ESP32 esp-idf Serial Over Bluetooth サンプルプログラム

example_spp_acceptor_demo.c
#define SPP_SHOW_DATA 0 #define SPP_SHOW_SPEED 1 //#define SPP_SHOW_MODE SPP_SHOW_SPEED /*Choose show mode: show data or speed*/ #define SPP_SHOW_MODE SPP_SHOW_DATA ← こちらにすると、受信データが、Hex表示されます。

同じだとつまらないので、Host側のシリアルターミナルに Echo Back をするようにしてみました。
example_spp_acceptor_demo.c
/* This example code is in the Public Domain (or CC0 licensed, at your option.) Unless required by applicable law or agreed to in writing, this software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */ #include <stdint.h> #include <string.h> #include <stdbool.h> #include <stdio.h> #include "nvs.h" #include "nvs_flash.h" #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "esp_log.h" #include "esp_bt.h" #include "esp_bt_main.h" #include "esp_gap_bt_api.h" #include "esp_bt_device.h" #include "esp_spp_api.h" #include "time.h" #include "sys/time.h" #define SPP_TAG "SPP_ACCEPTOR_DEMO" #define SPP_SERVER_NAME "SPP_SERVER" #define EXCAMPLE_DEVICE_NAME "ESP_SPP_ACCEPTOR" #define SPP_SHOW_DATA 0 #define SPP_SHOW_SPEED 1 //#define SPP_SHOW_MODE SPP_SHOW_SPEED /*Choose show mode: show data or speed*/ #define SPP_SHOW_MODE SPP_SHOW_DATA // add by nishi start #include "freertos/queue.h" #define QUEUE_SIZE 256 static uint32_t _spp_client = 0; static xQueueHandle _spp_queue = NULL; static xTaskHandle uart_task_dr_hdl = NULL; // add by nishi end static const esp_spp_mode_t esp_spp_mode = ESP_SPP_MODE_CB; static struct timeval time_new, time_old; static long data_num = 0; static const esp_spp_sec_t sec_mask = ESP_SPP_SEC_AUTHENTICATE; static const esp_spp_role_t role_slave = ESP_SPP_ROLE_SLAVE; static void print_speed(void) { float time_old_s = time_old.tv_sec + time_old.tv_usec / 1000000.0; float time_new_s = time_new.tv_sec + time_new.tv_usec / 1000000.0; float time_interval = time_new_s - time_old_s; float speed = data_num * 8 / time_interval / 1000.0; ESP_LOGI(SPP_TAG, "speed(%fs ~ %fs): %f kbit/s" , time_old_s, time_new_s, speed); data_num = 0; time_old.tv_sec = time_new.tv_sec; time_old.tv_usec = time_new.tv_usec; } static void esp_spp_cb(esp_spp_cb_event_t event, esp_spp_cb_param_t *param) { switch (event) { case ESP_SPP_INIT_EVT: ESP_LOGI(SPP_TAG, "ESP_SPP_INIT_EVT"); esp_bt_dev_set_device_name(EXCAMPLE_DEVICE_NAME); esp_bt_gap_set_scan_mode(ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE); esp_spp_start_srv(sec_mask,role_slave, 0, SPP_SERVER_NAME); break; case ESP_SPP_DISCOVERY_COMP_EVT: ESP_LOGI(SPP_TAG, "ESP_SPP_DISCOVERY_COMP_EVT"); break; case ESP_SPP_OPEN_EVT: ESP_LOGI(SPP_TAG, "ESP_SPP_OPEN_EVT"); break; case ESP_SPP_CLOSE_EVT: ESP_LOGI(SPP_TAG, "ESP_SPP_CLOSE_EVT"); _spp_client = 0; // add byy nishi break; case ESP_SPP_START_EVT: ESP_LOGI(SPP_TAG, "ESP_SPP_START_EVT"); break; case ESP_SPP_CL_INIT_EVT: ESP_LOGI(SPP_TAG, "ESP_SPP_CL_INIT_EVT"); break; case ESP_SPP_DATA_IND_EVT: #if (SPP_SHOW_MODE == SPP_SHOW_DATA) ESP_LOGI(SPP_TAG, "ESP_SPP_DATA_IND_EVT len=%d handle=%d", param->data_ind.len, param->data_ind.handle); //esp_log_buffer_hex("",param->data_ind.data,param->data_ind.len); if (_spp_queue != NULL){ for (int i = 0; i < param->data_ind.len; i++) xQueueSend(_spp_queue, param->data_ind.data + i, (TickType_t)0); } else { //log_e("SerialQueueBT ERROR"); } #else gettimeofday(&time_new, NULL); data_num += param->data_ind.len; if (time_new.tv_sec - time_old.tv_sec >= 3) { print_speed(); } #endif break; case ESP_SPP_CONG_EVT: ESP_LOGI(SPP_TAG, "ESP_SPP_CONG_EVT"); break; case ESP_SPP_WRITE_EVT: ESP_LOGI(SPP_TAG, "ESP_SPP_WRITE_EVT"); break; case ESP_SPP_SRV_OPEN_EVT: ESP_LOGI(SPP_TAG, "ESP_SPP_SRV_OPEN_EVT"); _spp_client = param->open.handle; // add b nishi gettimeofday(&time_old, NULL); break; default: break; } } void esp_bt_gap_cb(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_param_t *param) { switch (event) { case ESP_BT_GAP_AUTH_CMPL_EVT:{ if (param->auth_cmpl.stat == ESP_BT_STATUS_SUCCESS) { ESP_LOGI(SPP_TAG, "authentication success: %s", param->auth_cmpl.device_name); esp_log_buffer_hex(SPP_TAG, param->auth_cmpl.bda, ESP_BD_ADDR_LEN); } else { ESP_LOGE(SPP_TAG, "authentication failed, status:%d", param->auth_cmpl.stat); } break; } case ESP_BT_GAP_PIN_REQ_EVT:{ ESP_LOGI(SPP_TAG, "ESP_BT_GAP_PIN_REQ_EVT min_16_digit:%d", param->pin_req.min_16_digit); if (param->pin_req.min_16_digit) { ESP_LOGI(SPP_TAG, "Input pin code: 0000 0000 0000 0000"); esp_bt_pin_code_t pin_code = {0}; esp_bt_gap_pin_reply(param->pin_req.bda, true, 16, pin_code); } else { ESP_LOGI(SPP_TAG, "Input pin code: 1234"); esp_bt_pin_code_t pin_code; pin_code[0] = '1'; pin_code[1] = '2'; pin_code[2] = '3'; pin_code[3] = '4'; esp_bt_gap_pin_reply(param->pin_req.bda, true, 4, pin_code); } break; } case ESP_BT_GAP_CFM_REQ_EVT: ESP_LOGI(SPP_TAG, "ESP_BT_GAP_CFM_REQ_EVT Please compare the numeric value: %d", param->cfm_req.num_val); esp_bt_gap_ssp_confirm_reply(param->cfm_req.bda, true); break; case ESP_BT_GAP_KEY_NOTIF_EVT: ESP_LOGI(SPP_TAG, "ESP_BT_GAP_KEY_NOTIF_EVT passkey:%d", param->key_notif.passkey); break; case ESP_BT_GAP_KEY_REQ_EVT: ESP_LOGI(SPP_TAG, "ESP_BT_GAP_KEY_REQ_EVT Please enter passkey!"); break; default: { ESP_LOGI(SPP_TAG, "event: %d", event); break; } } return; } size_t BluetoothSerial_write(uint8_t c) { if (!_spp_client){ return 0; } uint8_t buffer[1]; buffer[0] = c; esp_err_t err = esp_spp_write(_spp_client, 1, buffer); return (err == ESP_OK) ? 1 : 0; } // Task to be created. void uart_task( void * pvParameters ) { uint8_t c; for( ;; ){ // Task code goes here. if (xQueueReceive(_spp_queue, &c, 0)){ ESP_LOGI(SPP_TAG, "%s():#3 c=%x",__func__,c); BluetoothSerial_write(c); } } } static void spp_uart_init(void) { static uint8_t ucParameterToPass; //xTaskCreate(uart_task, "uTask", 2048, (void*)UART_NUM_0, 8, NULL); //xTaskCreate( vTaskCode, "NAME", STACK_SIZE, &ucParameterToPass, tskIDLE_PRIORITY, &xHandle ); xTaskCreate(uart_task, "uTask", 2048, &ucParameterToPass, tskIDLE_PRIORITY, &uart_task_dr_hdl ); configASSERT(uart_task_dr_hdl); } void app_main() { esp_err_t ret = nvs_flash_init(); if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) { ESP_ERROR_CHECK(nvs_flash_erase()); ret = nvs_flash_init(); } ESP_ERROR_CHECK( ret ); ESP_ERROR_CHECK(esp_bt_controller_mem_release(ESP_BT_MODE_BLE)); esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT(); if ((ret = esp_bt_controller_init(&bt_cfg)) != ESP_OK) { ESP_LOGE(SPP_TAG, "%s initialize controller failed: %s\n", __func__, esp_err_to_name(ret)); return; } if ((ret = esp_bt_controller_enable(ESP_BT_MODE_CLASSIC_BT)) != ESP_OK) { ESP_LOGE(SPP_TAG, "%s enable controller failed: %s\n", __func__, esp_err_to_name(ret)); return; } if ((ret = esp_bluedroid_init()) != ESP_OK) { ESP_LOGE(SPP_TAG, "%s initialize bluedroid failed: %s\n", __func__, esp_err_to_name(ret)); return; } if ((ret = esp_bluedroid_enable()) != ESP_OK) { ESP_LOGE(SPP_TAG, "%s enable bluedroid failed: %s\n", __func__, esp_err_to_name(ret)); return; } if ((ret = esp_bt_gap_register_callback(esp_bt_gap_cb)) != ESP_OK) { ESP_LOGE(SPP_TAG, "%s gap register failed: %s\n", __func__, esp_err_to_name(ret)); return; } if ((ret = esp_spp_register_callback(esp_spp_cb)) != ESP_OK) { ESP_LOGE(SPP_TAG, "%s spp register failed: %s\n", __func__, esp_err_to_name(ret)); return; } if ((ret = esp_spp_init(esp_spp_mode)) != ESP_OK) { ESP_LOGE(SPP_TAG, "%s spp init failed: %s\n", __func__, esp_err_to_name(ret)); return; } // add by nishi start _spp_queue = xQueueCreate(QUEUE_SIZE, sizeof(uint8_t)); //initialize the queue if (_spp_queue == NULL){ ESP_LOGE(SPP_TAG,"%s Queue creation error\n", __func__); return; } // add by nishi end /* Set default parameters for Secure Simple Pairing */ esp_bt_sp_param_t param_type = ESP_BT_SP_IOCAP_MODE; esp_bt_io_cap_t iocap = ESP_BT_IO_CAP_IO; esp_bt_gap_set_security_param(param_type, &iocap, sizeof(uint8_t)); /* * Set default parameters for Legacy Pairing * Use variable pin, input pin code when pairing */ esp_bt_pin_type_t pin_type = ESP_BT_PIN_TYPE_VARIABLE; esp_bt_pin_code_t pin_code; esp_bt_gap_set_pin(pin_type, 0, pin_code); // add by nishi spp_uart_init(); }

このプログラムを作るきっかけは、CrowdWorks に RS232C の装置に、タブレット、エンベッドPCから、データを流し込む変換装置(Wi-Fi または、Bluetooth to RS232C)なる物を作って欲しい。旨の掲載があったので、自分でも簡単に出来るものか試してみようと思ったのがきっかけです。
https://crowdworks.jp/public/jobs/group/development

なので、次のステップは、ESP32 の uart2 デバイスに、RS232Cのケーブルを変換してデータをの送受信ができるか試してみます。