259 lines
14 KiB
C
259 lines
14 KiB
C
// Copyright 2010-2016 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_MASTER_H_
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#define _DRIVER_SPI_MASTER_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_DEVICE_TXBIT_LSBFIRST (1<<0) ///< Transmit command/address/data LSB first instead of the default MSB first
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#define SPI_DEVICE_RXBIT_LSBFIRST (1<<1) ///< Receive data LSB first instead of the default MSB first
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#define SPI_DEVICE_BIT_LSBFIRST (SPI_DEVICE_TXBIT_LSBFIRST|SPI_DEVICE_RXBIT_LSBFIRST) ///< Transmit and receive LSB first
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#define SPI_DEVICE_3WIRE (1<<2) ///< Use MOSI (=spid) for both sending and receiving data
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#define SPI_DEVICE_POSITIVE_CS (1<<3) ///< Make CS positive during a transaction instead of negative
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#define SPI_DEVICE_HALFDUPLEX (1<<4) ///< Transmit data before receiving it, instead of simultaneously
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#define SPI_DEVICE_CLK_AS_CS (1<<5) ///< Output clock on CS line if CS is active
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/** There are timing issue when reading at high frequency (the frequency is related to whether native pins are used, valid time after slave sees the clock).
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* - In half-duplex mode, the driver automatically inserts dummy bits before reading phase to fix the timing issue. Set this flag to disable this feature.
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* - In full-duplex mode, however, the hardware cannot use dummy bits, so there is no way to prevent data being read from getting corrupted.
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* Set this flag to confirm that you're going to work with output only, or read without dummy bits at your own risk.
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*/
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#define SPI_DEVICE_NO_DUMMY (1<<6)
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typedef struct spi_transaction_t spi_transaction_t;
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typedef void(*transaction_cb_t)(spi_transaction_t *trans);
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/**
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* @brief This is a configuration for a SPI slave device that is connected to one of the SPI buses.
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*/
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typedef struct {
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uint8_t command_bits; ///< Default amount of bits in command phase (0-16), used when ``SPI_TRANS_VARIABLE_CMD`` is not used, otherwise ignored.
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uint8_t address_bits; ///< Default amount of bits in address phase (0-64), used when ``SPI_TRANS_VARIABLE_ADDR`` is not used, otherwise ignored.
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uint8_t dummy_bits; ///< Amount of dummy bits to insert between address and data phase
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uint8_t mode; ///< SPI mode (0-3)
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uint8_t duty_cycle_pos; ///< Duty cycle of positive clock, in 1/256th increments (128 = 50%/50% duty). Setting this to 0 (=not setting it) is equivalent to setting this to 128.
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uint8_t cs_ena_pretrans; ///< Amount of SPI bit-cycles the cs should be activated before the transmission (0-16). This only works on half-duplex transactions.
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uint8_t cs_ena_posttrans; ///< Amount of SPI bit-cycles the cs should stay active after the transmission (0-16)
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int clock_speed_hz; ///< Clock speed, in Hz
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int spics_io_num; ///< CS GPIO pin for this device, or -1 if not used
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uint32_t flags; ///< Bitwise OR of SPI_DEVICE_* flags
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int queue_size; ///< Transaction queue size. This sets how many transactions can be 'in the air' (queued using spi_device_queue_trans but not yet finished using spi_device_get_trans_result) at the same time
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transaction_cb_t pre_cb; ///< Callback to be called before a transmission is started. This callback is called within interrupt context.
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transaction_cb_t post_cb; ///< Callback to be called after a transmission has completed. This callback is called within interrupt context.
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} spi_device_interface_config_t;
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#define SPI_TRANS_MODE_DIO (1<<0) ///< Transmit/receive data in 2-bit mode
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#define SPI_TRANS_MODE_QIO (1<<1) ///< Transmit/receive data in 4-bit mode
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#define SPI_TRANS_USE_RXDATA (1<<2) ///< Receive into rx_data member of spi_transaction_t instead into memory at rx_buffer.
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#define SPI_TRANS_USE_TXDATA (1<<3) ///< Transmit tx_data member of spi_transaction_t instead of data at tx_buffer. Do not set tx_buffer when using this.
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#define SPI_TRANS_MODE_DIOQIO_ADDR (1<<4) ///< Also transmit address in mode selected by SPI_MODE_DIO/SPI_MODE_QIO
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#define SPI_TRANS_VARIABLE_CMD (1<<5) ///< Use the ``command_bits`` in ``spi_transaction_ext_t`` rather than default value in ``spi_device_interface_config_t``.
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#define SPI_TRANS_VARIABLE_ADDR (1<<6) ///< Use the ``address_bits`` in ``spi_transaction_ext_t`` rather than default value in ``spi_device_interface_config_t``.
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/**
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* This structure describes one SPI transaction. The descriptor should not be modified until the transaction finishes.
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*/
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struct spi_transaction_t {
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uint32_t flags; ///< Bitwise OR of SPI_TRANS_* flags
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uint16_t cmd; /**< Command data, of which the length is set in the ``command_bits`` of spi_device_interface_config_t.
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*
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* <b>NOTE: this field, used to be "command" in ESP-IDF 2.1 and before, is re-written to be used in a new way in ESP-IDF 3.0.</b>
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*
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* Example: write 0x0123 and command_bits=12 to send command 0x12, 0x3_ (in previous version, you may have to write 0x3_12).
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*/
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uint64_t addr; /**< Address data, of which the length is set in the ``address_bits`` of spi_device_interface_config_t.
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*
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* <b>NOTE: this field, used to be "address" in ESP-IDF 2.1 and before, is re-written to be used in a new way in ESP-IDF3.0.</b>
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*
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* Example: write 0x123400 and address_bits=24 to send address of 0x12, 0x34, 0x00 (in previous version, you may have to write 0x12340000).
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*/
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size_t length; ///< Total data length, in bits
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size_t rxlength; ///< Total data length received, should be not greater than ``length`` in full-duplex mode (0 defaults this to the value of ``length``).
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void *user; ///< User-defined variable. Can be used to store eg transaction ID.
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union {
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const void *tx_buffer; ///< Pointer to transmit buffer, or NULL for no MOSI phase
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uint8_t tx_data[4]; ///< If SPI_USE_TXDATA is set, data set here is sent directly from this variable.
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};
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union {
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void *rx_buffer; ///< Pointer to receive buffer, or NULL for no MISO phase. Written by 4 bytes-unit if DMA is used.
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uint8_t rx_data[4]; ///< If SPI_USE_RXDATA is set, data is received directly to this variable
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};
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} ; //the rx data should start from a 32-bit aligned address to get around dma issue.
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/**
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* This struct is for SPI transactions which may change their address and command length.
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* Please do set the flags in base to ``SPI_TRANS_VARIABLE_CMD_ADR`` to use the bit length here.
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*/
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typedef struct {
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struct spi_transaction_t base; ///< Transaction data, so that pointer to spi_transaction_t can be converted into spi_transaction_ext_t
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uint8_t command_bits; ///< The command length in this transaction, in bits.
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uint8_t address_bits; ///< The address length in this transaction, in bits.
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} spi_transaction_ext_t ;
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typedef struct spi_device_t* spi_device_handle_t; ///< Handle for a device on a SPI bus
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/**
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* @brief Initialize a SPI bus
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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 that controls this bus
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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 dma_chan Either channel 1 or 2, or 0 in the case when no DMA is required. Selecting a DMA channel
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* for a SPI bus allows transfers on the bus to have sizes only limited by the amount of
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* internal memory. Selecting no DMA channel (by passing the value 0) limits the amount of
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* bytes transfered to a maximum of 32.
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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_bus_initialize(spi_host_device_t host, const spi_bus_config_t *bus_config, int dma_chan);
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/**
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* @brief Free a SPI bus
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*
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* @warning In order for this to succeed, all devices have to be removed first.
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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_bus_free(spi_host_device_t host);
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/**
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* @brief Allocate a device on a SPI bus
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*
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* This initializes the internal structures for a device, plus allocates a CS pin on the indicated SPI master
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* peripheral and routes it to the indicated GPIO. All SPI master devices have three CS pins and can thus control
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* up to three devices.
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*
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* @note While in general, speeds up to 80MHz on the dedicated SPI pins and 40MHz on GPIO-matrix-routed pins are
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* supported, full-duplex transfers routed over the GPIO matrix only support speeds up to 26MHz.
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*
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* @param host SPI peripheral to allocate device on
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* @param dev_config SPI interface protocol config for the device
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* @param handle Pointer to variable to hold the device handle
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* @return
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* - ESP_ERR_INVALID_ARG if parameter is invalid
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* - ESP_ERR_NOT_FOUND if host doesn't have any free CS slots
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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_bus_add_device(spi_host_device_t host, const spi_device_interface_config_t *dev_config, spi_device_handle_t *handle);
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/**
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* @brief Remove a device from the SPI bus
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*
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* @param handle Device handle 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 device already is freed
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* - ESP_OK on success
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*/
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esp_err_t spi_bus_remove_device(spi_device_handle_t handle);
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/**
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* @brief Queue a SPI transaction for execution
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*
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* @param handle Device handle obtained using spi_host_add_dev
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* @param trans_desc Description of transaction to execute
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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_ERR_TIMEOUT if there was no room in the queue before ticks_to_wait expired
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* - ESP_ERR_NO_MEM if allocating DMA-capable temporary buffer failed
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* - ESP_OK on success
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*/
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esp_err_t spi_device_queue_trans(spi_device_handle_t handle, spi_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_device_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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* @param handle Device handle obtained using spi_host_add_dev
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* @param trans_desc Pointer to variable able to contain a pointer to the description of the transaction
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that is executed. The descriptor should not be modified until the descriptor is returned by
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spi_device_get_trans_result.
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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_ERR_TIMEOUT if there was no completed transaction before ticks_to_wait expired
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* - ESP_OK on success
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*/
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esp_err_t spi_device_get_trans_result(spi_device_handle_t handle, spi_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_device_queue_trans followed by spi_device_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_device_get_trans_result.
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*
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* @param handle Device handle obtained using spi_host_add_dev
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* @param trans_desc Description of transaction to execute
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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_device_transmit(spi_device_handle_t handle, spi_transaction_t *trans_desc);
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/**
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* @brief Calculate the working frequency that is most close to desired frequency, and also the register value.
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*
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* @param fapb The frequency of apb clock, should be ``APB_CLK_FREQ``.
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* @param hz Desired working frequency
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* @param duty_cycle Duty cycle of the spi clock
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* @param reg_o Output of value to be set in clock register, or NULL if not needed.
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* @return Actual working frequency that most fit.
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*/
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int spi_cal_clock(int fapb, int hz, int duty_cycle, uint32_t* reg_o);
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#ifdef __cplusplus
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}
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#endif
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#endif
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