100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
#include <stdio.h>
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#include "driver/i2c_master.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#define I2C_SCL 1 /*FIXME*/
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#define I2C_SDA 2
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/* Docs: https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf */
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#define DISP_ADDRESS 0X3c
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#define I2C_FREQ 100000
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static i2c_master_dev_handle_t disp_handle;
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void init_i2c(void){
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i2c_master_bus_config_t i2c_mst_config = {
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.clk_source = I2C_CLK_SRC_DEFAULT,
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.i2c_port = I2C_PORT_NUM_0,
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.scl_io_num = I2C_SCL,
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.sda_io_num = I2C_SDA,
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.glitch_ignore_cnt = 7,
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.flags.enable_internal_pullup = true,
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};
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i2c_master_bus_handle_t bus_handle;
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ESP_ERROR_CHECK(i2c_new_master_bus(&i2c_mst_config, &bus_handle));
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i2c_device_config_t dev_cfg = {
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.dev_addr_length = I2C_ADDR_BIT_LEN_7,
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.device_address = DISP_ADDRESS,
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.scl_speed_hz = I2C_FREQ,
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};
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ESP_ERROR_CHECK(i2c_master_bus_add_device(bus_handle, &dev_cfg, &disp_handle));
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}
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void i2c_disp_send_cmd(uint8_t cmd){
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uint8_t data[2] = {0x00, cmd}; /*command mode*/
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ESP_ERROR_CHECK(
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i2c_master_transmit(disp_handle, data, sizeof(data), pdMS_TO_TICKS(100))
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);
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}
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void i2c_disp_send_data(uint8_t *data, size_t len){
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uint8_t *buf = malloc(len + 1);
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buf[0] = 0x40; /*data mode*/
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memcpy(&buf[1], data, len);
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ESP_ERROR_CHECK(
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i2c_master_transmit(disp_handle, buf, len + 1, pdMS_TO_TICKS(100)));
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free(buf);
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}
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void init_display(void){
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/*according to https://gist.github.com/pulsar256/564fda3b9e8fc6b06b89*/
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i2c_disp_send_cmd(0xAE); // Set display OFF
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i2c_disp_send_cmd(0xD4); // Set Display Clock Divide Ratio / OSC Frequency
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i2c_disp_send_cmd(0x80); // Display Clock Divide Ratio / OSC Frequency
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i2c_disp_send_cmd(0xA8); // Set Multiplex Ratio
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i2c_disp_send_cmd(0x3F); // Multiplex Ratio for 128x64 (64-1)
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i2c_disp_send_cmd(0xD3); // Set Display Offset
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i2c_disp_send_cmd(0x00); // Display Offset
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i2c_disp_send_cmd(0x40); // Set Display Start Line
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i2c_disp_send_cmd(0x8D); // Set Charge Pump
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i2c_disp_send_cmd(0x14); // Charge Pump (0x10 External, 0x14 Internal DC/DC)
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i2c_disp_send_cmd(0xA1); // Set Segment Re-Map
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i2c_disp_send_cmd(0xC8); // Set Com Output Scan Direction
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i2c_disp_send_cmd(0xDA); // Set COM Hardware Configuration
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i2c_disp_send_cmd(0x12); // COM Hardware Configuration
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i2c_disp_send_cmd(0x81); // Set Contrast
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i2c_disp_send_cmd(0xCF); // Contrast
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i2c_disp_send_cmd(0xD9); // Set Pre-Charge Period
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i2c_disp_send_cmd(0xF1); // Set Pre-Charge Period (0x22 External, 0xF1 Internal)
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i2c_disp_send_cmd(0xDB); // Set VCOMH Deselect Level
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i2c_disp_send_cmd(0x40); // VCOMH Deselect Level
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i2c_disp_send_cmd(0xA4); // Set all pixels OFF
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i2c_disp_send_cmd(0xA6); // Set display not inverted
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i2c_disp_send_cmd(0xAF); // Set display On
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}
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void app_main(void){
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init_i2c();
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init_display();
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} |