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-rw-r--r--src/gpio.c44
-rw-r--r--src/main.c147
-rw-r--r--src/serial.c122
3 files changed, 194 insertions, 119 deletions
diff --git a/src/gpio.c b/src/gpio.c
new file mode 100644
index 0000000..0ccfd6b
--- /dev/null
+++ b/src/gpio.c
@@ -0,0 +1,44 @@
+#include <gpiod.h>
+#include <stdio.h>
+
+int modemPowerToggle(int pinNum) {
+ struct gpiod_chip *chip;
+ struct gpiod_line *line;
+
+ chip = gpiod_chip_open("/dev/gpiochip0");
+ if (!chip) {
+ perror("Error opening GPIO chip");
+ return 1;
+ }
+
+ line = gpiod_chip_get_line(
+ chip, pinNum); // Replace with the desired GPIO pin number
+ if (!line) {
+ perror("Error getting GPIO line");
+ gpiod_chip_close(chip);
+ return 1;
+ }
+
+ if (gpiod_line_request_output(line, "cellular modem power toggle", 0) < 0) {
+ perror("Error setting GPIO line as output");
+ gpiod_chip_close(chip);
+ return 1;
+ }
+
+ if (gpiod_line_set_value(line, 1) < 0) {
+ perror("Error setting GPIO line high");
+ gpiod_chip_close(chip);
+ return 1;
+ }
+
+ sleep(1);
+
+ if (gpiod_line_set_value(line, 0) < 0) {
+ perror("Error setting GPIO line low");
+ gpiod_chip_close(chip);
+ return 1;
+ }
+
+ gpiod_chip_close(chip);
+ return 0;
+}
diff --git a/src/main.c b/src/main.c
index b8b7639..a2a9846 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,130 +1,15 @@
-#include <errno.h> /* strerror() */
-#include <fcntl.h> /* O_RDWR */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <termios.h>
-#include <time.h>
-#include <unistd.h> /* write(), read(), close() */
-#define BUFFER_SIZE 256
-
-int openSerialPort(char pathToPort[]) {
-
- static int serialPort;
- struct termios serialTerminal;
-
- serialPort = open(pathToPort, O_RDWR);
- if (serialPort < 0) {
- printf("Error open(): %s\n", strerror(errno));
- return -1;
- }
-
- if (tcgetattr(serialPort, &serialTerminal) != 0) {
- printf("Error tcgetattr(): %s\n", strerror(errno));
- close(serialPort);
- return -1;
- }
-
- serialTerminal.c_cflag |= CREAD;
-
- /* serialTerminal.c_iflag &= ~(BRKINT | IGNBRK | INLCR | IGNCR | ICRNL | IXOFF
- | IUTF8 | IUCLC | IXANY | IMAXBEL); */
- serialTerminal.c_iflag &=
- ~(IGNBRK | BRKINT | INLCR | IGNCR | ICRNL | IXON | IXOFF | IUCLC | IXANY |
- IMAXBEL | IGNPAR | PARMRK | INPCK | ISTRIP);
-
- /* serialTerminal.c_lflag &= ~(ECHO | ECHONL | NOFLSH | ISIG | TOSTOP | ICANON
- | IEXTEN | ECHOE | ECHOK); */
- serialTerminal.c_lflag &= ~(ICANON | ISIG | ECHO | ECHONL | ECHOE | ECHOK);
-
- /* serialTerminal.c_oflag &=
- ~(OLCUC | OCRNL | OPOST | OFILL | ONLCR | ONOCR | ONLRET | OFDEL); */
- serialTerminal.c_oflag &= ~(OPOST);
-
- serialTerminal.c_cc[VTIME] = 0;
- serialTerminal.c_cc[VMIN] = 0;
-
- cfsetispeed(&serialTerminal, B115200);
- cfsetospeed(&serialTerminal, B115200);
-
- if (tcsetattr(serialPort, TCSANOW, &serialTerminal) != 0) {
- printf("Error tcsetattr(): %s\n", strerror(errno));
- close(serialPort);
- return -1;
- }
-
- return serialPort;
-}
-
-int querySerialPort(int serialPort, char *input) {
-
- time_t timeStart;
- unsigned long idx;
- int bytesRead, bufferFree, returnCode, isEnd,
- bufferSize = sizeof(char) * BUFFER_SIZE; /* initial size in bytes */
- char *txBuffer, *buffer = calloc(BUFFER_SIZE, sizeof(char));
- const char *responseCodes[8] = {"\r\nOK\r\n", "\r\nCONNECT\r\n",
- "\r\nRING\r\n", "\r\nNO CARRIER\r\n",
- "\r\nERROR\r\n", "\r\nNO DIALTONE\r\n",
- "\r\nBUSY\r\n", "\r\nNO ANSWER\r\n"};
-
- txBuffer = malloc(sizeof(char) * (strlen(input) + 2));
- strncpy(txBuffer, input, sizeof(char) * (strlen(input) + 1));
- strncat(txBuffer, "\r", 2 * sizeof(char));
- if (write(serialPort, txBuffer, sizeof(char) * (strlen(txBuffer))) < 0) {
- printf("Error write(): %s\n", strerror(errno));
- free(txBuffer);
- free(buffer);
- return 1;
- }
- free(txBuffer);
-
- bytesRead = bufferFree = bufferSize;
- returnCode = isEnd = 0;
- timeStart = time(NULL);
- while (!isEnd) {
- bytesRead =
- read(serialPort, buffer + bufferSize - bufferFree, bufferFree - 1);
- if (bytesRead < 0) {
- printf("Error reading serial port\n");
- returnCode = 1;
- break;
- }
-
- else if (bytesRead > 0) {
- buffer[bytesRead] = '\0';
- bufferFree -= (bytesRead + 1);
-
- if (bufferFree == 0) {
- bufferSize += bufferFree = BUFFER_SIZE;
- buffer = realloc(buffer, bufferSize);
- }
-
- for (idx = 0; idx < sizeof(responseCodes) / sizeof(*responseCodes);
- idx++) {
- if (strstr(buffer, responseCodes[idx])) {
- isEnd = 1;
- break;
- }
- }
- } else if (bytesRead == 0 && time(NULL) - timeStart > 180) {
- printf("Response timeout after 180 seconds\n");
- returnCode = 1;
- break;
- }
- }
-
- printf("%s\n", buffer);
- free(buffer);
- return returnCode;
-}
+#include <gpio.h>
+#include <serial.h>
int main() {
char *commandList[] = {"AT", "ATI", "AT+COPS?"/* ,
"AT+COPS=?" */},
- serialFilePath[] = "/dev/serial0";
+ serialFilePath[] = "/dev/serial0", *output = malloc(1);
int serialPort;
unsigned long idx;
@@ -132,18 +17,42 @@ int main() {
serialPort = openSerialPort(serialFilePath);
if (serialPort < 0) {
printf("Error openSerialPort()\n");
+ free(output);
return 1;
}
+ if (0 != querySerialPort(&output, serialPort, "AT")) {
+ printf("Error querySerialPort()\n");
+ close(serialPort);
+ free(output);
+ return 1;
+ }
+ if (NULL == strstr(output, "OK\r\n")) {
+ if (0 != modemPowerToggle(17)) {
+ printf("Error toggling modem power\n");
+ free(output);
+ return 1;
+ }
+ }
+
for (idx = 0; idx < sizeof(commandList) / sizeof(*commandList); idx++) {
- if (0 != querySerialPort(serialPort, commandList[idx])) {
+ if (0 != querySerialPort(&output, serialPort, commandList[idx])) {
printf("Error querySerialPort()\n");
close(serialPort);
+ free(output);
return 1;
}
+ printf("%s", output);
}
close(serialPort);
+ if (0 != modemPowerToggle(17)) {
+ printf("Error toggling modem power\n");
+ free(output);
+ return 1;
+ }
+
+ free(output);
return 0;
}
diff --git a/src/serial.c b/src/serial.c
new file mode 100644
index 0000000..0fd83fd
--- /dev/null
+++ b/src/serial.c
@@ -0,0 +1,122 @@
+#include <errno.h>
+#include <fcntl.h> /* O_RDWR */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <time.h>
+
+#define BUFFER_SIZE 256
+
+int openSerialPort(char pathToPort[]) {
+
+ static int serialPort;
+ struct termios serialTerminal;
+
+ serialPort = open(pathToPort, O_RDWR);
+ if (serialPort < 0) {
+ printf("Error open(): %s\n", strerror(errno));
+ return -1;
+ }
+
+ if (tcgetattr(serialPort, &serialTerminal) != 0) {
+ printf("Error tcgetattr(): %s\n", strerror(errno));
+ close(serialPort);
+ return -1;
+ }
+
+ serialTerminal.c_cflag |= CREAD;
+
+ /* serialTerminal.c_iflag &= ~(BRKINT | IGNBRK | INLCR | IGNCR | ICRNL | IXOFF
+ | IUTF8 | IUCLC | IXANY | IMAXBEL); */
+ serialTerminal.c_iflag &=
+ ~(IGNBRK | BRKINT | INLCR | IGNCR | ICRNL | IXON | IXOFF | IUCLC | IXANY |
+ IMAXBEL | IGNPAR | PARMRK | INPCK | ISTRIP);
+
+ /* serialTerminal.c_lflag &= ~(ECHO | ECHONL | NOFLSH | ISIG | TOSTOP | ICANON
+ | IEXTEN | ECHOE | ECHOK); */
+ serialTerminal.c_lflag &= ~(ICANON | ISIG | ECHO | ECHONL | ECHOE | ECHOK);
+
+ /* serialTerminal.c_oflag &=
+ ~(OLCUC | OCRNL | OPOST | OFILL | ONLCR | ONOCR | ONLRET | OFDEL); */
+ serialTerminal.c_oflag &= ~(OPOST);
+
+ serialTerminal.c_cc[VTIME] = 0;
+ serialTerminal.c_cc[VMIN] = 0;
+
+ cfsetispeed(&serialTerminal, B115200);
+ cfsetospeed(&serialTerminal, B115200);
+
+ if (tcsetattr(serialPort, TCSANOW, &serialTerminal) != 0) {
+ printf("Error tcsetattr(): %s\n", strerror(errno));
+ close(serialPort);
+ return -1;
+ }
+
+ return serialPort;
+}
+
+int querySerialPort(char **output, int serialPort, char *input) {
+
+ time_t timeStart;
+ unsigned long idx;
+ int bytesRead, bufferFree, returnCode, isEnd,
+ bufferSize = sizeof(char) * BUFFER_SIZE; /* initial size in bytes */
+ char *txBuffer, *buffer = calloc(BUFFER_SIZE, sizeof(char));
+ const char *responseCodes[8] = {"\r\nOK\r\n", "\r\nCONNECT\r\n",
+ "\r\nRING\r\n", "\r\nNO CARRIER\r\n",
+ "\r\nERROR\r\n", "\r\nNO DIALTONE\r\n",
+ "\r\nBUSY\r\n", "\r\nNO ANSWER\r\n"};
+
+ txBuffer = malloc(sizeof(char) * (strlen(input) + 2));
+ strncpy(txBuffer, input, sizeof(char) * (strlen(input) + 1));
+ strncat(txBuffer, "\r", 2 * sizeof(char));
+ if (write(serialPort, txBuffer, sizeof(char) * (strlen(txBuffer))) < 0) {
+ printf("Error write(): %s\n", strerror(errno));
+ free(txBuffer);
+ free(buffer);
+ return 1;
+ }
+ free(txBuffer);
+
+ bytesRead = 0;
+ bufferFree = bufferSize;
+ returnCode = isEnd = 0;
+ timeStart = time(NULL);
+ while (!isEnd) {
+ bytesRead =
+ read(serialPort, buffer + bufferSize - bufferFree, bufferFree - 1);
+ if (bytesRead < 0) {
+ printf("Error reading serial port\n");
+ returnCode = 1;
+ break;
+ }
+
+ else if (bytesRead > 0) {
+ buffer[bytesRead] = '\0';
+ bufferFree -= (bytesRead + 1);
+
+ if (bufferFree == 0) {
+ bufferSize += bufferFree = BUFFER_SIZE;
+ buffer = realloc(buffer, bufferSize);
+ }
+
+ for (idx = 0; idx < sizeof(responseCodes) / sizeof(*responseCodes);
+ idx++) {
+ if (strstr(buffer, responseCodes[idx])) {
+ isEnd = 1;
+ break;
+ }
+ }
+ } else if (bytesRead == 0 && time(NULL) - timeStart > 180) {
+ printf("Response timeout after 180 seconds\n");
+ returnCode = 1;
+ break;
+ }
+ }
+
+ *output = realloc(*output, bufferSize);
+ strncpy(*output, buffer, bufferSize);
+ free(buffer);
+ return returnCode;
+} \ No newline at end of file
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