main.cpp

00001 #include "mbed.h"
00002 #include "TextLCD.h"
00003 
00004 # define TEMPERATURE_TIMEOUT 10*60+5 //s
00005 
00006 // https://github.com/andresv/OOThermometer
00007 // mbed shows data from serial on LCD screen
00008 
00009 TextLCD lcd(p26, p25, p24, p23, p22, p21, TextLCD::LCD16x2B); // rs, e, d4-d7
00010 DigitalOut led1(LED1);
00011 
00012 Serial pc(USBTX, USBRX);
00013 Serial base(p9, p10);
00014 Timeout syncronizator;
00015 Timeout timeouter;
00016 
00017 Timer in_timer;
00018 Timer out_timer;
00019 
00020 enum {
00021     SERIAL_ADDR_NODE        = 0x01,
00022     SERIAL_ADDR_BASE        = 0x00,
00023     
00024     MSG_THERMOMETER         = 0x01,
00025     MSG_REQ_THERMOMETER     = 0x10
00026 };
00027 
00028 typedef struct {
00029     unsigned short battery;
00030     int light;
00031     int temp;
00032     char addr;
00033     char header;
00034 } __attribute__((packed)) thermometer_msg_t;
00035 
00036 typedef struct {
00037     char header;
00038 } __attribute__((packed)) req_thermometer_msg_t;
00039 
00040 char rx_buffer[50];
00041 char* inserter = rx_buffer + sizeof(rx_buffer);
00042 unsigned int bytes_received = 0;
00043 
00044 float in_temp = 0.0;
00045 float out_temp = 0.0;
00046 
00047 void packet_received();
00048 void check_timeout();
00049 void update_out_temp();
00050 void update_in_temp();
00051 void request_temp();
00052 
00053 //----------------------------------------------------------------------------
00054 // Byte received from UART
00055 //----------------------------------------------------------------------------
00056 void receive() {
00057     led1 = !led1;
00058     if (base.readable()) {
00059         // if we have not got any data for 50 ms display data
00060         // because it was probably packet end
00061         // here it is like watchdog kick:
00062         syncronizator.attach(&packet_received, 0.05);
00063         
00064         *inserter = base.getc();
00065         inserter--;
00066         bytes_received++;
00067 
00068         if (inserter == rx_buffer)
00069             inserter = rx_buffer + sizeof(rx_buffer);
00070     }
00071 }
00072 
00073 //----------------------------------------------------------------------------
00074 // Probabaly packet received from UART
00075 //----------------------------------------------------------------------------
00076 void packet_received() {
00077     thermometer_msg_t* msg = (thermometer_msg_t*)(inserter+1);
00078     unsigned int i = 0;
00079 
00080     for (i=0; i<bytes_received; i++)
00081         pc.printf("%02X\n", ((char*)msg)[i]);
00082     pc.printf("\n");
00083     
00084     if (msg->header == MSG_THERMOMETER && bytes_received == sizeof(thermometer_msg_t)) {
00085         if (msg->addr == SERIAL_ADDR_BASE) {
00086             in_temp = ((float)msg->temp)/10;
00087             in_timer.reset();
00088             update_in_temp();
00089         }
00090         else if (msg->addr == SERIAL_ADDR_NODE) {
00091             out_temp = ((float)msg->temp)/10;
00092             out_timer.reset();
00093             update_out_temp();
00094         }
00095     }
00096     
00097     bytes_received = 0;
00098     inserter = rx_buffer + sizeof(rx_buffer);
00099 }
00100 
00101 //----------------------------------------------------------------------------
00102 // Check whether there is timeout condition
00103 //----------------------------------------------------------------------------
00104 void check_timeout() {
00105     pc.printf("timeout!\n");
00106     timeouter.attach(&check_timeout, TEMPERATURE_TIMEOUT+1);
00107     update_in_temp();
00108     update_out_temp();
00109 }
00110 
00111 void update_in_temp() {
00112     lcd.locate(2, 1);
00113     pc.printf("in timer %.1f\n", in_timer.read());
00114     if (in_timer.read() < TEMPERATURE_TIMEOUT) {
00115         lcd.printf("%.1f\n", in_temp);
00116     }
00117     else {
00118         lcd.printf("XX.X\n");
00119     }
00120 }
00121 
00122 void update_out_temp() {
00123     lcd.locate(10, 1);
00124     pc.printf("out timer %.1f\n", out_timer.read());
00125     if (out_timer.read() < TEMPERATURE_TIMEOUT) {
00126         lcd.printf("%.1f\n", out_temp);
00127     }
00128     else {
00129         lcd.printf("XX.X\n");
00130     }
00131 }
00132 
00133 //----------------------------------------------------------------------------
00134 // Request temperature from base and node
00135 //----------------------------------------------------------------------------
00136 void request_temp() {
00137     req_thermometer_msg_t msg;
00138     unsigned int i;
00139     
00140     msg.header = MSG_REQ_THERMOMETER;
00141     
00142     for (i=0; i<sizeof(req_thermometer_msg_t); i++)
00143         base.putc(((char*)&msg)[i]);
00144 }
00145 
00146 //----------------------------------------------------------------------------
00147 // Main
00148 //----------------------------------------------------------------------------
00149 int main() {
00150     base.baud(115200);
00151     pc.baud(115200);
00152     
00153     base.attach(&receive, Serial::RxIrq);
00154     lcd.printf("   IN     OUT\n");
00155     
00156     in_timer.start();
00157     out_timer.start();
00158     timeouter.attach(&check_timeout, TEMPERATURE_TIMEOUT+1);
00159     
00160     request_temp();
00161     while(1) {
00162     }
00163 }