并行 IO RX 驱动程序

[English]

简介

并行 IO RX 单元通常支持以下场景：

  • 用于高速数据采集，如摄像头、传感器数据读取

  • 作为从机与其他主机进行高速并行通信

应用示例

  • peripherals/parlio/parlio_rx/logic_analyzer 演示了如何使用并行 IO RX 外设来实现逻辑分析仪。该分析仪可以以高频率并行采样多个 GPIO 上的数据，还可以探测内部或外部信号，并将原始采样数据保存至 Flash 中或者输出到 TCP 流。

API 参考

Header File

  • components/esp_driver_parlio/include/driver/parlio_rx.h

  • This header file can be included with:

    #include "driver/parlio_rx.h"

  • This header file is a part of the API provided by the esp_driver_parlio component. To declare that your component depends on esp_driver_parlio, add the following to your CMakeLists.txt:

    REQUIRES esp_driver_parlio

    or

    PRIV_REQUIRES esp_driver_parlio

Functions

esp_err_t parlio_new_rx_unit(const parlio_rx_unit_config_t *config, parlio_rx_unit_handle_t *ret_unit)

Create a Parallel IO RX unit.

参数:

  • config -- [in] Parallel IO RX unit configuration

  • ret_unit -- [out] Returned Parallel IO RX unit handle

返回:

  • ESP_ERR_INVALID_ARG Invalid arguments in the parameter list or the rx unit configuration

  • ESP_ERR_NOT_FOUND No available rx unit found

  • ESP_ERR_NO_MEM No enough memory for the rx unit resources

  • ESP_OK Success to allocate the rx unit

esp_err_t parlio_del_rx_unit(parlio_rx_unit_handle_t rx_unit)

Delete a Parallel IO RX unit.

参数:

rx_unit -- [in] Parallel IO RX unit handle that created by parlio_new_rx_unit

返回:

  • ESP_ERR_INVALID_ARG rx_unit is NULL

  • ESP_ERR_INVALID_STATE The rx unit is enabled, can't delete an enabled rx unit

  • ESP_OK Success to delete the rx unit

esp_err_t parlio_new_rx_level_delimiter(const parlio_rx_level_delimiter_config_t *config, parlio_rx_delimiter_handle_t *ret_delimiter)

Create a level delimiter.

备注

This function only allocate the software resources, the hardware configurations will lazy installed while the transaction that using this delimiter start processing

备注

The enable signal must be aligned with the valid data.

备注

There're at most SOC_PARLIO_RX_UNIT_MAX_DATA_WIDTH - 1 IO pins left for RXD

参数:

  • config -- [in] Level delimiter configuration

  • ret_delimiter -- [out] Returned delimiter handle

返回:

  • ESP_ERR_INVALID_ARG Invalid arguments in the parameter list or the level delimiter configuration

  • ESP_ERR_NO_MEM No enough memory for the level delimiter resources

  • ESP_OK Success to allocate the level delimiter

esp_err_t parlio_new_rx_pulse_delimiter(const parlio_rx_pulse_delimiter_config_t *config, parlio_rx_delimiter_handle_t *ret_delimiter)

Create a pulse delimiter.

备注

This function only allocate the software resources, the hardware configurations will lazy installed while the transaction that using this delimiter start processing

备注

There're at most SOC_PARLIO_RX_UNIT_MAX_DATA_WIDTH - 1 IO pins left for RXD

参数:

  • config -- [in] Pulse delimiter configuration

  • ret_delimiter -- [out] Returned delimiter handle

返回:

  • ESP_ERR_INVALID_ARG Invalid arguments in the parameter list or the pulse delimiter configuration

  • ESP_ERR_NO_MEM No enough memory for the pulse delimiter resources

  • ESP_OK Success to allocate the pulse delimiter

esp_err_t parlio_new_rx_soft_delimiter(const parlio_rx_soft_delimiter_config_t *config, parlio_rx_delimiter_handle_t *ret_delimiter)

Create a pulse delimiter.

备注

This function only allocate the software resources, the hardware configurations will lazy installed while the transaction that using this delimiter start processing

参数:

  • config -- [in] Soft delimiter configuration

  • ret_delimiter -- [out] Returned delimiter handle

返回:

  • ESP_ERR_INVALID_ARG Invalid arguments in the parameter list or the soft delimiter configuration

  • ESP_ERR_NO_MEM No enough memory for the soft delimiter resources

  • ESP_OK Success to allocate the soft delimiter

esp_err_t parlio_rx_soft_delimiter_start_stop(parlio_rx_unit_handle_t rx_unit, parlio_rx_delimiter_handle_t delimiter, bool start_stop)

Start/stop the soft delimiter.

备注

Soft delimiter need to start or stop manually because it has no validating/enabling signal to indicate the data has started or stopped

参数:

  • rx_unit -- [in] Parallel IO RX unit handle that created by parlio_new_rx_unit

  • delimiter -- [in] Delimiter handle

  • start_stop -- [in] Set true to start, set false to stop

返回:

  • ESP_ERR_INVALID_ARG Invalid arguments in the parameter list or not soft delimiter

  • ESP_ERR_INVALID_STATE The rx unit not enabled

  • ESP_OK Success to start or stop the soft delimiter

esp_err_t parlio_del_rx_delimiter(parlio_rx_delimiter_handle_t delimiter)

Delete the delimiter.

备注

To delete the delimiter safely, please delete it after disable all the RX units

参数:

delimiter -- [in] Delimiter handle

返回:

  • ESP_ERR_INVALID_ARG The input delimiter is NULL

  • ESP_ERR_INVALID_STATE The delimiter is on receiving

  • ESP_OK Success to delete the delimiter

esp_err_t parlio_rx_unit_enable(parlio_rx_unit_handle_t rx_unit, bool reset_queue)

Enable the Parallel IO RX unit.

参数:

  • rx_unit -- [in] Parallel IO RX unit handle that created by parlio_new_rx_unit

  • reset_queue -- [in] Whether to reset the receiving queue. If set to false, the legacy receive transactions in the queue are still available, If set to true, the legacy receive transactions in the queue are dropped.

返回:

  • ESP_ERR_INVALID_ARG The input rx_unit is NULL

  • ESP_ERR_INVALID_STATE The rx unit has been enabled

  • ESP_OK Success to enable the rx unit

esp_err_t parlio_rx_unit_disable(parlio_rx_unit_handle_t rx_unit)

Disable the Parallel IO RX unit.

参数:

rx_unit -- [in] Parallel IO RX unit handle that created by parlio_new_rx_unit

返回:

  • ESP_ERR_INVALID_ARG The input rx_unit is NULL

  • ESP_ERR_INVALID_STATE The rx unit has been disabled

  • ESP_OK Success to disable the rx unit

esp_err_t parlio_rx_unit_receive(parlio_rx_unit_handle_t rx_unit, void *payload, size_t payload_size, const parlio_receive_config_t *recv_cfg)

Receive data by Parallel IO RX unit.

备注

This is a non-blocking and asynchronous function. To block or realize synchronous receive, please call parlio_rx_unit_wait_all_done after this function

备注

The receive transaction will start immediately when there is not other transaction on receiving, Otherwise it will be sent to the transaction queue to wait for the bus.

参数:

  • rx_unit -- [in] Parallel IO RX unit handle that created by parlio_new_rx_unit

  • payload -- [in] The payload buffer pointer

  • payload_size -- [in] The size of the payload buffer, in bytes.

  • recv_cfg -- [in] The configuration of this receive transaction

返回:

  • ESP_ERR_INVALID_ARG Invalid arguments in the parameter list or the receive configuration

  • ESP_ERR_NO_MEM No memory for the internal DMA buffer (only when parlio_receive_config_t::indirect_mount enabled)

  • ESP_ERR_INVALID_STATE Transaction queue is full, failed to queue the current transaction. Or the internal buffer is under using by an infinite transaction, can't allocate a new one

  • ESP_OK Success to queue the current receiving transaction

esp_err_t parlio_rx_unit_wait_all_done(parlio_rx_unit_handle_t rx_unit, int timeout_ms)

Wait for all pending RX transactions done.

备注

This function will block until all receiving transactions done or timeout. When timeout occurs, either the timeout limitation too short for all transactions done, or the peripheral got stuck and no more interrupts trigger (e.g., external clock stopped).

参数:

  • rx_unit -- [in] Parallel IO RX unit handle that created by parlio_new_rx_unit

  • timeout_ms -- [in] Timeout in milliseconds, -1 means to wait forever (software timeout)

返回:

  • ESP_ERR_INVALID_ARG The input rx_unit is NULL

  • ESP_ERR_TIMEOUT Wait for all transactions done timeout

  • ESP_OK All transaction done

esp_err_t parlio_rx_unit_register_event_callbacks(parlio_rx_unit_handle_t rx_unit, const parlio_rx_event_callbacks_t *cbs, void *user_data)

Register event callbacks for Parallel IO RX unit.

参数:

  • rx_unit -- [in] Parallel IO RX unit handle that created by parlio_new_rx_unit

  • cbs -- [in] Callback group, set callback to NULL to deregister the corresponding callback (callback group pointer shouldn't be NULL)

  • user_data -- [in] User specified data that will be transported to the callbacks

返回:

  • ESP_ERR_INVALID_ARG The input rx_unit is NULL

  • ESP_ERR_INVALID_STATE The rx unit has been enabled, callback should be registered before enabling the unit

  • ESP_OK Success to register the callbacks

Structures

struct parlio_rx_unit_config_t

Parallel IO RX unit configuration.

Public Members

size_t trans_queue_depth

Depth of internal transaction queue

size_t max_recv_size

Maximum receive size in one transaction, in bytes. This decides the number of DMA nodes will be used for each transaction

size_t data_width

Parallel IO data width, can set to 1/2/4/8/..., but can't be greater than PARLIO_RX_UNIT_MAX_DATA_WIDTH

parlio_clock_source_t clk_src

Parallel IO clock source

uint32_t ext_clk_freq_hz

The external source clock frequency. Only be valid when select PARLIO_CLK_SRC_EXTERNAL as clock source

uint32_t exp_clk_freq_hz

The expected sample/bit clock frequency, which is divided from the internal or external clock regarding the clock source

gpio_num_t clk_in_gpio_num

The the external clock input pin. Only be valid when select PARLIO_CLK_SRC_EXTERNAL as clock source. Set to -1 if not needed

gpio_num_t clk_out_gpio_num

The sample/bit clock output pin. Set to -1 if not needed

gpio_num_t valid_gpio_num

GPIO number of the valid signal. The signal on this pin is used to indicate whether the data on the data lines are valid. Only takes effect when using level or pulse delimiter, set to -1 if only use the soft delimiter

gpio_num_t data_gpio_nums[PARLIO_RX_UNIT_MAX_DATA_WIDTH]

Parallel IO data GPIO numbers, set to -1 if it's not used, The driver will take [0 .. (data_width - 1)] as the data pins

uint32_t free_clk

Whether the input external clock is a free-running clock. A free-running clock will always keep running (e.g. I2S bclk), a non-free-running clock will start when there are data transporting and stop when the bus idle (e.g. SPI). This flag only takes effect when select PARLIO_CLK_SRC_EXTERNAL as clock source

uint32_t clk_gate_en

Enable RX clock gating, only available when the clock direction is output(not supported on ESP32-C6) the output clock will be controlled by the valid gpio, i.e. high level of valid gpio to enable the clock output, low to disable

uint32_t io_loop_back

For debug/test, the signal output from the GPIO will be fed to the input path as well

uint32_t io_no_init

Deprecated. Driver won't change the GPIO configuration in inilization.

uint32_t allow_pd

Set to allow power down. When this flag set, the driver will backup/restore the PARLIO registers before/after entering/exist sleep mode. By this approach, the system can power off PARLIO's power domain. This can save power, but at the expense of more RAM being consumed.

struct parlio_rx_unit_config_t flags

RX driver flags

struct parlio_rx_level_delimiter_config_t

Configuration of level delimiter.

Public Members

uint32_t valid_sig_line_id

The data line id of valid/enable signal. The selected data line will be used as the valid/enable signal (i.e. level signal) in this delimiter. As the line of valid/enable signal is shared with the data line, this line_id will be conflict with the data line if set the id within 'data_width', therefore the range is (data_width, PARLIO_RX_UNIT_MAX_DATA_WIDTH].

parlio_sample_edge_t sample_edge

Parallel IO sample edge

parlio_bit_pack_order_t bit_pack_order

Set how we pack the bits into one bytes

uint32_t eof_data_len

Set the data length to trigger the End Of Frame (EOF, i.e. transaction done) interrupt, if the data length is set to 0, that mean the EOF will only triggers when the enable signal inactivated

uint32_t timeout_ticks

The number of source clock ticks to trigger timeout interrupt. Set 0 to disable the receive timeout interrupt The timeout counter starts when the valid/enable signal is invalid/disabled.

uint32_t active_low_en

Set true to set the valid signal active when the level is low, otherwise, the valid signal becomes active when its level is high

struct parlio_rx_level_delimiter_config_t flags

Extra flags

struct parlio_rx_pulse_delimiter_config_t

Configuration of pulse delimiter.

Public Members

uint32_t valid_sig_line_id

The data line id of valid/enable signal. The selected data line will be used as the valid/enable signal (i.e. pulse signal) in this delimiter. As the line of valid/enable signal is shared with the data line, this line_id will be conflict with the data line if set the id within 'data_width', therefore the range is (data_width, PARLIO_RX_UNIT_MAX_DATA_WIDTH].

parlio_sample_edge_t sample_edge

Parallel IO sample edge

parlio_bit_pack_order_t bit_pack_order

Set how we pack the bits into one bytes

uint32_t eof_data_len

Set the data length to trigger the End Of Frame (EOF, i.e. transaction done) interrupt, if the data length is set to 0, that mean the EOF will only triggers when the end pulse detected, please ensure there is an end pulse for a frame and has_end_pulse flag is set

uint32_t timeout_ticks

The number of source clock ticks to trigger timeout interrupt. Set 0 to disable the receive timeout interrupt The timeout counter starts when the valid/enable signal is invalid/disabled.

uint32_t start_bit_included

Whether data bit is included in the start pulse

uint32_t end_bit_included

Whether data bit is included in the end pulse, only valid when has_end_pulse is true

uint32_t has_end_pulse

Whether there's an end pulse to terminate the transaction, if no, the transaction will be terminated by user configured transaction length

uint32_t pulse_invert

Whether to invert the pulse

struct parlio_rx_pulse_delimiter_config_t flags

Extra flags

struct parlio_rx_soft_delimiter_config_t

Configuration of soft delimiter.

Public Members

parlio_sample_edge_t sample_edge

Parallel IO sample edge

parlio_bit_pack_order_t bit_pack_order

Set how we pack the bits into one bytes, set 1 to pack the bits into a byte from LSB, otherwise from MSB

uint32_t eof_data_len

Set the data length to trigger the End Of Frame (EOF, i.e. transaction done) interrupt, if the data length is set to 0, that mean the EOF will only triggers when the end pulse detected, please ensure there is an end pulse for a frame and parlio_rx_pulse_delimiter_config_t::has_end_pulse flag is set

uint32_t timeout_ticks

The number of APB clock ticks to trigger timeout interrupt. Set 0 to disable the receive timeout interrupt

struct parlio_receive_config_t

Configuration of a receive transaction.

Public Members

parlio_rx_delimiter_handle_t delimiter

The delimiter of this receiving transaction

uint32_t partial_rx_en

Whether this is an infinite transaction that supposed to receive continuously and partially

uint32_t indirect_mount

This flag only take effect when partial_rx_en is enabled. Enable this flag, an INTERNAL DMA buffer will be mounted to the DMA descriptor instead, The data will be copy to the payload in every interrupt. So that to guarantee the payload buffer is valid during the on_receive_done callback. Either partial_rx_en or indirect_mount is disabled, the user given finite payload will be mounted to the DMA descriptor directly. By default, the user given receive payload will be mounted to the DMA descriptor directly.

struct parlio_receive_config_t flags

Extra flags

struct parlio_rx_event_data_t

Event callback data.

Public Members

parlio_rx_delimiter_handle_t delimiter

The current delimiter of this receiving event

void *data

The data buffer address that just finished receiving

size_t recv_bytes

The number of received bytes in the data buffer

struct parlio_rx_event_callbacks_t

Parallel IO RX event callbacks.

Public Members

parlio_rx_callback_t on_partial_receive

Callback of received partial data

parlio_rx_callback_t on_receive_done

Callback of receiving transaction done

parlio_rx_callback_t on_timeout

Callback of hardware receiving timeout

Type Definitions

typedef bool (*parlio_rx_callback_t)(parlio_rx_unit_handle_t rx_unit, const parlio_rx_event_data_t *edata, void *user_data)

The template of the Parallel IO RX callback function.

Param rx_unit:

[in] Parallel IO RX unit handle that given from ISR

Param edata:

[in] The event data that given from ISR

Param user_data:

[in] The user specified data that given while registering the callbacks

Return:

  • True: to awoke high priority tasks

  • False: not to awoke high priority tasks

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