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stm32: Separate out USB DFU reboot logic in stm32l4.c 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2022-12-15 11:20:37 -05:00
parent be74c72555
commit b6cd77f6e3
1 changed files with 43 additions and 26 deletions
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67
src/stm32/stm32l4.c
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@ -7,7 +7,6 @@
#include "autoconf.h" // CONFIG_CLOCK_REF_FREQ
#include "board/armcm_boot.h" // VectorTable
#include "board/irq.h" // irq_disable
#include "board/usb_cdc.h" // usb_request_bootloader
#include "command.h" // DECL_CONSTANT_STR
#include "internal.h" // enable_pclock
#include "sched.h" // sched_main
@ -68,25 +67,6 @@ gpio_clock_enable(GPIO_TypeDef *regs)
RCC->AHB2ENR;
}
#define USB_BOOT_FLAG_ADDR (CONFIG_RAM_START + CONFIG_RAM_SIZE - 4096)
#define USB_BOOT_FLAG 0x55534220424f4f54 // "USB BOOT"
// Handle USB reboot requests
void
usb_request_bootloader(void)
{
irq_disable();
// System DFU Bootloader
*(uint64_t*)USB_BOOT_FLAG_ADDR = USB_BOOT_FLAG;
NVIC_SystemReset();
}
void
bootloader_request(void)
{
usb_request_bootloader();
}
#if !CONFIG_STM32_CLOCK_REF_INTERNAL
DECL_CONSTANT_STR("RESERVE_PINS_crystal", "PC14,PC15");
#endif
@ -154,16 +134,53 @@ clock_setup(void)
;
}
// Main entry point - called from armcm_boot.c:ResetHandler()
void
armcm_main(void)
/****************************************************************
* Bootloader
****************************************************************/
#define USB_BOOT_FLAG_ADDR (CONFIG_RAM_START + CONFIG_RAM_SIZE - 4096)
#define USB_BOOT_FLAG 0x55534220424f4f54 // "USB BOOT"
// Flag that bootloader is desired and reboot
static void
usb_reboot_for_dfu_bootloader(void)
{
if (CONFIG_USBSERIAL && *(uint64_t*)USB_BOOT_FLAG_ADDR == USB_BOOT_FLAG) {
irq_disable();
// System DFU Bootloader
*(uint64_t*)USB_BOOT_FLAG_ADDR = USB_BOOT_FLAG;
NVIC_SystemReset();
}
// Check if rebooting into system DFU Bootloader
static void
check_usb_dfu_bootloader(void)
{
if (!CONFIG_USB || *(uint64_t*)USB_BOOT_FLAG_ADDR != USB_BOOT_FLAG)
return;
*(uint64_t*)USB_BOOT_FLAG_ADDR = 0;
uint32_t *sysbase = (uint32_t*)0x1fff0000;
asm volatile("mov sp, %0\n bx %1"
: : "r"(sysbase[0]), "r"(sysbase[1]));
}
}
// Handle USB reboot requests
void
bootloader_request(void)
{
usb_reboot_for_dfu_bootloader();
}
/****************************************************************
* Startup
****************************************************************/
// Main entry point - called from armcm_boot.c:ResetHandler()
void
armcm_main(void)
{
check_usb_dfu_bootloader();
// Run SystemInit() and then restore VTOR
SystemInit();