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  • #include "ns_camera.h"
  • #include "ArducamCamera.h"
  • #include "arm_math.h"
  • #include "jpeg-decoder/jpeg_decoder.h"
  • #include "jpeg-decoder/picojpeg.h"
  • #include "ns_spi.h"
  • #include "ns_ambiqsuite_harness.h"

Public Attributes

Type Name
ArducamCamera camera
jpeg_decoder_context_t jpegCtx = = {}
bool nsCameraPictureBeingTaken = = false
const ns_core_api_t ns_camera_V1_0_0 = = {.apiId = NS_CAMERA_API_ID, .version = NS_CAMERA_V1_0_0}
ns_camera_config_t ns_camera_config
const ns_core_api_t ns_camera_current_version = = {
.apiId = NS_CAMERA_API_ID, .version = NS_CAMERA_V1_0_0}
const ns_core_api_t ns_camera_oldest_supported_version = = {
.apiId = NS_CAMERA_API_ID, .version = NS_CAMERA_V1_0_0}
bool ns_read_done = = false
ns_spi_config_t * spiHandle = = NULL
ns_timer_config_t timerCfg = = {
.api = &ns_timer_V1_0_0,
.timer = NS_TIMER_INTERRUPT,
.enableInterrupt = true,
.periodInMicroseconds = 80000,
.callback = ns_camera_check_picture_completion,
}

Public Static Attributes

Type Name
uint8_t * dma_cambuf
uint32_t dma_current_chunk_length
uint32_t dma_offset
uint32_t dma_total_requested_length

Public Functions

Type Name
void arducam_delay_ms (uint16_t delay)
void arducam_delay_us (uint16_t delay)
int arducam_spi_read (const void * buf, uint32_t bufLen, uint64_t reg, uint32_t regLen, uint32_t csPin)
int arducam_spi_write (const void * buf, uint32_t bufLen, uint64_t reg, uint32_t regLen, uint32_t csPin)
int camera_decode_image (uint8_t * camBuf, uint32_t camLen, uint8_t * imgBuf, uint32_t imgWidth, uint32_t imgHeight, uint32_t scaleFactor)
Decode a JPEG image from the camera buffer to RGB565 buffer.
void ns_camera_adjust_settings (int8_t contrast, int8_t brightness, int8_t ev)
Adjust camera settings.
uint32_t ns_camera_capture (ns_camera_config_t * cfg, uint8_t * camBuf, uint32_t bufLen)
Convenience routine to capture and transfer next frame.
void ns_camera_check_picture_completion (ns_timer_config_t * timer)
uint32_t ns_camera_init (ns_camera_config_t * cfg)
Initialize the camera.
uint32_t ns_chop_off_trailing_zeros (uint8_t * buff, uint32_t length)
Chop off trailing zeros from a buffer.
int ns_is_camera_capturing ()
Check if camera is still capturing This is a helper function, it should typically only be used by ns_camera.
uint32_t ns_press_shutter_button (ns_camera_config_t * cfg)
Press the shutter button Start the capture process, turns on a timer to poll the camera for completion.
uint32_t ns_read_buff (ArducamCamera * camera, uint8_t * buff, uint32_t length)
void ns_rgb565_to_rgb888 (uint16_t rgb565Pixel, uint8_t * r, uint8_t * g, uint8_t * b)
uint32_t ns_start_camera (ns_camera_config_t * cfg)
Start the camera (take out of low power mode)
uint32_t ns_start_dma_read (ns_camera_config_t * cfg, uint8_t * camBuf, uint32_t * buffer_offset, uint32_t bufLen)
Start a DMA read of the camera buffer.
uint32_t ns_stop_camera (ns_camera_config_t * cfg)
Stop the camera (put into low power mode)
uint32_t ns_take_picture (ns_camera_config_t * cfg)
Take a picture in mode specified by cfg Once picture is taken, it can be transferred using ns_transfer_picture.
uint32_t ns_transfer_picture (ns_camera_config_t * cfg, uint8_t * camBuf, uint32_t * buffer_offset, uint32_t bufLen)
Transfer captured frame over SPI to local buffer NOTE: This routine is blocking and will wait for inflight capture.

Public Static Functions

Type Name
void ns_camera_buff_read_done (ns_spi_config_t * cfg)
uint8_t ns_mapCameraValuesToArducamScale (int8_t in)

Macros

Type Name
define ARDU_BURST_FIFO_READ 0x3C
define MAX_SPI_BUF_LEN 64
define MAX_SPI_DMA_LEN 4095
define NS_CAMERA_ARDUCHIP_TRIG 0x44
define NS_CAMERA_CAP_DONE_MASK 0x04
define NS_CAMERA_SHUTTER_MASK 0x02
define NS_CAMERA_VSYNC_MASK 0x01
define NS_CAM_REG_CAPTURE_RESOLUTION 0X21
define NS_CAM_REG_FORMAT 0X20
define NS_CAM_SET_CAPTURE_MODE (0 << 7)

Public Attributes Documentation

variable camera

ArducamCamera camera;

variable jpegCtx

jpeg_decoder_context_t jpegCtx;

variable nsCameraPictureBeingTaken

bool nsCameraPictureBeingTaken;

variable ns_camera_V1_0_0

const ns_core_api_t ns_camera_V1_0_0;

variable ns_camera_config

ns_camera_config_t ns_camera_config;

variable ns_camera_current_version

const ns_core_api_t ns_camera_current_version;

variable ns_camera_oldest_supported_version

const ns_core_api_t ns_camera_oldest_supported_version;

variable ns_read_done

bool ns_read_done;

variable spiHandle

ns_spi_config_t* spiHandle;

variable timerCfg

ns_timer_config_t timerCfg;

Public Static Attributes Documentation

variable dma_cambuf

uint8_t* dma_cambuf;

variable dma_current_chunk_length

uint32_t dma_current_chunk_length;

variable dma_offset

uint32_t dma_offset;

variable dma_total_requested_length

uint32_t dma_total_requested_length;

Public Functions Documentation

function arducam_delay_ms

void arducam_delay_ms (
    uint16_t delay
)

function arducam_delay_us

void arducam_delay_us (
    uint16_t delay
)

function arducam_spi_read

int arducam_spi_read (
    const void * buf,
    uint32_t bufLen,
    uint64_t reg,
    uint32_t regLen,
    uint32_t csPin
)

function arducam_spi_write

int arducam_spi_write (
    const void * buf,
    uint32_t bufLen,
    uint64_t reg,
    uint32_t regLen,
    uint32_t csPin
)

function camera_decode_image

Decode a JPEG image from the camera buffer to RGB565 buffer. 

int camera_decode_image (
    uint8_t * camBuf,
    uint32_t camLen,
    uint8_t * imgBuf,
    uint32_t imgWidth,
    uint32_t imgHeight,
    uint32_t scaleFactor
)

Converts a JPG to an RGB565 image.

Parameters:

  • camBuf Camera buffer to decode
  • camLen Length of camera buffer
  • imgBuf Image buffer to store decoded image
  • imgWidth Width of image
  • imgHeight Height of image
  • scaleFactor Scale factor for image

Returns:

int

function ns_camera_adjust_settings

Adjust camera settings. 

void ns_camera_adjust_settings (
    int8_t contrast,
    int8_t brightness,
    int8_t ev
)

Parameters:

  • contrast
  • brightness
  • ev

function ns_camera_capture

Convenience routine to capture and transfer next frame. 

uint32_t ns_camera_capture (
    ns_camera_config_t * cfg,
    uint8_t * camBuf,
    uint32_t bufLen
)

Parameters:

  • camBuf Camera buffer to store frame
  • bufLen Buffer size

Returns:

uint32_t

function ns_camera_check_picture_completion

void ns_camera_check_picture_completion (
    ns_timer_config_t * timer
)

function ns_camera_init

Initialize the camera. 

uint32_t ns_camera_init (
    ns_camera_config_t * cfg
)

Parameters:

  • cfg

Returns:

uint32_t

function ns_chop_off_trailing_zeros

Chop off trailing zeros from a buffer. 

uint32_t ns_chop_off_trailing_zeros (
    uint8_t * buff,
    uint32_t length
)

Parameters:

  • buff JPG buffer
  • length Adjusted length after trailing zeros are removed

Returns:

uint32_t

function ns_is_camera_capturing

Check if camera is still capturing This is a helper function, it should typically only be used by ns_camera. 

int ns_is_camera_capturing ()

Returns:

int

function ns_press_shutter_button

Press the shutter button Start the capture process, turns on a timer to poll the camera for completion. 

uint32_t ns_press_shutter_button (
    ns_camera_config_t * cfg
)

Parameters:

  • cfg

Returns:

uint32_t

function ns_read_buff

uint32_t ns_read_buff (
    ArducamCamera * camera,
    uint8_t * buff,
    uint32_t length
)

function ns_rgb565_to_rgb888

void ns_rgb565_to_rgb888 (
    uint16_t rgb565Pixel,
    uint8_t * r,
    uint8_t * g,
    uint8_t * b
)

function ns_start_camera

Start the camera (take out of low power mode) 

uint32_t ns_start_camera (
    ns_camera_config_t * cfg
)

Parameters:

  • cfg

Returns:

uint32_t

function ns_start_dma_read

Start a DMA read of the camera buffer. 

uint32_t ns_start_dma_read (
    ns_camera_config_t * cfg,
    uint8_t * camBuf,
    uint32_t * buffer_offset,
    uint32_t bufLen
)

Parameters:

  • cfg
  • camBuf Buffer to store image
  • buffer_offset Returned value of buffer offset
  • bufLen Length of buffer

Returns:

uint32_t Total size of image in bytes

function ns_stop_camera

Stop the camera (put into low power mode) 

uint32_t ns_stop_camera (
    ns_camera_config_t * cfg
)

Parameters:

  • cfg

Returns:

uint32_t

function ns_take_picture

Take a picture in mode specified by cfg Once picture is taken, it can be transferred using ns_transfer_picture. 

uint32_t ns_take_picture (
    ns_camera_config_t * cfg
)

Parameters:

  • cfg

Returns:

uint32_t

function ns_transfer_picture

Transfer captured frame over SPI to local buffer NOTE: This routine is blocking and will wait for inflight capture. 

uint32_t ns_transfer_picture (
    ns_camera_config_t * cfg,
    uint8_t * camBuf,
    uint32_t * buffer_offset,
    uint32_t bufLen
)

Parameters:

  • cfg
  • camBuf Camera buffer to store frame
  • buffer_offset JPG images are stored 1 byte offset from start of buffer, so use this to find it
  • bufLen Buffer size

Returns:

uint32_t

Public Static Functions Documentation

function ns_camera_buff_read_done

static void ns_camera_buff_read_done (
    ns_spi_config_t * cfg
)

function ns_mapCameraValuesToArducamScale

static uint8_t ns_mapCameraValuesToArducamScale (
    int8_t in
)

Macro Definition Documentation

define ARDU_BURST_FIFO_READ

#define ARDU_BURST_FIFO_READ 0x3C

define MAX_SPI_BUF_LEN

#define MAX_SPI_BUF_LEN 64

define MAX_SPI_DMA_LEN

#define MAX_SPI_DMA_LEN 4095

define NS_CAMERA_ARDUCHIP_TRIG

#define NS_CAMERA_ARDUCHIP_TRIG 0x44

define NS_CAMERA_CAP_DONE_MASK

#define NS_CAMERA_CAP_DONE_MASK 0x04

define NS_CAMERA_SHUTTER_MASK

#define NS_CAMERA_SHUTTER_MASK 0x02

define NS_CAMERA_VSYNC_MASK

#define NS_CAMERA_VSYNC_MASK 0x01

define NS_CAM_REG_CAPTURE_RESOLUTION

#define NS_CAM_REG_CAPTURE_RESOLUTION 0X21

define NS_CAM_REG_FORMAT

#define NS_CAM_REG_FORMAT 0X20

define NS_CAM_SET_CAPTURE_MODE

#define NS_CAM_SET_CAPTURE_MODE (0 << 7)

The documentation for this class was generated from the following file neuralSPOT/neuralspot/ns-camera/src/ns_camera.c