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PICoHolic
Joined: 04 Jan 2005
Posts: 224
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| USB support on PIC24EP devices |
 Posted: Fri Feb 03, 2012 2:36 am |
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Hi to all,
Has anyone been able to test USB on PIC24EP devices (24EP512GU810 for ex). This device is supported by the latest compiler version, however USB is not.
Thank you |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Fri Feb 03, 2012 3:27 am |
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| What's the specific USB support problem with these devices? Is the USB hardware different from 24FJxxxGB types? |
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PICoHolic
Joined: 04 Jan 2005
Posts: 224
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| Posted: Fri Feb 03, 2012 5:57 am |
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I was trying to run the ex_usb_serial example provided by CCS.
I have added a new definition of a board (PIC24E starter kit) as follows:
| Code: |
#include <24EP512GU810.h>
#include "C:\24EP512GU810_registers.h"
#FUSES PR_PLL //Primary Oscillator with PLL
#FUSES XT //Crystal osc <= 4mhz for PCM/PCH , 3mhz to 10 mhz for PCD
#FUSES NOGSSK //General Segment Key bits, use if using either NOWRT or NOPROTECT fuses
#FUSES CKSNOFSM //Clock Switching is enabled, fail Safe clock monitor is disabled
#FUSES ALTI2C1 //I2C1 mapped to ASDA1/ASCL1 pins
#FUSES NOJTAG //JTAG disabled
#FUSES NOWDT
#device ADC=8
#use delay(clock=120M)
#pin_select U1TX = PIN_D5
#pin_select U1RX = PIN_D4
#define LED1 PIN_D0
#define LED2 PIN_D1
#define LED3 PIN_D2
#define LED_ON(x) output_high(x)
#define LED_OFF(x) output_low(x)
#define BUTTON_PRESSED() !input(PIN_D6)
#define BUTTON2_PRESSED() !input(PIN_D7)
#define HW_ADC_PORTS sAN5
#define HW_ADC_CHANNEL 5
#define HW_ADC_CONFIG ADC_CLOCK_INTERNAL | ADC_TAD_MUL_31
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And the following code to the beginning of the main function (as written in the MCP C33 USB code):
| Code: |
MCU_ANSELA = 0x0000;
MCU_ANSELB = 0x0000;
MCU_ANSELC = 0x0000;
MCU_ANSELD = 0x0000;
MCU_ANSELE = 0x0000;
MCU_ANSELG = 0x0000;
MCU_RPINR19 = 0;
MCU_RPINR19 = 0x64;
MCU_RPOR9.RP101R = 0x3;
// Configure the device PLL to obtain 60 MIPS operation. The crystal
// frequency is 8MHz. Divide 8MHz by 2, multiply by 60 and divide by
// 2. This results in Fosc of 120MHz. The CPU clock frequency is
// Fcy = Fosc/2 = 60MHz. Wait for the Primary PLL to lock and then
// configure the auxilliary PLL to provide 48MHz needed for USB
// Operation.
MCU_PLLFBD = 38; /* M = 60 */
MCU_CLKDIV.PLLPOST = 0; /* N1 = 2 */
MCU_CLKDIV.PLLPRE = 0; /* N2 = 2 */
MCU_OSCTUN = 0;
LED_ON(LED1);
/* Initiate Clock Switch to Primary
* Oscillator with PLL (NOSC= 0x3)*/
//__builtin_write_OSCCONH(0x03);
//__builtin_write_OSCCONL(0x01);
#asm
//Place the New Oscillator Selection in W0
MOV 0x03,w0
//OSCCONH (high byte) Unlock Sequence
MOV MCU_OSCCONH, w1
MOV 0x78, w2
MOV 0x9A, w3
MOV.B w2, [w1] // Write 0x78
MOV.B w3, [w1] // Write 0x9A
//Set New Oscillator Selection
MOV.B w0, [w1]
//Place 0x01 in W0 for setting clock switch enabled bit
MOV 0x01, w0
//OSCCONL (low byte) Unlock Sequence
MOV MCU_OSCCONL, w1
MOV 0x46, w2
MOV 0x57, w3
MOV.B w2, [w1] //Write 0x46
MOV.B w3, [w1] //Write 0x57
//Enable Clock Switch
MOV.B w0, [w1] //Request Clock Switching by Setting OSWEN bit
wait:
btsc MCU_OSCCONL, 0 //#OSWEN
bra wait
#endasm
LED_ON(LED2);
while (MCU_OSCCON.COSC != 0x3);
LED_ON(LED3);
// Configuring the auxiliary PLL, since the primary
// oscillator provides the source clock to the auxiliary
// PLL, the auxiliary oscillator is disabled. Note that
// the AUX PLL is enabled. The input 8MHz clock is divided
// by 2, multiplied by 24 and then divided by 2. Wait till
// the AUX PLL locks.
MCU_ACLKCON3 = 0x24C1;
MCU_ACLKDIV3 = 0x7;
MCU_ACLKCON3.ENAPLL = 1;
while(MCU_ACLKCON3.APLLCK != 1);
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The clock configuration is OK, 60MIPS. I'm still testing IO peripherals, but seems to be working till now; except for USB.
Thanks |
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