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esphome/esphome/components/max7219/max7219.cpp

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#include "max7219.h"
#include "esphome/core/log.h"
#include "esphome/core/helpers.h"
#include "esphome/core/hal.h"
namespace esphome {
namespace max7219 {
static const char *const TAG = "max7219";
static const uint8_t MAX7219_REGISTER_NOOP = 0x00;
static const uint8_t MAX7219_REGISTER_DECODE_MODE = 0x09;
static const uint8_t MAX7219_REGISTER_INTENSITY = 0x0A;
static const uint8_t MAX7219_REGISTER_SCAN_LIMIT = 0x0B;
static const uint8_t MAX7219_REGISTER_SHUTDOWN = 0x0C;
static const uint8_t MAX7219_REGISTER_TEST = 0x0F;
static const uint8_t MAX7219_UNKNOWN_CHAR = 0b11111111;
const uint8_t MAX7219_ASCII_TO_RAW[95] PROGMEM = {
0b00000000, // ' ', ord 0x20
0b10110000, // '!', ord 0x21
0b00100010, // '"', ord 0x22
MAX7219_UNKNOWN_CHAR, // '#', ord 0x23
MAX7219_UNKNOWN_CHAR, // '$', ord 0x24
0b01001001, // '%', ord 0x25
MAX7219_UNKNOWN_CHAR, // '&', ord 0x26
0b00000010, // ''', ord 0x27
0b01001110, // '(', ord 0x28
0b01111000, // ')', ord 0x29
0b01000000, // '*', ord 0x2A
MAX7219_UNKNOWN_CHAR, // '+', ord 0x2B
0b00010000, // ',', ord 0x2C
0b00000001, // '-', ord 0x2D
0b10000000, // '.', ord 0x2E
MAX7219_UNKNOWN_CHAR, // '/', ord 0x2F
0b01111110, // '0', ord 0x30
0b00110000, // '1', ord 0x31
0b01101101, // '2', ord 0x32
0b01111001, // '3', ord 0x33
0b00110011, // '4', ord 0x34
0b01011011, // '5', ord 0x35
0b01011111, // '6', ord 0x36
0b01110000, // '7', ord 0x37
0b01111111, // '8', ord 0x38
0b01111011, // '9', ord 0x39
0b01001000, // ':', ord 0x3A
0b01011000, // ';', ord 0x3B
MAX7219_UNKNOWN_CHAR, // '<', ord 0x3C
0b00001001, // '=', ord 0x3D
MAX7219_UNKNOWN_CHAR, // '>', ord 0x3E
0b01100101, // '?', ord 0x3F
0b01101111, // '@', ord 0x40
0b01110111, // 'A', ord 0x41
0b00011111, // 'B', ord 0x42
0b01001110, // 'C', ord 0x43
0b00111101, // 'D', ord 0x44
0b01001111, // 'E', ord 0x45
0b01000111, // 'F', ord 0x46
0b01011110, // 'G', ord 0x47
0b00110111, // 'H', ord 0x48
0b00110000, // 'I', ord 0x49
0b00111100, // 'J', ord 0x4A
MAX7219_UNKNOWN_CHAR, // 'K', ord 0x4B
0b00001110, // 'L', ord 0x4C
MAX7219_UNKNOWN_CHAR, // 'M', ord 0x4D
0b00010101, // 'N', ord 0x4E
0b01111110, // 'O', ord 0x4F
0b01100111, // 'P', ord 0x50
0b11111110, // 'Q', ord 0x51
0b00000101, // 'R', ord 0x52
0b01011011, // 'S', ord 0x53
0b00000111, // 'T', ord 0x54
0b00111110, // 'U', ord 0x55
0b00111110, // 'V', ord 0x56
0b00111111, // 'W', ord 0x57
MAX7219_UNKNOWN_CHAR, // 'X', ord 0x58
0b00100111, // 'Y', ord 0x59
0b01101101, // 'Z', ord 0x5A
0b01001110, // '[', ord 0x5B
MAX7219_UNKNOWN_CHAR, // '\', ord 0x5C
0b01111000, // ']', ord 0x5D
MAX7219_UNKNOWN_CHAR, // '^', ord 0x5E
0b00001000, // '_', ord 0x5F
0b00100000, // '`', ord 0x60
0b01110111, // 'a', ord 0x61
0b00011111, // 'b', ord 0x62
0b00001101, // 'c', ord 0x63
0b00111101, // 'd', ord 0x64
0b01001111, // 'e', ord 0x65
0b01000111, // 'f', ord 0x66
0b01011110, // 'g', ord 0x67
0b00010111, // 'h', ord 0x68
0b00010000, // 'i', ord 0x69
0b00111100, // 'j', ord 0x6A
MAX7219_UNKNOWN_CHAR, // 'k', ord 0x6B
0b00001110, // 'l', ord 0x6C
MAX7219_UNKNOWN_CHAR, // 'm', ord 0x6D
0b00010101, // 'n', ord 0x6E
0b00011101, // 'o', ord 0x6F
0b01100111, // 'p', ord 0x70
MAX7219_UNKNOWN_CHAR, // 'q', ord 0x71
0b00000101, // 'r', ord 0x72
0b01011011, // 's', ord 0x73
0b00000111, // 't', ord 0x74
0b00011100, // 'u', ord 0x75
0b00011100, // 'v', ord 0x76
MAX7219_UNKNOWN_CHAR, // 'w', ord 0x77
MAX7219_UNKNOWN_CHAR, // 'x', ord 0x78
0b00100111, // 'y', ord 0x79
MAX7219_UNKNOWN_CHAR, // 'z', ord 0x7A
0b00110001, // '{', ord 0x7B
0b00000110, // '|', ord 0x7C
0b00000111, // '}', ord 0x7D
0b01100011, // '~', ord 0x7E (degree symbol)
};
float MAX7219Component::get_setup_priority() const { return setup_priority::PROCESSOR; }
void MAX7219Component::setup() {
ESP_LOGCONFIG(TAG, "Setting up MAX7219...");
this->spi_setup();
this->buffer_ = new uint8_t[this->num_chips_ * 8]; // NOLINT
for (uint8_t i = 0; i < this->num_chips_ * 8; i++)
this->buffer_[i] = 0;
// let's assume the user has all 8 digits connected, only important in daisy chained setups anyway
this->send_to_all_(MAX7219_REGISTER_SCAN_LIMIT, 7);
// let's use our own ASCII -> led pattern encoding
this->send_to_all_(MAX7219_REGISTER_DECODE_MODE, 0);
this->send_to_all_(MAX7219_REGISTER_INTENSITY, this->intensity_);
this->display();
// power up
this->send_to_all_(MAX7219_REGISTER_TEST, 0);
this->send_to_all_(MAX7219_REGISTER_SHUTDOWN, 1);
}
void MAX7219Component::dump_config() {
ESP_LOGCONFIG(TAG, "MAX7219:");
ESP_LOGCONFIG(TAG, " Number of Chips: %u", this->num_chips_);
ESP_LOGCONFIG(TAG, " Intensity: %u", this->intensity_);
LOG_PIN(" CS Pin: ", this->cs_);
LOG_UPDATE_INTERVAL(this);
}
void MAX7219Component::display() {
for (uint8_t i = 0; i < 8; i++) {
this->enable();
for (uint8_t j = 0; j < this->num_chips_; j++) {
if (reverse_) {
this->send_byte_(8 - i, buffer_[(num_chips_ - j - 1) * 8 + i]);
} else {
this->send_byte_(8 - i, buffer_[j * 8 + i]);
}
}
this->disable();
}
}
void MAX7219Component::send_byte_(uint8_t a_register, uint8_t data) {
this->write_byte(a_register);
this->write_byte(data);
}
void MAX7219Component::send_to_all_(uint8_t a_register, uint8_t data) {
this->enable();
for (uint8_t i = 0; i < this->num_chips_; i++)
this->send_byte_(a_register, data);
this->disable();
}
void MAX7219Component::update() {
for (uint8_t i = 0; i < this->num_chips_ * 8; i++)
this->buffer_[i] = 0;
if (this->writer_.has_value())
(*this->writer_)(*this);
this->display();
}
uint8_t MAX7219Component::print(uint8_t start_pos, const char *str) {
uint8_t pos = start_pos;
for (; *str != '\0'; str++) {
uint8_t data = MAX7219_UNKNOWN_CHAR;
if (*str >= ' ' && *str <= '~')
data = progmem_read_byte(&MAX7219_ASCII_TO_RAW[*str - ' ']);
if (data == MAX7219_UNKNOWN_CHAR) {
ESP_LOGW(TAG, "Encountered character '%c' with no MAX7219 representation while translating string!", *str);
}
if (*str == '.') {
if (pos != start_pos)
pos--;
this->buffer_[pos] |= 0b10000000;
} else {
if (pos >= this->num_chips_ * 8) {
ESP_LOGE(TAG, "MAX7219 String is too long for the display!");
break;
}
this->buffer_[pos] = data;
}
pos++;
}
return pos - start_pos;
}
uint8_t MAX7219Component::print(const char *str) { return this->print(0, str); }
uint8_t MAX7219Component::printf(uint8_t pos, const char *format, ...) {
va_list arg;
va_start(arg, format);
char buffer[64];
int ret = vsnprintf(buffer, sizeof(buffer), format, arg);
va_end(arg);
if (ret > 0)
return this->print(pos, buffer);
return 0;
}
uint8_t MAX7219Component::printf(const char *format, ...) {
va_list arg;
va_start(arg, format);
char buffer[64];
int ret = vsnprintf(buffer, sizeof(buffer), format, arg);
va_end(arg);
if (ret > 0)
return this->print(buffer);
return 0;
}
void MAX7219Component::set_writer(max7219_writer_t &&writer) { this->writer_ = writer; }
void MAX7219Component::set_intensity(uint8_t intensity) {
this->intensity_ = intensity;
this->send_to_all_(MAX7219_REGISTER_INTENSITY, this->intensity_);
}
void MAX7219Component::set_num_chips(uint8_t num_chips) { this->num_chips_ = num_chips; }
#ifdef USE_TIME
uint8_t MAX7219Component::strftime(uint8_t pos, const char *format, time::ESPTime time) {
char buffer[64];
size_t ret = time.strftime(buffer, sizeof(buffer), format);
if (ret > 0)
return this->print(pos, buffer);
return 0;
}
uint8_t MAX7219Component::strftime(const char *format, time::ESPTime time) { return this->strftime(0, format, time); }
#endif
} // namespace max7219
} // namespace esphome
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