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STM8 SPI driver (untested). 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2316 35acf78f-673a-0410-8e92-d51de3d6d3f4
This commit is contained in:
gdisirio 2010-11-01 10:03:30 +00:00
parent a5c6d5b45b
commit 4ed04c3764
2 changed files with 489 additions and 0 deletions
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296
os/hal/platforms/STM8/spi_lld.c Normal file
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file STM8/spi_lld.c
* @brief STM8 low level SPI driver code.
*
* @addtogroup SPI
* @{
*/
#include "ch.h"
#include "hal.h"
#if CH_HAL_USE_SPI || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
#if STM8_SPI_USE_SPI || defined(__DOXYGEN__)
/** @brief SPI1 driver identifier.*/
SPIDriver SPID1;
#endif
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if STM8_SPI_USE_SPI || defined(__DOXYGEN__)
/**
* @brief IRQ 10 service routine.
*
* @isr
*/
CH_IRQ_HANDLER(10) {
CH_IRQ_PROLOGUE();
if ((SPI->SR & SPI_SR_OVR) != 0) {
/* The overflow condition should never happen because priority is given
to receive but a hook macro is provided anyway...*/
STM8_SPI_SPI_ERROR_HOOK(&SPID1);
}
/* Handling the DR register like it is a FIFO with depth>1 in order to
handle the case where a frame arrives immediately after reading the
DR register.*/
while ((SPI->SR & SPI_SR_RXNE) != 0) {
if (SPID1.spd_rxptr != NULL)
*SPID1.spd_rxptr++ = SPI->DR;
else
(void)SPI->DR;
if (--SPID1.spd_rxcnt == 0) {
chDbgAssert(SPID1.spd_txcnt == 0,
"IRQ10, #1", "counter out of synch");
/* Stops all the IRQ sources.*/
SPI->ICR = 0;
/* Portable SPI ISR code defined in the high level driver, note, it
is a macro.*/
_spi_isr_code(&SPID1);
/* Goto because it is mandatory to go through the epilogue, cannot
just return.*/
goto exit_isr;
}
}
/* Loading the DR register like it is a FIFO with depth>1 in order to
handle the case where the shift register is empty too.*/
while ((SPI->SR & SPI_SR_TXE) != 0) {
if (SPID1.spd_txptr != NULL)
SPI->DR = *SPID1.spd_txptr++;
else
SPI->DR = 0xFF;
if (--SPID1.spd_txcnt == 0) {
/* Stops just the TX interrupt source.*/
SPI->ICR &= ~SPI_ICR_TXEI;
break;
}
}
exit_isr:
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level SPI driver initialization.
*
* @notapi
*/
void spi_lld_init(void) {
#if STM8_SPI_USE_SPI
spiObjectInit(&SPID1);
#endif /* STM8_SPI_USE_SPI */
}
/**
* @brief Configures and activates the SPI peripheral.
*
* @param[in] spip pointer to the @p SPIDriver object
*
* @notapi
*/
void spi_lld_start(SPIDriver *spip) {
/* Clock activation.*/
CLK->PCKENR1 |= CLK_PCKENR1_SPI; /* PCKEN11, clock source. */
/* Configuration.*/
SPI->CR2 = SPI_CR2_SSI;
SPI->CR1 = spip->spd_config->spc_cr1 | SPI_CR1_SPE;
}
/**
* @brief Deactivates the SPI peripheral.
*
* @param[in] spip pointer to the @p SPIDriver object
*
* @notapi
*/
void spi_lld_stop(SPIDriver *spip) {
(void)spip;
/* Reset state.*/
SPI->CR1 = 0;
SPI->CR2 = 0;
SPI->ICR = 0;
/* Clock de-activation.*/
CLK->PCKENR1 &= ~CLK_PCKENR1_SPI; /* PCKEN11, clock source. */
}
/**
* @brief Asserts the slave select signal and prepares for transfers.
*
* @param[in] spip pointer to the @p SPIDriver object
*
* @notapi
*/
void spi_lld_select(SPIDriver *spip) {
palClearPad(spip->spd_config->spc_ssport, spip->spd_config->spc_sspad);
}
/**
* @brief Deasserts the slave select signal.
* @details The previously selected peripheral is unselected.
*
* @param[in] spip pointer to the @p SPIDriver object
*
* @notapi
*/
void spi_lld_unselect(SPIDriver *spip) {
palSetPad(spip->spd_config->spc_ssport, spip->spd_config->spc_sspad);
}
/**
* @brief Ignores data on the SPI bus.
* @details This function transmits a series of idle words on the SPI bus and
* ignores the received data. This function can be invoked even
* when a slave select signal has not been yet asserted.
*
* @param[in] spip pointer to the @p SPIDriver object
* @param[in] n number of words to be ignored
*
* @notapi
*/
void spi_lld_ignore(SPIDriver *spip, size_t n) {
spip->spd_rxptr = NULL;
spip->spd_txptr = NULL;
spip->spd_rxcnt = spip->spd_txcnt = n;
SPI->ICR = SPI_ICR_TXEI | SPI_ICR_RXEI | SPI_ICR_ERRIE;
}
/**
* @brief Exchanges data on the SPI bus.
* @details This asynchronous function starts a simultaneous transmit/receive
* operation.
* @post At the end of the operation the configured callback is invoked.
* @note The buffers are organized as uint8_t arrays for data sizes below or
* equal to 8 bits else it is organized as uint16_t arrays.
*
* @param[in] spip pointer to the @p SPIDriver object
* @param[in] n number of words to be exchanged
* @param[in] txbuf the pointer to the transmit buffer
* @param[out] rxbuf the pointer to the receive buffer
*
* @notapi
*/
void spi_lld_exchange(SPIDriver *spip, size_t n,
const void *txbuf, void *rxbuf) {
spip->spd_rxptr = rxbuf;
spip->spd_txptr = txbuf;
spip->spd_rxcnt = spip->spd_txcnt = n;
SPI->ICR = SPI_ICR_TXEI | SPI_ICR_RXEI | SPI_ICR_ERRIE;
}
/**
* @brief Sends data over the SPI bus.
* @details This asynchronous function starts a transmit operation.
* @post At the end of the operation the configured callback is invoked.
* @note The buffers are organized as uint8_t arrays for data sizes below or
* equal to 8 bits else it is organized as uint16_t arrays.
*
* @param[in] spip pointer to the @p SPIDriver object
* @param[in] n number of words to send
* @param[in] txbuf the pointer to the transmit buffer
*
* @notapi
*/
void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf) {
spip->spd_rxptr = NULL;
spip->spd_txptr = txbuf;
spip->spd_rxcnt = spip->spd_txcnt = n;
SPI->ICR = SPI_ICR_TXEI | SPI_ICR_RXEI | SPI_ICR_ERRIE;
}
/**
* @brief Receives data from the SPI bus.
* @details This asynchronous function starts a receive operation.
* @post At the end of the operation the configured callback is invoked.
* @note The buffers are organized as uint8_t arrays for data sizes below or
* equal to 8 bits else it is organized as uint16_t arrays.
*
* @param[in] spip pointer to the @p SPIDriver object
* @param[in] n number of words to receive
* @param[out] rxbuf the pointer to the receive buffer
*
* @notapi
*/
void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {
spip->spd_rxptr = rxbuf;
spip->spd_txptr = NULL;
spip->spd_rxcnt = spip->spd_txcnt = n;
SPI->ICR = SPI_ICR_TXEI | SPI_ICR_RXEI | SPI_ICR_ERRIE;
}
/**
* @brief Exchanges one frame using a polled wait.
* @details This synchronous function exchanges one frame using a polled
* synchronization method. This function is useful when exchanging
* small amount of data on high speed channels, usually in this
* situation is much more efficient just wait for completion using
* polling than suspending the thread waiting for an interrupt.
*
* @param[in] spip pointer to the @p SPIDriver object
* @param[in] frame the data frame to send over the SPI bus
* @return The received data frame from the SPI bus.
*/
uint8_t spi_lld_polled_exchange(SPIDriver *spip, uint8_t frame) {
(void)spip;
SPI->DR = (uint32_t)frame;
while ((SPI->SR & SPI_SR_RXNE) == 0)
;
return (uint16_t)SPI->DR;
}
#endif /* CH_HAL_USE_SPI */
/** @} */

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os/hal/platforms/STM8/spi_lld.h Normal file
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file LPC13xx/spi_lld.h
* @brief LPC13xx low level SPI driver header.
*
* @addtogroup SPI
* @{
*/
#ifndef _SPI_LLD_H_
#define _SPI_LLD_H_
#if CH_HAL_USE_SPI || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* 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(STM8_SPI_USE_SPI) || defined(__DOXYGEN__)
#define STM8_SPI_USE_SPI TRUE
#endif
/**
* @brief Overflow error hook.
* @details The default action is to stop the system.
*/
#if !defined(STM8_SPI_SPI_ERROR_HOOK) || defined(__DOXYGEN__)
#define STM8_SPI_SPI_ERROR_HOOK(spip) chSysHalt()
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if !STM8_SPI_USE_SPI
#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.
* @note In order to use synchronous functions this field must be set to
* @p NULL, callbacks and synchronous operations are mutually
* exclusive.
*/
spicallback_t spc_endcb;
/* End of the mandatory fields.*/
/**
* @brief The chip select line port.
*/
ioportid_t spc_ssport;
/**
* @brief The chip select line pad number.
*/
uint16_t spc_sspad;
/**
* @brief SPI initialization data.
*/
uint8_t spc_cr1;
} SPIConfig;
/**
* @brief Structure representing a SPI driver.
*/
struct SPIDriver {
/**
* @brief Driver state.
*/
spistate_t spd_state;
/**
* @brief Current configuration data.
*/
const SPIConfig *spd_config;
#if SPI_USE_WAIT || defined(__DOXYGEN__)
/**
* @brief Waiting thread.
*/
Thread *spd_thread;
#endif /* SPI_USE_WAIT */
#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
#if CH_USE_MUTEXES || defined(__DOXYGEN__)
/**
* @brief Mutex protecting the bus.
*/
Mutex spd_mutex;
#elif CH_USE_SEMAPHORES
Semaphore spd_semaphore;
#endif
#endif /* SPI_USE_MUTUAL_EXCLUSION */
#if defined(SPI_DRIVER_EXT_FIELDS)
SPI_DRIVER_EXT_FIELDS
#endif
/* End of the mandatory fields.*/
/**
* @brief Number of bytes yet to be received.
*/
uint16_t spd_rxcnt;
/**
* @brief Receive pointer or @p NULL.
*/
uint8_t *spd_rxptr;
/**
* @brief Number of bytes yet to be transmitted.
*/
uint16_t spd_txcnt;
/**
* @brief Transmit pointer or @p NULL.
*/
const uint8_t *spd_txptr;
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#if STM8_SPI_USE_SPI && !defined(__DOXYGEN__)
extern SPIDriver SPID1;
#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);
uint8_t spi_lld_polled_exchange(SPIDriver *spip, uint8_t frame);
#ifdef __cplusplus
}
#endif
#endif /* CH_HAL_USE_SPI */
#endif /* _SPI_LLD_H_ */
/** @} */