Digital camera interface (DCMI) RM0390
430/1328 RM0390 Rev 4
15.4.5 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.
Figure 105. Frame capture waveforms in snapshot mode
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.
Continuous grab mode
In this mode (CM bit = ‘0’ in DCMI_CR), once the CAPTURE bit has been set in DCMI_CR,
the grabbing process starts on the next DCMI_VSYNC or embedded frame start depending
on the mode. The process continues until the CAPTURE bit is cleared in DCMI_CR. Once
the CAPTURE bit has been cleared, the grabbing process continues until the end of the
current frame.
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