esp32 firmware for a toaster reflow oven WIP!!!!!
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
reflower/main/graphics/nokia.c

179 lines
6.2 KiB

5 years ago
#include <driver/gpio.h>
#include <driver/spi_master.h>
5 years ago
#include "nokia.h"
5 years ago
#include <string.h>
5 years ago
/* Pin definitions:
Most of these pins can be moved to any digital or analog pin.
DN(MOSI)and SCLK should be left where they are (SPI pins). The
LED (backlight) pin should remain on a PWM-capable pin. */
5 years ago
static const int scePin = 17; // SCE - Chip select, pin 3 on LCD.
static const int rstPin = 16; // RST - Reset, pin 4 on LCD.
static const int dcPin = 4; // DC - Data/Command, pin 5 on LCD.
static const int sdinPin = 15; // DN(MOSI) - Serial data, pin 6 on LCD.
5 years ago
static const int sclkPin = 13; // SCLK - Serial clock, pin 7 on LCD.
/* PCD8544-specific defines: */
#define LCD_COMMAND 0
#define LCD_DATA 1
5 years ago
#define DEFAULT_CONTRAST 48
5 years ago
static spi_device_handle_t hSPI;
5 years ago
/* The displayMap variable stores a buffer representation of the
pixels on our display. There are 504 total bits in this array,
same as how many pixels there are on a 84 x 48 display.
Each byte in this array covers a 8-pixel vertical block on the
display. Each successive byte covers the next 8-pixel column over
until you reach the right-edge of the display and step down 8 rows.
To update the display, we first have to write to this array, then
call the updateDisplay() function, which sends this whole array
to the PCD8544.
Because the PCD8544 won't let us write individual pixels at a
time, this is how we can make targeted changes to the display. */
uint8_t LCD_displayMap[LCD_WIDTH * LCD_HEIGHT / 8] = {};
5 years ago
// There are two memory banks in the LCD, data/RAM and commands.
// This function sets the DC pin high or low depending, and then
// sends the data byte
5 years ago
static void LCD_SendBytes(bool data_or_command, const uint8_t *data, size_t len)
5 years ago
{
5 years ago
esp_err_t ret;
spi_transaction_t t;
if (len == 0) return; //no need to send anything
memset(&t, 0, sizeof(t)); //Zero out the transaction
t.length = len * 8; //Len is in bytes, transaction length is in bits.
t.tx_buffer = data; //Data
t.user = (void *) data_or_command; //D/C
ret = spi_device_polling_transmit(hSPI, &t); //Transmit!
assert(ret == ESP_OK); //Should have had no issues.
}
5 years ago
5 years ago
// There are two memory banks in the LCD, data/RAM and commands.
// This function sets the DC pin high or low depending, and then
// sends the data byte
static void LCD_SendByte(bool data_or_command, uint8_t data)
{
esp_err_t ret;
spi_transaction_t t;
memset(&t, 0, sizeof(t)); //Zero out the transaction
t.length = 8; // transaction length is in bits.
t.tx_data[0] = data; //Data
t.flags = SPI_TRANS_USE_TXDATA;
t.user = (void *) data_or_command; //D/C
ret = spi_device_polling_transmit(hSPI, &t); //Transmit!
assert(ret == ESP_OK); //Should have had no issues.
5 years ago
}
// Helpful function to directly command the LCD to go to a
// specific x,y coordinate.
static void gotoXY(int x, int y)
{
const uint8_t cmd[2] = {
0x80 | x,
0x40 | y,
};
LCD_SendBytes(LCD_COMMAND, cmd, 2);
5 years ago
}
// This will actually draw on the display, whatever is currently
// in the displayMap array.
void LCD_updateDisplay()
{
5 years ago
spi_device_acquire_bus(hSPI, portMAX_DELAY);
gotoXY(0, 0);
LCD_SendBytes(LCD_DATA, &LCD_displayMap[0], LCD_WIDTH * (LCD_HEIGHT / 8));
5 years ago
spi_device_release_bus(hSPI);
5 years ago
}
// Set contrast can set the LCD Vop to a value between 0 and 127.
// 40-60 is usually a pretty good range.
void LCD_setContrast(uint8_t contrast)
{
5 years ago
spi_device_acquire_bus(hSPI, portMAX_DELAY);
const uint8_t cmd[3] = {
0x21, //Tell LCD that extended commands follow
0x80 | contrast,//Set LCD Vop (Contrast): Try 0xB1(good @ 3.3V) or 0xBF if your display is too dark
0x20,//Set display mode
};
LCD_SendBytes(LCD_COMMAND, cmd, 3);
5 years ago
spi_device_release_bus(hSPI);
5 years ago
}
void LCD_invertDisplay(bool invert)
5 years ago
{
LCD_SendByte(LCD_COMMAND, 0x0C | invert);
}
5 years ago
//This function is called (in irq context!) just before a transmission starts. It will
//set the D/C line to the value indicated in the user field.
void lcd_spi_pre_transfer_callback(spi_transaction_t *t)
{
int dc = (int) t->user;
gpio_set_level(dcPin, dc);
5 years ago
}
//This sends the magical commands to the PCD8544
void LCD_setup(void)
{
5 years ago
gpio_config_t output = {
.pin_bit_mask = (1 << scePin) | (1 << rstPin) | (1 << dcPin) | (1 << sdinPin) | (1 << sclkPin),
5 years ago
.mode = GPIO_MODE_OUTPUT
};
gpio_config(&output);
esp_err_t ret;
spi_bus_config_t buscfg = {
.miso_io_num=-1,
.mosi_io_num=sdinPin,
.sclk_io_num=sclkPin,
.quadwp_io_num=-1,
.quadhd_io_num=-1,
.max_transfer_sz=LCD_WIDTH * LCD_HEIGHT, // ??? this doesnt seem to do anything in the driver
};
spi_device_interface_config_t devcfg = {
.clock_speed_hz=4 * 1000 * 1000, // Hz
5 years ago
// enable signal lead/lag
.cs_ena_pretrans = 0,
.cs_ena_posttrans = 0,
.mode=0, //SPI mode 0
.spics_io_num=scePin, //CS pin
.queue_size=1, // we use the polling mode, so this does not matter
.pre_cb=lcd_spi_pre_transfer_callback, //Specify pre-transfer callback to handle D/C line
};
//Initialize the SPI bus
ret = spi_bus_initialize(HSPI_HOST, &buscfg, 1);
ESP_ERROR_CHECK(ret);
//Attach the LCD to the SPI bus
ret = spi_bus_add_device(HSPI_HOST, &devcfg, &hSPI);
ESP_ERROR_CHECK(ret);
spi_device_acquire_bus(hSPI, portMAX_DELAY);
5 years ago
{
//Reset the LCD to a known state
gpio_set_level(rstPin, 0);
gpio_set_level(rstPin, 1);
const uint8_t magic[6] = {
0x21, // Tell LCD extended commands follow
0x80 + DEFAULT_CONTRAST, // Set LCD Vop (Contrast)
0x04, // Set Temp coefficent
0x14, // LCD bias mode 1:48 (try 0x13)
//We must send 0x20 before modifying the display control mode
0x20, // Clear extended option
0x0C, // Set display control, normal mode.
};
LCD_SendBytes(LCD_COMMAND, &magic[0], 6);
}
5 years ago
spi_device_release_bus(hSPI);
5 years ago
// show the blank screen (display is in an undefined state after boot)
5 years ago
LCD_updateDisplay();
5 years ago
}