diff options
Diffstat (limited to 'main/main.c')
| -rw-r--r-- | main/main.c | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/main/main.c b/main/main.c deleted file mode 100644 index 34ac38e..0000000 --- a/main/main.c +++ /dev/null @@ -1,170 +0,0 @@ -#include <stdio.h> -#include <string.h> - -#include "driver/spi_master.h" -#include "driver/gpio.h" -#include "freertos/FreeRTOS.h" -#include "freertos/task.h" -#include "atascii.h" -#include "esp_log.h" - - -#define NUM_COL 160 -#define NUM_ROW 8 -#define CHAR_HEIGHT 8 -#define CHAR_WIDTH 8 -#define RED 1 -#define GREEN 2 -#define ORANGE 3 - -#define PIN_NUM_MISO 12 -#define PIN_NUM_MOSI 13 -#define PIN_NUM_CLK 14 -#define PIN_NUM_CS 15 -#define PIN_NUM_R_LATCH 16 -#define PIN_NUM_R_CLK 17 -#define PIN_NUM_R_ADDR_0 5 -#define PIN_NUM_R_ADDR_1 18 -#define PIN_NUM_R_ADDR_2 19 - -#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 setPixel(uint16_t x, uint16_t y, uint16_t color) { - pattern[y][x / 8] = pattern[y][x / 8] & ~(0b0000000000000011 << (14 - (2 * (x % 8)))); // clear this column (note the bitwise inversion) - pattern[y][x / 8] = pattern[y][x / 8] | (color << (14 - (2 * (x % 8)))); // write color to column -} - - -void drawCharAtPosition(char character, int x_start, int y_start, uint16_t color) { - uint8_t cur_char_row; - for(int y = y_start; (y - y_start) < CHAR_HEIGHT && y < NUM_ROW; y++) { - cur_char_row = atascii_font[(uint8_t) character][y - y_start]; - for(int x = x_start; (x - x_start) < CHAR_WIDTH && x < NUM_COL; x++) { - if(x >= 0) { - if((0b10000000 >> (x - x_start)) & cur_char_row) { - setPixel(x, y, color); - } - else { - setPixel(x, y, 0); - } - } - } - } -} - - -void updateDisplay(void* params) -{ - esp_err_t ret; - spi_device_handle_t spi; - - spi_bus_config_t buscfg={ - .miso_io_num=PIN_NUM_MISO, - .mosi_io_num=PIN_NUM_MOSI, - .sclk_io_num=PIN_NUM_CLK, - .quadwp_io_num=-1, - .quadhd_io_num=-1, - .max_transfer_sz=3*600*2*8, - .flags=SPICOMMON_BUSFLAG_DUAL - }; - - spi_device_interface_config_t devcfg={ - .clock_speed_hz=1*1000*1000, //Clock out at 1 MHz - .mode=0, //SPI mode 0 - .spics_io_num=PIN_NUM_CS, //CS pin - .queue_size=1, //We want to be able to queue 7 transactions at a time - .flags=SPI_DEVICE_HALFDUPLEX, //Needed to use both data lines for output - }; - - //Initialize the SPI bus and attach our device handle - ret=spi_bus_initialize(HSPI_HOST, &buscfg, SPI_DMA_CH_AUTO); - ESP_ERROR_CHECK(ret); - ret=spi_bus_add_device(HSPI_HOST, &devcfg, &spi); - ESP_ERROR_CHECK(ret); - - ESP_LOGI(TAG, "Initialized SPI host."); - - gpio_set_direction(PIN_NUM_R_LATCH, GPIO_MODE_OUTPUT); - gpio_set_direction(PIN_NUM_R_CLK, GPIO_MODE_OUTPUT); - gpio_set_direction(PIN_NUM_R_ADDR_0, GPIO_MODE_OUTPUT); - gpio_set_direction(PIN_NUM_R_ADDR_1, GPIO_MODE_OUTPUT); - gpio_set_direction(PIN_NUM_R_ADDR_2, GPIO_MODE_OUTPUT); - - ESP_LOGI(TAG, "Setup GPIO."); - - TickType_t xLastWakeTime; - const TickType_t xFrequency = 1 / portTICK_PERIOD_MS; - xLastWakeTime = xTaskGetTickCount(); - - uint8_t current_row = 0; - uint16_t refresh_count = 0; - TickType_t startMillis = xTaskGetTickCount(); - TickType_t endMillis; - uint8_t i = 0; - uint16_t data; - while(true) { - vTaskDelayUntil(&xLastWakeTime, xFrequency); - - for(i = 0; i < (NUM_COL / 8); i++) { - spi_transaction_t t; - memset(&t, 0, sizeof(t)); - t.length = 16; - data = SPI_SWAP_DATA_TX(pattern[current_row][i], 16); - t.tx_buffer = &data; - t.flags = SPI_TRANS_MODE_DIO; // output on two data lines. Even bits go to GREEN, odd to RED - ret = spi_device_polling_transmit(spi, &t); - ESP_ERROR_CHECK(ret); - } - - gpio_set_level(PIN_NUM_R_LATCH, 0); - gpio_set_level(PIN_NUM_R_CLK, 1); - - gpio_set_level(PIN_NUM_R_ADDR_0, 1 & current_row); - gpio_set_level(PIN_NUM_R_ADDR_1, 1 & (current_row >> 1)); - gpio_set_level(PIN_NUM_R_ADDR_2, 1 & (current_row >> 2)); - - gpio_set_level(PIN_NUM_R_LATCH, 1); - gpio_set_level(PIN_NUM_R_CLK, 0); - - if(++current_row == NUM_ROW) { - current_row = 0; - - if(++refresh_count == 1000) { - endMillis = xTaskGetTickCount(); - ESP_LOGI(TAG, "Refresh Rate: %f Hz", (float) refresh_count * 1000 / (endMillis - startMillis)); - refresh_count = 0; - startMillis = xTaskGetTickCount(); - } - } - } -} - - -void app_main(void) -{ - TaskHandle_t taskHandle; - xTaskCreate(updateDisplay, "updateDisplay", STACK_SIZE, NULL, tskIDLE_PRIORITY, &taskHandle); - - int j = NUM_COL; - int color = 1; - char* hello = "Hello World!! 0123456789"; - int hello_length = strlen(hello); - int min_x = hello_length * -CHAR_WIDTH; - while(true) { - for(int i = 0; i < strlen(hello); i++) { - drawCharAtPosition(hello[i], j + (i * CHAR_WIDTH), 0, color); - } - - if(--j == min_x) { - j = NUM_COL; - if(++color > 3) { - color = 1; - } - } - vTaskDelay(50 / portTICK_PERIOD_MS); - } -} |