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#define buffer_in_spi_ram 1

#if buffer_in_spi_ram
    #define pixels_size 153600  // 153600 pixels = 307200 bytes.
#else
    #define pixels_size 19200  // 19200 pixels = 38400 bytes.
#endif

#define hw_lcd_dma_command_buf_size 32  // 32 bytes.


DMA_ATTR dma_descriptor_t* dma_desc_buf_a = NULL;
DMA_ATTR dma_descriptor_t* dma_desc_buf_b = NULL;
DMA_ATTR dma_descriptor_t* dma_desc_buf_command = NULL;

DMA_ATTR uint16_t* p_buffer_a = NULL;
DMA_ATTR uint16_t* p_buffer_b = NULL;
DMA_ATTR uint8_t* p_buf_command = NULL;

static esp_err_t hw_lcd_dma_alloc_memory()
{
    dma_desc_buf_a = (dma_descriptor_t*) heap_caps_calloc( descriptor_size, sizeof(dma_descriptor_t), MALLOC_CAP_8BIT | MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL );
    dma_desc_buf_b = (dma_descriptor_t*) heap_caps_calloc( descriptor_size, sizeof(dma_descriptor_t), MALLOC_CAP_8BIT | MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL );
    dma_desc_buf_command = (dma_descriptor_t*) heap_caps_calloc( 1, sizeof(dma_descriptor_t), MALLOC_CAP_8BIT | MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL ); 

    p_buf_command = (uint8_t*) heap_caps_malloc( hw_lcd_dma_command_buf_size * sizeof(uint8_t), MALLOC_CAP_8BIT | MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL );

#if buffer_in_spi_ram    
    p_buffer_a = (uint16_t*) heap_caps_aligned_alloc( 1, pixels_size * sizeof(uint16_t), MALLOC_CAP_8BIT | MALLOC_CAP_SPIRAM );
    p_buffer_b = (uint16_t*) heap_caps_aligned_alloc( 1, pixels_size * sizeof(uint16_t), MALLOC_CAP_8BIT | MALLOC_CAP_SPIRAM );
#else
    p_buffer_a = (uint16_t*) heap_caps_malloc( pixels_size * sizeof(uint16_t), MALLOC_CAP_8BIT | MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL );
    p_buffer_b = (uint16_t*) heap_caps_malloc( pixels_size * sizeof(uint16_t), MALLOC_CAP_8BIT | MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL );
#endif

    if( dma_desc_buf_a == NULL || dma_desc_buf_b == NULL || dma_desc_buf_command == NULL || p_buffer_a == NULL || p_buffer_b == NULL || p_buf_command == NULL )
    {    
        if(dma_desc_buf_a == NULL)        ESP_LOGI(HW_LCD_DMA_TAG, LOG_USER("dma_desc_buf_a == NULL"));        
        if(dma_desc_buf_b == NULL)        ESP_LOGI(HW_LCD_DMA_TAG, LOG_USER("dma_desc_buf_b == NULL"));
        if(dma_desc_buf_command == NULL)  ESP_LOGI(HW_LCD_DMA_TAG, LOG_USER("dma_desc_buf_command == NULL"));       
        if(p_buffer_a == NULL)            ESP_LOGI(HW_LCD_DMA_TAG, LOG_USER("p_buffer_a == NULL")); 
        if(p_buffer_b == NULL)            ESP_LOGI(HW_LCD_DMA_TAG, LOG_USER("p_buffer_b == NULL"));
        if(p_buf_command == NULL)         ESP_LOGI(HW_LCD_DMA_TAG, LOG_USER("p_buf_command == NULL"));
       
        heap_caps_free(dma_desc_buf_a);
        heap_caps_free(dma_desc_buf_b);
        heap_caps_free(dma_desc_buf_command);
        heap_caps_free(p_buffer_a);
        heap_caps_free(p_buffer_b);         
        heap_caps_free(p_buf_command);
    
        dma_desc_buf_a = NULL;
        dma_desc_buf_b = NULL;
        dma_desc_buf_command = NULL;        
        p_buffer_a = NULL;
        p_buffer_b = NULL;
        p_buf_command = NULL;

        return ESP_ERR_NO_MEM;
    }

    return ESP_OK;
}