Need help writing a simple blink sketch

Hi, I'm trying to write a simple blink sketch using an STM32F4(07) discovery board, CubeMX and Atollic truestudio. I can't find any walkthrough guides which cover this exact constellation of products, so I'm trying to mix and match and I can't get my code to build properly.

I used the cubeMX program to select pd12-15 as GPIO output and then the debug in sys mode to debug wire (i'm assuming this is appropriate for my discovery board?). The clock configuration seems to be set so I can't alter it (I'm guessing because i've chosen the discovery board which has default settings?) I don't know what to do with the tools section, I just left it blank. I select truestudio in the toolchain/IDE section and open the project.

This creates a project with a lot of stuff that I have no idea about contained within it. it is much more complicated than the code snippet recommended in this tutorial - http://embeddedsystemengineering.blogspot.com/2015/02/stm32f4-discovery-tutorial-1-simple-led.html which is very simple and easy to understand. Instead I get this -

#include "main.h"
 
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
 
int main(void)
{
 
 /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
 HAL_Init();
 
 /* Configure the system clock */
 SystemClock_Config();
 
 /* Initialize all configured peripherals */
 MX_GPIO_Init();
 
 while (1)
 {
	 
 }
}
 
 
void SystemClock_Config(void)
{
 RCC_OscInitTypeDef RCC_OscInitStruct = {0};
 RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
 
 /** Configure the main internal regulator output voltage
 */
 __HAL_RCC_PWR_CLK_ENABLE();
 __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
 /** Initializes the CPU, AHB and APB busses clocks
 */
 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
 RCC_OscInitStruct.HSIState = RCC_HSI_ON;
 RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
 {
 Error_Handler();
 }
 /** Initializes the CPU, AHB and APB busses clocks
 */
 RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
 |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
 RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
 RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
 RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
 RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
 
 if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
 {
 Error_Handler();
 }
}
 
static void MX_GPIO_Init(void)
{
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 
 /* GPIO Ports Clock Enable */
 __HAL_RCC_GPIOD_CLK_ENABLE();
 __HAL_RCC_GPIOA_CLK_ENABLE();
 
 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15, GPIO_PIN_RESET);
 
 /*Configure GPIO pins : PD12 PD13 PD14 PD15 */
 GPIO_InitStruct.Pin = GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
 
}
 
 
void Error_Handler(void)
{
 /* USER CODE BEGIN Error_Handler_Debug */
 /* User can add his own implementation to report the HAL error return state */
 
 /* USER CODE END Error_Handler_Debug */
}
 
#ifdef USE_FULL_ASSERT
/**
 * @brief Reports the name of the source file and the source line number
 * where the assert_param error has occurred.
 * @param file: pointer to the source file name
 * @param line: assert_param error line source number
 * @retval None
 */
void assert_failed(uint8_t *file, uint32_t line)
{
 /* USER CODE BEGIN 6 */
 /* User can add his own implementation to report the file name and line number,
 tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
 /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

Which i almost understand, but I don't know how the code in the other example built for the same discovery board (although with a different IDE) can be so simple in comparison. Nevertheless, this code does not compile - trueStudio says "fatal error: arm_math.h: no such file or directory" Which I don't understand because a) i don't know why I need math.h (it's not called anywhere in the program) and b) if I follow the dropdown boxes in the left bar I can go in to drivers>CMSIS>DSP>source>BasicMathFunctions> arm_shift_q15.c and math.h is listed under there, all of these foldeers are highlighted by a red 'x' in a box, but the compiler can't seem to find the file which I can see following those links??

I also tried to paste the code from the simpler example (from the link above) but this also creates an error.

can anyone help me out?