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luis.rigoni
Joined: 14 Oct 2010
Posts: 12
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| ex_fat.c problem with SPI |
 Posted: Thu Oct 14, 2010 9:33 am |
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Hello,
I'm starting to develop an SD card reader with the PIC18F4550. Communication with the PC is via USB. USB communication is OK.
However when compiling the file ex_fat.c generates 100 errors.
The main errors are:
| Code: | Library in USE not found "SPI"
line: #use spi(MASTER,CLK=MMCSD_PIN_SCL, DO=MMCSD_PIN_SDO, DI=MMCSD_PIN_SDI, BITS=8, MODE=3, stream=mmcsd_spi, FORCE_HW)
Undefined identifier - output_drive
line: output_drive(MMCSD_PIN_SCL);
Undefined identifier - spi_xfer
line: spi_xfer(mmcsd_spi, 0xFF); |
What can cause these errors? What changes must I do to compile?
I'm using PCB / PCM / PCH version 3.242. PCD version 4.093.
Thanks in advance |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Oct 14, 2010 12:35 pm |
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| Quote: |
I'm starting to develop an SD card reader with the PIC18F4550.
I'm using PCH version 3.242.
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Your compiler version doesn't support those new features. |
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luis.rigoni
Joined: 14 Oct 2010
Posts: 12
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| Posted: Thu Oct 14, 2010 12:42 pm |
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| PCM programmer wrote: | | Your compiler version doesn't support those new features. |
Is there any way to fix the code to make it compatible with the compiler? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Oct 14, 2010 2:12 pm |
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Get rid of the #use spi() and substitute a setup_spi() statement near
the start of main(). Then do it like this:
| Code: |
// SPI mode definitions.
#define SPI_MODE_0 (SPI_L_TO_H | SPI_XMIT_L_TO_H)
#define SPI_MODE_1 (SPI_L_TO_H)
#define SPI_MODE_2 (SPI_H_TO_L)
#define SPI_MODE_3 (SPI_H_TO_L | SPI_XMIT_L_TO_H)
void main()
{
setup_spi(SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_16 );
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Then in every case where spi_xfer() is used, edit the line and change
it to spi_read().
| Quote: |
output_drive(MMCSD_PIN_SCL);
output_drive(MMCSD_PIN_SDO);
output_drive(MMCSD_PIN_SELECT);
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In the case of the lines above, you can substitute this below:
| Code: |
output_low(MMCSD_PIN_SCL);
output_low(MMCSD_PIN_SDO);
output_high(MMCSD_PIN_SELECT);
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Each one is initialized to it's inactive state (low or high, as required).
I don't guarantee that these are the only things you need to do, or that
it will even work. What I've shown in correct, to my knowledge, but I
don't know if your compiler version will work with driver code you have.
It's up to you to make it work. |
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