1 /* 2 * SPDX-FileCopyrightText: 2010-2022 Espressif Systems (Shanghai) CO LTD 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 */ 6 7 #pragma once 8 9 #include <stdint.h> 10 #include <stdbool.h> 11 #include "sdkconfig.h" 12 #include "esp_err.h" 13 #include "esp_ipc.h" 14 #include "intr_types.h" 15 #include "hal/spi_types.h" 16 17 #ifdef __cplusplus 18 extern "C" 19 { 20 #endif 21 22 //Maximum amount of bytes that can be put in one DMA descriptor 23 #define SPI_MAX_DMA_LEN (4096-4) 24 25 /** 26 * Transform unsigned integer of length <= 32 bits to the format which can be 27 * sent by the SPI driver directly. 28 * 29 * E.g. to send 9 bits of data, you can: 30 * 31 * uint16_t data = SPI_SWAP_DATA_TX(0x145, 9); 32 * 33 * Then points tx_buffer to ``&data``. 34 * 35 * @param DATA Data to be sent, can be uint8_t, uint16_t or uint32_t. 36 * @param LEN Length of data to be sent, since the SPI peripheral sends from 37 * the MSB, this helps to shift the data to the MSB. 38 */ 39 #define SPI_SWAP_DATA_TX(DATA, LEN) __builtin_bswap32((uint32_t)(DATA)<<(32-(LEN))) 40 41 /** 42 * Transform received data of length <= 32 bits to the format of an unsigned integer. 43 * 44 * E.g. to transform the data of 15 bits placed in a 4-byte array to integer: 45 * 46 * uint16_t data = SPI_SWAP_DATA_RX(*(uint32_t*)t->rx_data, 15); 47 * 48 * @param DATA Data to be rearranged, can be uint8_t, uint16_t or uint32_t. 49 * @param LEN Length of data received, since the SPI peripheral writes from 50 * the MSB, this helps to shift the data to the LSB. 51 */ 52 #define SPI_SWAP_DATA_RX(DATA, LEN) (__builtin_bswap32(DATA)>>(32-(LEN))) 53 54 #define SPICOMMON_BUSFLAG_SLAVE 0 ///< Initialize I/O in slave mode 55 #define SPICOMMON_BUSFLAG_MASTER (1<<0) ///< Initialize I/O in master mode 56 #define SPICOMMON_BUSFLAG_IOMUX_PINS (1<<1) ///< Check using iomux pins. Or indicates the pins are configured through the IO mux rather than GPIO matrix. 57 #define SPICOMMON_BUSFLAG_GPIO_PINS (1<<2) ///< Force the signals to be routed through GPIO matrix. Or indicates the pins are routed through the GPIO matrix. 58 #define SPICOMMON_BUSFLAG_SCLK (1<<3) ///< Check existing of SCLK pin. Or indicates CLK line initialized. 59 #define SPICOMMON_BUSFLAG_MISO (1<<4) ///< Check existing of MISO pin. Or indicates MISO line initialized. 60 #define SPICOMMON_BUSFLAG_MOSI (1<<5) ///< Check existing of MOSI pin. Or indicates MOSI line initialized. 61 #define SPICOMMON_BUSFLAG_DUAL (1<<6) ///< Check MOSI and MISO pins can output. Or indicates bus able to work under DIO mode. 62 #define SPICOMMON_BUSFLAG_WPHD (1<<7) ///< Check existing of WP and HD pins. Or indicates WP & HD pins initialized. 63 #define SPICOMMON_BUSFLAG_QUAD (SPICOMMON_BUSFLAG_DUAL|SPICOMMON_BUSFLAG_WPHD) ///< Check existing of MOSI/MISO/WP/HD pins as output. Or indicates bus able to work under QIO mode. 64 #define SPICOMMON_BUSFLAG_IO4_IO7 (1<<8) ///< Check existing of IO4~IO7 pins. Or indicates IO4~IO7 pins initialized. 65 #define SPICOMMON_BUSFLAG_OCTAL (SPICOMMON_BUSFLAG_QUAD|SPICOMMON_BUSFLAG_IO4_IO7) ///< Check existing of MOSI/MISO/WP/HD/SPIIO4/SPIIO5/SPIIO6/SPIIO7 pins as output. Or indicates bus able to work under octal mode. 66 #define SPICOMMON_BUSFLAG_NATIVE_PINS SPICOMMON_BUSFLAG_IOMUX_PINS 67 68 /** 69 * @brief SPI DMA channels 70 */ 71 typedef enum { 72 SPI_DMA_DISABLED = 0, ///< Do not enable DMA for SPI 73 #if CONFIG_IDF_TARGET_ESP32 74 SPI_DMA_CH1 = 1, ///< Enable DMA, select DMA Channel 1 75 SPI_DMA_CH2 = 2, ///< Enable DMA, select DMA Channel 2 76 #endif 77 SPI_DMA_CH_AUTO = 3, ///< Enable DMA, channel is automatically selected by driver 78 } spi_common_dma_t; 79 80 #if __cplusplus 81 /* Needed for C++ backwards compatibility with earlier ESP-IDF where this argument is a bare 'int'. Can be removed in ESP-IDF 5 */ 82 typedef int spi_dma_chan_t; 83 #else 84 typedef spi_common_dma_t spi_dma_chan_t; 85 #endif 86 87 /** 88 * @brief This is a configuration structure for a SPI bus. 89 * 90 * You can use this structure to specify the GPIO pins of the bus. Normally, the driver will use the 91 * GPIO matrix to route the signals. An exception is made when all signals either can be routed through 92 * the IO_MUX or are -1. In that case, the IO_MUX is used, allowing for >40MHz speeds. 93 * 94 * @note Be advised that the slave driver does not use the quadwp/quadhd lines and fields in spi_bus_config_t refering to these lines will be ignored and can thus safely be left uninitialized. 95 */ 96 typedef struct { 97 union { 98 int mosi_io_num; ///< GPIO pin for Master Out Slave In (=spi_d) signal, or -1 if not used. 99 int data0_io_num; ///< GPIO pin for spi data0 signal in quad/octal mode, or -1 if not used. 100 }; 101 union { 102 int miso_io_num; ///< GPIO pin for Master In Slave Out (=spi_q) signal, or -1 if not used. 103 int data1_io_num; ///< GPIO pin for spi data1 signal in quad/octal mode, or -1 if not used. 104 }; 105 int sclk_io_num; ///< GPIO pin for SPI Clock signal, or -1 if not used. 106 union { 107 int quadwp_io_num; ///< GPIO pin for WP (Write Protect) signal, or -1 if not used. 108 int data2_io_num; ///< GPIO pin for spi data2 signal in quad/octal mode, or -1 if not used. 109 }; 110 union { 111 int quadhd_io_num; ///< GPIO pin for HD (Hold) signal, or -1 if not used. 112 int data3_io_num; ///< GPIO pin for spi data3 signal in quad/octal mode, or -1 if not used. 113 }; 114 int data4_io_num; ///< GPIO pin for spi data4 signal in octal mode, or -1 if not used. 115 int data5_io_num; ///< GPIO pin for spi data5 signal in octal mode, or -1 if not used. 116 int data6_io_num; ///< GPIO pin for spi data6 signal in octal mode, or -1 if not used. 117 int data7_io_num; ///< GPIO pin for spi data7 signal in octal mode, or -1 if not used. 118 int max_transfer_sz; ///< Maximum transfer size, in bytes. Defaults to 4092 if 0 when DMA enabled, or to `SOC_SPI_MAXIMUM_BUFFER_SIZE` if DMA is disabled. 119 uint32_t flags; ///< Abilities of bus to be checked by the driver. Or-ed value of ``SPICOMMON_BUSFLAG_*`` flags. 120 intr_cpu_id_t isr_cpu_id; ///< Select cpu core to register SPI ISR. 121 int intr_flags; /**< Interrupt flag for the bus to set the priority, and IRAM attribute, see 122 * ``esp_intr_alloc.h``. Note that the EDGE, INTRDISABLED attribute are ignored 123 * by the driver. Note that if ESP_INTR_FLAG_IRAM is set, ALL the callbacks of 124 * the driver, and their callee functions, should be put in the IRAM. 125 */ 126 } spi_bus_config_t; 127 128 129 /** 130 * @brief Initialize a SPI bus 131 * 132 * @warning SPI0/1 is not supported 133 * 134 * @param host_id SPI peripheral that controls this bus 135 * @param bus_config Pointer to a spi_bus_config_t struct specifying how the host should be initialized 136 * @param dma_chan - Selecting a DMA channel for an SPI bus allows transactions on the bus with size only limited by the amount of internal memory. 137 * - Selecting SPI_DMA_DISABLED limits the size of transactions. 138 * - Set to SPI_DMA_DISABLED if only the SPI flash uses this bus. 139 * - Set to SPI_DMA_CH_AUTO to let the driver to allocate the DMA channel. 140 * 141 * @warning If a DMA channel is selected, any transmit and receive buffer used should be allocated in 142 * DMA-capable memory. 143 * 144 * @warning The ISR of SPI is always executed on the core which calls this 145 * function. Never starve the ISR on this core or the SPI transactions will not 146 * be handled. 147 * 148 * @return 149 * - ESP_ERR_INVALID_ARG if configuration is invalid 150 * - ESP_ERR_INVALID_STATE if host already is in use 151 * - ESP_ERR_NOT_FOUND if there is no available DMA channel 152 * - ESP_ERR_NO_MEM if out of memory 153 * - ESP_OK on success 154 */ 155 esp_err_t spi_bus_initialize(spi_host_device_t host_id, const spi_bus_config_t *bus_config, spi_dma_chan_t dma_chan); 156 157 /** 158 * @brief Free a SPI bus 159 * 160 * @warning In order for this to succeed, all devices have to be removed first. 161 * 162 * @param host_id SPI peripheral to free 163 * @return 164 * - ESP_ERR_INVALID_ARG if parameter is invalid 165 * - ESP_ERR_INVALID_STATE if bus hasn't been initialized before, or not all devices on the bus are freed 166 * - ESP_OK on success 167 */ 168 esp_err_t spi_bus_free(spi_host_device_t host_id); 169 170 #ifdef __cplusplus 171 } 172 #endif 173
