Vehicle-mounted atmosphere lamp capable of generating return-to-zero code by utilizing DMA module

The utility model discloses a vehicle-mounted atmosphere lamp using a DMA module to generate a return-to-zero code, which comprises a micro-control unit, an output port and a DMA module, the output port is connected with an intelligent external control integrated light-emitting diode light source, the DMA module is provided with a direct memory access hardware module, the direct memory access hardware module is connected with a pulse width modulation driving module, and the pulse width modulation driving module is connected with the micro-control unit. The pulse width modulation driving module is connected with the output port, the micro-control unit sends original return-to-zero code data to the direct memory access hardware module, and the direct memory access hardware module sequentially sends the original return-to-zero code data to the pulse width modulation driving module. And the pulse width modulation driving module synthesizes the received original return-to-zero code data into duty cycle data, and s