Question
Problem with using DMA with SPI
Hello everyone,
I am currently working on an STM32F411VET6 DISCOVERY board project where I am using DMA for SPI communication with an SSD1331 OLED display. However, I am encountering an issue where the system enters an infinite loop of DMA interrupts. The interrupts are repeatedly triggered, and the program does not seem to proceed past the DMA interrupt handler (HAL_DMA_IRQHandler). I also get this weird call on my stack called: <signal handler called>() at 0xfffffff9
I'm really new to this stuff so i'm sorry for any obvious questions in advance. Here is my code:
int main(void)
{
/* USER CODE BEGIN 1 */
uint8_t level = 0;
uint8_t game_is_running = 1;
uint8_t i, j = 4;
uint8_t * frame_buffer = malloc(sizeof(uint8_t));
if(frame_buffer == NULL)
Error_Handler();
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_ADC1_Init();
MX_SPI1_Init();
MX_TIM2_Init();
MX_TIM10_Init();
/* USER CODE BEGIN 2 */
//ADC1/TIM2/OLED INICIALIZATION
HAL_TIM_Base_Start(&htim2);
HAL_TIM_Base_Start_IT(&htim10);
HAL_DMA_Init(&hdma_spi1_tx);
if (HAL_ADC_Start_DMA(&hadc1, (uint32_t*) ADC_Buffer, 4) != HAL_OK)
Error_Handler();
ssd1331_init(); //<-stops at this function
ssd1331_draw_bitmap(0, 0, image_data_grass_texture, 96, 64, 0);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (game_is_running) {
switch (level) {
case 0:
uint8_t lg_flag = 0;
frame_buffer = realloc(frame_buffer, sizeof(uint8_t)*64*19*16);
if(frame_buffer == NULL)
Error_Handler();
write_to_buffer(0, 0, image_data_grass_texture, 64, 19, frame_buffer);
while (level == 0) {
if (frame_update&&dma_transfer_complete) {
if ((i < 9) && (lg_flag == 0)) {
i++;
ssd1331_set_window(16, 80, j, i + 15);
write_to_buffer(0, 0, image_data_golf_logo, 64, 15, frame_buffer);
if(HAL_SPI_Transmit_DMA(&hspi1, frame_buffer, sizeof(uint8_t)*64*19) == HAL_OK)
dmacheck = 1;
j = i;
dma_transfer_complete = 0;
frame_update = 0;
} else {
lg_flag = 1;
j--;
ssd1331_set_window(16, 80, j, i + 15);
write_to_buffer(0, 0, image_data_golf_logo, 64, 15, frame_buffer);
if(HAL_SPI_Transmit_DMA(&hspi1, frame_buffer, sizeof(uint8_t)*64*19))
dmacheck = 1;
dma_transfer_complete = 0;
frame_update = 0;
i = j;
if ((i >= 4) && (i < 5))
lg_flag = 0;
}
}
}
break;
};
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
free(frame_buffer);
/* USER CODE END 3 */
}
void ssd1331_init(void)
{
__SSD1331_RES_SET(); //RES set
__SSD1331_CS_SET();
ssd1331_write_byte(DISPLAY_OFF, SSD1331_CMD); //Display Off<--stop here
ssd1331_write_byte(SET_CONTRAST_A, SSD1331_CMD); //Set contrast for color A
ssd1331_write_byte(0xFF, SSD1331_CMD); //145 0x91
ssd1331_write_byte(SET_CONTRAST_B, SSD1331_CMD); //Set contrast for color B
ssd1331_write_byte(0xFF, SSD1331_CMD); //80 0x50
ssd1331_write_byte(SET_CONTRAST_C, SSD1331_CMD); //Set contrast for color C
ssd1331_write_byte(0xFF, SSD1331_CMD); //125 0x7D
ssd1331_write_byte(MASTER_CURRENT_CONTROL, SSD1331_CMD);//master current control
ssd1331_write_byte(0x06, SSD1331_CMD); //6
ssd1331_write_byte(SET_PRECHARGE_SPEED_A, SSD1331_CMD);//Set Second Pre-change Speed For ColorA
ssd1331_write_byte(0x64, SSD1331_CMD); //100
ssd1331_write_byte(SET_PRECHARGE_SPEED_B, SSD1331_CMD);//Set Second Pre-change Speed For ColorB
ssd1331_write_byte(0x78, SSD1331_CMD); //120
ssd1331_write_byte(SET_PRECHARGE_SPEED_C, SSD1331_CMD);//Set Second Pre-change Speed For ColorC
ssd1331_write_byte(0x64, SSD1331_CMD); //100
ssd1331_write_byte(SET_REMAP, SSD1331_CMD); //set remap & data format
ssd1331_write_byte(0x72, SSD1331_CMD); //0x72
ssd1331_write_byte(SET_DISPLAY_START_LINE, SSD1331_CMD);//Set display Start Line
ssd1331_write_byte(0x0, SSD1331_CMD);
ssd1331_write_byte(SET_DISPLAY_OFFSET, SSD1331_CMD); //Set display offset
ssd1331_write_byte(0x0, SSD1331_CMD);
ssd1331_write_byte(NORMAL_DISPLAY, SSD1331_CMD); //Set display mode
ssd1331_write_byte(SET_MULTIPLEX_RATIO, SSD1331_CMD); //Set multiplex ratio
ssd1331_write_byte(0x3F, SSD1331_CMD);
ssd1331_write_byte(SET_MASTER_CONFIGURE, SSD1331_CMD); //Set master configuration
ssd1331_write_byte(0x8E, SSD1331_CMD);
ssd1331_write_byte(POWER_SAVE_MODE, SSD1331_CMD); //Set Power Save Mode
ssd1331_write_byte(0x00, SSD1331_CMD); //0x00
ssd1331_write_byte(PHASE_PERIOD_ADJUSTMENT, SSD1331_CMD);//phase 1 and 2 period adjustment
ssd1331_write_byte(0x31, SSD1331_CMD); //0x31
ssd1331_write_byte(DISPLAY_CLOCK_DIV, SSD1331_CMD); //display clock divider/oscillator frequency
ssd1331_write_byte(0xF0, SSD1331_CMD);
ssd1331_write_byte(SET_PRECHARGE_VOLTAGE, SSD1331_CMD);//Set Pre-Change Level
ssd1331_write_byte(0x3A, SSD1331_CMD);
ssd1331_write_byte(SET_V_VOLTAGE, SSD1331_CMD); //Set vcomH
ssd1331_write_byte(0x3E, SSD1331_CMD);
ssd1331_write_byte(DEACTIVE_SCROLLING, SSD1331_CMD); //disable scrolling
ssd1331_write_byte(NORMAL_BRIGHTNESS_DISPLAY_ON, SSD1331_CMD);//set display on
//ssd1331_fill_rect(0, 0, 96, 64, 0x0000);
ssd1331_clear_screen(0x0000);
}
static void ssd1331_write_byte(uint8_t chData, uint8_t chCmd)
{
if (chCmd) {
__SSD1331_DC_SET();
} else {
__SSD1331_DC_CLR();
}
__SSD1331_CS_CLR();
__SSD1331_WRITE_BYTE(chData); //<-then here
__SSD1331_CS_SET();
__SSD1331_DC_SET();
}
#define __SSD1331_WRITE_BYTE(__DATA) HAL_SPI_Transmit_DMA(&hspi1, &__DATA, 1)