mirror of
https://github.com/hsoft/collapseos.git
synced 2024-12-24 14:38:05 +11:00
Merge branch 'master' into forth
This commit is contained in:
commit
82044454d5
@ -1,5 +1,5 @@
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EXTOBJS = ../../emul.o ../../libz80/libz80.o
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OBJS = acia.o classic.o
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OBJS = acia.o sdc.o classic.o
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TARGET = classic
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.PHONY: all
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@ -13,13 +13,18 @@
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#include <termios.h>
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#include "../../emul.h"
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#include "acia.h"
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#include "sdc.h"
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#define RAMSTART 0x8000
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#define ACIA_CTL_PORT 0x80
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#define ACIA_DATA_PORT 0x81
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#define SDC_CSHIGH 0x06
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#define SDC_CSLOW 0x05
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#define SDC_SPI 0x04
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#define MAX_ROMSIZE 0x2000
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static ACIA acia;
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static SDC sdc;
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static uint8_t iord_acia_ctl()
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{
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@ -41,10 +46,30 @@ static void iowr_acia_data(uint8_t val)
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acia_data_wr(&acia, val);
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}
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static uint8_t iord_sdc_spi()
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{
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return sdc_spi_rd(&sdc);
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}
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static void iowr_sdc_spi(uint8_t val)
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{
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sdc_spi_wr(&sdc, val);
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}
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static void iowr_sdc_cshigh(uint8_t val)
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{
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sdc_cshigh(&sdc);
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}
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static void iowr_sdc_cslow(uint8_t val)
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{
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sdc_cslow(&sdc);
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}
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int main(int argc, char *argv[])
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{
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if (argc != 2) {
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fprintf(stderr, "Usage: ./classic /path/to/rom\n");
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if (argc < 2) {
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fprintf(stderr, "Usage: ./classic /path/to/rom [sdcard.img]\n");
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return 1;
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}
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FILE *fp = fopen(argv[1], "r");
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@ -81,10 +106,19 @@ int main(int argc, char *argv[])
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}
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acia_init(&acia);
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sdc_init(&sdc);
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if (argc == 3) {
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fprintf(stderr, "Setting up SD card image\n");
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sdc.fp = fopen(argv[2], "r+");
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}
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m->iord[ACIA_CTL_PORT] = iord_acia_ctl;
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m->iord[ACIA_DATA_PORT] = iord_acia_data;
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m->iowr[ACIA_CTL_PORT] = iowr_acia_ctl;
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m->iowr[ACIA_DATA_PORT] = iowr_acia_data;
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m->iord[SDC_SPI] = iord_sdc_spi;
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m->iowr[SDC_SPI] = iowr_sdc_spi;
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m->iowr[SDC_CSHIGH] = iowr_sdc_cshigh;
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m->iowr[SDC_CSLOW] = iowr_sdc_cslow;
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char tosend = 0;
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while (emul_step()) {
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@ -126,5 +160,8 @@ int main(int argc, char *argv[])
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tcsetattr(0, TCSADRAIN, &saved_term);
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emul_printdebug();
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}
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if (sdc.fp) {
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fclose(sdc.fp);
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}
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return 0;
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}
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206
emul/hw/rc2014/sdc.c
Normal file
206
emul/hw/rc2014/sdc.c
Normal file
@ -0,0 +1,206 @@
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#include <stdio.h>
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#include "sdc.h"
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// Add data to crc with polynomial 0x1021
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// https://stackoverflow.com/a/23726131
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static uint16_t crc16(uint16_t crc, uint8_t data)
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{
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uint8_t x = crc >> 8 ^ data;
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x ^= x>>4;
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crc = (crc << 8) ^ ((uint16_t)(x << 12)) ^ ((uint16_t)(x <<5)) ^ ((uint16_t)x);
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return crc;
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}
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void sdc_init(SDC *sdc)
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{
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sdc->selected = false;
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sdc->initstat = 0;
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sdc->recvidx = 0;
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sdc->sendidx = -1;
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sdc->resp = 0xff;
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sdc->fp = NULL;
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sdc->cmd17bytes = -1;
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sdc->cmd24bytes = -2;
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}
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void sdc_cslow(SDC *sdc)
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{
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sdc->selected = true;
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}
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void sdc_cshigh(SDC *sdc)
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{
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sdc->selected = false;
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}
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void sdc_spi_wr(SDC *sdc, uint8_t val)
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{
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if (!sdc->selected) {
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return;
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}
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sdc->resp = 0xff;
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if (sdc->initstat < 8) {
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// not woken yet.
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sdc->initstat++;
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return;
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}
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if (sdc->sendidx >= 0) {
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sdc->resp = sdc->sendbuf[sdc->sendidx++];
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if (sdc->sendidx == 5) {
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sdc->sendidx = -1;
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}
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return;
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}
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if (sdc->cmd17bytes >= 0) {
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if (sdc->fp) {
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sdc->resp = getc(sdc->fp);
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}
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sdc->crc16 = crc16(sdc->crc16, sdc->resp);
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sdc->cmd17bytes++;
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if (sdc->cmd17bytes == 512) {
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sdc->sendbuf[3] = sdc->crc16 >> 8;
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sdc->sendbuf[4] = sdc->crc16 & 0xff;
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sdc->sendidx = 3;
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sdc->cmd17bytes = -1;
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}
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return;
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}
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if (sdc->cmd24bytes == -1) {
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if (val == 0xff) {
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// it's ok to receive idle bytes before the data token.
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return;
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}
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if (val == 0xfe) {
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// data token, good
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sdc->cmd24bytes = 0;
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} else {
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// something is wrong, cancel cmd24
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sdc->cmd24bytes = -2;
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}
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return;
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}
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if (sdc->cmd24bytes >= 0) {
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if (sdc->cmd24bytes < 512) {
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if (sdc->fp) {
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putc(val, sdc->fp);
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}
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sdc->crc16 = crc16(sdc->crc16, val);
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} else if (sdc->cmd24bytes == 512) {
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// CRC MSB
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if (val == (sdc->crc16>>8)) {
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fprintf(stderr, "Good CRC16 MSB\n");
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} else {
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fprintf(stderr, "Bad CRC16 MSB\n");
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}
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} else {
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if (val == (sdc->crc16&0xff)) {
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fprintf(stderr, "Good CRC16 LSB\n");
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} else {
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fprintf(stderr, "Bad CRC16 LSB\n");
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}
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// valid response for CMD24
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sdc->sendbuf[4] = 0x05;
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sdc->sendidx = 4;
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sdc->cmd24bytes = -3;
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}
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sdc->cmd24bytes++;
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return;
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}
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if ((sdc->recvidx == 0) && ((val > 0x7f) || (val < 0x40))) {
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// not a command
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return;
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}
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sdc->recvbuf[sdc->recvidx++] = val;
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if (sdc->recvidx < 6) {
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// incomplete command
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return;
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}
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// Command complete
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val &= 0x3f;
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sdc->recvidx = 0;
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uint8_t *b = sdc->recvbuf;
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uint8_t cmd = b[0] & 0x3f;
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uint16_t arg1 = (b[1] << 8) | b[2];
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uint16_t arg2 = (b[3] << 8) | b[4];
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if (sdc->initstat == 8) {
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// At this stage, we're expecting CMD0
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if (cmd == 0) {
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sdc->initstat++;
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sdc->sendbuf[4] = 0x01;
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sdc->sendidx = 4;
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}
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return;
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}
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if (sdc->initstat == 9) {
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// At this stage, we're expecting CMD8 with 0x1aa arg2
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if ((cmd == 8) && (arg2 == 0x01aa)) {
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sdc->initstat++;
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sdc->sendbuf[0] = 0x01;
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sdc->sendbuf[1] = 0;
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sdc->sendbuf[2] = 0;
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sdc->sendbuf[3] = 0x01;
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sdc->sendbuf[4] = 0xaa;
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sdc->sendidx = 0;
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} else {
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sdc-> initstat = 8;
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}
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return;
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}
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if (sdc->initstat == 10) {
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// At this stage, we're expecting CMD55
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if (cmd == 55) {
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sdc->initstat++;
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sdc->sendbuf[4] = 0x01;
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sdc->sendidx = 4;
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} else {
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sdc->initstat = 8;
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}
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return;
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}
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if (sdc->initstat == 11) {
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// At this stage, we're expecting CMD41
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if ((cmd == 41) && (arg1 == 0x4000)) {
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sdc->initstat++;
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sdc->sendbuf[4] = 0x00;
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sdc->sendidx = 4;
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} else {
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sdc->initstat = 8;
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}
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return;
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}
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// We have a fully initialized card.
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if (cmd == 17) {
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if (sdc->fp) {
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fseek(sdc->fp, arg2*512, SEEK_SET);
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}
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sdc->sendbuf[3] = 0x00;
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// data token
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sdc->sendbuf[4] = 0xfe;
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sdc->sendidx = 3;
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sdc->cmd17bytes = 0;
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sdc->crc16 = 0;
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return;
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}
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if (cmd == 24) {
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fprintf(stderr, "cmd24\n");
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if (sdc->fp) {
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fseek(sdc->fp, arg2*512, SEEK_SET);
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}
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sdc->sendbuf[4] = 0x00;
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sdc->sendidx = 4;
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sdc->cmd24bytes = -1;
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sdc->crc16 = 0;
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return;
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}
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// Simulate success for any unknown command.
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sdc->sendbuf[4] = 0x00;
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sdc->sendidx = 4;
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}
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uint8_t sdc_spi_rd(SDC *sdc)
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{
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if (!sdc->selected) {
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return 0xff;
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}
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return sdc->resp;
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}
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37
emul/hw/rc2014/sdc.h
Normal file
37
emul/hw/rc2014/sdc.h
Normal file
@ -0,0 +1,37 @@
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#include <stdint.h>
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#include <stdbool.h>
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typedef struct {
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bool selected;
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// Initialization status. 0 == not woken 8 == woken 9 == CMD0 received
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// 10 == CMD8 received, 11 == CMD55 received, 12 == CMD41 received (fully
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// initialized).
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unsigned int initstat;
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// We receive commands into this buffer.
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uint8_t recvbuf[6];
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// Where the next SPI byte should be stored in recvbuf.
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unsigned int recvidx;
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// Buffer to the arguments for a response
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uint8_t sendbuf[5];
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// Index of the next byte from sendbuf we should return. If -1, buffer is
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// empty.
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int sendidx;
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// One byte response. When all other response buffers are empty, return
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// this.
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uint8_t resp;
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// File used for contents read/write
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FILE *fp;
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// number of bytes read into the current CMD17. -1 means no CMD17 active.
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int cmd17bytes;
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// number of bytes received for the current CMD24. -2 means no CMD24 active.
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// -1 means we're still waiting for the data token.
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int cmd24bytes;
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// running crc16 during read and write operations.
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uint16_t crc16;
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} SDC;
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void sdc_init(SDC *sdc);
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void sdc_cslow(SDC *sdc);
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void sdc_cshigh(SDC *sdc);
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void sdc_spi_wr(SDC *sdc, uint8_t val);
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uint8_t sdc_spi_rd(SDC *sdc);
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