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# mos-lobo-spi-lib
SPI lib for mongoose-os based on https://github.com/loboris/ESP32_TFT_library

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// Copyright 2010-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef _DRIVER_SPI_MASTER_LOBO_H_
#define _DRIVER_SPI_MASTER_LOBO_H_
#include "esp_err.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "soc/spi_struct.h"
#include "esp_intr.h"
#include "esp_intr_alloc.h"
#include "rom/lldesc.h"
#ifdef __cplusplus
extern "C"
{
#endif
//Maximum amount of bytes that can be put in one DMA descriptor
#define SPI_MAX_DMA_LEN (4096-4)
/**
* @brief Enum with the three SPI peripherals that are software-accessible in it
*/
typedef enum {
SPI_HOST=0, ///< SPI1, SPI; Cannot be used in this driver!
HSPI_HOST=1, ///< SPI2, HSPI
VSPI_HOST=2 ///< SPI3, VSPI
} spi_lobo_host_device_t;
/**
* @brief This is a configuration structure for a SPI bus.
*
* You can use this structure to specify the GPIO pins of the bus. Normally, the driver will use the
* GPIO matrix to route the signals. An exception is made when all signals either can be routed through
* the IO_MUX or are -1. In that case, the IO_MUX is used, allowing for >40MHz speeds.
*/
typedef struct {
int mosi_io_num; ///< GPIO pin for Master Out Slave In (=spi_d) signal, or -1 if not used.
int miso_io_num; ///< GPIO pin for Master In Slave Out (=spi_q) signal, or -1 if not used.
int sclk_io_num; ///< GPIO pin for Spi CLocK signal, or -1 if not used.
int quadwp_io_num; ///< GPIO pin for WP (Write Protect) signal which is used as D2 in 4-bit communication modes, or -1 if not used.
int quadhd_io_num; ///< GPIO pin for HD (HolD) signal which is used as D3 in 4-bit communication modes, or -1 if not used.
int max_transfer_sz; ///< Maximum transfer size, in bytes. Defaults to 4094 if 0.
} spi_lobo_bus_config_t;
#define SPI_DEVICE_TXBIT_LSBFIRST (1<<0) ///< Transmit command/address/data LSB first instead of the default MSB first
#define SPI_DEVICE_RXBIT_LSBFIRST (1<<1) ///< Receive data LSB first instead of the default MSB first
#define SPI_DEVICE_BIT_LSBFIRST (SPI_TXBIT_LSBFIRST|SPI_RXBIT_LSBFIRST); ///< Transmit and receive LSB first
#define SPI_DEVICE_3WIRE (1<<2) ///< Use spiq for both sending and receiving data
#define SPI_DEVICE_POSITIVE_CS (1<<3) ///< Make CS positive during a transaction instead of negative
#define SPI_DEVICE_HALFDUPLEX (1<<4) ///< Transmit data before receiving it, instead of simultaneously
#define SPI_DEVICE_CLK_AS_CS (1<<5) ///< Output clock on CS line if CS is active
#define SPI_ERR_OTHER_CONFIG 7001
typedef struct spi_lobo_transaction_t spi_lobo_transaction_t;
typedef void(*transaction_cb_t)(spi_lobo_transaction_t *trans);
/**
* @brief This is a configuration for a SPI slave device that is connected to one of the SPI buses.
*/
typedef struct {
uint8_t command_bits; ///< Amount of bits in command phase (0-16)
uint8_t address_bits; ///< Amount of bits in address phase (0-64)
uint8_t dummy_bits; ///< Amount of dummy bits to insert between address and data phase
uint8_t mode; ///< SPI mode (0-3)
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.
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.
uint8_t cs_ena_posttrans; ///< Amount of SPI bit-cycles the cs should stay active after the transmission (0-16)
int clock_speed_hz; ///< Clock speed, in Hz
int spics_io_num; ///< CS GPIO pin for this device, handled by hardware; set to -1 if not used
int spics_ext_io_num; ///< CS GPIO pin for this device, handled by software (spi_lobo_device_select/spi_lobo_device_deselect); only used if spics_io_num=-1
uint32_t flags; ///< Bitwise OR of SPI_DEVICE_* flags
transaction_cb_t pre_cb; ///< Callback to be called before a transmission is started. This callback from 'spi_lobo_transfer_data' function.
transaction_cb_t post_cb; ///< Callback to be called after a transmission has completed. This callback from 'spi_lobo_transfer_data' function.
uint8_t selected; ///< **INTERNAL** 1 if the device's CS pin is active
} spi_lobo_device_interface_config_t;
#define SPI_TRANS_MODE_DIO (1<<0) ///< Transmit/receive data in 2-bit mode
#define SPI_TRANS_MODE_QIO (1<<1) ///< Transmit/receive data in 4-bit mode
#define SPI_TRANS_MODE_DIOQIO_ADDR (1<<2) ///< Also transmit address in mode selected by SPI_MODE_DIO/SPI_MODE_QIO
#define SPI_TRANS_USE_RXDATA (1<<3) ///< Receive into rx_data member of spi_lobo_transaction_t instead into memory at rx_buffer.
#define SPI_TRANS_USE_TXDATA (1<<4) ///< Transmit tx_data member of spi_lobo_transaction_t instead of data at tx_buffer. Do not set tx_buffer when using this.
/**
* This structure describes one SPI transmission
*/
struct spi_lobo_transaction_t {
uint32_t flags; ///< Bitwise OR of SPI_TRANS_* flags
uint16_t command; ///< Command data. Specific length was given when device was added to the bus.
uint64_t address; ///< Address. Specific length was given when device was added to the bus.
size_t length; ///< Total data length to be transmitted to the device, in bits; if 0, no data is transmitted
size_t rxlength; ///< Total data length to be received from the device, in bits; if 0, no data is received
void *user; ///< User-defined variable. Can be used to store eg transaction ID or data to be used by pre_cb and/or post_cb callbacks.
union {
const void *tx_buffer; ///< Pointer to transmit buffer, or NULL for no MOSI phase
uint8_t tx_data[4]; ///< If SPI_USE_TXDATA is set, data set here is sent directly from this variable.
};
union {
void *rx_buffer; ///< Pointer to receive buffer, or NULL for no MISO phase
uint8_t rx_data[4]; ///< If SPI_USE_RXDATA is set, data is received directly to this variable
};
};
#define NO_CS 3 // Number of CS pins per SPI host
#define NO_DEV 6 // Number of spi devices per SPI host; more than 3 devices can be attached to the same bus if using software CS's
#define SPI_SEMAPHORE_WAIT 2000 // Time in ms to wait for SPI mutex
typedef struct spi_lobo_device_t spi_lobo_device_t;
typedef struct {
spi_lobo_device_t *device[NO_DEV];
intr_handle_t intr;
spi_dev_t *hw;
//spi_lobo_transaction_t *cur_trans;
int cur_device;
lldesc_t *dmadesc_tx;
lldesc_t *dmadesc_rx;
bool no_gpio_matrix;
int dma_chan;
int max_transfer_sz;
QueueHandle_t spi_lobo_bus_mutex;
spi_lobo_bus_config_t cur_bus_config;
} spi_lobo_host_t;
struct spi_lobo_device_t {
spi_lobo_device_interface_config_t cfg;
spi_lobo_host_t *host;
spi_lobo_bus_config_t bus_config;
spi_lobo_host_device_t host_dev;
};
typedef spi_lobo_device_t* spi_lobo_device_handle_t; ///< Handle for a device on a SPI bus
typedef spi_lobo_host_t* spi_lobo_host_handle_t;
typedef spi_lobo_device_interface_config_t* spi_lobo_device_interface_config_handle_t;
/**
* @brief MGOS lib init
*/
bool mgos_mos_lobo_spi_init(void);
/**
* @brief Add a device. This allocates a CS line for the device, allocates memory for the device structure and hooks
* up the CS pin to whatever is specified.
*
* This initializes the internal structures for a device, plus allocates a CS pin on the indicated SPI master
* peripheral and routes it to the indicated GPIO. All SPI master devices have three hw CS pins and can thus control
* up to three devices. Software handled CS pin can also be used for additional devices on the same SPI bus.
*
* ### If selected SPI host device bus is not yet initialized, it is initialized first with 'bus_config' function ###
*
* @note While in general, speeds up to 80MHz on the dedicated SPI pins and 40MHz on GPIO-matrix-routed pins are
* supported, full-duplex transfers routed over the GPIO matrix only support speeds up to 26MHz.
*
* @param host SPI peripheral to allocate device on (HSPI or VSPI)
* @param dev_config SPI interface protocol config for the device
* @param bus_config Pointer to a spi_lobo_bus_config_t struct specifying how the host device bus should be initialized
* @param handle Pointer to variable to hold the device handle
* @return
* - ESP_ERR_INVALID_ARG if parameter is invalid
* - ESP_ERR_NOT_FOUND if host doesn't have any free CS slots
* - ESP_ERR_NO_MEM if out of memory
* - ESP_OK on success
*/
esp_err_t spi_lobo_bus_add_device(spi_lobo_host_device_t host, spi_lobo_bus_config_t *bus_config, spi_lobo_device_interface_config_t *dev_config, spi_lobo_device_handle_t *handle);
/**
* @brief Remove a device from the SPI bus. If after removal no other device is attached to the spi bus device, it is freed.
*
* @param handle Device handle to free
* @return
* - ESP_ERR_INVALID_ARG if parameter is invalid
* - ESP_ERR_INVALID_STATE if device already is freed
* - ESP_OK on success
*/
esp_err_t spi_lobo_bus_remove_device(spi_lobo_device_handle_t handle);
/**
* @brief Return the actuall SPI bus speed for the spi device in Hz
*
* Some frequencies cannot be set, for example 30000000 will actually set SPI clock to 26666666 Hz
*
* @param handle Device handle obtained using spi_lobo_bus_add_device
*
* @return
* - actuall SPI clock
*/
uint32_t spi_lobo_get_speed(spi_lobo_device_handle_t handle);
/**
* @brief Set the new clock speed for the device, return the actuall SPI bus speed set, in Hz
* This function can be used after the device is initialized
*
* Some frequencies cannot be set, for example 30000000 will actually set SPI clock to 26666666 Hz
*
* @param handle Device handle obtained using spi_lobo_bus_add_device
* @param speed New device spi clock to be set in Hz
*
* @return
* - actuall SPI clock
* - 0 if speed cannot be set
*/
uint32_t spi_lobo_set_speed(spi_lobo_device_handle_t handle, uint32_t speed);
/**
* @brief Select spi device for transmission
*
* It configures spi bus with selected spi device parameters if previously selected device was different than the current
* If device's spics_io_num=-1 and spics_ext_io_num > 0 'spics_ext_io_num' pin is set to active state (low)
*
* spi bus device's semaphore is taken before selecting the device
*
* @param handle Device handle obtained using spi_lobo_bus_add_device
* @param force configure spi bus even if the previous device was the same
*
* @return
* - ESP_ERR_INVALID_ARG if parameter is invalid
* - ESP_OK on success
*/
esp_err_t spi_lobo_device_select(spi_lobo_device_handle_t handle, int force);
/**
* @brief De-select spi device
*
* If device's spics_io_num=-1 and spics_ext_io_num > 0 'spics_ext_io_num' pin is set to inactive state (high)
*
* spi bus device's semaphore is given after selecting the device
*
* @param handle Device handle obtained using spi_lobo_bus_add_device
*
* @return
* - ESP_ERR_INVALID_ARG if parameter is invalid
* - ESP_OK on success
*/
esp_err_t spi_lobo_device_deselect(spi_lobo_device_handle_t handle);
/**
* @brief Check if spi bus uses native spi pins
*
* @param handle Device handle obtained using spi_lobo_bus_add_device
*
* @return
* - true if native spi pins are used
* - false if spi pins are routed through gpio matrix
*/
bool spi_lobo_uses_native_pins(spi_lobo_device_handle_t handle);
/**
* @brief Get spi bus native spi pins
*
* @param handle Device handle obtained using spi_lobo_bus_add_device
*
* @return
* places spi bus native pins in provided pointers
*/
void spi_lobo_get_native_pins(int host, int *sdi, int *sdo, int *sck);
/**
* @brief Transimit and receive data to/from spi device based on transaction data
*
* TRANSMIT 8-bit data to spi device from 'trans->tx_buffer' or 'trans->tx_data' (trans->lenght/8 bytes)
* and RECEIVE data to 'trans->rx_buffer' or 'trans->rx_data' (trans->rx_length/8 bytes)
* Lengths must be 8-bit multiples!
* If trans->rx_buffer is NULL or trans->rx_length is 0, only transmits data
* If trans->tx_buffer is NULL or trans->length is 0, only receives data
* If the device is in duplex mode (SPI_DEVICE_HALFDUPLEX flag NOT set), data are transmitted and received simultaneously.
* If the device is in half duplex mode (SPI_DEVICE_HALFDUPLEX flag IS set), data are received after transmission
* 'address', 'command' and 'dummy bits' are transmitted before data phase IF set in device's configuration
* and IF 'trans->length' and 'trans->rx_length' are NOT both 0
* If device was not previously selected, it will be selected before transmission and deselected after transmission.
*
* @param handle Device handle obtained using spi_lobo_bus_add_device
*
* @param trans Pointer to variable containing the description of the transaction that is executed
*
* @return
* - ESP_ERR_INVALID_ARG if parameter is invalid
* - ESP error code if device cannot be selected
* - ESP_OK on success
*
*/
esp_err_t spi_lobo_transfer_data(spi_lobo_device_handle_t handle, spi_lobo_transaction_t *trans);
/*
* SPI transactions uses the semaphore (taken in select function) to protect the transfer
*/
esp_err_t spi_lobo_device_TakeSemaphore(spi_lobo_device_handle_t handle);
void spi_lobo_device_GiveSemaphore(spi_lobo_device_handle_t handle);
/**
* @brief Setup a DMA link chain
*
* This routine will set up a chain of linked DMA descriptors in the array pointed to by
* ``dmadesc``. Enough DMA descriptors will be used to fit the buffer of ``len`` bytes in, and the
* descriptors will point to the corresponding positions in ``buffer`` and linked together. The
* end result is that feeding ``dmadesc[0]`` into DMA hardware results in the entirety ``len`` bytes
* of ``data`` being read or written.
*
* @param dmadesc Pointer to array of DMA descriptors big enough to be able to convey ``len`` bytes
* @param len Length of buffer
* @param data Data buffer to use for DMA transfer
* @param isrx True if data is to be written into ``data``, false if it's to be read from ``data``.
*/
void spi_lobo_setup_dma_desc_links(lldesc_t *dmadesc, int len, const uint8_t *data, bool isrx);
/**
* @brief Check if a DMA reset is requested but has not completed yet
*
* @return True when a DMA reset is requested but hasn't completed yet. False otherwise.
*/
bool spi_lobo_dmaworkaround_reset_in_progress();
/**
* @brief Mark a DMA channel as idle.
*
* A call to this function tells the workaround logic that this channel will
* not be affected by a global SPI DMA reset.
*/
void spi_lobo_dmaworkaround_idle(int dmachan);
/**
* @brief Mark a DMA channel as active.
*
* A call to this function tells the workaround logic that this channel will
* be affected by a global SPI DMA reset, and a reset like that should not be attempted.
*/
void spi_lobo_dmaworkaround_transfer_active(int dmachan);
#ifdef __cplusplus
}
#endif
#endif

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author: Pim van Pelt <pim@ipng.nl>
type: lib
description: Mongoose-OS ESP32 SPI lib
version: 0.1
platforms: [ esp32 ]
sources:
- src
includes:
- include
config_schema:
- ["spi", "o", {title: "LoBo SPI settings"}]
- ["spi.mosi", "i", 18, {title: "LoBo SPI MOSI pin"}]
- ["spi.miso", "i", 19, {title: "LoBo SPI MISO pin"}]
- ["spi.sck", "i", 5, {title: "LoBo SPI SCK pin"}]
tags:
- c
- spi
- hw
manifest_version: 2017-09-29

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