[RVB2601 Creative Application Development] Experience Sharing 4: ADC Multi-channel Test + LVGL Display

wo4fisher

[RVB2601 Creative Application Development] Experience Sharing 4: ADC Multi-channel Test + LVGL Display [Copy link]

 

# Welcome to use the Markdown editor## Collection###1. [Flathead brother RVB2601 creative application development] Experience sharing 1: unboxing, environment construction, output helloworld](https://en.eeworld.com/bbs/thread-1197148-1-1.html) ###2. [Flathead brother RVB2601 creative application development] Experience sharing 2: multiple ways to light up, component learning](https://en.eeworld.com/bbs/thread-1197151-1-1.html) ###3. [[Flathead brother RVB2601 creative application development] Experience sharing 3: button control LED based on RTOS](https://en.eeworld.com/bbs/thread-1197189-1-1.html) ## 1. Use of ADC### 1.1 Hardware analysis mainly uses the ADC of 2601 to collect the AD values of the x and y directions of the joystick. Through chip and circuit analysis, PA5 (PA5_ADC_A3) and PA6 (PA6_ADC_A4) are used here, which are ADC_CH2 and ADC_CH3 of 2601 respectively. As shown in the figure below, disconnect the short-circuit caps of the original J1 (11-12) and J2 (5-6), and then connect J1-11 and J2_6 to the x and y signal outputs of the joystick respectively. <ignore_js_op> <img style="cursor:pointer;" id="aimg_597998" aid="597998" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202204/04/220111a5ekzes55sppe1nc.jpg" file="//bbs.eeworld.com.cn/data/attachment/forum/202204/04/220111a5ekzes55sppe1nc.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_597998_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>adc j1.jpg</strong> <em class="xg1">(74.06 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_597998" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=597998&handlekey=savephoto_597998">save to album</a> </p> <p class="xg1 y">2022-4-4 22:01 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <ignore_js_op> <img style="cursor:pointer;" id="aimg_597999" aid="597999" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202204/04/220112qoz5x5k9uuwsx5uo.jpg" file="//bbs.eeworld.com.cn/data/attachment/forum/202204/04/220112qoz5x5k9uuwsx5uo.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_597999_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>adc j2.jpg</strong> <em class="xg1">(69.79 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_597999" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=597999&handlekey=savephoto_597999">save to album</a> </p> <p class="xg1 y">2022-4-4 22:01 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ### 1.2 ADC initialization Here, the CSI2 interface is used. [ADC device doc document link address](https://yoc.docs.t-head.cn/yocbook/Chapter3-AliOS/CSI%E8%AE%BE%E5%A4%87%E9%A9%B1%E5%8A%A8%E6%8E%A5%E5%8F%A3/CSI2/ADC.html) The following functions are mainly used here: Function Description csi_adc_init ADC device initialization csi_adc_start Start ADC data conversion (synchronous) csi_adc_channel_enable Enable or disable an ADC channel csi_adc_channel_sampling_time Set channel sampling time csi_adc_sampling_time Set ADC sampling time csi_adc_freq_div Set ADC division coefficient The main code is as follows: ``` void myAdc_init(void) { int ret; /* GPIO init */ csi_pin_set_mux(EXAMPLE_ADC_CHANNEL3_PIN, EXAMPLE_ADC_CHANNEL3_PIN_FUNC); //Channel 3 pin multiplexing csi_pin_set_mux(EXAMPLE_ADC_CHANNEL2_PIN, EXAMPLE_ADC_CHANNEL2_PIN_FUNC); //Channel 2 pin multiplexing /* Initialize ADC peripheral */ ret = csi_adc_init(&adc, 0); // 0 is the default value of idx. if (ret != CSI_OK) LOGD(TAG, "adc init error .\n"); /* Configure frequency divsion, this value can be one of(4 8 16 32 64 128) */ ret = csi_adc_freq_div(&adc, 128); if (ret != CSI_OK) LOGD(TAG, "adc_freq_div = %d .\n", ret); /* Configure sampling time */ ret = csi_adc_sampling_time(&adc, 5); if (ret != CSI_OK) LOGD(TAG, "adc_sampling_time error .\n"); ret = csi_adc_channel_enable(&adc, EXAMPLE_ADC_CHANNEL3, true); //Enable channel 3 if (ret != CSI_ OK) LOGD(TAG, "channel3_enable error .\n"); ret = csi_adc_channel_enable(&adc, EXAMPLE_ADC_CHANNEL2, true); //Enable channel 2 if (ret != CSI_OK) LOGD(TAG, "channel2_enable error .\n"); } ``` ### 1.3 Read conversion results csi_adc_read The main code for reading ADC conversion results is as follows: ``` // Convert one channel at a time, starting from the enabled channels in sequence, and converting each channel one by one according to the channel number from small to large. // Here, the myAdc_get() function is called twice, which means that channel 2 and channel 3 can be converted. uint32_t myAdc_get(void) { int32_t ret; /* Trigger new conversion */ ret = csi_adc_start(&adc); if (ret != CSI_OK) LOGD(TAG, "adc_start error .\n"); /* Read result */ ret = csi_adc_read(&adc); return ret; } ``` ### 1.4 Task design in the main function``` static void application_adcTask_entry(void *arg) { uint32_t res_x = 0,res_y =0; //Save the conversion result myAdc_init(); //adc initialization while (1) { res_x = myAdc_get(); //Get channel 2 result res_y = myAdc_get(); //Get the result of channel 3; here the order is based on the enabled channels, and the channel numbers are converted one by one from small to large. Because two channels are enabled, LOGD(TAG, "adc = %d,%d\n", res_x,res_y); //Serial port prints the conversion result //Lock the mutex and transfer the result to adcRes[] for the lvgl task to call if (1 == aos_mutex_is_valid(&adc_mutex)) { aos_mutex_lock(&adc_mutex,AOS_WAIT_FOREVER); adcRes[0] = res_x; adcRes[1] = res_y; aos_mutex_unlock(&adc_mutex); } aos_msleep(1000); } aos_task_exit(0); } ``` <ignore_js_op> <img id="aimg_598004" style="cursor:pointer;" aid="598004" src="/bbs/static/image/common/none.gif" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202204/04/221906zno84eqae4yddyye.gif" file="//bbs.eeworld.com.cn/data/attachment/forum/202204/04/221906zno84eqae4yddyye.gif" class="zoom" onclick="zoom(this, this.src, 0, 0, 0)" width="700" id="aimg_598004" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_598004_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>adc2.gif</strong> <em class="xg1">(56.54 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_598004" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=598004&handlekey=savephoto_598004">save to album</a> </p> <p class="xg1 y">2022-4-4 22:19 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ## 2. Use lvgl label to display AD conversion value### 2.1 Porting of oled driver and lvgl gui library Here we use the files in ch2601_gui_demo, oeld.c and oled.h. <ignore_js_op> <img style="cursor:pointer;" id="aimg_598005" aid="598005" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202204/04/222413gyunegr7nyn7717j.jpg" file="//bbs.eeworld.com.cn/data/attachment/forum/202204/04/222413gyunegr7nyn7717j.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_598005_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>lvgl lbl.jpg</strong> <em class="xg1">(13.76 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_598005" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=598005&handlekey=savephoto_598005">save to album</a> </p> <p class="xg1 y">2022-4-4 22:24 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###2.2 The lvgl task design interface is as follows: <ignore_js_op> <img style="cursor:pointer;" id="aimg_598006" aid="598006" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202204/04/223048p2x1d58cvvqwwxdw.jpg" file="//bbs.eeworld.com.cn/data/attachment/forum/202204/04/223048p2x1d58cvvqwwxdw.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_598006_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>206d8665d07a5394ccdb9ab45f26ac5.jpg</strong> <em class="xg1">(178.88 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_598006" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=598006&handlekey=savephoto_598006">save to album</a> </p> <p class="xg1 y">2022-4-4 22:30 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> Global variable definition: --- ``` lv_obj_t *lbl_adc_x = NULL; lv_obj_t *lbl_adc_y = NULL; ``` Create label subfunction: --- ``` static void gui_label_create(void) { lv_obj_t *lbl_title = lv_label_create(lv_scr_act(), NULL); lv_label_set_long_mode(lbl_title, LV_LABEL_LONG_BREAK); lv_label_set_align(lbl_title, LV_LABEL_ALIGN_CENTER); lv_obj_set_pos(lbl_title, 0, 2); lv_obj_set_size(lbl_title, 128, 20); lv_label_set_text(lbl_title, "LVGL ADC DEMO"); lbl_adc_x = lv_label_create(lv_scr_act(), lbl_title); lv_obj_set_pos(lbl_adc_x, 0, 30); lv_obj_set_size(lbl_adc_x, 64, 20); lv_label_ set_text(lbl_adc_x, "X:0000"); lbl_adc_y = lv_label_create(lv_scr_act(), lbl_adc_x); lv_obj_set_pos(lbl_adc_y, 64, 30); lv_label_set_text(lbl_adc_y, "Y:0000"); } ```` lvgl task: --- ``` static void application_lvglTask_entry(void *arg) { lv_init(); /*Initialize for LittlevGL*/ oled_init(); /*Select display 1*/ gui_label_create(); while (1) { if (1 == aos_mutex_is_valid(&adc_mutex)) { aos_mutex_lock(&adc_mutex, AOS_WAIT_FOREVER); lv_ label_set_text_fmt(lbl_adc_x, "X:%d", adcRes[0]); lv_label_set_text_fmt(lbl_adc_y, "Y:%d", adcRes[1]); aos_mutex_unlock(&adc_mutex); } /* Periodically call the lv_task handler. * It could be done in a timer or an OS task interrupt too.*/ lv _task_handler(); aos_msleep(10); lv_tick_inc(1); } } ``` ## 3. Run results [attach] 598007 [/attach] ## 4. Summary 4.1 It is the most basic function, but I encountered many pitfalls. 4.1.1 At first, I used the HAL library of ADC, and the running result was incorrect. After a long time of struggling, I finally changed to the CSI solution, although the CSI interface was also used in HAL. I will try again later. 4.1.2 Whether it is the CSI interface or the HAL interface, the reason why I keep falling into the pit is that the official documents have almost no explanation and description of the key parameters. In addition, there are too many interface libraries, and there is no unified description of the use of these interfaces, so I spend a lot of time on the use and selection. 4.2 The use of continuous conversion mode and DMA mode of AD Whether continuous conversion can complete the conversion of two channels at a time needs to be verified later. If DMA is used, some filtering algorithms can be completed by multiple acquisitions. This is not sensitive to data, and I will test it when I have time.2); lv_obj_set_size(lbl_title, 128, 20); lv_label_set_text(lbl_title, "LVGL ADC DEMO"); lbl_adc_x = lv_label_create(lv_scr_act(), lbl_title); lv_obj_set_pos(lbl_adc_x, 0, 30); lv_obj_set_size(lbl_ adc_x, 64, 20 ; lvgl task: --- ``` static void application_lvglTask_entry(void *arg) { lv_init(); /*Initialize for LittlevGL*/ oled_init(); /*Select display 1*/ gui_label_create(); while (1) { if (1 == aos_mutex_is_valid(&adc_mutex)) { aos_mutex_lock(&adc_mutex, AOS_WAIT_FOREVER); lv_label_set_text_fmt(lbl_adc_x, "X:%d", adcRes[0]); lv_label_set_text_fmt(lbl_adc_y, "Y:%d", adcRes[1]) ; aos_mutex_unlock(&adc_mutex); } /* Periodically call the lv_task handler. * It could be done in a timer interrupt or an OS task too.*/ lv_task_handler(); aos_msleep(10); lv_tick_inc(1); } } ``` ## 3. Operation results [attach] 598007 [/attach] ## 4. Summary 4.1 is the most basic function, and I encountered a lot of Pitfalls. 4.1.1 At first, I used the HAL library of ADC, but the running result was incorrect. After a long time of struggling, I finally changed to the CSI solution, although the CSI interface was also used in HAL. I will try again later. 4.1 .2 Whether it is the CSI interface or the HAL interface, the reason why I keep falling into the pit is that the official documents have almost no explanation and description of the key parameters. In addition, there are too many interface libraries and no unified instructions for using these interfaces. It takes a lot of time to use and select. 4.2 AD continuous conversion mode and DMA mode usage Whether continuous conversion can complete the conversion of two channels at a time needs to be verified later. If DMA is used, multiple acquisitions can be completed to complete some filtering algorithms . This is not sensitive to data, and I will test it when I have time.2); lv_obj_set_size(lbl_title, 128, 20); lv_label_set_text(lbl_title, "LVGL ADC DEMO"); lbl_adc_x = lv_label_create(lv_scr_act(), lbl_title); lv_obj_set_pos(lbl_adc_x, 0, 30); lv_obj_set_size(lbl_ adc_x, 64, 20 ; lvgl task: --- ``` static void application_lvglTask_entry(void *arg) { lv_init(); /*Initialize for LittlevGL*/ oled_init(); /*Select display 1*/ gui_label_create(); while (1) { if (1 == aos_mutex_is_valid(&adc_mutex)) { aos_mutex_lock(&adc_mutex, AOS_WAIT_FOREVER); lv_label_set_text_fmt(lbl_adc_x, "X:%d", adcRes[0]); lv_label_set_text_fmt(lbl_adc_y, "Y:%d", adcRes[1]) ; aos_mutex_unlock(&adc_mutex); } /* Periodically call the lv_task handler. * It could be done in a timer interrupt or an OS task too.*/ lv_task_handler(); aos_msleep(10); lv_tick_inc(1); } } ``` ## 3. Operation results [attach] 598007 [/attach] ## 4. Summary 4.1 is the most basic function, and I encountered a lot of Pitfalls. 4.1.1 At first, I used the HAL library of ADC, but the running result was incorrect. After a long time of struggling, I finally changed to the CSI solution, although the CSI interface was also used in HAL. I will try again later. 4.1 .2 Whether it is the CSI interface or the HAL interface, the reason why I keep falling into the pit is that the official documents have almost no explanation and description of the key parameters. In addition, there are too many interface libraries and no unified instructions for using these interfaces. It takes a lot of time to use and select. 4.2 AD continuous conversion mode and DMA mode usage Whether continuous conversion can complete the conversion of two channels at a time needs to be verified later. If DMA is used, multiple acquisitions can be completed to complete some filtering algorithms . This is not sensitive to data, and I will test it when I have time.2 AD continuous conversion mode and DMA mode use whether continuous conversion can complete the conversion of two channels at a time, this needs to be verified later. If DMA is used, multiple acquisitions can be completed to complete some filtering algorithms. This is not sensitive to data, and will be tested when there is time.2 AD continuous conversion mode and DMA mode use whether continuous conversion can complete the conversion of two channels at a time, this needs to be verified later. If DMA is used, multiple acquisitions can be completed to complete some filtering algorithms. This is not sensitive to data, and will be tested when there is time.

wangerxian

I also want to be able to display the waveform, that would be even more powerful~

wo4fisher

wangerxian posted on 2022-4-6 15:56 I also want to be able to display the waveform, that would be even more powerful~

Using the chart component?

wangerxian

wo4fisher posted on 2022-4-7 00:08 Use the chart component?

Sure. Just give it a try.