Moving display update to its own task. Fancier demo.

1 files changed, 31 insertions, 21 deletions

diff --git a/main/main.c b/main/main.c
index b5f7362..f2822a8 100644
--- a/main/main.c
+++ b/main/main.c
@@ -27,10 +27,12 @@
 #define PIN_NUM_R_ADDR_1     18
 #define PIN_NUM_R_ADDR_2     19
 
-#define TAG           "led_display"
+#define TAG                  "led_display"
+#define STACK_SIZE           2000
 
 static uint16_t pattern[NUM_ROW][NUM_COL / 8]; // each column is two bits, so 8 can fit in 16-bit integer
 
+
 void draw_char_at_position(char character, uint16_t col_start, uint16_t row_start, uint16_t color) {
     uint8_t cur_char_row;
     for(int row = row_start; (row - row_start) < CHAR_HEIGHT && row < NUM_ROW; row++) {
@@ -44,7 +46,8 @@ void draw_char_at_position(char character, uint16_t col_start, uint16_t row_star
     }
 }
 
-void app_main(void)
+
+void updateDisplay(void* params)
 {
     esp_err_t ret;
     spi_device_handle_t spi;
@@ -83,29 +86,10 @@ void app_main(void)
 
     ESP_LOGI(TAG, "Setup GPIO.");
 
-    char* text = "Hello World!! 1234567890";
-    for(int i = 0; i < strlen(text); i++) {
-        draw_char_at_position(text[i], i * CHAR_WIDTH, 0, RED);
-    }
-
-    ESP_LOG_BUFFER_HEX(TAG, pattern[0], 16);
-    ESP_LOG_BUFFER_HEX(TAG, pattern[1], 16);
-    ESP_LOG_BUFFER_HEX(TAG, pattern[2], 16);
-    ESP_LOG_BUFFER_HEX(TAG, pattern[3], 16);
-    ESP_LOG_BUFFER_HEX(TAG, pattern[4], 16);
-    ESP_LOG_BUFFER_HEX(TAG, pattern[5], 16);
-    ESP_LOG_BUFFER_HEX(TAG, pattern[6], 16);
-    ESP_LOG_BUFFER_HEX(TAG, pattern[7], 16);
-
-    ESP_LOGI(TAG, "Done drawing pattern.");
-    ESP_LOGI(TAG, "Ticks per MS: %i", (int) portTICK_PERIOD_MS);
-
     TickType_t xLastWakeTime;
     const TickType_t xFrequency = 1 / portTICK_PERIOD_MS;
     xLastWakeTime = xTaskGetTickCount();
 
-    ESP_LOGI(TAG, "Ticks between updates: %i", (int) xFrequency);
-
     uint8_t current_row = 0;
     uint16_t refresh_count = 0;
     TickType_t startMillis = xTaskGetTickCount();
@@ -148,3 +132,29 @@ void app_main(void)
         }
     }
 }
+
+
+void app_main(void)
+{
+    TaskHandle_t taskHandle;
+    xTaskCreate(updateDisplay, "updateDisplay", STACK_SIZE, NULL, tskIDLE_PRIORITY, &taskHandle);
+
+    int j = 0;
+    while(true) {
+        ESP_LOGI(TAG, "Writing words...");
+
+        char* hello = "Hello World!!";
+        for(int i = 0; i < strlen(hello); i++) {
+            draw_char_at_position(hello[i], i * CHAR_WIDTH, 0, j % 2 + 1);
+        }
+
+        char* numbers = "0123456789";
+        int offset = strlen(hello) + 1;
+        for(int i = 0; i < strlen(numbers); i++) {
+            draw_char_at_position(numbers[i], (i + offset) * CHAR_WIDTH, 0, j % 2 + 2);
+        }
+
+        j++;
+        vTaskDelay(5000 / portTICK_PERIOD_MS);
+    }
+}