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quickdev16/avr/usbload/shared_memory.c
optixx f5cdf71fb1 cleanup shared mem code
2009-09-20 09:38:56 +02:00

345 lines
9.9 KiB
C
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/*
* =====================================================================================
*
* ________ .__ __ ________ ____ ________
* \_____ \ __ __|__| ____ | | __\______ \ _______ _/_ |/ _____/
* / / \ \| | \ |/ ___\| |/ / | | \_/ __ \ \/ /| / __ \
* / \_/. \ | / \ \___| < | ` \ ___/\ / | \ |__\ \
* \_____\ \_/____/|__|\___ >__|_ \/_______ /\___ >\_/ |___|\_____ /
* \__> \/ \/ \/ \/ \/
*
* www.optixx.org
*
*
* Version: 1.0
* Created: 07/21/2009 03:32:16 PM
* Author: david@optixx.org
*
* =====================================================================================
*/
#include <stdlib.h>
#include <stdint.h>
#include <util/delay.h>
#include "shared_memory.h"
#include "config.h"
#include "sram.h"
#include "debug.h"
#include "dump.h"
#include "info.h"
#include "crc.h"
uint8_t irq_addr_lo;
uint8_t irq_addr_hi;
uint8_t scratchpad_state;
uint8_t scratchpad_cmd;
uint8_t scratchpad_payload;
uint8_t scratchpad_region_rx[SHARED_MEM_RX_LOC_SIZE];
uint8_t scratchpad_region_tx[SHARED_MEM_TX_LOC_SIZE];
uint8_t scratchpad_locked_rx = 1;
uint8_t scratchpad_locked_tx = 1;
void shared_memory_init(void){
scratchpad_locked_rx = 1;
scratchpad_locked_tx = 1;
}
uint8_t shared_memory_scratchpad_region_save_helper(uint32_t addr){
#if DO_SHM_SCRATCHPAD
if(addr > (SHARED_MEM_TX_LOC_STATE + (SHARED_MEM_TX_LOC_SIZE )) && scratchpad_locked_tx){
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_save_helper: open tx addr=0x%06lx\n"),addr);
shared_memory_scratchpad_region_tx_save();
return 0;
}
if(addr > (SHARED_MEM_RX_LOC_STATE + ( SHARED_MEM_RX_LOC_SIZE )) && scratchpad_locked_rx){
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_save_helper: open rx addr=0x%06lx\n"),addr);
shared_memory_scratchpad_region_rx_save();
return 0;
}
#endif
return 1;
}
void shared_memory_scratchpad_region_tx_save()
{
sram_bulk_addr_save();
#if SHARED_SCRATCHPAD_CRC
uint16_t crc;
crc = crc_check_bulk_memory((uint32_t)SHARED_MEM_TX_LOC_STATE,
(uint32_t)(SHARED_MEM_TX_LOC_STATE + SHARED_MEM_TX_LOC_SIZE), 0x8000);
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_tx_save: crc=%x\n"),crc);
#endif
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_tx_save: unlock\n"));
sram_bulk_copy_into_buffer((uint32_t)SHARED_MEM_TX_LOC_STATE,scratchpad_region_tx,
(uint32_t)SHARED_MEM_TX_LOC_SIZE);
scratchpad_locked_tx = 0;
#if SHARED_SCRATCHPAD_CRC
do_crc_update(0, scratchpad_region_tx,SHARED_MEM_TX_LOC_SIZE);
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_tx_save: crc=%x\n"),crc);
#endif
#if SHARED_SCRATCHPAD_DUMP
dump_packet(SHARED_MEM_TX_LOC_STATE, SHARED_MEM_TX_LOC_SIZE, scratchpad_region_tx);
dump_memory(SHARED_MEM_TX_LOC_STATE, SHARED_MEM_TX_LOC_STATE + SHARED_MEM_TX_LOC_SIZE);
#endif
sram_bulk_addr_restore();
}
void shared_memory_scratchpad_region_rx_save()
{
sram_bulk_addr_save();
#if SHARED_SCRATCHPAD_CRC
uint16_t crc;
crc = crc_check_bulk_memory((uint32_t)SHARED_MEM_RX_LOC_STATE,
(uint32_t)(SHARED_MEM_RX_LOC_STATE + SHARED_MEM_RX_LOC_SIZE), 0x8000);
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_rx_save: crc=%x\n"),crc);
#endif
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_rx_save: unlock\n"));
sram_bulk_copy_into_buffer((uint32_t)SHARED_MEM_RX_LOC_STATE,scratchpad_region_rx,
(uint32_t)SHARED_MEM_RX_LOC_SIZE);
scratchpad_locked_rx = 0;
#if SHARED_SCRATCHPAD_CRC
do_crc_update(0, scratchpad_region_rx,SHARED_MEM_RX_LOC_SIZE);
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_rx_save: crc=%x\n"),crc);
#endif
#if SHARED_SCRATCHPAD_DUMP
dump_packet(SHARED_MEM_RX_LOC_STATE, SHARED_MEM_RX_LOC_SIZE, scratchpad_region_rx);
dump_memory(SHARED_MEM_RX_LOC_STATE, SHARED_MEM_RX_LOC_STATE + SHARED_MEM_RX_LOC_SIZE);
#endif
sram_bulk_addr_restore();
}
void shared_memory_scratchpad_region_tx_restore()
{
if (scratchpad_locked_tx)
return;
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_tx_restore: lock\n"));
#if SHARED_SCRATCHPAD_DUMP
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_tx_restore: memory\n"));
dump_memory(SHARED_MEM_TX_LOC_STATE, SHARED_MEM_TX_LOC_STATE + SHARED_MEM_TX_LOC_SIZE);
#endif
sram_bulk_copy_from_buffer((uint32_t)SHARED_MEM_TX_LOC_STATE,scratchpad_region_tx,
(uint32_t)SHARED_MEM_TX_LOC_SIZE);
scratchpad_locked_tx = 1;
#if SHARED_SCRATCHPAD_DUMP
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_tx_restore: buffer\n"));
dump_packet(SHARED_MEM_TX_LOC_STATE, SHARED_MEM_TX_LOC_SIZE, scratchpad_region_tx);
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_tx_restore: memory\n"));
dump_memory(SHARED_MEM_TX_LOC_STATE, SHARED_MEM_TX_LOC_STATE + SHARED_MEM_TX_LOC_SIZE);
#endif
#if SHARED_SCRATCHPAD_CRC
uint16_t crc;
crc = crc_check_bulk_memory((uint32_t)SHARED_MEM_TX_LOC_STATE,
(uint32_t)(SHARED_MEM_TX_LOC_STATE + SHARED_MEM_TX_LOC_SIZE), 0x8000);
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_tx_restore: crc=%x\n"),crc);
#endif
}
void shared_memory_scratchpad_region_rx_restore()
{
if (scratchpad_locked_rx)
return;
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_rx_restore: lock\n"));
#if SHARED_SCRATCHPAD_DUMP
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_rx_restore: memory\n"));
dump_memory(SHARED_MEM_RX_LOC_STATE - 0x10, SHARED_MEM_RX_LOC_STATE + SHARED_MEM_RX_LOC_SIZE);
#endif
sram_bulk_copy_from_buffer((uint32_t)SHARED_MEM_RX_LOC_STATE,scratchpad_region_rx,
(uint32_t)SHARED_MEM_RX_LOC_SIZE);
scratchpad_locked_rx = 1;
#if SHARED_SCRATCHPAD_DUMP
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_rx_restore: buffer\n"));
dump_packet(SHARED_MEM_RX_LOC_STATE, SHARED_MEM_RX_LOC_SIZE, scratchpad_region_rx);
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_rx_restore: memory\n"));
dump_memory(SHARED_MEM_RX_LOC_STATE - 0x10, SHARED_MEM_RX_LOC_STATE + SHARED_MEM_RX_LOC_SIZE);
#endif
#if SHARED_SCRATCHPAD_CRC
uint16_t crc;
crc = crc_check_bulk_memory((uint32_t)SHARED_MEM_RX_LOC_STATE,
(uint32_t)(SHARED_MEM_RX_LOC_STATE + SHARED_MEM_RX_LOC_SIZE), 0x8000);
debug_P(DEBUG_SHM, PSTR("shared_memory_scratchpad_region_rx_restore: crc=%x\n"),crc);
#endif
}
void shared_memory_scratchpad_tx_save()
{
scratchpad_state = sram_read(SHARED_MEM_TX_LOC_STATE);
scratchpad_cmd = sram_read(SHARED_MEM_TX_LOC_CMD);
scratchpad_payload = sram_read(SHARED_MEM_TX_LOC_PAYLOAD);
}
void shared_memory_scratchpad_tx_restore()
{
sram_write(SHARED_MEM_TX_LOC_STATE, scratchpad_state);
sram_write(SHARED_MEM_TX_LOC_CMD, scratchpad_cmd);
sram_write(SHARED_MEM_TX_LOC_PAYLOAD, scratchpad_payload);
}
void shared_memory_irq_hook()
{
irq_addr_lo = sram_read(SHARED_IRQ_LOC_LO);
irq_addr_hi = sram_read(SHARED_IRQ_LOC_HI);
sram_write(SHARED_IRQ_HANDLER_LO, 0);
sram_write(SHARED_IRQ_HANDLER_HI, 0);
}
void shared_memory_irq_restore()
{
sram_write(SHARED_IRQ_LOC_LO, irq_addr_lo);
sram_write(SHARED_IRQ_LOC_HI, irq_addr_hi);
}
void shared_memory_write(uint8_t cmd, uint8_t value)
{
#if DO_SHM
#if DO_SHM_SCRATCHPAD
if (scratchpad_locked_tx){
debug_P(DEBUG_SHM, PSTR("shared_memory_write: locked_tx\n"));
//return 1;
}
#endif
debug_P(DEBUG_SHM, PSTR("shared_memory_write: 0x%04x=0x%02x 0x%04x=0x%02x \n"),
SHARED_MEM_TX_LOC_CMD, cmd, SHARED_MEM_TX_LOC_PAYLOAD, value);
sram_bulk_addr_save();
#if (DO_SHM_SCRATCHPAD==0)
shared_memory_scratchpad_tx_save();
#endif
#if SHARED_MEM_SWITCH_IRQ
shared_memory_irq_hook();
#endif
sram_write(SHARED_MEM_TX_LOC_STATE, SHARED_MEM_TX_SNES_ACK);
sram_write(SHARED_MEM_TX_LOC_CMD, cmd);
sram_write(SHARED_MEM_TX_LOC_PAYLOAD, value);
snes_hirom();
snes_wr_disable();
snes_bus_active();
#if SHARED_MEM_SWITCH_IRQ
snes_irq_on();
snes_irq_lo();
_delay_us(20);
snes_irq_hi();
snes_irq_off();
#else
_delay_ms(SHARED_MEM_SWITCH_DELAY);
#endif
avr_bus_active();
snes_irq_lo();
snes_irq_off();
snes_lorom();
snes_wr_disable();
#if (DO_SHM_SCRATCHPAD==0)
shared_memory_scratchpad_tx_restore();
#endif
#if SHARED_MEM_SWITCH_IRQ
shared_memory_irq_restore();
#endif
sram_bulk_addr_restore();
#endif
}
void shared_memory_yield()
{
snes_hirom();
snes_wr_disable();
snes_bus_active();
_delay_ms(SHARED_MEM_SWITCH_DELAY);
avr_bus_active();
snes_lorom();
snes_wr_disable();
}
int shared_memory_read(uint8_t *cmd, uint8_t *len,uint8_t *buffer)
{
uint8_t state;
#if DO_SHM
#if DO_SHM_SCRATCHPAD
if (scratchpad_locked_rx){
debug_P(DEBUG_SHM, PSTR("shared_memory_write: locked_tx\n"));
return 1;
}
#endif
sram_bulk_addr_save();
state = sram_read(SHARED_MEM_RX_LOC_STATE);
if (state != SHARED_MEM_RX_AVR_ACK){
sram_bulk_addr_restore();
return 1;
}
*cmd = sram_read(SHARED_MEM_RX_LOC_CMD);
*len = sram_read(SHARED_MEM_RX_LOC_LEN);
debug_P(DEBUG_SHM, PSTR("shared_memory_read: 0x%04x=0x%02x 0x%04x=0x%02x \n"),
SHARED_MEM_RX_LOC_CMD, *cmd, SHARED_MEM_RX_LOC_LEN, *len);
sram_bulk_copy_into_buffer(SHARED_MEM_RX_LOC_PAYLOAD,buffer, *len);
sram_write(SHARED_MEM_RX_LOC_STATE, SHARED_MEM_RX_AVR_RTS);
snes_hirom();
snes_wr_disable();
snes_bus_active();
#if SHARED_MEM_SWITCH_IRQ
snes_irq_on();
snes_irq_lo();
_delay_us(20);
snes_irq_hi();
snes_irq_off();
#else
_delay_ms(SHARED_MEM_SWITCH_DELAY);
#endif
avr_bus_active();
snes_lorom();
snes_wr_disable();
sram_bulk_addr_restore();
#endif
return 0;
}
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