ARMmbed
/
mbed-os
mirror of https://github.com/ARMmbed/mbed-os.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Merge pull request #43 from ARMmbed/dummy_read 

SPI block read fix
pull/7774/head
Deepika 2017-08-03 13:00:17 -05:00 committed by GitHub
parent 3b85386642 d94cb26883
commit 5abee1e078
1 changed files with 22 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
SDBlockDevice.cpp
View File

@ -147,6 +147,11 @@
#include "mbed_debug.h"
#include <errno.h>
/* Required version: 5.5.4 and above */
#if (MBED_VERSION < MBED_ENCODE_VERSION(5,5,4))
#error "Incompatible mbed-os version detected! Required 5.5.4 and above"
#endif
#define SD_COMMAND_TIMEOUT 5000 /*!< Timeout in ms for response */
#define SD_CMD0_GO_IDLE_STATE_RETRIES 5 /*!< Number of retries for sending CMDO */
#define SD_DBG 0 /*!< 1 - Enable debugging */
@ -656,12 +661,12 @@ uint8_t SDBlockDevice::_cmd_spi(SDBlockDevice::cmdSupported cmd, uint32_t arg) {
// The received byte immediataly following CMD12 is a stuff byte,
// it should be discarded before receive the response of the CMD12.
if (CMD12_STOP_TRANSMISSION == cmd) {
_spi.write(0xFF);
_spi.write(SPI_FILL_CHAR);
}
// Loop for response: Response is sent back within command response time (NCR), 0 to 8 bytes for SDC
for (int i = 0; i < 0x10; i++) {
response = _spi.write(0xFF);
response = _spi.write(SPI_FILL_CHAR);
// Got the response
if (!(response & R1_RESPONSE_RECV)) {
break;
@ -738,10 +743,10 @@ int SDBlockDevice::_cmd(SDBlockDevice::cmdSupported cmd, uint32_t arg, bool isAc
_card_type = SDCARD_V2;
// Note: No break here, need to read rest of the response
case CMD58_READ_OCR: // Response R3
response = (_spi.write(0xFF) << 24);
response |= (_spi.write(0xFF) << 16);
response |= (_spi.write(0xFF) << 8);
response |= _spi.write(0xFF);
response = (_spi.write(SPI_FILL_CHAR) << 24);
response |= (_spi.write(SPI_FILL_CHAR) << 16);
response |= (_spi.write(SPI_FILL_CHAR) << 8);
response |= _spi.write(SPI_FILL_CHAR);
debug_if(_dbg, "R3/R7: 0x%x \n", response);
break;
@ -751,7 +756,7 @@ int SDBlockDevice::_cmd(SDBlockDevice::cmdSupported cmd, uint32_t arg, bool isAc
break;
case ACMD13_SD_STATUS: // Response R2
response = _spi.write(0xFF);
response = _spi.write(SPI_FILL_CHAR);
debug_if(_dbg, "R2: 0x%x \n", response);
break;
@ -821,12 +826,12 @@ int SDBlockDevice::_read_bytes(uint8_t *buffer, uint32_t length) {
// read data
for (uint32_t i = 0; i < length; i++) {
buffer[i] = _spi.write(0xFF);
buffer[i] = _spi.write(SPI_FILL_CHAR);
}
// Read the CRC16 checksum for the data block
crc = (_spi.write(0xFF) << 8);
crc |= _spi.write(0xFF);
crc = (_spi.write(SPI_FILL_CHAR) << 8);
crc |= _spi.write(SPI_FILL_CHAR);
_deselect();
return 0;
@ -848,8 +853,8 @@ int SDBlockDevice::_read(uint8_t *buffer, uint32_t length) {
_spi.write(NULL, 0, (char*)buffer, length);
// Read the CRC16 checksum for the data block
crc = (_spi.write(0xFF) << 8);
crc |= _spi.write(0xFF);
crc = (_spi.write(SPI_FILL_CHAR) << 8);
crc |= _spi.write(SPI_FILL_CHAR);
_deselect();
return 0;
@ -880,7 +885,7 @@ uint8_t SDBlockDevice::_write(const uint8_t *buffer, uint8_t token, uint32_t len
_spi.write(crc);
// check the response token
response = _spi.write(0xFF);
response = _spi.write(SPI_FILL_CHAR);
_deselect();
return (response & SPI_DATA_RESPONSE_MASK);
}
@ -963,7 +968,7 @@ bool SDBlockDevice::_wait_token(uint8_t token) {
_spi_timer.start();
do {
if (token == _spi.write(0xFF)) {
if (token == _spi.write(SPI_FILL_CHAR)) {
_spi_timer.stop();
return true;
}
@ -980,7 +985,7 @@ bool SDBlockDevice::_wait_ready(uint16_t ms) {
_spi_timer.reset();
_spi_timer.start();
do {
response = _spi.write(0xFF);
response = _spi.write(SPI_FILL_CHAR);
if (response == 0xFF) {
_spi_timer.stop();
return true;
@ -994,7 +999,7 @@ bool SDBlockDevice::_wait_ready(uint16_t ms) {
void SDBlockDevice::_spi_wait(uint8_t count)
{
for (uint8_t i = 0; i < count; ++i) {
_spi.write(0xFF);
_spi.write(SPI_FILL_CHAR);
}
}
@ -1003,6 +1008,7 @@ void SDBlockDevice::_spi_init() {
// Set to SCK for initialization, and clock card with cs = 1
_spi.frequency(_init_sck);
_spi.format(8, 0);
_spi.set_default_write_value(SPI_FILL_CHAR);
// Initial 74 cycles required for few cards, before selecting SPI mode
_cs = 1;
_spi_wait(10);