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This commit is contained in:
Martin Brodbeck 2022-05-31 09:47:43 +02:00
parent 275e012695
commit 440359d775
2 changed files with 43 additions and 76 deletions
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104
lcd.cpp
View file

@ -29,23 +29,22 @@ constexpr int LCD_ENABLE_BIT = 0x04;
LCD::LCD(i2c_inst_t *i2c, const uint gpio_sda, const uint gpio_scl, LCD::LCD(i2c_inst_t *i2c, const uint gpio_sda, const uint gpio_scl,
const uint8_t i2c_addr, uint8_t num_cols, uint8_t num_lines) const uint8_t i2c_addr, uint8_t num_cols, uint8_t num_lines)
: i2c{i2c}, i2c_addr{i2c_addr}, num_cols{num_cols}, num_lines{num_lines} : i2c{i2c}, i2c_addr{i2c_addr}, num_cols{num_cols}, num_lines{num_lines} {
{ i2c_init(i2c1, 100 * 1000);
i2c_init(i2c1, 100 * 1000); gpio_set_function(gpio_sda, GPIO_FUNC_I2C);
gpio_set_function(gpio_sda, GPIO_FUNC_I2C); gpio_set_function(gpio_scl, GPIO_FUNC_I2C);
gpio_set_function(gpio_scl, GPIO_FUNC_I2C); gpio_pull_up(gpio_sda);
gpio_pull_up(gpio_sda); gpio_pull_up(gpio_scl);
gpio_pull_up(gpio_scl);
sendByte(0x03, Mode::COMMAND); sendByte(0x03, Mode::COMMAND);
sendByte(0x03, Mode::COMMAND); sendByte(0x03, Mode::COMMAND);
sendByte(0x03, Mode::COMMAND); sendByte(0x03, Mode::COMMAND);
sendByte(0x02, Mode::COMMAND); sendByte(0x02, Mode::COMMAND);
sendByte(LCD_ENTRYMODESET | LCD_ENTRYLEFT, Mode::COMMAND); sendByte(LCD_ENTRYMODESET | LCD_ENTRYLEFT, Mode::COMMAND);
sendByte(LCD_FUNCTIONSET | LCD_2LINE, Mode::COMMAND); sendByte(LCD_FUNCTIONSET | LCD_2LINE, Mode::COMMAND);
sendByte(LCD_DISPLAYCONTROL | LCD_DISPLAYON, Mode::COMMAND); sendByte(LCD_DISPLAYCONTROL | LCD_DISPLAYON, Mode::COMMAND);
clear(); clear();
} }
// go to location on LCD // go to location on LCD
@ -54,65 +53,38 @@ void LCD::setCursor(int line, int position) {
sendByte(val, Mode::COMMAND); sendByte(val, Mode::COMMAND);
} }
void LCD::sendChar(char val) { void LCD::sendChar(char val) { sendByte(val, Mode::CHARACTER); }
sendByte(val, Mode::CHARACTER);
}
void LCD::sendString(const std::string &str) { void LCD::sendString(const std::string &str) {
for (const char &c : str) { for (const char &c : str) {
sendChar(c); sendChar(c);
} }
} }
void LCD::clear() { void LCD::clear() { sendByte(LCD_CLEARDISPLAY, Mode::COMMAND); }
sendByte(LCD_CLEARDISPLAY, Mode::COMMAND);
void LCD::i2cWriteByte(uint8_t val) {
i2c_write_blocking(i2c, i2c_addr, &val, 1, false);
} }
void LCD::i2cWriteByte(uint8_t val) void LCD::toggleEnable(uint8_t val) {
{ // Toggle enable pin on LCD display
i2c_write_blocking(i2c, i2c_addr, &val, 1, false); // We cannot do this too quickly or things don't work
} constexpr uint64_t DELAY_US = 600;
sleep_us(DELAY_US);
void LCD::toggleEnable(uint8_t val) i2cWriteByte(val | LCD_ENABLE_BIT);
{ sleep_us(DELAY_US);
// Toggle enable pin on LCD display i2cWriteByte(val & ~LCD_ENABLE_BIT);
// We cannot do this too quickly or things don't work sleep_us(DELAY_US);
constexpr uint64_t DELAY_US = 600;
sleep_us(DELAY_US);
i2cWriteByte(val | LCD_ENABLE_BIT);
sleep_us(DELAY_US);
i2cWriteByte(val & ~LCD_ENABLE_BIT);
sleep_us(DELAY_US);
} }
// The display is sent a byte as two separate nibble transfers // The display is sent a byte as two separate nibble transfers
void LCD::sendByte(uint8_t val, Mode mode) void LCD::sendByte(uint8_t val, Mode mode) {
{ uint8_t high = static_cast<int>(mode) | (val & 0xF0) | LCD_BACKLIGHT;
uint8_t high = static_cast<int>(mode) | (val & 0xF0) | LCD_BACKLIGHT; uint8_t low = static_cast<int>(mode) | ((val << 4) & 0xF0) | LCD_BACKLIGHT;
uint8_t low = static_cast<int>(mode) | ((val << 4) & 0xF0) | LCD_BACKLIGHT;
i2cWriteByte(high); i2cWriteByte(high);
toggleEnable(high); toggleEnable(high);
i2cWriteByte(low); i2cWriteByte(low);
toggleEnable(low); toggleEnable(low);
} }
int LCD::backlight_off()
{
uint8_t data = 0;
int ret{0};
ret = i2c_write_blocking(i2c1, i2c_addr, &data, 1, false);
return ret;
}
int LCD::backlight_on()
{
int ret{0};
/*uint8_t data = 1 << SHIFT_BACKLIGHT;
ret = i2c_write_blocking(i2c1, i2c_addr, &data, 1, false);*/
return ret;
}

15
lcd.h
View file

@ -6,19 +6,14 @@
#include "hardware/i2c.h" #include "hardware/i2c.h"
#include "pico/stdlib.h" #include "pico/stdlib.h"
enum class Mode enum class Mode { COMMAND, CHARACTER };
{
COMMAND,
CHARACTER
};
class LCD class LCD {
{
public: public:
LCD(i2c_inst_t *i2c, const uint gpio_sda, const uint gpio_scl, LCD(i2c_inst_t *i2c, const uint gpio_sda, const uint gpio_scl,
const uint8_t i2c_addr = 0x27, uint8_t num_cols = 16, uint8_t num_lines = 2); const uint8_t i2c_addr = 0x27, uint8_t num_cols = 16,
int backlight_off(); uint8_t num_lines = 2);
int backlight_on();
void sendString(const std::string &str); void sendString(const std::string &str);
void setCursor(int line, int position); void setCursor(int line, int position);
void clear(); void clear();