Content originally posted in LPCWare by tarmo on Fri May 18 04:05:55 MST 2012
Hi
How do i start ISP as MSC USB device on LPC11U24 using IAP Reinvoke ISP command (57). The following code works well on LPC1343 but not on LPC11U24.
I can execute ISP as USB MSC device during reset or power on (PIO0_1 low & PIO0_3 high).
All other IAP commands are working well. So i think the problem is with init_msdstate() function.
#define IAP_LOCATION 0x1fff1ff1
typedef void (*IAP)(unsigned int[], unsigned int[]);
IAP iap_entry = (IAP) IAP_LOCATION;
#define CMD_SUCCESS 0
unsigned int Command[5];
unsigned int Result[4];
#define init_msdstate() *((uint32_t *)(0x10000054)) = 0x0
void EnterISP(void) {
/* make sure USB clock is turned on before calling ISP */
LPC_SYSCON->SYSAHBCLKCTRL |= 0x04000;
/* make sure 32-bit Timer 1 is turned on before calling ISP */
LPC_SYSCON->SYSAHBCLKCTRL |= 0x00400;
/* make sure GPIO clock is turned on before calling ISP */
LPC_SYSCON->SYSAHBCLKCTRL |= 0x00040;
/* make sure IO configuration clock is turned on before calling ISP */
LPC_SYSCON->SYSAHBCLKCTRL |= 0x10000;
/* make sure AHB clock divider is 1:1 */
LPC_SYSCON->SYSAHBCLKDIV = 1;
/* Send Reinvoke ISP command to ISP entry point*/
Command[0] = 57;
init_msdstate(); /* Initialize Storage state machine */
/* Set stack pointer to ROM value (reset default) This must be the last
piece of code executed before calling ISP, because most C expressions
and function returns will fail after the stack pointer is changed. */
__set_MSP(*((uint32_t *) 0x1FFF0000)); /* inline asm function */
/* Enter ISP. We call "iap_entry" to enter ISP because the ISP entry is done
through the same command interface as IAP. */
iap_entry(Command, Result);
// Not supposed to come back!
}
