Erik -
IAP code for Freescale platforms
Dependents: 18_PT1000 RDA5807M-FM-Radio flashaccess TF_conops_BAEFLAGIMAN ... more
K22F
Due to the default clock setup of the K22F, flash write access is there disabled. In the future I might add a workaround, but for now see: https://developer.mbed.org/questions/52738/Error-with-FreescaleIAP-code-with-K22F/
Be careful with which flash you are erasing/overwriting!
Example code:
#include "mbed.h"
#include "FreescaleIAP.h"
int main() {
int address = flash_size() - SECTOR_SIZE; //Write in last sector
int *data = (int*)address;
printf("Starting\r\n");
erase_sector(address);
int numbers[10] = {0, 1, 10, 100, 1000, 10000, 1000000, 10000000, 100000000, 1000000000};
program_flash(address, (char*)&numbers, 40); //10 integers of 4 bytes each: 40 bytes length
printf("Resulting flash: \r\n");
for (int i = 0; i<10; i++)
printf("%d\r\n", data[i]);
printf("Done\r\n\n");
while (true) {
}
}
For an example on using this for a bootloader, check out: http://developer.mbed.org/users/Sissors/code/Bootloader_K64F/
If you want to permanently store a variable between resets, you can run into the problem of how to define the value the first time. Since the mbed drag-and-drop loader seems to issue a full-chip erase, you cannot first upload a program to set the initial value, and then switch to the regular program: The full-chip erase will also erase your initial value. One option is to use the same statements as used in the bootloader example to force it to program initial values for your variables on your memory address. This should work fine, however it is target dependent where you want to program it (generally your last sector), so it makes for a less nice example program. You can also try to detect if it is the initial run by looking at the state of the flash, by default this is all '1's. The following example does this:
#include "mbed.h"
#include "FreescaleIAP.h"
int main() {
int address = flash_size() - SECTOR_SIZE; //Write in last sector
int *data = (int*)address;
//By default flash is initialized at 0xFF, this is signed -1, so now we know
//the program runs for the first time. You of course need to make sure your program
//never writes -1 to this variable if you use this method
//Alternatively you could also do the same, but with a seperate "initial run" variable added,
//so your other variables can take any value
if (data[0] == -1) {
printf("Initial run\r\n");
printf("Writing 42 and 42\r\n");
erase_sector(address);
int newvalues[2] = {42, 42};
program_flash(address,(char*) newvalues, 8); //Two integers of 4 bytes = 8 bytes
while(1);
}
printf("Current = %d and %d, new is %d and %d\r\n", data[0], data[1], data[0]+1, data[1]-1);
int newvalues[2] = {data[0]+1, data[1]-1};
erase_sector(address);
program_flash(address, (char*) newvalues, 8);
while(1);
}
Diff: FreescaleIAP.cpp
- Revision:
- 0:8eef5a3e83ca
- Child:
- 1:702fd2d53c17
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/FreescaleIAP.cpp Sat May 10 20:12:57 2014 +0000
@@ -0,0 +1,120 @@
+#include "FreescaleIAP.h"
+
+#define IAPDEBUG
+
+enum FCMD {
+ Read1s = 0x01,
+ ProgramCheck = 0x02,
+ ReadResource = 0x03,
+ ProgramLongword = 0x06,
+ EraseSector = 0x09,
+ Read1sBlock = 0x40,
+ ReadOnce = 0x41,
+ ProgramOnce = 0x43,
+ EraseAll = 0x44,
+ VerifyBackdoor = 0x45
+ };
+
+inline void run_command(void);
+bool check_boundary(int address, unsigned int length);
+bool check_align(int address);
+IAPCode check_error(void);
+
+IAPCode erase_sector(int address) {
+ #ifdef IAPDEBUG
+ printf("IAP: Erasing at %x\r\n", address);
+ #endif
+ if (check_align(address))
+ return AlignError;
+
+ //Setup command
+ FTFA->FCCOB0 = EraseSector;
+ FTFA->FCCOB1 = (address >> 16) & 0xFF;
+ FTFA->FCCOB2 = (address >> 8) & 0xFF;
+ FTFA->FCCOB3 = address & 0xFF;
+
+ run_command();
+
+ return check_error();
+}
+
+IAPCode program_word(int address, char *data) {
+ #ifdef IAPDEBUG
+ printf("IAP: Programming word at %x, %d - %d - %d - %d\r\n", address, data[0], data[1], data[2], data[3]);
+ #endif
+ if (check_align(address))
+ return AlignError;
+
+ //Setup command
+ FTFA->FCCOB0 = ProgramLongword;
+ FTFA->FCCOB1 = (address >> 16) & 0xFF;
+ FTFA->FCCOB2 = (address >> 8) & 0xFF;
+ FTFA->FCCOB3 = address & 0xFF;
+ FTFA->FCCOB4 = data[3];
+ FTFA->FCCOB5 = data[2];
+ FTFA->FCCOB6 = data[1];
+ FTFA->FCCOB7 = data[0];
+
+ run_command();
+
+ return check_error();
+}
+
+/* Clear possible flags which are set, run command, wait until done */
+inline void run_command(void) {
+ //Clear possible old errors, start command, wait until done
+ FTFA->FSTAT = FTFA_FSTAT_FPVIOL_MASK | FTFA_FSTAT_ACCERR_MASK | FTFA_FSTAT_RDCOLERR_MASK;
+ FTFA->FSTAT = FTFA_FSTAT_CCIF_MASK;
+ while (!(FTFA->FSTAT & FTFA_FSTAT_CCIF_MASK));
+}
+
+
+
+/* Check if no flash boundary is violated
+ Returns true on violation */
+bool check_boundary(int address, unsigned int length) {
+ address &= ~1023;
+ int temp = (address+length - 1) & (~1023);
+ bool retval = (address != temp);
+ #ifdef IAPDEBUG
+ if (retval)
+ printf("IAP: Boundary violation\r\n");
+ #endif
+ return retval;
+}
+
+/* Check if address is correctly aligned
+ Returns true on violation */
+bool check_align(int address) {
+ bool retval = address & 0x03;
+ #ifdef IAPDEBUG
+ if (retval)
+ printf("IAP: Alignment violation\r\n");
+ #endif
+ return retval;
+}
+
+IAPCode check_error(void) {
+ if (FTFA->FSTAT & FTFA_FSTAT_FPVIOL_MASK) {
+ #ifdef IAPDEBUG
+ printf("IAP: Protection violation\r\n");
+ #endif
+ return ProtectionError;
+ }
+ if (FTFA->FSTAT & FTFA_FSTAT_ACCERR_MASK) {
+ #ifdef IAPDEBUG
+ printf("IAP: Flash access error\r\n");
+ #endif
+ return AccessError;
+ }
+ if (FTFA->FSTAT & FTFA_FSTAT_RDCOLERR_MASK) {
+ #ifdef IAPDEBUG
+ printf("IAP: Collision error\r\n");
+ #endif
+ return CollisionError;
+ }
+ #ifdef IAPDEBUG
+ printf("IAP: No error reported\r\n");
+ #endif
+ return Success;
+}
\ No newline at end of file
