Test software for SatChat prototype hardware Platform - MAX32630FTHR
Dependencies: USBDevice max32630fthr
main.cpp@12:a895e3581542, 2017-07-02 (annotated)
- Committer:
- koziniec
- Date:
- Sun Jul 02 13:37:27 2017 +0000
- Revision:
- 12:a895e3581542
- Parent:
- 11:a9c16968e7f6
- Child:
- 13:ff0b39177386
Yay! Epoch sets from GPS :-); GPS routine largely done. Blocks until a fix is obtained and then returns after setting values in global variables.; ; Need to tidy up (remove) printf.; Add some meaningful LED feedback instead;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
koziniec | 0:59c04ca89ae2 | 1 | |
koziniec | 0:59c04ca89ae2 | 2 | #include "mbed.h" |
koziniec | 0:59c04ca89ae2 | 3 | #include "max32630fthr.h" |
koziniec | 1:b8cb82927f33 | 4 | #include <stdbool.h> |
koziniec | 1:b8cb82927f33 | 5 | #define on 1 |
koziniec | 1:b8cb82927f33 | 6 | #define off 0 |
koziniec | 1:b8cb82927f33 | 7 | |
koziniec | 0:59c04ca89ae2 | 8 | Serial pc(USBTX, USBRX); |
koziniec | 1:b8cb82927f33 | 9 | Serial gps(P5_3, P5_4, 9600); |
koziniec | 0:59c04ca89ae2 | 10 | I2C i2c(P5_7,P6_0); // SDA, SCL |
koziniec | 0:59c04ca89ae2 | 11 | |
koziniec | 1:b8cb82927f33 | 12 | DigitalOut red_led(LED1,1); |
koziniec | 1:b8cb82927f33 | 13 | DigitalOut green_led(LED2,1); |
koziniec | 1:b8cb82927f33 | 14 | DigitalOut blue_led(LED3,1); |
koziniec | 1:b8cb82927f33 | 15 | |
koziniec | 9:b8a60ade343e | 16 | char gpsfix_last_utc_time[11] = {0}; |
koziniec | 9:b8a60ade343e | 17 | char gpsfix_last_utc_date[7] = {0}; |
koziniec | 9:b8a60ade343e | 18 | char gpsfix_longtitude[12] = {0}; |
koziniec | 9:b8a60ade343e | 19 | char gpsfix_latitude[12] = {0}; |
koziniec | 9:b8a60ade343e | 20 | char gpsfix_speed[8] = {0}; //Set but not used |
koziniec | 9:b8a60ade343e | 21 | char gpsfix_course[7] = {0}; //Set but not used |
koziniec | 9:b8a60ade343e | 22 | char gpsfix_variation[7] = {0}; //Set but not used |
koziniec | 9:b8a60ade343e | 23 | char gpsfix_mag_var_ew[1] = {0};//Set but not used |
koziniec | 11:a9c16968e7f6 | 24 | char gpsfix_ns = 0; |
koziniec | 11:a9c16968e7f6 | 25 | char gpsfix_ew = 0; |
koziniec | 9:b8a60ade343e | 26 | |
koziniec | 9:b8a60ade343e | 27 | |
koziniec | 1:b8cb82927f33 | 28 | void gps_power(bool state) |
koziniec | 1:b8cb82927f33 | 29 | { |
koziniec | 1:b8cb82927f33 | 30 | char data[2]; |
koziniec | 1:b8cb82927f33 | 31 | data[0] = 0x16; //MAX14690 LDO3cfg register |
koziniec | 1:b8cb82927f33 | 32 | data[1] = 0xE0; //Disable LDO3 |
koziniec | 1:b8cb82927f33 | 33 | if (state == on) { |
koziniec | 1:b8cb82927f33 | 34 | data[1] = 0xE2; //Enable LDO3 |
koziniec | 1:b8cb82927f33 | 35 | } |
koziniec | 9:b8a60ade343e | 36 | i2c.write( 0x50, data, 2 ); |
koziniec | 1:b8cb82927f33 | 37 | } |
koziniec | 1:b8cb82927f33 | 38 | |
koziniec | 12:a895e3581542 | 39 | void set_epoch_from_last_gps_time(void) |
koziniec | 12:a895e3581542 | 40 | { |
koziniec | 12:a895e3581542 | 41 | struct tm t; |
koziniec | 12:a895e3581542 | 42 | time_t t_of_day; |
koziniec | 12:a895e3581542 | 43 | char two_char_str[3] = {0}; |
koziniec | 12:a895e3581542 | 44 | memcpy(two_char_str, gpsfix_last_utc_date+4, 2); |
koziniec | 12:a895e3581542 | 45 | t.tm_year = atoi(two_char_str)+100; //Years since 1900 |
koziniec | 12:a895e3581542 | 46 | memcpy(two_char_str, gpsfix_last_utc_date+2, 2); |
koziniec | 12:a895e3581542 | 47 | t.tm_mon = atoi(two_char_str)-1; // Month, 0 - jan gpsfix_last_utc_date |
koziniec | 12:a895e3581542 | 48 | memcpy(two_char_str, gpsfix_last_utc_date, 2); |
koziniec | 12:a895e3581542 | 49 | t.tm_mday = atoi(two_char_str); // Day of the month gpsfix_last_utc_date |
koziniec | 12:a895e3581542 | 50 | memcpy(two_char_str, gpsfix_last_utc_time, 2); |
koziniec | 12:a895e3581542 | 51 | t.tm_hour = atoi(two_char_str); |
koziniec | 12:a895e3581542 | 52 | memcpy(two_char_str, gpsfix_last_utc_time+2, 2); |
koziniec | 12:a895e3581542 | 53 | t.tm_min = atoi(two_char_str); |
koziniec | 12:a895e3581542 | 54 | memcpy(two_char_str, gpsfix_last_utc_time+4, 2); |
koziniec | 12:a895e3581542 | 55 | t.tm_sec = atoi(two_char_str); |
koziniec | 12:a895e3581542 | 56 | t.tm_isdst = 0; // Is DST on? 1 = yes, 0 = no, -1 = unknown |
koziniec | 12:a895e3581542 | 57 | t_of_day = mktime(&t); |
koziniec | 12:a895e3581542 | 58 | printf("seconds since the Epoch: %ld\n", (long) t_of_day); |
koziniec | 12:a895e3581542 | 59 | } |
koziniec | 12:a895e3581542 | 60 | |
koziniec | 1:b8cb82927f33 | 61 | void gps_update(void) |
koziniec | 1:b8cb82927f33 | 62 | { |
koziniec | 1:b8cb82927f33 | 63 | gps_power(on); |
koziniec | 12:a895e3581542 | 64 | bool wait_for_fix = true; |
koziniec | 12:a895e3581542 | 65 | while (wait_for_fix) { |
koziniec | 7:4218bb385ca4 | 66 | int checksum = 0; |
koziniec | 8:b4a6c632c809 | 67 | char nmea_sentence[82] = {0}; //Fill with NULL terminators to save doing it later |
koziniec | 8:b4a6c632c809 | 68 | while (gps.getc()!='$'); //wait for start of sentence |
koziniec | 1:b8cb82927f33 | 69 | int nmea_index = 0; |
koziniec | 7:4218bb385ca4 | 70 | nmea_sentence[nmea_index] = '$'; //Manually insert the '$' because we don't want it included in the checksum loop |
koziniec | 8:b4a6c632c809 | 71 | char nmea_char = gps.getc(); //get sentence first char from GPS |
koziniec | 8:b4a6c632c809 | 72 | while (nmea_char != '*') { //Loop building sentence and calc'ing CS until * |
koziniec | 9:b8a60ade343e | 73 | checksum ^= nmea_char; //Calc checksum as we read sentence |
koziniec | 7:4218bb385ca4 | 74 | if ((nmea_sentence[nmea_index] == ',')&&(nmea_char == ',')) { |
koziniec | 8:b4a6c632c809 | 75 | nmea_sentence[++nmea_index] = ' '; //Pad consecutive comma with a space to make it possible to use strtok with empty values |
koziniec | 3:1dff075c1c88 | 76 | } |
koziniec | 7:4218bb385ca4 | 77 | nmea_sentence[++nmea_index] = nmea_char; //build the sentence with the next character |
koziniec | 1:b8cb82927f33 | 78 | if (nmea_index > 80) { |
koziniec | 3:1dff075c1c88 | 79 | nmea_index=80; //Don't overflow buffer |
koziniec | 1:b8cb82927f33 | 80 | } |
koziniec | 7:4218bb385ca4 | 81 | nmea_char = gps.getc(); //get next char from GPS |
koziniec | 1:b8cb82927f33 | 82 | } |
koziniec | 8:b4a6c632c809 | 83 | //Last character was the '*' so read the two hex digits of CS from gps |
koziniec | 8:b4a6c632c809 | 84 | char hex_checksum[3] = {0}; |
koziniec | 8:b4a6c632c809 | 85 | hex_checksum[0] = gps.getc(); |
koziniec | 8:b4a6c632c809 | 86 | hex_checksum[1] = gps.getc(); |
koziniec | 9:b8a60ade343e | 87 | if (checksum == (int)strtol(hex_checksum, NULL, 16) ) { |
koziniec | 9:b8a60ade343e | 88 | //Valid sentence so check if it's a GPRMC |
koziniec | 9:b8a60ade343e | 89 | //pc.printf("Match\n\r"); |
koziniec | 9:b8a60ade343e | 90 | const char gprmc[7] = "$GPRMC"; |
koziniec | 9:b8a60ade343e | 91 | char *token; |
koziniec | 9:b8a60ade343e | 92 | token = strtok(nmea_sentence, ","); |
koziniec | 9:b8a60ade343e | 93 | if (strcmp(token,gprmc) == 0) { //GPRMC ? |
koziniec | 9:b8a60ade343e | 94 | pc.printf( " %s\n\r", token ); //Get the time |
koziniec | 9:b8a60ade343e | 95 | if (token != NULL) { |
koziniec | 9:b8a60ade343e | 96 | token = strtok(NULL, ","); |
koziniec | 12:a895e3581542 | 97 | if (*token != 32) { //If there is a time present, record it. |
koziniec | 11:a9c16968e7f6 | 98 | pc.printf("Time: %s\n\r",token); |
koziniec | 11:a9c16968e7f6 | 99 | memcpy(gpsfix_last_utc_time, token, sizeof gpsfix_last_utc_time - 1); |
koziniec | 11:a9c16968e7f6 | 100 | } |
koziniec | 9:b8a60ade343e | 101 | } |
koziniec | 9:b8a60ade343e | 102 | if (token != NULL) { |
koziniec | 9:b8a60ade343e | 103 | token = strtok(NULL, ","); |
koziniec | 10:349d4fa9037f | 104 | if (*token == 'V') { |
koziniec | 10:349d4fa9037f | 105 | pc.printf("VOID"); |
koziniec | 10:349d4fa9037f | 106 | } |
koziniec | 9:b8a60ade343e | 107 | } |
koziniec | 12:a895e3581542 | 108 | if (*token == 'A') { //Is this an 'A'ctive (valid) fix? |
koziniec | 10:349d4fa9037f | 109 | pc.printf("Got a fix\n\r"); |
koziniec | 10:349d4fa9037f | 110 | gps_power(off); //Yes - No need for GPS now |
koziniec | 12:a895e3581542 | 111 | wait_for_fix = false; //Stop looping now we have a fix. |
koziniec | 10:349d4fa9037f | 112 | while (gps.readable()) { |
koziniec | 10:349d4fa9037f | 113 | char dummy = gps.getc(); //Empty serial buffer because overflows reveal MBED bugs :-( |
koziniec | 10:349d4fa9037f | 114 | } |
koziniec | 10:349d4fa9037f | 115 | if (token != NULL) { |
koziniec | 10:349d4fa9037f | 116 | token = strtok(NULL, ","); |
koziniec | 11:a9c16968e7f6 | 117 | //pc.printf("Latitude: %s\n\r",token); |
koziniec | 11:a9c16968e7f6 | 118 | memcpy(gpsfix_latitude, token, sizeof gpsfix_latitude - 1); |
koziniec | 10:349d4fa9037f | 119 | } |
koziniec | 10:349d4fa9037f | 120 | if (token != NULL) { |
koziniec | 10:349d4fa9037f | 121 | token = strtok(NULL, ","); |
koziniec | 11:a9c16968e7f6 | 122 | //pc.printf("North/South: %s\n\r",token); |
koziniec | 11:a9c16968e7f6 | 123 | gpsfix_ns = *token; |
koziniec | 10:349d4fa9037f | 124 | } |
koziniec | 10:349d4fa9037f | 125 | if (token != NULL) { |
koziniec | 10:349d4fa9037f | 126 | token = strtok(NULL, ","); |
koziniec | 12:a895e3581542 | 127 | //pc.printf("Longitude: %s\n\r",token); |
koziniec | 11:a9c16968e7f6 | 128 | memcpy(gpsfix_longtitude, token, sizeof gpsfix_longtitude - 1); |
koziniec | 10:349d4fa9037f | 129 | } |
koziniec | 10:349d4fa9037f | 130 | if (token != NULL) { |
koziniec | 10:349d4fa9037f | 131 | token = strtok(NULL, ","); |
koziniec | 12:a895e3581542 | 132 | //pc.printf("East/West: %s\n\r",token); |
koziniec | 11:a9c16968e7f6 | 133 | gpsfix_ew = *token; |
koziniec | 10:349d4fa9037f | 134 | } |
koziniec | 10:349d4fa9037f | 135 | if (token != NULL) { |
koziniec | 10:349d4fa9037f | 136 | token = strtok(NULL, ","); |
koziniec | 11:a9c16968e7f6 | 137 | //pc.printf("Speed in knots: %s\n\r",token); |
koziniec | 10:349d4fa9037f | 138 | } |
koziniec | 10:349d4fa9037f | 139 | if (token != NULL) { |
koziniec | 10:349d4fa9037f | 140 | token = strtok(NULL, ","); |
koziniec | 11:a9c16968e7f6 | 141 | //pc.printf("True course: %s\n\r",token); |
koziniec | 10:349d4fa9037f | 142 | } |
koziniec | 10:349d4fa9037f | 143 | if (token != NULL) { |
koziniec | 10:349d4fa9037f | 144 | token = strtok(NULL, ","); |
koziniec | 11:a9c16968e7f6 | 145 | //pc.printf("Date: %s\n\r",token); |
koziniec | 11:a9c16968e7f6 | 146 | memcpy(gpsfix_last_utc_date, token, sizeof gpsfix_last_utc_date - 1); |
koziniec | 10:349d4fa9037f | 147 | } |
koziniec | 10:349d4fa9037f | 148 | if (token != NULL) { |
koziniec | 10:349d4fa9037f | 149 | token = strtok(NULL, ","); |
koziniec | 11:a9c16968e7f6 | 150 | //pc.printf("Variation: %s\n\r",token); |
koziniec | 10:349d4fa9037f | 151 | } |
koziniec | 10:349d4fa9037f | 152 | if (token != NULL) { |
koziniec | 10:349d4fa9037f | 153 | token = strtok(NULL, ","); |
koziniec | 11:a9c16968e7f6 | 154 | //pc.printf("Variation East/West: %s\n\r",token); |
koziniec | 10:349d4fa9037f | 155 | } |
koziniec | 10:349d4fa9037f | 156 | } |
koziniec | 9:b8a60ade343e | 157 | } |
koziniec | 8:b4a6c632c809 | 158 | } |
koziniec | 4:e996385ca6d9 | 159 | while (gps.readable()) { |
koziniec | 4:e996385ca6d9 | 160 | char dummy = gps.getc(); |
koziniec | 1:b8cb82927f33 | 161 | } |
koziniec | 1:b8cb82927f33 | 162 | } |
koziniec | 12:a895e3581542 | 163 | } |
koziniec | 1:b8cb82927f33 | 164 | |
koziniec | 1:b8cb82927f33 | 165 | int main() |
koziniec | 1:b8cb82927f33 | 166 | { |
koziniec | 1:b8cb82927f33 | 167 | char data[2]; |
koziniec | 1:b8cb82927f33 | 168 | data[0] = 0x1A; //MAX14690 BootCfg register |
koziniec | 1:b8cb82927f33 | 169 | data[1] = 0x30; //Always-On Mode, off state via PWR_OFF_CMD |
koziniec | 0:59c04ca89ae2 | 170 | i2c.write( 0x50, data, 2 ); |
koziniec | 0:59c04ca89ae2 | 171 | |
koziniec | 1:b8cb82927f33 | 172 | data[0] = 0x17; //MAX14690 LDO3Vset register |
koziniec | 0:59c04ca89ae2 | 173 | data[1] = 0x19; //3.3V |
koziniec | 0:59c04ca89ae2 | 174 | i2c.write( 0x50, data, 2 ); |
koziniec | 1:b8cb82927f33 | 175 | gps_power(off); |
koziniec | 6:af25f19eb4e6 | 176 | wait(2); |
koziniec | 1:b8cb82927f33 | 177 | while (1) { |
koziniec | 1:b8cb82927f33 | 178 | gps_update(); |
koziniec | 12:a895e3581542 | 179 | set_epoch_from_last_gps_time(); |
koziniec | 12:a895e3581542 | 180 | wait(600); |
koziniec | 0:59c04ca89ae2 | 181 | } |
koziniec | 0:59c04ca89ae2 | 182 | } |
koziniec | 0:59c04ca89ae2 | 183 | |
koziniec | 0:59c04ca89ae2 | 184 | |
koziniec | 7:4218bb385ca4 | 185 | |
koziniec | 7:4218bb385ca4 | 186 | |
koziniec | 7:4218bb385ca4 | 187 | |
koziniec | 0:59c04ca89ae2 | 188 | |
koziniec | 7:4218bb385ca4 | 189 | |
koziniec | 0:59c04ca89ae2 | 190 | |
koziniec | 7:4218bb385ca4 | 191 |