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| 01:55.50 | gkwhc | Hey guys, is there some sort of hardware configuration/MCU/MPU that embedded linux can run on that costs <<$15 USD? ive been googling around but it seems like all the processors are >$15 in single quantities... |
| 02:03.21 | prpplague | gkwhc: there are literally hundreds |
| 02:03.43 | prpplague | gkwhc: it all depends on how much horse power you need and what additional components they require |
| 02:42.22 | gkwhc | prpplague: really? i dont need much horse power, enough to build a guitar effects device |
| 02:43.01 | prpplague | gkwhc: any arm9 series would do, but these days you can get an arm11 or cortex-a8 for that price |
| 02:43.33 | prpplague | gkwhc: the sitara line from TI is extremely affordable, and you can prototype what you want with a beaglebone black board |
| 02:45.46 | gkwhc | prpplague: i see. what distributor do you get stuff from? it seems like these systems would require quite a bit of external components, such as boot flash, external ram, as well as a 4-6 layer PCB |
| 02:46.11 | prpplague | gkwhc: modern CPU/SoC's are going to be that way |
| 02:46.26 | prpplague | gkwhc: you can get many of them as System-on-Modules |
| 02:46.41 | prpplague | gkwhc: the ebaglebone black is easy to prototype with |
| 02:49.06 | MonMotha | gkwhc: do you really need to run Linux on it? If you just want to do some DSP, ARM Cortex-M4 devices are plentiful and very cheap |
| 02:49.34 | MonMotha | and usually a "1-chip solution" aside from any mixed-signal (i.e. you need a CODEC and some sort of AFE) |
| 02:50.05 | MonMotha | I've slapped them down on cheap 2-layer PCBs with quite a bit of success. You just have to be careful with the power bypassing if you're doing that. |
| 02:50.13 | MonMotha | 4-layer PCB and it's almost impossible to screw up |
| 02:50.52 | MonMotha | but you could also look at a RasPi, of all things. Apparently there's an I2S bus exposed on the GPIO header that you can hook a CODEC up to. |
| 02:51.00 | MonMotha | they're definitely cheap! |
| 02:51.10 | gkwhc | MonMotha: i see. i'd like to have linux since its scalable and I could add new features/more effects without redesigning the hardware. |
| 02:51.43 | MonMotha | you could do that on a CM4 unless you need a ton of RAM or CPU time |
| 02:51.57 | prpplague | gkwhc: recommendation - try something pre-made ready to go like the black first, it's only $45 |
| 02:52.02 | MonMotha | most basic guitar effects will readily fit on a baseline ARM CM4 |
| 02:52.03 | gkwhc | but what im curious about as well, is that how a DSP compares to arm9 in this sort of application |
| 02:52.24 | MonMotha | well, most "modern" ARM9s are ARM926EJ-S based, and those have the DSP extensions |
| 02:52.36 | MonMotha | the Cortex-A series stuff will have NEON, which is even better |
| 02:52.50 | gkwhc | hrm |
| 02:52.53 | MonMotha | ARM CM-4 has some basic SIMD and multiply-accumulate |
| 02:53.06 | MonMotha | they won't be as fast as a dedicated DSP at a comparable clock rate, but they're a heckuvalot easier to program |
| 02:53.29 | gkwhc | makes sense |
| 02:54.09 | gkwhc | ive been looking into TI's C55xx series, and they look pretty powerful. however TI support/resources arent that wonderful |
| 02:57.44 | MonMotha | they are pretty powerful, yes |
| 02:57.55 | MonMotha | but they're not particularly easy to program and definitely not F/OSS friendly |
| 02:58.42 | gkwhc | by the way, is it hard to get boot time on embedded linux to be <1sec? seems like generally it takes about 5-10sec |
| 02:58.47 | MonMotha | I know the C6xxx series can hit 2 MAC/Hz |
| 02:59.06 | MonMotha | less than 1sec is tough, but you can definitely get it below 5-10 with a little effort |
| 02:59.24 | MonMotha | of course, I can have a CM4 up and doing DSP in a few dozen ms :) |
| 02:59.34 | MonMotha | (you could do that on an ARM9 or whatever, too, but not with Linux) |
| 03:02.25 | gkwhc | MonMotha: what do you mean not with linux? the boot time? |
| 03:17.45 | MonMotha | yeah, just boot time |
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| 03:51.51 | gkwhc | alright, thanks for all the tips! i better get on mouser and start searching |
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| 07:38.47 | keesj | I think linux won't be a great match for something as "simple" . perhaps looks at http://www.freertos.org/ or similar and look at the hardware they need. It will remove the need for external memory and other stuff |
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