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Merge branch 'contrib/github_pr_7144_v4.4' into 'release/v4.4'

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Update i2c.c to consider two I2C buses for clear bus counter (GitHub PR) (backport v4.4)

See merge request espressif/esp-idf!20505
This commit is contained in:
morris 2022-11-17 16:35:50 +08:00
commit a54467fcfb
1 changed files with 9 additions and 7 deletions
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16
components/driver/i2c.c
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@ -1417,6 +1417,8 @@ static bool is_cmd_link_buffer_internal(const i2c_cmd_link_t *link)
}
#endif
static uint8_t clear_bus_cnt[I2C_NUM_MAX] = { 0 };
esp_err_t i2c_master_cmd_begin(i2c_port_t i2c_num, i2c_cmd_handle_t cmd_handle, TickType_t ticks_to_wait)
{
ESP_RETURN_ON_FALSE(( i2c_num < I2C_NUM_MAX ), ESP_ERR_INVALID_ARG, I2C_TAG, I2C_NUM_ERROR_STR);
@ -1434,7 +1436,6 @@ esp_err_t i2c_master_cmd_begin(i2c_port_t i2c_num, i2c_cmd_handle_t cmd_handle,
}
#endif
// Sometimes when the FSM get stuck, the ACK_ERR interrupt will occur endlessly until we reset the FSM and clear bus.
static uint8_t clear_bus_cnt = 0;
esp_err_t ret = ESP_FAIL;
i2c_obj_t *p_i2c = p_i2c_obj[i2c_num];
portTickType ticks_start = xTaskGetTickCount();
@ -1449,7 +1450,7 @@ esp_err_t i2c_master_cmd_begin(i2c_port_t i2c_num, i2c_cmd_handle_t cmd_handle,
if (p_i2c->status == I2C_STATUS_TIMEOUT
|| i2c_hal_is_bus_busy(&(i2c_context[i2c_num].hal))) {
i2c_hw_fsm_reset(i2c_num);
clear_bus_cnt = 0;
clear_bus_cnt[i2c_num] = 0;
}
i2c_reset_tx_fifo(i2c_num);
i2c_reset_rx_fifo(i2c_num);
@ -1495,12 +1496,13 @@ esp_err_t i2c_master_cmd_begin(i2c_port_t i2c_num, i2c_cmd_handle_t cmd_handle,
// If the I2C slave are powered off or the SDA/SCL are connected to ground, for example,
// I2C hw FSM would get stuck in wrong state, we have to reset the I2C module in this case.
i2c_hw_fsm_reset(i2c_num);
clear_bus_cnt = 0;
clear_bus_cnt[i2c_num] = 0;
ret = ESP_ERR_TIMEOUT;
} else if (p_i2c->status == I2C_STATUS_ACK_ERROR) {
clear_bus_cnt++;
if (clear_bus_cnt >= I2C_ACKERR_CNT_MAX) {
clear_bus_cnt = 0;
clear_bus_cnt[i2c_num]++;
if (clear_bus_cnt[i2c_num] >= I2C_ACKERR_CNT_MAX) {
clear_bus_cnt[i2c_num] = 0;
i2c_hw_fsm_reset(i2c_num);
}
ret = ESP_FAIL;
} else {
@ -1515,7 +1517,7 @@ esp_err_t i2c_master_cmd_begin(i2c_port_t i2c_num, i2c_cmd_handle_t cmd_handle,
// If the I2C slave are powered off or the SDA/SCL are connected to ground, for example,
// I2C hw FSM would get stuck in wrong state, we have to reset the I2C module in this case.
i2c_hw_fsm_reset(i2c_num);
clear_bus_cnt = 0;
clear_bus_cnt[i2c_num] = 0;
break;
}
}