Diff: main.cpp

Revision:

0:7d8dc5893250

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Sep 22 03:05:17 2019 +0000
@@ -0,0 +1,68 @@
+#include "mbed.h"
+ ////PINES PARA KL-46Z
+ ///%%%%MISO%%%% se conecta al divisor para no dañar el micro puesto que la entrada digital es de 3.3v y el mcp regresa 5v
+ // SI=MOSI
+ // SO=MISO
+ // SO Directo al divisor de voltaje, entrada a las r 2.35k ohms 
+ // salida del divisor a tierra directo intermedio a miso 4.7k ohms
+ // Se conecta al SPI 0 para no interrumpir la acción de los estados de los leds 
+SPI spi(PTA16, PTA17, PTA15); // mosi, miso, sclk
+DigitalOut cs(PTA14);
+// en caso de instalar barra de leds referida a tierra se invierte la polaridad es decir 1=on
+// en el micro estan referidos a voltaje 1=off
+// se invertiria el en¿cendido de los leds con la barra!!
+DigitalOut myled(PTD5); //led verde
+DigitalOut resetled(PTE29); //led rojo
+ 
+ 
+int main()
+{
+    myled = 1;
+    resetled = 1;
+    // Chip must be deselected
+    cs = 1;
+ 
+    // Setup the spi for 8 bit data, high steady state clock,
+    // second edge capture, with a 1MHz clock rate
+    spi.format(8,3);
+    spi.frequency(1000000);
+ 
+    while (1) {
+ 
+        // Select the device by seting chip select low
+        resetled = 0;
+        cs = 0;
+        // Send 0xC0, the command to reset the MCP2515 chip
+        spi.write(0xC0);
+        printf("Resetting the MCP2515 chip.\r\n");
+        // Deselect the device
+        cs = 1;
+        wait_ms(10);
+        resetled = 1;
+ 
+        // Select the device by seting chip select low
+        cs = 0;
+        // Send 0xA0, the command to read the MCP2515 Status register
+        spi.write(0xA0);
+        // Send a dummy byte to receive the contents of the status register
+        int status = spi.write(0x00);
+        printf("status register = 0x%02X.\r\n", status);
+        // Deselect the device
+        cs = 1;
+ 
+        // Select the device by seting chip select low
+        cs = 0;
+        // Send 0x03, the command to read an MCP2515 register
+        spi.write(0x03);
+        // Send 0x0F, the address of the MCP2515 CANCTRL register
+        spi.write(0x0F);
+        // Send a dummy byte to receive the contents of the status register
+        int CANCTRL = spi.write(0x00);
+        printf("CANCTRL register = 0x%02X.\r\n", CANCTRL);
+        // Deselect the device
+        cs = 1;
+ 
+        wait(1);
+        myled = !myled;
+    }
+}
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