flipperzero-firmware/bootloader/targets/f2/target.c

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C
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#include <target.h>
#include <stm32l4xx.h>
#include <stm32l4xx_ll_system.h>
#include <stm32l4xx_ll_bus.h>
#include <stm32l4xx_ll_utils.h>
#include <stm32l4xx_ll_rcc.h>
#include <stm32l4xx_ll_rtc.h>
#include <stm32l4xx_ll_pwr.h>
#include <stm32l4xx_ll_gpio.h>
// Boot request enum
#define BOOT_REQUEST_NONE 0x00000000
#define BOOT_REQUEST_DFU 0xDF00B000
// Boot to DFU pin
#define BOOT_DFU_PORT GPIOB
#define BOOT_DFU_PIN LL_GPIO_PIN_8
// LCD backlight
#define BOOT_LCD_BL_PORT GPIOB
#define BOOT_LCD_BL_PIN LL_GPIO_PIN_6
// LEDs
#define LED_RED_PORT GPIOA
#define LED_RED_PIN LL_GPIO_PIN_8
#define LED_GREEN_PORT GPIOB
#define LED_GREEN_PIN LL_GPIO_PIN_14
#define LED_BLUE_PORT GPIOB
#define LED_BLUE_PIN LL_GPIO_PIN_1
// USB pins
#define BOOT_USB_PORT GPIOA
#define BOOT_USB_DM_PIN LL_GPIO_PIN_11
#define BOOT_USB_DP_PIN LL_GPIO_PIN_12
#define BOOT_USB_PIN (BOOT_USB_DM_PIN | BOOT_USB_DP_PIN)
void clock_init() {
LL_FLASH_SetLatency(LL_FLASH_LATENCY_4);
LL_RCC_MSI_Enable();
while(LL_RCC_MSI_IsReady() != 1) {
}
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_MSI, LL_RCC_PLLM_DIV_1, 40, LL_RCC_PLLR_DIV_2);
LL_RCC_PLL_Enable();
LL_RCC_PLL_EnableDomain_SYS();
while(LL_RCC_PLL_IsReady() != 1) {
}
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL) {
};
/* Set APB1 & APB2 prescaler*/
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms in using frequency set to 80MHz */
/* This frequency can be calculated through LL RCC macro */
/* ex: __LL_RCC_CALC_PLLCLK_FREQ(__LL_RCC_CALC_MSI_FREQ(LL_RCC_MSIRANGESEL_RUN, LL_RCC_MSIRANGE_6),
LL_RCC_PLLM_DIV_1, 40, LL_RCC_PLLR_DIV_2)*/
LL_Init1msTick(80000000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
LL_SetSystemCoreClock(80000000);
}
void gpio_init() {
LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOA);
LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
// USB D+
LL_GPIO_SetPinMode(BOOT_USB_PORT, BOOT_USB_DP_PIN, LL_GPIO_MODE_OUTPUT);
LL_GPIO_SetPinSpeed(BOOT_USB_PORT, BOOT_USB_DP_PIN, LL_GPIO_SPEED_FREQ_VERY_HIGH);
LL_GPIO_SetPinOutputType(BOOT_USB_PORT, BOOT_USB_DP_PIN, LL_GPIO_OUTPUT_OPENDRAIN);
// USB D-
LL_GPIO_SetPinMode(BOOT_USB_PORT, BOOT_USB_DM_PIN, LL_GPIO_MODE_OUTPUT);
LL_GPIO_SetPinSpeed(BOOT_USB_PORT, BOOT_USB_DM_PIN, LL_GPIO_SPEED_FREQ_VERY_HIGH);
LL_GPIO_SetPinOutputType(BOOT_USB_PORT, BOOT_USB_DM_PIN, LL_GPIO_OUTPUT_OPENDRAIN);
// Button: back
LL_GPIO_SetPinMode(BOOT_DFU_PORT, BOOT_DFU_PIN, LL_GPIO_MODE_INPUT);
LL_GPIO_SetPinPull(BOOT_DFU_PORT, BOOT_DFU_PIN, LL_GPIO_PULL_DOWN);
// Display backlight
LL_GPIO_SetPinMode(BOOT_LCD_BL_PORT, BOOT_LCD_BL_PIN, LL_GPIO_MODE_OUTPUT);
LL_GPIO_SetPinSpeed(BOOT_LCD_BL_PORT, BOOT_LCD_BL_PIN, LL_GPIO_SPEED_FREQ_LOW);
LL_GPIO_SetPinOutputType(BOOT_LCD_BL_PORT, BOOT_LCD_BL_PIN, LL_GPIO_OUTPUT_PUSHPULL);
// LEDs
LL_GPIO_SetPinMode(LED_RED_PORT, LED_RED_PIN, LL_GPIO_MODE_OUTPUT);
LL_GPIO_SetPinOutputType(LED_RED_PORT, LED_RED_PIN, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetOutputPin(LED_RED_PORT, LED_RED_PIN);
LL_GPIO_SetPinMode(LED_GREEN_PORT, LED_GREEN_PIN, LL_GPIO_MODE_OUTPUT);
LL_GPIO_SetPinOutputType(LED_GREEN_PORT, LED_GREEN_PIN, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetOutputPin(LED_GREEN_PORT, LED_GREEN_PIN);
LL_GPIO_SetPinMode(LED_BLUE_PORT, LED_BLUE_PIN, LL_GPIO_MODE_OUTPUT);
LL_GPIO_SetPinOutputType(LED_BLUE_PORT, LED_BLUE_PIN, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetOutputPin(LED_BLUE_PORT, LED_BLUE_PIN);
}
void rtc_init() {
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
LL_PWR_EnableBkUpAccess();
LL_RCC_EnableRTC();
}
void lcd_backlight_on() {
LL_GPIO_SetOutputPin(BOOT_LCD_BL_PORT, BOOT_LCD_BL_PIN);
}
void usb_wire_reset() {
LL_GPIO_ResetOutputPin(BOOT_USB_PORT, BOOT_USB_PIN);
LL_mDelay(10);
LL_GPIO_SetOutputPin(BOOT_USB_PORT, BOOT_USB_PIN);
}
void target_init() {
clock_init();
rtc_init();
gpio_init();
usb_wire_reset();
}
int target_is_dfu_requested() {
if(LL_RTC_BAK_GetRegister(RTC, LL_RTC_BKP_DR0) == BOOT_REQUEST_DFU) {
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_NONE);
return 1;
}
if(LL_GPIO_IsInputPinSet(BOOT_DFU_PORT, BOOT_DFU_PIN)) {
return 1;
}
return 0;
}
void target_switch(void* offset) {
asm volatile("ldr r3, [%0] \n"
"msr msp, r3 \n"
"ldr r3, [%1] \n"
"mov pc, r3 \n"
:
: "r"(offset), "r"(offset + 0x4)
: "r3");
}
void target_switch2dfu() {
LL_GPIO_ResetOutputPin(LED_BLUE_PORT, LED_BLUE_PIN);
// Remap memory to system bootloader
LL_SYSCFG_SetRemapMemory(LL_SYSCFG_REMAP_SYSTEMFLASH);
target_switch(0x0);
}
void target_switch2os() {
LL_GPIO_ResetOutputPin(LED_RED_PORT, LED_RED_PIN);
SCB->VTOR = OS_OFFSET;
target_switch((void*)(BOOT_ADDRESS + OS_OFFSET));
}