diff options
Diffstat (limited to 'os/hal/platforms/LPC122x/i2c_lld.h')
| -rw-r--r-- | os/hal/platforms/LPC122x/i2c_lld.h | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/os/hal/platforms/LPC122x/i2c_lld.h b/os/hal/platforms/LPC122x/i2c_lld.h new file mode 100644 index 000000000..edff13a95 --- /dev/null +++ b/os/hal/platforms/LPC122x/i2c_lld.h @@ -0,0 +1,228 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
+ LPC122x I2C driver - Copyright (C) 2013 Marcin Jokel
+
+ 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 LPC122x/i2c_lld.h
+ * @brief LPC122x I2C subsystem low level driver header.
+ *
+ * @addtogroup I2C
+ * @{
+ */
+
+#ifndef _I2C_LLD_H_
+#define _I2C_LLD_H_
+
+#if HAL_USE_I2C || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants. */
+/*===========================================================================*/
+
+#define I2C_CONSET_AA 0x04 /* Assert acknowledge flag. */
+#define I2C_CONSET_SI 0x08 /* I2C interrupt flag. */
+#define I2C_CONSET_STO 0x10 /* STOP flag. */
+#define I2C_CONSET_STA 0x20 /* START flag. */
+#define I2C_CONSET_EN 0x40 /* I2C interface enable. */
+
+#define I2C_CONCLR_AAC 0x04 /* Assert acknowledge Clear bit. */
+#define I2C_CONCLR_SIC 0x08 /* I2C interrupt Clear bit. */
+#define I2C_CONCLR_STAC 0x20 /* START flag Clear bit. */
+#define I2C_CONCLR_ENC 0x40 /* I2C interface Disable bit. */
+
+#define I2C_WR_BIT 0x00
+#define I2C_RD_BIT 0x01
+
+#define I2C_STATE_MS_START 0x08
+#define I2C_STATE_MS_RSTART 0x10
+#define I2C_STATE_MS_SLAW_ACK 0x18
+#define I2C_STATE_MS_SLAW_NACK 0x20
+#define I2C_STATE_MS_TDAT_ACK 0x28
+#define I2C_STATE_MS_TDAT_NACK 0x30
+#define I2C_STATE_ARB_LOST 0x38
+
+#define I2C_STATE_MS_SLAR_ACK 0x40
+#define I2C_STATE_MS_SLAR_NACK 0x48
+#define I2C_STATE_MS_RDAT_ACK 0x50
+#define I2C_STATE_MS_RDAT_NACK 0x58
+
+#define I2C_STATE_BUS_ERROR 0x00
+
+/*===========================================================================*/
+/* Driver pre-compile time settings. */
+/*===========================================================================*/
+/**
+ * @name Configuration options
+ * @{
+ */
+
+/**
+ * @brief I2C interrupt priority level setting.
+ */
+#if !defined(LPC122x_I2C_IRQ_PRIORITY) || defined(__DOXYGEN__)
+#define LPC122x_I2C_IRQ_PRIORITY 3
+#endif
+
+/** @} */
+
+/*===========================================================================*/
+/* Derived constants and error checks. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver data structures and types. */
+/*===========================================================================*/
+
+/**
+ * @brief Type representing I2C address.
+ */
+typedef uint16_t i2caddr_t;
+
+/**
+ * @brief I2C Driver condition flags type.
+ */
+typedef uint32_t i2cflags_t;
+/**
+ * @brief Supported modes for the I2C bus.
+ */
+typedef enum {
+ I2C_STANDARD_MODE = 1,
+ I2C_FAST_MODE = 2,
+ I2C_FAST_MODE_PLUS = 3
+} i2cmode_t;
+
+/**
+ * @brief Driver configuration structure.
+ */
+typedef struct {
+ i2cmode_t mode; /**< @brief Specifies the I2C mode. */
+ uint32_t clock_timing; /**< @brief Specifies the clock timing */
+} I2CConfig;
+
+/**
+ * @brief Type of a structure representing an I2C driver.
+ */
+typedef struct I2CDriver I2CDriver;
+
+/**
+ * @brief Structure representing an I2C driver.
+ */
+struct I2CDriver {
+ /**
+ * @brief Driver state.
+ */
+ i2cstate_t state;
+ /**
+ * @brief Current configuration data.
+ */
+ const I2CConfig *config;
+ /**
+ * @brief Error flags.
+ */
+ i2cflags_t errors;
+#if I2C_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 /* I2C_USE_MUTUAL_EXCLUSION */
+#if defined(I2C_DRIVER_EXT_FIELDS)
+ I2C_DRIVER_EXT_FIELDS
+#endif
+ /* End of the mandatory fields.*/
+ /**
+ * @brief Thread waiting for I/O completion.
+ */
+ Thread *thread;
+ /**
+ * @brief Current slave address without R/W bit.
+ */
+ i2caddr_t addr;
+ /**
+ * @brief Pointer to the transmit buffer.
+ */
+ const uint8_t *txbuf;
+ /**
+ * @brief Number of bytes to transmit.
+ */
+ size_t txbytes;
+ /**
+ * @brief Pointer to the receive buffer.
+ */
+ uint8_t *rxbuf;
+ /**
+ * @brief Number of bytes to receive.
+ */
+ size_t rxbytes;
+ /**
+ * @brief Pointer to the I2C registers block.
+ */
+ LPC_I2C_Type *i2c;
+};
+
+/*===========================================================================*/
+/* Driver macros. */
+/*===========================================================================*/
+
+/**
+ * @brief Get errors from I2C driver.
+ *
+ * @param[in] i2cp pointer to the @p I2CDriver object
+ *
+ * @notapi
+ */
+#define i2c_lld_get_errors(i2cp) ((i2cp)->errors)
+
+/*===========================================================================*/
+/* External declarations. */
+/*===========================================================================*/
+
+#if !defined(__DOXYGEN__)
+extern I2CDriver I2CD1;
+#endif
+
+#endif /* !defined(__DOXYGEN__) */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ void i2c_lld_init(void);
+ void i2c_lld_start(I2CDriver *i2cp);
+ void i2c_lld_stop(I2CDriver *i2cp);
+ 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);
+ msg_t i2c_lld_master_receive_timeout(I2CDriver *i2cp, i2caddr_t addr,
+ uint8_t *rxbuf, size_t rxbytes,
+ systime_t timeout);
+#ifdef __cplusplus
+}
+#endif
+
+
+
+#endif /* _I2C_LLD_H_ */
+
+/** @} */
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