A simple example of a serial communication interface for setting variables in an Mbed program with help of mydsc library.
main.cpp@4:e315db7c4dea, 2020-03-28 (annotated)
- Committer:
- ghsalazar
- Date:
- Sat Mar 28 16:09:30 2020 +0000
- Revision:
- 4:e315db7c4dea
- Parent:
- 2:f884fffe2c4b
Initial commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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ghsalazar | 0:46aa79a823ee | 1 | /** |
ghsalazar | 0:46aa79a823ee | 2 | @file main.cpp |
ghsalazar | 0:46aa79a823ee | 3 | @author Gastón SALAZAR <gaston_salazar@yahoo.com> |
ghsalazar | 0:46aa79a823ee | 4 | */ |
ghsalazar | 0:46aa79a823ee | 5 | |
ghsalazar | 0:46aa79a823ee | 6 | #include "mbed.h" |
ghsalazar | 1:2cd22f07b879 | 7 | #include "stdio.h" |
ghsalazar | 1:2cd22f07b879 | 8 | #include "stdlib.h" |
ghsalazar | 4:e315db7c4dea | 9 | #include "string.h" |
ghsalazar | 1:2cd22f07b879 | 10 | #include "ctype.h" |
ghsalazar | 0:46aa79a823ee | 11 | |
ghsalazar | 1:2cd22f07b879 | 12 | #include "mydsc_kvp.h" |
ghsalazar | 4:e315db7c4dea | 13 | #include "mydsc_error.h" |
ghsalazar | 0:46aa79a823ee | 14 | |
ghsalazar | 4:e315db7c4dea | 15 | // Hardware Interface |
ghsalazar | 4:e315db7c4dea | 16 | DigitalOut led (LED1); |
ghsalazar | 4:e315db7c4dea | 17 | Serial serial (USBTX, USBRX); |
ghsalazar | 4:e315db7c4dea | 18 | InterruptIn button (USER_BUTTON); |
ghsalazar | 4:e315db7c4dea | 19 | |
ghsalazar | 4:e315db7c4dea | 20 | |
ghsalazar | 4:e315db7c4dea | 21 | // Behavior interface |
ghsalazar | 4:e315db7c4dea | 22 | const unsigned MESSAGE_MAX_LEN = 126; |
ghsalazar | 4:e315db7c4dea | 23 | const char END_OF_LINE = 015; |
ghsalazar | 4:e315db7c4dea | 24 | const unsigned VALUE_SIZE = 128; |
ghsalazar | 4:e315db7c4dea | 25 | const unsigned short BUFFER_SIZE = 128; |
ghsalazar | 4:e315db7c4dea | 26 | |
ghsalazar | 4:e315db7c4dea | 27 | unsigned long delay = 5000000UL; |
ghsalazar | 4:e315db7c4dea | 28 | |
ghsalazar | 4:e315db7c4dea | 29 | char message[MESSAGE_MAX_LEN+2]; |
ghsalazar | 4:e315db7c4dea | 30 | |
ghsalazar | 4:e315db7c4dea | 31 | volatile bool semaphore_input = false; |
ghsalazar | 4:e315db7c4dea | 32 | volatile bool semaphore_button = false; |
ghsalazar | 4:e315db7c4dea | 33 | |
ghsalazar | 4:e315db7c4dea | 34 | // This set of functions are callbacks |
ghsalazar | 0:46aa79a823ee | 35 | |
ghsalazar | 4:e315db7c4dea | 36 | void on_rx() |
ghsalazar | 4:e315db7c4dea | 37 | { |
ghsalazar | 4:e315db7c4dea | 38 | static char c; |
ghsalazar | 4:e315db7c4dea | 39 | static unsigned index = 0; |
ghsalazar | 4:e315db7c4dea | 40 | |
ghsalazar | 4:e315db7c4dea | 41 | c = serial.getc(); |
ghsalazar | 4:e315db7c4dea | 42 | message[index] = c; |
ghsalazar | 4:e315db7c4dea | 43 | index++; |
ghsalazar | 4:e315db7c4dea | 44 | message[index] = '\0'; |
ghsalazar | 4:e315db7c4dea | 45 | if ((END_OF_LINE == c) || (MESSAGE_MAX_LEN+1) == index) { |
ghsalazar | 4:e315db7c4dea | 46 | semaphore_input = true; |
ghsalazar | 4:e315db7c4dea | 47 | index = 0; |
ghsalazar | 4:e315db7c4dea | 48 | } |
ghsalazar | 4:e315db7c4dea | 49 | } |
ghsalazar | 1:2cd22f07b879 | 50 | |
ghsalazar | 4:e315db7c4dea | 51 | void on_user_button() |
ghsalazar | 4:e315db7c4dea | 52 | { |
ghsalazar | 4:e315db7c4dea | 53 | semaphore_button = !semaphore_button; |
ghsalazar | 4:e315db7c4dea | 54 | serial.printf("\r\n%s\r\nOk > ", (semaphore_button? "Paused": "Running")); |
ghsalazar | 4:e315db7c4dea | 55 | } |
ghsalazar | 4:e315db7c4dea | 56 | |
ghsalazar | 4:e315db7c4dea | 57 | char* get_delay(void) |
ghsalazar | 0:46aa79a823ee | 58 | { |
ghsalazar | 1:2cd22f07b879 | 59 | static char value[VALUE_SIZE]; |
ghsalazar | 1:2cd22f07b879 | 60 | |
ghsalazar | 4:e315db7c4dea | 61 | sprintf(value, "%lu", delay); |
ghsalazar | 1:2cd22f07b879 | 62 | return value; |
ghsalazar | 0:46aa79a823ee | 63 | } |
ghsalazar | 0:46aa79a823ee | 64 | |
ghsalazar | 4:e315db7c4dea | 65 | int set_delay(char* value) |
ghsalazar | 1:2cd22f07b879 | 66 | { |
ghsalazar | 4:e315db7c4dea | 67 | sscanf(value, "%lu", &delay); |
ghsalazar | 4:e315db7c4dea | 68 | return MYDSC_SUCCESS; |
ghsalazar | 0:46aa79a823ee | 69 | } |
ghsalazar | 0:46aa79a823ee | 70 | |
ghsalazar | 0:46aa79a823ee | 71 | int main() |
ghsalazar | 0:46aa79a823ee | 72 | { |
ghsalazar | 1:2cd22f07b879 | 73 | // Setup |
ghsalazar | 4:e315db7c4dea | 74 | static char command_buffer[BUFFER_SIZE]; |
ghsalazar | 4:e315db7c4dea | 75 | static char key_buffer[BUFFER_SIZE]; |
ghsalazar | 4:e315db7c4dea | 76 | static char value_buffer[BUFFER_SIZE]; |
ghsalazar | 4:e315db7c4dea | 77 | long unsigned delay_count = delay; |
ghsalazar | 1:2cd22f07b879 | 78 | |
ghsalazar | 1:2cd22f07b879 | 79 | Serial serial(USBTX, USBRX); |
ghsalazar | 1:2cd22f07b879 | 80 | serial.baud(9600); |
ghsalazar | 1:2cd22f07b879 | 81 | serial.printf("\r\nHello, world!"); |
ghsalazar | 1:2cd22f07b879 | 82 | |
ghsalazar | 4:e315db7c4dea | 83 | // Setting the key-value list up |
ghsalazar | 1:2cd22f07b879 | 84 | mydsc_kvp_t kvp; |
ghsalazar | 1:2cd22f07b879 | 85 | mydsc_kvp_init(&kvp); |
ghsalazar | 4:e315db7c4dea | 86 | |
ghsalazar | 4:e315db7c4dea | 87 | // Setting the callbacks up |
ghsalazar | 4:e315db7c4dea | 88 | serial.attach(&on_rx, Serial::RxIrq); |
ghsalazar | 4:e315db7c4dea | 89 | button.fall(&on_user_button); |
ghsalazar | 4:e315db7c4dea | 90 | mydsc_kvp_append(&kvp, "delay", &get_delay, &set_delay); |
ghsalazar | 4:e315db7c4dea | 91 | serial.printf("\r\nOK > "); |
ghsalazar | 4:e315db7c4dea | 92 | |
ghsalazar | 4:e315db7c4dea | 93 | led = 1; |
ghsalazar | 1:2cd22f07b879 | 94 | |
ghsalazar | 1:2cd22f07b879 | 95 | while(1) { |
ghsalazar | 1:2cd22f07b879 | 96 | // Loop |
ghsalazar | 1:2cd22f07b879 | 97 | int result = 0; |
ghsalazar | 1:2cd22f07b879 | 98 | char* value = ""; |
ghsalazar | 1:2cd22f07b879 | 99 | |
ghsalazar | 4:e315db7c4dea | 100 | if (semaphore_input == true) { |
ghsalazar | 4:e315db7c4dea | 101 | semaphore_input = false; |
ghsalazar | 4:e315db7c4dea | 102 | strcpy(command_buffer, strtok(message," \015")); |
ghsalazar | 4:e315db7c4dea | 103 | if (strcmp(command_buffer, "set") == 0) { |
ghsalazar | 4:e315db7c4dea | 104 | strcpy(key_buffer, strtok(NULL," \015")); |
ghsalazar | 4:e315db7c4dea | 105 | strcpy(value_buffer, strtok(NULL, " \015")); |
ghsalazar | 4:e315db7c4dea | 106 | result = mydsc_kvp_set_value(&kvp, key_buffer, value_buffer); |
ghsalazar | 4:e315db7c4dea | 107 | if (result != MYDSC_SUCCESS) |
ghsalazar | 4:e315db7c4dea | 108 | serial.printf("\r\nError: %s", mydsc_error[result]); |
ghsalazar | 4:e315db7c4dea | 109 | } |
ghsalazar | 4:e315db7c4dea | 110 | else if (strcmp(command_buffer,"get") == 0) { |
ghsalazar | 4:e315db7c4dea | 111 | strcpy(key_buffer, strtok(NULL," \015")); |
ghsalazar | 4:e315db7c4dea | 112 | value = mydsc_kvp_get_value(&kvp,key_buffer); |
ghsalazar | 4:e315db7c4dea | 113 | if (NULL != value) |
ghsalazar | 4:e315db7c4dea | 114 | serial.printf("\r\n%s", value); |
ghsalazar | 4:e315db7c4dea | 115 | else |
ghsalazar | 4:e315db7c4dea | 116 | serial.printf("\r\nError: %s", mydsc_error[MYDSC_KVP_NO_KEY]); |
ghsalazar | 4:e315db7c4dea | 117 | } |
ghsalazar | 4:e315db7c4dea | 118 | else if (strcmp(command_buffer,"help") == 0) { |
ghsalazar | 4:e315db7c4dea | 119 | serial.printf("\r\nAvailable commands are: get help set"); |
ghsalazar | 4:e315db7c4dea | 120 | } |
ghsalazar | 1:2cd22f07b879 | 121 | else |
ghsalazar | 4:e315db7c4dea | 122 | serial.printf("\r\nError: %s doesn't exist\r\n", command_buffer); |
ghsalazar | 4:e315db7c4dea | 123 | serial.printf("\r\nOk > "); |
ghsalazar | 1:2cd22f07b879 | 124 | } |
ghsalazar | 4:e315db7c4dea | 125 | if (!delay_count) { |
ghsalazar | 4:e315db7c4dea | 126 | led = !led; |
ghsalazar | 4:e315db7c4dea | 127 | delay_count = delay; |
ghsalazar | 1:2cd22f07b879 | 128 | } |
ghsalazar | 4:e315db7c4dea | 129 | if (!semaphore_button) |
ghsalazar | 4:e315db7c4dea | 130 | delay_count--; |
ghsalazar | 1:2cd22f07b879 | 131 | } |
ghsalazar | 0:46aa79a823ee | 132 | } |