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DFU: fix transitions between runtime and DFU mode

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we now always go through a processor reset to avoid any state that might
be persistent/left-over during the switch.
This commit is contained in:
Harald Welte
2017-03-03 00:34:17 +01:00
parent db17e83960
commit d1e963479e
5 changed files with 27 additions and 13 deletions
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3
firmware/atmel_softpack_libraries/usb/device/dfu/dfu.h
View File

@@ -86,12 +86,11 @@ extern const USBDDriverDescriptors dfu_descriptors;
/* magic value we use during boot to detect if we should start in DFU
* mode or runtime mode */
#define USB_DFU_MAGIC 0xDFDFDFDF
/* RAM address for this magic value above */
#define USB_DFU_MAGIC_ADDR IRAM_ADDR
/* The API between the core DFU handler and the board/soc specific code */
struct dfudata {
uint32_t magic;
uint8_t status;
uint32_t state;
int past_manifest;

3
firmware/atmel_softpack_libraries/usb/device/dfu/dfu_driver.c
View File

@@ -457,7 +457,7 @@ void USBDFU_Initialize(const USBDDriverDescriptors *pDescriptors)
void USBDFU_SwitchToApp(void)
{
/* make sure the MAGIC is not set to enter DFU again */
*(unsigned int *)USB_DFU_MAGIC_ADDR = 0;
g_dfu->magic = 0;
printf("switching to app\r\n");
@@ -468,7 +468,6 @@ void USBDFU_SwitchToApp(void)
__disable_irq();
/* Tell the hybrid to execute FTL JUMP! */
//BootIntoApp();
NVIC_SystemReset();
}

12
firmware/atmel_softpack_libraries/usb/device/dfu/dfu_runtime.c
View File

@@ -178,15 +178,17 @@ out:
void DFURT_SwitchToDFU(void)
{
unsigned int *dfu_except_tbl = (unsigned int *)IFLASH_ADDR;
void (*toDFU)(void) = (void *)dfu_except_tbl[1];
*(unsigned int *)USB_DFU_MAGIC_ADDR = USB_DFU_MAGIC;
/* store the magic value that the DFU loader can detect and
* activate itself, rather than boot into the application */
g_dfu->magic = USB_DFU_MAGIC;
/* Disconnect the USB by remoting the pull-up */
USBD_Disconnect();
__disable_irq();
toDFU();
/* reset the processor, we will start execution with the
* ResetVector of the bootloader */
NVIC_SystemReset();
}
void USBDCallbacks_RequestReceived(const USBGenericRequest *request)