diff options
Diffstat (limited to 'os/hal/platforms/AT91SAM7/spi_lld.h')
| -rw-r--r-- | os/hal/platforms/AT91SAM7/spi_lld.h | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/os/hal/platforms/AT91SAM7/spi_lld.h b/os/hal/platforms/AT91SAM7/spi_lld.h new file mode 100644 index 000000000..18299391a --- /dev/null +++ b/os/hal/platforms/AT91SAM7/spi_lld.h @@ -0,0 +1,219 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+/**
+ * @file AT91SAM7/spi_lld.h
+ * @brief AT91SAM7 low level SPI driver header.
+ *
+ * @addtogroup SPI
+ * @{
+ */
+
+#ifndef _SPI_LLD_H_
+#define _SPI_LLD_H_
+
+#if HAL_USE_SPI || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Device compatibility.. */
+/*===========================================================================*/
+
+#if defined (AT91C_BASE_SPI)
+#define AT91C_BASE_SPI0 AT91C_BASE_SPI
+#define AT91C_ID_SPI0 AT91C_ID_SPI
+
+#define SPI0_MISO (1 << 12)
+#define SPI0_MOSI (1 << 13)
+#define SPI0_SCK (1 << 14)
+#else
+#define SPI0_MISO (1 << 16)
+#define SPI0_MOSI (1 << 17)
+#define SPI0_SCK (1 << 18)
+
+#define SPI1_MISO (1 << 24)
+#define SPI1_MOSI (1 << 23)
+#define SPI1_SCK (1 << 22)
+#endif
+
+/*===========================================================================*/
+/* Driver constants. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver pre-compile time settings. */
+/*===========================================================================*/
+
+/**
+ * @brief SPID1 enable switch (SPI0 device).
+ * @details If set to @p TRUE the support for SPI0 is included.
+ * @note The default is @p TRUE.
+ */
+#if !defined(AT91SAM7_SPI_USE_SPI0) || defined(__DOXYGEN__)
+#define AT91SAM7_SPI_USE_SPI0 TRUE
+#endif
+
+/**
+ * @brief SPID2 enable switch (SPI1 device).
+ * @details If set to @p TRUE the support for SPI1 is included.
+ * @note The default is @p TRUE.
+ */
+#if !defined(AT91SAM7_SPI_USE_SPI1) || defined(__DOXYGEN__)
+#define AT91SAM7_SPI_USE_SPI1 TRUE
+#endif
+
+/**
+ * @brief SPI0 device interrupt priority level setting.
+ */
+#if !defined(AT91SAM7_SPI0_PRIORITY) || defined(__DOXYGEN__)
+#define AT91SAM7_SPI0_PRIORITY (AT91C_AIC_PRIOR_HIGHEST - 1)
+#endif
+
+/**
+ * @brief SPI1 device interrupt priority level setting.
+ */
+#if !defined(AT91SAM7_SPI1_PRIORITY) || defined(__DOXYGEN__)
+#define AT91SAM7_SPI1_PRIORITY (AT91C_AIC_PRIOR_HIGHEST - 1)
+#endif
+
+/*===========================================================================*/
+/* Derived constants and error checks. */
+/*===========================================================================*/
+
+#if defined (AT91C_BASE_SPI) && AT91SAM7_SPI_USE_SPI1
+#error "SPI1 not present"
+#endif
+
+#if !AT91SAM7_SPI_USE_SPI0 && !AT91SAM7_SPI_USE_SPI1
+#error "SPI driver activated but no SPI peripheral assigned"
+#endif
+
+/*===========================================================================*/
+/* Driver data structures and types. */
+/*===========================================================================*/
+
+/**
+ * @brief Type of a structure representing an SPI driver.
+ */
+typedef struct SPIDriver SPIDriver;
+
+/**
+ * @brief SPI notification callback type.
+ *
+ * @param[in] spip pointer to the @p SPIDriver object triggering the
+ * callback
+ */
+typedef void (*spicallback_t)(SPIDriver *spip);
+
+/**
+ * @brief Driver configuration structure.
+ */
+typedef struct {
+ /**
+ * @brief Operation complete callback or @p NULL.
+ */
+ spicallback_t end_cb;
+ /* End of the mandatory fields.*/
+ /**
+ * @brief The chip select line port.
+ */
+ ioportid_t ssport;
+ /**
+ * @brief The chip select line pad number.
+ */
+ uint16_t sspad;
+ /**
+ * @brief SPI Chip Select Register initialization data.
+ */
+ uint32_t csr;
+} SPIConfig;
+
+/**
+ * @brief Structure representing a SPI driver.
+ */
+struct SPIDriver {
+ /**
+ * @brief Driver state.
+ */
+ spistate_t state;
+ /**
+ * @brief Current configuration data.
+ */
+ const SPIConfig *config;
+#if SPI_USE_WAIT || defined(__DOXYGEN__)
+ /**
+ * @brief Waiting thread.
+ */
+ Thread *thread;
+#endif /* SPI_USE_WAIT */
+#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
+#if CH_USE_MUTEXES || defined(__DOXYGEN__)
+ /**
+ * @brief Mutex protecting the bus.
+ */
+ Mutex mutex;
+#elif CH_USE_SEMAPHORES
+ Semaphore semaphore;
+#endif
+#endif /* SPI_USE_MUTUAL_EXCLUSION */
+#if defined(SPI_DRIVER_EXT_FIELDS)
+ SPI_DRIVER_EXT_FIELDS
+#endif
+ /* End of the mandatory fields.*/
+ /**
+ * @brief Pointer to the SPIx registers block.
+ */
+ AT91PS_SPI spi;
+};
+
+/*===========================================================================*/
+/* Driver macros. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* External declarations. */
+/*===========================================================================*/
+
+#if AT91SAM7_SPI_USE_SPI0 && !defined(__DOXYGEN__)
+extern SPIDriver SPID1;
+#endif
+
+#if AT91SAM7_SPI_USE_SPI1 && !defined(__DOXYGEN__)
+extern SPIDriver SPID2;
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ void spi_lld_init(void);
+ void spi_lld_start(SPIDriver *spip);
+ void spi_lld_stop(SPIDriver *spip);
+ void spi_lld_select(SPIDriver *spip);
+ void spi_lld_unselect(SPIDriver *spip);
+ void spi_lld_ignore(SPIDriver *spip, size_t n);
+ void spi_lld_exchange(SPIDriver *spip, size_t n,
+ const void *txbuf, void *rxbuf);
+ void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf);
+ void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf);
+ uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_SPI */
+
+#endif /* _SPI_LLD_H_ */
+
+/** @} */
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