Upload fonts to external SPI Flash¶
The Commercial edition allows to use the external 8 Mbits = 1 MBytes x 8 SPI Flash memory, labelled U1 on the EXT3-1 extension board, to store fonts.
The standard reference of the SPI Flash memory is MX25V2006 . The corresponding chip select pin is numbered 8 on the EXT3-1 extension board.
Option 1: Segger J-Flash SPI¶
The Segger J-Link programmer-debugger offers a fast way to upload the fonts to the external SPI Flash of the EXT3. The List of supported SPI flash devices includes the MX25V2006.
Configure¶
Connect from the J-Link programmer-debugger to the EXT3: the SPI signals CLS, /CS, DI or MOSI, DO or MISO; and power lines VTref and GROUND.
To power the EXT3, either provide an external 3.3V; or connect a 3.3V regulator to the J-Link programmer-debugger 5V-Supply output and turn power on.
Use¶
Two options: by command line or GUI.
Launch
$
JFlashSPI_CL -open Fonts_511.hex -auto
JFlashSPI_CL loads the Fonts_511.hex file, connects to the SPI Flash, uploads and verifies, then disconnects.
Launch the JFlashSPIExe application.
Call the menu File > Open data file… and select the Fonts_511.hex file; or drag-and-drop the Fonts_511.hex file onto the application.
Call the menu Target > Connect to identify the external SPI Flash automatically and then the menu Target > Program to upload and flash the external SPI Flash automatically.
Call the menu File > Exit to quit the application.
More information is available at the page J-Flash SPI — Direct programming of (Q)SPI flashes on the Segger website.
Option 2: highView Fonts Manager¶
Configure¶
Ensure the targeted MCU provides enough memory in Flash to store the fonts.
Open the hV_Fonts_Manager.ino project.
Set the options to write sector 0 and the font and generate the fonts enumeration.
#define WRITE_FLASH_SECTOR_0 1 ///< Write or update sector 0
#define WRITE_FLASH_FONTS 1 ///< Write fonts to Flash
#define SIMULATE_FLASH_SECTOR_0 0 ///< Simulate sector 0
#define READ_FLASH_SECTOR_0 1 ///< Read sector 0
#define READ_FLASH_FONTS 1 ///< Read fonts from Flash
#define GENERATE_FONTS_ENUMERATION 1 ///< Generate code of header file with fonts enumeration
Use¶
Select the fonts to include under the setup() function.
loadFont(Font_DejaVuMono12);
loadFont(Font_DejaVuMono12b);
Build and link, upload and run.
Copy the generated fonts enumeration into the hV_Font_Flash header file for later use with the Fonts from external SPI Flash option.