David Smart
Demo touching the perimeter of a circle
Revision 0:f2a6447e607c, committed 2021-04-04
- Comitter:
- WiredHome
- Date:
- Sun Apr 04 16:50:35 2021 +0000
- Child:
- 1:e4f92c21e329
- Commit message:
- New demo for touching the perimeter of a circle
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.gitignore Sun Apr 04 16:50:35 2021 +0000 @@ -0,0 +1,4 @@ +.build +.mbed +projectfiles +*.py*
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/CONTRIBUTING.md Sun Apr 04 16:50:35 2021 +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/RA8875.lib Sun Apr 04 16:50:35 2021 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/WiredHome/code/RA8875/#82f336e5c021
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/README.md Sun Apr 04 16:50:35 2021 +0000 @@ -0,0 +1,64 @@ + +# 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 Sun Apr 04 16:50:35 2021 +0000
@@ -0,0 +1,156 @@
+///
+/// RA8875 display library example where a user touch on the perimeter
+/// of a circle should be detected.
+///
+///
+/// 0 deg
+/// -+-
+/// - -
+///
+/// / \
+///
+///
+/// | |
+/// -90 deg + + + +90 deg
+/// | |
+///
+///
+/// \ /
+///
+///
+/// - -
+/// -+-
+/// +180 deg
+///
+///
+/// NOTE NOTE NOTE NOTE NOTE NOTE
+///
+/// The code in this example would greatly benefit by refactoring to
+/// use radians, rather than degrees. Further, the coordinate system
+/// desired here is more like a clock-face, with 0 degrees is straight
+/// up and increasing angle in the clockwise direction.
+///
+/// There are a few transformations (direction of rotation and angle
+/// offset) that didn't "feel right", even with the right result.
+///
+#include "mbed.h"
+#include "RA8875.h"
+
+/// Display with Capacitive Touch panel on I2C
+RA8875 lcd(p5,p6,p7,p12,NC, p9,p10,p13, "tft"); // MOSI,MISO,SCK,/ChipSelect,/reset, SDA,SCL,/IRQ, name
+//RA8875 lcd(p5,p6,p7,p8,NC, p28,p27,p30, "tft");
+
+
+Serial device(USBTX,USBRX); // Not required for display
+
+// Screen size and color depth
+#define LCD_W 800
+#define LCD_H 480
+#define LCD_C 8 // color - bits per pixel
+
+#define BL_NORM 100 // Backlight Normal setting (0 to 255)
+
+// The Circle definition around which touches are relevant
+const point_t center = {200,250};
+const dim_t radius = 125;
+const dim_t touch_tolerance = 30;
+
+#define PI 3.14159265359f
+
+// ---------------
+// radius = \ / x ^ 2 + y ^ 2
+// \/
+int GetRadius(point_t touch, point_t center)
+{
+ return sqrt(pow(touch.x - center.x, 2) + pow(touch.y - center.y, 2));
+}
+
+// (radians * 180)
+// degrees = ---------------
+// pi
+float Degrees(float radians)
+{
+ return radians * 180 / PI;
+}
+
+// (pi * degrees)
+// radians = --------------
+// 180
+float Radians(float degrees)
+{
+ return (degrees * PI)/180;
+}
+
+int GetAngle(point_t touch, point_t center)
+{
+ int angle = 180 - Degrees(atan2(touch.x - center.x, touch.y - center.y));
+ if (angle < 0)
+ angle += 360;
+ return angle;
+}
+
+// From a starting point, and at a given angle (where 0 is straight up),
+// and clockwise is increasing angle,
+// project a given distance at that angle and return those coordinates.
+//
+point_t ProjectPoint(point_t start, int angle, dim_t distance)
+{
+ point_t newPoint;
+ float radians = Radians(angle); // radians are rooted in 0 to the right, and increasing counterclockwise
+ radians = -radians + Radians(90); // reverse direction and 0 at the top
+ //device.printf("adj Radians %4.3f\r\n", radians);
+ newPoint.x = start.x + distance * sin(radians);
+ newPoint.y = start.y - distance * cos(radians);
+ return newPoint;
+}
+
+
+int main()
+{
+ device.baud(460800);
+ device.printf("\r\n RA8875 Touch Dial Example - Build " __DATE__ " " __TIME__ "\r\n");
+
+ lcd.init(LCD_W,LCD_H,LCD_C,BL_NORM);
+ lcd.TouchPanelInit();
+
+ lcd.foreground(White); // Change to white
+ lcd.printf("RA8875 Touch Dial Example - Build " __DATE__ " " __TIME__ "\r\n");
+ lcd.printf("MBED v%d.%d.%d\r\n", MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
+
+ // Draw a thick circle
+ for (int r = -3; r <= 3; r++) {
+ lcd.ellipse(center.x, center.y, radius + r, radius + r, BrightBlue);
+ }
+
+ while (1) {
+ TouchCode_t touched;
+
+ touched = lcd.TouchPanelReadable();
+ if (touched) {
+ point_t Touch = lcd.TouchCoordinates();
+
+ // If the touch is near the drawn circle (+/- 30 pixels),
+ // compute the angle to the touch from the center of the circle
+ if (abs(GetRadius(Touch, center) - radius) <= touch_tolerance) {
+ int angle = GetAngle(Touch, center);
+ device.printf("Touch at (%4d,%4d) is %3d degrees from (%4d,%4d)\r\n",
+ Touch.x, Touch.y, angle, center.x, center.y);
+
+ // Fill the circle using 6° pie slices up to the angle of the touch
+ point_t lastP = ProjectPoint(center, 90, radius); // seed it at angle 0
+ for (int a=6; a<=360; a+=6) {
+ point_t p = ProjectPoint(center, 90 - a, radius);
+ color_t fillColor = (a <= angle) ? Blue : Black;
+ if ((a <= angle)) { // show the triangle coordinates (only the fill)
+ device.printf(" (%3d,%3d), (%3d,%3d), (%3d,%3d)\r\n",
+ lastP.x,lastP.y, p.x,p.y, center.x,center.y);
+ }
+ lcd.filltriangle(center, p, lastP, fillColor);
+ lastP = p;
+ }
+ // Show the touch point (note we're not erasing the old one)
+ lcd.fillellipse(Touch.x, Touch.y, 5, 5, BrightRed);
+ }
+ }
+ }
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-os.lib Sun Apr 04 16:50:35 2021 +0000 @@ -0,0 +1,1 @@ +https://github.com/ARMmbed/mbed-os/#cf4f12a123c05fcae83fc56d76442015cb8a39e9
Binary file resources/official_armmbed_example_badge.png has changed