/* Write flash memory. */

To write data to flash memory, you need to follow these steps:

1. Unlock the flash memory: Before you can write to the flash memory, you need to unlock it. This is done by setting the correct values in the Flash Control Register (FCR). You can refer to your microcontroller's datasheet for the specific register values.

2. Erase the flash memory: Flash memory needs to be erased before it can be written to. This is because flash memory is organized into sectors, and each sector needs to be erased before new data can be written to it. Again, you can refer to your microcontroller's datasheet for the specific erase procedure.

3. Write the data: Once the flash memory has been unlocked and erased, you can write your data to it. This is done by setting the correct values in the Flash Data Register (FDR). You will need to write the data one byte at a time, and make sure to increment the memory address after each write.

4. Lock the flash memory: After you have finished writing your data, you need to lock the flash memory again. This is done by setting the correct values in the FCR.

It's important to note that writing to flash memory is a delicate process, and any errors can result in permanent damage to the memory. Therefore, it's important to follow the correct procedures and to thoroughly test your code before deploying it in a production environment.