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f4discovery: Make DFU work (again?)

This commit is contained in:
Uwe Bonnes 2017-04-15 16:51:58 +02:00
parent f5dd3006fb
commit 814eb0e3a2
1 changed files with 24 additions and 3 deletions
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27
src/platforms/f4discovery/platform.c
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@ -34,6 +34,8 @@
#include <libopencm3/stm32/usart.h>
#include <libopencm3/stm32/syscfg.h>
#include <libopencm3/usb/usbd.h>
#include <libopencm3/cm3/systick.h>
#include <libopencm3/cm3/cortex.h>
jmp_buf fatal_error_jmpbuf;
@ -88,16 +90,35 @@ const char *platform_target_voltage(void)
void platform_request_boot(void)
{
/* Disconnect USB cable */
usbd_disconnect(usbdev, 1);
nvic_disable_irq(USB_IRQ);
if (RCC_AHB2ENR & RCC_AHB2ENR_OTGFSEN) {
usbd_disconnect(usbdev, 1);
nvic_disable_irq(USB_IRQ);
rcc_peripheral_disable_clock(&RCC_AHB2ENR, RCC_AHB2ENR_OTGFSEN);
}
/* Assert blue LED as indicator we are in the bootloader */
rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPDEN);
gpio_mode_setup(LED_PORT, GPIO_MODE_OUTPUT,
GPIO_PUPD_NONE, LED_BOOTLOADER);
gpio_set(LED_PORT, LED_BOOTLOADER);
/* Disable used ports beside PORTD.*/
rcc_peripheral_disable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPAEN);
rcc_peripheral_disable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPCEN);
rcc_periph_clock_disable(USBUSART_CLK);
/* Reset Systick.*/
systick_interrupt_disable();
STK_CSR = 0;
STK_RVR = 0;
STK_CVR = 0;
/*Disable Interrupts.*/
cm_disable_interrupts();
/* Switch back to HSI.*/
while (!(RCC_CR & RCC_CR_HSIRDY))
RCC_CR |= RCC_CR_HSION;
while (RCC_CFGR & (RCC_CFGR_SWS_HSE | RCC_CFGR_SWS_PLL))
RCC_CFGR &= ~(RCC_CFGR_SWS_HSE | RCC_CFGR_SWS_PLL);
/* Jump to the built in bootloader by mapping System flash */
/* Map System flash at 0.*/
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_SYSCFGEN);
SYSCFG_MEMRM &= ~3;
SYSCFG_MEMRM |= 1;