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+/******************************************************************************
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+ * Copyright 2013-2014 Espressif Systems (Wuxi)
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+ *
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+ * FileName: i2c_sw_master.c
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+ *
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+ * Description: i2c master API
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+ *
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+ * Modification history:
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+ * 2014/3/12, v1.0 create this file.
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+*******************************************************************************/
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+#include "driver/gpio.h"
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+
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+#include "driver/i2c_sw_master.h"
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+
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+static uint8_t m_nLastSDA;
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+static uint8_t m_nLastSCL;
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+
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+static uint8_t pinSDA;
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+static uint8_t pinSCL;
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+
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+/******************************************************************************
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+ * FunctionName : i2c_sw_master_setDC
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+ * Description : Internal used function -
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+ * set i2c SDA and SCL bit value for half clk cycle
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+ * Parameters : uint8_t SDA
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+ * uint8_t SCL
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+ * Returns : NONE
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+*******************************************************************************/
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+static void i2c_sw_master_setDC(uint8_t SDA, uint8_t SCL)
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+{
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+ uint8_t sclLevel;
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+
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+ SDA &= 0x01;
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+ SCL &= 0x01;
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+ m_nLastSDA = SDA;
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+ m_nLastSCL = SCL;
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+
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+ gpio_set_level(pinSDA, SDA);
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+ gpio_set_level(pinSCL, SCL);
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+ if(1 == SCL) {
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+ do {
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+ sclLevel = gpio_get_level(pinSCL);
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+ } while(sclLevel == 0);
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+ }
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+}
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+
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+/******************************************************************************
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+ * FunctionName : i2c_sw_master_getDC
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+ * Description : Internal used function -
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+ * get i2c SDA bit value
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+ * Parameters : NONE
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+ * Returns : uint8_t - SDA bit value
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+*******************************************************************************/
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+static uint8_t i2c_sw_master_getDC(void)
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+{
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+ return gpio_get_level(pinSDA);
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+}
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+
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+/******************************************************************************
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+ * FunctionName : i2c_sw_master_init
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+ * Description : initilize I2C bus to enable i2c operations
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+ * Parameters : NONE
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+ * Returns : NONE
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+*******************************************************************************/
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+void i2c_sw_master_init(void)
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+{
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+ uint8_t i;
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+
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+ i2c_sw_master_setDC(1, 0);
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+ i2c_sw_master_wait(5);
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+
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+ // when SCL = 0, toggle SDA to clear up
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+ i2c_sw_master_setDC(0, 0);
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+ i2c_sw_master_wait(5);
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+ i2c_sw_master_setDC(1, 0);
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+ i2c_sw_master_wait(5);
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+
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+ // set data_cnt to max value
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+ for (i = 0; i < 28; i++) {
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+ i2c_sw_master_setDC(1, 0);
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+ i2c_sw_master_wait(5); // sda 1, scl 0
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+ i2c_sw_master_setDC(1, 1);
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+ i2c_sw_master_wait(5); // sda 1, scl 1
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+ }
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+
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+ // reset all
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+ i2c_sw_master_stop();
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+ return;
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+}
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+
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+uint8_t i2c_sw_master_get_pinSDA()
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+{
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+ return pinSDA;
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+}
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+
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+uint8_t i2c_sw_master_get_pinSCL()
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+{
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+ return pinSCL;
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+}
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+
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+/******************************************************************************
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+ * FunctionName : i2c_sw_master_gpio_init
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+ * Description : config SDA and SCL gpio to open-drain output mode,
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+ * mux and gpio num defined in i2c_sw_master.h
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+ * Parameters : NONE
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+ * Returns : NONE
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+*******************************************************************************/
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+void i2c_sw_master_gpio_init(uint8 sda, uint8 scl)
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+{
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+ pinSDA = sda;
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+ pinSCL = scl;
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+
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+ gpio_config_t cfg;
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+
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+ cfg.pin_bit_mask = 1 << sda | 1 << scl;
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+ cfg.mode = GPIO_MODE_INPUT_OUTPUT_OD;
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+ cfg.pull_up_en = GPIO_PULLUP_ENABLE;
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+ cfg.pull_down_en = GPIO_PULLDOWN_DISABLE;
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+ cfg.intr_type = GPIO_INTR_DISABLE;
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+
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+ if (ESP_OK != gpio_config(&cfg))
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+ return;
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+
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+ gpio_set_level(scl, 1);
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+ gpio_set_level(sda, 1);
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+
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+ i2c_sw_master_init();
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+}
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+
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+/******************************************************************************
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+ * FunctionName : i2c_sw_master_start
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+ * Description : set i2c to send state
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+ * Parameters : NONE
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+ * Returns : NONE
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+*******************************************************************************/
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+void i2c_sw_master_start(void)
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+{
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+ i2c_sw_master_setDC(1, m_nLastSCL);
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+ i2c_sw_master_wait(5);
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+ i2c_sw_master_setDC(1, 1);
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+ i2c_sw_master_wait(5); // sda 1, scl 1
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+ i2c_sw_master_setDC(0, 1);
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+ i2c_sw_master_wait(5); // sda 0, scl 1
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+}
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+
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+/******************************************************************************
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+ * FunctionName : i2c_sw_master_stop
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+ * Description : set i2c to stop sending state
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+ * Parameters : NONE
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+ * Returns : NONE
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+*******************************************************************************/
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+void i2c_sw_master_stop(void)
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+{
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+ i2c_sw_master_wait(5);
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+
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+ i2c_sw_master_setDC(0, m_nLastSCL);
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+ i2c_sw_master_wait(5); // sda 0
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+ i2c_sw_master_setDC(0, 1);
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+ i2c_sw_master_wait(5); // sda 0, scl 1
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+ i2c_sw_master_setDC(1, 1);
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+ i2c_sw_master_wait(5); // sda 1, scl 1
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+}
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+
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+/******************************************************************************
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+ * FunctionName : i2c_sw_master_setAck
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+ * Description : set ack to i2c bus as level value
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+ * Parameters : uint8_t level - 0 or 1
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+ * Returns : NONE
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+*******************************************************************************/
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+void i2c_sw_master_setAck(uint8_t level)
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+{
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+ i2c_sw_master_setDC(m_nLastSDA, 0);
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+ i2c_sw_master_wait(5);
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+ i2c_sw_master_setDC(level, 0);
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+ i2c_sw_master_wait(5); // sda level, scl 0
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+ i2c_sw_master_setDC(level, 1);
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+ i2c_sw_master_wait(8); // sda level, scl 1
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+ i2c_sw_master_setDC(level, 0);
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+ i2c_sw_master_wait(5); // sda level, scl 0
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+ i2c_sw_master_setDC(1, 0);
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+ i2c_sw_master_wait(5);
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+}
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+
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+/******************************************************************************
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+ * FunctionName : i2c_sw_master_getAck
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+ * Description : confirm if peer send ack
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+ * Parameters : NONE
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+ * Returns : uint8_t - ack value, 0 or 1
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+*******************************************************************************/
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+uint8_t i2c_sw_master_getAck(void)
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+{
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+ uint8_t retVal;
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+ i2c_sw_master_setDC(m_nLastSDA, 0);
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+ i2c_sw_master_wait(5);
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+ i2c_sw_master_setDC(1, 0);
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+ i2c_sw_master_wait(5);
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+ i2c_sw_master_setDC(1, 1);
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+ i2c_sw_master_wait(5);
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+
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+ retVal = i2c_sw_master_getDC();
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+ i2c_sw_master_wait(5);
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+ i2c_sw_master_setDC(1, 0);
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+ i2c_sw_master_wait(5);
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+
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+ return retVal;
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+}
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+
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+/******************************************************************************
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+* FunctionName : i2c_sw_master_checkAck
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+* Description : get dev response
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+* Parameters : NONE
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+* Returns : true : get ack ; false : get nack
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+*******************************************************************************/
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+bool i2c_sw_master_checkAck(void)
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+{
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+ if (i2c_sw_master_getAck()) {
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+ return false;
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+ } else {
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+ return true;
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+ }
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+}
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+
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+/******************************************************************************
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+* FunctionName : i2c_sw_master_send_ack
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+* Description : response ack
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+* Parameters : NONE
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+* Returns : NONE
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+*******************************************************************************/
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+void i2c_sw_master_send_ack(void)
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+{
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+ i2c_sw_master_setAck(0x0);
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+}
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+
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+/******************************************************************************
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+* FunctionName : i2c_sw_master_send_nack
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+* Description : response nack
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+* Parameters : NONE
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+* Returns : NONE
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+*******************************************************************************/
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+void i2c_sw_master_send_nack(void)
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+{
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+ i2c_sw_master_setAck(0x1);
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+}
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+
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+/******************************************************************************
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+ * FunctionName : i2c_sw_master_readByte
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+ * Description : read Byte from i2c bus
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+ * Parameters : NONE
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+ * Returns : uint8_t - readed value
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+*******************************************************************************/
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+uint8_t i2c_sw_master_readByte(void)
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+{
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+ uint8_t retVal = 0;
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+ uint8_t k, i;
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+
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+ i2c_sw_master_wait(5);
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+ i2c_sw_master_setDC(m_nLastSDA, 0);
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+ i2c_sw_master_wait(5); // sda 1, scl 0
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+
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+ for (i = 0; i < 8; i++) {
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+ i2c_sw_master_wait(5);
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+ i2c_sw_master_setDC(1, 0);
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+ i2c_sw_master_wait(5); // sda 1, scl 0
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+ i2c_sw_master_setDC(1, 1);
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+ i2c_sw_master_wait(5); // sda 1, scl 1
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+
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+ k = i2c_sw_master_getDC();
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+ i2c_sw_master_wait(5);
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+
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+ if (i == 7) {
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+ i2c_sw_master_wait(3);
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+ }
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+
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+ k <<= (7 - i);
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+ retVal |= k;
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+ }
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+
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+ i2c_sw_master_setDC(1, 0);
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+ i2c_sw_master_wait(5); // sda 1, scl 0
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+
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+ return retVal;
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+}
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+
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+/******************************************************************************
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+ * FunctionName : i2c_sw_master_writeByte
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+ * Description : write wrdata value(one byte) into i2c
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+ * Parameters : uint8_t wrdata - write value
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+ * Returns : NONE
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+*******************************************************************************/
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+void i2c_sw_master_writeByte(uint8_t wrdata)
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+{
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+ uint8_t dat;
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+ int8_t i;
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+
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+ i2c_sw_master_wait(5);
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+
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+ i2c_sw_master_setDC(m_nLastSDA, 0);
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+ i2c_sw_master_wait(5);
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+
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+ for (i = 7; i >= 0; i--) {
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+ dat = wrdata >> i;
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+ i2c_sw_master_setDC(dat, 0);
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+ i2c_sw_master_wait(5);
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+ i2c_sw_master_setDC(dat, 1);
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+ i2c_sw_master_wait(5);
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+
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+ if (i == 0) {
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+ i2c_sw_master_wait(3);
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+ }
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+
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+ i2c_sw_master_setDC(dat, 0);
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+ i2c_sw_master_wait(5);
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+ }
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+}
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