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tinySA/os/hal/platforms/LPC13xx/spi_lld.h

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/*
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 LPC13xx/spi_lld.h
* @brief LPC13xx low level SPI driver header.
*
* @addtogroup SPI
* @{
*/
#ifndef _SPI_LLD_H_
#define _SPI_LLD_H_
#if HAL_USE_SPI || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/**
* @brief Hardware FIFO depth.
*/
#define LPC13xx_SSP_FIFO_DEPTH 8
#define CR0_DSSMASK 0x0F
#define CR0_DSS4BIT 3
#define CR0_DSS5BIT 4
#define CR0_DSS6BIT 5
#define CR0_DSS7BIT 6
#define CR0_DSS8BIT 7
#define CR0_DSS9BIT 8
#define CR0_DSS10BIT 9
#define CR0_DSS11BIT 0xA
#define CR0_DSS12BIT 0xB
#define CR0_DSS13BIT 0xC
#define CR0_DSS14BIT 0xD
#define CR0_DSS15BIT 0xE
#define CR0_DSS16BIT 0xF
#define CR0_FRFSPI 0
#define CR0_FRFSSI 0x10
#define CR0_FRFMW 0x20
#define CR0_CPOL 0x40
#define CR0_CPHA 0x80
#define CR0_CLOCKRATE(n) ((n) << 8)
#define CR1_LBM 1
#define CR1_SSE 2
#define CR1_MS 4
#define CR1_SOD 8
#define SR_TFE 1
#define SR_TNF 2
#define SR_RNE 4
#define SR_RFF 8
#define SR_BSY 16
#define IMSC_ROR 1
#define IMSC_RT 2
#define IMSC_RX 4
#define IMSC_TX 8
#define RIS_ROR 1
#define RIS_RT 2
#define RIS_RX 4
#define RIS_TX 8
#define MIS_ROR 1
#define MIS_RT 2
#define MIS_RX 4
#define MIS_TX 8
#define ICR_ROR 1
#define ICR_RT 2
/**
* @brief SCK0 signal assigned to pin PIO0_10.
*/
#define SCK0_IS_PIO0_10 0
/**
* @brief SCK0 signal assigned to pin PIO2_11.
*/
#define SCK0_IS_PIO2_11 1
/**
* @brief SCK0 signal assigned to pin PIO0_6.
*/
#define SCK0_IS_PIO0_6 2
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @brief SPI1 driver enable switch.
* @details If set to @p TRUE the support for device SSP0 is included.
* @note The default is @p TRUE.
*/
#if !defined(LPC13xx_SPI_USE_SSP0) || defined(__DOXYGEN__)
#define LPC13xx_SPI_USE_SSP0 TRUE
#endif
/**
* @brief SPI2 driver enable switch.
* @details If set to @p TRUE the support for device SSP1 is included.
* @note The default is @p TRUE.
*/
#if !defined(LPC13xx_SPI_USE_SSP1) || defined(__DOXYGEN__)
#define LPC13xx_SPI_USE_SSP1 FALSE
#endif
/**
* @brief SSP0 PCLK divider.
*/
#if !defined(LPC13xx_SPI_SSP0CLKDIV) || defined(__DOXYGEN__)
#define LPC13xx_SPI_SSP0CLKDIV 1
#endif
/**
* @brief SSP1 PCLK divider.
*/
#if !defined(LPC13xx_SPI_SSP1CLKDIV) || defined(__DOXYGEN__)
#define LPC13xx_SPI_SSP1CLKDIV 1
#endif
/**
* @brief SPI0 interrupt priority level setting.
*/
#if !defined(LPC13xx_SPI_SSP0_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define LPC13xx_SPI_SSP0_IRQ_PRIORITY 5
#endif
/**
* @brief SPI1 interrupt priority level setting.
*/
#if !defined(LPC13xx_SPI_SSP1_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define LPC13xx_SPI_SSP1_IRQ_PRIORITY 5
#endif
/**
* @brief Overflow error hook.
* @details The default action is to stop the system.
*/
#if !defined(LPC13xx_SPI_SSP_ERROR_HOOK) || defined(__DOXYGEN__)
#define LPC13xx_SPI_SSP_ERROR_HOOK(spip) chSysHalt()
#endif
/**
* @brief SCK0 signal selector.
*/
#if !defined(LPC13xx_SPI_SCK0_SELECTOR) || defined(__DOXYGEN__)
#define LPC13xx_SPI_SCK0_SELECTOR SCK0_IS_PIO2_11
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if (LPC13xx_SPI_SSP0CLKDIV < 1) || (LPC13xx_SPI_SSP0CLKDIV > 255)
#error "invalid LPC13xx_SPI_SSP0CLKDIV setting"
#endif
#if (LPC13xx_SPI_SSP1CLKDIV < 1) || (LPC13xx_SPI_SSP1CLKDIV > 255)
#error "invalid LPC13xx_SPI_SSP1CLKDIV setting"
#endif
#if !LPC13xx_SPI_USE_SSP0 && !LPC13xx_SPI_USE_SSP1
#error "SPI driver activated but no SPI peripheral assigned"
#endif
#if (LPC13xx_SPI_SCK0_SELECTOR != SCK0_IS_PIO0_10) && \
(LPC13xx_SPI_SCK0_SELECTOR != SCK0_IS_PIO2_11) && \
(LPC13xx_SPI_SCK0_SELECTOR != SCK0_IS_PIO0_6)
#error "invalid pin assigned to SCK0 signal"
#endif
/**
* @brief SSP0 clock.
*/
#define LPC13xx_SPI_SSP0_PCLK \
(LPC13xx_MAINCLK / LPC13xx_SPI_SSP0CLKDIV)
/**
* @brief SSP1 clock.
*/
#define LPC13xx_SPI_SSP1_PCLK \
(LPC13xx_MAINCLK / LPC13xx_SPI_SSP1CLKDIV)
/*===========================================================================*/
/* 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 SSP CR0 initialization data.
*/
uint16_t cr0;
/**
* @brief SSP CPSR initialization data.
*/
uint32_t cpsr;
} 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 SSP registers block.
*/
LPC_SSP_TypeDef *ssp;
/**
* @brief Number of bytes yet to be received.
*/
uint32_t rxcnt;
/**
* @brief Receive pointer or @p NULL.
*/
void *rxptr;
/**
* @brief Number of bytes yet to be transmitted.
*/
uint32_t txcnt;
/**
* @brief Transmit pointer or @p NULL.
*/
const void *txptr;
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#if LPC13xx_SPI_USE_SSP0 && !defined(__DOXYGEN__)
extern SPIDriver SPID1;
#endif
#if LPC13xx_SPI_USE_SSP1 && !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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