EPIC

HAL EPIC模块提供抽象的软件接口操作硬件EPIC模块，EPIC为一个2D图形引擎，它支持的特性

主要特性

alpha混叠两幅图片并保存到输出buffer
以任意点为中心旋转图片（前景图片）, 将旋转后的图片与背景图片混叠，保存混叠后的结果到输出buffer
缩小/放到图片（前景图），将缩放后的图片与背景图混叠，保存混叠后的结果到输出buffer
一次GPU操作支持先旋转后缩放，不需要中间缓存buffer
在给定buffer中填充不透明或半透明色
所有的图形操作支持轮询和中断模式
输入和输出颜色格式不同即可实现颜色格式的自动转换
混叠的两幅图大小可以不同并部分重叠，还可以指定混叠后区域的一部分作为输出区域写入输出buffer
背景图和输出图可以复用同一个buffer，比如背景图和输出图都使用frame buffer
输入图片格式支持EZIP
支持小数坐标混叠(55X 不支持)

输入输出限制

功能	55X	58X	56X	54X
横向缩放	3.8, 即缩小8倍，放大256倍, 精度1/256	10.16, 即缩小1024倍，放大65536倍, 精度1/65536	同58X	同58X
纵向缩放	横向纵向缩放倍数固定一样，不能分开配置	10.16, 即缩小1024倍，放大65536倍, 精度1/65536，且可以和横向缩放系数不一样	同58X	同58X
旋转角度	[0 ~ 3600], 单位为0.1度	同55X	同55X	同55X
水平镜像	支持	支持	支持	支持
垂直镜像	不支持	不支持	不支持	支持

备注

旋转和缩放支持同时进行，并且支持同一锚点, 支持任意锚点。
镜像支持任意锚点,且不能和旋转、缩放同时进行。
前景、背景、输出区域的并集不超过1024*1024像素(其中前景指绕任意锚点变形后的图像区域(包括锚点和旋转前图片))

例如, 前景图为绕图片外锚点旋转并放大后, 与背景、输出区域的并集不超过1024

颜色格式支持

输入颜色格式支持	55X	58X	56X	54X
RGB565/ARGB8565/RGB888/ARGB88888	Y	Y	Y	Y
L8	N	Y	Y	Y
A4/A8 (Mask,Overwrite,Fill)	N	Y	Y	Y
YUV(YUYV/UYVY/iYUV)	N	N	Y	Y
A2 (Fill)	N	N	N	Y

输出颜色格式支持	55X	58X	56X	54X
RGB565/ARGB8565/RGB888/ARGB88888	Y	Y	Y	Y

关图像问题的建议

用于旋转或缩放的图像在最外一圈加上一些透明像素(或者背景色),防止缩放时出现切边和旋转时出现锯齿
为防止缩放出现不连续,对于连续缩放场景缩放系数差值要大于1/256(即缩放精度不能超过1/256)
虽然旋转和缩放可以同时进行，但建议一次只执行一种变换以保证更好的输出图形质量
放大时建议使用图片左上角作为锚点，防止出现锚点抖动
EZIP格式的图片不能用于旋转

详细的API说明请参考EPIC 。

颜色在sram的存储格式

	bit31~bit25	bit24~bit17	bit16~bit8	bit7~bit0
RGB565	/	/	R4~R0G5~G3	G2~G0B4~B0
ARGB8565	/	A7 ~ A0	R4~R0G5~G3	G2~G0B4~B0
RGB888	/	R7 ~ R0	G7 ~ G0	B7 ~ B0
ARGB8888	A7 ~ A0	R7 ~ R0	G7 ~ G0	B7 ~ B0
A8	D7 ~ D0	C7~C0	B7~B0	A7~A0
A4	/	/	D3~D0C3~C0	B3~B0A3~A0
A2	/	/	H1H0G1G0F1F0E1E0	D1D0C1C0B1B0A1A0

备注

颜色数据均是紧密存放，在A2/A4/A8格式中ABCDEFGH代表像素点(从左到右显示)

使用HAL EPIC

首先调用 HAL_EPIC_Init() 初始化HAL EPIC. 在 EPIC_HandleTypeDef 结构中需指定EPIC实例（即使用的EPIC硬件模块），芯片只有一个EPIC实例 hwp_epic 。初始化之后即可调用各种图形操作的接口处理数据。

例如，

static EPIC_HandleTypeDef epic_handle;

void init_epic(void) 
{ 	// Initialize driver and enable EPIC IRQ
	HAL_NVIC_SetPriority(EPIC_IRQn, 3, 0);
	HAL_NVIC_EnableIRQ(EPIC_IRQn);
	
	epic_handle.Instance = hwp_epic;
	HAL_EPIC_Init(&epic_handle);
}

/* EPIC IRQ Handler */
void EPIC_IRQHandler(void)
{
    HAL_EPIC_IRQHandler(&epic_handle);
}

HAL_EPIC_Rotate_IT() 用于中断模式的混叠、旋转和缩放操作， HAL_EPIC_BlendStart_IT() 用于中断模式的混叠操作，需要在中断服务程序中调用 HAL_EPIC_IRQHandler() 处理中断。 @note HAL_EPIC_Rotate_IT() 实现了所有 HAL_EPIC_BlendStart_IT() 的功能，对于只是混叠的场景，建议使用 HAL_EPIC_BlendStart_IT() ，因为它的叠图吞吐率更高

混叠示例

如图1所示，示例blend_img_1与blend_img_2中，前景图所在区域的坐标为(10, 20)~(59,79)，背景图所在区域的坐标为(0,0)~(99,99), 输出区域坐标为(5,10)~(44,59)，所有坐标均为一个坐标系中的数值，体现三个区域的相对位置关系，前景图以39%%的透明度与背景混叠，混叠后(5,10)~(44,59)区域的颜色值被顺序写入到输出buffer，其中与前景重叠的部分（画叉的部分，即区域[10,20]~[44,59]）为混叠后的颜色，非重叠部分则是背景图中的颜色。需要注意的是所有的数据buffer均为对应区域左上角像素的存放地址，例如fg_img.data指向前景图的坐标(10,20)所在像素的颜色值，outout_img.data指向输出区域的左上角像素，即(5,10)的颜色值。

Figure 1: Blending

背景图buffer与输出buffer不同

使用HAL_EPIC_Rotate_IT

void epic_cplt_callback(EPIC_HandleTypeDef *epic)
{
    /* release the semaphore to indicate epic operation done */
    sema_release(epic_sema);
}

/* blend the foreground with background image using 100 opacity (0 is transparent, 255 is opaque)
 * output specified blended region to another buffer.
 * 
 */
void blend_img_1(void)
{
    EPIC_BlendingDataType fg_img;
    EPIC_BlendingDataType bg_img;
    EPIC_BlendingDataType output_img;
    EPIC_TransformCfgTypeDef trans_cfg;
    HAL_StatusTypeDef ret;     
    
    /* foreground image, its coordinate (10,20)~(59,79) , buffer size is 50*60 */
    HAL_EPIC_BlendDataInit(&fg_img);
    fg_img.data = fg_img_buf;
    fg_img.x_offset = 10;
    fg_img.y_offset = 20;
    /* blending area width */
    fg_img.width = 50;
    /* blending area height */
    fg_img.height = 60;
    /* image width, it can be different from fg_img.width */
    fg_img.total_width = 50;
    fg_img.color_mode = EPIC_COLOR_RGB565;
    fg_img.color_en = false;
    
    /* background image, its coordinate (0,0)~(99,99), buffer size is 100*100 */
    HAL_EPIC_BlendDataInit(&bg_img);
    bg_img.data = bg_img_buf;
    bg_img.x_offset = 0;
    bg_img.y_offset = 0;
    bg_img.width = 100;
    bg_img.height = 100;
    bg_img.total_width = 100;
    bg_img.color_mode = EPIC_COLOR_RGB565;
    bg_img.color_en = false;
    
    /* output image, its coordinate (5,10)~(44,59), buffer size is 40*50 */
    HAL_EPIC_BlendDataInit(&output_img);
    output_img.data = output_img_buf;
    output_img.x_offset = 5;
    output_img.y_offset = 10;
    output_img.width = 40;
    output_img.height = 50;
    output_img.total_width = 40;
    output_img.color_mode = EPIC_COLOR_RGB565;
    output_img.color_en = false;
    
    /* set complete callback */
    epic_handle.XferCpltCallback = epic_cplt_callback;
    
    /* no rotation and scaling, opacity 100 
     * start EPIC in interrupt mode
     */
    HAL_EPIC_RotDataInit(&trans_cfg);

    
    ret = HAL_EPIC_Rotate_IT(&epic_handle, &trans_cfg, &fg_img, &bg_img, &output_img, 100);
    /* check ret value if any error happens */
    ...
    /* wait for completion */
    sema_take(epic_sema);
}

使用HAL_EPIC_BlendStart_IT

void epic_cplt_callback(EPIC_HandleTypeDef *epic)
{
    /* release the semaphore to indicate epic operation done */
    sema_release(epic_sema);
}

/* blend the foreground with background image using 100 opacity (0 is transparent, 255 is opaque)
 * output specified blended region to another buffer.
 * 
 */
void blend_img_1(void)
{
    EPIC_BlendingDataType fg_img;
    EPIC_BlendingDataType bg_img;
    EPIC_BlendingDataType output_img;
    HAL_StatusTypeDef ret;     
    
    /* foreground image, its coordinate (10,20)~(59,79) , buffer size is 50*60 */
    HAL_EPIC_BlendDataInit(&fg_img);
    fg_img.data = fg_img_buf;
    fg_img.x_offset = 10;
    fg_img.y_offset = 20;
    /* blending area width */
    fg_img.width = 50;
    /* blending area height */
    fg_img.height = 60;
    /* image width, it can be different from fg_img.width */
    fg_img.total_width = 50;
    fg_img.color_mode = EPIC_COLOR_RGB565;
    fg_img.color_en = false;
    
    /* background image, its coordinate (0,0)~(99,99), buffer size is 100*100 */
    HAL_EPIC_BlendDataInit(&bg_img);
    bg_img.data = bg_img_buf;
    bg_img.x_offset = 0;
    bg_img.y_offset = 0;
    bg_img.width = 100;
    bg_img.height = 100;
    bg_img.total_width = 100;
    bg_img.color_mode = EPIC_COLOR_RGB565;
    bg_img.color_en = false;
    
    /* output image, its coordinate (5,10)~(44,59), buffer size is 40*50 */
    HAL_EPIC_BlendDataInit(&output_img);
    output_img.data = output_img_buf;
    output_img.x_offset = 5;
    output_img.y_offset = 10;
    output_img.width = 40;
    output_img.height = 50;
    output_img.total_width = 40;
    output_img.color_mode = EPIC_COLOR_RGB565;
    output_img.color_en = false;
    
    /* set complete callback */
    epic_handle.XferCpltCallback = epic_cplt_callback;
    
    ret = HAL_EPIC_BlendStart_IT(&epic_handle, &fg_img, &bg_img, &output_img, 100);
    /* check ret value if any error happens */
    ...    
    /* wait for completion */
    sema_take(epic_sema);
}

背景图buffer与输出buffer相同

blend_img_2展示了输出buffer复用背景图buffer的场景，这也是最常使用的，即frame buffer作为背景图buffer和输出buffer，这种情况下背景图buffer中的(10,20)~(44,59)区域所在的颜色值会被修改为混叠后的颜色，其他位置的颜色值保持不变，需要注意output_img.width和output_img.total_width的设置，output_img.width表示输出区域的宽度，即44-5+1=40，但output_img.total_width表示输出buffer的宽度，因为输出buffer对应的图形大小为100*100，所以output_img.total_width应设为100，这样EPIC在写完一行40个像素的数据后，会跳过余下的60个像素，继续更新下一行的数据。 fg_img和bg_img的width和total_width也是相同的含义。

使用HAL_EPIC_Rotate_IT

void epic_cplt_callback(EPIC_HandleTypeDef *epic)
{
    /* release the semaphore to indicate epic operation done */
    sema_release(epic_sema);
}

/* blend the foreground with background image using 100 opacity (0 is transparent, 255 is opaque)
 * output buffer is same as background image buffer, usually they're both frame buffer.
 * 
 */
void blend_img_2(void)
{
    EPIC_BlendingDataType fg_img;
    EPIC_BlendingDataType bg_img;
    EPIC_BlendingDataType output_img;
    EPIC_TransformCfgTypeDef trans_cfg;
    HAL_StatusTypeDef ret;         
    uint32_t buffer_start_offset;    
    
    /* foreground image, its coordinate (10,20)~(59,79), buffer size is 50*60 */
    HAL_EPIC_BlendDataInit(&fg_img);
    fg_img.data = fg_img_buf;
    fg_img.x_offset = 10;
    fg_img.y_offset = 20;
    fg_img.width = 50;
    fg_img.height = 60;
    fg_img.total_width = 50;
    fg_img.color_mode = EPIC_COLOR_RGB565;
    fg_img.color_en = false;
    
    /* background image, its coordinate (0,0)~(99,99), buffer size is 100*100 */
    HAL_EPIC_BlendDataInit(&bg_img);
    bg_img.data = bg_img_buf;
    bg_img.x_offset = 0;
    bg_img.y_offset = 0;
    bg_img.width = 100;
    bg_img.height = 100;
    bg_img.total_width = 100;
    bg_img.color_mode = EPIC_COLOR_RGB565;
    bg_img.color_en = false;
    
    /* output image, share the same buffer as bg_img_buf,
       output area is (5,10)~(44,59), buffer size is 100*100 */
    HAL_EPIC_BlendDataInit(&output_img);
    /* topleft pixel is (5, 10), skip (10*100+5) pixels */
    buffer_start_offset = (10 - 0) * 100 * 2 + (5 - 0) * 2;
    output_img.data = (uint8_t *)((uint32_t)bg_img_buf + buffer_start_offset);
    /* output area topleft coordinate */
    output_img.x_offset = 5;
    output_img.y_offset = 10;
    /* output area width */
    output_img.width = 40;
    /* output area height */
    output_img.height = 50;
    /* output buffer width, it's different from output_img.width */
    output_img.total_width = 100;
    output_img.color_mode = EPIC_COLOR_RGB565;
    output_img.color_en = false;
    
    /* set complete callback */
    epic_handle.XferCpltCallback = epic_cplt_callback;

    /* no rotation and scaling, opacity 100 
     * start EPIC in interrupt mode
     */
    HAL_EPIC_RotDataInit(&trans_cfg);

    
    ret = HAL_EPIC_Rotate_IT(&epic_handle, &trans_cfg, &fg_img, &bg_img, &output_img, 100);
    /* check ret value if any error happens */
    ...    
    /* wait for completion */
    sema_take(epic_sema);
}

使用HAL_EPIC_BlendStart_IT

void epic_cplt_callback(EPIC_HandleTypeDef *epic)
{
    /* release the semaphore to indicate epic operation done */
    sema_release(epic_sema);
}

/* blend the foreground with background image using 100 opacity (0 is transparent, 255 is opaque)
 * output buffer is same as background image buffer, usually they're both frame buffer.
 * 
 */
void blend_img_2(void)
{
    EPIC_BlendingDataType fg_img;
    EPIC_BlendingDataType bg_img;
    EPIC_BlendingDataType output_img;
    HAL_StatusTypeDef ret;         
    uint32_t buffer_start_offset;    
    
    /* foreground image, its coordinate (10,20)~(59,79), buffer size is 50*60 */
    HAL_EPIC_BlendDataInit(&fg_img);
    fg_img.data = fg_img_buf;
    fg_img.x_offset = 10;
    fg_img.y_offset = 20;
    fg_img.width = 50;
    fg_img.height = 60;
    fg_img.total_width = 50;
    fg_img.color_mode = EPIC_COLOR_RGB565;
    fg_img.color_en = false;
    
    /* background image, its coordinate (0,0)~(99,99), buffer size is 100*100 */
    HAL_EPIC_BlendDataInit(&bg_img);
    bg_img.data = bg_img_buf;
    bg_img.x_offset = 0;
    bg_img.y_offset = 0;
    bg_img.width = 100;
    bg_img.height = 100;
    bg_img.total_width = 100;
    bg_img.color_mode = EPIC_COLOR_RGB565;
    bg_img.color_en = false;
    
    /* output image, share the same buffer as bg_img_buf,
       output area is (5,10)~(44,59), buffer size is 100*100 */
    HAL_EPIC_BlendDataInit(&output_img);
    /* topleft pixel is (5, 10), skip (10*100+5) pixels */
    buffer_start_offset = (10 - 0) * 100 * 2 + (5 - 0) * 2;
    output_img.data = (uint8_t *)((uint32_t)bg_img_buf + buffer_start_offset);
    /* output area topleft coordinate */
    output_img.x_offset = 5;
    output_img.y_offset = 10;
    /* output area width */
    output_img.width = 40;
    /* output area height */
    output_img.height = 50;
    /* output buffer width, it's different from output_img.width */
    output_img.total_width = 100;
    output_img.color_mode = EPIC_COLOR_RGB565;
    output_img.color_en = false;
    
    /* set complete callback */
    epic_handle.XferCpltCallback = epic_cplt_callback;

    ret = HAL_EPIC_BlendStart_IT(&epic_handle, &fg_img, &bg_img, &output_img, 100);
    /* check ret value if any error happens */
    ...
    /* wait for completion */
    sema_take(epic_sema);
}

旋转示例

如图2所示，示例rotate_img将位于(10,20)~(59,79)的前景图以图中心为轴顺时针旋转30度，与背景图混叠后更新背景图对应位置的颜色，落在旋转后图形外的像素仍旧保持背景图的颜色。由于旋转后图形覆盖的矩形区域会扩大(即[x0,y0]~[x1,y1])，为了保证旋转后的图形能被完整的显示出来，可以简单的将输出区域设成最大，HAL将自动计算旋转后的矩形区域，当背景图buffer与输出buffer相同时, 只会更新输出buffer中被旋转区域覆盖的像素点的颜色。

Figure 1: Rotation

/* rotate the foreground image by 30 degree (clockwisely) and blend it with background using 100 opacity (0 is transparent, 255 is opaque)
 * output data is written back to background image buffer, it can also output to another buffer like blend_img_1.
 * 
 */
void rotate_img(void)
{
    EPIC_BlendingDataType fg_img;
    EPIC_BlendingDataType bg_img;
    EPIC_BlendingDataType output_img;
    EPIC_TransformCfgTypeDef trans_cfg;
    HAL_StatusTypeDef ret;         
    
    /* foreground image, its coordinate (10,20)~(59,79) before rotation, buffer size is 50*60 */
    HAL_EPIC_BlendDataInit(&fg_img);
    fg_img.data = fg_img_buf;
    fg_img.x_offset = 10;
    fg_img.y_offset = 20;
    fg_img.width = 50;
    fg_img.height = 60;
    fg_img.total_width = 50;
    fg_img.color_mode = EPIC_COLOR_RGB565;
    fg_img.color_en = false;
    
    /* background image, its coordinate (0,0)~(99,99), buffer size is 100*100 */
    HAL_EPIC_BlendDataInit(&bg_img);
    bg_img.data = bg_img_buf;
    bg_img.x_offset = 0;
    bg_img.y_offset = 0;
    bg_img.width = 100;
    bg_img.height = 100;
    bg_img.total_width = 100;
    bg_img.color_mode = EPIC_COLOR_RGB565;
    bg_img.color_en = false;
    
    /* output image, its coordinate (0,0)~(99,99), share same buffer as background image */
    HAL_EPIC_BlendDataInit(&output_img);
    output_img.data = bg_img_buf;
    output_img.x_offset = 0;
    output_img.y_offset = 0;
    output_img.width = 100;
    output_img.height = 100;
    output_img.total_width = 100;
    output_img.color_mode = EPIC_COLOR_RGB565;
    output_img.color_en = false;
    
    epic_handle.XferCpltCallback = epic_cplt_callback;
    
    /* foreground image is rotated by 30 degree around its center */
    HAL_EPIC_RotDataInit(&trans_cfg);
    trans_cfg.angle = 300;
    trans_cfg.pivot_x = fg_img.width / 2;
    trans_cfg.pivot_y = fg_img.height / 2;
    trans_cfg.scale_x = 1000;
    trans_cfg.scale_y = 1000;    
    
    
    /* no scaling, opacity 100 
     * start EPIC in interrupt mode
     */
    ret = HAL_EPIC_Rotate_IT(&epic_handle, &trans_cfg, &fg_img, &bg_img, &output_img, 100);
    /* check ret value if any error happens */
    ...
    /* wait for completion */
    sema_take(epic_sema);
}

缩放示例

如图3所示，示例scale_down_img将位于(10,20)~(59,79)的前景图横向与纵向都缩小到原图的71%%，同时保持图中心点位置不变。类似旋转，也可以简单的将输出区域设成最大，如果输出buffer复用背景buffer，HAL将只更新缩小后区域（即[x0,y0]~[x1,y1]）所包含的像素的颜色值。

Figure 1: Scaling

/* scale down the foreground image by 1.4 and blend it with background using 100 opacity (0 is transparent, 255 is opaque)
 * output data is written back to background image buffer, it can also output to another buffer like blend_img_1.
 * 
 */
void scale_down_img(void)
{
    EPIC_BlendingDataType fg_img;
    EPIC_BlendingDataType bg_img;
    EPIC_BlendingDataType output_img;
    EPIC_TransformCfgTypeDef trans_cfg;
    HAL_StatusTypeDef ret;         
    
    /* foreground image, its coordinate (10,20)~(59,79) before scaling */
    HAL_EPIC_BlendDataInit(&fg_img);
    fg_img.data = fg_img_buf;
    fg_img.x_offset = 10;
    fg_img.y_offset = 20;
    fg_img.width = 50;
    fg_img.height = 60;
    fg_img.total_width = 50;
    fg_img.color_mode = EPIC_COLOR_RGB565;
    fg_img.color_en = false;
    
    /* background image, its coordinate (0,0)~(99,99) */
    HAL_EPIC_BlendDataInit(&bg_img);
    bg_img.data = bg_img_buf;
    bg_img.x_offset = 0;
    bg_img.y_offset = 0;
    bg_img.width = 100;
    bg_img.height = 100;
    bg_img.total_width = 100;
    bg_img.color_mode = EPIC_COLOR_RGB565;
    bg_img.color_en = false;
    
    /* output image, its coordinate (0,0)~(99,99), share same buffer as background image */
    HAL_EPIC_BlendDataInit(&output_img);
    output_img.data = bg_img_buf;
    output_img.x_offset = 0;
    output_img.y_offset = 0;
    output_img.width = 100;
    output_img.height = 100;
    output_img.total_width = 100;
    output_img.color_mode = EPIC_COLOR_RGB565;
    output_img.color_en = false;
    
    epic_handle.XferCpltCallback = epic_cplt_callback;

    /* no rotation, both X and Y direction are scaled down by 1.4, 
       the image center is in the same position after scaling */
    HAL_EPIC_RotDataInit(&trans_cfg);
    trans_cfg.pivot_x = fg_img.width / 2;
    trans_cfg.pivot_y = fg_img.height / 2;
    trans_cfg.scale_x = 1400;
    trans_cfg.scale_y = 1400;       
   
    /* opacity 100 
     * start EPIC in interrupt mode
     */
    ret = HAL_EPIC_Rotate_IT(&epic_handle, &trans_cfg, &fg_img, &bg_img, &output_img, 100);
    /* check ret value if any error happens */
    ...
    /* wait for completion */
    sema_take(epic_sema);
}

颜色填充示例

一个大小为100*90的buffer，在其(20,10)~(39, 49)区域填充颜色RGB(99,107,123)，配置的颜色值为RGB888格式，填充后的颜色格式为RGB565，硬件会作颜色格式转换。透明度为100，255表示不透明，0表示透明。因为填充的第一个像素位置为(20,10)，相对buffer的首地址有偏移，配置的起始地址应为偏移后的地址，total_width为buffer的总宽度，即100，width为填充区域的宽度，即(39-20+1)=20, 填充完一行20个像素的颜色后，会跳过余下的80个颜色，转到下一行继续填充，直到填完指定行数。

void fill_color(void)
{
    EPIC_FillingCfgTypeDef param;
    uint32_t start_offset;
    HAL_StatusTypeDef ret; 

    HAL_EPIC_FillDataInit(&param);
    /* topleft pixel offset in the output buffer */
    start_offset = 2 * (10 * 100 + 20);
    param.start = (uint8_t *)((uint32_t)output_buf + start_offset);
    /* filled color format RGB565 */
    param.color_mode = EPIC_COLOR_RGB565;
    /* filling area width */
    param.width = 20;
    /* filling area height */
    param.height = 40;
    /* filling buffer total width */
    param.total_width = 100;
    /* red part of RGB888 */
    param.color_r = 99;
    /* green part of RGB888 */
    param.color_g = 107;
    /* blue part of RGB888 */
    param.color_b = 123;
    /* opacity is 100 */
    param.alpha = 100;

    /* fill in polling mode */
    ret = HAL_EPIC_FillStart(&epic_handle, &param);
    /* check ret if any error happens */
}

API参考

bf0_hal_epic.h