3387d751d9
Introduced in9c23b8e5and4f87a62f. To get higher speed, menuconfig options are added to put ISR and other functions into the IRAM. The interrupt flag ESP_INTR_FLAG_IRAM is also mistakenly set when the ISR is put into the IRAM. However callbacks, which are wrote by the user, are called in the master and slave ISR. The user may not be aware of that these callbacks are not disabled during flash operations. Any cache miss during flash operation will cause panic. Essentially IRAM functions and intrrupt flag ESP_INTR_FLAG_IRAM are different, the latter means not disabling the ISR during flash operations. New bus_config flag intr_flags is offered to help set the interrupt attribute, including priority level, SHARED, IRAM (not disabled during flash operations). It introduced a small BREAK to IDFv3.1 (but the same as IDFv3.0) that the user has to manually set IRAM flag now (therefore he's aware of the IRAM thing) to void the ISR being disabled during flash operations.
184 lines
8.8 KiB
C
184 lines
8.8 KiB
C
// Copyright 2010-2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef _DRIVER_SPI_SLAVE_H_
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#define _DRIVER_SPI_SLAVE_H_
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#include "esp_err.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/semphr.h"
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#include "driver/spi_common.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#define SPI_SLAVE_TXBIT_LSBFIRST (1<<0) ///< Transmit command/address/data LSB first instead of the default MSB first
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#define SPI_SLAVE_RXBIT_LSBFIRST (1<<1) ///< Receive data LSB first instead of the default MSB first
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#define SPI_SLAVE_BIT_LSBFIRST (SPI_SLAVE_TXBIT_LSBFIRST|SPI_SLAVE_RXBIT_LSBFIRST) ///< Transmit and receive LSB first
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typedef struct spi_slave_transaction_t spi_slave_transaction_t;
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typedef void(*slave_transaction_cb_t)(spi_slave_transaction_t *trans);
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/**
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* @brief This is a configuration for a SPI host acting as a slave device.
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*/
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typedef struct {
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int spics_io_num; ///< CS GPIO pin for this device
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uint32_t flags; ///< Bitwise OR of SPI_SLAVE_* flags
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int queue_size; ///< Transaction queue size. This sets how many transactions can be 'in the air' (queued using spi_slave_queue_trans but not yet finished using spi_slave_get_trans_result) at the same time
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uint8_t mode; ///< SPI mode (0-3)
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slave_transaction_cb_t post_setup_cb; /**< Callback called after the SPI registers are loaded with new data.
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*
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* This callback is called within interrupt
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* context should be in IRAM for best
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* performance, see "Transferring Speed"
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* section in the SPI Master documentation for
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* full details. If not, the callback may crash
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* during flash operation when the driver is
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* initialized with ESP_INTR_FLAG_IRAM.
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*/
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slave_transaction_cb_t post_trans_cb; /**< Callback called after a transaction is done.
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*
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* This callback is called within interrupt
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* context should be in IRAM for best
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* performance, see "Transferring Speed"
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* section in the SPI Master documentation for
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* full details. If not, the callback may crash
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* during flash operation when the driver is
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* initialized with ESP_INTR_FLAG_IRAM.
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*/
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} spi_slave_interface_config_t;
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/**
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* This structure describes one SPI transaction
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*/
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struct spi_slave_transaction_t {
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size_t length; ///< Total data length, in bits
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size_t trans_len; ///< Transaction data length, in bits
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const void *tx_buffer; ///< Pointer to transmit buffer, or NULL for no MOSI phase
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void *rx_buffer; ///< Pointer to receive buffer, or NULL for no MISO phase
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void *user; ///< User-defined variable. Can be used to store eg transaction ID.
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};
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/**
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* @brief Initialize a SPI bus as a slave interface
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*
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* @warning For now, only supports HSPI and VSPI.
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*
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* @param host SPI peripheral to use as a SPI slave interface
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* @param bus_config Pointer to a spi_bus_config_t struct specifying how the host should be initialized
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* @param slave_config Pointer to a spi_slave_interface_config_t struct specifying the details for the slave interface
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* @param dma_chan Either 1 or 2. A SPI bus used by this driver must have a DMA channel associated with
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* it. The SPI hardware has two DMA channels to share. This parameter indicates which
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* one to use.
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*
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* @warning If a DMA channel is selected, any transmit and receive buffer used should be allocated in
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* DMA-capable memory.
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*
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* @return
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* - ESP_ERR_INVALID_ARG if configuration is invalid
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* - ESP_ERR_INVALID_STATE if host already is in use
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* - ESP_ERR_NO_MEM if out of memory
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* - ESP_OK on success
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*/
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esp_err_t spi_slave_initialize(spi_host_device_t host, const spi_bus_config_t *bus_config, const spi_slave_interface_config_t *slave_config, int dma_chan);
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/**
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* @brief Free a SPI bus claimed as a SPI slave interface
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*
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* @param host SPI peripheral to free
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* @return
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* - ESP_ERR_INVALID_ARG if parameter is invalid
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* - ESP_ERR_INVALID_STATE if not all devices on the bus are freed
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* - ESP_OK on success
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*/
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esp_err_t spi_slave_free(spi_host_device_t host);
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/**
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* @brief Queue a SPI transaction for execution
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*
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* Queues a SPI transaction to be executed by this slave device. (The transaction queue size was specified when the slave
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* device was initialised via spi_slave_initialize.) This function may block if the queue is full (depending on the
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* ticks_to_wait parameter). No SPI operation is directly initiated by this function, the next queued transaction
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* will happen when the master initiates a SPI transaction by pulling down CS and sending out clock signals.
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*
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* This function hands over ownership of the buffers in ``trans_desc`` to the SPI slave driver; the application is
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* not to access this memory until ``spi_slave_queue_trans`` is called to hand ownership back to the application.
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*
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* @param host SPI peripheral that is acting as a slave
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* @param trans_desc Description of transaction to execute. Not const because we may want to write status back
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* into the transaction description.
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* @param ticks_to_wait Ticks to wait until there's room in the queue; use portMAX_DELAY to
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* never time out.
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* @return
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* - ESP_ERR_INVALID_ARG if parameter is invalid
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* - ESP_OK on success
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*/
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esp_err_t spi_slave_queue_trans(spi_host_device_t host, const spi_slave_transaction_t *trans_desc, TickType_t ticks_to_wait);
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/**
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* @brief Get the result of a SPI transaction queued earlier
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*
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* This routine will wait until a transaction to the given device (queued earlier with
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* spi_slave_queue_trans) has succesfully completed. It will then return the description of the
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* completed transaction so software can inspect the result and e.g. free the memory or
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* re-use the buffers.
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*
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* It is mandatory to eventually use this function for any transaction queued by ``spi_slave_queue_trans``.
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*
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* @param host SPI peripheral to that is acting as a slave
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* @param[out] trans_desc Pointer to variable able to contain a pointer to the description of the
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* transaction that is executed
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* @param ticks_to_wait Ticks to wait until there's a returned item; use portMAX_DELAY to never time
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* out.
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* @return
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* - ESP_ERR_INVALID_ARG if parameter is invalid
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* - ESP_OK on success
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*/
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esp_err_t spi_slave_get_trans_result(spi_host_device_t host, spi_slave_transaction_t **trans_desc, TickType_t ticks_to_wait);
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/**
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* @brief Do a SPI transaction
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*
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* Essentially does the same as spi_slave_queue_trans followed by spi_slave_get_trans_result. Do
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* not use this when there is still a transaction queued that hasn't been finalized
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* using spi_slave_get_trans_result.
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*
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* @param host SPI peripheral to that is acting as a slave
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* @param trans_desc Pointer to variable able to contain a pointer to the description of the
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* transaction that is executed. Not const because we may want to write status back
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* into the transaction description.
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* @param ticks_to_wait Ticks to wait until there's a returned item; use portMAX_DELAY to never time
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* out.
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* @return
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* - ESP_ERR_INVALID_ARG if parameter is invalid
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* - ESP_OK on success
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*/
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esp_err_t spi_slave_transmit(spi_host_device_t host, spi_slave_transaction_t *trans_desc, TickType_t ticks_to_wait);
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#ifdef __cplusplus
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}
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#endif
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#endif
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