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Provide PDATA cache for avr910_read_byte_flash()

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This commit is contained in:
Stefan Rueger
2024-04-18 20:31:49 +01:00
parent 9ed9053671
commit 45b4f7ab09
1 changed files with 16 additions and 3 deletions
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19
src/avr910.c
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@@ -50,6 +50,10 @@ struct pdata
unsigned int buffersize;
unsigned char test_blockmode;
unsigned char use_blockmode;
int ctype; // Cache one byte for flash
unsigned char cvalue;
unsigned long caddr;
};
#define PDATA(pgm) ((struct pdata *)(pgm->cookie))
@@ -275,9 +279,6 @@ static void avr910_disable(const PROGRAMMER *pgm) {
static void avr910_enable(PROGRAMMER *pgm, const AVRPART *p) {
/* Do nothing. */
return;
}
@@ -408,6 +409,7 @@ static int avr910_write_byte(const PROGRAMMER *pgm, const AVRPART *p, const AVRM
}
addr >>= 1;
PDATA(pgm)->ctype = 0; // Invalidate read cache
}
else if (mem_is_eeprom(m)) {
cmd[0] = 'D';
@@ -432,11 +434,20 @@ static int avr910_read_byte_flash(const PROGRAMMER *pgm, const AVRPART *p, const
{
char buf[2];
if(PDATA(pgm)->ctype == 'F' && PDATA(pgm)->caddr == addr) {
*value = PDATA(pgm)->cvalue;
return 0;
}
avr910_set_addr(pgm, addr >> 1);
EI(avr910_send(pgm, "R", 1));
EI(avr910_recv(pgm, buf, sizeof(buf)));
*value = buf[(addr & 1) ^ 1]; // MSB in buffer first
PDATA(pgm)->ctype = 'F';
PDATA(pgm)->cvalue = buf[addr & 1];
PDATA(pgm)->caddr = addr ^ 1;
return 0;
}
@@ -479,6 +490,8 @@ static int avr910_paged_write_flash(const PROGRAMMER *pgm, const AVRPART *p, con
int page_bytes = page_size;
int page_wr_cmd_pending = 0;
PDATA(pgm)->ctype = 0; // Invalidate read cache
page_addr = addr;
avr910_set_addr(pgm, addr>>1);