RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-05 15:27:46 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

integrate SPI EEPROM

Browse source
This commit is contained in:
notaz 2017-09-22 02:00:50 +03:00
parent 8c2137f11f
commit 6a47c2d4fb
4 changed files with 33 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

22
pico/carthw/eeprom_spi.c
View file

@ -36,7 +36,9 @@
*
****************************************************************************************/
#include "shared.h"
#include "../pico_int.h"
#include "../cd/genplus_macros.h"
#include "eeprom_spi.h"
/* max supported size 64KB (25x512/95x512) */
#define SIZE_MASK 0xffff
@ -72,16 +74,16 @@ typedef struct
static T_EEPROM_SPI spi_eeprom;
void eeprom_spi_init()
void *eeprom_spi_init(int *size)
{
/* reset eeprom state */
memset(&spi_eeprom, 0, sizeof(T_EEPROM_SPI));
spi_eeprom.out = 1;
spi_eeprom.state = GET_OPCODE;
/* enable backup RAM */
sram.custom = 2;
sram.on = 1;
if (size)
*size = sizeof(T_EEPROM_SPI);
return &spi_eeprom;
}
void eeprom_spi_write(unsigned char data)
@ -208,7 +210,7 @@ void eeprom_spi_write(unsigned char data)
if (spi_eeprom.opcode & 0x01)
{
/* READ operation */
spi_eeprom.buffer = sram.sram[spi_eeprom.addr];
spi_eeprom.buffer = SRam.data[spi_eeprom.addr];
spi_eeprom.state = READ_BYTE;
}
else
@ -264,7 +266,7 @@ void eeprom_spi_write(unsigned char data)
/* $C000-$FFFF (sector #3) is protected */
if (spi_eeprom.addr < 0xC000)
{
sram.sram[spi_eeprom.addr] = spi_eeprom.buffer;
SRam.data[spi_eeprom.addr] = spi_eeprom.buffer;
}
break;
}
@ -274,7 +276,7 @@ void eeprom_spi_write(unsigned char data)
/* $8000-$FFFF (sectors #2 and #3) is protected */
if (spi_eeprom.addr < 0x8000)
{
sram.sram[spi_eeprom.addr] = spi_eeprom.buffer;
SRam.data[spi_eeprom.addr] = spi_eeprom.buffer;
}
break;
}
@ -288,7 +290,7 @@ void eeprom_spi_write(unsigned char data)
default:
{
/* no sectors protected */
sram.sram[spi_eeprom.addr] = spi_eeprom.buffer;
SRam.data[spi_eeprom.addr] = spi_eeprom.buffer;
break;
}
}
@ -330,7 +332,7 @@ void eeprom_spi_write(unsigned char data)
{
/* read next array byte */
spi_eeprom.addr = (spi_eeprom.addr + 1) & SIZE_MASK;
spi_eeprom.buffer = sram.sram[spi_eeprom.addr];
spi_eeprom.buffer = SRam.data[spi_eeprom.addr];
}
}
}