I am trying to program the flash memory using Serial wire Debug in a STM32L152 advanced ARM-based 32-bit MCU.
I will be almost done if this issue gets cleared. I am able to do read and write accesses on each of the DP registers if they actually allow to do so.And when I try to read one of the AP registers, it gives me an 'OK' response. But when I read the value, it gives all zeroes. After that I tried to read the Read Buffer register. Still the same answer. Also when I try to write one of the AP registers, it gives an 'OK' response. Then I sent some 32 bits with a parity bit to be written. But after that the 'STICKYERR' bit got set in the CTRL/STATUS register with the data not being written I hope,which means some bus error has occurred. What may be the problem? At least I should be able to do read and write accesses in the CSW-AP register. Am I right? I thing I may not be aware of some important issue. I would be very much grateful to you if you could spend a little time in clarifying my doubt.
What is the importance of the Clock signal in AP access? Will it be a reason for the above issue?
This post has been edited by Theesan: 16 March 2011 - 11:56 AM