esp32 spi

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227

/* SPI Slave example, sender (uses SPI master driver)      This example code is in the Public Domain (or CC0 licensed, at your option.)      Unless required by applicable law or agreed to in writing, this    software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR    CONDITIONS OF ANY KIND, either express or implied. */ #include <stdio.h> #include <stdint.h> #include <stddef.h> #include <string.h>   #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "freertos/semphr.h" #include "freertos/queue.h"   #include "lwip/sockets.h" #include "lwip/dns.h" #include "lwip/netdb.h" #include "lwip/igmp.h"   #include "esp_wifi.h" #include "esp_system.h" #include "esp_event.h" #include "nvs_flash.h" #include "soc/rtc_periph.h" #include "driver/spi_master.h" #include "esp_log.h" #include "esp_spi_flash.h"   #include "driver/gpio.h" #include "esp_intr_alloc.h"   /* SPI sender (master) example.   This example is supposed to work together with the SPI receiver. It uses the standard SPI pins (MISO, MOSI, SCLK, CS) to transmit data over in a full-duplex fashion, that is, while the master puts data on the MOSI pin, the slave puts its own data on the MISO pin.   This example uses one extra pin: GPIO_HANDSHAKE is used as a handshake pin. The slave makes this pin high as soon as it is ready to receive/send data. This code connects this line to a GPIO interrupt which gives the rdySem semaphore. The main task waits for this semaphore to be given before queueing a transmission. */   /* Pins in use. The SPI Master can use the GPIO mux, so feel free to change these if needed. */ #if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2 #define GPIO_HANDSHAKE 2 #define GPIO_MOSI 35 #define GPIO_MISO 37 #define GPIO_SCLK 36 #define GPIO_CS 34   #elif CONFIG_IDF_TARGET_ESP32C3 #define GPIO_HANDSHAKE 3 #define GPIO_MOSI 7 #define GPIO_MISO 2 #define GPIO_SCLK 6 #define GPIO_CS 10   #elif CONFIG_IDF_TARGET_ESP32S3 #define GPIO_HANDSHAKE 2 #define GPIO_MOSI 11 #define GPIO_MISO 13 #define GPIO_SCLK 12 #define GPIO_CS 10   #endif // CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2   #ifdef CONFIG_IDF_TARGET_ESP32 #define SENDER_HOST HSPI_HOST   #else #define SENDER_HOST SPI2_HOST   #endif   // The semaphore indicating the slave is ready to receive stuff. static xQueueHandle rdySem;   uint8_t getLRCx(uint8_t *pData, uint16_t length) {     uint8_t LCR1 = pData[0];       for (uint16_t i = 1; i < length; i++)     {           LCR1 ^= pData[i];     }       LCR1 = ~LCR1;       return LCR1; } /* This ISR is called when the handshake line goes high. */ static void IRAM_ATTR gpio_handshake_isr_handler(void *arg) {     // Sometimes due to interference or ringing or something, we get two irqs after eachother. This is solved by     // looking at the time between interrupts and refusing any interrupt too close to another one.     static uint32_t lasthandshaketime;     uint32_t currtime = esp_cpu_get_ccount();     uint32_t diff = currtime - lasthandshaketime;     if (diff < 240000)         return; // ignore everything <1ms after an earlier irq     lasthandshaketime = currtime;       // Give the semaphore.     BaseType_t mustYield = false;     xSemaphoreGiveFromISR(rdySem, &mustYield);     if (mustYield)         portYIELD_FROM_ISR(); }   void vSetSSN(int value) {     // GPIO_CS     gpio_set_direction(GPIO_CS, GPIO_MODE_INPUT); //写这个或下一个                                                   // 1为高电平，0为低电平     gpio_set_level(GPIO_CS, value); } // Main application void app_main(void) {     esp_err_t ret;     spi_device_handle_t handle;       // Configuration for the SPI bus     spi_bus_config_t buscfg = {         .mosi_io_num = GPIO_MOSI,         .miso_io_num = GPIO_MISO,         .sclk_io_num = GPIO_SCLK,         .quadwp_io_num = -1,         .quadhd_io_num = -1};       // Configuration for the SPI device on the other side of the bus     spi_device_interface_config_t devcfg = {         .command_bits = 0,         .address_bits = 0,         .dummy_bits = 0,         .clock_speed_hz = 20000,         .duty_cycle_pos = 128, // 50% duty cycle         .mode = 3,         .spics_io_num = GPIO_CS,         .cs_ena_posttrans = 3, // Keep the CS low 3 cycles after transaction, to stop slave from missing the last bit when CS has less propagation delay than CLK         .queue_size = 3};       // GPIO config for the handshake line.     gpio_config_t io_conf = {         .intr_type = GPIO_INTR_POSEDGE,         .mode = GPIO_MODE_INPUT,         .pull_up_en = 1,         .pin_bit_mask = (1 << GPIO_HANDSHAKE)};       uint8_t cmd[10] = {0x55, 0x00, 0xB0, 0x99, 0x00, 0x00, 0x02, 0x00, 0x08, 0x00};     cmd[9] = getLRCx(&cmd[1], 8);       char sendbuf[10];     char recvbuf[10];     spi_transaction_t t;     memset(&t, 0, sizeof(t));     memcpy(sendbuf, cmd, 10);     // Create the semaphore.     rdySem = xSemaphoreCreateBinary();       // Set up handshake line interrupt.     gpio_config(&io_conf);     gpio_install_isr_service(0);     gpio_set_intr_type(GPIO_HANDSHAKE, GPIO_INTR_POSEDGE);     gpio_isr_handler_add(GPIO_HANDSHAKE, gpio_handshake_isr_handler, NULL);       // Initialize the SPI bus and add the device we want to send stuff to.     ret = spi_bus_initialize(SENDER_HOST, &buscfg, SPI_DMA_CH_AUTO);     assert(ret == ESP_OK);     ret = spi_bus_add_device(SENDER_HOST, &devcfg, &handle);     assert(ret == ESP_OK);       // Assume the slave is ready for the first transmission: if the slave started up before us, we will not detect     // positive edge on the handshake line.       vSetSSN(0);     /*     t.length = sizeof(sendbuf) * 8;     t.tx_buffer = sendbuf;     t.rx_buffer = recvbuf;     // Wait for slave to be ready for next byte before sending     //       xSemaphoreTake(rdySem, portMAX_DELAY); //Wait until slave is ready     ret = spi_device_transmit(handle, &t);      */     memset(&t, 0, sizeof(t));     t.length = 10 * 8;     t.rxlength = 10 * 8;     t.rx_buffer = recvbuf;     ret = spi_device_polling_transmit(handle, &t);       printf("Received: %s\n", recvbuf);     // vSetSSN(1);       /*       char sendbuf2[1];     char recvbuf2[100];     memset(recvbuf2, 0, sizeof(recvbuf2));     memset(&t, 0, sizeof(t));     vTaskDelay(100);     vSetSSN(0);     t.length = 8;     t.tx_buffer = sendbuf2;     memset(sendbuf2, 0, sizeof(sendbuf2));     t.rx_buffer = recvbuf2;     // Wait for slave to be ready for next byte before sending     //       xSemaphoreTake(rdySem, portMAX_DELAY); //Wait until slave is ready     ret = spi_device_transmit(handle, &t);       printf("Received: %s\n", recvbuf2);     vSetSSN(1);       */     // Never reached.     ret = spi_bus_remove_device(handle);     assert(ret == ESP_OK); }