1 files changed, 101 insertions, 0 deletions
diff --git a/code/esp32/components/eos/i2c.c b/code/esp32/components/eos/i2c.c
new file mode 100644
index 0000000..dcc313d
--- /dev/null
+++ b/code/esp32/components/eos/i2c.c
@@ -0,0 +1,101 @@
+#include <stdio.h>
+#include <esp_log.h>
+#include <driver/i2c.h>
+
+#include "eos.h"
+
+static const char *TAG = "I2C";
+
+#define I2C_MASTER_NUM              I2C_NUM_0
+#define I2C_MASTER_FREQ_HZ          100000
+#define I2C_MASTER_SCL_IO           26
+#define I2C_MASTER_SDA_IO           25
+
+#define I2C_MASTER_TX_BUF_DISABLE   0       /*!< I2C master doesn't need buffer */
+#define I2C_MASTER_RX_BUF_DISABLE   0       /*!< I2C master doesn't need buffer */
+#define ACK_CHECK_EN                0x1     /*!< I2C master will check ack from slave*/
+#define ACK_CHECK_DIS               0x0     /*!< I2C master will not check ack from slave */
+#define ACK_VAL                     0x0     /*!< I2C ack value */
+#define NCK_VAL                     0x1     /*!< I2C nack value */
+
+/**
+ * @brief i2c initialization
+ */
+
+void eos_i2c_init(void) {
+    i2c_config_t conf;
+    conf.mode = I2C_MODE_MASTER;
+    conf.sda_io_num = I2C_MASTER_SDA_IO;
+    conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
+    conf.scl_io_num = I2C_MASTER_SCL_IO;
+    conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
+    conf.master.clk_speed = I2C_MASTER_FREQ_HZ;
+    i2c_param_config(I2C_MASTER_NUM, &conf);
+    i2c_driver_install(I2C_MASTER_NUM, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
+}
+
+/**
+ * @brief i2c read
+ */
+
+int eos_i2c_read(uint8_t addr, uint8_t reg, uint8_t *data, size_t len) {
+    int i, ret;
+    i2c_cmd_handle_t cmd = i2c_cmd_link_create();
+    i2c_master_start(cmd);
+    i2c_master_write_byte(cmd, addr << 1 | I2C_MASTER_WRITE, ACK_CHECK_EN);
+    i2c_master_write_byte(cmd, reg, ACK_CHECK_EN);
+    i2c_master_start(cmd);
+    i2c_master_write_byte(cmd, addr << 1 | I2C_MASTER_READ, ACK_CHECK_EN);
+    for (i=0; i < len - 1; i++) {
+        i2c_master_read_byte(cmd, data+i, ACK_VAL);
+    }
+    i2c_master_read_byte(cmd, data+i, NCK_VAL);
+    i2c_master_stop(cmd);
+    ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_RATE_MS);
+    i2c_cmd_link_delete(cmd);
+    if (ret != ESP_OK) {
+        return EOS_ERR;
+    }
+    return EOS_OK;
+}
+
+/**
+ * @brief i2c read8
+ */
+
+uint8_t eos_i2c_read8(uint8_t addr, uint8_t reg) {
+    uint8_t data;
+    eos_i2c_read(addr, reg, &data, 1);
+    return data;
+}
+
+/**
+ * @brief i2c write
+ */
+
+int eos_i2c_write(uint8_t addr, uint8_t reg, uint8_t *data, size_t len) {
+    int i, ret;
+    i2c_cmd_handle_t cmd = i2c_cmd_link_create();
+    i2c_master_start(cmd);
+    i2c_master_write_byte(cmd, addr << 1 | I2C_MASTER_WRITE, ACK_CHECK_EN);
+    i2c_master_write_byte(cmd, reg, ACK_CHECK_EN);
+    for (i=0; i < len; i++) {
+        i2c_master_write_byte(cmd, *(data+i), ACK_CHECK_EN);
+    }
+    i2c_master_stop(cmd);
+    ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_RATE_MS);
+    i2c_cmd_link_delete(cmd);
+    if (ret != ESP_OK) {
+        return EOS_ERR;
+    }
+    return EOS_OK;
+}
+
+/**
+ * @brief i2c write8
+ */
+
+void eos_i2c_write8(uint8_t addr, uint8_t reg, uint8_t data) {
+    eos_i2c_write(addr, reg, &data, 1);
+}
+