![]() celem on ESP32 WiFi failing because SPI Flash partition is not mountedĪcassis on How I created a Docker image for NuttX.Side note for Arduino people: there is a library to control MAX7219 called MaxMatrix (see this tutorial: ×8-led-matrix-max7219-tutorial-scrolling-text-android-control-via-bluetooth/ ), but this MaxMatrix will not work with these modules with clusters of 8×8 matrices as single board because it expects each module to be rotated 90 degrees.Īcassis on ESP32 WiFi failing because SPI Flash partition is not mounted ![]() The MAX7219_XSTRIDE is the number of horizontal 8×8 LED Matrix and MAX7219_YSTRIDE is the number of vertical LED Matrix.Īs you can see I’m sending the “long row” of the LED Matrix starting from the last LED Matrix to avoid the image mirroring and also I’m inverting the row position (8 – row) to avoid the image upside-down. * We need to send last row/column first to avoid mirror image */įor (i = (MAX7219_XSTRIDE * MAX7219_YSTRIDE) - 1 i >= 0 i-) This is a 7-segment display representation: GĪfter this conversion the driver will draw the pixels at right position in the strip and we just need send a single “long row” by time: /* Lock and select the device */ ![]() Following the post about the HC-SR04 Driver creation I decided to post about a new driver I created recently: the MAX7219 used to control 8×8 LED Matrix.Ī single MAX7219 chip can be used to control 8 7-segment displays.
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