From: asterix Date: Tue, 30 Oct 2007 15:01:21 +0000 (+0000) Subject: Rename spi_emu in spi_bitbang. X-Git-Tag: 1.0.0~274 X-Git-Url: https://codewiz.org/gitweb?a=commitdiff_plain;h=99c4b926f3abbc334bcf459b1d9057ab9bd255de;p=bertos.git Rename spi_emu in spi_bitbang. git-svn-id: https://src.develer.com/svnoss/bertos/trunk@968 38d2e660-2303-0410-9eaa-f027e97ec537 --- diff --git a/drv/spi_bitbang.c b/drv/spi_bitbang.c new file mode 100644 index 00000000..9d15ca19 --- /dev/null +++ b/drv/spi_bitbang.c @@ -0,0 +1,118 @@ +/** + * \file + * + * + * \brief Emulated SPI Master for DSP firmware download (impl.) + * + * \version $Id: spi.c 15328 2007-03-21 15:07:04Z batt $ + * + * \author Francesco Sacchi + * \author Daniele Basile + */ + + +#include +#include +#include +#include "hw_spi.h" + +void spi_assertSS(void) +{ + ATOMIC(SS_ACTIVE()); +} + +void spi_deassertSS(void) +{ + ATOMIC(SS_INACTIVE()); +} + +/** + * Send byte \c c over MOSI line, CONFIG_SPI_DATAORDER first. + * SS pin state is left unchanged. + */ +uint8_t spi_sendRecv(uint8_t c) +{ + uint8_t data = 0; + uint8_t shift = SPI_DATAORDER_START; + + + ATOMIC( + for (int i = 0; i < 8; i++) + { + /* Shift the i-th bit to MOSI */ + if (c & shift) + MOSI_HIGH(); + else + MOSI_LOW(); + /* Assert clock */ + SCK_ACTIVE(); + data |= IS_MISO_HIGH() ? shift : 0; + /* De-assert clock */ + SCK_INACTIVE(); + SPI_DATAORDER_SHIFT(shift); + } + ); + return data; +} + +MOD_DEFINE(spi); +void spi_init(void) +{ + ATOMIC(SPI_HW_INIT()); + MOD_INIT(spi); +} + +/** + * Read \param len from spi, and put it in \param buff. + */ +void spi_read(void *_buff, size_t len) +{ + uint8_t *buff = (uint8_t *)_buff; + + while (len--) + /* Read byte from spi and put it in buffer. */ + *buff++ = spi_sendRecv(0); + +} + +/** + * Write \param len to spi, and take it from \param buff. + */ +void spi_write(const void *_buff, size_t len) +{ + const uint8_t *buff = (const uint8_t *)_buff; + + while (len--) + /* Write byte pointed at by *buff to spi */ + spi_sendRecv(*buff++); + +} diff --git a/drv/spi_bitbang.h b/drv/spi_bitbang.h new file mode 100644 index 00000000..ff716906 --- /dev/null +++ b/drv/spi_bitbang.h @@ -0,0 +1,72 @@ +/** + * \file + * + * + * \brief Emulated SPI Master for DSP firmware download (interface) + * + * \version $Id: spi.h 15321 2007-03-21 14:45:12Z asterix $ + * + * \author Francesco Sacchi + * \author Daniele Basile + */ + + +#ifndef DRV_SPI_EMU_H +#define DRV_SPI_EMU_H + +#include +#include + +/** + * Define send and receive order bit. + * \{ + */ +#define SPI_LSB_FIRST 1 +#define SPI_MSB_FIRST 2 +/* \} */ + +#if CONFIG_SPI_DATAORDER == SPI_LSB_FIRST + #define SPI_DATAORDER_START 1 + #define SPI_DATAORDER_SHIFT(i) ((i) <<= 1) +#elif CONFIG_SPI_DATAORDER == SPI_MSB_FIRST + #define SPI_DATAORDER_START 0x80 + #define SPI_DATAORDER_SHIFT(i) ((i) >>= 1) +#endif + +void spi_write(const void *buf, size_t len); +void spi_read(void *buf, size_t len); +uint8_t spi_sendRecv(uint8_t c); +void spi_init(void); +void spi_assertSS(void); +void spi_deassertSS(void); + +#endif /* DRV_SPI_EMU_H */ diff --git a/drv/spi_emu.c b/drv/spi_emu.c deleted file mode 100644 index 9d15ca19..00000000 --- a/drv/spi_emu.c +++ /dev/null @@ -1,118 +0,0 @@ -/** - * \file - * - * - * \brief Emulated SPI Master for DSP firmware download (impl.) - * - * \version $Id: spi.c 15328 2007-03-21 15:07:04Z batt $ - * - * \author Francesco Sacchi - * \author Daniele Basile - */ - - -#include -#include -#include -#include "hw_spi.h" - -void spi_assertSS(void) -{ - ATOMIC(SS_ACTIVE()); -} - -void spi_deassertSS(void) -{ - ATOMIC(SS_INACTIVE()); -} - -/** - * Send byte \c c over MOSI line, CONFIG_SPI_DATAORDER first. - * SS pin state is left unchanged. - */ -uint8_t spi_sendRecv(uint8_t c) -{ - uint8_t data = 0; - uint8_t shift = SPI_DATAORDER_START; - - - ATOMIC( - for (int i = 0; i < 8; i++) - { - /* Shift the i-th bit to MOSI */ - if (c & shift) - MOSI_HIGH(); - else - MOSI_LOW(); - /* Assert clock */ - SCK_ACTIVE(); - data |= IS_MISO_HIGH() ? shift : 0; - /* De-assert clock */ - SCK_INACTIVE(); - SPI_DATAORDER_SHIFT(shift); - } - ); - return data; -} - -MOD_DEFINE(spi); -void spi_init(void) -{ - ATOMIC(SPI_HW_INIT()); - MOD_INIT(spi); -} - -/** - * Read \param len from spi, and put it in \param buff. - */ -void spi_read(void *_buff, size_t len) -{ - uint8_t *buff = (uint8_t *)_buff; - - while (len--) - /* Read byte from spi and put it in buffer. */ - *buff++ = spi_sendRecv(0); - -} - -/** - * Write \param len to spi, and take it from \param buff. - */ -void spi_write(const void *_buff, size_t len) -{ - const uint8_t *buff = (const uint8_t *)_buff; - - while (len--) - /* Write byte pointed at by *buff to spi */ - spi_sendRecv(*buff++); - -} diff --git a/drv/spi_emu.h b/drv/spi_emu.h deleted file mode 100644 index ff716906..00000000 --- a/drv/spi_emu.h +++ /dev/null @@ -1,72 +0,0 @@ -/** - * \file - * - * - * \brief Emulated SPI Master for DSP firmware download (interface) - * - * \version $Id: spi.h 15321 2007-03-21 14:45:12Z asterix $ - * - * \author Francesco Sacchi - * \author Daniele Basile - */ - - -#ifndef DRV_SPI_EMU_H -#define DRV_SPI_EMU_H - -#include -#include - -/** - * Define send and receive order bit. - * \{ - */ -#define SPI_LSB_FIRST 1 -#define SPI_MSB_FIRST 2 -/* \} */ - -#if CONFIG_SPI_DATAORDER == SPI_LSB_FIRST - #define SPI_DATAORDER_START 1 - #define SPI_DATAORDER_SHIFT(i) ((i) <<= 1) -#elif CONFIG_SPI_DATAORDER == SPI_MSB_FIRST - #define SPI_DATAORDER_START 0x80 - #define SPI_DATAORDER_SHIFT(i) ((i) >>= 1) -#endif - -void spi_write(const void *buf, size_t len); -void spi_read(void *buf, size_t len); -uint8_t spi_sendRecv(uint8_t c); -void spi_init(void); -void spi_assertSS(void); -void spi_deassertSS(void); - -#endif /* DRV_SPI_EMU_H */