Matthias Blankertz
0bc4815926
- Debugged UART - Firmware support for SPI, UART - Work on SD/MMC support in firmware - Debugged mblite core/WB interface
93 lines
1.7 KiB
C
93 lines
1.7 KiB
C
// Copyright (c) 2013 Matthias Blankertz <matthias@blankertz.org>
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#include <stdbool.h>
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#include "spi.h"
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#include "sd.h"
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#include "util.h"
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bool sd_por() {
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// Send '1' for 80 cycles
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spi_set_ss(true);
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for(int i = 0;i < 10;++i)
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spi_xmit(0xff);
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spi_set_ss(false);
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return true;
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}
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unsigned char sd_cmd(unsigned char cmd, unsigned param) {
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spi_xmit(0x40 | cmd);
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spi_xmit(param>>24);
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spi_xmit(param>>16);
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spi_xmit(param>>8);
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spi_xmit(param&0xff);
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spi_xmit(cmd==0?0x95:(cmd==41?0xe5:0x01));
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unsigned char tmp;
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int i = 0;
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while(((tmp=spi_xmit(0xff))&0x80) && (i++<=8)) {
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}
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const char *s = utox(tmp);
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uart_writes("0x");
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uart_writes(s);
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uart_writeb(' ');
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return tmp;
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}
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unsigned char sd_acmd(unsigned char cmd, unsigned param) {
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spi_xmit(0x77);
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/* spi_xmit(0x00); */
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/* spi_xmit(0x00); */
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/* spi_xmit(0x00); */
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/* spi_xmit(0x00); */
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/* spi_xmit(0x95); */
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spi_xmit(0x40 | cmd);
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spi_xmit(param>>24);
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spi_xmit(param>>16);
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spi_xmit(param>>8);
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spi_xmit(param&0xff);
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spi_xmit(0x95);
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unsigned char tmp;
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int i = 0;
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while(((tmp=spi_xmit(0xff))&0x80) && (i++<=8)) {
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}
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const char *s = utox(tmp);
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uart_writes("0x");
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uart_writes(s);
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uart_writeb(' ');
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return tmp;
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}
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unsigned char sd_cmd_r7(unsigned char cmd, unsigned param, unsigned *resp) {
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spi_xmit(0x40 | cmd);
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spi_xmit(param>>24);
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spi_xmit(param>>16);
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spi_xmit(param>>8);
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spi_xmit(param&0xff);
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spi_xmit(0x95);
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unsigned char tmp;
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int i = 0;
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while(((tmp=spi_xmit(0xff))&0x80) && (i++<=8)) {
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}
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const char *s = utox(tmp);
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uart_writes("0x");
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uart_writes(s);
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uart_writeb(' ');
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if(tmp != 0xff) {
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*resp = 0;
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for(int i = 0;i < 4;++i) {
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*resp <<= 8;
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*resp |= spi_xmit(0xff);
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}
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}
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return tmp;
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}
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