update

2025-05-04 00:42:15 +02:00
parent 88efccb65a
commit f280a2a1ca
8 changed files with 197 additions and 40 deletions
--- a/main/lipton/i2c.c
+++ b/main/lipton/i2c.c
@@ -0,0 +1,110 @@
+/*
+ * I2C Module
+ *
+ * Provides I2C Access routines for other modules/tasks.  Provides a locking mechanism
+ * since the underlying ESP IDF routines are not thread safe.
+ *
+ * Copyright 2020-2022 Dan Julio
+ *
+ * This file is part of tCam.
+ *
+ * tCam is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * tCam is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with tCam.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+// #include "system_config.h"
+#include "i2c.h"
+#include "driver/i2c.h"
+#include "lepton_system.h"
+// #include "freertos/FreeRTOS.h"
+// #include "freertos/semphr.h"
+
+
+//
+// I2C API
+//
+
+/**
+ * i2c master initialization
+ */
+esp_err_t i2c_master_init(int scl_pin, int sda_pin)
+{
+    int i2c_master_port = I2C_MASTER_NUM;
+    i2c_config_t conf;
+
+    // Configure the I2C controller in master mode using the pins provided
+    conf.mode = I2C_MODE_MASTER;
+    conf.sda_io_num = sda_pin;
+    conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
+    conf.scl_io_num = scl_pin;
+    conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
+    conf.master.clk_speed = I2C_MASTER_FREQ_HZ;
+    conf.clk_flags = 0;
+    esp_err_t err = i2c_param_config((i2c_port_t)i2c_master_port, &conf);
+    if (err != ESP_OK) {
+        return err;
+    }
+
+    // Install the I2C driver
+    return i2c_driver_install((i2c_port_t)i2c_master_port, conf.mode,
+                              I2C_MASTER_RX_BUF_LEN,
+                              I2C_MASTER_TX_BUF_LEN, 0);
+}
+
+
+/**
+ * Read esp-i2c-slave
+ *
+ * _______________________________________________________________________________________
+ * | start | slave_addr + rd_bit +ack | read n-1 bytes + ack | read 1 byte + nack | stop |
+ * --------|--------------------------|----------------------|--------------------|------|
+ *
+ */
+esp_err_t i2c_master_read_slave(uint8_t addr7, uint8_t *data_rd, size_t size)
+{
+    if (size == 0) {
+        return ESP_OK;
+    }
+    i2c_cmd_handle_t cmd = i2c_cmd_link_create();
+    i2c_master_start(cmd);
+    i2c_master_write_byte(cmd, (addr7 << 1) | I2C_MASTER_READ, ACK_CHECK_EN);
+    if (size > 1) {
+        i2c_master_read(cmd, data_rd, size - 1, ACK_VAL);
+    }
+    i2c_master_read_byte(cmd, data_rd + size - 1, NACK_VAL);
+    i2c_master_stop(cmd);
+    esp_err_t ret = i2c_master_cmd_begin((i2c_port_t)I2C_MODE_MASTER, cmd, 1000 / portTICK_PERIOD_MS);
+    i2c_cmd_link_delete(cmd);
+    return ret;
+}
+
+
+/**
+ * Write esp-i2c-slave
+ *
+ * ___________________________________________________________________
+ * | start | slave_addr + wr_bit + ack | write n bytes + ack  | stop |
+ * --------|---------------------------|----------------------|------|
+ *
+ */
+esp_err_t i2c_master_write_slave(uint8_t addr7, uint8_t *data_wr, size_t size)
+{
+    i2c_cmd_handle_t cmd = i2c_cmd_link_create();
+    i2c_master_start(cmd);
+    i2c_master_write_byte(cmd, (addr7 << 1) | I2C_MASTER_WRITE, ACK_CHECK_EN);
+    i2c_master_write(cmd, data_wr, size, ACK_CHECK_EN);
+    i2c_master_stop(cmd);
+    esp_err_t ret = i2c_master_cmd_begin((i2c_port_t)I2C_MODE_MASTER, cmd, 1000 / portTICK_PERIOD_MS);
+    i2c_cmd_link_delete(cmd);
+    return ret;
+}