Changeset 382f714 in rtems for c/src/libchip

Timestamp:

Oct 8, 2013, 8:40:29 AM (7 years ago)

Author:

Pavel Pisa <ppisa@…>

Branches:

4.11, 5, master

Children:

fee154be

Parents:

5ceefe1

git-author:

Pavel Pisa <ppisa@…> (10/08/13 08:40:29)

git-committer:

Sebastian Huber <sebastian.huber@…> (10/08/13 09:14:03)

Message:

SPI SD-Card: setup valid CRC-7 for STOP_TRANSMISSION command.

STOP_TRANSMISSION command is used to finish READ_MULTIPLE_BLOCK
command and its format is regular command format.
It requires valid CRC-7 to have effect at least on
same cards types else it is ignored and attempt
to issue next READ or WRITE commands results in
illegal command condition (0x04) preceded by strange
(0x3f) for tested card.

Signed-off-by: Pavel Pisa <ppisa@…>

File:

• c/src/libchip/i2c/spi-sd-card.c (modified) (1 diff)

c/src/libchip/i2c/spi-sd-card.c

@@ -502 +502 @@
 {
         int rv = 0;
+        uint8_t crc7;
 
         SD_CARD_COMMAND_SET_COMMAND( e->command, SD_CARD_CMD_STOP_TRANSMISSION);
+        SD_CARD_COMMAND_SET_ARGUMENT( e->command, 0);
+        /*crc7 = sd_card_compute_crc7( e->command + 1, 5);*/
+        crc7 = 0x30;    /* Help compiler - command and argument are constants */
+        SD_CARD_COMMAND_SET_CRC7( e->command, crc7);
         rv = rtems_libi2c_write_bytes( e->bus, e->command, SD_CARD_COMMAND_SIZE);
         RTEMS_CHECK_RV( rv, "Write stop transfer token");