Capture Modes; Figure 66. Frame Capture Waveforms In Snapshot Mode - ST STM32F40 Series Reference Manual

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This mode can be supported by programming the following codes:

LS ≤ SAV (active)

LE ≤ EAV (active)

An embedded unmask code is also implemented for frame/line start and frame/line end

codes. Using it, it is possible to compare only the selected unmasked bits with the

programmed code. You can therefore select a bit to compare in the embedded code and

detect a frame/line start or frame/line end. This means that there can be different codes for

the frame/line start and frame/line end with the unmasked bit position remaining the same.

Unmask code for FS = 0x10

In this case the frame start code is embedded in the bit 4 of the frame start code.

Capture modes

This interface supports two types of capture: snapshot (single frame) and continuous grab.

Snapshot mode (single frame)

In this mode, a single frame is captured (CM = '1' in the DCMI_CR register). After the

CAPTURE bit is set in DCMI_CR, the interface waits for the detection of a start of frame

before sampling the data. The camera interface is automatically disabled (CAPTURE bit

cleared in DCMI_CR) after receiving the first complete frame. An interrupt is generated

(IT_FRAME) if it is enabled.

In case of an overrun, the frame is lost and the CAPTURE bit is cleared.

1. Here, the active state of DCMI_HSYNC and DCMI_VSYNC is 1.

2. DCMI_HSYNC and DCMI_VSYNC can change states at the same time.

Doc ID 018909 Rev 4

Digital camera interface (DCMI)

Frame 1 captured

not captured

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