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+--- Thread: Frequency for external Oscillator [solved] (/showthread.php?tid=376)
Frequency for external Oscillator [solved] - BeastyK - 2011-08-15
I want to use the ds30 Loader with my dsPIC30F411.
What kind of changes did I have to do if my external Oscillator is about 20 MHz (its a stupid choice cause I couldn't use the PLL) and I take the alternate UART1 Pins?
Only this one on settings.inc:
Code:
;------------------------------------------------------------------------------
; Device
;------------------------------------------------------------------------------
;.equ __24F16KA102, 1 ;xxx uncomment and change if using PIC24F device
;.equ __24FJ128GA010, 1 ;xxx uncomment and change if using PIC24FJ device
;.equ __24HJ128GP504, 1 ;xxx uncomment and change if using PIC24HJ device
.equ __30F4011, 1 ;xxx uncomment and change if using dsPIC30F device
;.equ __33FJ256GP710, 1 ;xxx uncomment and change if using dsPIC33FJ device
;------------------------------------------------------------------------------
; Includes
;------------------------------------------------------------------------------
.include "devices.inc"
;------------------------------------------------------------------------------
; User preferences
;------------------------------------------------------------------------------
.equiv FCY, 20000000 ;xxx speed of internal cycle clock[Hz], used to calculate uart brg and delay
.equiv BLINIT, 3000 ;xxx hello receive timeout [ms]
.equiv HELLOTRIES, 2 ;xxx number of non hello characters received before branching to the user application
.equiv BLTIME, 3000 ;xxx data receive timeout [ms]
;------------------------------------------------------------------------------
; UART settings
;------------------------------------------------------------------------------
;.equiv USE_UART1, 1 ;xxx uncomment to use uart1
;.equiv USE_UART2, 1 ;xxx uncomment to use uart2
;.equiv USE_UART3, 1 ;xxx uncomment to use uart3
;.equiv USE_UART4, 1 ;xxx uncomment to use uart4
.equ USE_ALTIO, 1 ;xxx uncomment to use uart 1 alternative i/o, only for dsPIC30F
.equiv BAUDRATE, 115200 ;xxx baudrate
;.equiv USE_ABAUD, 1 ;xxx uncomment to use auto baud rate detection, READ ERRATA FIRST
;.equiv USE_BRGH, 1 ;xxx uncomment to use high baud rates, READ ERRATA FIRST, not available for PIC24F
;.equiv USE_TXENABLE, 1 ;xxx uncomment to use a tx enable pin
.ifdef USE_TXENABLE
.equiv TRISR_TXE, TRISA ;xxx tris register containing tx enable
.equiv LATR_TXE, LATA ;xxx port register containing tx enable
.equiv TRISB_TXE, TRISA1 ;xxx tris bit for tx enable
.equiv LATB_TXE, RA1 ;xxx port bit for tx enable
.endifAnd how must look my application (Hexfile)?
Greets
Andi
RE: Frequency for external Oscillator - Mikael Gustavsson - 2011-08-16
Because each instruction is 4 clock cycles you need to set fcy to 5000000
Mikael