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stm32f4: Add support for flashing over USB

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-10-26 13:24:59 -04:00
parent 0ba5819370
commit 5da6a62759
3 changed files with 29 additions and 4 deletions
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14
src/stm32/stm32f4.c
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@@ -6,6 +6,7 @@
#include "autoconf.h" // CONFIG_CLOCK_REF_8M
#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
@@ -88,10 +89,16 @@ gpio_peripheral(uint32_t gpio, uint32_t mode, int pullup)
regs->OSPEEDR = (regs->OSPEEDR & ~m_msk) | (0x02 << m_shift);
}
#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();
*(uint64_t*)USB_BOOT_FLAG_ADDR = USB_BOOT_FLAG;
NVIC_SystemReset();
}
#if CONFIG_CLOCK_REF_8M
@@ -202,6 +209,13 @@ clock_setup(void)
void
armcm_main(void)
{
if (*(uint64_t*)USB_BOOT_FLAG_ADDR == USB_BOOT_FLAG) {
*(uint64_t*)USB_BOOT_FLAG_ADDR = 0;
uint32_t *sysbase = (uint32_t*)0x1fff0000;
asm volatile("mov sp, %r0\n bx %r1"
: : "r"(sysbase[0]), "r"(sysbase[1]));
}
// Run SystemInit() and then restore VTOR
SystemInit();
SCB->VTOR = (uint32_t)VectorTable;