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Implement usbasp_tpi_write_byte() as draft

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This commit is contained in:
Stefan Rueger
2024-04-19 18:03:13 +01:00
parent 68ade64f46
commit fd0838b395
1 changed files with 73 additions and 6 deletions
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79
src/usbasp.c
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@@ -1195,7 +1195,7 @@ static int usbasp_tpi_paged_load(const PROGRAMMER *pgm, const AVRPART *p, const
return n_bytes;
}
static int usbasp_tpi_paged_write(const PROGRAMMER *pgm, const AVRPART *p, const AVRMEM *m,
int usbasp_tpi_paged_write(const PROGRAMMER *pgm, const AVRPART *p, const AVRMEM *m,
unsigned int page_size, unsigned int addr, unsigned int n_bytes) {
unsigned char cmd[4];
@@ -1269,7 +1269,6 @@ static int usbasp_tpi_read_byte(const PROGRAMMER * pgm, const AVRPART *p, const
int n;
uint16_t pr;
pmsg_debug("usbasp_tpi_read_byte(\"%s\", 0x%0lx)\n", m->desc, addr);
pr = m->offset + addr;
@@ -1289,10 +1288,79 @@ static int usbasp_tpi_read_byte(const PROGRAMMER * pgm, const AVRPART *p, const
}
static int usbasp_tpi_write_byte(const PROGRAMMER *pgm, const AVRPART *p, const AVRMEM *m,
unsigned long addr, unsigned char data) { // FIXME: use avr_write_byte_cache() when implemented
unsigned long addr, unsigned char data) {
pmsg_debug("%s(\"%s\", 0x%0lx, 0x%02x)\n", __func__, m->desc, addr, data);
pmsg_error("usbasp_write_byte in TPI mode; all writes have to be done at page level\n");
return -1;
if(mem_is_flash(m)) {
pmsg_error("cannot write_byte() to %s; use paged_write()\n", m->desc);
return -1;
}
// Memories left: fuse and lockbits
unsigned char cmd[4], sbuf[32] = {0}, *sptr = sbuf;
int written, clen, n, n_bytes = m->page_size;
uint16_t pr;
if(addr != 0) {
pmsg_error("unexpected address 0x%04lx of %s memory\n", addr, m->desc);
return -1;
}
if(n_bytes > (int) sizeof sbuf) {
pmsg_error("unexpected page size %d of %s memory\n", n_bytes, m->desc);
return -1;
}
*sbuf = *m->buf;
pr = addr + m->offset;
written = 0;
// Must erase fuse first, TPI parts only have one fuse
if(mem_is_a_fuse(m)) { // What about lockbits? Should this if be removed?
// Set PR
usbasp_tpi_send_byte(pgm, TPI_OP_SSTPR(0));
usbasp_tpi_send_byte(pgm, (pr & 0xFF) | 1 );
usbasp_tpi_send_byte(pgm, TPI_OP_SSTPR(1));
usbasp_tpi_send_byte(pgm, (pr >> 8) );
// Select SECTION_ERASE
usbasp_tpi_send_byte(pgm, TPI_OP_SOUT(NVMCMD));
usbasp_tpi_send_byte(pgm, NVMCMD_SECTION_ERASE);
// Dummy write
usbasp_tpi_send_byte(pgm, TPI_OP_SST_INC);
usbasp_tpi_send_byte(pgm, 0x00);
usbasp_tpi_nvm_waitbusy(pgm);
}
// Set PR
usbasp_tpi_send_byte(pgm, TPI_OP_SSTPR(0));
usbasp_tpi_send_byte(pgm, (pr & 0xFF) | 1 );
usbasp_tpi_send_byte(pgm, TPI_OP_SSTPR(1));
usbasp_tpi_send_byte(pgm, (pr >> 8) );
while(written < n_bytes) {
clen = n_bytes - written;
if(clen > 32)
clen = 32;
cmd[0] = pr & 0xFF;
cmd[1] = pr >> 8;
cmd[2] = 0;
cmd[3] = 0;
n = usbasp_transmit(pgm, 0, USBASP_FUNC_TPI_WRITEBLOCK, cmd, sptr, clen);
if(n != clen) {
if(n >= 0)
pmsg_error("wrong count at writing %x\n", n);
return -3;
}
written += clen;
pr += clen;
sptr += clen;
}
return 0;
}
@@ -1346,4 +1414,3 @@ void usbasp_initpgm(PROGRAMMER *pgm) {
#endif /* HAVE_LIBUSB */
const char usbasp_desc[] = "USBasp programmer, see http://www.fischl.de/usbasp/";