The only exception, for now, is multiplayer and music. all the levels of the three original episodes should work at the ultra-violence mode.
Bluetooth hack app full#
We want to be able to run the full commercial Doom, i.e.Now we have a quarter of MB, and a faster interface to the external flash, so we cannot keep our expectations low, even if this microcontroller has only 2/3 of the computing power we had previously.
Bluetooth hack app serial#
We have already shown that with less than an ninth of MB of RAM you can run Doom, and we stated that the performance limiting factors were the small RAM amount and the access speed to graphics data, stored on an external serial flash. Can we do better with the same MCU? By how much? The Challenge This was also a good reason to start our adventure.ĭespite this is not the first time Doom has been ported to the nRF52840, we wanted to tell our story. While this is “ok” for a proof of concept, the frame rate is not high enough for actual gameplay. This might explain why such low frame rate was achieved. Therefore, we assume that all the data was read directly from the SD card, which introduces quite a huge overhead, especially if a file system is used. This is not surprising, since from the published video we see that the bare nRF52840 dev-board was used, with no external QSPI flash. Furthermore, many textures, including the sky, were changed with a placeholder, probably due to memory and speed issues. In fact, by counting the frames on the video, we estimate a 3 to 5 fps value on level E1M1. However, by looking at their published video, the frame rate was very low. Then, it took us a single Google search to discover that the same employee also managed to “run” Doom on the nRF52840, as a proof of concept. From such high-end specs, in terms of DMIPS, RAM amount and QSPI speed, the achieved performance is quite expectable, even on a 320×200 display. The microcontroller also features a 96MHz QSPI interface, i.e data can be read at 48 MB/s. Still, the nRF5340 is an extremely powerful dual-core CM33 microcontroller: one core is clocked at 128 MHz and features 512kB of RAM + 1MB of flash, the other core runs at 64 MHz and has 256kB Flash and 64kB RAM. (35 fps is the software-enforced limit of the original Doom, and it has been kept in many ports. In the most recent video, the game is running very smoothly at 34-35 fps the majority of time, slowing down below the 30fps mark only occasionally, in complex areas. The article also points to a couple of videos that show the game in action. Previous Doom Port Attempts on the nRF52840īefore starting this project, someone pointed us to this blog post from a Nordic engineer, who ported Doom to the nRF5340, which is a more powerful MCU with respect to nRF52840. We can also implement double buffering, which, together with DMA, will provide a huge performance boost, as we can render a new frame, while the old one is being sent to the display.įinally, we have 1 MB flash: same as we had before. The now available much larger RAM allows us to use a much higher resolution display, without having to worry too much about the frame buffer. In terms of RAM, the nRF52840 has almost 2.5 times the RAM we had in the previous project (a quarter of MB, instead of less than a ninth). Still, as we will see later, to get the maximum from the QSPI peripheral, we rarely access it in memory-mapped mode, especially for random read operations. The maximum QSPI clock speed is 32 MHz, allowing for a peak 16 MB/s transfer rate. the flash memory can be read as if it was part of the microcontroller internal memory: the QSPI module will handle flash read command and address generation. However, unlike the CM33, this CM4 MCU features also a hardware QSPI interface, which also supports memory mapping, i.e. In fact, considering the different DMIPS/MHz (1.25 vs 1.5) and the different clock (64 vs 80 MHz), the CM33 was 1.5 times faster. In terms of computing power, this MCU is much less powerful than the 80-MHz Cortex M33 (CM33 hereafter) we used previously. The nRF52840 features a 64 MHz Cortex M4 (CM4 hereafter), with 256 kB of RAM and 1 MB of flash.
![bluetooth hack app bluetooth hack app](https://cdn.apkmonk.com/images/com.redkitty.phone.hacker.bluetooth.free.png)
Bluetooth hack app Bluetooth#
Now, as the title says, we will be targeting a $13 (excluding shipping) Bluetooth LE USB adapter. Time to add one more device to the list of unusual things that run Doom! “… if it exists, it can run Doom.” It’s again Doom time!