Cannot use Slave mode with esp_camera

openedhardware commented 3 years ago

I'd like to take a photo and send to the SPI master, but SPI slave library doesn't work with esp_camera module together.

Each module individually works fine. I can send any data to SPI master without esp_camera module enabled and also can take a photo without slave module enabled.. But problem occurs when I enable both at the same time.

Here is my code:

#include "esp_camera.h"
#include "esp_system.h"
#include <Arduino.h>
#include "soc/soc.h"                // Disable brownour problems
#include "soc/rtc_cntl_reg.h"       // Disable brownour problems
#define CAMERA_MODEL_AI_THINKER     // Has PSRAM
#include "camera_pins.h"
#include <ESP32DMASPISlave.h>

#define PIN_FLASH         4

camera_fb_t * fb = NULL;
ESP32DMASPI::Slave slave;

static const uint32_t BUFFER_SIZE = 8192;
uint8_t* spi_slave_tx_buf;
uint8_t* spi_slave_rx_buf;
unsigned long cnt = 0;

void setup() {

  delay(3000);
  WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0);    // Turn-off the 'browout detector'

  pinMode(PIN_FLASH, OUTPUT);
  digitalWrite(PIN_FLASH, LOW);

  Serial.begin(115200);
  Serial.setDebugOutput(true);

  camera_config_t config;
  config.ledc_channel = LEDC_CHANNEL_0;
  config.ledc_timer = LEDC_TIMER_0;
  config.pin_d0 = Y2_GPIO_NUM;
  config.pin_d1 = Y3_GPIO_NUM;
  config.pin_d2 = Y4_GPIO_NUM;
  config.pin_d3 = Y5_GPIO_NUM;
  config.pin_d4 = Y6_GPIO_NUM;
  config.pin_d5 = Y7_GPIO_NUM;
  config.pin_d6 = Y8_GPIO_NUM;
  config.pin_d7 = Y9_GPIO_NUM;
  config.pin_xclk = XCLK_GPIO_NUM;
  config.pin_pclk = PCLK_GPIO_NUM;
  config.pin_vsync = VSYNC_GPIO_NUM;
  config.pin_href = HREF_GPIO_NUM;
  config.pin_sscb_sda = SIOD_GPIO_NUM;
  config.pin_sscb_scl = SIOC_GPIO_NUM;
  config.pin_pwdn = PWDN_GPIO_NUM;
  config.pin_reset = RESET_GPIO_NUM;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG;

  // if PSRAM IC present, init with UXGA resolution and higher JPEG quality for larger pre-allocated frame buffer.
  if(psramFound()){
    config.frame_size = FRAMESIZE_UXGA;
    config.jpeg_quality = 10;
    config.fb_count = 2;
  } else {
    config.frame_size = FRAMESIZE_SVGA;
    config.jpeg_quality = 12;
    config.fb_count = 1;
  }

  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x\n", err);
    return;
  }
  Serial.println(F("Initialized Camera"));

  sensor_t * s = esp_camera_sensor_get();
  // initial sensors are flipped vertically and colors are a bit saturated
  if (s->id.PID == OV3660_PID) {
    s->set_vflip(s, 1);         // flip it back
    s->set_brightness(s, 1);    // up the brightness just a bit
    s->set_saturation(s, -2);   // lower the saturation
  }
  s->set_framesize(s, FRAMESIZE_QVGA);    // drop down frame size for higher initial frame rate
  Serial.println(F("Adjusted Camera Settings"));

  // to use DMA buffer, use these methods to allocate buffer
  spi_slave_tx_buf = slave.allocDMABuffer(BUFFER_SIZE);
  spi_slave_rx_buf = slave.allocDMABuffer(BUFFER_SIZE);
  memset(spi_slave_tx_buf, 0, BUFFER_SIZE);
  memset(spi_slave_rx_buf, 0, BUFFER_SIZE);

  slave.setDataMode(SPI_MODE0);
  slave.setMaxTransferSize(BUFFER_SIZE);
  slave.setDMAChannel(2); // 1 or 2 only
  slave.setQueueSize(1); // transaction queue size

  // begin() after setting
  // HSPI = CS: 15, CLK: 14, MOSI: 13, MISO: 12
  slave.begin(); // default SPI is HSPI

  digitalWrite(PIN_FLASH, HIGH);
  Serial.println(F("Taking a picture..."));    // Take a picture with the camera
  fb = esp_camera_fb_get();
  if (fb) {
    Serial.printf("Took a picture, %dx%d, %dbytes\n", fb->width, fb->height, fb->len);
  } else {
    Serial.println("Camera capture failed");          
  }
  digitalWrite(PIN_FLASH, LOW);
  esp_camera_fb_return(fb);

}

void loop() {
}

I tried to decrease the BUFFER_SIZE, but no luck:

--- Available filters and text transformations: colorize, debug, default, direct, esp32_exception_decoder, hexlify, log2file, nocontrol, printable, send_on_enter, time--- More details at http://bit.ly/pio-monitor-filters
--- Miniterm on COM3  115200,8,N,1 ---
--- Quit: Ctrl+C | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
ets Jun  8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5828
entry 0x400806a8
Initialized Camera
Adjusted Camera Settings
Taking a picture...
[E][camera.c:1483] esp_camera_fb_get(): Failed to get the frame on time!
Camera capture failed

Please help! :)