Inital Working Commit with I2C Version 2

2025-12-02 16:18:03 +01:00 · 2025-12-02 16:18:03 +01:00 · b99bee4018
commit b99bee4018
9 changed files with 1774 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,3 @@
+.cache
+build
+sdkconfig.*
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -0,0 +1,8 @@
+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+# "Trim" the build. Include the minimal set of components, main, and anything it depends on.
+idf_build_set_property(MINIMAL_BUILD ON)
+project(hello_world)
--- a/I2C_Example.drawio
+++ b/I2C_Example.drawio
@ -0,0 +1,100 @@
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--- a/I2C_Example.drawio.png
+++ b/I2C_Example.drawio.png
--- a/15
+++ b/15
@ -0,0 +1,15 @@
+all:
+	echo "no default rule"
+
+export:
+	source ~/esp/esp-idf/export.fish && fish
+
+buildIdf:
+	idf.py build 
+
+flashMini:
+	idf.py flash -p /dev/ttyACM0 
+
+monitorMini:
+	idf.py monitor -p /dev/ttyACM0 
+
--- a/README.md
+++ b/README.md
@ -0,0 +1,32 @@
+# I2C Master Send, Slave Receive Example
+
+# !IMPORTANT
+Use I2C Version 2 (activate it in menuconfig I2C_ENABLE_SLAVE_DRIVER_VERSION_2)
+
+## Test Setup
+
+- 2 x ESP32C3
+- 4 x Jumper Kabel
+- 2 x 4,7kΩ
+
+![Example Setup](I2C_Example.drawio.png)
+
+I2C Bus Pulled Up to 3,3V
+
+## Flash the Program and Monitor
+
+```bash
+idf.py flash -p /dev/ttyACM0
+idf.py flash -p /dev/ttyACM1
+```
+
+```bash
+idf.py monitor -p /dev/ttyACM0
+idf.py monitor -p /dev/ttyACM1
+```
+
+You should see
+`Received from master: Hello I2C`
+and
+`Master Sending Data`
+
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@ -0,0 +1,3 @@
+idf_component_register(SRCS "main.c"
+                       PRIV_REQUIRES spi_flash driver 
+                       INCLUDE_DIRS "")
--- a/main/main.c
+++ b/main/main.c
@ -0,0 +1,155 @@
+/*
+ * SPDX-FileCopyrightText: 2010-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ */
+
+#include "driver/gpio.h"
+#include "driver/i2c_master.h"
+#include "driver/i2c_slave.h"
+#include "esp_attr.h"
+#include "esp_chip_info.h"
+#include "esp_flash.h"
+#include "esp_system.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/idf_additions.h"
+#include "freertos/projdefs.h"
+#include "freertos/task.h"
+#include "portmacro.h"
+#include "sdkconfig.h"
+#include <inttypes.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/_intsup.h>
+
+#define TEST_I2C_PORT 0
+#define I2C_MASTER_SCL_IO 9
+#define I2C_MASTER_SDA_IO 8
+
+#define I2C_SLAVE_SCL_IO 9
+#define I2C_SLAVE_SDA_IO 8
+#define ESP_SLAVE_ADDR 0x28
+#define I2C_SLAVE_NUM 0
+
+#define MASTER_MODE_PIN 4 // pin pulled to ground to set master
+
+#define DATA_LEN 64
+
+typedef struct {
+  QueueHandle_t event_queue;
+  i2c_slave_dev_handle_t handle;
+} i2c_context_t;
+
+typedef struct {
+  uint8_t buf[DATA_LEN];
+  // size_t buf_len; i2c version 2 themes to have this in its data, not needed
+  // for example
+} i2c_slave_message_t;
+
+static i2c_context_t context;
+
+static IRAM_ATTR uint8_t rx_buf[DATA_LEN];
+
+void master_task(void *param) {
+  i2c_master_bus_config_t i2c_mst_config = {
+      .clk_source = I2C_CLK_SRC_DEFAULT,
+      .i2c_port = TEST_I2C_PORT,
+      .scl_io_num = I2C_MASTER_SCL_IO,
+      .sda_io_num = I2C_MASTER_SDA_IO,
+      .glitch_ignore_cnt = 7,
+  };
+
+  i2c_master_bus_handle_t bus_handle;
+  ESP_ERROR_CHECK(i2c_new_master_bus(&i2c_mst_config, &bus_handle));
+
+  i2c_device_config_t dev_cfg = {
+      .dev_addr_length = I2C_ADDR_BIT_LEN_7,
+      .device_address = ESP_SLAVE_ADDR,
+      .scl_speed_hz = 100000,
+  };
+
+  i2c_master_dev_handle_t dev_handle;
+  ESP_ERROR_CHECK(i2c_master_bus_add_device(bus_handle, &dev_cfg, &dev_handle));
+
+  uint8_t data_wr[] = "Hello I2C\n";
+
+  while (true) {
+    ESP_ERROR_CHECK(
+        i2c_master_transmit(dev_handle, data_wr, sizeof(data_wr), -1));
+    printf("Master Sending Data\n");
+    vTaskDelay(1000 / portTICK_PERIOD_MS);
+  }
+}
+
+static IRAM_ATTR bool
+i2c_slave_receive_cb(i2c_slave_dev_handle_t i2c_slave,
+                     const i2c_slave_rx_done_event_data_t *evt_data,
+                     void *arg) {
+
+  i2c_context_t *ctx = (i2c_context_t *)arg;
+
+  i2c_slave_message_t msg = {};
+
+  if (evt_data->length > DATA_LEN) {
+    return false;
+  }
+
+  memcpy(msg.buf, evt_data->buffer, evt_data->length);
+
+  BaseType_t task_woken = pdFALSE;
+  xQueueSendFromISR(ctx->event_queue, &msg, &task_woken);
+  return task_woken;
+}
+
+void slave_task(void *param) {
+
+  i2c_slave_config_t cfg = {
+      .i2c_port = I2C_SLAVE_NUM,
+      //.clk_source = I2C_CLK_SRC_DEFAULT,
+      .scl_io_num = I2C_SLAVE_SCL_IO,
+      .sda_io_num = I2C_SLAVE_SDA_IO,
+      .slave_addr = ESP_SLAVE_ADDR,
+      .send_buf_depth = 64,
+      .receive_buf_depth = 64,
+  };
+
+  context.event_queue = xQueueCreate(10, sizeof(i2c_slave_message_t));
+
+  i2c_slave_dev_handle_t slave;
+  ESP_ERROR_CHECK(i2c_new_slave_device(&cfg, &slave));
+
+  i2c_slave_event_callbacks_t cbs = {
+      .on_receive = i2c_slave_receive_cb,
+  };
+
+  ESP_ERROR_CHECK(i2c_slave_register_event_callbacks(slave, &cbs, &context));
+
+  i2c_slave_message_t msg;
+
+  while (true) {
+    if (xQueueReceive(context.event_queue, &msg, portMAX_DELAY)) {
+      printf("Received from master: %s\n", msg.buf);
+    }
+  }
+}
+
+void app_main(void) {
+  printf("I2C Example\n");
+
+  // GPIO-Pin für Moduserkennung
+  gpio_reset_pin(MASTER_MODE_PIN);
+  gpio_set_direction(MASTER_MODE_PIN, GPIO_MODE_INPUT);
+  bool isMaster = (gpio_get_level(MASTER_MODE_PIN) == 0);
+
+  if (isMaster) {
+    printf("Started in Master Mode Register Task Master\n");
+    xTaskCreate(master_task, "MasterTask", 4096, NULL, 1, NULL);
+  } else {
+    printf("Started in Slave Mode Register Task Slave\n");
+    xTaskCreate(slave_task, "MasterTask", 4096, NULL, 1, NULL);
+  }
+
+  vTaskDelay(1000 / portTICK_PERIOD_MS);
+}
--- a/1458
+++ b/1458