514 lines
17 KiB
C
514 lines
17 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#ifndef _DRIVER_I2C_H_
|
|
#define _DRIVER_I2C_H_
|
|
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
#include <esp_types.h>
|
|
#include "esp_err.h"
|
|
#include "esp_intr_alloc.h"
|
|
#include "freertos/FreeRTOS.h"
|
|
#include "freertos/semphr.h"
|
|
#include "freertos/xtensa_api.h"
|
|
#include "freertos/task.h"
|
|
#include "freertos/queue.h"
|
|
#include "freertos/ringbuf.h"
|
|
#include "driver/gpio.h"
|
|
|
|
#define I2C_APB_CLK_FREQ APB_CLK_FREQ /*!< I2C source clock is APB clock, 80MHz */
|
|
#define I2C_FIFO_LEN (32) /*!< I2C hardware fifo length */
|
|
typedef enum{
|
|
I2C_MODE_SLAVE = 0, /*!< I2C slave mode */
|
|
I2C_MODE_MASTER, /*!< I2C master mode */
|
|
I2C_MODE_MAX,
|
|
}i2c_mode_t;
|
|
|
|
typedef enum {
|
|
I2C_MASTER_WRITE = 0, /*!< I2C write data */
|
|
I2C_MASTER_READ, /*!< I2C read data */
|
|
} i2c_rw_t;
|
|
|
|
typedef enum {
|
|
I2C_DATA_MODE_MSB_FIRST = 0, /*!< I2C data msb first */
|
|
I2C_DATA_MODE_LSB_FIRST = 1, /*!< I2C data lsb first */
|
|
I2C_DATA_MODE_MAX
|
|
} i2c_trans_mode_t;
|
|
|
|
typedef enum{
|
|
I2C_CMD_RESTART = 0, /*!<I2C restart command */
|
|
I2C_CMD_WRITE, /*!<I2C write command */
|
|
I2C_CMD_READ, /*!<I2C read command */
|
|
I2C_CMD_STOP, /*!<I2C stop command */
|
|
I2C_CMD_END /*!<I2C end command */
|
|
}i2c_opmode_t;
|
|
|
|
typedef enum{
|
|
I2C_NUM_0 = 0, /*!< I2C port 0 */
|
|
I2C_NUM_1 , /*!< I2C port 1 */
|
|
I2C_NUM_MAX
|
|
} i2c_port_t;
|
|
|
|
typedef enum {
|
|
I2C_ADDR_BIT_7 = 0, /*!< I2C 7bit address for slave mode */
|
|
I2C_ADDR_BIT_10, /*!< I2C 10bit address for slave mode */
|
|
I2C_ADDR_BIT_MAX,
|
|
} i2c_addr_mode_t;
|
|
|
|
/**
|
|
* @brief I2C initialization parameters
|
|
*/
|
|
typedef struct{
|
|
i2c_mode_t mode; /*!< I2C mode */
|
|
gpio_num_t sda_io_num; /*!< GPIO number for I2C sda signal */
|
|
gpio_pullup_t sda_pullup_en; /*!< Internal GPIO pull mode for I2C sda signal*/
|
|
gpio_num_t scl_io_num; /*!< GPIO number for I2C scl signal */
|
|
gpio_pullup_t scl_pullup_en; /*!< Internal GPIO pull mode for I2C scl signal*/
|
|
|
|
union {
|
|
struct {
|
|
uint32_t clk_speed; /*!< I2C clock frequency for master mode, (no higher than 1MHz for now) */
|
|
} master;
|
|
struct {
|
|
uint8_t addr_10bit_en; /*!< I2C 10bit address mode enable for slave mode */
|
|
uint16_t slave_addr; /*!< I2C address for slave mode */
|
|
} slave;
|
|
|
|
};
|
|
}i2c_config_t;
|
|
|
|
typedef void* i2c_cmd_handle_t; /*!< I2C command handle */
|
|
|
|
/**
|
|
* @brief I2C driver install
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param mode I2C mode( master or slave )
|
|
* @param slv_rx_buf_len receiving buffer size for slave mode
|
|
* @note
|
|
* Only slave mode will use this value, driver will ignore this value in master mode.
|
|
* @param slv_tx_buf_len sending buffer size for slave mode
|
|
* @note
|
|
* Only slave mode will use this value, driver will ignore this value in master mode.
|
|
* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
|
|
* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
* - ESP_FAIL Driver install error
|
|
*/
|
|
esp_err_t i2c_driver_install(i2c_port_t i2c_num, i2c_mode_t mode, size_t slv_rx_buf_len, size_t slv_tx_buf_len, int intr_alloc_flags);
|
|
|
|
/**
|
|
* @brief I2C driver delete
|
|
*
|
|
* @param i2c_num I2C port number
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_driver_delete(i2c_port_t i2c_num);
|
|
|
|
/**
|
|
* @brief I2C parameter initialization
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param i2c_conf pointer to I2C parameter settings
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_param_config(i2c_port_t i2c_num, i2c_config_t* i2c_conf);
|
|
|
|
/**
|
|
* @brief reset I2C tx hardware fifo
|
|
*
|
|
* @param i2c_num I2C port number
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_reset_tx_fifo(i2c_port_t i2c_num);
|
|
|
|
/**
|
|
* @brief reset I2C rx fifo
|
|
*
|
|
* @param i2c_num I2C port number
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_reset_rx_fifo(i2c_port_t i2c_num);
|
|
|
|
/**
|
|
* @brief I2C isr handler register
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param fn isr handler function
|
|
* @param arg parameter for isr handler function
|
|
* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
|
|
* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
|
|
* @param handle handle return from esp_intr_alloc.
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_isr_register(i2c_port_t i2c_num, void (*fn)(void*), void * arg, int intr_alloc_flags, intr_handle_t *handle);
|
|
|
|
/**
|
|
* @brief to delete and free I2C isr.
|
|
*
|
|
* @param handle handle of isr.
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_isr_free(intr_handle_t handle);
|
|
|
|
/**
|
|
* @brief Configure GPIO signal for I2C sck and sda
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param sda_io_num GPIO number for I2C sda signal
|
|
* @param scl_io_num GPIO number for I2C scl signal
|
|
* @param sda_pullup_en Whether to enable the internal pullup for sda pin
|
|
* @param scl_pullup_en Whether to enable the internal pullup for scl pin
|
|
* @param mode I2C mode
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_set_pin(i2c_port_t i2c_num, gpio_num_t sda_io_num, gpio_num_t scl_io_num,
|
|
gpio_pullup_t sda_pullup_en, gpio_pullup_t scl_pullup_en, i2c_mode_t mode);
|
|
|
|
/**
|
|
* @brief Create and init I2C command link
|
|
* @note
|
|
* Before we build I2C command link, we need to call i2c_cmd_link_create() to create
|
|
* a command link.
|
|
* After we finish sending the commands, we need to call i2c_cmd_link_delete() to
|
|
* release and return the resources.
|
|
*
|
|
* @return i2c command link handler
|
|
*/
|
|
i2c_cmd_handle_t i2c_cmd_link_create();
|
|
|
|
/**
|
|
* @brief Free I2C command link
|
|
* @note
|
|
* Before we build I2C command link, we need to call i2c_cmd_link_create() to create
|
|
* a command link.
|
|
* After we finish sending the commands, we need to call i2c_cmd_link_delete() to
|
|
* release and return the resources.
|
|
*
|
|
* @param cmd_handle I2C command handle
|
|
*/
|
|
void i2c_cmd_link_delete(i2c_cmd_handle_t cmd_handle);
|
|
|
|
/**
|
|
* @brief Queue command for I2C master to generate a start signal
|
|
* @note
|
|
* Only call this function in I2C master mode
|
|
* Call i2c_master_cmd_begin() to send all queued commands
|
|
*
|
|
* @param cmd_handle I2C cmd link
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_master_start(i2c_cmd_handle_t cmd_handle);
|
|
|
|
/**
|
|
* @brief Queue command for I2C master to write one byte to I2C bus
|
|
* @note
|
|
* Only call this function in I2C master mode
|
|
* Call i2c_master_cmd_begin() to send all queued commands
|
|
*
|
|
* @param cmd_handle I2C cmd link
|
|
* @param data I2C one byte command to write to bus
|
|
* @param ack_en enable ack check for master
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_master_write_byte(i2c_cmd_handle_t cmd_handle, uint8_t data, bool ack_en);
|
|
|
|
/**
|
|
* @brief Queue command for I2C master to write buffer to I2C bus
|
|
* @note
|
|
* Only call this function in I2C master mode
|
|
* Call i2c_master_cmd_begin() to send all queued commands
|
|
*
|
|
* @param cmd_handle I2C cmd link
|
|
* @param data data to send
|
|
* @param data_len data length
|
|
* @param ack_en enable ack check for master
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_master_write(i2c_cmd_handle_t cmd_handle, uint8_t* data, size_t data_len, bool ack_en);
|
|
|
|
/**
|
|
* @brief Queue command for I2C master to read one byte from I2C bus
|
|
* @note
|
|
* Only call this function in I2C master mode
|
|
* Call i2c_master_cmd_begin() to send all queued commands
|
|
*
|
|
* @param cmd_handle I2C cmd link
|
|
* @param data pointer accept the data byte
|
|
* @param ack ack value for read command
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_master_read_byte(i2c_cmd_handle_t cmd_handle, uint8_t* data, int ack);
|
|
|
|
/**
|
|
* @brief Queue command for I2C master to read data from I2C bus
|
|
* @note
|
|
* Only call this function in I2C master mode
|
|
* Call i2c_master_cmd_begin() to send all queued commands
|
|
*
|
|
* @param cmd_handle I2C cmd link
|
|
* @param data data buffer to accept the data from bus
|
|
* @param data_len read data length
|
|
* @param ack ack value for read command
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_master_read(i2c_cmd_handle_t cmd_handle, uint8_t* data, size_t data_len, int ack);
|
|
|
|
/**
|
|
* @brief Queue command for I2C master to generate a stop signal
|
|
* @note
|
|
* Only call this function in I2C master mode
|
|
* Call i2c_master_cmd_begin() to send all queued commands
|
|
*
|
|
* @param cmd_handle I2C cmd link
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_master_stop(i2c_cmd_handle_t cmd_handle);
|
|
|
|
/**
|
|
* @brief I2C master send queued commands.
|
|
* This function will trigger sending all queued commands.
|
|
* The task will be blocked until all the commands have been sent out.
|
|
* The I2C APIs are not thread-safe, if you want to use one I2C port in different tasks,
|
|
* you need to take care of the multi-thread issue.
|
|
* @note
|
|
* Only call this function in I2C master mode
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param cmd_handle I2C command handler
|
|
* @param ticks_to_wait maximum wait ticks.
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
* - ESP_FAIL Sending command error, slave doesn't ACK the transfer.
|
|
* - ESP_ERR_INVALID_STATE I2C driver not installed or not in master mode.
|
|
* - ESP_ERR_TIMEOUT Operation timeout because the bus is busy.
|
|
*/
|
|
esp_err_t i2c_master_cmd_begin(i2c_port_t i2c_num, i2c_cmd_handle_t cmd_handle, portBASE_TYPE ticks_to_wait);
|
|
|
|
/**
|
|
* @brief I2C slave write data to internal ringbuffer, when tx fifo empty, isr will fill the hardware
|
|
* fifo from the internal ringbuffer
|
|
* @note
|
|
* Only call this function in I2C slave mode
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param data data pointer to write into internal buffer
|
|
* @param size data size
|
|
* @param ticks_to_wait Maximum waiting ticks
|
|
*
|
|
* @return
|
|
* - ESP_FAIL(-1) Parameter error
|
|
* - Others(>=0) The number of data bytes that pushed to the I2C slave buffer.
|
|
*/
|
|
int i2c_slave_write_buffer(i2c_port_t i2c_num, uint8_t* data, int size, portBASE_TYPE ticks_to_wait);
|
|
|
|
/**
|
|
* @brief I2C slave read data from internal buffer. When I2C slave receive data, isr will copy received data
|
|
* from hardware rx fifo to internal ringbuffer. Then users can read from internal ringbuffer.
|
|
* @note
|
|
* Only call this function in I2C slave mode
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param data data pointer to write into internal buffer
|
|
* @param max_size Maximum data size to read
|
|
* @param ticks_to_wait Maximum waiting ticks
|
|
*
|
|
* @return
|
|
* - ESP_FAIL(-1) Parameter error
|
|
* - Others(>=0) The number of data bytes that read from I2C slave buffer.
|
|
*/
|
|
int i2c_slave_read_buffer(i2c_port_t i2c_num, uint8_t* data, size_t max_size, portBASE_TYPE ticks_to_wait);
|
|
|
|
/**
|
|
* @brief set I2C master clock period
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param high_period clock cycle number during SCL is high level, high_period is a 14 bit value
|
|
* @param low_period clock cycle number during SCL is low level, low_period is a 14 bit value
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_set_period(i2c_port_t i2c_num, int high_period, int low_period);
|
|
|
|
/**
|
|
* @brief get I2C master clock period
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param high_period pointer to get clock cycle number during SCL is high level, will get a 14 bit value
|
|
* @param low_period pointer to get clock cycle number during SCL is low level, will get a 14 bit value
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_get_period(i2c_port_t i2c_num, int* high_period, int* low_period);
|
|
|
|
/**
|
|
* @brief set I2C master start signal timing
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param setup_time clock number between the falling-edge of SDA and rising-edge of SCL for start mark, it's a 10-bit value.
|
|
* @param hold_time clock num between the falling-edge of SDA and falling-edge of SCL for start mark, it's a 10-bit value.
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_set_start_timing(i2c_port_t i2c_num, int setup_time, int hold_time);
|
|
|
|
/**
|
|
* @brief get I2C master start signal timing
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param setup_time pointer to get setup time
|
|
* @param hold_time pointer to get hold time
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_get_start_timing(i2c_port_t i2c_num, int* setup_time, int* hold_time);
|
|
|
|
/**
|
|
* @brief set I2C master stop signal timing
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param setup_time clock num between the rising-edge of SCL and the rising-edge of SDA, it's a 10-bit value.
|
|
* @param hold_time clock number after the STOP bit's rising-edge, it's a 14-bit value.
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_set_stop_timing(i2c_port_t i2c_num, int setup_time, int hold_time);
|
|
|
|
/**
|
|
* @brief get I2C master stop signal timing
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param setup_time pointer to get setup time.
|
|
* @param hold_time pointer to get hold time.
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_get_stop_timing(i2c_port_t i2c_num, int* setup_time, int* hold_time);
|
|
|
|
/**
|
|
* @brief set I2C data signal timing
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param sample_time clock number I2C used to sample data on SDA after the rising-edge of SCL, it's a 10-bit value
|
|
* @param hold_time clock number I2C used to hold the data after the falling-edge of SCL, it's a 10-bit value
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_set_data_timing(i2c_port_t i2c_num, int sample_time, int hold_time);
|
|
|
|
/**
|
|
* @brief get I2C data signal timing
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param sample_time pointer to get sample time
|
|
* @param hold_time pointer to get hold time
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_get_data_timing(i2c_port_t i2c_num, int* sample_time, int* hold_time);
|
|
|
|
/**
|
|
* @brief set I2C data transfer mode
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param tx_trans_mode I2C sending data mode
|
|
* @param rx_trans_mode I2C receving data mode
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_set_data_mode(i2c_port_t i2c_num, i2c_trans_mode_t tx_trans_mode, i2c_trans_mode_t rx_trans_mode);
|
|
|
|
/**
|
|
* @brief get I2C data transfer mode
|
|
*
|
|
* @param i2c_num I2C port number
|
|
* @param tx_trans_mode pointer to get I2C sending data mode
|
|
* @param rx_trans_mode pointer to get I2C receiving data mode
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t i2c_get_data_mode(i2c_port_t i2c_num, i2c_trans_mode_t *tx_trans_mode, i2c_trans_mode_t *rx_trans_mode);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /*_DRIVER_I2C_H_*/
|