diff options
Diffstat (limited to 'os/hal/platforms/AVR/i2c_lld.c')
| -rw-r--r-- | os/hal/platforms/AVR/i2c_lld.c | 289 |
1 files changed, 0 insertions, 289 deletions
diff --git a/os/hal/platforms/AVR/i2c_lld.c b/os/hal/platforms/AVR/i2c_lld.c deleted file mode 100644 index 8db158fbd..000000000 --- a/os/hal/platforms/AVR/i2c_lld.c +++ /dev/null @@ -1,289 +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.
-*/
-
-/**
- * @file AVR/i2c_lld.c
- * @brief AVR I2C subsystem low level driver source.
- *
- * @addtogroup I2C
- * @{
- */
-
-#include "ch.h"
-#include "hal.h"
-
-#if HAL_USE_I2C || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Driver local definitions. */
-/*===========================================================================*/
-
-/*===========================================================================*/
-/* Driver exported variables. */
-/*===========================================================================*/
-
-/** @brief I2C driver identifier.*/
-#if USE_AVR_I2C || defined(__DOXYGEN__)
-I2CDriver I2CD;
-#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(); \
-}
-
-/*===========================================================================*/
-/* Driver interrupt handlers. */
-/*===========================================================================*/
-
-#if USE_AVR_I2C || defined(__DOXYGEN__)
-/**
- * @brief I2C event interrupt handler.
- *
- * @notapi
- */
-CH_IRQ_HANDLER(TWI_vect) {
- CH_IRQ_PROLOGUE();
-
- I2CDriver *i2cp = &I2CD;
-
- switch (TWSR & 0xF8) {
- case TWI_START:
- case TWI_REPEAT_START:
- TWDR = (i2cp->addr << 1);
- if ((i2cp->txbuf == NULL) || (i2cp->txbytes == 0) || (i2cp->txidx == i2cp->txbytes)) {
- TWDR |= 0x01;
- }
- TWCR = ((1 << TWINT) | (1 << TWEN) | (1 << TWIE));
- break;
- case TWI_MASTER_TX_ADDR_ACK:
- case TWI_MASTER_TX_DATA_ACK:
- if (i2cp->txidx < i2cp->txbytes) {
- TWDR = i2cp->txbuf[i2cp->txidx++];
- TWCR = ((1 << TWINT) | (1 << TWEN) | (1 << TWIE));
- } else {
- if (i2cp->rxbuf && i2cp->rxbytes) {
- TWCR = ((1 << TWSTA) | (1 << TWINT) | (1 << TWEN) | (1 << TWIE));
- } else {
- TWCR = ((1 << TWSTO) | (1 << TWINT) | (1 << TWEN));
- wakeup_isr(i2cp, RDY_OK);
- }
- }
- break;
- case TWI_MASTER_RX_ADDR_ACK:
- if (i2cp->rxidx == (i2cp->rxbytes - 1)) {
- TWCR = ((1 << TWINT) | (1 << TWEN) | (1 << TWIE));
- } else {
- TWCR = ((1 << TWEA) | (1 << TWINT) | (1 << TWEN) | (1 << TWIE));
- }
- break;
- case TWI_MASTER_RX_DATA_ACK:
- i2cp->rxbuf[i2cp->rxidx++] = TWDR;
- if (i2cp->rxidx == (i2cp->rxbytes - 1)) {
- TWCR = ((1 << TWINT) | (1 << TWEN) | (1 << TWIE));
- } else {
- TWCR = ((1 << TWEA) | (1 << TWINT) | (1 << TWEN) | (1 << TWIE));
- }
- break;
- case TWI_MASTER_RX_DATA_NACK:
- i2cp->rxbuf[i2cp->rxidx] = TWDR;
- TWCR = ((1 << TWSTO) | (1 << TWINT) | (1 << TWEN));
- wakeup_isr(i2cp, RDY_OK);
- case TWI_MASTER_TX_ADDR_NACK:
- case TWI_MASTER_TX_DATA_NACK:
- case TWI_MASTER_RX_ADDR_NACK:
- i2cp->errors |= I2CD_ACK_FAILURE;
- break;
- case TWI_ARBITRATION_LOST:
- i2cp->errors |= I2CD_ARBITRATION_LOST;
- break;
- case TWI_BUS_ERROR:
- i2cp->errors |= I2CD_BUS_ERROR;
- break;
- default:
- /* FIXME: only gets here if there are other MASTERs in the bus */
- TWCR = ((1 << TWSTO) | (1 << TWINT) | (1 << TWEN));
- wakeup_isr(i2cp, RDY_RESET);
- }
-
- if (i2cp->errors != I2CD_NO_ERROR) {
- TWCR = ((1 << TWSTO) | (1 << TWINT) | (1 << TWEN));
- wakeup_isr(i2cp, RDY_RESET);
- }
-
- CH_IRQ_EPILOGUE();
-}
-#endif /* USE_AVR_I2C */
-
-/*===========================================================================*/
-/* Driver exported functions. */
-/*===========================================================================*/
-
-/**
- * @brief Low level I2C driver initialization.
- *
- * @notapi
- */
-void i2c_lld_init(void) {
- i2cObjectInit(&I2CD);
-}
-
-/**
- * @brief Configures and activates the I2C peripheral.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @notapi
- */
-void i2c_lld_start(I2CDriver *i2cp) {
-
- /* TODO: Test TWI without external pull-ups (use internal) */
-
- /* Configure prescaler to 1 */
- TWSR &= 0xF8;
-
- /* Configure baudrate */
- TWBR = ((F_CPU / i2cp->config->clock_speed) - 16) / 2;
-}
-
-/**
- * @brief Deactivates the I2C peripheral.
- *
- * @param[in] i2cp pointer to the @p I2CDriver object
- *
- * @notapi
- */
-void i2c_lld_stop(I2CDriver *i2cp) {
-
- if (i2cp->state != I2C_STOP) {
- /* Disable TWI subsystem and stop all operations */
- TWCR &= ~(1 << TWEN);
- }
-}
-
-/**
- * @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 the number of ticks before the operation timeouts,
- * the following special values are allowed:
- * - @a TIME_INFINITE no timeout.
- * .
- * @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().
- * @retval RDY_TIMEOUT if a timeout occurred before operation end. <b>After a
- * timeout the driver must be stopped and restarted
- * because the bus is in an uncertain state</b>.
- *
- * @notapi
- */
-msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,
- uint8_t *rxbuf, size_t rxbytes,
- systime_t timeout) {
- i2cp->addr = addr;
- i2cp->txbuf = NULL;
- i2cp->txbytes = 0;
- i2cp->txidx = 0;
- i2cp->rxbuf = rxbuf;
- i2cp->rxbytes = rxbytes;
- i2cp->rxidx = 0;
-
- /* Send START */
- TWCR = ((1 << TWSTA) | (1 << TWINT) | (1 << TWEN) | (1 << TWIE));
-
- chSysLock();
- i2cp->thread = chThdSelf();
- chSchGoSleepS(THD_STATE_SUSPENDED);
- chSysUnlock();
-
- return chThdSelf()->p_u.rdymsg;
-}
-
-/**
- * @brief Transmits data via the I2C bus as master.
- *
- * @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 the number of ticks before the operation timeouts,
- * the following special values are allowed:
- * - @a TIME_INFINITE no timeout.
- * .
- * @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().
- * @retval RDY_TIMEOUT if a timeout occurred before operation end. <b>After a
- * timeout the driver must be stopped and restarted
- * because the bus is in an uncertain state</b>.
- *
- * @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) {
- i2cp->addr = addr;
- i2cp->txbuf = txbuf;
- i2cp->txbytes = txbytes;
- i2cp->txidx = 0;
- i2cp->rxbuf = rxbuf;
- i2cp->rxbytes = rxbytes;
- i2cp->rxidx = 0;
-
- TWCR = ((1 << TWSTA) | (1 << TWINT) | (1 << TWEN) | (1 << TWIE));
-
- chSysLock();
- i2cp->thread = chThdSelf();
- chSchGoSleepS(THD_STATE_SUSPENDED);
- chSysUnlock();
-
- return chThdSelf()->p_u.rdymsg;
-}
-
-#endif /* HAL_USE_I2C */
-
-/** @} */
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