#393 Add NULL waveform + first test

examples/vcom-kickback/main/main.c

@@ -21,33 +21,30 @@ int temperature = 25;
 EpdRect dragon_area = { .x = 0, .y = 0, .width = dragon_width, .height = dragon_height };
 
 void idf_loop() {
-    epd_fullclear(&hl, temperature);
-    epd_copy_to_framebuffer(dragon_area, dragon_data, epd_hl_get_framebuffer(&hl));
-    // Supposedly to measure VCOM the display needs to update
-    // all the time with a NULL waveform (That we don't know how it is)
-    // MODE_GC16 or MODE_DU ?
+    //vTaskDelay(pdMS_TO_TICKS(1));
     //epd_fill_rect(epd_full_screen(), 0, epd_hl_get_framebuffer(&hl));
     epd_hl_update_screen(&hl, MODE_DU, temperature);
-
-    tps_vcom_kickback_rdy();
-    vTaskDelay(20);
-    /*
-    epd_fill_rect(epd_full_screen(), 255, epd_hl_get_framebuffer(&hl));
-    epd_hl_update_screen(&hl, MODE_GC16, temperature);
-    vTaskDelay(100); */
 }
 
 void idf_setup() {
     epd_init(&DEMO_BOARD, &ED097TC2, EPD_LUT_64K);
-    hl = epd_hl_init(EPD_BUILTIN_WAVEFORM);
-
-
+    hl = epd_hl_init(&epdiy_NULL);
     tps_vcom_kickback();
-    tps_vcom_kickback_start();
 
-    while ( 1 ) {
-      idf_loop();
+    for (int a = 5; a>0; a--) {
+        idf_loop();
     }
+    tps_vcom_kickback_start();
+
+    int isrdy = 1;
+    int kickback_volt = 0;
+    while (kickback_volt == 0) {
+    idf_loop();
+    isrdy++;
+    kickback_volt = tps_vcom_kickback_rdy();
+    }
+    printf("VCOM reading of %d mV. was ready in %d refreshes\n", kickback_volt, isrdy);
+
 }
 
 #ifndef ARDUINO_ARCH_ESP32

src/board/epd_board_v7.c

@@ -273,8 +273,7 @@ static void epd_board_measure_vcom(epd_ctrl_state_t* state) {
     while (!(pca9555_read_input(config_reg.port, 1) & CFG_PIN_PWRGOOD)) {
     }
     ESP_LOGI("epdiy", "Power rails enabled");
-    // Replace for vcom kick-back: We will not set VCOM in this mode
-    //tps_set_vcom(config_reg.port, vcom);
+
     state->ep_sth = true;
     mask = (const epd_ctrl_state_t){
         .ep_sth = true,

src/board/tps65185.c

@@ -102,34 +102,43 @@ void tps_vcom_kickback() {
     printf("VCOM Kickback test\n");
     // Pull the WAKEUP pin and the PWRUP pin high to enable all output rails.
     // But do not set VCOM to any voltage!
-    epd_current_board()->measure_vcom(epd_ctrl_state());
-
-    //  Set the HiZ bit in the VCOM2 register (BIT 5) 0x20
+     epd_current_board()->measure_vcom(epd_ctrl_state());
+    // Set the HiZ bit in the VCOM2 register (BIT 5) 0x20
     // This puts the VCOM pin in a high-impedance state.
-    tps_write_register(I2C_NUM_0, 4, 0x20); 
-}
+    // PLUS
+    // BIT 3 & 4 Number of acquisitions that is averaged to a single kick-back V. measurement
+    tps_write_register(I2C_NUM_0, 4, 0x38);
+    vTaskDelay(1);
+
+    uint8_t int1reg = tps_read_register(I2C_NUM_0, TPS_REG_INT1);
+    uint8_t vcomreg = tps_read_register(I2C_NUM_0, TPS_REG_VCOM2);
+    printf("kickback INT1: %x VCOM: %x\n\n", int1reg, vcomreg);
+
+    }
 
 /**
  * @brief Start measurements 
  */
 void tps_vcom_kickback_start() {
+    uint8_t int1reg = tps_read_register(I2C_NUM_0, TPS_REG_INT1);
+    printf("kickstart INT1: %x\n\n", int1reg);
     // Set the ACQ bit in the VCOM2 register to 1 (BIT 7)
-    tps_write_register(I2C_NUM_0, 4, 0x80);
+    tps_write_register(I2C_NUM_0, TPS_REG_VCOM2, 0xA0); // BIT 5 + 7
 }
 
 /**
  * @brief ACQC (Acquisition Complete) bit in the INT1 register is set
- * //lbs &= 0xFF;mbs &= 0x100 >> 8;
  * @return mV 0 is not read! 
  */
 unsigned tps_vcom_kickback_rdy() {
-    // ACQC (Acquisition Complete) bit in the INT1 register is set?
-    if (tps_read_register(I2C_NUM_0, TPS_REG_INT1) == 0x02) {
+    uint8_t int1reg = tps_read_register(I2C_NUM_0, TPS_REG_INT1);
+
+    if (int1reg == 0x02) {
         uint8_t lsb = tps_read_register(I2C_NUM_0, 3);
         uint8_t msb = tps_read_register(I2C_NUM_0, 4);
         int u16Value = (lsb | (msb << 8)) & 0x1ff;
         printf("Kickback lsb:%d msb:%d result:%d\n\n", lsb, msb, u16Value);
-        return u16Value;
+        return u16Value *10;
     } else {
         return 0;
     }

src/builtin_waveforms.c

@@ -12,3 +12,4 @@
 #include "waveforms/epdiy_ED097OC4.h"
 #include "waveforms/epdiy_ED097TC2.h"
 #include "waveforms/epdiy_ED133UT2.h"
+#include "waveforms/epdiy_NULL.h"

src/epd_internals.h

@@ -54,6 +54,7 @@ extern const EpdWaveform epdiy_ED097TC2;
 extern const EpdWaveform epdiy_ED060XC3;
 extern const EpdWaveform epdiy_ED060SCT;
 extern const EpdWaveform epdiy_ED133UT2;
+extern const EpdWaveform epdiy_NULL;
 
 /// Font data stored PER GLYPH
 typedef struct {