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esp32-camera/driver/camera.c

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "time.h"
#include "sys/time.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "rom/lldesc.h"
#include "soc/soc.h"
#include "soc/gpio_sig_map.h"
#include "soc/i2s_reg.h"
#include "soc/i2s_struct.h"
#include "soc/io_mux_reg.h"
#include "driver/gpio.h"
#include "driver/rtc_io.h"
#include "driver/periph_ctrl.h"
#include "esp_intr_alloc.h"
#include "sensor.h"
#include "sccb.h"
#include "esp_camera.h"
#include "camera_common.h"
#include "xclk.h"
#if CONFIG_OV2640_SUPPORT
#include "ov2640.h"
#endif
#if CONFIG_OV7725_SUPPORT
#include "ov7725.h"
#endif
typedef enum {
CAMERA_NONE = 0,
CAMERA_UNKNOWN = 1,
CAMERA_OV7725 = 7725,
CAMERA_OV2640 = 2640,
} camera_model_t;
#define REG_PID 0x0A
#define REG_VER 0x0B
#define REG_MIDH 0x1C
#define REG_MIDL 0x1D
#if defined(ARDUINO_ARCH_ESP32) && defined(CONFIG_ARDUHAL_ESP_LOG)
#include "esp32-hal-log.h"
#define TAG ""
#else
#include "esp_log.h"
static const char* TAG = "camera";
#endif
typedef void (*dma_filter_t)(const dma_elem_t* src, lldesc_t* dma_desc, uint8_t* dst);
typedef struct camera_fb_s {
uint8_t * buf;
size_t len;
size_t width;
size_t height;
pixformat_t format;
size_t size;
uint8_t ref;
struct camera_fb_s * next;
} camera_fb_int_t;
typedef struct fb_s {
uint8_t * buf;
size_t len;
struct fb_s * next;
} fb_item_t;
typedef struct {
camera_config_t config;
sensor_t sensor;
camera_fb_int_t *fb;
size_t fb_size;
size_t data_size;
size_t width;
size_t height;
size_t in_bytes_per_pixel;
size_t fb_bytes_per_pixel;
size_t dma_received_count;
size_t dma_filtered_count;
size_t dma_per_line;
size_t dma_buf_width;
size_t dma_sample_count;
lldesc_t *dma_desc;
dma_elem_t **dma_buf;
size_t dma_desc_count;
size_t dma_desc_cur;
i2s_sampling_mode_t sampling_mode;
dma_filter_t dma_filter;
intr_handle_t i2s_intr_handle;
QueueHandle_t data_ready;
QueueHandle_t fb_in;
QueueHandle_t fb_out;
SemaphoreHandle_t frame_ready;
TaskHandle_t dma_filter_task;
} camera_state_t;
camera_state_t* s_state = NULL;
static bool first_vsync = true;
static void i2s_init();
static void i2s_run();
static void IRAM_ATTR vsync_isr(void* arg);
static void IRAM_ATTR i2s_isr(void* arg);
static esp_err_t dma_desc_init();
static void dma_desc_deinit();
static void dma_filter_task(void *pvParameters);
static void dma_filter_grayscale(const dma_elem_t* src, lldesc_t* dma_desc, uint8_t* dst);
static void dma_filter_grayscale_highspeed(const dma_elem_t* src, lldesc_t* dma_desc, uint8_t* dst);
static void dma_filter_yuyv(const dma_elem_t* src, lldesc_t* dma_desc, uint8_t* dst);
static void dma_filter_yuyv_highspeed(const dma_elem_t* src, lldesc_t* dma_desc, uint8_t* dst);
static void dma_filter_jpeg(const dma_elem_t* src, lldesc_t* dma_desc, uint8_t* dst);
static void i2s_stop(bool* need_yield);
static bool is_hs_mode()
{
return s_state->config.xclk_freq_hz > 10000000;
}
static size_t i2s_bytes_per_sample(i2s_sampling_mode_t mode)
{
switch(mode) {
case SM_0A00_0B00:
return 4;
case SM_0A0B_0B0C:
return 4;
case SM_0A0B_0C0D:
return 2;
default:
assert(0 && "invalid sampling mode");
return 0;
}
}
static void IRAM_ATTR vsync_intr_disable()
{
gpio_set_intr_type(s_state->config.pin_vsync, GPIO_INTR_DISABLE);
}
static void vsync_intr_enable()
{
gpio_set_intr_type(s_state->config.pin_vsync, GPIO_INTR_NEGEDGE);
}
static void skip_frame()
{
if (s_state == NULL) {
return;
}
while (gpio_get_level(s_state->config.pin_vsync) == 0) {
;
}
while (gpio_get_level(s_state->config.pin_vsync) != 0) {
;
}
while (gpio_get_level(s_state->config.pin_vsync) == 0) {
;
}
}
static void camera_fb_deinit()
{
camera_fb_int_t * _fb1 = s_state->fb, * _fb2 = NULL;
while(s_state->fb) {
_fb2 = s_state->fb;
s_state->fb = _fb2->next;
if(_fb2->next == _fb1) {
s_state->fb = NULL;
}
free(_fb2->buf);
free(_fb2);
}
}
static esp_err_t camera_fb_init(size_t count)
{
if(!count) {
return ESP_ERR_INVALID_ARG;
}
camera_fb_deinit();
ESP_LOGI(TAG, "Allocating %u frame buffers (%d KB total)", count, (s_state->fb_size * count) / 1024);
camera_fb_int_t * _fb = NULL, * _fb1 = NULL, * _fb2 = NULL;
for(size_t i = 0; i < count; i++) {
_fb2 = (camera_fb_int_t *)malloc(sizeof(camera_fb_int_t));
if(!_fb2) {
goto fail;
}
memset(_fb2, 0, sizeof(camera_fb_int_t));
_fb2->size = s_state->fb_size;
if(s_state->config.pixel_format == PIXFORMAT_JPEG) {
_fb2->buf = (uint8_t*) calloc(_fb2->size, 1);
}
if(!_fb2->buf) {
ESP_LOGI(TAG, "Allocating %d KB frame buffer in PSRAM", s_state->fb_size/1024);
_fb2->buf = (uint8_t*) heap_caps_calloc(_fb2->size, 1, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
} else {
ESP_LOGI(TAG, "Allocating %d KB frame buffer in OnBoard RAM", s_state->fb_size/1024);
}
if(!_fb2->buf) {
free(_fb2);
ESP_LOGE(TAG, "Allocating %d KB frame buffer Failed", s_state->fb_size/1024);
goto fail;
}
memset(_fb2->buf, 0, _fb2->size);
_fb2->next = _fb;
_fb = _fb2;
if(!i) {
_fb1 = _fb2;
}
}
if(_fb1) {
_fb1->next = _fb;
}
s_state->fb = _fb;//load first buffer
return ESP_OK;
fail:
while(_fb) {
_fb2 = _fb;
_fb = _fb->next;
free(_fb2->buf);
free(_fb2);
}
return ESP_ERR_NO_MEM;
}
static esp_err_t dma_desc_init()
{
assert(s_state->width % 4 == 0);
size_t line_size = s_state->width * s_state->in_bytes_per_pixel *
i2s_bytes_per_sample(s_state->sampling_mode);
ESP_LOGD(TAG, "Line width (for DMA): %d bytes", line_size);
size_t dma_per_line = 1;
size_t buf_size = line_size;
while (buf_size >= 4096) {
buf_size /= 2;
dma_per_line *= 2;
}
size_t dma_desc_count = dma_per_line * 4;
s_state->dma_buf_width = line_size;
s_state->dma_per_line = dma_per_line;
s_state->dma_desc_count = dma_desc_count;
ESP_LOGD(TAG, "DMA buffer size: %d, DMA buffers per line: %d", buf_size, dma_per_line);
ESP_LOGD(TAG, "DMA buffer count: %d", dma_desc_count);
ESP_LOGD(TAG, "DMA buffer total: %d bytes", buf_size * dma_desc_count);
s_state->dma_buf = (dma_elem_t**) malloc(sizeof(dma_elem_t*) * dma_desc_count);
if (s_state->dma_buf == NULL) {
return ESP_ERR_NO_MEM;
}
s_state->dma_desc = (lldesc_t*) malloc(sizeof(lldesc_t) * dma_desc_count);
if (s_state->dma_desc == NULL) {
return ESP_ERR_NO_MEM;
}
size_t dma_sample_count = 0;
for (int i = 0; i < dma_desc_count; ++i) {
ESP_LOGD(TAG, "Allocating DMA buffer #%d, size=%d", i, buf_size);
dma_elem_t* buf = (dma_elem_t*) malloc(buf_size);
if (buf == NULL) {
return ESP_ERR_NO_MEM;
}
s_state->dma_buf[i] = buf;
ESP_LOGV(TAG, "dma_buf[%d]=%p", i, buf);
lldesc_t* pd = &s_state->dma_desc[i];
pd->length = buf_size;
if (s_state->sampling_mode == SM_0A0B_0B0C &&
(i + 1) % dma_per_line == 0) {
pd->length -= 4;
}
dma_sample_count += pd->length / 4;
pd->size = pd->length;
pd->owner = 1;
pd->sosf = 1;
pd->buf = (uint8_t*) buf;
pd->offset = 0;
pd->empty = 0;
pd->eof = 1;
pd->qe.stqe_next = &s_state->dma_desc[(i + 1) % dma_desc_count];
}
s_state->dma_sample_count = dma_sample_count;
return ESP_OK;
}
static void dma_desc_deinit()
{
if (s_state->dma_buf) {
for (int i = 0; i < s_state->dma_desc_count; ++i) {
free(s_state->dma_buf[i]);
}
}
free(s_state->dma_buf);
free(s_state->dma_desc);
}
static inline void IRAM_ATTR i2s_conf_reset()
{
const uint32_t lc_conf_reset_flags = I2S_IN_RST_M | I2S_AHBM_RST_M
| I2S_AHBM_FIFO_RST_M;
I2S0.lc_conf.val |= lc_conf_reset_flags;
I2S0.lc_conf.val &= ~lc_conf_reset_flags;
const uint32_t conf_reset_flags = I2S_RX_RESET_M | I2S_RX_FIFO_RESET_M
| I2S_TX_RESET_M | I2S_TX_FIFO_RESET_M;
I2S0.conf.val |= conf_reset_flags;
I2S0.conf.val &= ~conf_reset_flags;
while (I2S0.state.rx_fifo_reset_back) {
;
}
}
static void i2s_init()
{
camera_config_t* config = &s_state->config;
// Configure input GPIOs
gpio_num_t pins[] = {
config->pin_d7,
config->pin_d6,
config->pin_d5,
config->pin_d4,
config->pin_d3,
config->pin_d2,
config->pin_d1,
config->pin_d0,
config->pin_vsync,
config->pin_href,
config->pin_pclk
};
gpio_config_t conf = {
.mode = GPIO_MODE_INPUT,
.pull_up_en = GPIO_PULLUP_ENABLE,
.pull_down_en = GPIO_PULLDOWN_DISABLE,
.intr_type = GPIO_INTR_DISABLE
};
for (int i = 0; i < sizeof(pins) / sizeof(gpio_num_t); ++i) {
if (rtc_gpio_is_valid_gpio(pins[i])) {
rtc_gpio_deinit(pins[i]);
}
conf.pin_bit_mask = 1LL << pins[i];
gpio_config(&conf);
}
// Route input GPIOs to I2S peripheral using GPIO matrix
gpio_matrix_in(config->pin_d0, I2S0I_DATA_IN0_IDX, false);
gpio_matrix_in(config->pin_d1, I2S0I_DATA_IN1_IDX, false);
gpio_matrix_in(config->pin_d2, I2S0I_DATA_IN2_IDX, false);
gpio_matrix_in(config->pin_d3, I2S0I_DATA_IN3_IDX, false);
gpio_matrix_in(config->pin_d4, I2S0I_DATA_IN4_IDX, false);
gpio_matrix_in(config->pin_d5, I2S0I_DATA_IN5_IDX, false);
gpio_matrix_in(config->pin_d6, I2S0I_DATA_IN6_IDX, false);
gpio_matrix_in(config->pin_d7, I2S0I_DATA_IN7_IDX, false);
gpio_matrix_in(config->pin_vsync, I2S0I_V_SYNC_IDX, false);
gpio_matrix_in(0x38, I2S0I_H_SYNC_IDX, false);
gpio_matrix_in(config->pin_href, I2S0I_H_ENABLE_IDX, false);
gpio_matrix_in(config->pin_pclk, I2S0I_WS_IN_IDX, false);
// Enable and configure I2S peripheral
periph_module_enable(PERIPH_I2S0_MODULE);
// Toggle some reset bits in LC_CONF register
// Toggle some reset bits in CONF register
i2s_conf_reset();
// Enable slave mode (sampling clock is external)
I2S0.conf.rx_slave_mod = 1;
// Enable parallel mode
I2S0.conf2.lcd_en = 1;
// Use HSYNC/VSYNC/HREF to control sampling
I2S0.conf2.camera_en = 1;
// Configure clock divider
I2S0.clkm_conf.clkm_div_a = 1;
I2S0.clkm_conf.clkm_div_b = 0;
I2S0.clkm_conf.clkm_div_num = 2;
// FIFO will sink data to DMA
I2S0.fifo_conf.dscr_en = 1;
// FIFO configuration
I2S0.fifo_conf.rx_fifo_mod = s_state->sampling_mode;
I2S0.fifo_conf.rx_fifo_mod_force_en = 1;
I2S0.conf_chan.rx_chan_mod = 1;
// Clear flags which are used in I2S serial mode
I2S0.sample_rate_conf.rx_bits_mod = 0;
I2S0.conf.rx_right_first = 0;
I2S0.conf.rx_msb_right = 0;
I2S0.conf.rx_msb_shift = 0;
I2S0.conf.rx_mono = 0;
I2S0.conf.rx_short_sync = 0;
I2S0.timing.val = 0;
I2S0.timing.rx_dsync_sw = 1;
// Allocate I2S interrupt, keep it disabled
esp_intr_alloc(ETS_I2S0_INTR_SOURCE,
ESP_INTR_FLAG_INTRDISABLED | ESP_INTR_FLAG_LEVEL1 | ESP_INTR_FLAG_IRAM,
&i2s_isr, NULL, &s_state->i2s_intr_handle);
}
static void i2s_run()
{
for (int i = 0; i < s_state->dma_desc_count; ++i) {
lldesc_t* d = &s_state->dma_desc[i];
ESP_LOGV(TAG, "DMA desc %2d: %u %u %u %u %u %u %p %p",
i, d->length, d->size, d->offset, d->eof, d->sosf, d->owner, d->buf, d->qe.stqe_next);
memset(s_state->dma_buf[i], 0, d->length);
}
// wait for frame
camera_fb_int_t * fb = s_state->fb;
while(s_state->config.fb_count > 1) {
while(s_state->fb->ref && s_state->fb->next != fb) {
s_state->fb = s_state->fb->next;
}
if(s_state->fb->ref == 0) {
break;
}
vTaskDelay(2);
}
// wait for vsync
ESP_LOGV(TAG, "Waiting for negative edge on VSYNC");
while (gpio_get_level(s_state->config.pin_vsync) != 0) {
;
}
ESP_LOGV(TAG, "Got VSYNC");
s_state->dma_desc_cur = 0;
s_state->dma_received_count = 0;
//s_state->dma_filtered_count = 0;
esp_intr_disable(s_state->i2s_intr_handle);
i2s_conf_reset();
I2S0.rx_eof_num = s_state->dma_sample_count;
I2S0.in_link.addr = (uint32_t) &s_state->dma_desc[0];
I2S0.in_link.start = 1;
I2S0.int_clr.val = I2S0.int_raw.val;
I2S0.int_ena.val = 0;
I2S0.int_ena.in_done = 1;
esp_intr_enable(s_state->i2s_intr_handle);
I2S0.conf.rx_start = 1;
if (s_state->config.pixel_format == PIXFORMAT_JPEG) {
first_vsync = true;
vsync_intr_enable();
}
}
static void IRAM_ATTR i2s_stop_bus()
{
esp_intr_disable(s_state->i2s_intr_handle);
vsync_intr_disable();
i2s_conf_reset();
I2S0.conf.rx_start = 0;
}
static void IRAM_ATTR i2s_stop(bool* need_yield)
{
if(s_state->config.fb_count == 1) {
i2s_stop_bus();
} else {
s_state->dma_received_count = 0;
}
size_t val = SIZE_MAX;
BaseType_t higher_priority_task_woken;
BaseType_t ret = xQueueSendFromISR(s_state->data_ready, &val, &higher_priority_task_woken);
if(need_yield && !*need_yield) {
*need_yield = (ret == pdTRUE && higher_priority_task_woken == pdTRUE);
}
}
static void IRAM_ATTR signal_dma_buf_received(bool* need_yield)
{
size_t dma_desc_filled = s_state->dma_desc_cur;
s_state->dma_desc_cur = (dma_desc_filled + 1) % s_state->dma_desc_count;
s_state->dma_received_count++;
BaseType_t higher_priority_task_woken;
BaseType_t ret = xQueueSendFromISR(s_state->data_ready, &dma_desc_filled, &higher_priority_task_woken);
if (ret != pdTRUE) {
ESP_EARLY_LOGV(TAG, "queue send failed (%d), dma_received_count=%d", ret, s_state->dma_received_count);
ets_printf("qf: %d\n", s_state->dma_received_count);
}
*need_yield = (ret == pdTRUE && higher_priority_task_woken == pdTRUE);
}
static void IRAM_ATTR i2s_isr(void* arg)
{
I2S0.int_clr.val = I2S0.int_raw.val;
bool need_yield = false;
signal_dma_buf_received(&need_yield);
if (s_state->config.pixel_format != PIXFORMAT_JPEG
&& s_state->dma_received_count == s_state->height * s_state->dma_per_line) {
//ets_printf("end_enough\n");
i2s_stop(&need_yield);
}
if (need_yield) {
portYIELD_FROM_ISR();
}
}
static void IRAM_ATTR vsync_isr(void* arg)
{
GPIO.status1_w1tc.val = GPIO.status1.val;
GPIO.status_w1tc = GPIO.status;
bool need_yield = false;
//if vsync is low and we have received some data, frame is done
if (gpio_get_level(s_state->config.pin_vsync) == 0) {
if(s_state->dma_received_count > 0) {
signal_dma_buf_received(&need_yield);
//ets_printf("end_vsync\n");
if(s_state->dma_filtered_count > 1 || s_state->config.fb_count > 1) {
i2s_stop(&need_yield);
}
first_vsync = false;
}
if(s_state->config.fb_count > 1 || s_state->dma_filtered_count < 2) {
I2S0.conf.rx_start = 0;
I2S0.in_link.start = 0;
I2S0.int_clr.val = I2S0.int_raw.val;
i2s_conf_reset();
s_state->dma_desc_cur = (s_state->dma_desc_cur + 1) % s_state->dma_desc_count;
//I2S0.rx_eof_num = s_state->dma_sample_count;
I2S0.in_link.addr = (uint32_t) &s_state->dma_desc[s_state->dma_desc_cur];
I2S0.in_link.start = 1;
I2S0.conf.rx_start = 1;
s_state->dma_received_count = 0;
}
}
if (need_yield) {
portYIELD_FROM_ISR();
}
}
static void IRAM_ATTR camera_fb_done()
{
camera_fb_int_t * fb = NULL, * fb2 = NULL;
BaseType_t taskAwoken = 0;
fb = s_state->fb;
if(!fb->ref && fb->len) {
//add reference
fb->ref = 1;
//check if the queue is full
if(xQueueIsQueueFullFromISR(s_state->fb_out) == pdTRUE) {
//pop frame buffer from the queue
if(xQueueReceiveFromISR(s_state->fb_out, &fb2, &taskAwoken) == pdTRUE) {
//free the popped buffer
fb2->ref = 0;
fb2->len = 0;
//push the new frame to the end of the queue
xQueueSendFromISR(s_state->fb_out, &fb, &taskAwoken);
} else {
//queue is full and we could not pop a frame from it
}
} else {
//push the new frame to the end of the queue
xQueueSendFromISR(s_state->fb_out, &fb, &taskAwoken);
}
} else {
//frame was referenced or empty
}
//return buffers to be filled
while(xQueueReceiveFromISR(s_state->fb_in, &fb2, &taskAwoken) == pdTRUE) {
fb2->ref = 0;
fb2->len = 0;
}
//advance frame buffer only if the current one has data
if(s_state->fb->len) {
s_state->fb = s_state->fb->next;
}
//try to find the next free frame buffer
while(s_state->fb->ref && s_state->fb->next != fb) {
s_state->fb = s_state->fb->next;
}
//is the found frame buffer free?
if(!s_state->fb->ref) {
//buffer found. make sure it's empty
s_state->fb->len = 0;
*((uint32_t *)s_state->fb->buf) = 0;
} else {
//stay at the previous buffer
s_state->fb = fb;
}
}
static void IRAM_ATTR dma_filter_buffer(size_t buf_idx)
{
size_t buf_len = s_state->width * s_state->fb_bytes_per_pixel / s_state->dma_per_line;
if (buf_idx == SIZE_MAX) {
if(!s_state->fb->ref) {
s_state->fb->len = s_state->dma_filtered_count * buf_len;
}
if(s_state->fb->len) {
if(s_state->config.fb_count == 1) {
xSemaphoreGive(s_state->frame_ready);
} else {
camera_fb_done();
}
}
s_state->dma_filtered_count = 0;
return;
}
if(s_state->fb->ref) {
return;
}
const dma_elem_t* buf = s_state->dma_buf[buf_idx];
lldesc_t* desc = &s_state->dma_desc[buf_idx];
size_t fb_pos = s_state->dma_filtered_count * buf_len;
if(fb_pos > s_state->fb_size - buf_len) {
//size_t processed = s_state->dma_received_count * buf_len;
//ets_printf("[%s:%u] ovf pos: %u, processed: %u\n", __FUNCTION__, __LINE__, fb_pos, processed);
return;
}
uint8_t* pfb = s_state->fb->buf + fb_pos;
(*s_state->dma_filter)(buf, desc, pfb);
if(!s_state->dma_filtered_count) {
s_state->fb->width = resolution[s_state->sensor.framesize][0];
s_state->fb->height = resolution[s_state->sensor.framesize][1];
s_state->fb->format = s_state->sensor.pixformat;
}
if(s_state->config.pixel_format == PIXFORMAT_JPEG) {
if(!s_state->dma_filtered_count) { //first buffer
uint32_t sig = *((uint32_t *)s_state->fb->buf) & 0xFFFFFF;
if(sig != 0xffd8ff) {
//ets_printf("*");
//maybe skip frame?
return;
}
}
}
s_state->dma_filtered_count++;
}
static void IRAM_ATTR dma_filter_task(void *pvParameters)
{
s_state->dma_filtered_count = 0;
while (true) {
size_t buf_idx;
if(xQueueReceive(s_state->data_ready, &buf_idx, portMAX_DELAY) == pdTRUE) {
dma_filter_buffer(buf_idx);
}
}
}
static void IRAM_ATTR dma_filter_jpeg(const dma_elem_t* src, lldesc_t* dma_desc, uint8_t* dst)
{
size_t end = dma_desc->length / sizeof(dma_elem_t) / 4;
// manually unrolling 4 iterations of the loop here
for (size_t i = 0; i < end; ++i) {
dst[0] = src[0].sample1;
dst[1] = src[1].sample1;
dst[2] = src[2].sample1;
dst[3] = src[3].sample1;
src += 4;
dst += 4;
}
// the final sample of a line in SM_0A0B_0B0C sampling mode needs special handling
if ((dma_desc->length & 0x7) != 0) {
dst[0] = src[0].sample1;
dst[1] = src[1].sample1;
dst[2] = src[2].sample1;
dst[3] = src[2].sample2;
}
}
static void IRAM_ATTR dma_filter_grayscale(const dma_elem_t* src, lldesc_t* dma_desc, uint8_t* dst)
{
size_t end = dma_desc->length / sizeof(dma_elem_t) / 4;
for (size_t i = 0; i < end; ++i) {
// manually unrolling 4 iterations of the loop here
dst[0] = src[0].sample1;
dst[1] = src[1].sample1;
dst[2] = src[2].sample1;
dst[3] = src[3].sample1;
src += 4;
dst += 4;
}
}
static void IRAM_ATTR dma_filter_grayscale_highspeed(const dma_elem_t* src, lldesc_t* dma_desc, uint8_t* dst)
{
size_t end = dma_desc->length / sizeof(dma_elem_t) / 8;
for (size_t i = 0; i < end; ++i) {
// manually unrolling 4 iterations of the loop here
dst[0] = src[0].sample1;
dst[1] = src[2].sample1;
dst[2] = src[4].sample1;
dst[3] = src[6].sample1;
src += 8;
dst += 4;
}
// the final sample of a line in SM_0A0B_0B0C sampling mode needs special handling
if ((dma_desc->length & 0x7) != 0) {
dst[0] = src[0].sample1;
dst[1] = src[2].sample1;
}
}
static void IRAM_ATTR dma_filter_yuyv(const dma_elem_t* src, lldesc_t* dma_desc, uint8_t* dst)
{
size_t end = dma_desc->length / sizeof(dma_elem_t) / 4;
for (size_t i = 0; i < end; ++i) {
dst[0] = src[0].sample1;//y0
dst[1] = src[0].sample2;//u
dst[2] = src[1].sample1;//y1
dst[3] = src[1].sample2;//v
dst[4] = src[2].sample1;//y0
dst[5] = src[2].sample2;//u
dst[6] = src[3].sample1;//y1
dst[7] = src[3].sample2;//v
src += 4;
dst += 8;
}
}
static void IRAM_ATTR dma_filter_yuyv_highspeed(const dma_elem_t* src, lldesc_t* dma_desc, uint8_t* dst)
{
size_t end = dma_desc->length / sizeof(dma_elem_t) / 8;
for (size_t i = 0; i < end; ++i) {
dst[0] = src[0].sample1;//y0
dst[1] = src[1].sample1;//u
dst[2] = src[2].sample1;//y1
dst[3] = src[3].sample1;//v
dst[4] = src[4].sample1;//y0
dst[5] = src[5].sample1;//u
dst[6] = src[6].sample1;//y1
dst[7] = src[7].sample1;//v
src += 8;
dst += 8;
}
if ((dma_desc->length & 0x7) != 0) {
dst[0] = src[0].sample1;//y0
dst[1] = src[1].sample1;//u
dst[2] = src[2].sample1;//y1
dst[3] = src[2].sample2;//v
}
}
/*
* Public Methods
* */
esp_err_t camera_probe(const camera_config_t* config, camera_model_t* out_camera_model)
{
if (s_state != NULL) {
return ESP_ERR_INVALID_STATE;
}
s_state = (camera_state_t*) calloc(sizeof(*s_state), 1);
if (!s_state) {
return ESP_ERR_NO_MEM;
}
ESP_LOGD(TAG, "Enabling XCLK output");
camera_enable_out_clock(config);
ESP_LOGD(TAG, "Initializing SSCB");
SCCB_Init(config->pin_sscb_sda, config->pin_sscb_scl);
if(config->pin_reset >= 0) {
ESP_LOGD(TAG, "Resetting camera");
gpio_config_t conf = { 0 };
conf.pin_bit_mask = 1LL << config->pin_reset;
conf.mode = GPIO_MODE_OUTPUT;
gpio_config(&conf);
gpio_set_level(config->pin_reset, 0);
vTaskDelay(10 / portTICK_PERIOD_MS);
gpio_set_level(config->pin_reset, 1);
vTaskDelay(10 / portTICK_PERIOD_MS);
} else {
//reset OV2640
SCCB_Write(0x30, 0xFF, 0x01);//bank sensor
SCCB_Write(0x30, 0x12, 0x80);//reset
vTaskDelay(10 / portTICK_PERIOD_MS);
}
ESP_LOGD(TAG, "Searching for camera address");
vTaskDelay(10 / portTICK_PERIOD_MS);
uint8_t slv_addr = SCCB_Probe();
if (slv_addr == 0) {
*out_camera_model = CAMERA_NONE;
camera_disable_out_clock();
return ESP_ERR_CAMERA_NOT_DETECTED;
}
s_state->sensor.slv_addr = slv_addr;
//s_state->sensor.slv_addr = 0x30;
ESP_LOGD(TAG, "Detected camera at address=0x%02x", s_state->sensor.slv_addr);
sensor_id_t* id = &s_state->sensor.id;
id->PID = SCCB_Read(s_state->sensor.slv_addr, REG_PID);
id->VER = SCCB_Read(s_state->sensor.slv_addr, REG_VER);
id->MIDL = SCCB_Read(s_state->sensor.slv_addr, REG_MIDL);
id->MIDH = SCCB_Read(s_state->sensor.slv_addr, REG_MIDH);
vTaskDelay(10 / portTICK_PERIOD_MS);
ESP_LOGD(TAG, "Camera PID=0x%02x VER=0x%02x MIDL=0x%02x MIDH=0x%02x",
id->PID, id->VER, id->MIDH, id->MIDL);
switch (id->PID) {
#if CONFIG_OV2640_SUPPORT
case OV2640_PID:
*out_camera_model = CAMERA_OV2640;
ov2640_init(&s_state->sensor);
break;
#endif
#if CONFIG_OV7725_SUPPORT
case OV7725_PID:
*out_camera_model = CAMERA_OV7725;
ov7725_init(&s_state->sensor);
break;
#endif
default:
id->PID = 0;
*out_camera_model = CAMERA_UNKNOWN;
camera_disable_out_clock();
ESP_LOGE(TAG, "Detected camera not supported.");
return ESP_ERR_CAMERA_NOT_SUPPORTED;
}
ESP_LOGD(TAG, "Doing SW reset of sensor");
s_state->sensor.reset(&s_state->sensor);
return ESP_OK;
}
esp_err_t camera_init(const camera_config_t* config)
{
if (!s_state) {
return ESP_ERR_INVALID_STATE;
}
if (s_state->sensor.id.PID == 0) {
return ESP_ERR_CAMERA_NOT_SUPPORTED;
}
memcpy(&s_state->config, config, sizeof(*config));
esp_err_t err = ESP_OK;
framesize_t frame_size = (framesize_t) config->frame_size;
pixformat_t pix_format = (pixformat_t) config->pixel_format;
s_state->width = resolution[frame_size][0];
s_state->height = resolution[frame_size][1];
if (pix_format == PIXFORMAT_GRAYSCALE) {
s_state->fb_size = s_state->width * s_state->height;
if (is_hs_mode()) {
s_state->sampling_mode = SM_0A00_0B00;
s_state->dma_filter = &dma_filter_grayscale_highspeed;
} else {
s_state->sampling_mode = SM_0A0B_0C0D;
s_state->dma_filter = &dma_filter_grayscale;
}
s_state->in_bytes_per_pixel = 2; // camera sends YUYV
s_state->fb_bytes_per_pixel = 1; // frame buffer stores Y8
} else if (pix_format == PIXFORMAT_YUV422 || pix_format == PIXFORMAT_RGB565) {
s_state->fb_size = s_state->width * s_state->height * 2;
if (is_hs_mode()) {
s_state->sampling_mode = SM_0A00_0B00;
s_state->dma_filter = &dma_filter_yuyv_highspeed;
} else {
s_state->sampling_mode = SM_0A0B_0C0D;
s_state->dma_filter = &dma_filter_yuyv;
}
s_state->in_bytes_per_pixel = 2; // camera sends YUYV
s_state->fb_bytes_per_pixel = 2; // frame buffer stores Y8
} else if (pix_format == PIXFORMAT_JPEG) {
if (s_state->sensor.id.PID != OV2640_PID) {
ESP_LOGE(TAG, "JPEG format is only supported for ov2640");
err = ESP_ERR_NOT_SUPPORTED;
goto fail;
}
int qp = config->jpeg_quality;
int compression_ratio_bound = 1;
if (qp > 10) {
compression_ratio_bound = 16;
} else if (qp > 5) {
compression_ratio_bound = 10;
} else {
compression_ratio_bound = 4;
}
(*s_state->sensor.set_quality)(&s_state->sensor, qp);
s_state->in_bytes_per_pixel = 2;
s_state->fb_bytes_per_pixel = 2;
s_state->fb_size = (s_state->width * s_state->height * s_state->fb_bytes_per_pixel) / compression_ratio_bound;
s_state->dma_filter = &dma_filter_jpeg;
s_state->sampling_mode = SM_0A00_0B00;
} else {
ESP_LOGE(TAG, "Requested format is not supported");
err = ESP_ERR_NOT_SUPPORTED;
goto fail;
}
ESP_LOGD(TAG, "in_bpp: %d, fb_bpp: %d, fb_size: %d, mode: %d, width: %d height: %d",
s_state->in_bytes_per_pixel, s_state->fb_bytes_per_pixel,
s_state->fb_size, s_state->sampling_mode,
s_state->width, s_state->height);
i2s_init();
err = dma_desc_init();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to initialize I2S and DMA");
goto fail;
}
//s_state->fb_size = 75 * 1024;
err = camera_fb_init(s_state->config.fb_count);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to allocate frame buffer");
goto fail;
}
s_state->data_ready = xQueueCreate(16, sizeof(size_t));
if (s_state->data_ready == NULL) {
ESP_LOGE(TAG, "Failed to dma queue");
err = ESP_ERR_NO_MEM;
goto fail;
}
if(s_state->config.fb_count == 1) {
s_state->frame_ready = xSemaphoreCreateBinary();
if (s_state->frame_ready == NULL) {
ESP_LOGE(TAG, "Failed to create semaphore");
err = ESP_ERR_NO_MEM;
goto fail;
}
} else {
s_state->fb_in = xQueueCreate(s_state->config.fb_count, sizeof(camera_fb_t *));
s_state->fb_out = xQueueCreate(1, sizeof(camera_fb_t *));
if (s_state->fb_in == NULL || s_state->fb_out == NULL) {
ESP_LOGE(TAG, "Failed to fb queues");
err = ESP_ERR_NO_MEM;
goto fail;
}
}
//ToDo: core affinity?
if (!xTaskCreatePinnedToCore(&dma_filter_task, "dma_filter", 4096, NULL, 10, &s_state->dma_filter_task, 1)) {
ESP_LOGE(TAG, "Failed to create DMA filter task");
err = ESP_ERR_NO_MEM;
goto fail;
}
vsync_intr_disable();
gpio_install_isr_service(ESP_INTR_FLAG_LEVEL1 | ESP_INTR_FLAG_IRAM);
err = gpio_isr_handler_add(s_state->config.pin_vsync, &vsync_isr, NULL);
if (err != ESP_OK) {
ESP_LOGE(TAG, "vsync_isr_handler_add failed (%x)", err);
goto fail;
}
s_state->sensor.framesize = frame_size;
s_state->sensor.pixformat = pix_format;
ESP_LOGD(TAG, "Setting frame size to %dx%d", s_state->width, s_state->height);
if (s_state->sensor.set_framesize(&s_state->sensor, frame_size) != 0) {
ESP_LOGE(TAG, "Failed to set frame size");
err = ESP_ERR_CAMERA_FAILED_TO_SET_FRAME_SIZE;
goto fail;
}
s_state->sensor.set_pixformat(&s_state->sensor, pix_format);
if (s_state->sensor.id.PID == OV2640_PID) {
s_state->sensor.set_gainceiling(&s_state->sensor, GAINCEILING_2X);
s_state->sensor.set_bpc(&s_state->sensor, false);
s_state->sensor.set_wpc(&s_state->sensor, true);
s_state->sensor.set_lenc(&s_state->sensor, true);
}
skip_frame();
//for some reason the first set of the quality does not work.
if (pix_format == PIXFORMAT_JPEG) {
(*s_state->sensor.set_quality)(&s_state->sensor, config->jpeg_quality);
}
return ESP_OK;
fail:
esp_camera_deinit();
return err;
}
esp_err_t esp_camera_init(const camera_config_t* config)
{
camera_model_t camera_model = CAMERA_NONE;
esp_err_t err = camera_probe(config, &camera_model);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Camera probe failed with error 0x%x", err);
goto fail;
}
if (camera_model == CAMERA_OV7725) {
ESP_LOGD(TAG, "Detected OV7725 camera");
if(config->pixel_format == PIXFORMAT_JPEG) {
ESP_LOGE(TAG, "Camera does not support JPEG");
err = ESP_ERR_CAMERA_NOT_SUPPORTED;
goto fail;
}
} else if (camera_model == CAMERA_OV2640) {
ESP_LOGD(TAG, "Detected OV2640 camera");
} else {
ESP_LOGE(TAG, "Camera not supported");
err = ESP_ERR_CAMERA_NOT_SUPPORTED;
goto fail;
}
err = camera_init(config);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Camera init failed with error 0x%x", err);
return err;
}
return ESP_OK;
fail:
free(s_state);
s_state = NULL;
camera_disable_out_clock();
return err;
}
esp_err_t esp_camera_deinit()
{
if (s_state == NULL) {
return ESP_ERR_INVALID_STATE;
}
if (s_state->dma_filter_task) {
vTaskDelete(s_state->dma_filter_task);
}
if (s_state->data_ready) {
vQueueDelete(s_state->data_ready);
}
if (s_state->fb_in) {
vQueueDelete(s_state->fb_in);
}
if (s_state->fb_out) {
vQueueDelete(s_state->fb_out);
}
if (s_state->frame_ready) {
vSemaphoreDelete(s_state->frame_ready);
}
gpio_isr_handler_remove(s_state->config.pin_vsync);
if (s_state->i2s_intr_handle) {
esp_intr_disable(s_state->i2s_intr_handle);
esp_intr_free(s_state->i2s_intr_handle);
}
dma_desc_deinit();
camera_fb_deinit();
free(s_state);
s_state = NULL;
camera_disable_out_clock();
periph_module_disable(PERIPH_I2S0_MODULE);
return ESP_OK;
}
camera_fb_t* esp_camera_fb_get()
{
if (s_state == NULL) {
return NULL;
}
if(!I2S0.conf.rx_start) {
if(s_state->config.fb_count > 1) {
ESP_LOGD(TAG, "i2s_run");
}
i2s_run();
}
if(s_state->config.fb_count == 1) {
xSemaphoreTake(s_state->frame_ready, portMAX_DELAY);
}
if(s_state->config.fb_count == 1) {
return (camera_fb_t*)s_state->fb;
}
camera_fb_int_t * fb = NULL;
if(s_state->fb_out) {
xQueueReceive(s_state->fb_out, &fb, portMAX_DELAY);
}
return (camera_fb_t*)fb;
}
void esp_camera_fb_return(camera_fb_t * fb)
{
if(fb == NULL || s_state == NULL || s_state->config.fb_count == 1 || s_state->fb_in == NULL) {
return;
}
xQueueSend(s_state->fb_in, &fb, portMAX_DELAY);
}
sensor_t * esp_camera_sensor_get()
{
if (s_state == NULL) {
return NULL;
}
return &s_state->sensor;
}