+++ /dev/null
-/*! \file dspic33f.c
-
- \author Scott Livingston
-
- \brief dsPIC33F programmer application for the GoodFET. Structure
- and style is somewhat modeled after avr.c
-
- \date March-May 2010
-*/
-
-
-#include "apps.h"
-#include "platform.h"
-#include "command.h"
-
-#include "dspic33f.h"
-
-
-void pic33f_setup()
-{
- // Initialize pins; do NOT begin transaction.
- P5DIR |= PGC|MCLR;
- P5REN &= ~(PGC|PGD|MCLR);
- DIR_PGD_WR; // Initially PGD in write mode
-
- SET_MCLR;
- CLR_PGC;
- CLR_PGD;
-
- prep_timer(); // What better time than now?
-}
-
-
-//! Handle a PIC command; currently assumes dsPIC33F/PIC24H
-void pichandle( unsigned char app,
- unsigned char verb,
- unsigned long len )
-{
- unsigned int nb; // Number of bytes
- unsigned int highb, loww; // Used for ICSP commands
-
- switch (verb) {
-
- case PIC_DEVID33F:
- nb = pic33f_getid();
- txdata(app,verb,nb);
- break;
-
- case PIC_SIX33F:
- loww = *cmddata;
- loww |= (*(cmddata+1)) << 8;
- highb = *(cmddata+2);
- pic33f_six( highb, loww );
- txdata(app,verb,0);
- break;
-
- case PIC_SIXLIST33F:
- pic33f_sixlist( len ); // Reply to host is handled by pic33f_sixlist.
- break;
-
- case PIC_REGOUT33F:
- loww = pic33f_regout();
- *cmddata = loww & 0xff;
- *(cmddata+1) = loww >> 8;
- txdata(app,verb,2);
- break;
-
- case PIC_RESET33F:
- CLR_MCLR;
- delay_ms(20);
- SET_MCLR;
- break;
-
- case PIC_START33F:
- pic33f_connect();
- txdata(app,verb,0);
- break;
-
- case PIC_STOP33F:
- pic33f_disconnect();
- txdata(app,verb,0);
- break;
-
- default:
- debugstr( "Verb unimplemented in PIC application." );
- txdata(app,NOK,0);
- break;
-
- }
-}
-
-
-void pic33f_trans8( unsigned char byte )
-{
- /* We only twiddle the PGD and PGC lines.
- MCLR is assumed to be in the correct state. */
- unsigned int i;
-
- DIR_PGD_WR; // Write mode
- i = 1;
- while (i & 0xff) {
- if (byte & i) {
- SET_PGD;
- } else {
- CLR_PGD;
- }
- delay_ticks(10);
- SET_PGC;
- delay_ticks(10);
-
- CLR_PGC;
- delay_ticks(10);
- i = i << 1;
- }
- CLR_PGD;
- DIR_PGD_RD; // Read mode
-}
-
-void pic33f_trans16( unsigned int word )
-{
- pic33f_trans8( word & 0xff );
- pic33f_trans8( word >> 8 );
-}
-
-
-void pic33f_six( unsigned int highb, unsigned int loww )
-{
- /* dsPIC33F/PIC24H instructions have width 24 bits, so we use the
- lower 8 bits of highb and (all 16 bits of) loww to form the
- instruction.
-
- Shift in the instruction. Note that it does not execute until
- the next 4 clock cycles (which also corresponds to a command
- receipt time). */
- unsigned int i;
- DIR_PGD_WR;
- CLR_PGD;
- CLR_PGC;
- for (i = 0; i < 4; i++) {
- SET_PGC;
- delay_ticks(10);
- CLR_PGC;
- delay_ticks(10);
- }
- pic33f_trans16( loww );
- pic33f_trans8( highb );
- DIR_PGD_RD;
-}
-
-
-unsigned int pic33f_regout()
-{
- unsigned int i;
- unsigned int result = 0x0000;
-
- DIR_PGD_WR;
-
- // Shift in command (REGOUT: 0001b).
- SET_PGD;
- delay_ticks(10);
- SET_PGC;
- delay_ticks(10);
- CLR_PGC;
- delay_ticks(10);
-
- CLR_PGD;
- delay_ticks(10);
- for (i = 0; i < 3; i++) {
- SET_PGC;
- delay_ticks(10);
- CLR_PGC;
- delay_ticks(10);
- }
-
- // Pump clock for 8 cycles, and switch PGD direction to read.
- for (i = 0; i < 7; i++) {
- SET_PGC;
- delay_ticks(10);
- CLR_PGC;
- delay_ticks(10);
- }
- DIR_PGD_RD;
-
- /* Now read VISI register (LSb first, as usual).
- Note that when reading from attached device, data is valid (to
- be read) on falling clock edges. */
- for (i = 0; i < 16; i++) {
- SET_PGC;
- delay_ticks(10);
- CLR_PGC;
- result |= READ_PGD << i;
- delay_ticks(10);
- }
-
- /* One last tick apparently is needed here, at least by the
- dsPIC33FJ128GP708 chip that I am working with. Note that this
- is not in the flash programming specs. */
- SET_PGC;
- delay_ticks(10);
- CLR_PGC;
- delay_ticks(10);
-
- return result;
-}
-
-
-void pic33f_sixlist( unsigned int list_len )
-{
- unsigned int k;
- unsigned int instr_loww;
-
- // Bound to Rx buffer size.
- if (list_len > CMDDATALEN)
- list_len = CMDDATALEN;
-
- // Run each instruction!
- for (k = 0; k < list_len-2; k+=3) {
- instr_loww = *(cmddata+k);
- instr_loww |= (*(cmddata+k+1)) << 8;
- pic33f_six( *(cmddata+k+2), instr_loww );
- }
-
- // Reply with total number of bytes used from Rx buffer.
- txdata( PIC, PIC_SIXLIST33F, k );
-}
-
-
-unsigned int pic33f_getid()
-{
- unsigned int result;
- unsigned int nb = 0;
-
- pic33f_connect();
-
- // Read application ID.
- pic33f_six( 0x04, 0x0200 ); // goto 0x200 (i.e. reset)
- pic33f_six( 0x00, 0x0000 ); // nop
- pic33f_six( 0x20, 0x0800 ); // mov #0x80, W0
- pic33f_six( 0x88, 0x0190 ); // mov W0, TBLPAG
- pic33f_six( 0x20, 0x7F00 ); // mov #0x7F0, W0
- pic33f_six( 0x20, 0x7841 ); // mov #VISI, W1
- pic33f_six( 0x00, 0x0000 ); // nop
- pic33f_six( 0xBA, 0x0890 ); // TBLRDL [W0], [W1]
- pic33f_six( 0x00, 0x0000 ); // nop
- pic33f_six( 0x00, 0x0000 ); // nop
- result = pic33f_regout();
- *cmddata = result & 0xff;
- nb += 1;
-
- // Read DEVID.
- pic33f_six( 0x20, 0x0FF0 ); // mov #0xFF, W0
- pic33f_six( 0x88, 0x0190 ); // mov W0, TBLPAG
- pic33f_six( 0xEB, 0x0000 ); // clr W0
- pic33f_six( 0x00, 0x0000 ); // nop
- pic33f_six( 0xBA, 0x08B0 ); // TBLRDL [W0++], [W1]
- pic33f_six( 0x00, 0x0000 ); // nop
- pic33f_six( 0x00, 0x0000 ); // nop
- result = pic33f_regout();
- *(cmddata+1) = result & 0xff;
- *(cmddata+2) = result >> 8;
- nb += 2;
-
- // Read hardware revision.
- pic33f_six( 0xBA, 0x0890 ); // TBLRDL [W0++], [W1]
- pic33f_six( 0x00, 0x0000 ); // nop
- pic33f_six( 0x00, 0x0000 ); // nop
- result = pic33f_regout();
- *(cmddata+3) = result & 0xff;
- *(cmddata+4) = result >> 8;
- nb += 2;
-
- pic33f_disconnect();
-
- return nb;
-}
-
-
-void pic33f_connect()
-{
- unsigned int key_low;
- unsigned int key_high;
-
- key_low = ICSP_KEY_LOW;
- key_high = ICSP_KEY_HIGH;
-
- pic33f_setup();
-
- CLR_PGC;
- delay_us(1);
-
- CLR_MCLR;
- delay_ms(3);
- SET_MCLR;
- delay_us(200);
- CLR_MCLR;
- delay_us(10);
-
- // Enter ICSP key
- pic33f_trans8( key_low & 0xff );
- key_low = key_low >> 8;
- pic33f_trans8( key_low & 0xff );
- pic33f_trans8( key_high & 0xff );
- key_high = key_high >> 8;
- pic33f_trans8( key_high & 0xff );
-
- delay_us(1);
- SET_MCLR; // ...and pull MCLR pin back up.
- delay_ms(25); // Now wait about 25 ms (required per spec!).
-
- /* The first ICSP command must be a SIX, and further, 9 bits are
- required before the instruction (to be executed), rather than
- the typical 4 bits. Thus, to simplify code, I simply load a nop
- here; hence 33 bits are shifted into the dsPIC33F/PIC24H. */
- DIR_PGD_WR;
- CLR_PGD;
- CLR_PGC;
- for (key_low = 0; key_low < 33; key_low++) {
- SET_PGC;
- delay_us(1);
- CLR_PGC;
- delay_us(1);
- }
- DIR_PGD_RD;
-
-}
-
-
-void pic33f_disconnect()
-{
- DIR_PGD_WR;
- CLR_PGD;
- CLR_PGC;
- delay_ms(10);
- CLR_MCLR;
-}
projects / goodfet / blobdiff