lu sheng / Mbed 2 deprecated nucleo_spi_max7219_led8x8

nucleo_spi_max7219_led8x8

Dependencies:   MAX7219 mbed

Fork of 06_spi_max7219_led8x8 by hobbielektronika

main.cpp@1:e065a60fea05, 2016-11-02 (annotated)

Committer:
anywill
Date:
Wed Nov 02 02:46:17 2016 +0000
Revision:
1:e065a60fea05
Parent:
0:bd34a367f642 
nucleo_spi_max7219_led8x8

Who changed what in which revision?

UserRevisionLine numberNew contents of line
anywill 1:e065a60fea05 1 /* nucleo_spi_max7219_led8x8
anywill 1:e065a60fea05 2 *
icserny 0:bd34a367f642 3 * Simple demo to drive a 8x8-as LED matrix by a MAX7219 LED driver IC
icserny 0:bd34a367f642 4 * After initialisation two characters (H and W) are displayed alternatively.
icserny 0:bd34a367f642 5 * The MAX7219 IC is driven by hardware SPI: SPI0 module at PTD1, PTD2, PTD3.
icserny 0:bd34a367f642 6 */
icserny 0:bd34a367f642 7
icserny 0:bd34a367f642 8 #include "mbed.h"
anywill 1:e065a60fea05 9 //#include "max7219.h" //此头文件未使用
anywill 1:e065a60fea05 10 SPI spi(D11, D12, D13); // Arduino compatible MOSI, MISO, SCLK
anywill 1:e065a60fea05 11 //nucleo MOSI, MISO, SCLK
anywill 1:e065a60fea05 12 // PTD2, PTD3, PTD1
anywill 1:e065a60fea05 13 DigitalOut cs(D10); // Chip select
icserny 0:bd34a367f642 14
icserny 0:bd34a367f642 15 const unsigned char led1[]= {
anywill 1:e065a60fea05 16 0x0,0x66,0x99,0x81,0x42,0x24,0x18,0x0
anywill 1:e065a60fea05 17 }; //心
icserny 0:bd34a367f642 18 const unsigned char led2[]= {
anywill 1:e065a60fea05 19 0x3C,0x24,0x24,0xFF,0xFF,0x24,0x24,0x3C
anywill 1:e065a60fea05 20 }; //中
icserny 0:bd34a367f642 21
icserny 0:bd34a367f642 22 /// Send two bytes to SPI bus
icserny 0:bd34a367f642 23 void SPI_Write2(unsigned char MSB, unsigned char LSB)
icserny 0:bd34a367f642 24 {
icserny 0:bd34a367f642 25 cs = 0; // Set CS Low
icserny 0:bd34a367f642 26 spi.write(MSB); // Send two bytes
icserny 0:bd34a367f642 27 spi.write(LSB);
icserny 0:bd34a367f642 28 cs = 1; // Set CS High
icserny 0:bd34a367f642 29 }
icserny 0:bd34a367f642 30
icserny 0:bd34a367f642 31 /// MAX7219 initialisation
icserny 0:bd34a367f642 32 void Init_MAX7219(void)
icserny 0:bd34a367f642 33 {
icserny 0:bd34a367f642 34 SPI_Write2(0x09, 0x00); // Decoding off
icserny 0:bd34a367f642 35 SPI_Write2(0x0A, 0x08); // Brightness to intermediate
icserny 0:bd34a367f642 36 SPI_Write2(0x0B, 0x07); // Scan limit = 7
icserny 0:bd34a367f642 37 SPI_Write2(0x0C, 0x01); // Normal operation mode
icserny 0:bd34a367f642 38 SPI_Write2(0x0F, 0x0F); // Enable display test
icserny 0:bd34a367f642 39 wait_ms(500); // 500 ms delay
icserny 0:bd34a367f642 40 SPI_Write2(0x01, 0x00); // Clear row 0.
icserny 0:bd34a367f642 41 SPI_Write2(0x02, 0x00); // Clear row 1.
icserny 0:bd34a367f642 42 SPI_Write2(0x03, 0x00); // Clear row 2.
icserny 0:bd34a367f642 43 SPI_Write2(0x04, 0x00); // Clear row 3.
icserny 0:bd34a367f642 44 SPI_Write2(0x05, 0x00); // Clear row 4.
icserny 0:bd34a367f642 45 SPI_Write2(0x06, 0x00); // Clear row 5.
icserny 0:bd34a367f642 46 SPI_Write2(0x07, 0x00); // Clear row 6.
icserny 0:bd34a367f642 47 SPI_Write2(0x08, 0x00); // Clear row 7.
icserny 0:bd34a367f642 48 SPI_Write2(0x0F, 0x00); // Disable display test
icserny 0:bd34a367f642 49 wait_ms(500); // 500 ms delay
icserny 0:bd34a367f642 50 }
icserny 0:bd34a367f642 51
icserny 0:bd34a367f642 52 int main()
icserny 0:bd34a367f642 53 {
icserny 0:bd34a367f642 54 cs = 1; // CS initially High
icserny 0:bd34a367f642 55 spi.format(8,0); // 8-bit format, mode 0,0
icserny 0:bd34a367f642 56 spi.frequency(1000000); // SCLK = 1 MHz
icserny 0:bd34a367f642 57 Init_MAX7219(); // Initialize the LED controller
anywill 1:e065a60fea05 58
icserny 0:bd34a367f642 59 while (1) {
icserny 0:bd34a367f642 60 for(int i=1; i<9; i++) // Write first character (8 rows)
icserny 0:bd34a367f642 61 SPI_Write2(i,led1[i-1]);
icserny 0:bd34a367f642 62 wait(1); // 1 sec delay
icserny 0:bd34a367f642 63 for(int i=1; i<9; i++) // Write second character
icserny 0:bd34a367f642 64 SPI_Write2(i,led2[i-1]);
icserny 0:bd34a367f642 65 wait(1); // 1 sec delay
icserny 0:bd34a367f642 66 }
icserny 0:bd34a367f642 67 }