Post by thread:[PIC] Microchip AN1003

Just dug this up on the mchip site, thought it might be worth mentioning to the list. http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en024394 Title: USB Mass Storage Device Using a PIC MCU Name: AN1003 Date: 8/30/05 Author: Gurinder Singh Description: This application note describes the design and implementation of a USB Mass Storage Device (MSD) using a Secure Digital card Keywords: Mass Storage, USB, Secure Digital, Flash Media, Multimedia, PIC18F4550 -Denny

Why are they putting out code for even PIC18 devices in "only-C18" form? No love to ASM enthusiasts any more? :( -Ishaan Denny Esterline wrote: {Quote hidden}> Just dug this up on the mchip site, thought it might be worth mentioning to > the list. > www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en024394 > > > Title: USB Mass Storage Device Using a PIC MCU > Name: AN1003 > Date: 8/30/05 > Author: Gurinder Singh > Description: This application note describes the design and implementation > of a USB Mass Storage Device (MSD) using a Secure Digital card > Keywords: Mass Storage, USB, Secure Digital, Flash Media, Multimedia, > PIC18F4550 > > > -Denny >

Having recently studied what it takes to make a USB mass storage device, I certianly wouldn't want to do the entire thing in assembly. Aside from the practical side of the decision, one may also want to point out that C18 is a product which, I assume, they profit from. It would make sense to promote that product in any way possible. -Adam On 9/11/05, Ishaan Dalal <spam_OUTizxTakeThisOuTxizx.net> wrote: {Quote hidden}> Why are they putting out code for even PIC18 devices in "only-C18" form? > No love to ASM enthusiasts any more? :( > > -Ishaan > > > > Denny Esterline wrote: > > Just dug this up on the mchip site, thought it might be worth mentioning to > > the list. > > www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en024394 > > > > > > Title: USB Mass Storage Device Using a PIC MCU > > Name: AN1003 > > Date: 8/30/05 > > Author: Gurinder Singh > > Description: This application note describes the design and implementation > > of a USB Mass Storage Device (MSD) using a Secure Digital card > > Keywords: Mass Storage, USB, Secure Digital, Flash Media, Multimedia, > > PIC18F4550 > > > > > > -Denny > > > > -

This is not because of the reason that C18 is a commercial product. I guess Microchip will be more than happy to give it for free if one will buy a lot of PIC chips. Another reason is because of the third party ISVs like Hi-Tech and IAR and Microchip can not simply gives C18/C30 for free. More choices is generally better than only one choice (even a free one). As for the practical side, C18/C30 are good choice for high-end PIC18 and dsPICs and they are more C-friendly. Assembly is always necessary but may take longer time to develop something like USB framework or similar. The maintenance will also be a problem. Of course, one could always do it since MPASM and MPASM30 are both free. I know from Microchip Forum USB section that people (pacer?) have created assembly based USB framework based on the old 16C745/765 code base. But it can not be released to the public. Olin College (bminch) has assembly based USB firmwares for 16C/18F USB parts as well. There is another attempt to create an equivalent of Microchip USB firmware based on disassembly of the hex file and the C18 source code. It is not fully working yet though. For more information, please go to Microchip Forum USB section. Regards, Xiaofan {Original Message removed}