2 * Copyright (c) 2013-2017 ARM Limited. All rights reserved.
4 * SPDX-License-Identifier: Apache-2.0
6 * Licensed under the Apache License, Version 2.0 (the License); you may
7 * not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
14 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
21 * Project: I2C (Inter-Integrated Circuit) Driver definitions
26 * ARM_I2C_STATUS made volatile
28 * Removed function ARM_I2C_MasterTransfer in order to simplify drivers
29 * and added back parameter "xfer_pending" to functions
30 * ARM_I2C_MasterTransmit and ARM_I2C_MasterReceive
32 * Added function ARM_I2C_MasterTransfer and removed parameter "xfer_pending"
33 * from functions ARM_I2C_MasterTransmit and ARM_I2C_MasterReceive
34 * Added function ARM_I2C_GetDataCount
35 * Removed flag "address_nack" from ARM_I2C_STATUS
36 * Replaced events ARM_I2C_EVENT_MASTER_DONE and ARM_I2C_EVENT_SLAVE_DONE
37 * with event ARM_I2C_EVENT_TRANSFER_DONE
38 * Added event ARM_I2C_EVENT_TRANSFER_INCOMPLETE
39 * Removed parameter "arg" from function ARM_I2C_SignalEvent
41 * New simplified driver:
42 * complexity moved to upper layer (especially data handling)
43 * more unified API for different communication interfaces
46 * Changed prefix ARM_DRV -> ARM_DRIVER
48 * Namespace prefix ARM_ added
61 #include "Driver_Common.h"
63 #define ARM_I2C_API_VERSION ARM_DRIVER_VERSION_MAJOR_MINOR(2,3) /* API version */
66 /****** I2C Control Codes *****/
68 #define ARM_I2C_OWN_ADDRESS (0x01) ///< Set Own Slave Address; arg = address
69 #define ARM_I2C_BUS_SPEED (0x02) ///< Set Bus Speed; arg = speed
70 #define ARM_I2C_BUS_CLEAR (0x03) ///< Execute Bus clear: send nine clock pulses
71 #define ARM_I2C_ABORT_TRANSFER (0x04) ///< Abort Master/Slave Transmit/Receive
73 /*----- I2C Bus Speed -----*/
74 #define ARM_I2C_BUS_SPEED_STANDARD (0x01) ///< Standard Speed (100kHz)
75 #define ARM_I2C_BUS_SPEED_FAST (0x02) ///< Fast Speed (400kHz)
76 #define ARM_I2C_BUS_SPEED_FAST_PLUS (0x03) ///< Fast+ Speed ( 1MHz)
77 #define ARM_I2C_BUS_SPEED_HIGH (0x04) ///< High Speed (3.4MHz)
80 /****** I2C Address Flags *****/
82 #define ARM_I2C_ADDRESS_10BIT (0x0400) ///< 10-bit address flag
83 #define ARM_I2C_ADDRESS_GC (0x8000) ///< General Call flag
89 typedef volatile struct _ARM_I2C_STATUS {
90 uint32_t busy : 1; ///< Busy flag
91 uint32_t mode : 1; ///< Mode: 0=Slave, 1=Master
92 uint32_t direction : 1; ///< Direction: 0=Transmitter, 1=Receiver
93 uint32_t general_call : 1; ///< General Call indication (cleared on start of next Slave operation)
94 uint32_t arbitration_lost : 1; ///< Master lost arbitration (cleared on start of next Master operation)
95 uint32_t bus_error : 1; ///< Bus error detected (cleared on start of next Master/Slave operation)
96 uint32_t reserved : 26;
100 /****** I2C Event *****/
101 #define ARM_I2C_EVENT_TRANSFER_DONE (1UL << 0) ///< Master/Slave Transmit/Receive finished
102 #define ARM_I2C_EVENT_TRANSFER_INCOMPLETE (1UL << 1) ///< Master/Slave Transmit/Receive incomplete transfer
103 #define ARM_I2C_EVENT_SLAVE_TRANSMIT (1UL << 2) ///< Slave Transmit operation requested
104 #define ARM_I2C_EVENT_SLAVE_RECEIVE (1UL << 3) ///< Slave Receive operation requested
105 #define ARM_I2C_EVENT_ADDRESS_NACK (1UL << 4) ///< Address not acknowledged from Slave
106 #define ARM_I2C_EVENT_GENERAL_CALL (1UL << 5) ///< General Call indication
107 #define ARM_I2C_EVENT_ARBITRATION_LOST (1UL << 6) ///< Master lost arbitration
108 #define ARM_I2C_EVENT_BUS_ERROR (1UL << 7) ///< Bus error detected (START/STOP at illegal position)
109 #define ARM_I2C_EVENT_BUS_CLEAR (1UL << 8) ///< Bus clear finished
112 // Function documentation
114 \fn ARM_DRIVER_VERSION ARM_I2C_GetVersion (void)
115 \brief Get driver version.
116 \return \ref ARM_DRIVER_VERSION
118 \fn ARM_I2C_CAPABILITIES ARM_I2C_GetCapabilities (void)
119 \brief Get driver capabilities.
120 \return \ref ARM_I2C_CAPABILITIES
122 \fn int32_t ARM_I2C_Initialize (ARM_I2C_SignalEvent_t cb_event)
123 \brief Initialize I2C Interface.
124 \param[in] cb_event Pointer to \ref ARM_I2C_SignalEvent
125 \return \ref execution_status
127 \fn int32_t ARM_I2C_Uninitialize (void)
128 \brief De-initialize I2C Interface.
129 \return \ref execution_status
131 \fn int32_t ARM_I2C_PowerControl (ARM_POWER_STATE state)
132 \brief Control I2C Interface Power.
133 \param[in] state Power state
134 \return \ref execution_status
136 \fn int32_t ARM_I2C_MasterTransmit (uint32_t addr, const uint8_t *data, uint32_t num, bool xfer_pending)
137 \brief Start transmitting data as I2C Master.
138 \param[in] addr Slave address (7-bit or 10-bit)
139 \param[in] data Pointer to buffer with data to transmit to I2C Slave
140 \param[in] num Number of data bytes to transmit
141 \param[in] xfer_pending Transfer operation is pending - Stop condition will not be generated
142 \return \ref execution_status
144 \fn int32_t ARM_I2C_MasterReceive (uint32_t addr, uint8_t *data, uint32_t num, bool xfer_pending)
145 \brief Start receiving data as I2C Master.
146 \param[in] addr Slave address (7-bit or 10-bit)
147 \param[out] data Pointer to buffer for data to receive from I2C Slave
148 \param[in] num Number of data bytes to receive
149 \param[in] xfer_pending Transfer operation is pending - Stop condition will not be generated
150 \return \ref execution_status
152 \fn int32_t ARM_I2C_SlaveTransmit (const uint8_t *data, uint32_t num)
153 \brief Start transmitting data as I2C Slave.
154 \param[in] data Pointer to buffer with data to transmit to I2C Master
155 \param[in] num Number of data bytes to transmit
156 \return \ref execution_status
158 \fn int32_t ARM_I2C_SlaveReceive (uint8_t *data, uint32_t num)
159 \brief Start receiving data as I2C Slave.
160 \param[out] data Pointer to buffer for data to receive from I2C Master
161 \param[in] num Number of data bytes to receive
162 \return \ref execution_status
164 \fn int32_t ARM_I2C_GetDataCount (void)
165 \brief Get transferred data count.
166 \return number of data bytes transferred; -1 when Slave is not addressed by Master
168 \fn int32_t ARM_I2C_Control (uint32_t control, uint32_t arg)
169 \brief Control I2C Interface.
170 \param[in] control Operation
171 \param[in] arg Argument of operation (optional)
172 \return \ref execution_status
174 \fn ARM_I2C_STATUS ARM_I2C_GetStatus (void)
175 \brief Get I2C status.
176 \return I2C status \ref ARM_I2C_STATUS
178 \fn void ARM_I2C_SignalEvent (uint32_t event)
179 \brief Signal I2C Events.
180 \param[in] event \ref I2C_events notification mask
183 typedef void (*ARM_I2C_SignalEvent_t) (uint32_t event); ///< Pointer to \ref ARM_I2C_SignalEvent : Signal I2C Event.
187 \brief I2C Driver Capabilities.
189 typedef struct _ARM_I2C_CAPABILITIES {
190 uint32_t address_10_bit : 1; ///< supports 10-bit addressing
191 uint32_t reserved : 31; ///< Reserved (must be zero)
192 } ARM_I2C_CAPABILITIES;
196 \brief Access structure of the I2C Driver.
198 typedef struct _ARM_DRIVER_I2C {
199 ARM_DRIVER_VERSION (*GetVersion) (void); ///< Pointer to \ref ARM_I2C_GetVersion : Get driver version.
200 ARM_I2C_CAPABILITIES (*GetCapabilities)(void); ///< Pointer to \ref ARM_I2C_GetCapabilities : Get driver capabilities.
201 int32_t (*Initialize) (ARM_I2C_SignalEvent_t cb_event); ///< Pointer to \ref ARM_I2C_Initialize : Initialize I2C Interface.
202 int32_t (*Uninitialize) (void); ///< Pointer to \ref ARM_I2C_Uninitialize : De-initialize I2C Interface.
203 int32_t (*PowerControl) (ARM_POWER_STATE state); ///< Pointer to \ref ARM_I2C_PowerControl : Control I2C Interface Power.
204 int32_t (*MasterTransmit) (uint32_t addr, const uint8_t *data, uint32_t num, bool xfer_pending); ///< Pointer to \ref ARM_I2C_MasterTransmit : Start transmitting data as I2C Master.
205 int32_t (*MasterReceive) (uint32_t addr, uint8_t *data, uint32_t num, bool xfer_pending); ///< Pointer to \ref ARM_I2C_MasterReceive : Start receiving data as I2C Master.
206 int32_t (*SlaveTransmit) ( const uint8_t *data, uint32_t num); ///< Pointer to \ref ARM_I2C_SlaveTransmit : Start transmitting data as I2C Slave.
207 int32_t (*SlaveReceive) ( uint8_t *data, uint32_t num); ///< Pointer to \ref ARM_I2C_SlaveReceive : Start receiving data as I2C Slave.
208 int32_t (*GetDataCount) (void); ///< Pointer to \ref ARM_I2C_GetDataCount : Get transferred data count.
209 int32_t (*Control) (uint32_t control, uint32_t arg); ///< Pointer to \ref ARM_I2C_Control : Control I2C Interface.
210 ARM_I2C_STATUS (*GetStatus) (void); ///< Pointer to \ref ARM_I2C_GetStatus : Get I2C status.
211 } const ARM_DRIVER_I2C;
217 #endif /* DRIVER_I2C_H_ */