SD CARD

SD/MMC-Card Reader
Status	Stable
menuconfig	I/O->SD/MMC-Card Reader
Pinning	yes
Ecmd	yes
Control6	yes
Depends on	ECMD
Code	https://github.com/ethersex/ethersex/tree/master/hardware/storage/sd_reader

The module is based on Roland Riegel's MMC/SD/SDHC card library complemented by the connection to the Ethersex Virtual File System.

Connection

SD-Card Adapter Schaltung

SD-Card Adapter Aufbau

MicroSD-Card Adapter mit Level-Shifter aus China

Configuration

 | |        I/O  --->                                                    | |
 ...
 │ │        Storage  --->                                                │ │ 
 ...
 | |        [*] SD/MMC-Card Reader  --->                                 | |
 ...
 | |        [ ] SDHC support                                             | |
 | |        [*] VFAT LFN support                                         | |
 | |        [ ] Read-only mode                                           | |
 | |        [*] Use read-timeout                                         | |
 | |        [*] Ping-read SD card every 10s                              | |
 | |        --- ECMD Support                                             | |
 | |        [*] info                                                     | |
 | |        [*] dir                                                      | |
 | |        [*] mkdir                                                    | |
 | |        [*] rm                                                       | |
 | |        --- Debugging Flags                                          | |
 | |        [*] FAT                                                      | |
 | |        [*] RAW                                                      | |
 | |        [*] VFS                                                      | |
   
 | |        General Setup  --->                                          | |
 ...
 | |        [*] VFS (Virtual File System) support  --->                  | |
 ...
 | |             [*] SD/MMC-Card Filesystem                              | |

ECMD

IRMP implements an ECMD interface. See ECMD reference.

Control6

The following example writes the date, time and temperature by VFS_LOG_ALLOCA (VFS_LOG requires UIP) in the file "temp.log" as soon as the temperature has changed by more than a degree to the last measurement. For date and time CLOCK_SUPPORT must be enabled.

#include <stdlib.h>

int16_t Temperatur;
int16_t Temperatur_alt;

CONTROL_START

THREAD(read_temp)
  Temperatur = ONEWIRE_GET(10d85594010800eb);
  ON abs(Temperatur-Temperatur_alt)>10 DO
    uint8_t sign = Temperatur<0;
    div_t res = div(abs(Temperatur),10);
    VFS_LOG_ALLOCA("temp.log", 50, "%2d.%2d.%4d %2d:%02d %S%d.%d", CLOCK_DAY, CLOCK_MONTH, CLOCK_YEAR, CLOCK_HOUR, CLOCK_MIN, sign?PSTR("-"):PSTR(""),res.quot,res.rem)
    Temperatur_alt = Temperatur;
  END
  WAIT(15);
THREAD_END(read_temp)

ON STARTUP DO
  Temperatur = Temperatur_alt = 0;
  THREAD_START(read_temp);
END

CONTROL_END