Example for using the MAX1472 RF Transmitter for low power data transmission.
Dependencies: mbed-dev2 max32630fthr USBDevice
main.cpp
- Committer:
- tlyp
- Date:
- 2020-09-04
- Revision:
- 2:33b3b46a9c0d
- Parent:
- 1:8834bc22c2e7
- Child:
- 3:b0579a51fd46
File content as of revision 2:33b3b46a9c0d:
/******************************************************************************* * Copyright (C) Maxim Integrated Products, Inc., All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of Maxim Integrated * Products, Inc. shall not be used except as stated in the Maxim Integrated * Products, Inc. Branding Policy. * * The mere transfer of this software does not imply any licenses * of trade secrets, proprietary technology, copyrights, patents, * trademarks, maskwork rights, or any other form of intellectual * property whatsoever. Maxim Integrated Products, Inc. retains all * ownership rights. ******************************************************************************* This is code for the MAX1472 RF Transmitter EV-Kit. This program will record a temperature fom the MAX30208 EV-Kit, encrypt the data using the user-generated Symmetric key, apply forward error correction (FEC) encoding, and then send the message via the MAX1472 transmitter. When the MAX1472 is not sending data, it will go into a power saving sleep mode. Hardware Setup and connections: MAX32630FTHR-> MAX1472 Ev-Kit 3.3V -> VDD GND -> VSS P3_1 -> Data_In P5_1 -> ENABLE ******************************************************************************* MAX32630FTHR-> MAX30208 Ev-Kit 1.8V -> VIN GND -> GND P3_4 -> SDA P3_5 -> SCL ******************************************************************************* */ #include "mbed.h" #include "max32630fthr.h" #include "mxc_config.h" #include "lp.h" #include "gpio.h" #include "rtc.h" #include "MAX14690.h" #include "USBSerial.h" #include "MAX30208.h" #include "ForwardErrCorr.h" MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3); I2C i2c(P3_4, P3_5); //sda,scl RawSerial uart(P3_1,P3_0);//tx,rx MAX30208 TempSensor(i2c, 0x50); //Constructor takes 7-bit slave adrs #define SymmetricKey "RfIsCoOl" //Set Private Key here -- Make sure it is identical to receiver char TransTable[] = {0x1F,0x18,0x06,0x01}; //Used to translate data for FEC -- Make sure it is identical to receiver Translator transTx(SymmetricKey, TransTable); //Initialize Encoder #define SendDelay 5 //Number of seconds between sending data char DEVICETYPE = 'T'; //'T' for Temperature Sensor char DEVICEID = 0x01; //Set the Device ID USBSerial microUSB; //microUSB connection that can be used for printing DigitalOut rLED(LED1); DigitalOut gLED(LED2); DigitalOut bLED(LED3); DigitalIn sw1(SW1); //Used on start-up to stay in active mode for re-programming DigitalOut TXEnable(P5_1); //Used to Enable Transmitter // ***************************************************************************** /* * @brief Configures the RTC to tick every second so it can be compared to during sleep intterupt */ void RTC_Setup() { rtc_cfg_t RTCconfig; RTCconfig.prescaler = RTC_PRESCALE_DIV_2_12; //Set tick frequency to 1 second RTCconfig.prescalerMask = RTC_PRESCALE_DIV_2_12; //1 second frequency RTCconfig.snoozeCount = 0; RTCconfig.snoozeMode = RTC_SNOOZE_DISABLE; RTC_Init(&RTCconfig); RTC_Start(); } //**************************************************************************** /** * @brief Record and read temperature from MAX30208 * @param TempSensor - Refrence to MAX30208 temp sensor object * @param &value[OUT]- Address to store read temperature at * @return 0 on success, 1 on failure due to improper data record or read */ uint16_t ReadData(MAX30208 TempSensor, uint16_t &value){ if (TempSensor.takeDataMeasurment() != 0){ microUSB.printf("Error Taking data Meaurment\r\n"); return(1); } wait_ms(50); //max temp read is 50ms if (TempSensor.readData(value) !=0){ microUSB.printf("Error reading temperature Data\r\n"); return(1); } return(0); } //***************************************************************************** /* * @brief Begin Communication with warm up bytes and device type/id */ void comInit(){ uart.putc(0xFF); uart.putc(0xFF); uart.putc(0x00); uart.putc('b'); uart.putc(DEVICETYPE); uart.putc(DEVICEID); } //***************************************************************************** /** * @brief Send data and end transmission * @param EncryptedData[IN] - 8 bytes of encryted data to send via UART connection */ void comData(char *EncryptedData){ for(int i=0;i<8;i++){ uart.putc(EncryptedData[i]); //Send all of the encrypted data } uart.putc('c'); //End of packet character uart.send_break(); } //***************************************************************************** int main(void) { //initialize PMIC MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3); uart.baud(9600); //Set baud rate for 9600 //check if starting at main because of LP0 wake-up if(LP_IsLP0WakeUp()) { //empty } else { //We did not wake up from sleep and this is first power-on //Only configure RTC the first time around RTC_Setup(); } //Set LEDs on to show device is awake gLED = LED_ON; rLED = LED_ON; bLED = LED_ON; //Main loop while(1) { //hold down switch 1 to prevent the microcontroller from going into LP0 while(sw1 == 0); uint16_t tempData; if(ReadData(TempSensor,tempData) !=0){ printf("Error reading data!\r\n"); } //Encrypt Temperature Data char EncryptedData[8]; transTx.Encrypt(tempData,EncryptedData); TXEnable = 1; //Turn on Transmitter wait_us(450); //Wake-up time for transmitter //Start a timer for sending data Timer timer; timer.start(); //Send the data for 1 sec while(timer.read_ms() < 1000) { //Send Data continuously comInit(); comData(EncryptedData); }//while TXEnable = 0; //Turn off Transmitter timer.stop(); //Stop send timer //Clear existing wake-up config LP_ClearWakeUpConfig(); //Clear any event flags LP_ClearWakeUpFlags(); //configure wake-up on RTC compare 0 //LP_ConfigRTCWakeUp(enable compare0, enable compare1, set prescale, set rollover) LP_ConfigRTCWakeUp(1, 0, 0, 0); //disable unused PMIC rails to minimize power consumption pegasus.max14690.ldo2SetMode(MAX14690::LDO_DISABLED); pegasus.max14690.ldo3SetMode(MAX14690::LDO_DISABLED); //Turn off LEDs to show low power mode gLED = LED_OFF; rLED = LED_OFF; bLED = LED_OFF; //Reset the RTC back to 0 ticks RTC_SetCount(0); //set RTC to generate an interrupt every SendDelay seconds (User defined value at top of program) RTC_SetCompare(0,SendDelay); //(Compare index, Compare Value in ticks) //clear comparison flag in the RTC registers RTC_ClearFlags(MXC_F_RTC_FLAGS_COMP0); //Enter Deep Sleep Mode LP_EnterLP0(); //firmware will reset with no prior knowledge on wake-up } }