如題，從官網(wǎng)EVT壓縮包中的IAP例程只有跳轉(zhuǎn)到boot的isp下載，不是IAP區(qū)的自定義燒錄，另外也有看過ch559的IAP例程，是通過跳轉(zhuǎn)至IAP區(qū)然后上位機燒錄，但個人能力有限，移植至554上使用難度不小，希望大大可以給一份可以在554上用的IAP例程以及上位機例程。

論壇搜了一圈發(fā)現(xiàn)有CH552的IAP例程，我去試試移植，有問題再求助大大們！

The problem is the bootloader in the CH554 devices. For loader version >= 2.31 the IAP call does not exist anymore. I just found that call in V1.1.?

Actuall devices of CH554 (CH552) are delivered with V2.5.

For CH559 its a bit different: In V2.31 there is still the IAP call suported. I dont know if there are newer versions of the bootloader for CH559 exit. I know of V2.0 and V2.31.

I guess IAP will not work with new versions of the bootloader because of security reasons. Bootloaders with IAP support all have included the keil libfunction _ICALL. More infos on my Gid pages or (in German) here?

https://www.mikrocontroller.net/topic/462538?goto=new#6820478

@OJZ?可以參考下CH549的IAP例程設(shè)計，更接近CH554的代碼風(fēng)格，移植相對簡單點

CH546iap20230627代碼邏輯保護.zip

@usbman?Chips are updated to the latest BOOT version before leaving the factory。

@TECH29?大大，這個例程我這邊有一些不太明白的地方：

1、codeflash地址預(yù)留0x0000~0x0078是有什么具體作用，我看沒有程序燒錄到這個地址，ch554這部分是否也有作用?

2、IAP工程地址起始從0x6000開始，APP地址從0x104開始，那么燒錄后上電是如何進入APP或者IAP區(qū)？我理解上電后復(fù)位后boot從0x0000開始執(zhí)行。

3、IAP工程中，USB初始化中開啟了中斷，然后主函數(shù)中又通過while判斷標(biāo)志輪詢中斷函數(shù)，這是否有必要？

4、IAP工程中的flash擦除流程，從554頭文件看沒有擦除命令定義，這部分是否就不適用ch554了？

I describe what I have done in the past:

I created a simple USB device just with control EP no other EPs. for flashing I used a vendor request

wIndex= adrress wValue=16 bit flashcontend no datastage. I linked that code to 0x3000 with modified startup.a51 (keil). For crccheck i used a second request wIndex = usr code size wValue = expected CRC.?

If for any reason the crc fails I flash LMP 0x3000 + NOP at address 0x0000 so the IAP is reactivated again.

The same LMP 0x3000 + NOP is additionally linked a small asm module to the IAP code

? ? ?CSEG at 0

? ? ?LJMP 0x3000

? ? NOP

? ? end

This ensures that after Flashing the IAP code with WCHIspTool IAP starts automatically.

- CH552/554 dont need a erase.?

- IAP code can not use any interrupt?

- usercode can be at max from 0x0000 to 0x2FFF

@OJZ?
1，因為前面有四個字節(jié)的跳轉(zhuǎn)信息是一定不能被擦除修改的，而flash是頁編程，因此直接跳過前面一頁

2,? 0地址的跳轉(zhuǎn)信息做到

3，因為IAP中不能出現(xiàn)中斷，中斷向量表留給APP用

4，554可以直接編程不需要擦