diff options
Diffstat (limited to 'os/hal/platforms/AT91SAM7/i2c_lld.c')
| -rw-r--r-- | os/hal/platforms/AT91SAM7/i2c_lld.c | 450 |
1 files changed, 0 insertions, 450 deletions
diff --git a/os/hal/platforms/AT91SAM7/i2c_lld.c b/os/hal/platforms/AT91SAM7/i2c_lld.c deleted file mode 100644 index 1e6e02829..000000000 --- a/os/hal/platforms/AT91SAM7/i2c_lld.c +++ /dev/null @@ -1,450 +0,0 @@ -/*
- 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.
-*/
-/*
- Concepts and parts of this file have been contributed by Uladzimir Pylinsky
- aka barthess.
- */
-
-/**
- * @file AT91SAM7/i2c_lld.c
- * @brief AT91SAM7 I2C subsystem low level driver source.
- * @note I2C peripheral interrupts on AT91SAM7 platform must have highest
- * priority in system.
- *
- * @addtogroup I2C
- * @{
- */
-
-#include "ch.h"
-#include "hal.h"
-
-#if HAL_USE_I2C || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Driver local definitions. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver constants. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
-/** @brief I2C1 driver identifier.*/
-#if SAM7_I2C_USE_I2C1 || defined(__DOXYGEN__)
-I2CDriver I2CD1;
-#endif
-
-/*===========================================================================*/
-/* Driver local variables and types. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver local functions. */
-/*===========================================================================*/
-
-/**
- * @brief Wakes up the waiting thread.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- * @param[in] msg wakeup message
- *
- * @notapi
- */
-#define wakeup_isr(i2cp, msg) { \
- chSysLockFromIsr(); \
- if ((i2cp)->thread != NULL) { \
- Thread *tp = (i2cp)->thread; \
- (i2cp)->thread = NULL; \
- tp->p_u.rdymsg = (msg); \
- chSchReadyI(tp); \
- } \
- chSysUnlockFromIsr(); \
-}
-
-/**
- * @brief Helper function.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @notapi
- */
-static void _i2c_lld_serve_rx_interrupt(I2CDriver *i2cp){
- if (i2cp->rxbytes == 1)
- AT91C_BASE_TWI->TWI_CR |= AT91C_TWI_STOP;
-
- *(i2cp->rxbuf) = AT91C_BASE_TWI->TWI_RHR;
- i2cp->rxbuf++;
- i2cp->rxbytes--;
- if (i2cp->rxbytes == 0){
- AT91C_BASE_TWI->TWI_IDR = AT91C_TWI_RXRDY;
- AT91C_BASE_TWI->TWI_IER = AT91C_TWI_TXCOMP;
- }
-}
-
-/**
- * @brief Helper function.
- * @note During write operation you do not need to set STOP manually.
- * It sets automatically when THR and shift registers becomes empty.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @notapi
- */
-static void _i2c_lld_serve_tx_interrupt(I2CDriver *i2cp){
-
- if (i2cp->txbytes == 0){
- AT91C_BASE_TWI->TWI_IDR = AT91C_TWI_TXRDY;
- AT91C_BASE_TWI->TWI_IER = AT91C_TWI_TXCOMP;
- }
- else{
- AT91C_BASE_TWI->TWI_THR = *(i2cp->txbuf);
- i2cp->txbuf++;
- i2cp->txbytes--;
- }
-}
-
-/**
- * @brief I2C shared ISR code.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @notapi
- */
-static void i2c_lld_serve_interrupt(I2CDriver *i2cp) {
-
- uint32_t sr;
- sr = AT91C_BASE_TWI->TWI_SR;
- /* this masking doing in official Atmel driver. Is it needed ??? */
- sr &= AT91C_BASE_TWI->TWI_IMR;
-
- if (sr & AT91C_TWI_NACK){
- i2cp->errors |= I2CD_ACK_FAILURE;
- wakeup_isr(i2cp, RDY_RESET);
- return;
- }
- if (sr & AT91C_TWI_RXRDY){
- _i2c_lld_serve_rx_interrupt(i2cp);
- }
- else if (sr & AT91C_TWI_TXRDY){
- _i2c_lld_serve_tx_interrupt(i2cp);
- }
- else if (sr & AT91C_TWI_TXCOMP){
- AT91C_BASE_TWI->TWI_IDR = AT91C_TWI_TXCOMP;
- wakeup_isr(i2cp, RDY_OK);
- }
- else
- chDbgPanic("Invalid value");
-}
-
-/*===========================================================================*/
-/* Driver interrupt handlers. */
-/*===========================================================================*/
-
-#if SAM7_I2C_USE_I2C1 || defined(__DOXYGEN__)
-/**
- * @brief I2C1 event interrupt handler.
- *
- * @notapi
- */
-CH_IRQ_HANDLER(TWI_IRQHandler) {
-
- CH_IRQ_PROLOGUE();
- i2c_lld_serve_interrupt(&I2CD1);
- AT91C_BASE_AIC->AIC_EOICR = 0;
- CH_IRQ_EPILOGUE();
-}
-#endif /* STM32_I2C_USE_I2C1 */
-
-/*===========================================================================*/
-/* Driver exported functions. */
-/*===========================================================================*/
-
-/**
- * @brief Low level I2C driver initialization.
- *
- * @notapi
- */
-void i2c_lld_init(void) {
-
-#if SAM7_I2C_USE_I2C1
- i2cObjectInit(&I2CD1);
- I2CD1.thread = NULL;
- I2CD1.txbuf = NULL;
- I2CD1.rxbuf = NULL;
- I2CD1.txbytes = 0;
- I2CD1.rxbytes = 0;
-
- AT91C_BASE_PIOA->PIO_PDR = AT91C_PA0_TWD | AT91C_PA1_TWCK;
- AT91C_BASE_PIOA->PIO_ASR = AT91C_PA0_TWD | AT91C_PA1_TWCK;
- AT91C_BASE_PIOA->PIO_MDER = AT91C_PA0_TWD | AT91C_PA1_TWCK;
- AT91C_BASE_PIOA->PIO_PPUDR = AT91C_PA0_TWD | AT91C_PA1_TWCK;
-
- AIC_ConfigureIT(AT91C_ID_TWI,
- AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL | SAM7_I2C_I2C1_IRQ_PRIORITY,
- TWI_IRQHandler);
-#endif /* STM32_I2C_USE_I2C1 */
-}
-
-/**
- * @brief Configures and activates the I2C peripheral.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @notapi
- */
-void i2c_lld_start(I2CDriver *i2cp) {
-
- volatile uint32_t fake;
-
- /* If in stopped state then enables the I2C clocks.*/
- if (i2cp->state == I2C_STOP) {
-
-#if SAM7_I2C_USE_I2C1
- if (&I2CD1 == i2cp) {
- /* enable peripheral clock */
- AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TWI);
-
- /* Enables associated interrupt vector.*/
- AIC_EnableIT(AT91C_ID_TWI);
-
- /* Reset */
- AT91C_BASE_TWI->TWI_CR = AT91C_TWI_SWRST;
- fake = AT91C_BASE_TWI->TWI_RHR;
-
- /* Set master mode */
- AT91C_BASE_TWI->TWI_CR = AT91C_TWI_MSDIS;
- AT91C_BASE_TWI->TWI_CR = AT91C_TWI_MSEN;
-
- /* Setup I2C parameters. */
- AT91C_BASE_TWI->TWI_CWGR = i2cp->config->cwgr;
- }
-#endif /* STM32_I2C_USE_I2C1 */
- }
-
- (void)fake;
-}
-
-/**
- * @brief Deactivates the I2C peripheral.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @notapi
- */
-void i2c_lld_stop(I2CDriver *i2cp) {
-
- /* If not in stopped state then disables the I2C clock.*/
- if (i2cp->state != I2C_STOP) {
-
-#if SAM7_I2C_USE_I2C1
- if (&I2CD1 == i2cp) {
- AT91C_BASE_TWI->TWI_IDR = AT91C_TWI_TXCOMP | AT91C_TWI_RXRDY |
- AT91C_TWI_TXRDY | AT91C_TWI_NACK;
- AT91C_BASE_PMC->PMC_PCDR = (1 << AT91C_ID_TWI);
- AIC_DisableIT(AT91C_ID_TWI);
- }
-#endif
- }
-}
-
-/**
- * @brief Receives data via the I2C bus as master.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- * @param[in] addr slave device address
- * @param[out] rxbuf pointer to the receive buffer
- * @param[in] rxbytes number of bytes to be received
- * @param[in] timeout this value is ignored on SAM7 platform.
- *
- * @return The operation status.
- * @retval RDY_OK if the function succeeded.
- * @retval RDY_RESET if one or more I2C errors occurred, the errors can
- * be retrieved using @p i2cGetErrors().
- *
- * @notapi
- */
-msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,
- uint8_t *rxbuf, size_t rxbytes,
- systime_t timeout) {
- (void)timeout;
-
- /* delete trash from RHR*/
- volatile uint32_t fake;
- fake = AT91C_BASE_TWI->TWI_RHR;
- (void)fake;
-
- /* Initializes driver fields.*/
- i2cp->rxbuf = rxbuf;
- i2cp->rxbytes = rxbytes;
-
- i2cp->txbuf = NULL;
- i2cp->txbytes = 0;
-
- /* tune master mode register */
- AT91C_BASE_TWI->TWI_MMR = 0;
- AT91C_BASE_TWI->TWI_MMR |= (addr << 16) | AT91C_TWI_MREAD;
-
- /* enable just needed interrupts */
- AT91C_BASE_TWI->TWI_IER = AT91C_TWI_RXRDY | AT91C_TWI_NACK;
-
- /* In single data byte master read or write, the START and STOP must both be set. */
- if (rxbytes == 1)
- AT91C_BASE_TWI->TWI_CR = AT91C_TWI_STOP | AT91C_TWI_START;
- else
- AT91C_BASE_TWI->TWI_CR = AT91C_TWI_START;
-
- /* Waits for the operation completion.*/
- i2cp->thread = chThdSelf();
- chSchGoSleepS(THD_STATE_SUSPENDED);
-
- return chThdSelf()->p_u.rdymsg;
-}
-
-/**
- * @brief Read data via the I2C bus as master using internal slave addressing.
- * @details Address bytes must be written in special purpose SAM7 registers.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- * @param[in] addr slave device address
- * @param[in] txbuf pointer to the transmit buffer
- * @param[in] txbytes number of bytes to be transmitted
- * @param[out] rxbuf pointer to the receive buffer
- * @param[in] rxbytes number of bytes to be received
- * @param[in] timeout this value is ignored on SAM7 platform.
- *
- * @return The operation status.
- * @retval RDY_OK if the function succeeded.
- * @retval RDY_RESET if one or more I2C errors occurred, the errors can
- * be retrieved using @p i2cGetErrors().
- *
- * @notapi
- */
-msg_t i2c_lld_transceive_timeout(I2CDriver *i2cp, i2caddr_t addr,
- const uint8_t *txbuf, size_t txbytes,
- uint8_t *rxbuf, size_t rxbytes,
- systime_t timeout) {
- (void)timeout;
-
- /* delete trash from RHR*/
- volatile uint32_t fake;
- fake = AT91C_BASE_TWI->TWI_RHR;
- (void)fake;
-
- /* Initializes driver fields.*/
- i2cp->rxbuf = rxbuf;
- i2cp->rxbytes = rxbytes;
-
- /* tune master mode register */
- AT91C_BASE_TWI->TWI_MMR = 0;
- AT91C_BASE_TWI->TWI_MMR |= (addr << 16) | (txbytes << 8) | AT91C_TWI_MREAD;
-
- /* store internal slave address in TWI_IADR registers */
- AT91C_BASE_TWI->TWI_IADR = 0;
- while (txbytes > 0){
- AT91C_BASE_TWI->TWI_IADR = (AT91C_BASE_TWI->TWI_IADR << 8);
- AT91C_BASE_TWI->TWI_IADR |= *(txbuf++);
- txbytes--;
- }
-
- /* enable just needed interrupts */
- AT91C_BASE_TWI->TWI_IER = AT91C_TWI_RXRDY | AT91C_TWI_NACK;
-
- /* Internal address of I2C slave was set in special Atmel registers.
- * Now we must call read function. The I2C cell automatically sends
- * bytes from IADR register to bus and issues repeated start. */
- if (rxbytes == 1)
- AT91C_BASE_TWI->TWI_CR = AT91C_TWI_STOP | AT91C_TWI_START;
- else
- AT91C_BASE_TWI->TWI_CR = AT91C_TWI_START;
-
- /* Waits for the operation completion.*/
- i2cp->thread = chThdSelf();
- chSchGoSleepS(THD_STATE_SUSPENDED);
-
- return chThdSelf()->p_u.rdymsg;
-}
-
-/**
- * @brief Transmits data via the I2C bus as master.
- * @details When performing reading through write you can not write more than
- * 3 bytes of data to I2C slave. This is SAM7 platform limitation.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- * @param[in] addr slave device address
- * @param[in] txbuf pointer to the transmit buffer
- * @param[in] txbytes number of bytes to be transmitted
- * @param[out] rxbuf pointer to the receive buffer
- * @param[in] rxbytes number of bytes to be received
- * @param[in] timeout this value is ignored on SAM7 platform.
- *
- * @return The operation status.
- * @retval RDY_OK if the function succeeded.
- * @retval RDY_RESET if one or more I2C errors occurred, the errors can
- * be retrieved using @p i2cGetErrors().
- *
- * @notapi
- */
-msg_t i2c_lld_master_transmit_timeout(I2CDriver *i2cp, i2caddr_t addr,
- const uint8_t *txbuf, size_t txbytes,
- uint8_t *rxbuf, size_t rxbytes,
- systime_t timeout) {
- (void)timeout;
-
- /* SAM7 specific check */
- chDbgCheck(((rxbytes == 0) ||
- ((txbytes > 0) && (txbytes < 4) && (rxbuf != NULL))),
- "i2c_lld_master_transmit_timeout");
-
- /* prepare to read through write operation */
- if (rxbytes > 0){
- return i2c_lld_transceive_timeout(i2cp, addr, txbuf, txbytes, rxbuf,
- rxbytes, timeout);
- }
- else{
- if (txbytes == 1){
- /* In single data byte master read or write, the START and STOP
- * must both be set. */
- AT91C_BASE_TWI->TWI_CR |= AT91C_TWI_STOP;
- }
- AT91C_BASE_TWI->TWI_MMR = 0;
- AT91C_BASE_TWI->TWI_MMR |= addr << 16;
-
- /* enable just needed interrupts */
- AT91C_BASE_TWI->TWI_IER = AT91C_TWI_TXRDY | AT91C_TWI_NACK;
-
- /* correct size and pointer because first byte will be written
- * for issue start condition */
- i2cp->txbuf = txbuf + 1;
- i2cp->txbytes = txbytes - 1;
-
- /* According to datasheet there is no need to set START manually
- * we just need to write first byte in THR */
- AT91C_BASE_TWI->TWI_THR = txbuf[0];
-
- /* Waits for the operation completion.*/
- i2cp->thread = chThdSelf();
- chSchGoSleepS(THD_STATE_SUSPENDED);
-
- return chThdSelf()->p_u.rdymsg;
- }
-}
-
-#endif /* HAL_USE_I2C */
-
-/** @} */
|