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JavaScript BigBanging SPI MAX7219

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This commit is contained in:
Derek Jamison 2024-07-13 09:46:17 -06:00
parent c9c8ecdb95
commit b714ac51f4
1 changed files with 69 additions and 0 deletions
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69
js/spi_bitbang/max7219.js Normal file
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let gpio = require("gpio");
let gpio_spi_mosi = "PA7";
let gpio_spi_sck = "PB3";
let gpio_spi_cs = "PA4";
gpio.init(gpio_spi_mosi, "outputPushPull", "none");
gpio.init(gpio_spi_sck, "outputPushPull", "none");
gpio.init(gpio_spi_cs, "outputPushPull", "none");
function leds(addr, data) {
gpio.write(gpio_spi_mosi, false);
gpio.write(gpio_spi_sck, false);
gpio.write(gpio_spi_cs, false);
let mask = 0x80;
for (let i = 0; i < 8; i++) {
gpio.write(gpio_spi_mosi, (addr & mask) !== 0);
gpio.write(gpio_spi_sck, true);
gpio.write(gpio_spi_sck, false);
mask >>= 1;
}
for (let i = 0; i < 8; i++) {
gpio.write(gpio_spi_mosi, data[i] !== ' ' && data[i] !== '0');
gpio.write(gpio_spi_sck, true);
gpio.write(gpio_spi_sck, false);
}
gpio.write(gpio_spi_cs, true);
gpio.write(gpio_spi_mosi, true);
gpio.write(gpio_spi_sck, true);
}
// Initialize MAX7219 device
leds(0xFF, "00000000");
leds(0x0C, "00000001");
leds(0x09, "00000000");
leds(0x0A, "00000111");
leds(0x0B, "00000111");
for (let loop_counter = 0; loop_counter < 10; loop_counter++) {
// Draw the pattern (0 = off, 1 = on)
leds(0x1, " **** ");
leds(0x2, " * * ");
leds(0x3, "* *");
leds(0x4, "* *");
leds(0x5, "* *");
leds(0x6, "* *");
leds(0x7, " * * ");
leds(0x8, " **** ");
delay(250); // Wait 1/4 second
// Draw the pattern (0 = off, 1 = on)
leds(0x1, " **** ");
leds(0x2, " * * ");
leds(0x3, "* *");
leds(0x4, "* * * *");
leds(0x5, "* *");
leds(0x6, "* **** *");
leds(0x7, " * * ");
leds(0x8, " **** ");
delay(250); // Wait 1/4 second
}
gpio.init(gpio_spi_mosi, "analog", "none");
gpio.init(gpio_spi_sck, "analog", "none");
gpio.init(gpio_spi_cs, "analog", "none");