mirror of https://github.com/parasyte/alt64
161 lines
2.7 KiB
C
161 lines
2.7 KiB
C
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#include "types.h"
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#include "everdrive.h"
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#include "sys.h"
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u8 spi_dma;
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#include "errors.h"
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#include "mem.h"
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u8 memSpiReadDma(void *dst, u16 slen);
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u8 memSpiReadPio(void *dst, u16 slen);
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u8 mem_buff[512];
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void memSpiSetDma(u8 mode) {
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spi_dma = mode;
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}
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void memcopy(void *src, void *dst, u16 len) {
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u8 *s = (u8 *) src;
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u8 *d = (u8 *) dst;
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while (len--)*d++ = *s++;
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}
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void memfill(void *dst, u8 val, u16 len) {
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u8 *d = (u8 *) dst;
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while (len--)*d++ = val;
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}
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// buff len
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u8 memSpiRead(void *dst, u16 slen) {
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u8 copy_to_rom = 0;
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u32 addr = (u32) dst; //if ROM_ADDR 0xb0000000
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if (addr >= ROM_ADDR && addr < ROM_END_ADDR)copy_to_rom = 1;
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//if (copy_to_rom || spi_dma) {
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if ((copy_to_rom || spi_dma) && addr % 4 == 0) {
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return memSpiReadDma(dst, slen);
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} else {
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return memSpiReadPio(dst, slen);
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}
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}
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u8 memSpiReadPio(void *dst, u16 slen) {
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u16 i;
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u16 u;
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u8 *ptr8 = (u8 *) dst;
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for (i = 0; i < slen; i++) {
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evd_SDdatReadMode(1);
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for (u = 0; u < 65535; u++)if ((evd_SPI(0xff) & 0xf1) == 0xf0)break;
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evd_SDdatReadMode(0);
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if (u == 65535) {
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evd_spiSSOff();
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return DISK_RD_FE_TOUT;
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}
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for (u = 0; u < 512; u++)*ptr8++ = evd_SPI(0xff);
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u = evd_isSDMode() ? 8 : 2;
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while (u--) {
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// console_printf("XRC: %02X", evd_SPI(0xff));
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//console_printf("%02X\n", evd_SPI(0xff));
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u--;
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evd_SPI(0xff);
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evd_SPI(0xff);
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}
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//evd_SPI(0xff);
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//evd_SPI(0xff);
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}
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return 0;
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}
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u8 memSpiReadDma(void *dst, u16 slen) {
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u8 resp = 0;
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u8 copy_to_rom = 0;
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u32 addr = (u32) dst;
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evd_SDdatReadMode(0);
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// console_printf("dma\n");
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if (addr >= ROM_ADDR && addr < ROM_END_ADDR)copy_to_rom = 1;
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if (copy_to_rom) {
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return evd_mmcReadToCart(addr, slen);
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} else {
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resp = evd_mmcReadToCart(0, slen);
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dma_read_s(dst, ROM_ADDR, slen * 512);
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}
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return resp;
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}
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u8 memSpiWrite(void *src) {
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u16 i;
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u8 *ptr8 = (u8 *) src;
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if ((u32) src >= ROM_ADDR && (u32) src < ROM_END_ADDR) {
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dma_read_s(mem_buff, (u32) src, 512);
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for (i = 0; i < 512; i++)mem_spi(mem_buff[i]);
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} else {
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for (i = 0; i < 512; i++)mem_spi(*ptr8++);
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}
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return 0;
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}
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void memSpiBusy() {
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while (evd_isSpiBusy());
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}
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void memRomWrite32(u32 addr, u32 val) {
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vu32 *ptr = (u32 *) (addr + ROM_ADDR);
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vu8 tmp;
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tmp = *ptr;
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*ptr = val;
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tmp = *ptr;
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}
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u32 memRomRead32(u32 addr) {
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vu32 *ptr = (u32 *) (addr + ROM_ADDR);
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vu8 tmp;
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vu32 val;
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tmp = *ptr;
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val = *ptr;
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return val;
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}
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/*
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u8 mem_spi(u8 dat) {
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return evd_SPI(dat);
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}
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*/
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