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Programme de démo pour la gestion de 4 afficheurs 64 leds
main.cpp
- Committer:
- vermaelen
- Date:
- 2022-03-28
- Revision:
- 1:61f61158c345
- Parent:
- 0:bd34a367f642
- Child:
- 2:675b923da5d2
File content as of revision 1:61f61158c345:
/* 06_spi_max7219_led8x8 * * Simple demo to drive a 8x8-as LED matrix by a MAX7219 LED driver IC * After initialisation two characters (H and W) are displayed alternatively. * The MAX7219 IC is driven by hardware SPI: SPI0 module at PTD1, PTD2, PTD3. */ #include "mbed.h" #include "lib_matrix.h" SPI spi(D11,D12,D13); // Arduino compatible MOSI, MISO, SCLK DigitalOut cs(D14); // Chip select int main() { cs = 1; // CS initially High spi.format(8,0); // 8-bit format, mode 0,0 spi.frequency(1000000); // SCLK = 1 MHz Init_MAX7219(); // Initialize the LED controller char tab[20]="HELLOWO&&&"; int i=0; while (1) { disp(tab[i]); i=(i+1)%10; wait(0.5); disp(' '); wait(0.1); // 1 sec delay } } void disp(char c) { switch(c) { case 'E' : for(int i=1; i<9; i++) // Write first character (8 rows) SPI_Write2(i,led_E[i-1]); break; case 'H' : for(int i=1; i<9; i++) // Write first character (8 rows) SPI_Write2(i,led_H[i-1]); break; case 'L' : for(int i=1; i<9; i++) // Write first character (8 rows) SPI_Write2(i,led_L[i-1]); break; case 'O' : for(int i=1; i<9; i++) // Write first character (8 rows) SPI_Write2(i,led_O[i-1]); break; case 'W' : // 1 sec delay for(int i=1; i<9; i++) // Write second character SPI_Write2(i,led_W[i-1]); break; case ' ' : // 1 sec delay for(int i=1; i<9; i++) // Write second character SPI_Write2(i,led_blank[i-1]); break; case '&' : // 1 sec delay for(int i=1; i<9; i++) // Write second character SPI_Write2(i,led_heart[i-1]); break; } } /// Send two bytes to SPI bus void SPI_Write2(unsigned char MSB, unsigned char LSB) { cs = 0; // Set CS Low spi.write(MSB); // Send two bytes spi.write(LSB); cs = 1; // Set CS High } /// MAX7219 initialisation void Init_MAX7219(void) { SPI_Write2(0x09, 0x00); // Decoding off SPI_Write2(0x0A, 0x08); // Brightness to intermediate SPI_Write2(0x0B, 0x07); // Scan limit = 7 SPI_Write2(0x0C, 0x01); // Normal operation mode SPI_Write2(0x0F, 0x0F); // Enable display test wait_ms(500); // 500 ms delay SPI_Write2(0x01, 0x00); // Clear row 0. SPI_Write2(0x02, 0x00); // Clear row 1. SPI_Write2(0x03, 0x00); // Clear row 2. SPI_Write2(0x04, 0x00); // Clear row 3. SPI_Write2(0x05, 0x00); // Clear row 4. SPI_Write2(0x06, 0x00); // Clear row 5. SPI_Write2(0x07, 0x00); // Clear row 6. SPI_Write2(0x08, 0x00); // Clear row 7. SPI_Write2(0x0F, 0x00); // Disable display test wait_ms(500); // 500 ms delay }