LAUNCHCC3220MODASF: UART Initialization and Handling Large Responses from GSM Modem on CC3220MODASF Launchpad

noushadali k

Tool/software:

Hi TI tech Team,

I am working with the CC3220MODASF launchpad and trying to communicate with a GSM modem using AT commands. My question is how to initialize the UART and handle reading when the GSM modem's response is a large string?

my UART initilization for GSM menttioned below

UART_init();

UART_Params_init(&uartParams);
uartParams.writeDataMode = UART_DATA_BINARY;
uartParams.readDataMode = UART_DATA_BINARY;
uartParams.readReturnMode = UART_RETURN_FULL;
uartParams.readEcho = UART_ECHO_OFF;
uartParams.baudRate = 115200;
uartParams.readTimeout = UART_WAIT_FOREVER; // 500
Gsm_uart= UART_open(CONFIG_UART_1, &uartParams);

if (Gsm_uart == NULL) {
// UART_open() failed
while (1);
}

UART reading handle

Fullscreen

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
void printBuffer() {
    buffer[buffer_index] = '\0'; // Null-terminate the buffer
    //Display_printf(display, 0, 0, "%s", buffer); // Print the buffer as a string
    strcat(UART_READ, buffer);
    buffer_index = 0; // Reset buffer index for next data
}
int readGSMUART(char *output, size_t max_length, int timeout_ms) {
    unsigned long start_time = Timer_getMillis();
    while (Timer_getMillis() - start_time < timeout_ms) {
        if (UART_read(Gsm_uart, &input, 1) > 0) {
            if (input >= 32 && input <= 126) {
                buffer[buffer_index++] = input; // Store the character in the buffer
                if (buffer_index >= MAX_BUFFER_SIZE - 1) {
                    printBuffer();
                }
            } else if (input == '\n' || input == '\r') {
                printBuffer(); // Handle newline or carriage return
                if (strlen(UART_READ) > 0) {
                    // Check if the response is complete (usually by checking for specific patterns or length)
                    if (strstr(UART_READ, "OK") || strstr(UART_READ, "ERROR") || strstr(UART_READ, ">") || (strlen(UART_READ) >= max_length - 1)) {
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

void printBuffer() {
    buffer[buffer_index] = '\0'; // Null-terminate the buffer
    //Display_printf(display, 0, 0, "%s", buffer); // Print the buffer as a string
    strcat(UART_READ, buffer);
    buffer_index = 0; // Reset buffer index for next data
}
int readGSMUART(char *output, size_t max_length, int timeout_ms) {
    unsigned long start_time = Timer_getMillis();

    while (Timer_getMillis() - start_time < timeout_ms) {
        if (UART_read(Gsm_uart, &input, 1) > 0) {
            if (input >= 32 && input <= 126) {
                buffer[buffer_index++] = input; // Store the character in the buffer
                if (buffer_index >= MAX_BUFFER_SIZE - 1) {
                    printBuffer();
                }
            } else if (input == '\n' || input == '\r') {
                printBuffer(); // Handle newline or carriage return
                if (strlen(UART_READ) > 0) {
                    // Check if the response is complete (usually by checking for specific patterns or length)
                    if (strstr(UART_READ, "OK") || strstr(UART_READ, "ERROR") || strstr(UART_READ, ">") || (strlen(UART_READ) >= max_length - 1)) {

                        strncpy(output, UART_READ, max_length - 1); // Copy to output
                        output[max_length - 1] = '\0'; // Ensure null-terminated string
                        memset(UART_READ, 0, MAX_BUFFER_SIZE);
                        return 1; // Successfully read response
                    }
                }
            }
        }
    }

    if (strlen(UART_READ) > 0) {
        removeOKFromResponse(UART_READ);
        strncpy(output, UART_READ, max_length - 1); // Copy to output
        output[max_length - 1] = '\0'; // Ensure null-terminated string
        memset(UART_READ, 0, MAX_BUFFER_SIZE);
        return 1; // Successfully read response
    }

    output[0] = '\0'; // In case of timeout or failure
    Display_printf(display, 0, 0, "UART_READ TIMEOUT or FAILURE\n");
    return 0;
}

8 months ago