diff options
Diffstat (limited to 'main/main.c')
| -rw-r--r-- | main/main.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/main/main.c b/main/main.c new file mode 100644 index 0000000..5ffcb6d --- /dev/null +++ b/main/main.c @@ -0,0 +1,128 @@ +#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" + +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++) { + cur_char_row = atascii_font[(uint8_t) character][row - row_start]; + for(int col = col_start; (col - col_start) < CHAR_WIDTH && col < NUM_COL; col++) { + pattern[row][col / 8] = (pattern[row][col / 8] & ~(0b0000000000000011 << (2 * (col - col_start)))); // clear this column (note the bitwise inversion) + if((1 << (col - col_start)) & cur_char_row) { + pattern[row][col / 8] = ((pattern[row][col / 8]) | color << (2 * (col - col_start))); // write color to column + } + } + } +} + +void app_main(void) +{ + 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=7, //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."); + + 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."); + + uint8_t current_row = 0; + while(true) { + spi_transaction_t t; + memset(&t, 0, sizeof(t)); + t.length = NUM_COL; + t.tx_buffer = pattern[current_row]; + 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; + } + + vTaskDelay((10) / portTICK_PERIOD_MS); + } +} |