+ ~SWPoll(){
+ //Shut Down
+ t.stop();
+ t.reset();
+ led = 0;
+ }
+ // API - poll the switches
+ // Use of a Timer to manage switch bounce
+ void poll(){
+ switch (state)
+ {
+ // waiting for switch to rise
+ case LOW:
+ if (sw == 1){
+ state = LOW_DEBOUNCE;
+ t.reset();
+ t.start();
+ }
+ break;
+ case LOW_DEBOUNCE:
+ if (t.read_ms() >= 200){
+ state = HIGH;
+ t.stop();
+ t.reset();
+ }
+ break;
+ case HIGH:
+ if (sw == 0) {
+ led = !led;
+ state = HIGH_DEBOUNCE;
+ t.reset();
+ t.start();
+ }
+ break;
+ case HIGH_DEBOUNCE:
+ if (t.read_ms() >= 200) {
+ state = LOW;
+ t.stop();
+ t.reset();
+ }
+ break;
+ default:
+ t.stop();
+ t.reset();
+ state = LOW;
+ break;
+ } //end switch
+ //This is a Mealy Machine - so no output logic follows
+
+ }
+};