VitoMatteo Di Pietro
/
write_RAM_from_serial_without_burst
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Diff: main.cpp
- Revision:
- 0:6592dd426afa
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Jan 09 16:18:06 2014 +0000
@@ -0,0 +1,73 @@
+#include "mbed.h"
+
+Serial pc(USBTX, USBRX); // tx, rx
+
+SPI spi(PTD2, PTD3, PTD1); // mosi, miso, sclk
+DigitalOut cs(PTD0);
+
+DigitalOut led_red(LED_RED);
+DigitalOut led_green(LED_GREEN);
+
+unsigned char c, a, m;
+unsigned char dato;
+
+int main()
+{
+ // Chip must be deselected
+ cs = 1;
+
+ // Setup the spi for 8 bit data
+ spi.format(8,1); //CPOL=0 , CPHA=1 ---> al fronte di salita inizia il bit
+ spi.frequency(800000); // 1 MHz
+ led_red = 1;
+ led_green = 1;
+ pc.baud(115200);
+
+ while(1)
+ {
+ pc.printf("\nPremi 0 per scrittura o 1 per lettura: ");
+ m = pc.getc();
+ switch(m)
+ {
+ case '0': pc.printf("\nInserisci il dato: ");
+ c = pc.getc();
+ pc.printf("\nInserisci l'indirizzo: ");
+ a = pc.getc();
+
+ // write RAM
+ cs = 0;
+ spi.write('#');
+ spi.write(0x06);
+ spi.write(a); //address MSB
+ spi.write(0x01);
+ spi.write(0x01); // address LSB
+ spi.write('#');
+ spi.write(c);
+ while(spi.write(0x55) != '@');
+ pc.printf("\n%c scritto all'indirizzo %c.", c, a);
+ cs = 1;
+ wait(0.01);
+ break;
+
+ case '1': pc.printf("\nInserisci l'indirizzo: ");
+ a = pc.getc();
+ // read RAM
+ cs = 0;
+ spi.write('#');
+ spi.write(0x04);
+ spi.write(a); //address MSB
+ spi.write(0x01);
+ spi.write(0x01); // address LSB
+ while(spi.write(0x55) != '@');// come sopra
+ dato = spi.write(0x55);
+ pc.printf("\nDato letto da RAM all'indirizzo %c: %c", a, dato );
+ dato = spi.write(0x55);
+ pc.printf("%c", dato);
+ cs = 1;
+ wait(0.01);
+
+ default: pc.printf("\nComando errato.");
+ break;
+ }
+ }
+}
\ No newline at end of file