Silicon Labs / Mbed 2 deprecated Serial-LowPower-Demo Featured

A code sample showing the use of the asynchronous Serial APIs.

Dependencies:   mbed

Beware: this example is only compatible with boards supporting the asynchronous APIs!

Information

All examples in this repo are considered EXPERIMENTAL QUALITY, meaning this code has been created as one-off proof-of-concept and is suitable as a demonstration for experimental purposes only. This code will not be regularly maintained by Silicon Labs and there is no guarantee that these projects will work across all environments, SDK versions and hardware.

main.cpp@1:f6715f1bf6a6, 2015-05-13 (annotated)

Committer:
stevew817
Date:
Wed May 13 09:01:35 2015 +0000
Revision:
1:f6715f1bf6a6
switch to prebuilt mbed;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
stevew817 1:f6715f1bf6a6 1 #include "mbed.h"
stevew817 1:f6715f1bf6a6 2
stevew817 1:f6715f1bf6a6 3 /*------------ Constant definitions --------------*/
stevew817 1:f6715f1bf6a6 4 #define TX_PIN USBTX
stevew817 1:f6715f1bf6a6 5 #define RX_PIN USBRX
stevew817 1:f6715f1bf6a6 6 #define BRATE 115200
stevew817 1:f6715f1bf6a6 7 #define LED_PIN LED0
stevew817 1:f6715f1bf6a6 8 #define TOGGLE_RATE (0.5f)
stevew817 1:f6715f1bf6a6 9 #define BUFF_LENGTH 5
stevew817 1:f6715f1bf6a6 10
stevew817 1:f6715f1bf6a6 11 /*-------- Check if platform compatible ----------*/
stevew817 1:f6715f1bf6a6 12 #if DEVICE_SERIAL_ASYNCH
stevew817 1:f6715f1bf6a6 13 Serial test_connection(USBTX, USBRX);
stevew817 1:f6715f1bf6a6 14 #else
stevew817 1:f6715f1bf6a6 15 #error "Platform not compatible with Low Power APIs for Serial"
stevew817 1:f6715f1bf6a6 16 #endif
stevew817 1:f6715f1bf6a6 17
stevew817 1:f6715f1bf6a6 18 /*------------------ Variables -------------------*/
stevew817 1:f6715f1bf6a6 19 LowPowerTicker blinker;
stevew817 1:f6715f1bf6a6 20 bool blinking = false;
stevew817 1:f6715f1bf6a6 21 event_callback_t serialEventCb;
stevew817 1:f6715f1bf6a6 22 DigitalOut LED;
stevew817 1:f6715f1bf6a6 23 char rx_buf[BUFF_LENGTH + 1];
stevew817 1:f6715f1bf6a6 24
stevew817 1:f6715f1bf6a6 25 /*------------------ Callbacks -------------------*/
stevew817 1:f6715f1bf6a6 26 void blink(void) {
stevew817 1:f6715f1bf6a6 27 LED = ~LED;
stevew817 1:f6715f1bf6a6 28 }
stevew817 1:f6715f1bf6a6 29
stevew817 1:f6715f1bf6a6 30 void serialCb(int events) {
stevew817 1:f6715f1bf6a6 31 /* Something triggered the callback, either buffer is full or 'S' is received */
stevew817 1:f6715f1bf6a6 32 unsigned char i = 0;
stevew817 1:f6715f1bf6a6 33 if(events & SERIAL_EVENT_RX_CHARACTER_MATCH) {
stevew817 1:f6715f1bf6a6 34 //Received 'S', check for buffer length
stevew817 1:f6715f1bf6a6 35 for(unsigned char i; i < BUFF_LENGTH; i++) {
stevew817 1:f6715f1bf6a6 36 //Found the length!
stevew817 1:f6715f1bf6a6 37 if(rx_buf[i] == 'S') break;
stevew817 1:f6715f1bf6a6 38 }
stevew817 1:f6715f1bf6a6 39
stevew817 1:f6715f1bf6a6 40 // Toggle blinking
stevew817 1:f6715f1bf6a6 41 if(blinking) {
stevew817 1:f6715f1bf6a6 42 blinker.detach();
stevew817 1:f6715f1bf6a6 43 blinking = false;
stevew817 1:f6715f1bf6a6 44 } else {
stevew817 1:f6715f1bf6a6 45 blinker.attach(blink, TOGGLE_RATE);
stevew817 1:f6715f1bf6a6 46 blinking = true;
stevew817 1:f6715f1bf6a6 47 }
stevew817 1:f6715f1bf6a6 48 } else if (events & SERIAL_EVENT_RX_COMPLETE) {
stevew817 1:f6715f1bf6a6 49 i = BUFF_LENGTH - 1;
stevew817 1:f6715f1bf6a6 50 } else {
stevew817 1:f6715f1bf6a6 51 rx_buf[0] = 'E';
stevew817 1:f6715f1bf6a6 52 rx_buf[1] = 'R';
stevew817 1:f6715f1bf6a6 53 rx_buf[2] = 'R';
stevew817 1:f6715f1bf6a6 54 rx_buf[3] = '!';
stevew817 1:f6715f1bf6a6 55 rx_buf[4] = 0;
stevew817 1:f6715f1bf6a6 56 i = 3;
stevew817 1:f6715f1bf6a6 57 }
stevew817 1:f6715f1bf6a6 58
stevew817 1:f6715f1bf6a6 59 // Echo string, no callback
stevew817 1:f6715f1bf6a6 60 test_connection.write(rx_buf, i+1, (event_callback_t*)0, 0);
stevew817 1:f6715f1bf6a6 61
stevew817 1:f6715f1bf6a6 62 // Reset serial reception
stevew817 1:f6715f1bf6a6 63 test_connection.read(rx_buf, BUFF_LENGTH, &serialEventCb, SERIAL_EVENT_RX_ALL, 'S');
stevew817 1:f6715f1bf6a6 64 }
stevew817 1:f6715f1bf6a6 65
stevew817 1:f6715f1bf6a6 66 /*-------------------- Main ----------------------*/
stevew817 1:f6715f1bf6a6 67 int main() {
stevew817 1:f6715f1bf6a6 68 /* Very Simple Main (tm) */
stevew817 1:f6715f1bf6a6 69 serialEventCb.attach(serialCb);
stevew817 1:f6715f1bf6a6 70
stevew817 1:f6715f1bf6a6 71 /* Setup serial connection */
stevew817 1:f6715f1bf6a6 72 test_connection.baud(BRATE);
stevew817 1:f6715f1bf6a6 73 test_connection.printf("Low Power API test\n\nSend 'S' to toggle blinking\n");
stevew817 1:f6715f1bf6a6 74 test_connection.read(rx_buf, BUFF_LENGTH, &serialEventCb, SERIAL_EVENT_RX_ALL, 'S');
stevew817 1:f6715f1bf6a6 75
stevew817 1:f6715f1bf6a6 76 /* Let the callbacks take care of everything */
stevew817 1:f6715f1bf6a6 77 while(1) sleep();
stevew817 1:f6715f1bf6a6 78 }