我是一个新programer to "PAN1740A bluetooth module", core of PAN1740A is a DA14585 mcu chip.
On the data sheet, it's said this mcu have 3 mode."normal OTP" mode was very easy to understand, what confuses me was "Development" mode.
Below is qutoe from data sheet: "During development mode phase application code is developed using the ARM Cortex-M0 SW environment. The compiled code is downloaded into the System RAM or any retention RAMs by means of SWD (JTAG) or any serial interface (e.g. UART). Address 0x00 is remapped to the physical memory that contains the code and the CPU is configured to reset and execute code from the remapped device. This mode enables application development, debugging and on-the-fly testing."
Here is my question: when device was under "development mode", because all the app code exist only in RAM, Once I power down the device, alll the code in device will disappear, when I power up the device again, I need to download the code again?
Lack of experienment borad on hand, i just wondering...
Hi jame0769,
Thanks for your question. Please check the BootROM Sequence from the datasheet. When the device boots, the bootrom code reads the application flag from the OTP. If that flags are programmed, then it boot from the OTP. Keep in mind that OTP stands for One Time Programmable, thus you can’t erase and re-write the OTP multiple times, but you can only flip the bits that are still set to 0 and turn them to 1. So, this should be done the product it ready and the OTP should be burnt. This is the normal mode.
In development stage, the application flash should not be programmed. In that stage, the OTP is blank and the chip can boot from different serial interfaces such as UART, SPI Master/Slave and I2C and the application code is downloaded to System-RAM and then the device boots.
Since you are a new programmer, you should use the development mode so that you can debug the code.
If the code is stored into System-RAM, after resetting or power-down the DA14585, then the code is lost, so you should reprogram it. If you would like to retain the code, you should burn the SPI Flash, so when the chips resets or power-up, then it will boot again.
To burn the SPI flash, please use theSmartSnippets Toolbox V5.0.14 for Windows OS.
http://lpccs-docs.dialog-semiconductor.com/UM-B-083/tools/Board_Setup.html
http://lpccs-docs.dialog-semiconductor.com/UM-B-083/tools/SPIFlashProgrammer.html
Thanks, PM_Dialog
Hi PM_Dialog
Thanks for your answers!
Thanks for the information keep sharing such informative post keep suggesting such post.
mymilestonecard.com