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647dea9395
During HAL layer refactoring and new chip bringup, we have several caps.h for each part, to reduce the conflicts to minimum. But this is The capabilities headers will be relataive stable once completely written (maybe after the featues are supported by drivers). Now ESP32 and ESP32-S2 drivers are relative stable, making it a good time to combine all these caps.h into one soc_caps.h This cleanup also move HAL config and pin config into separated files, to make the responsibilities of these headers more clear. This is helpful for the stabilities of soc_caps.h because we want to make it public some day.
162 lines
6.1 KiB
C
162 lines
6.1 KiB
C
// Copyright 2015-2019 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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//
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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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/*******************************************************************************
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* NOTICE
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* The hal is not public api, don't use in application code.
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* See readme.md in hal/include/hal/readme.md
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******************************************************************************/
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// The HAL layer for SPI slave (common part)
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// SPI slave HAL usages:
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// 1. initialize the bus
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// 2. initialize the DMA descriptors if DMA used
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// 3. call setup_device to update parameters for the device
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// 4. prepare data to send, and prepare the receiving buffer
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// 5. trigger user defined SPI transaction to start
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// 6. wait until the user transaction is done
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// 7. store the received data and get the length
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// 8. check and reset the DMA (if needed) before the next transaction
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#pragma once
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#include <esp_types.h>
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#include "soc/lldesc.h"
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#include "soc/spi_struct.h"
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#include "soc/soc_caps.h"
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#include "hal/spi_ll.h"
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/**
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* Context that should be maintained by both the driver and the HAL.
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*/
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typedef struct {
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/* configured by driver at initialization, don't touch */
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spi_dev_t *hw; ///< Beginning address of the peripheral registers.
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spi_dma_dev_t *dma_in; ///< Address of the DMA peripheral registers which stores the data received from a peripheral into RAM.
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spi_dma_dev_t *dma_out; ///< Address of the DMA peripheral registers which transmits the data from RAM to a peripheral.
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/* should be configured by driver at initialization */
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lldesc_t *dmadesc_rx; /**< Array of DMA descriptor used by the TX DMA.
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* The amount should be larger than dmadesc_n. The driver should ensure that
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* the data to be sent is shorter than the descriptors can hold.
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*/
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lldesc_t *dmadesc_tx; /**< Array of DMA descriptor used by the RX DMA.
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* The amount should be larger than dmadesc_n. The driver should ensure that
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* the data to be sent is shorter than the descriptors can hold.
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*/
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int dmadesc_n; ///< The amount of descriptors of both ``dmadesc_tx`` and ``dmadesc_rx`` that the HAL can use.
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/*
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* configurations to be filled after ``spi_slave_hal_init``. Updated to
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* peripheral registers when ``spi_slave_hal_setup_device`` is called.
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*/
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struct {
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uint32_t rx_lsbfirst : 1;
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uint32_t tx_lsbfirst : 1;
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uint32_t use_dma : 1;
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};
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int mode;
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/*
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* Transaction specific (data), all these parameters will be updated to the
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* peripheral every transaction.
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*/
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uint32_t bitlen; ///< Expected maximum length of the transaction, in bits.
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const void *tx_buffer; ///< Data to be sent
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void *rx_buffer; ///< Buffer to hold the received data.
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/* Other transaction result after one transaction */
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uint32_t rcv_bitlen; ///< Length of the last transaction, in bits.
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} spi_slave_hal_context_t;
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typedef struct {
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uint32_t host_id; ///< SPI controller ID
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spi_dma_dev_t *dma_in; ///< Input DMA(DMA -> RAM) peripheral register address
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spi_dma_dev_t *dma_out; ///< Output DMA(RAM -> DMA) peripheral register address
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} spi_slave_hal_config_t;
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/**
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* Init the peripheral and the context.
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*
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* @param hal Context of the HAL layer.
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* @param host_id Index of the SPI peripheral. 0 for SPI1, 1 for HSPI (SPI2) and 2 for VSPI (SPI3).
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*/
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void spi_slave_hal_init(spi_slave_hal_context_t *hal, const spi_slave_hal_config_t *hal_config);
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/**
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* Deinit the peripheral (and the context if needed).
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*
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* @param hal Context of the HAL layer.
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*/
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void spi_slave_hal_deinit(spi_slave_hal_context_t *hal);
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/**
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* Setup device-related configurations according to the settings in the context.
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*
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* @param hal Context of the HAL layer.
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*/
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void spi_slave_hal_setup_device(const spi_slave_hal_context_t *hal);
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/**
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* Prepare the data for the current transaction.
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*
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* @param hal Context of the HAL layer.
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*/
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void spi_slave_hal_prepare_data(const spi_slave_hal_context_t *hal);
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/**
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* Trigger start a user-defined transaction.
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*
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* @param hal Context of the HAL layer.
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*/
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void spi_slave_hal_user_start(const spi_slave_hal_context_t *hal);
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/**
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* Check whether the transaction is done (trans_done is set).
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*
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* @param hal Context of the HAL layer.
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*/
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bool spi_slave_hal_usr_is_done(spi_slave_hal_context_t* hal);
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/**
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* Post transaction operations, fetch data from the buffer and recored the length.
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*
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* @param hal Context of the HAL layer.
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*/
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void spi_slave_hal_store_result(spi_slave_hal_context_t *hal);
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/**
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* Get the length of last transaction, in bits. Should be called after ``spi_slave_hal_store_result``.
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*
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* Note that if last transaction is longer than configured before, the return
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* value will be truncated to the configured length.
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*
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* @param hal Context of the HAL layer.
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*
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* @return Length of the last transaction, in bits.
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*/
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uint32_t spi_slave_hal_get_rcv_bitlen(spi_slave_hal_context_t *hal);
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/**
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* Check whether we need to reset the DMA according to the status of last transactions.
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*
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* In ESP32, sometimes we may need to reset the DMA for the slave before the
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* next transaction. Call this to check it.
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*
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* @param hal Context of the HAL layer.
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*
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* @return true if reset is needed, else false.
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*/
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bool spi_slave_hal_dma_need_reset(const spi_slave_hal_context_t *hal);
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