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Dataset card Data Studio Files
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procedure Card_Identification_Process
(This : in out SDMMC_Driver'Class;
Info : out Card_Information;
Status : out SD_Error)
is
Rsp : UInt32;
W0, W1, W2, W3 : UInt32;
Rca : UInt32;
begin
-- Reset controller
This.Reset (Status);
if Status /= OK then
return;
end if;
-- CMD0: Sets the SDCard state to Idle
Send_Cmd (This, Go_Idle_State, 0, Status);
if Status /= OK then
return;
end if;
-- CMD8: IF_Cond, voltage supplied: 0x1 (2.7V - 3.6V)
-- It is mandatory for the host compliant to Physical Spec v2.00
-- to send CMD8 before ACMD41
Send_Cmd (This, Send_If_Cond, 16#1a5#, Status);
if Status = OK then
-- at least SD Card 2.0
Info.Card_Type := STD_Capacity_SD_Card_v2_0;
Read_Rsp48 (This, Rsp);
if (Rsp and 16#fff#) /= 16#1a5# then
-- Bad voltage or bad pattern.
Status := Error;
return;
end if;
else
-- If SD Card, then it's v1.1
Info.Card_Type := STD_Capacity_SD_Card_V1_1;
end if;
for I in 1 .. 5 loop
This.Delay_Milliseconds (200);
-- CMD55: APP_CMD
-- This is done manually to handle error (this command is not
-- supported by mmc).
Send_Cmd (This, Cmd_Desc (App_Cmd), 0, Status);
if Status /= OK then
if Status = Command_Timeout_Error
and then I = 1
and then Info.Card_Type = STD_Capacity_SD_Card_V1_1
then
-- Not an SDCard. Suppose MMC.
Info.Card_Type := Multimedia_Card;
exit;
end if;
return;
end if;
-- ACMD41: SD_SEND_OP_COND (no crc check)
-- Arg: HCS=1, XPC=0, S18R=0
Send_Cmd
(This, Acmd_Desc (SD_App_Send_Op_Cond), 16#40ff_0000#, Status);
if Status /= OK then
return;
end if;
Read_Rsp48 (This, Rsp);
if (Rsp and SD_OCR_High_Capacity) = SD_OCR_High_Capacity then
Info.Card_Type := High_Capacity_SD_Card;
end if;
if (Rsp and SD_OCR_Power_Up) = 0 then
Status := Error;
else
Status := OK;
exit;
end if;
end loop;
if Status = Command_Timeout_Error
and then Info.Card_Type = Multimedia_Card
then
for I in 1 .. 5 loop
This.Delay_Milliseconds (200);
-- CMD1: SEND_OP_COND query voltage
Send_Cmd (This, Cmd_Desc (Send_Op_Cond), 16#00ff_8000#, Status);
if Status /= OK then
return;
end if;