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Message |
gbie
Joined: 22 Apr 2009
Posts: 8
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| pic16f886 mmc read/write help |
 Posted: Wed Apr 22, 2009 2:38 am |
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MMC initializes fine.
When I do a write and get the response at the end, it turns up as 00000010 | 10000000... for the busy, when the expected is 00000101|000000...
When I do a read after that, I get what I wrote except shifted left one.
For example, if I write 00001010 512times, I will read 00010100 512times.
Or if I write 00000111 512times, I will read 00001110 512times.
It's weird because the responses for all the commands are fine so it's not like the entire dataout is being shifted over 1.
Has anyone else had this problem? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Apr 22, 2009 10:28 am |
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Shifted data may mean that you're using the wrong SPI mode.
Post your setup_spi() statement. |
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gbie
Joined: 22 Apr 2009
Posts: 8
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| Posted: Wed Apr 22, 2009 11:08 am |
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#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)
SETUP_SPI(SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_4); |
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jamilsalem
Joined: 29 Sep 2008
Posts: 3
Location: Uberlandia-MG-Brasil
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| BUG? PCWHD 4.084 and SPI |
| Posted: Wed Apr 22, 2009 4:06 pm |
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I am having problems with pcwhd 4.084. I developed a program that read and write sd memory card by hardware. When I initialize the compiler and compile my program, the compiler generate the correct code. In the second time, for the same program, the compiler generate other code, and the program burned not work correctly. Maybe this is a bug of the ccs compiler. By the way, use the following software part to configure the SPI to communicate with a SD memory card.
| Code: |
#use spi(MASTER,FORCE_HW, BITS=8, stream=MMCSD_SPI)
/////////////////////////////////////////////////////////////
#ifndef SAIDA
#define SAIDA 0
#endif
#ifndef ENTRADA
#define ENTRADA 1
#endif
// Configurações do Usuário - mudar de acordo com o pic escolhido
#byte PORTA_A = 0xf80 // (PIC16F - 0x05) (PIC18F - 0xf80)
#byte PORTA_B = 0xf81 // (PIC16F - 0x06) (PIC18F - 0xf81)
#byte PORTA_C = 0xf82 // (PIC16F - 0x07) (PIC18F - 0xf82)
#byte PIR1 = 0xf9e
#bit SSPIF = PIR1.3
#bit SPI_SCK = PORTA_C.3
#bit SPI_DO = PORTA_C.5
#bit SPI_DI = PORTA_C.4
#byte TRIS_PORTA_A = 0xf92 // (PIC16F - 00x85) (PIC18F - 0xf92)
#byte TRIS_PORTA_B = 0xf93 // (PIC16F - 0x86) (PIC18F - 0xf93)
#byte TRIS_PORTA_C = 0xf94 // (PIC16F - 0x87) (PIC18F - 0xf94)
#bit TRIS_SPI_SCK = TRIS_PORTA_C.3
#bit TRIS_SPI_SDI = TRIS_PORTA_C.4
#bit TRIS_SPI_SDO = TRIS_PORTA_C.5
#bit TRIS_SPI_MMC_CS = TRIS_PORTA_C.0//TRIS_PORTA_B.0
#bit TRIS_DETECTA_MMC = TRIS_PORTA_B.0//TRIS_PORTA_B.4
#bit MMC_CS = PORTA_B.2 //PORTA_B.0
#bit MMC_DETECT = PORTA_B.0 //PORTA_B.4
/////////////////////////////////////////////////////////////
#byte SSPBUF = 0xfc9 // (PIC16F - 0x13) (PIC18F - 0xfc9)
#byte SSPSTAT = 0xfc7 // (PIC16F - 0x94) (PIC18F - 0xfc7)
#byte SSPCON1 = 0xfc6 // (PIC16F - 0x14) (PIC18F - 0xfc6)
#byte SSPCON2 = 0xfc5 // (PIC16F - 0x91) (PIC18F - 0xfc5)
/////////////////////////////////////////////////////////////
#bit BF = SSPSTAT.0 // flag que indica recebimento ou envio no barramento SPI
#bit CKE = SSPSTAT.6 // 1 = transmissão de dados quando clock vai de ativo para idle, e 0 o contrário
#bit SMP = SSPSTAT.7 // em modo master deixar em 1 (amostra no final da msg enviada), em modo slave deixar em 0
#bit CKP = SSPCON1.4 // polaridade do clock, (1 clock é ativado em nível baixo, 0 o clock é ativado em nível alto)
#bit SSPEN = SSPCON1.5 // 1 = spi mode, 0 = io mode
#define SPI_SLAVE_SS_DESABILITADO 0xf5
#define SPI_SLAVE_SS_HABILITADO 0xf4
#define SPI_MASTER_SCK_TMR2 0xf3
#define SPI_MASTER_SCK_DIV_64 0xf2
#define SPI_MASTER_SCK_DIV_16 0xf1
#define SPI_MASTER_SCK_DIV_4 0xf0
/////////////////////////////////////////////////////////////
//
//
....
....
//
//
// setup_spi(SPI_SS_DISABLED);
TRIS_SPI_SCK = SAIDA;
TRIS_SPI_SDI = ENTRADA;
TRIS_SPI_SDO = SAIDA;
TRIS_SPI_MMC_CS = SAIDA;
//
MMC_CS = TRUE;
SPI_SCK = TRUE;
SPI_DI = TRUE;
SPI_DO = FALSE;
//
mmcsd_deselect();
SSPEN = FALSE;
SSPCON1 = SPI_MASTER_SCK_DIV_4;
// CKE = FALSE;
// SMP = TRUE;
// CKP = TRUE;
CKE = TRUE;
SMP = FALSE;
CKP = FALSE;
SSPIF = FALSE;
SSPEN = TRUE;
//
//<continue your code here> |
Thanks.
jamilsalem@gmail.com |
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gbie
Joined: 22 Apr 2009
Posts: 8
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| Posted: Wed Apr 22, 2009 5:01 pm |
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problem fixed:
i was sending the wrong data start byte. |
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