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pieter
Joined: 16 Jan 2011
Posts: 27
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| Pic24H clock switch FRC to XT [SOLVED] |
 Posted: Tue Mar 22, 2011 7:40 am |
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Hi,
please help me to switch the clock. I have been trying for > 2 weeks without success, using the asm routines from microchip.
When I program the code with a programmer, it works.
When I load the code from a bootloader it works but I need the uCro to run fast.
The uCro still runs slow after the bootloaded code.
I need the loaded code to switch from the bootloader's FRC to the loaded code's XT with PLL. Crystal = 8 Mhz.
I do program the bootloader with FRC, no PLL, Clock switching enabled.
My Code: please see SWITCH CLOCK (for 10Mhz Xtal) below.
| Code: |
// *
//***********************************************
//
//
#list
#include <c:\mpc\devices\24HJ256GP610.h>
#device ADC=12
#FUSES WDT //Watch Dog Timer
#FUSES NOWRTB //Boot block not write protected
#FUSES NOBSS //No boot segment
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOWRT //Program memory not write protected
#FUSES NOOSCIO //OSC2 is general purpose output
#FUSES PR_PLL //Pimary oscillator
#FUSES XT
#FUSES WPRES128 //Watch Dog Timer PreScalar 1:128
#FUSES WPOSTS16 //Watch Dog Timer PostScalar 1:32768
#FUSES PUT128 //Power On Reset Timer value 128ms
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES NORSS //No secure segment RAM
#FUSES NOSSS //No secure segment
#FUSES NOWRTSS //Secure segment not write protected
#FUSES NORBS //No Boot RAM defined
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOJTAG //JTAG disabled
#use delay(clock=80M, Oscillator=8M,RESTART_WDT)
#use rs232(baud=19200,Uart1, xmit=PIN_F3, rcv=PIN_F2,Errors, STREAM=RS232) // baud=38400 19200
#id 0x0001
#PRAGMA ZERO_RAM
#use fast_io(A)
#use fast_io(B)
#use fast_io(C)
#use fast_io(D)
#use fast_io(E)
#use fast_io(F)
#use fast_io(G)
#byte PLLFBD = 0x746 // bits 8--0 = Pll div = 0x1e
#byte CLKDIV = 0x744 // bits 7--6 = Pll post = 0 // bits 4--0 = Pll Pre = 0
#byte OSCCONH = 0x742
#byte OSCCONL = 0x743
//
// Pin definitions
#define Led Pin_A0
#define Buzzer Pin_G13
#define Led2 Pin_E4
#define URst Pin_B12
#define URts Pin_F13
//
//**********************************************************************************
//
main()
{
// SWITCH CLOCK (for 10Mhz Xtal)
#asm
; 10 Mhz xtl example - modify PLLPRE and PLLPOST values
;Place the New Oscillator Selection (NOSC=0b011) in W0
MOV #0x13,W0
;OSCCONH (high byte) Unlock Sequence
MOV #0x743, W1 ; OSCCONH = 742
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 #0x742, W1 ; OSCCONL = 743
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]
;wait:
; BTSC #0x743, #0 ; OSCCON = 742
; BRA wait
;
#endasm
delay_ms(5);
RESTART_WDT();
SETUP_ADC_PORTS(No_Analogs);
SET_TRIS_A(0xffca); // 1111 1111 1100 1010
SET_TRIS_B(0xeffb); // 1110 1111 1111 1011
SET_TRIS_C(0x9fff); // 1001 1111 1111 1111
SET_TRIS_D(0x003e); // 0000 0000 0011 1110 //
SET_TRIS_E(0xe7); // 0000 0111 //
SET_TRIS_F(0xde57); // 1101 1110 0101 0111 //
SET_TRIS_G(0x8ff8); // 1000 1111 1111 1000
Output_A(0x0000);
Output_B(0x0000);
Output_C(0x0000);
Output_D(0x0000);
Output_E(0x00);
Output_F(0x0000);
Output_G(0x0000);
fprintf(RS232, "Hello World");
//
while (TRUE)
{
RESTART_WDT(); // reset watchdog
Output_Low(Led2);
delay_ms(300);
Output_High(Led2);
delay_ms(300);
fprintf(RS232, "Hello World");
Output_Low(Led);
delay_ms(400);
}
}
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Thanks!
ok, I programmed the bootloader with the following Config flags:
; FNOSC: internal fast RC
; IESO: start with user select osc
; POSCMD: XT Osc mode
; FCKSM: clock switching is enabled. monitor disabled
the above code now works fine, switches to 80Mhz clock after bootloading |
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ae6zw
Joined: 25 Oct 2011
Posts: 1
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| PIC24F16KA102 // setup_oscillator( ) |
| Posted: Thu Jan 05, 2012 3:21 pm |
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I also had a problem with setup_oscillator( ) function with PIC24F16KA102
so I wrote my own version of setup_oscillator2( )
which works well, except secondary OSC
| Code: |
void setup_oscillator2( UI16 ui16_OSCCON_01, UI8 ui8_CLK_DIV )
{
UI8 ui8_temp_01, ui8_temp_02, ui8_temp_03, ui8_temp_04;
ui8_temp_01 = ( UI8 ) ( ui16_OSCCON_01 / 0x0100 ); // higher byte
ui8_temp_02 = ( UI8 ) ( ui16_OSCCON_01 & 0x00ff ); // lower byte
ui8_temp_03 = ( ui8_CLK_DIV );
#ASM
;OSCCON (high byte) Unlock Sequence
MOV.B ui8_temp_01, W0
MOV #0x743, W1
MOV #0x78, W2
MOV #0x9A, W3
MOV.B W2, [ W1 ]
MOV.B W3, [ W1 ]
MOV.B W0, [ W1 ]
;OSCCON (low byte) Unlock Sequence Start oscillator switch operation
MOV.B ui8_temp_02, W0
MOV #0x742, W1
MOV #0x46, W2
MOV #0x57, W3
MOV.B W2, [ W1 ]
MOV.B W3, [ W1 ]
MOV.B W0, [ W1 ]
//BSET 0x742, #0 ;OSWEN
;CLKDIV ( high byte )
MOV #0x745, W1
MOV.B ui8_temp_03, W0
MOV.B W0, [ W1 ]
#ENDASM
} // void setup_oscillator2( UI16 ui16_input_01 )
void setup_clk( UI8 ui8_clk )
{
// 0 -- 32K internal // 1 -- 32k secondary OSC // 2 -- 500k Internal //
ui8g_clk_freq = ui8_clk;
switch ( ui8g_clk_freq )
{
//
case 0:
setup_oscillator2( 0x0501, 0x00 ); // 32khz LPRC, 17 uA
//setup_oscillator( OSC_INTERNAL, 32000 ); // if 31000 draw 77 uA, 32000 draw 15 uA ???
break;
case 1:
//setup_oscillator( OSC_INTERNAL, 31000 ); // if 31000 draw 77 uA, 32000 draw 15 uA ???
setup_oscillator2( 0x0401, 0x00 ); // 32khz secondary osc
break;
case 2:
setup_oscillator2( 0x0601, 0x00 ); // 500 kHz , 258 uA
//setup_oscillator( OSC_INTERNAL, 500000 ); //
break;
case 3:
setup_oscillator2( 0x0701, 0x03 ); // 8 MHz div 8 = 1 MHz , 568 uA
//setup_oscillator( OSC_INTERNAL, 1000000 ); //
break;
case 4:
setup_oscillator2( 0x0701, 0x02 ); // 8 MHz div 4 = 2 MHz , 880 uA
//setup_oscillator( OSC_INTERNAL, 1000000 ); //
break;
case 5:
setup_oscillator2( 0x0701, 0x01 ); // 8 MHz div 2 = 4 MHz , 1.50 mA
//setup_oscillator( OSC_INTERNAL, 1000000 ); //
break;
case 6:
setup_oscillator2( 0x0701, 0x00 ); // 8 MHz div 1 = 8 MHz, 2.66 mA
//setup_oscillator( OSC_INTERNAL, 1000000 ); //
break;
} // switch ( ui8_clk_01 )
} // void setup_clk( )
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