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driver(i2c): enable I2C master hardware filter by default.

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This commit is contained in:
kooho 2018-11-15 20:21:49 +08:00
parent e199587a11
commit 33138a3dec
2 changed files with 55 additions and 1 deletions
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27
components/driver/i2c.c
View File

@ -79,6 +79,7 @@ static DRAM_ATTR i2c_dev_t* const I2C[I2C_NUM_MAX] = { &I2C0, &I2C1 };
#define I2C_SLAVE_SDA_HOLD_DEFAULT (10) /* I2C slave hold time after scl negative edge default value */
#define I2C_MASTER_TOUT_CNUM_DEFAULT (8) /* I2C master timeout cycle number of I2C clock, after which the timeout interrupt will be triggered */
#define I2C_ACKERR_CNT_MAX (10)
#define I2C_FILTER_CYC_NUM_DEF (7) /* The number of apb cycles filtered by default*/
typedef struct {
uint8_t byte_num; /*!< cmd byte number */
@ -660,6 +661,8 @@ esp_err_t i2c_param_config(i2c_port_t i2c_num, const i2c_config_t* i2c_conf)
//set timing for stop signal
I2C[i2c_num]->scl_stop_hold.time = half_cycle;
I2C[i2c_num]->scl_stop_setup.time = half_cycle;
//Default, we enable hardware filter
i2c_filter_enable(i2c_num, I2C_FILTER_CYC_NUM_DEF);
}
I2C_EXIT_CRITICAL(&i2c_spinlock[i2c_num]);
@ -693,6 +696,28 @@ esp_err_t i2c_get_period(i2c_port_t i2c_num, int* high_period, int* low_period)
return ESP_OK;
}
esp_err_t i2c_filter_enable(i2c_port_t i2c_num, uint8_t cyc_num)
{
I2C_CHECK(i2c_num < I2C_NUM_MAX, I2C_NUM_ERROR_STR, ESP_ERR_INVALID_ARG);
I2C_ENTER_CRITICAL(&i2c_spinlock[i2c_num]);
I2C[i2c_num]->scl_filter_cfg.thres = cyc_num;
I2C[i2c_num]->sda_filter_cfg.thres = cyc_num;
I2C[i2c_num]->scl_filter_cfg.en = 1;
I2C[i2c_num]->sda_filter_cfg.en = 1;
I2C_EXIT_CRITICAL(&i2c_spinlock[i2c_num]);
return ESP_OK;
}
esp_err_t i2c_filter_disable(i2c_port_t i2c_num)
{
I2C_CHECK(i2c_num < I2C_NUM_MAX, I2C_NUM_ERROR_STR, ESP_ERR_INVALID_ARG);
I2C_ENTER_CRITICAL(&i2c_spinlock[i2c_num]);
I2C[i2c_num]->scl_filter_cfg.en = 0;
I2C[i2c_num]->sda_filter_cfg.en = 0;
I2C_EXIT_CRITICAL(&i2c_spinlock[i2c_num]);
return ESP_OK;
}
esp_err_t i2c_set_start_timing(i2c_port_t i2c_num, int setup_time, int hold_time)
{
I2C_CHECK(i2c_num < I2C_NUM_MAX, I2C_NUM_ERROR_STR, ESP_ERR_INVALID_ARG);
@ -1375,4 +1400,4 @@ int i2c_slave_read_buffer(i2c_port_t i2c_num, uint8_t* data, size_t max_size, Ti
}
xSemaphoreGive(p_i2c->slv_rx_mux);
return cnt;
}
}

29
components/driver/include/driver/i2c.h
View File

@ -420,6 +420,35 @@ esp_err_t i2c_set_period(i2c_port_t i2c_num, int high_period, int low_period);
*/
esp_err_t i2c_get_period(i2c_port_t i2c_num, int* high_period, int* low_period);
/**
* @brief enable hardware filter on I2C bus
* Sometimes the I2C bus is disturbed by high frequency noise(about 20ns), or the rising edge of
* the SCL clock is very slow, these may cause the master state machine broken. enable hardware
* filter can filter out high frequency interference and make the master more stable.
* @note
* Enable filter will slow the SCL clock.
*
* @param i2c_num I2C port number
* @param cyc_num the APB cycles need to be filtered(0<= cyc_num <=7).
* When the period of a pulse is less than cyc_num * APB_cycle, the I2C controller will ignore this pulse.
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*/
esp_err_t i2c_filter_enable(i2c_port_t i2c_num, uint8_t cyc_num);
/**
* @brief disable filter on I2C bus
*
* @param i2c_num I2C port number
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*/
esp_err_t i2c_filter_disable(i2c_port_t i2c_num);
/**
* @brief set I2C master start signal timing
*