Read a descriptor (not yet working)

k66_usbhost.ino

 
 
 uint32_t periodictable[64] __attribute__ ((aligned(4096), used));
-uint32_t qh[12] __attribute__ ((aligned(64)));
+volatile uint32_t qh[12] __attribute__ ((aligned(64)));
+uint32_t qtd_dummy[8] __attribute__ ((aligned(32)));
 uint32_t qtd_setup[8] __attribute__ ((aligned(32)));
 uint32_t qtd_in[8] __attribute__ ((aligned(32)));
 uint32_t qtd_outack[8] __attribute__ ((aligned(32)));
+uint32_t setupbuf[2] __attribute__ ((aligned(8)));
+uint32_t inbuf[16] __attribute__ ((aligned(64)));
 
 
 void setup()
 	qh[0] = ((uint32_t)qh) | 2;
 	qh[1] = 0x0040E000; // addr=0, ep=0
 	qh[2] = 0x40000000;
-	qh[3] = (uint32_t)qtd_setup;
+	qh[3] = 0;
 	qh[4] = 1;
-	qh[5] = 0;
-	qh[6] = 0;
+	qh[5] = 1;
+	qh[6] = 0x40;
 	qh[7] = 0;
 	qh[8] = 0;
 	qh[9] = 0;
 	qh[10] = 0;
 	qh[11] = 0;
-	qtd_setup[0] = 1;
-	qtd_setup[1] = 1;
-	qtd_setup[2] = 0; // 0 = not active
-	qtd_setup[3] = 0;
-	qtd_setup[4] = 0;
-	qtd_setup[5] = 0;
-	qtd_setup[6] = 0;
-	qtd_setup[7] = 0;
+	qtd_dummy[0] = 1;
+	qtd_dummy[1] = 1;
+	qtd_dummy[2] = 0x40; // 0x40 = halted
+	qtd_dummy[3] = 0;
+	qtd_dummy[4] = 0;
+	qtd_dummy[5] = 0;
+	qtd_dummy[6] = 0;
+	qtd_dummy[7] = 0;
 
 	// turn on the USBHS controller
 	USBHS_USBMODE = USBHS_USBMODE_TXHSD(5) | USBHS_USBMODE_CM(3); // host mode
 	USBHS_ASYNCLISTADDR = (uint32_t)qh;
 	USBHS_USBCMD = USBHS_USBCMD_ITC(0) | USBHS_USBCMD_RS | USBHS_USBCMD_ASP(3) |
 		USBHS_USBCMD_FS2 | USBHS_USBCMD_FS(0) | // periodic table is 64 pointers
-		USBHS_USBCMD_PSE | USBHS_USBCMD_ASE;
+		// USBHS_USBCMD_PSE |
+		USBHS_USBCMD_ASE;
 	USBHS_PORTSC1 |= USBHS_PORTSC_PP;
 	//USBHS_PORTSC1 |= USBHS_PORTSC_PFSC; // force 12 Mbit/sec
 	//USBHS_PORTSC1 |= USBHS_PORTSC_PHCD; // phy off
 }
 
 
+void read_descriptor(uint16_t value, uint16_t index, uint32_t len)
+{
+	uint32_t token;
+
+	if (len > 512) len = 512;
+	Serial.println("Read Device Descriptor...");
+
+	qtd_setup[0] = (uint32_t)qtd_in;
+	qtd_setup[1] = 1;
+	qtd_setup[2] = 0x00080E80;
+	qtd_setup[3] = (uint32_t)setupbuf;
+
+	setupbuf[0] = (value << 16) | (0x06 << 8) | 0x80;
+	setupbuf[1] = (len << 16) | index;
+
+	qtd_in[0] = (uint32_t)qtd_outack;
+	qtd_in[1] = 1;
+	qtd_in[2] = 0x80000000 | (len << 16) | 0x0D80;
+	qtd_in[3] = (uint32_t)inbuf;
+
+	qtd_outack[0] = 1;
+	qtd_outack[1] = 1;
+	qtd_outack[2] = 0x80400C80;
+	qtd_outack[3] = 0;
+
+	// add to QH
+
+	// Save the content of the token field of the first qTD to be added
+	token = qtd_setup[2];
+
+	// Change the token of the first qTD so its Halted bit is set as 1
+	// and all other bits are zero
+	qtd_setup[2] = 0x40;
+
+	// copy the content of the first qTD to the dummy qTD
+	memcpy(qtd_dummy, qtd_setup, 32);
+
+	// Link the first qTD to the last of the qTD of the newly qTD list
+	qtd_outack[0] = (uint32_t)qtd_setup;
+
+	// Restore the token value to the previous dummy qTD's oken field
+	qtd_dummy[2] = token;
+	// qtd_setup becomes the dummy token... so this only works once!
+
+	delay(1);
+	Serial.println(qtd_dummy[2], HEX);
+	Serial.println(qtd_in[2], HEX);
+	Serial.println(qtd_outack[2], HEX);
+	Serial.println(qtd_setup[2], HEX);
+}
+
+
 void loop()
 {
 	static unsigned int count=0;
 		Serial.println("End Reset Sequence...");
 		USBHS_PORTSC1 &= ~USBHS_PORTSC_PR;
 	}
+	if (count == 22) {
+		read_descriptor(1, 0, 8); // device descriptor
+	}
 	if (count > 5000) {
 		while (1) ; // stop here
 	}