kopia lustrzana https://github.com/SP8EBC/ParaTNC
308 wiersze
9.3 KiB
C
308 wiersze
9.3 KiB
C
/*
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* sim800c.c
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*
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* Created on: Jan 18, 2022
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* Author: mateusz
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*/
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#include "gsm/sim800c.h"
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#include "gsm/sim800c_engineering.h"
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#include "main.h"
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#include <string.h>
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#include <stdlib.h>
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static const char * AUTOBAUD_STRING = "AT\r\0";
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static const char * GET_SIGNAL_LEVEL = "AT+CSQ\r\0";
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static const char * GET_NETWORK_REGISTRATION = "AT+CREG?\r\0";
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static const char * GET_PIN_STATUS = "AT+CPIN?\r\0";
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static const char * GET_REGISTERED_NETWORK = "AT+COPS?\r\0";
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static const char * OK = "OK\r\n\0";
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static const char * SIGNAL_LEVEL = "+CSQ:\0";
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static const char * NETWORK_REGISTRATION = "+CREG:\0";
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static const char * CPIN = "+CPIN:\0";
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static const char * CPIN_READY = "READY";
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static const char * CPIN_SIMPIN = "SIMPIN";
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static const char * REGISTERED_NETWORK = "+COPS:\0";
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uint32_t gsm_time_of_last_command_send_to_module = 0;
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// let's the library know if gsm module echoes every AT command send through serial port
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static uint8_t gsm_at_comm_echo = 1;
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// used to receive echo and response separately
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static uint8_t gsm_receive_newline_counter = 0;
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// first character of non-echo response from the module
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static uint16_t gsm_response_start_idx = 0;
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// a pointer to the last command string which sent in SIM800_INITIALIZING state
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const char * gsm_at_command_sent_last = 0;
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// set to one to lock 'gsm_sim800_pool' in SIM800_INITIALIZING state until the response is received
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static uint8_t gsm_waiting_for_command_response = 0;
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uint8_t gsm_sim800_registration_status = 4; // unknown
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// string with sim status
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char gsm_sim800_sim_status[10];
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char gsm_sim800_registered_network[16];
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int8_t gsm_sim800_signal_level_dbm = 0;
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float gsm_sim800_bcch_frequency = 0;
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char gsm_sim800_cellid[5] = {0, 0, 0, 0, 0};
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char gsm_sim800_lac[5] = {0, 0, 0, 0, 0};
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static void replace_non_printable_with_space(char * str) {
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for (int i = 0; *(str + i) != 0 ; i++) {
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char current = *(str + i);
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if (current != 0x00) {
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if (current < 0x21 || current > 0x7A) {
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*(str + i) = ' ';
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}
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}
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}
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}
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void gsm_sim800_init(gsm_sim800_state_t * state, uint8_t enable_echo) {
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gsm_at_comm_echo = enable_echo;
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gsm_response_start_idx = 0;
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if (state != 0x00) {
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*state = SIM800_NOT_YET_COMM;
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}
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}
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void gsm_sim800_pool(srl_context_t * srl_context, gsm_sim800_state_t * state) {
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if (*state == SIM800_NOT_YET_COMM) {
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// configure rx timeout
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srl_switch_timeout(srl_context, 1, 0);
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// send handshake
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srl_send_data(srl_context, (const uint8_t*) AUTOBAUD_STRING, SRL_MODE_ZERO, strlen(AUTOBAUD_STRING), SRL_INTERNAL);
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// switch the state
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*state = SIM800_HANDSHAKING;
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// wait for the handshake to transmit
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srl_wait_for_tx_completion(srl_context);
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// start data reception
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srl_receive_data_with_callback(srl_context, gsm_sim800_rx_terminating_callback);
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// record when the handshake has been sent
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gsm_time_of_last_command_send_to_module = main_get_master_time();
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}
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else if (*state == SIM800_INITIALIZING && gsm_waiting_for_command_response == 0) {
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// check what command has been sent
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//switch ((uint32_t)gsm_at_command_sent_last) {
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if (gsm_at_command_sent_last == 0) {
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// no command has been send so far
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// ask for network registration status
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srl_send_data(srl_context, (const uint8_t*) GET_NETWORK_REGISTRATION, SRL_MODE_ZERO, strlen(GET_NETWORK_REGISTRATION), SRL_INTERNAL);
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// wait for command completion
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srl_wait_for_tx_completion(srl_context);
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gsm_at_command_sent_last = GET_NETWORK_REGISTRATION;
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gsm_waiting_for_command_response = 1;
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srl_receive_data_with_callback(srl_context, gsm_sim800_rx_terminating_callback);
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}
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else if (gsm_at_command_sent_last == GET_NETWORK_REGISTRATION) {
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// ask for network registration status
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srl_send_data(srl_context, (const uint8_t*) GET_PIN_STATUS, SRL_MODE_ZERO, strlen(GET_PIN_STATUS), SRL_INTERNAL);
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// wait for command completion
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srl_wait_for_tx_completion(srl_context);
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gsm_at_command_sent_last = GET_PIN_STATUS;
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gsm_waiting_for_command_response = 1;
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srl_receive_data_with_callback(srl_context, gsm_sim800_rx_terminating_callback);
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}
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else if (gsm_at_command_sent_last == GET_PIN_STATUS) {
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// ask for network registration status
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srl_send_data(srl_context, (const uint8_t*) GET_REGISTERED_NETWORK, SRL_MODE_ZERO, strlen(GET_REGISTERED_NETWORK), SRL_INTERNAL);
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// wait for command completion
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srl_wait_for_tx_completion(srl_context);
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gsm_at_command_sent_last = GET_REGISTERED_NETWORK;
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gsm_waiting_for_command_response = 1;
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srl_receive_data_with_callback(srl_context, gsm_sim800_rx_terminating_callback);
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}
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else if (gsm_at_command_sent_last == GET_REGISTERED_NETWORK) {
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// ask for signal level
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srl_send_data(srl_context, (const uint8_t*) GET_SIGNAL_LEVEL, SRL_MODE_ZERO, strlen(GET_SIGNAL_LEVEL), SRL_INTERNAL);
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// wait for command completion
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srl_wait_for_tx_completion(srl_context);
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gsm_at_command_sent_last = GET_SIGNAL_LEVEL;
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gsm_waiting_for_command_response = 1;
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srl_receive_data_with_callback(srl_context, gsm_sim800_rx_terminating_callback);
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}
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else if (gsm_at_command_sent_last == GET_SIGNAL_LEVEL) {
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*state = SIM800_ALIVE;
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}
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}
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}
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/**
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* Callback to be called just after the reception is done
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*/
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uint8_t gsm_sim800_rx_terminating_callback(uint8_t current_data, const uint8_t * const rx_buffer, uint16_t rx_bytes_counter) {
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char current = (char) current_data;
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char before = '\0';
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int8_t terminating_newline_counter = 1;
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// special case for CENG request
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if (gsm_at_command_sent_last == ENGINEERING_GET) {
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terminating_newline_counter = 4;
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}
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if (rx_bytes_counter > 0) {
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before = (char) *(rx_buffer + rx_bytes_counter - 1);
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}
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// check what character has been received
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if (current == '\n') {
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// increase newline counter
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gsm_receive_newline_counter++;
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}
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// check if this is first character of response (first printable after the echo)
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if (current != '\n' && current != '\r' && (before == '\n' || before == '\r') && gsm_receive_newline_counter < 2) {
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gsm_response_start_idx = rx_bytes_counter;
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}
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// if an echo is enabled and second newline has been received
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if (gsm_at_comm_echo == 1 && gsm_receive_newline_counter > terminating_newline_counter && gsm_response_start_idx > 0) {
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gsm_receive_newline_counter = 0;
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gsm_waiting_for_command_response = 0;
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return 1;
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}
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return 0;
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}
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void gsm_sim800_rx_done_event_handler(srl_context_t * srl_context, gsm_sim800_state_t * state) {
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int comparision_result = 123;
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gsm_waiting_for_command_response = 0;
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// if the library expects to receive a handshake from gsm module
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if (*state == SIM800_HANDSHAKING) {
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comparision_result = strcmp(OK, (const char *)(srl_context->srl_rx_buf_pointer + gsm_response_start_idx));
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// if 'OK' has been received from the module
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if (comparision_result == 0) {
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*state = SIM800_INITIALIZING;
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}
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else {
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*state = SIM800_NOT_YET_COMM;
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}
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}
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else if (*state == SIM800_INITIALIZING) {
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if (gsm_at_command_sent_last == GET_NETWORK_REGISTRATION) {
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comparision_result = strncmp(NETWORK_REGISTRATION, (const char *)(srl_context->srl_rx_buf_pointer + gsm_response_start_idx), 5);
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if (comparision_result == 0) {
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comparision_result = atoi((const char *)(srl_context->srl_rx_buf_pointer + gsm_response_start_idx + 9));
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if (comparision_result >= 0 && comparision_result < 6) {
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gsm_sim800_registration_status = (int8_t)comparision_result;
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}
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}
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}
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else if (gsm_at_command_sent_last == GET_PIN_STATUS) {
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comparision_result = strncmp(CPIN, (const char *)(srl_context->srl_rx_buf_pointer + gsm_response_start_idx), 5);
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if (comparision_result == 0) {
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strncpy(gsm_sim800_sim_status, (const char *)(srl_context->srl_rx_buf_pointer + gsm_response_start_idx + 7), 10);
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replace_non_printable_with_space(gsm_sim800_sim_status);
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}
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}
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else if (gsm_at_command_sent_last == GET_REGISTERED_NETWORK) {
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comparision_result = strncmp(REGISTERED_NETWORK, (const char *)(srl_context->srl_rx_buf_pointer + gsm_response_start_idx), 5);
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if (comparision_result == 0) {
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strncpy(gsm_sim800_registered_network, (const char *)(srl_context->srl_rx_buf_pointer + gsm_response_start_idx + 12), 16);
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replace_non_printable_with_space(gsm_sim800_registered_network);
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}
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}
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else if (gsm_at_command_sent_last == GET_SIGNAL_LEVEL) {
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comparision_result = strncmp(SIGNAL_LEVEL, (const char *)(srl_context->srl_rx_buf_pointer + gsm_response_start_idx), 5);
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if (comparision_result == 0) {
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comparision_result = atoi((const char *)(srl_context->srl_rx_buf_pointer + gsm_response_start_idx + 6));
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if (comparision_result > 1 && comparision_result < 32) {
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gsm_sim800_signal_level_dbm = -110 + 2 * comparision_result;
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}
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else if (comparision_result == 1) {
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gsm_sim800_signal_level_dbm = -111;
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}
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else {
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gsm_sim800_signal_level_dbm = -115;
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}
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}
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}
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}
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else if (*state == SIM800_ALIVE_WAITING_MODEM_RESP) {
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if (gsm_at_command_sent_last == ENGINEERING_ENABLE) {
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gsm_sim800_engineering_response_callback(srl_context, state, gsm_response_start_idx);
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}
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else if (gsm_at_command_sent_last == ENGINEERING_GET) {
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gsm_sim800_engineering_response_callback(srl_context, state, gsm_response_start_idx);
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}
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*state = SIM800_ALIVE;
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}
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}
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void gsm_sim800_tx_done_event_handler(srl_context_t * srl_context, gsm_sim800_state_t * state) {
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if (*state == SIM800_ALIVE_SENDING_TO_MODEM) {
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srl_receive_data_with_callback(srl_context, gsm_sim800_rx_terminating_callback);
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*state = SIM800_ALIVE_WAITING_MODEM_RESP;
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}
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}
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