Christian Dupaty
Demo MAX7219 library on MIKROELEKTRONIKA Serial 7-Seg Display 8-Digit
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MAX7219
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Maxim Integrated
Demo MAX7219 library on MIKROELEKTRONIKA Serial 7-Seg Display 8-Digit This demo has been tested on NUCLEO-F411RE
For 7 segments display : https://www.mikroe.com/serial-7-seg-8-digit-board
For MAX7219 https://www.maximintegrated.com/en/products/power/display-power-control/MAX7219.html
use library https://os.mbed.com/teams/Maxim-Integrated/code/MAX7219/
7 segments display is connected to default SPI on Arduino connectors. STM32 MISO on RC5_PB5 (MOSI) STM32 MOSI on MISO STM32 SCK on RC3_RF3 (SCK) STM32 SS on CS0 5v GND
see manual (https://download.mikroe.com/documents/add-on-boards/other/display/serial-7seg-8-digit-display/serial-7seg-8-digit-display-manual-v100.pdf ) and photo for details
Revision 5:d181c7532341, committed 2018-03-23
- Comitter:
- cdupaty
- Date:
- Fri Mar 23 14:26:12 2018 +0000
- Parent:
- 4:b5e4379a3d90
- Commit message:
- Demo MAX7219 library on MIKROELEKTRONIKA Serial 7-Seg Display 8-Digit; Update 1
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r b5e4379a3d90 -r d181c7532341 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Mar 23 14:26:12 2018 +0000
@@ -0,0 +1,48 @@
+/* C.Dupaty
+* 03-2018
+* Demo MAX7219 library on MIKROELEKTRONIKA Serial 7-Seg Display 8-Digit
+* https://www.mikroe.com/serial-7-seg-8-digit-board
+* https://www.maximintegrated.com/en/products/power/display-power-control/MAX7219.html
+* see library here https://os.mbed.com/teams/Maxim-Integrated/code/MAX7219/
+*/
+
+#include "mbed.h"
+#include "max7219.h"
+
+Max7219 max7219(SPI_MOSI, SPI_MISO, SPI_SCK, SPI_CS); // satndard SPI on NUCLEO BOARD
+
+// print decimal number on the display
+void affN(unsigned int n)
+{
+// 7 segments code for print numbers [0..9] see MAX7219 datasheet
+const unsigned char code7seg[]={0x7E,0x30,0x6D,0x79,0x33,0x5B,0x5F,0x70,0x7F,0x7B};
+ int i = 1;
+ while (n != 0)
+ {
+ max7219.write_digit(1, i++, code7seg[n % 10]);
+ n /= 10;
+ }
+ while(i<9) max7219.write_digit(1, i++, code7seg[0]);
+}
+
+int main()
+{
+int nb=0;
+ max7219_configuration_t cfg = {
+ .device_number = 1, // device number (only one in this demo)
+ .decode_mode = 0, // mode 0, no decode (see MAX7219 datasheet page 7)
+ .intensity = Max7219::MAX7219_INTENSITY_4, // intensity of light ( 1 to 8)
+ .scan_limit = Max7219::MAX7219_SCAN_8 // nb of digits to print
+ };
+ max7219.init_device(cfg);
+ max7219.enable_device(1);
+ max7219.set_display_test(); // flash all segments for test
+ wait(1);
+ max7219.clear_display_test();
+ // a simple 32 bits counter
+ while (1) {
+ affN(nb++);
+ if(nb>=4000000000) nb=0; // for example
+ wait(0.1);
+ }
+}
diff -r b5e4379a3d90 -r d181c7532341 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Mar 23 14:26:12 2018 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/994bdf8177cb \ No newline at end of file