static void clock_setup(void)
{
	/* Enable GPIOG clock for LED & USARTs. */
	rcc_periph_clock_enable(RCC_GPIOG);
	rcc_periph_clock_enable(RCC_GPIOB);

	/* Enable clocks for USART1. */
	rcc_periph_clock_enable(RCC_USART3);
}

void i2c_led_platform_init(void)
{
	// Enable I2C2
	rcc_periph_clock_enable(RCC_I2C2);
	rcc_periph_clock_enable(RCC_DMA1);

	// Setup I2C port
	setup_i2c_port(I2C_400KHz);
}

static void clock_setup(void)
{
	/* Enable GPIOD clock for LED & USARTs. */
	rcc_periph_clock_enable(RCC_GPIOD);
	rcc_periph_clock_enable(RCC_GPIOA);

	/* Enable clocks for USART2. */
	rcc_periph_clock_enable(RCC_USART2);
}

/* Set STM32 to 168 MHz. */
static void clock_setup(void)
{
	rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);

	/* Enable GPIOD, GPIOG, and GPIOK clock. */
	rcc_periph_clock_enable(RCC_GPIOD);
	rcc_periph_clock_enable(RCC_GPIOG);
	rcc_periph_clock_enable(RCC_GPIOK);
}

/*--------------------------------------------------------------------------*/
static void clock_setup(void)
{
	rcc_clock_setup_in_hse_8mhz_out_72mhz();

/* Enable GPIOA, GPIOB, GPIOC clock. */
    rcc_periph_clock_enable(RCC_GPIOA);
	rcc_periph_clock_enable(RCC_GPIOB);
	rcc_periph_clock_enable(RCC_GPIOC);
}

/*--------------------------------------------------------------------*/
void gpio_setup(void)
{
    rcc_periph_clock_enable(RCC_GPIOA);
    rcc_periph_clock_enable(RCC_GPIOC);
    rcc_periph_clock_enable(RCC_AFIO);
/* Digital Test outputs PC0 and PC1 */
	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
		      GPIO_CNF_OUTPUT_PUSHPULL, GPIO0 | GPIO1);
}

static void rcc_setup(void)
{
	rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_120MHZ]);

	/* Enable GPIOD clock for onboard leds. */
	rcc_periph_clock_enable(RCC_GPIOD);

	/* Enable rng clock */
	rcc_periph_clock_enable(RCC_RNG);
}

void disconnect_usb(void)
{
	/* Disconnect USB cable by resetting USB Device and pulling USB_DP low*/
	rcc_periph_reset_pulse(RST_USB);
	rcc_periph_clock_enable(RCC_USB);
	rcc_periph_clock_enable(RCC_GPIOA);
	gpio_clear(GPIOA, GPIO12);
	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
		GPIO_CNF_OUTPUT_OPENDRAIN, GPIO12);
}

static void gpio_setup(void)
{
	/* Enable GPIOB clock. */
	rcc_periph_clock_enable(RCC_GPIOA);
	rcc_periph_clock_enable(RCC_GPIOB);

	/* set pins to output mode, push pull */
	gpio_mode_setup(LED_RED_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_RED_PIN);
	gpio_mode_setup(LED_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_GREEN_PIN);
}

/* Set STM32 to 72 MHz. */
static void clock_setup(void)
{
	rcc_clock_setup_in_hse_12mhz_out_72mhz();

	/* Enable GPIOA, GPIOB, GPIOC, and AFIO clocks. */
	rcc_periph_clock_enable(RCC_GPIOA);
	rcc_periph_clock_enable(RCC_GPIOB);
	rcc_periph_clock_enable(RCC_GPIOC);
	rcc_periph_clock_enable(RCC_AFIO);
}

void usb_tmc_setup_pre_arch(void)
{
	rcc_periph_clock_enable(RCC_GPIOA);
	rcc_periph_clock_enable(USB_RCC);

	/* Not sure if we need 9 for ID or even if we need this at all */
	gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE,
		GPIO9 | GPIO11 | GPIO12);
	gpio_set_af(GPIOA, GPIO_AF10, GPIO9 | GPIO11 | GPIO12);
}

static void gpio_setup(void)
{
	rcc_periph_clock_enable(RCC_GPIOE);
    rcc_periph_clock_enable(RCC_GPIOA);
	gpio_mode_setup(GPIOE, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
                    GPIO8 | GPIO9 | GPIO10 | GPIO11 | GPIO12 | GPIO13 |
                    GPIO14 | GPIO15);
    
    gpio_mode_setup(GPIOE, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, GPIO0); //ADC_EOC
}

static void gpio_setup(void)
{
	rcc_periph_clock_enable(RCC_GPIOE);
    rcc_periph_clock_enable(RCC_GPIOD); //timer
    gpio_set_af(GPIOD, GPIO_AF2, GPIO2); //timer
	gpio_mode_setup(GPIOE, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
                    GPIO8 | GPIO9 | GPIO10 | GPIO11 | GPIO12 | GPIO13 |
                    GPIO14 | GPIO15);
    gpio_mode_setup(GPIOD, GPIO_MODE_AF, GPIO_PUPD_PULLUP,
                    GPIO2); //timer
}

/*--------------------------------------------------------------------*/
static void gpio_setup(void)
{
	/* Port A and C are on AHB1 */
	rcc_periph_clock_enable(RCC_GPIOA);
	rcc_periph_clock_enable(RCC_GPIOC);
	/* Set the digital test output on PC1 */
	gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO1);
	gpio_set_output_options(GPIOC, GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, GPIO1);
	/* Set PA4 for DAC channel 1 to analogue, ignoring drive mode. */
	gpio_mode_setup(GPIOA, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, GPIO4);
}

static void clock_setup(void) {
    rcc_clock_setup_in_hse_8mhz_out_72mhz();

    /* Enable GPIOC clock (for LED GPIOs). */
    rcc_periph_clock_enable(RCC_GPIOC);

    /* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
    rcc_periph_clock_enable(RCC_GPIOA);
    rcc_periph_clock_enable(RCC_AFIO);
    rcc_periph_clock_enable(RCC_USART1);
}

int main(void)
{
	double flash_rate = 3.14159;
	char buf[128];
	uint32_t done_time;

	/* ../util/retarget.c has automatically set up the clock rate, systick
	 * and made the virtual COM port on the board into the "console" or
	 * standard output and input.
	 *
	 * When the output is sent to standard error, it is highlighted in a
	 * different color (if you have a color xterm)
	 */
	fprintf(stderr, "\nSTM32F469-Discovery : ");
	printf("Retargeting LIBC example.\n");

	/* This is the LED on the board */
	rcc_periph_clock_enable(RCC_GPIOD);
	rcc_periph_clock_enable(RCC_GPIOG);
	rcc_periph_clock_enable(RCC_GPIOK);
	gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO5 | GPIO4);
	gpio_mode_setup(GPIOG, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO6);
	gpio_mode_setup(GPIOK, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO3);

	led_state = 0; /* useful when restarting in gdb */

	/* You can create a running dialog with the console */
	printf("We're going to start blinking the LED, between 0 and 300 times per\n");
	printf("second.\n");
	while (1) {
		printf("Please enter a flash rate: ");
		fflush(stdout);
		fgets(buf, 128, stdin);
		buf[strlen(buf) - 1] = '\0';
		flash_rate = atof(buf);
		if (flash_rate == 0) {
			printf("Was expecting a number greater than 0 and less than 300.\n");
			printf("but got '%s' instead\n", buf);
		} else if (flash_rate > 300.0) {
			printf("The number should be less than 300.\n");
		} else {
			break;
		}
	}
	/* MS per flash */
	done_time = (int) (500 / flash_rate);
	printf("\nThe closest we can come will be %f flashes per second\n", 500.0 / done_time);
	printf("With %d MS between states\n", (int) done_time);
	printf("Press ^C to restart this demo.\n");
	while (1) {
		msleep(done_time);
		rotate_leds();
	}
}

void msc_target_init(void)
{
	rcc_clock_setup_hse_3v3(&rcc_hse_25mhz_3v3);

	rcc_periph_clock_enable(RCC_GPIOA);
	rcc_periph_clock_enable(RCC_OTGFS);

	gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE,
			GPIO9 | GPIO11 | GPIO12);
	gpio_set_af(GPIOA, GPIO_AF10, GPIO9 | GPIO11 | GPIO12);
}

static void clock_setup(void)
{
	rcc_clock_setup_in_hse_8mhz_out_72mhz();

	/* Enable TIM1 clock. */
	rcc_periph_clock_enable(RCC_TIM1);

	/* Enable GPIOC, Alternate Function clocks. */
	rcc_periph_clock_enable(RCC_GPIOA);
	rcc_periph_clock_enable(RCC_AFIO);
}

static void usb_setup(void)
{
	/* Enable clocks for GPIO port A (for GPIO_USART2_TX) and USART2. */
	rcc_usb_prescale_1();
	rcc_periph_clock_enable(RCC_USB);
	rcc_periph_clock_enable(RCC_GPIOA);

	/* Setup GPIO pin GPIO_USART2_TX/GPIO9 on GPIO port A for transmit. */
	gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO11 | GPIO12);
	gpio_set_af(GPIOA, GPIO_AF14, GPIO11| GPIO12);
}

static void clock_setup(void)
{
    // Set STM32 to 168 MHz
    rcc_clock_setup_hse_3v3(&hse_25mhz_3v3[CLOCK_3V3_168MHZ]);

    // Enable GPIO clock
    rcc_periph_clock_enable(RCC_GPIOA);
    rcc_periph_clock_enable(RCC_GPIOB);
    rcc_periph_clock_enable(RCC_GPIOC);
    rcc_periph_clock_enable(RCC_GPIOD);
}