esp32 spi cpu demo

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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);   gpio_reset_pin(GPIO_CS);     gpio_set_direction(GPIO_CS, GPIO_MODE_INPUT);     gpio_set_level(GPIO_CS, value); }   void vSetMISO(int value) {   //  gpio_set_direction(GPIO_MISO, GPIO_MODE_OUTPUT); //写这个或下一个                                                   // 1为高电平，0为低电平   //  gpio_set_level(GPIO_MISO, value);     gpio_reset_pin(GPIO_MISO);     gpio_set_direction(GPIO_MISO, GPIO_MODE_OUTPUT);     gpio_set_level(GPIO_MISO, value); }    void vSetMOSI(int value) {     //gpio_set_direction(GPIO_MOSI, GPIO_MODE_INPUT); //写这个或下一个                                                            // 1为高电平，0为低电平     //gpio_set_level(GPIO_MOSI, value);     gpio_reset_pin(GPIO_MOSI);     gpio_set_direction(GPIO_MOSI, GPIO_MODE_INPUT);     gpio_set_level(GPIO_MOSI, value); }   void vSetSCK(int value) {     //gpio_set_direction(GPIO_SCLK, GPIO_MODE_INPUT); //写这个或下一个                                                            // 1为高电平，0为低电平     //gpio_set_level(GPIO_SCLK, value);      gpio_reset_pin(GPIO_SCLK);     gpio_set_direction(GPIO_SCLK, GPIO_MODE_INPUT);     gpio_set_level(GPIO_SCLK, value); }     static spi_device_handle_t spi_init(spi_host_device_t host_id, gpio_num_t miso_io_num, gpio_num_t mosi_io_num, gpio_num_t sclk_io_num, gpio_num_t cs_io_num, int clock_speed_mhz){     spi_bus_config_t buscfg = {         .miso_io_num = miso_io_num,         .mosi_io_num = mosi_io_num,         .sclk_io_num = sclk_io_num,         .quadwp_io_num = GPIO_NUM_NC,         .quadhd_io_num = GPIO_NUM_NC,     };     ESP_ERROR_CHECK(spi_bus_initialize(host_id, &buscfg, SPI_DMA_DISABLED));           spi_device_interface_config_t devcfg = {         .mode = 3,         .clock_speed_hz = clock_speed_mhz * 1000 * 1000,         .spics_io_num = cs_io_num,         .cs_ena_posttrans = 0,     };     spi_device_handle_t spi_handle = NULL;     ESP_ERROR_CHECK(spi_bus_add_device(host_id, &devcfg, &spi_handle));     return spi_handle; }   /**/ static esp_err_t spi_write(spi_device_handle_t spi, uint8_t *data, int len){     esp_err_t err;     err = spi_device_acquire_bus(spi, portMAX_DELAY);     if (err != ESP_OK) return err;       spi_transaction_t t = {         .length = len*8,         .flags = SPI_TRANS_USE_TXDATA,         .tx_buffer = data,     };     err = spi_device_polling_transmit(spi, &t);       spi_device_release_bus(spi);     return err; }   /**/ static esp_err_t spi_read(spi_device_handle_t spi, uint8_t *data, int len){     spi_transaction_t t = {         .length = len*8,         .flags = SPI_TRANS_USE_RXDATA,         .rx_buffer = data,     };       return spi_device_polling_transmit(spi, &t); }   /**/ static esp_err_t spi_write_read(spi_device_handle_t spi, uint8_t *w_data, uint8_t *r_data, int len){     esp_err_t err;     err = spi_write(spi, w_data, len);     if (err!= ESP_OK) return err;       err = spi_read(spi, r_data, len);       return err; }    #define ESP_SPI_FREQ 1     #define ESP_SPI_HOST SPI3_HOST     #define PIN_NUM_MISO 37     #define PIN_NUM_MOSI 35     #define PIN_NUM_CLK  36     #define PIN_NUM_CS   34 // Main application void app_main(void) {           uint8_t cmd[10] = {0x55, 0x00, 0xB0, 0x99, 0x00, 0x00, 0x02, 0x00, 0x08, 0x00};     cmd[9] = getLRCx(&cmd[1], 8);     uint8_t tx_str[10];           memcpy(tx_str, cmd, 10);       spi_device_handle_t spi_hdl;     spi_hdl = spi_init(ESP_SPI_HOST, PIN_NUM_MISO, PIN_NUM_MOSI, PIN_NUM_CLK, PIN_NUM_CS, ESP_SPI_FREQ);              vSetSSN(0);     vTaskDelay(pdMS_TO_TICKS(100));         esp_err_t err;     err = spi_write(spi_hdl, tx_str, 10);         vTaskDelay(pdMS_TO_TICKS(5));     //  vTaskDelay(100);     vSetSSN(1);     vTaskDelay(pdMS_TO_TICKS(10));     vSetSSN(0);     vTaskDelay(pdMS_TO_TICKS(100));     uint8_t rx_buffer[10];        err = spi_read(spi_hdl, rx_buffer, 10);    ESP_LOGI(TAG, "W25Q64_readStatusReg2=%x", rx_buffer[0]);     // Never reached.     err = spi_bus_remove_device(spi_hdl);   }