/* Barcode sensor */ #include "barcode_sensor_init.h" #define MAX_BARCODES 10 // Define the maximum number of barcodes to store #define BARCODE_SENSOR_TIMER_PERIOD_MS 100 // Define the barcode sensor timer period // Define the barcode sensor timer static struct repeating_timer barcode_sensor_timer; /** * @brief Decode a Code 39 barcode * * This function decodes a Code 39 barcode represented as a 9-bit binary number. * * @param barcode_data Binary representation of the barcode data (9 bits) * @return Decoded value as an integer */ int code39_decode(uint32_t barcode_data) { // Define the binary representations of Code 39 characters const uint32_t code39_characters[] = { 0b001001001, // 0 0b001001011, // 1 0b001011001, // 2 0b001011011, // 3 0b001100011, // 4 0b001101001, // 5 0b001101011, // 6 0b001010011, // 7 0b001011101, // 8 0b001111001, // 9 // Add more character representations as needed }; // Compare the barcode data to known Code 39 character representations for (int i = 0; i < 10; i++) { if (barcode_data == code39_characters[i]) { return i; // Return the decoded value (0-9) } } // If the barcode data does not match any known character, return -1 to indicate an error return -1; } /** * @brief Monitor the barcode sensor * * This function will monitor the barcode sensor and send the state to the * barcode sensor message buffer, including Code 39 decoding. * * @param params */ void monitor_barcode_sensor_task(void *params) { // Create the barcode sensor timer add_repeating_timer_ms(BARCODE_SENSOR_TIMER_PERIOD_MS, h_barcode_sensor_timer_handler, NULL, &barcode_sensor_timer); for (;;) { if (xSemaphoreTake(g_barcode_sensor_sem, portMAX_DELAY) == pdTRUE) { // Check the flag or receive the message if (barcode_sensor_triggered == pdTRUE) { uint32_t barcode_data = 0; int bar_width = 0; // Variable to store the width of the current bar for (int i = 0; i < 9; i++) { sleep_ms(100); // Wait for a segment of the barcode // Measure bar width using the IR sensor if (gpio_get(BARCODE_SENSOR_PIN)) { bar_width++; } else { // Bar ended, process the width if (bar_width > 0) { printf("Bar Width: %d\n", bar_width); // Process or store the bar width as needed bar_width = 0; // Reset the bar width measurement } barcode_data |= (1u << i); } } printf("Barcode Data (binary): %09b\n", barcode_data); // Decode the barcode data int decoded_value = code39_decode(barcode_data); if (decoded_value != -1) { printf("Decoded Value: %d\n", decoded_value); // Store or process the decoded value as needed // Send the decoded value instead of the raw barcode data xMessageBufferSend(barcode_sensor_msg_buffer, &decoded_value, sizeof(int), 0); } else { printf("Error: Unable to decode the barcode.\n"); } // Reset the flag barcode_sensor_triggered = pdFALSE; } } } } /** * @brief Monitor the barcode sensor * @param params */ void monitor_barcode_task(__unused void *params) { state_t barcode_state; // Receive from Buffer xMessageBufferReceive(barcode_sensor_msg_buffer, &barcode_state, sizeof(state_t), portMAX_DELAY); }