[lcd] forbid writing outside of current framebuffer memory

Current implementation contains full support for:
- transparent switching between direct and framebuffer rendering modes
- writing characters to framebuffers
- loading frame from memory to physical display

As well as partial support for instruction writes including:
- resetting the display (clears memory, sets cursor at 0:0, switches to increment mode)
- switching between increment/decrement modes
- setting cursor position

Core/Src/PCA9685.c

@@ -40,6 +40,8 @@ int PCA9685_run_test(void)
 				display_write_data_seq("/5 ");
 
 				switch (op_result) {
+				case HAL_OK:
+					break;
 				case HAL_ERROR:
 					display_write_data_seq("ERROR");
 					break;
@@ -70,7 +72,7 @@ int PCA9685_run_test(void)
 		return 1;
 	} else {
 		DISPLAY_SET_CURSOR(1, 1);
-		display_write_data_seq("OK  OUT ENABLED");
+		display_write_data_seq("OK");
 
 		return 0;
 	}

Core/Src/lcd.c

@@ -136,6 +136,12 @@ static void display_write_data_byte_direct(uint8_t code)
 
 static void display_write_data_byte_framebuffer(uint8_t code)
 {
+	if (display_current_frame >= DISPLAY_FRAMES_AVAILABLE)
+		return;
+
+	if (((int) des.cursor_offset >= 32) || ((int) des.cursor_offset < 0))
+		return;
+
 	display_framebuffer[16*2*display_current_frame + des.cursor_offset] = (char) code;
 	des.cursor_offset += des.next ? -1 : 1;
 }

Core/Src/main.c

@@ -46,6 +46,17 @@
 #define WAIT_UNTIL_CB_PRESSED while (!HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) && HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_8))
 #define WAIT_UNTIL_CB_RELEASED while (HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) || !HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_8))
 
+#define UB (GPIOA->IDR & GPIO_PIN_0)
+#define SWT1 !(GPIOC->IDR & GPIO_PIN_11)
+#define SWT2 !(GPIOA->IDR & GPIO_PIN_15)
+#define SWT3 !(GPIOC->IDR & GPIO_PIN_9)
+#define SWT4 !(GPIOC->IDR & GPIO_PIN_6)
+#define SWT5 !(GPIOC->IDR & GPIO_PIN_8)
+
+#define WAIT_UNTIL_ALL_BUTTONS_RELEASED do {} while ( UB || SWT1 || SWT2 || SWT3 || SWT4 || SWT5 )
+
+#define LEN(x) ( sizeof(x) / sizeof((x)[0]) )
+
 /* USER CODE END PD */
 
 /* Private macro -------------------------------------------------------------*/
@@ -68,22 +79,19 @@ extern size_t display_current_frame;
 
 /* USER CODE BEGIN PV */
 
-int ((*executors[])(void)) = {
+static const int ((*executors[])(void)) = {
 		DNI_show_celsius,
-		DNI_show_fahrenheit,
 		PCA9685_run_test,
 		EEPROM_24AA02E48_run_test,
 		CS43L22_run_test,
 		SST25VF016B_run_test,
 		LIS302DL_run_test,
-		LIS302DL_run_test_dynamic,
 		MP45DT02_run_test,
 		LSM9DS1_test_accel,
 		LSM9DS1_test_magnet
 };
 
-void ((*cleanup_functions[])(void)) = {
+static const void ((*cleanup_functions[])(void)) = {
-		NULL,
 		NULL,
 		PCA9685_cleanup,
 		NULL,
@@ -91,29 +99,10 @@ void ((*cleanup_functions[])(void)) = {
 		NULL,
 		NULL,
 		NULL,
-		NULL,
 		LSM9DS1_cleanup_accel,
 		NULL
 };
 
-int delay_between_runs[] = {
-		250,
-		250,
-		-1,
-		-1,
-		-1,
-		-1,
-		-1,
-		200,
-		-1,
-		-1,
-		-1
-		};
-
-size_t current_executor_id = 0;
-
-size_t buttons_interrupt_enabled;
-
 /* USER CODE END PV */
 
 /* Private function prototypes -----------------------------------------------*/
@@ -131,67 +120,7 @@ static void MX_I2S2_Init(void);
 /* Private user code ---------------------------------------------------------*/
 /* USER CODE BEGIN 0 */
 
-void switch_to_next_test(void)
+static void button_init_and_test(void)
-{
-	current_executor_id += 1;
-	current_executor_id %= 11;
-}
-
-void buttons_switch_to_interrupt(void)
-{
-	// save current executor ID
-	size_t tmp = current_executor_id;
-
-	// configure user button
-	GPIO_InitTypeDef GPIO_InitStruct = {0};
-	GPIO_InitStruct.Pin = GPIO_PIN_0;
-	GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
-	GPIO_InitStruct.Pull = GPIO_NOPULL;
-	HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-	HAL_NVIC_SetPriority(EXTI0_IRQn, 0, 0);
-	HAL_NVIC_EnableIRQ(EXTI0_IRQn);
-
-	// configure SW5 (alternative advancing method)
-	GPIO_InitStruct.Pin = GPIO_PIN_8;
-	GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
-	GPIO_InitStruct.Pull = GPIO_NOPULL;
-	HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
-
-	HAL_NVIC_SetPriority(EXTI9_5_IRQn, 0, 0);
-	HAL_NVIC_EnableIRQ(EXTI9_5_IRQn);
-
-	// restore current executor ID
-	current_executor_id = tmp;
-
-	// set interrupt mode flag
-	buttons_interrupt_enabled = 1;
-}
-
-void buttons_switch_to_input(void)
-{
-	// configure user button
-	GPIO_InitTypeDef GPIO_InitStruct = {0};
-	GPIO_InitStruct.Pin = GPIO_PIN_0;
-	GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-	GPIO_InitStruct.Pull = GPIO_NOPULL;
-	HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
-	HAL_NVIC_DisableIRQ(EXTI0_IRQn);
-
-	// configure SW5 (alternative input method)
-	GPIO_InitStruct.Pin = GPIO_PIN_8;
-	GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-	GPIO_InitStruct.Pull = GPIO_NOPULL;
-	HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
-
-	HAL_NVIC_DisableIRQ(EXTI9_5_IRQn);
-
-	// clear interrupt mode flag
-	buttons_interrupt_enabled = 0;
-}
-
-void button_init_and_test(void)
 {
 	// letting the buttons be tested
 	display_write_data_seq("Fill any bar:");
@@ -201,11 +130,11 @@ void button_init_and_test(void)
 	size_t pressed_elements;
 
 	uint32_t sw_button_locations[5][2] = {
-			{GPIOC, GPIO_PIN_11},
+			{(uint32_t) GPIOC, (uint32_t) GPIO_PIN_11},
-			{GPIOA, GPIO_PIN_15},
+			{(uint32_t) GPIOA, (uint32_t) GPIO_PIN_15},
-			{GPIOC, GPIO_PIN_9},
+			{(uint32_t) GPIOC, (uint32_t) GPIO_PIN_9},
-			{GPIOC, GPIO_PIN_6},
+			{(uint32_t) GPIOC, (uint32_t) GPIO_PIN_6},
-			{GPIOC, GPIO_PIN_8}
+			{(uint32_t) GPIOC, (uint32_t) GPIO_PIN_8}
 	};
 
 	do {
@@ -226,7 +155,7 @@ void button_init_and_test(void)
 		for (size_t i = 0; i < 5; i++) {
 			pressed_elements >>= 1;
 
-			size_t input = !HAL_GPIO_ReadPin(sw_button_locations[i][0], sw_button_locations[i][1]);
+			size_t input = !HAL_GPIO_ReadPin((GPIO_TypeDef *) sw_button_locations[i][0], sw_button_locations[i][1]);
 
 			if (input) {
 				pressed_elements |= 0x20;
@@ -243,16 +172,16 @@ void button_init_and_test(void)
 	display_write_data_seq("Release buttons");
 
 	GPIOD->ODR = 0x1000;
-	HAL_Delay(500);
+	HAL_Delay(300);
 	GPIOD->ODR = 0x2000;
-	HAL_Delay(500);
+	HAL_Delay(300);
 	GPIOD->ODR = 0x4000;
-	HAL_Delay(500);
+	HAL_Delay(300);
 	GPIOD->ODR = 0x8000;
-	HAL_Delay(500);
+	HAL_Delay(300);
 
-	// waiting for control buttons to be released
+	// waiting for all buttons to be released
-	WAIT_UNTIL_CB_RELEASED;
+	WAIT_UNTIL_ALL_BUTTONS_RELEASED;
 	GPIOD->ODR = 0x0000;
 	HAL_Delay(200);
 }
@@ -294,7 +223,6 @@ int main(void)
   MX_TIM2_Init();
   MX_I2S2_Init();
   /* USER CODE BEGIN 2 */
-  buttons_interrupt_enabled = 0;
 
   HAL_TIM_Base_Start(&htim2);
   TIM2->CNT = 0;
@@ -310,9 +238,7 @@ int main(void)
   size_t successful_tests = 0;
   size_t failed_tests = 0;
 
-  //display_to_framebuffer();
+  for (display_current_frame = 1; display_current_frame < LEN(executors)+1; display_current_frame++)
-
-  for (display_current_frame = 1; display_current_frame < 12; display_current_frame++)
   {
 	  DISPLAY_CLEAR;
 	  display_write_data_seq("Testing...");
@@ -340,8 +266,6 @@ int main(void)
 		  cleanup_functions[display_current_frame-1]();
 
 	  display_to_direct();
-
-	  HAL_Delay(150);
   }
 
   // render final result to first framebuffer
@@ -363,94 +287,43 @@ int main(void)
 
   display_to_direct();
 
+  /* USER CODE END 2 */
 
-  if (buttons_interrupt_enabled)
+  /* Infinite loop */
-	  buttons_switch_to_input();
+  /* USER CODE BEGIN WHILE */
-
   while (1) {
-	  // wait until all buttons are released
+	  WAIT_UNTIL_ALL_BUTTONS_RELEASED;
-	  while (
-			  (GPIOA->IDR & GPIO_PIN_0) ||
-			  !(GPIOC->IDR & GPIO_PIN_11) ||
-			  !(GPIOC->IDR & GPIO_PIN_8) ||
-			  !(GPIOC->IDR & GPIO_PIN_9) ||
-			  !(GPIOC->IDR & GPIO_PIN_6) ||
-			  !(GPIOA->IDR & GPIO_PIN_15)
-	  ) { asm("nop"); }
 
 	  display_load(display_current_frame);
 
 	  while (1) {
 		  // go to next report
-		  if (
+		  if (UB || SWT1 || SWT5) {
-				  (GPIOA->IDR & GPIO_PIN_0) ||
-				  !(GPIOC->IDR & GPIO_PIN_11) ||
-				  !(GPIOC->IDR & GPIO_PIN_8)
-		  ) {
 			  display_current_frame += 1;
-			  display_current_frame %= 12;
+			  display_current_frame %= LEN(executors)+1;
 			  break;
 		  }
 
 		  // go to previous report
-		  else if (
+		  else if (SWT3 || SWT4) {
-				  !(GPIOC->IDR & GPIO_PIN_9) ||
-		  	  	  !(GPIOC->IDR & GPIO_PIN_6)
-	  	  ) {
 			  display_current_frame -= 1;
 
-			  if (display_current_frame == 0xFFFFFFFFU)
+			  if ((int) display_current_frame == -1)
-				  display_current_frame = 11;
+				  display_current_frame = LEN(executors);
 
 			  break;
 		  }
 
 		  // return to summary frame
-		  else if (
+		  else if (SWT2) {
-				  !(GPIOA->IDR & GPIO_PIN_15)
-		  ) {
 			  display_current_frame = 0;
 			  break;
 		  }
 	  }
-  }
-
-  /* USER CODE END 2 */
-
-  /* Infinite loop */
-  /* USER CODE BEGIN WHILE */
-
-  /*
-  while (1)
-  {
-	if (delay_between_runs[current_executor_id] == -1 && buttons_interrupt_enabled)
-		buttons_switch_to_input();
-	else if (delay_between_runs[current_executor_id] != -1 && !buttons_interrupt_enabled)
-		buttons_switch_to_interrupt();
-
-	executors[current_executor_id]();
-
-	if (delay_between_runs[current_executor_id] == -1) {
-		WAIT_UNTIL_CB_PRESSED;
-		HAL_Delay(150);
-		GPIOD->BSRR = 0x1000;
-
-		WAIT_UNTIL_CB_RELEASED;
-		HAL_Delay(150);
-		GPIOD->BSRR = 0x1000 << 16;
-
-		if (cleanup_functions[current_executor_id])
-			cleanup_functions[current_executor_id]();
-
-		switch_to_next_test();
-	} else {
-		HAL_Delay(delay_between_runs[current_executor_id]);
-	}
-	*/
     /* USER CODE END WHILE */
 
     /* USER CODE BEGIN 3 */
-  //}
+  }
   /* USER CODE END 3 */
 }
 

Core/Src/stm32f4xx_it.c

@@ -204,7 +204,7 @@ void EXTI0_IRQHandler(void)
 {
 	GPIOD->ODR = 0x1000;
 
-	switch_to_next_test();
+	//switch_to_next_test();
 
 	for (int i = 300000; i > 0; i--) asm("nop");
 
@@ -217,7 +217,7 @@ void EXTI9_5_IRQHandler(void)
 {
 	GPIOD->ODR = 0x1000;
 
-	switch_to_next_test();
+	//switch_to_next_test();
 
 	for (int i = 300000; i > 0; i--) asm("nop");