关于修改STM8S的FLASH的问题

moqiqi

我想在MCU初始化的时候修改FLASH的Option bytes字节，改变它的映射地址，看了下资料，没有弄明白，选用ICP的两种方式好像都需要连接SWIM编程器，通过SWIM编程器控制复位，但是我想把程序烧写进去，让软件自己修改FLASH，不知道该怎么弄，求高手解答。
methods
The in-circuit programming (ICP) method is used to update the content of Flash program
memory and data EEPROM.
The programming interface for STM8 devices is the SWIM (Single Wire Interface Module). It
is used to communicate with an external programming device connected via a cable.
See STM8 SWIM communication protocol and debug module user manual (UM0470) for
more details on the SWIM mode entry and SWIM protocol.
When using the SWIM protocol, two methods can be used:
First method
The first method consists of writing directly into the Flash registers and memory locations
through the write memory command of the SWIM protocol. To make sure that the CPU is
not accessing the memory during block Flash programming, the core must be stalled by
setting the STALL bit in the DM_CSR2 debug module register.
The following sequence is required:
1. Apply a RESET
2. Activate the SWIM by sending the entry sequence on the SWIM pin
3. Activate the SWIM_CSR register by writing 1 to the DM bit in SWIM_CSR
4. Disable interrupts by setting the SAFE_MASK bit in SWIM_CSR
5. Release RESET
6. Verify the DeviceID by reading it using ROTF command
7. Send the SWIM SRST command
8. Unlock the memory by writing the MASS keys
9. Program the Flash program memory using the SWIM WOTF command
Second method
The second method uses the same sequence of operations as the first method except that
the ICP driver firmware must be downloaded in RAM before being launched:
1. Apply a RESET
2. Activate the SWIM by sending the entry sequence on the SWIM pin
3. Activate the SWIM_CSR register by writing 1 to the DM bit in SWIM_CSR
4. Disable interrupts by setting the SAFE_MASK bit in SWIM_CSR
5. Release RESET
6. Verify the DeviceID by reading it using ROTF command
7. Send the SWIM SRST command
8. Unlock the memory by writing the MASS keys
9. Download the ICP driver firmware into the device RAM using the SWIM WOTF
command
10. Execute the ICP driver:
a) Modify the CPU registers (new PC, X, Y, CC...) using the WOTF commands
b) Set the FLASH bit in the DM_CSR2 register
c) Clear the STALL bit in the DM_CSR2 register

安

你是说对FLASH进行擦写吗？
FLASH在使用的时候要注意：
1、擦除是针对整区FLASH，而不能进行莫个地址的擦除
2、写入的时候，地址必须是偶地址，否则会出现错误
3、同一个地址只能写入1次，如果再想写入，就需要擦除以后再写入了

moqiqi

我想修改EEPROM中的Option bytes字节，Option bytes用于配置硬件特性和存储器保护状态。我想修改MCU的硬件特性，默认的AFR0不是定时器2的输出通道1，我要把该通道配置为定时器2的通道1，但我不知道该怎样在软件中修改。文档上面说“选项字节可以在ICP/SWIM模式中或IAP模式中修改。”从上面的英文字面看修改时好像都需要连接SWIM,不知道改怎么弄不需要SWIM连接，直接一次烧写完运行软件就修改选项字节，这样有利于生产。