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add NACK for the last byte to read

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This commit is contained in:
kooho 2017-11-21 21:10:17 +08:00
parent 5401a75bad
commit d78be97154
2 changed files with 38 additions and 8 deletions
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35
components/driver/i2c.c
View File

@ -65,6 +65,8 @@ static DRAM_ATTR i2c_dev_t* const I2C[I2C_NUM_MAX] = { &I2C0, &I2C1 };
#define I2C_SCL_IO_ERR_STR "scl gpio number error"
#define I2C_CMD_LINK_INIT_ERR_STR "i2c command link error"
#define I2C_GPIO_PULLUP_ERR_STR "this i2c pin does not support internal pull-up"
#define I2C_ACK_TYPE_ERR_STR "i2c ack type error"
#define I2C_DATA_LEN_ERR_STR "i2c data read length error"
#define I2C_FIFO_FULL_THRESH_VAL (28)
#define I2C_FIFO_EMPTY_THRESH_VAL (5)
#define I2C_IO_INIT_LEVEL (1)
@ -958,11 +960,8 @@ esp_err_t i2c_master_write_byte(i2c_cmd_handle_t cmd_handle, uint8_t data, bool
return i2c_cmd_link_append(cmd_handle, &cmd);
}
esp_err_t i2c_master_read(i2c_cmd_handle_t cmd_handle, uint8_t* data, size_t data_len, int ack)
static esp_err_t i2c_master_read_static(i2c_cmd_handle_t cmd_handle, uint8_t* data, size_t data_len, i2c_ack_type_t ack)
{
I2C_CHECK((data != NULL), I2C_ADDR_ERROR_STR, ESP_ERR_INVALID_ARG);
I2C_CHECK(cmd_handle != NULL, I2C_CMD_LINK_INIT_ERR_STR, ESP_ERR_INVALID_ARG);
int len_tmp;
int data_offset = 0;
esp_err_t ret;
@ -985,20 +984,44 @@ esp_err_t i2c_master_read(i2c_cmd_handle_t cmd_handle, uint8_t* data, size_t dat
return ESP_OK;
}
esp_err_t i2c_master_read_byte(i2c_cmd_handle_t cmd_handle, uint8_t* data, int ack)
esp_err_t i2c_master_read_byte(i2c_cmd_handle_t cmd_handle, uint8_t* data, i2c_ack_type_t ack)
{
I2C_CHECK((data != NULL), I2C_ADDR_ERROR_STR, ESP_ERR_INVALID_ARG);
I2C_CHECK(cmd_handle != NULL, I2C_CMD_LINK_INIT_ERR_STR, ESP_ERR_INVALID_ARG);
I2C_CHECK(ack < I2C_MASTER_ACK_MAX, I2C_ACK_TYPE_ERR_STR, ESP_ERR_INVALID_ARG);
i2c_cmd_t cmd;
cmd.ack_en = 0;
cmd.ack_exp = 0;
cmd.ack_val = ack & 0x1;
cmd.ack_val = ((ack == I2C_MASTER_LAST_NACK) ? I2C_MASTER_NACK : (ack & 0x1));
cmd.byte_num = 1;
cmd.op_code = I2C_CMD_READ;
cmd.data = data;
return i2c_cmd_link_append(cmd_handle, &cmd);
}
esp_err_t i2c_master_read(i2c_cmd_handle_t cmd_handle, uint8_t* data, size_t data_len, i2c_ack_type_t ack)
{
I2C_CHECK((data != NULL), I2C_ADDR_ERROR_STR, ESP_ERR_INVALID_ARG);
I2C_CHECK(cmd_handle != NULL, I2C_CMD_LINK_INIT_ERR_STR, ESP_ERR_INVALID_ARG);
I2C_CHECK(ack < I2C_MASTER_ACK_MAX, I2C_ACK_TYPE_ERR_STR, ESP_ERR_INVALID_ARG);
I2C_CHECK(data_len < 1, I2C_DATA_LEN_ERR_STR, ESP_ERR_INVALID_ARG);
if(ack != I2C_MASTER_LAST_NACK) {
return i2c_master_read_static(cmd_handle, data, data_len, ack);
} else {
if(data_len == 1) {
return i2c_master_read_byte(cmd_handle, data, I2C_MASTER_NACK);
} else {
esp_err_t ret;
if((ret = i2c_master_read_static(cmd_handle, data, data_len - 1, I2C_MASTER_ACK)) != ESP_OK) {
return ret;
}
return i2c_master_read_byte(cmd_handle, data + data_len - 1, I2C_MASTER_NACK);
}
}
}
static void IRAM_ATTR i2c_master_cmd_begin_static(i2c_port_t i2c_num)
{
i2c_obj_t* p_i2c = p_i2c_obj[i2c_num];

11
components/driver/include/driver/i2c.h
View File

@ -69,6 +69,13 @@ typedef enum {
I2C_ADDR_BIT_MAX,
} i2c_addr_mode_t;
typedef enum {
I2C_MASTER_ACK = 0x0, /*!< I2C ack for each byte read */
I2C_MASTER_NACK = 0x1, /*!< I2C nack for each byte read */
I2C_MASTER_LAST_NACK = 0x2, /*!< I2C nack for the last byte*/
I2C_MASTER_ACK_MAX,
} i2c_ack_type_t;
/**
* @brief I2C initialization parameters
*/
@ -288,7 +295,7 @@ esp_err_t i2c_master_write(i2c_cmd_handle_t cmd_handle, uint8_t* data, size_t da
* - 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);
esp_err_t i2c_master_read_byte(i2c_cmd_handle_t cmd_handle, uint8_t* data, i2c_ack_type_t ack);
/**
* @brief Queue command for I2C master to read data from I2C bus
@ -305,7 +312,7 @@ esp_err_t i2c_master_read_byte(i2c_cmd_handle_t cmd_handle, uint8_t* data, int a
* - 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);
esp_err_t i2c_master_read(i2c_cmd_handle_t cmd_handle, uint8_t* data, size_t data_len, i2c_ack_type_t ack);
/**
* @brief Queue command for I2C master to generate a stop signal