Circuit to Interface 1GB SD Card to P89V51RD2 via SPI and MAX232 for Hyperterminal

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How can I connect a 1 GB SD card to a P89V51RD2 microcontroller over SPI and send data to HyperTerminal through a MAX232?

You need to connect the SD card to the P89V51RD2 through the SPI lines (MISO, MOSI, CLK, and CS), not directly to HyperTerminal, and use a proper microcontroller+SD-card interface schematic [#21671043][#21671048] The SD card should ideally be powered at 3.3 V; applying 5 V may work but will shorten the device life [#21671045] The card can run from 0 to 25 MHz, but the microcontroller must be programmed to read the SD card before it will work [#21671047] If HyperTerminal shows nothing, first short pins 2 and 3 of the RS232/D9 connector to verify the terminal and serial path are working [#21671047][#21671052] If HyperTerminal still misbehaves, try another terminal program because HyperTerminal has known problems and is not included on Vista/7 [#21671052]

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#1 21671042 19 Feb 2014 23:35

Darpan Damani Darpan Damani

Anonymous

Post #1
21671042 19 Feb 2014 23:35

Hello
I am using p89v51rd2 which supports spi..
can anyone give me the ckt required to connect my sd card to hyperterminal through max232..
i have dbts in that how to connect?
do i connect my card to my 89v51rd2 and then muc to hyperterminal?
can someone help with the ckt using p89v51rd2
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#2 21671043 20 Feb 2014 02:31

Neil Mula Neil Mula

Anonymous

Post #2
21671043 20 Feb 2014 02:31

Hi Darpan,

I attached a simple schematic regarding the interface.
I hope it will help

Good Luck
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#3 21671044 20 Feb 2014 03:02

Darpan Damani Darpan Damani

Anonymous

Post #3
21671044 20 Feb 2014 03:02

Hello Neil,
Is it okay if i give 5v supply to sd card, because it needs 3.3v..
thanks for the help
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#4 21671045 20 Feb 2014 03:25

Neil Mula Neil Mula

Anonymous

Post #4
21671045 20 Feb 2014 03:25

Yes, but it will shorten the life span of the device.
#5 21671046 20 Feb 2014 08:57

Darpan Damani Darpan Damani

Anonymous

Post #5
21671046 20 Feb 2014 08:57

Hello Neil
I did that circuit which you had suggested me..
But the hyperterminal is not responding..
Do i need to burn my microcontroller and what clock freq the 1gb memory card should get to work?
which mode should i choose in spi

thanks for the help
Loopback test for HyperTerminal and SD card setup
#6 21671047 20 Feb 2014 22:31

Neil Mula Neil Mula

Anonymous

Loopback test for HyperTerminal and SD card setup
Post #6 21671047 20 Feb 2014 22:31

Hi Darpan,

Yes, You need to burn it if the microcontroller (or AVR) is not yet set to read with SD cards. It is the same with microcontrollers that are available in the market. SD cards can run from 0 to 25MHz. I will attached a design circuit with the microcontroller and SD card interface.

In case you want to verify if the hyperterminal is not really responding, try to short pin 2 and pin 3 of the rs232 port or D9 connector. This will produce data character on the hyperterminal screen if the hyperterminal is really working.

You can also try other Terminal Programs and Compilers that are designed to program microcontrollers such uVision 3 and Flash Magic.

Good Luck
#7 21671048 20 Feb 2014 22:48

Neil Mula Neil Mula

Anonymous

Post #7
21671048 20 Feb 2014 22:48

This is the designed circuit for Microcontroller+ISP+SD Card interface. I hope it will help.
Missing SD card initialization and UART code
#8 21671049 22 Feb 2014 04:43

Darpan Damani Darpan Damani

Anonymous

Missing SD card initialization and UART code
Post #8 21671049 22 Feb 2014 04:43

Hello neil,
i dont know what that isp programmer is..but i have a development board whyich has on board burning facilities.
i had connected miso mosi clk and cs lines of my controller to the card.following is the code which i burnt in my controller, still the hyperterminal is nt responding..
#define ss_pin P1_4

void spi_config_master()
{
ss_pin=0;
SPCR=0X50;
SPSR=0X00;
SPDAT=0X00;
}

void main()
{

P0=0XFF;
P1=0xFF;
P3=0XFF;
P2=0XFF;

spi_config_master();
}
Thanks
#9 21671050 23 Feb 2014 11:46

Darpan Damani Darpan Damani

Anonymous

Post #9
21671050 23 Feb 2014 11:46

This is the code which i have burned in my controller..
Thanks
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#10 21671051 24 Feb 2014 21:03

Nikki Martinez Nikki Martinez

Anonymous

Post #10
21671051 24 Feb 2014 21:03

test...
Recommend using other terminal programs than HyperTerminal
#11 21671052 25 Feb 2014 00:18

Neil Mula Neil Mula

Anonymous

Recommend using other terminal programs than HyperTerminal
Post #11 21671052 25 Feb 2014 00:18

Hi Darpan,

In case you have tried the second statement above:
" try to short pin 2 and pin 3 of the rs232 port or D9 connector. This will produce data character on the hyperterminal screen if the hyperterminal is really working."

Then try 3rd statement above:
"try other Terminal Programs and Compilers that are designed to program microcontrollers such uVision 3 and Flash Magic."

By the way, HyperTerminal has many problems that is why they are not on windows Vista and windows 7.

I recommend try other Terminal Programs that are available on the net.

Good Luck
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Topic summary

The discussion focuses on interfacing a 1GB SD card with the P89V51RD2 microcontroller using SPI communication and connecting it to a PC HyperTerminal via a MAX232 level converter. A simple schematic was shared to illustrate the connections. It was clarified that the SD card requires a 3.3V supply, and applying 5V can damage the card. The microcontroller firmware must be programmed (burned) to handle SPI communication with the SD card. The SD card can operate up to 25MHz SPI clock frequency. Troubleshooting steps include verifying HyperTerminal functionality by shorting RS232 pins 2 and 3, and trying alternative terminal programs like uVision 3 or Flash Magic due to known HyperTerminal issues on newer Windows versions. Sample SPI initialization code for the P89V51RD2 was provided, but the user reported no response on HyperTerminal, indicating possible issues with code or hardware connections. An ISP programmer or onboard burning facility is required to program the microcontroller. The discussion emphasizes correct wiring of MISO, MOSI, CLK, and CS lines between the microcontroller and SD card, proper voltage levels, and verifying terminal communication.
AI summary based on the discussion. May contain errors.

Circuit to Interface 1GB SD Card to P89V51RD2 via SPI and MAX232 for Hyperterminal

How can I connect a 1 GB SD card to a P89V51RD2 microcontroller over SPI and send data to HyperTerminal through a MAX232?

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Topic summary