sai kiran
Watchdog Timer
Fork of
mbed-src
by 
mbed official
targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/i2c_api.c@628:4fa1328d9c60, 2015-09-25 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Sep 25 14:15:10 2015 +0100
- Revision:
- 628:4fa1328d9c60
- Parent:
- 564:536c9fb088a0
Synchronized with git revision fe238a91ab7a4d1d72c4cab9da04967c619d54ad
Full URL: https://github.com/mbedmicro/mbed/commit/fe238a91ab7a4d1d72c4cab9da04967c619d54ad/
Silicon Labs - Add support for low-power async Serial
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| mbed_official | 628:4fa1328d9c60 | 1 | /***************************************************************************//** |
| mbed_official | 628:4fa1328d9c60 | 2 | * @file i2c_api.c |
| mbed_official | 628:4fa1328d9c60 | 3 | ******************************************************************************* |
| mbed_official | 628:4fa1328d9c60 | 4 | * @section License |
| mbed_official | 628:4fa1328d9c60 | 5 | * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> |
| mbed_official | 628:4fa1328d9c60 | 6 | ******************************************************************************* |
| mbed_official | 525:c320967f86b9 | 7 | * |
| mbed_official | 628:4fa1328d9c60 | 8 | * Permission is granted to anyone to use this software for any purpose, |
| mbed_official | 628:4fa1328d9c60 | 9 | * including commercial applications, and to alter it and redistribute it |
| mbed_official | 628:4fa1328d9c60 | 10 | * freely, subject to the following restrictions: |
| mbed_official | 525:c320967f86b9 | 11 | * |
| mbed_official | 628:4fa1328d9c60 | 12 | * 1. The origin of this software must not be misrepresented; you must not |
| mbed_official | 628:4fa1328d9c60 | 13 | * claim that you wrote the original software. |
| mbed_official | 628:4fa1328d9c60 | 14 | * 2. Altered source versions must be plainly marked as such, and must not be |
| mbed_official | 628:4fa1328d9c60 | 15 | * misrepresented as being the original software. |
| mbed_official | 628:4fa1328d9c60 | 16 | * 3. This notice may not be removed or altered from any source distribution. |
| mbed_official | 525:c320967f86b9 | 17 | * |
| mbed_official | 628:4fa1328d9c60 | 18 | * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no |
| mbed_official | 628:4fa1328d9c60 | 19 | * obligation to support this Software. Silicon Labs is providing the |
| mbed_official | 628:4fa1328d9c60 | 20 | * Software "AS IS", with no express or implied warranties of any kind, |
| mbed_official | 628:4fa1328d9c60 | 21 | * including, but not limited to, any implied warranties of merchantability |
| mbed_official | 628:4fa1328d9c60 | 22 | * or fitness for any particular purpose or warranties against infringement |
| mbed_official | 628:4fa1328d9c60 | 23 | * of any proprietary rights of a third party. |
| mbed_official | 628:4fa1328d9c60 | 24 | * |
| mbed_official | 628:4fa1328d9c60 | 25 | * Silicon Labs will not be liable for any consequential, incidental, or |
| mbed_official | 628:4fa1328d9c60 | 26 | * special damages, or any other relief, or for any claim by any third party, |
| mbed_official | 628:4fa1328d9c60 | 27 | * arising from your use of this Software. |
| mbed_official | 628:4fa1328d9c60 | 28 | * |
| mbed_official | 628:4fa1328d9c60 | 29 | ******************************************************************************/ |
| mbed_official | 525:c320967f86b9 | 30 | |
| mbed_official | 525:c320967f86b9 | 31 | #include "device.h" |
| mbed_official | 525:c320967f86b9 | 32 | #include "clocking.h" |
| mbed_official | 525:c320967f86b9 | 33 | #include <stdio.h> |
| mbed_official | 525:c320967f86b9 | 34 | |
| mbed_official | 525:c320967f86b9 | 35 | #if DEVICE_I2C |
| mbed_official | 525:c320967f86b9 | 36 | |
| mbed_official | 525:c320967f86b9 | 37 | #include "mbed_assert.h" |
| mbed_official | 525:c320967f86b9 | 38 | #include "i2c_api.h" |
| mbed_official | 525:c320967f86b9 | 39 | #include "PeripheralPins.h" |
| mbed_official | 525:c320967f86b9 | 40 | #include "pinmap_function.h" |
| mbed_official | 526:7c4bdfe6a168 | 41 | #include "sleepmodes.h" |
| mbed_official | 525:c320967f86b9 | 42 | |
| mbed_official | 525:c320967f86b9 | 43 | #include "em_i2c.h" |
| mbed_official | 525:c320967f86b9 | 44 | #include "em_cmu.h" |
| mbed_official | 525:c320967f86b9 | 45 | |
| mbed_official | 525:c320967f86b9 | 46 | /** Error flags indicating I2C transfer has failed somehow. */ |
| mbed_official | 525:c320967f86b9 | 47 | /* Notice that I2C_IF_TXOF (transmit overflow) is not really possible with */ |
| mbed_official | 525:c320967f86b9 | 48 | /* this SW supporting master mode. Likewise for I2C_IF_RXUF (receive underflow) */ |
| mbed_official | 525:c320967f86b9 | 49 | /* RXUF is only likely to occur with this SW if using a debugger peeking into */ |
| mbed_official | 525:c320967f86b9 | 50 | /* RXDATA register. Thus, we ignore those types of fault. */ |
| mbed_official | 525:c320967f86b9 | 51 | #define I2C_IF_ERRORS (I2C_IF_BUSERR | I2C_IF_ARBLOST) |
| mbed_official | 525:c320967f86b9 | 52 | #define I2C_TIMEOUT 100000 |
| mbed_official | 525:c320967f86b9 | 53 | |
| mbed_official | 525:c320967f86b9 | 54 | /* Prototypes */ |
| mbed_official | 525:c320967f86b9 | 55 | int block_and_wait_for_ack(I2C_TypeDef *i2c); |
| mbed_official | 525:c320967f86b9 | 56 | void i2c_enable(i2c_t *obj, uint8_t enable); |
| mbed_official | 525:c320967f86b9 | 57 | void i2c_enable_pins(i2c_t *obj, uint8_t enable); |
| mbed_official | 525:c320967f86b9 | 58 | void i2c_enable_interrupt(i2c_t *obj, uint32_t address, uint8_t enable); |
| mbed_official | 525:c320967f86b9 | 59 | |
| mbed_official | 525:c320967f86b9 | 60 | static uint8_t i2c_get_index(i2c_t *obj) |
| mbed_official | 525:c320967f86b9 | 61 | { |
| mbed_official | 525:c320967f86b9 | 62 | uint8_t index = 0; |
| mbed_official | 525:c320967f86b9 | 63 | switch ((int)obj->i2c.i2c) { |
| mbed_official | 525:c320967f86b9 | 64 | #ifdef I2C0 |
| mbed_official | 525:c320967f86b9 | 65 | case I2C_0: |
| mbed_official | 525:c320967f86b9 | 66 | index = 0; |
| mbed_official | 525:c320967f86b9 | 67 | break; |
| mbed_official | 525:c320967f86b9 | 68 | #endif |
| mbed_official | 525:c320967f86b9 | 69 | #ifdef I2C1 |
| mbed_official | 525:c320967f86b9 | 70 | case I2C_1: |
| mbed_official | 525:c320967f86b9 | 71 | index = 1; |
| mbed_official | 525:c320967f86b9 | 72 | break; |
| mbed_official | 525:c320967f86b9 | 73 | #endif |
| mbed_official | 525:c320967f86b9 | 74 | default: |
| mbed_official | 525:c320967f86b9 | 75 | printf("I2C module not available.. Out of bound access."); |
| mbed_official | 525:c320967f86b9 | 76 | break; |
| mbed_official | 525:c320967f86b9 | 77 | } |
| mbed_official | 525:c320967f86b9 | 78 | return index; |
| mbed_official | 525:c320967f86b9 | 79 | } |
| mbed_official | 525:c320967f86b9 | 80 | |
| mbed_official | 525:c320967f86b9 | 81 | static CMU_Clock_TypeDef i2c_get_clock(i2c_t *obj) |
| mbed_official | 525:c320967f86b9 | 82 | { |
| mbed_official | 525:c320967f86b9 | 83 | CMU_Clock_TypeDef clock; |
| mbed_official | 525:c320967f86b9 | 84 | switch ((int)obj->i2c.i2c) { |
| mbed_official | 525:c320967f86b9 | 85 | #ifdef I2C0 |
| mbed_official | 525:c320967f86b9 | 86 | case I2C_0: |
| mbed_official | 525:c320967f86b9 | 87 | clock = cmuClock_I2C0; |
| mbed_official | 525:c320967f86b9 | 88 | break; |
| mbed_official | 525:c320967f86b9 | 89 | #endif |
| mbed_official | 525:c320967f86b9 | 90 | #ifdef I2C1 |
| mbed_official | 525:c320967f86b9 | 91 | case I2C_1: |
| mbed_official | 548:1abac31e188e | 92 | clock = cmuClock_I2C1; |
| mbed_official | 525:c320967f86b9 | 93 | break; |
| mbed_official | 525:c320967f86b9 | 94 | #endif |
| mbed_official | 525:c320967f86b9 | 95 | default: |
| mbed_official | 525:c320967f86b9 | 96 | printf("I2C module not available.. Out of bound access. (clock)"); |
| mbed_official | 525:c320967f86b9 | 97 | clock = cmuClock_HFPER; |
| mbed_official | 525:c320967f86b9 | 98 | break; |
| mbed_official | 525:c320967f86b9 | 99 | } |
| mbed_official | 525:c320967f86b9 | 100 | return clock; |
| mbed_official | 525:c320967f86b9 | 101 | } |
| mbed_official | 525:c320967f86b9 | 102 | |
| mbed_official | 525:c320967f86b9 | 103 | void i2c_preinit(i2c_t *obj, PinName sda, PinName scl) |
| mbed_official | 525:c320967f86b9 | 104 | { |
| mbed_official | 525:c320967f86b9 | 105 | I2CName i2c_sda = (I2CName) pinmap_peripheral(sda, PinMap_I2C_SDA); |
| mbed_official | 525:c320967f86b9 | 106 | I2CName i2c_scl = (I2CName) pinmap_peripheral(scl, PinMap_I2C_SCL); |
| mbed_official | 525:c320967f86b9 | 107 | obj->i2c.i2c = (I2C_TypeDef*) pinmap_merge(i2c_sda, i2c_scl); |
| mbed_official | 525:c320967f86b9 | 108 | MBED_ASSERT(((int) obj->i2c.i2c) != NC); |
| mbed_official | 525:c320967f86b9 | 109 | |
| mbed_official | 525:c320967f86b9 | 110 | int loc_sda = pin_location(sda, PinMap_I2C_SDA); |
| mbed_official | 525:c320967f86b9 | 111 | int loc_scl = pin_location(scl, PinMap_I2C_SCL); |
| mbed_official | 525:c320967f86b9 | 112 | obj->i2c.loc = pinmap_merge(loc_sda, loc_scl); |
| mbed_official | 525:c320967f86b9 | 113 | MBED_ASSERT(obj->i2c.loc != NC); |
| mbed_official | 525:c320967f86b9 | 114 | obj->i2c.sda = sda; |
| mbed_official | 525:c320967f86b9 | 115 | obj->i2c.scl = scl; |
| mbed_official | 525:c320967f86b9 | 116 | } |
| mbed_official | 525:c320967f86b9 | 117 | |
| mbed_official | 525:c320967f86b9 | 118 | void i2c_init(i2c_t *obj, PinName sda, PinName scl) |
| mbed_official | 525:c320967f86b9 | 119 | { |
| mbed_official | 525:c320967f86b9 | 120 | /* Assign mbed pins */ |
| mbed_official | 548:1abac31e188e | 121 | i2c_preinit(obj, sda, scl); |
| mbed_official | 525:c320967f86b9 | 122 | |
| mbed_official | 548:1abac31e188e | 123 | /* Enable clock for the peripheral */ |
| mbed_official | 548:1abac31e188e | 124 | CMU_ClockEnable(i2c_get_clock(obj), true); |
| mbed_official | 525:c320967f86b9 | 125 | |
| mbed_official | 525:c320967f86b9 | 126 | /* Initializing the I2C */ |
| mbed_official | 525:c320967f86b9 | 127 | /* Using default settings */ |
| mbed_official | 525:c320967f86b9 | 128 | I2C_Init_TypeDef i2cInit = I2C_INIT_DEFAULT; |
| mbed_official | 525:c320967f86b9 | 129 | I2C_Init(obj->i2c.i2c, &i2cInit); |
| mbed_official | 525:c320967f86b9 | 130 | |
| mbed_official | 525:c320967f86b9 | 131 | /* Enable pins at correct location */ |
| mbed_official | 525:c320967f86b9 | 132 | obj->i2c.i2c->ROUTE = I2C_ROUTE_SDAPEN | I2C_ROUTE_SCLPEN | (obj->i2c.loc << _I2C_ROUTE_LOCATION_SHIFT); |
| mbed_official | 525:c320967f86b9 | 133 | i2c_enable_pins(obj, true); |
| mbed_official | 525:c320967f86b9 | 134 | |
| mbed_official | 525:c320967f86b9 | 135 | /* Enable General Call Address Mode. That is; we respond to the general address (0x0) */ |
| mbed_official | 525:c320967f86b9 | 136 | obj->i2c.i2c->CTRL |= _I2C_CTRL_GCAMEN_MASK; |
| mbed_official | 525:c320967f86b9 | 137 | |
| mbed_official | 525:c320967f86b9 | 138 | /* We are assuming that there is only one master. So disable automatic arbitration */ |
| mbed_official | 525:c320967f86b9 | 139 | obj->i2c.i2c->CTRL |= _I2C_CTRL_ARBDIS_MASK; |
| mbed_official | 525:c320967f86b9 | 140 | |
| mbed_official | 525:c320967f86b9 | 141 | /* Enable i2c */ |
| mbed_official | 525:c320967f86b9 | 142 | i2c_enable(obj, true); |
| mbed_official | 525:c320967f86b9 | 143 | } |
| mbed_official | 525:c320967f86b9 | 144 | |
| mbed_official | 525:c320967f86b9 | 145 | void i2c_enable(i2c_t *obj, uint8_t enable) |
| mbed_official | 525:c320967f86b9 | 146 | { |
| mbed_official | 525:c320967f86b9 | 147 | I2C_Enable(obj->i2c.i2c, enable); |
| mbed_official | 525:c320967f86b9 | 148 | if (!enable) { |
| mbed_official | 525:c320967f86b9 | 149 | /* After a reset BUSY is usually set. We assume that we are the only master and call abort, |
| mbed_official | 525:c320967f86b9 | 150 | * which sends nothing on the bus, it just allows us to assume that the bus is idle */ |
| mbed_official | 525:c320967f86b9 | 151 | if (obj->i2c.i2c->STATE & I2C_STATE_BUSY) { |
| mbed_official | 525:c320967f86b9 | 152 | obj->i2c.i2c->CMD = I2C_CMD_ABORT; |
| mbed_official | 525:c320967f86b9 | 153 | } |
| mbed_official | 548:1abac31e188e | 154 | |
| mbed_official | 525:c320967f86b9 | 155 | } |
| mbed_official | 525:c320967f86b9 | 156 | } |
| mbed_official | 525:c320967f86b9 | 157 | |
| mbed_official | 525:c320967f86b9 | 158 | void i2c_enable_pins(i2c_t *obj, uint8_t enable) |
| mbed_official | 525:c320967f86b9 | 159 | { |
| mbed_official | 525:c320967f86b9 | 160 | if (enable) { |
| mbed_official | 525:c320967f86b9 | 161 | pin_mode(obj->i2c.scl, WiredAndPullUp); |
| mbed_official | 525:c320967f86b9 | 162 | pin_mode(obj->i2c.sda, WiredAndPullUp); |
| mbed_official | 525:c320967f86b9 | 163 | } else { |
| mbed_official | 525:c320967f86b9 | 164 | // TODO_LP return PinMode to the previous state |
| mbed_official | 525:c320967f86b9 | 165 | pin_mode(obj->i2c.sda, Disabled); |
| mbed_official | 525:c320967f86b9 | 166 | pin_mode(obj->i2c.scl, Disabled); |
| mbed_official | 525:c320967f86b9 | 167 | } |
| mbed_official | 525:c320967f86b9 | 168 | } |
| mbed_official | 525:c320967f86b9 | 169 | |
| mbed_official | 525:c320967f86b9 | 170 | void i2c_enable_interrupt(i2c_t *obj, uint32_t address, uint8_t enable) |
| mbed_official | 525:c320967f86b9 | 171 | { |
| mbed_official | 525:c320967f86b9 | 172 | IRQn_Type irq_number; |
| mbed_official | 525:c320967f86b9 | 173 | |
| mbed_official | 525:c320967f86b9 | 174 | switch (i2c_get_index(obj)) { |
| mbed_official | 525:c320967f86b9 | 175 | #ifdef I2C0 |
| mbed_official | 525:c320967f86b9 | 176 | case 0: |
| mbed_official | 525:c320967f86b9 | 177 | irq_number = I2C0_IRQn; |
| mbed_official | 525:c320967f86b9 | 178 | break; |
| mbed_official | 525:c320967f86b9 | 179 | #endif |
| mbed_official | 525:c320967f86b9 | 180 | #ifdef I2C1 |
| mbed_official | 525:c320967f86b9 | 181 | case 1: |
| mbed_official | 525:c320967f86b9 | 182 | irq_number = I2C1_IRQn; |
| mbed_official | 525:c320967f86b9 | 183 | break; |
| mbed_official | 525:c320967f86b9 | 184 | #endif |
| mbed_official | 525:c320967f86b9 | 185 | } |
| mbed_official | 525:c320967f86b9 | 186 | |
| mbed_official | 525:c320967f86b9 | 187 | NVIC_SetVector(irq_number, address); |
| mbed_official | 525:c320967f86b9 | 188 | /* Lower IRQ priority to avoid messing with asynch RX on UART */ |
| mbed_official | 525:c320967f86b9 | 189 | NVIC_SetPriority(irq_number, 1); |
| mbed_official | 525:c320967f86b9 | 190 | if (enable) { |
| mbed_official | 525:c320967f86b9 | 191 | NVIC_EnableIRQ(irq_number); |
| mbed_official | 525:c320967f86b9 | 192 | } else { |
| mbed_official | 525:c320967f86b9 | 193 | NVIC_DisableIRQ(irq_number); |
| mbed_official | 525:c320967f86b9 | 194 | } |
| mbed_official | 525:c320967f86b9 | 195 | } |
| mbed_official | 525:c320967f86b9 | 196 | |
| mbed_official | 525:c320967f86b9 | 197 | /* Set the frequency of the I2C interface */ |
| mbed_official | 525:c320967f86b9 | 198 | void i2c_frequency(i2c_t *obj, int hz) |
| mbed_official | 525:c320967f86b9 | 199 | { |
| mbed_official | 525:c320967f86b9 | 200 | /* Set frequency. As the second argument is 0, |
| mbed_official | 525:c320967f86b9 | 201 | * HFPER clock frequency is used as reference freq */ |
| mbed_official | 525:c320967f86b9 | 202 | I2C_BusFreqSet(obj->i2c.i2c, REFERENCE_FREQUENCY, hz, i2cClockHLRStandard); |
| mbed_official | 525:c320967f86b9 | 203 | } |
| mbed_official | 525:c320967f86b9 | 204 | |
| mbed_official | 525:c320967f86b9 | 205 | /* Creates a start condition on the I2C bus */ |
| mbed_official | 525:c320967f86b9 | 206 | int i2c_start(i2c_t *obj) |
| mbed_official | 525:c320967f86b9 | 207 | { |
| mbed_official | 525:c320967f86b9 | 208 | I2C_TypeDef *i2c = obj->i2c.i2c; |
| mbed_official | 525:c320967f86b9 | 209 | |
| mbed_official | 525:c320967f86b9 | 210 | /* Ensure buffers are empty */ |
| mbed_official | 525:c320967f86b9 | 211 | i2c->CMD = I2C_CMD_CLEARPC | I2C_CMD_CLEARTX; |
| mbed_official | 525:c320967f86b9 | 212 | if (i2c->IF & I2C_IF_RXDATAV) { |
| mbed_official | 525:c320967f86b9 | 213 | (void) i2c->RXDATA; |
| mbed_official | 525:c320967f86b9 | 214 | } |
| mbed_official | 525:c320967f86b9 | 215 | |
| mbed_official | 525:c320967f86b9 | 216 | /* Clear all pending interrupts prior to starting transfer. */ |
| mbed_official | 525:c320967f86b9 | 217 | i2c->IFC = _I2C_IFC_MASK; |
| mbed_official | 525:c320967f86b9 | 218 | |
| mbed_official | 525:c320967f86b9 | 219 | /* Send start */ |
| mbed_official | 525:c320967f86b9 | 220 | obj->i2c.i2c->CMD = I2C_CMD_START; |
| mbed_official | 525:c320967f86b9 | 221 | return 0; |
| mbed_official | 525:c320967f86b9 | 222 | } |
| mbed_official | 525:c320967f86b9 | 223 | |
| mbed_official | 525:c320967f86b9 | 224 | /* Creates a stop condition on the I2C bus */ |
| mbed_official | 525:c320967f86b9 | 225 | int i2c_stop(i2c_t *obj) |
| mbed_official | 525:c320967f86b9 | 226 | { |
| mbed_official | 525:c320967f86b9 | 227 | obj->i2c.i2c->CMD = I2C_CMD_STOP; |
| mbed_official | 525:c320967f86b9 | 228 | |
| mbed_official | 525:c320967f86b9 | 229 | /* Wait for the stop to be sent */ |
| mbed_official | 525:c320967f86b9 | 230 | int timeout = I2C_TIMEOUT; |
| mbed_official | 525:c320967f86b9 | 231 | while (!(obj->i2c.i2c->IF & I2C_IF_MSTOP) && !timeout--); |
| mbed_official | 525:c320967f86b9 | 232 | |
| mbed_official | 525:c320967f86b9 | 233 | return 0; |
| mbed_official | 525:c320967f86b9 | 234 | } |
| mbed_official | 525:c320967f86b9 | 235 | |
| mbed_official | 525:c320967f86b9 | 236 | /* Returns number of bytes read */ |
| mbed_official | 525:c320967f86b9 | 237 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) |
| mbed_official | 525:c320967f86b9 | 238 | { |
| mbed_official | 548:1abac31e188e | 239 | int retval; |
| mbed_official | 525:c320967f86b9 | 240 | |
| mbed_official | 525:c320967f86b9 | 241 | i2c_start(obj); |
| mbed_official | 525:c320967f86b9 | 242 | |
| mbed_official | 525:c320967f86b9 | 243 | retval = i2c_byte_write(obj, (address | 1)); |
| mbed_official | 525:c320967f86b9 | 244 | if ((!retval) || (length == 0)) { //Write address with W flag (last bit 1) |
| mbed_official | 548:1abac31e188e | 245 | obj->i2c.i2c->CMD = I2C_CMD_STOP | I2C_CMD_ABORT; |
| mbed_official | 548:1abac31e188e | 246 | while(obj->i2c.i2c->STATE & I2C_STATE_BUSY); // Wait until the bus is done |
| mbed_official | 525:c320967f86b9 | 247 | return (retval == 0 ? I2C_ERROR_NO_SLAVE : 0); //NACK or error when writing adress. Return 0 as 0 bytes were read |
| mbed_official | 525:c320967f86b9 | 248 | } |
| mbed_official | 525:c320967f86b9 | 249 | int i = 0; |
| mbed_official | 525:c320967f86b9 | 250 | while (i < length) { |
| mbed_official | 525:c320967f86b9 | 251 | uint8_t last = (i == length - 1); |
| mbed_official | 525:c320967f86b9 | 252 | data[i++] = i2c_byte_read(obj, last); |
| mbed_official | 525:c320967f86b9 | 253 | } |
| mbed_official | 525:c320967f86b9 | 254 | |
| mbed_official | 525:c320967f86b9 | 255 | if (stop) { |
| mbed_official | 525:c320967f86b9 | 256 | i2c_stop(obj); |
| mbed_official | 525:c320967f86b9 | 257 | } |
| mbed_official | 525:c320967f86b9 | 258 | |
| mbed_official | 525:c320967f86b9 | 259 | return length; |
| mbed_official | 525:c320967f86b9 | 260 | } |
| mbed_official | 525:c320967f86b9 | 261 | |
| mbed_official | 525:c320967f86b9 | 262 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) |
| mbed_official | 525:c320967f86b9 | 263 | { |
| mbed_official | 525:c320967f86b9 | 264 | i2c_start(obj); |
| mbed_official | 525:c320967f86b9 | 265 | |
| mbed_official | 525:c320967f86b9 | 266 | if (!i2c_byte_write(obj, (address & 0xFE))) { |
| mbed_official | 525:c320967f86b9 | 267 | i2c_stop(obj); |
| mbed_official | 525:c320967f86b9 | 268 | return I2C_ERROR_NO_SLAVE; //NACK or error when writing adress. Return 0 as 0 bytes were written |
| mbed_official | 525:c320967f86b9 | 269 | } |
| mbed_official | 525:c320967f86b9 | 270 | int i; |
| mbed_official | 525:c320967f86b9 | 271 | for (i = 0; i < length; i++) { |
| mbed_official | 525:c320967f86b9 | 272 | if (!i2c_byte_write(obj, data[i])) { |
| mbed_official | 525:c320967f86b9 | 273 | i2c_stop(obj); |
| mbed_official | 525:c320967f86b9 | 274 | return i; |
| mbed_official | 525:c320967f86b9 | 275 | } |
| mbed_official | 525:c320967f86b9 | 276 | } |
| mbed_official | 525:c320967f86b9 | 277 | |
| mbed_official | 525:c320967f86b9 | 278 | if (stop) { |
| mbed_official | 525:c320967f86b9 | 279 | i2c_stop(obj); |
| mbed_official | 525:c320967f86b9 | 280 | } |
| mbed_official | 525:c320967f86b9 | 281 | |
| mbed_official | 525:c320967f86b9 | 282 | return length; |
| mbed_official | 525:c320967f86b9 | 283 | } |
| mbed_official | 525:c320967f86b9 | 284 | |
| mbed_official | 525:c320967f86b9 | 285 | void i2c_reset(i2c_t *obj) |
| mbed_official | 525:c320967f86b9 | 286 | { |
| mbed_official | 525:c320967f86b9 | 287 | /* EMLib function */ |
| mbed_official | 525:c320967f86b9 | 288 | I2C_Reset(obj->i2c.i2c); |
| mbed_official | 525:c320967f86b9 | 289 | } |
| mbed_official | 525:c320967f86b9 | 290 | |
| mbed_official | 525:c320967f86b9 | 291 | int i2c_byte_read(i2c_t *obj, int last) |
| mbed_official | 525:c320967f86b9 | 292 | { |
| mbed_official | 525:c320967f86b9 | 293 | int timeout = I2C_TIMEOUT; |
| mbed_official | 525:c320967f86b9 | 294 | /* Wait for data */ |
| mbed_official | 525:c320967f86b9 | 295 | while (!(obj->i2c.i2c->STATUS & I2C_STATUS_RXDATAV) && timeout--); |
| mbed_official | 525:c320967f86b9 | 296 | |
| mbed_official | 525:c320967f86b9 | 297 | if (timeout <= 0) { |
| mbed_official | 525:c320967f86b9 | 298 | return 0; //TODO Is this the correct way to handle this? |
| mbed_official | 525:c320967f86b9 | 299 | } |
| mbed_official | 525:c320967f86b9 | 300 | char data = obj->i2c.i2c->RXDATA; |
| mbed_official | 525:c320967f86b9 | 301 | |
| mbed_official | 525:c320967f86b9 | 302 | if (last) { |
| mbed_official | 525:c320967f86b9 | 303 | obj->i2c.i2c->CMD = I2C_CMD_NACK; |
| mbed_official | 525:c320967f86b9 | 304 | } else { |
| mbed_official | 525:c320967f86b9 | 305 | obj->i2c.i2c->CMD = I2C_CMD_ACK; |
| mbed_official | 525:c320967f86b9 | 306 | } |
| mbed_official | 525:c320967f86b9 | 307 | return data; |
| mbed_official | 525:c320967f86b9 | 308 | } |
| mbed_official | 525:c320967f86b9 | 309 | |
| mbed_official | 525:c320967f86b9 | 310 | int i2c_byte_write(i2c_t *obj, int data) |
| mbed_official | 525:c320967f86b9 | 311 | { |
| mbed_official | 525:c320967f86b9 | 312 | obj->i2c.i2c->TXDATA = data; |
| mbed_official | 525:c320967f86b9 | 313 | return block_and_wait_for_ack(obj->i2c.i2c); |
| mbed_official | 525:c320967f86b9 | 314 | } |
| mbed_official | 525:c320967f86b9 | 315 | |
| mbed_official | 525:c320967f86b9 | 316 | /* |
| mbed_official | 525:c320967f86b9 | 317 | * Returns 1 for ACK. 0 for NACK, timeout or error. |
| mbed_official | 525:c320967f86b9 | 318 | */ |
| mbed_official | 525:c320967f86b9 | 319 | int block_and_wait_for_ack(I2C_TypeDef *i2c) |
| mbed_official | 525:c320967f86b9 | 320 | { |
| mbed_official | 525:c320967f86b9 | 321 | uint32_t pending; |
| mbed_official | 525:c320967f86b9 | 322 | uint32_t timeout = I2C_TIMEOUT; |
| mbed_official | 525:c320967f86b9 | 323 | while (timeout > 0) { |
| mbed_official | 525:c320967f86b9 | 324 | timeout -= 1; |
| mbed_official | 525:c320967f86b9 | 325 | pending = i2c->IF; |
| mbed_official | 525:c320967f86b9 | 326 | /* If some sort of fault, abort transfer. */ |
| mbed_official | 525:c320967f86b9 | 327 | if (pending & I2C_IF_ERRORS) { |
| mbed_official | 525:c320967f86b9 | 328 | if (pending & I2C_IF_ARBLOST) { |
| mbed_official | 525:c320967f86b9 | 329 | /* If arbitration fault, it indicates either a slave device */ |
| mbed_official | 525:c320967f86b9 | 330 | /* not responding as expected, or other master which is not */ |
| mbed_official | 525:c320967f86b9 | 331 | /* supported by this SW. */ |
| mbed_official | 525:c320967f86b9 | 332 | return 0; |
| mbed_official | 525:c320967f86b9 | 333 | } else if (pending & I2C_IF_BUSERR) { |
| mbed_official | 525:c320967f86b9 | 334 | /* A bus error indicates a misplaced start or stop, which should */ |
| mbed_official | 525:c320967f86b9 | 335 | /* not occur in master mode controlled by this SW. */ |
| mbed_official | 525:c320967f86b9 | 336 | return 0; |
| mbed_official | 525:c320967f86b9 | 337 | } |
| mbed_official | 525:c320967f86b9 | 338 | } |
| mbed_official | 525:c320967f86b9 | 339 | |
| mbed_official | 525:c320967f86b9 | 340 | if (pending & I2C_IF_NACK) { |
| mbed_official | 525:c320967f86b9 | 341 | i2c->IFC = I2C_IFC_NACK; |
| mbed_official | 525:c320967f86b9 | 342 | return 0; //Received NACK |
| mbed_official | 525:c320967f86b9 | 343 | } else if (pending & I2C_IF_ACK) { |
| mbed_official | 525:c320967f86b9 | 344 | i2c->IFC = I2C_IFC_ACK; |
| mbed_official | 525:c320967f86b9 | 345 | return 1; //Got ACK |
| mbed_official | 525:c320967f86b9 | 346 | } |
| mbed_official | 525:c320967f86b9 | 347 | } |
| mbed_official | 525:c320967f86b9 | 348 | return 0; //Timeout |
| mbed_official | 525:c320967f86b9 | 349 | } |
| mbed_official | 525:c320967f86b9 | 350 | |
| mbed_official | 525:c320967f86b9 | 351 | #if DEVICE_I2CSLAVE |
| mbed_official | 525:c320967f86b9 | 352 | |
| mbed_official | 525:c320967f86b9 | 353 | #define NoData 0 |
| mbed_official | 525:c320967f86b9 | 354 | #define ReadAddressed 1 |
| mbed_official | 525:c320967f86b9 | 355 | #define WriteGeneral 2 |
| mbed_official | 525:c320967f86b9 | 356 | #define WriteAddressed 3 |
| mbed_official | 525:c320967f86b9 | 357 | |
| mbed_official | 525:c320967f86b9 | 358 | |
| mbed_official | 525:c320967f86b9 | 359 | void i2c_slave_mode(i2c_t *obj, int enable_slave) |
| mbed_official | 525:c320967f86b9 | 360 | { |
| mbed_official | 548:1abac31e188e | 361 | if(enable_slave) { |
| mbed_official | 525:c320967f86b9 | 362 | obj->i2c.i2c->CTRL |= _I2C_CTRL_SLAVE_MASK; |
| mbed_official | 525:c320967f86b9 | 363 | obj->i2c.i2c->CTRL |= _I2C_CTRL_AUTOACK_MASK; //Slave implementation assumes auto acking |
| mbed_official | 548:1abac31e188e | 364 | } else { |
| mbed_official | 525:c320967f86b9 | 365 | obj->i2c.i2c->CTRL &= ~_I2C_CTRL_SLAVE_MASK; |
| mbed_official | 525:c320967f86b9 | 366 | obj->i2c.i2c->CTRL &= ~_I2C_CTRL_AUTOACK_MASK; //Master implementation ACKs manually |
| mbed_official | 525:c320967f86b9 | 367 | } |
| mbed_official | 525:c320967f86b9 | 368 | } |
| mbed_official | 525:c320967f86b9 | 369 | |
| mbed_official | 525:c320967f86b9 | 370 | int i2c_slave_receive(i2c_t *obj) |
| mbed_official | 525:c320967f86b9 | 371 | { |
| mbed_official | 525:c320967f86b9 | 372 | |
| mbed_official | 548:1abac31e188e | 373 | if(obj->i2c.i2c->IF & I2C_IF_ADDR) { |
| mbed_official | 525:c320967f86b9 | 374 | obj->i2c.i2c->IFC = I2C_IF_ADDR; //Clear interrupt |
| mbed_official | 525:c320967f86b9 | 375 | /*0x00 is the address for general write. |
| mbed_official | 525:c320967f86b9 | 376 | The address the master wrote is in RXDATA now |
| mbed_official | 525:c320967f86b9 | 377 | and reading it also frees the buffer for the next |
| mbed_official | 525:c320967f86b9 | 378 | write which can then be acked. */ |
| mbed_official | 548:1abac31e188e | 379 | if(obj->i2c.i2c->RXDATA == 0x00) { |
| mbed_official | 525:c320967f86b9 | 380 | return WriteGeneral; //Read the address; |
| mbed_official | 525:c320967f86b9 | 381 | } |
| mbed_official | 525:c320967f86b9 | 382 | |
| mbed_official | 548:1abac31e188e | 383 | if(obj->i2c.i2c->STATE & I2C_STATE_TRANSMITTER) { |
| mbed_official | 525:c320967f86b9 | 384 | return ReadAddressed; |
| mbed_official | 548:1abac31e188e | 385 | } else { |
| mbed_official | 525:c320967f86b9 | 386 | return WriteAddressed; |
| mbed_official | 525:c320967f86b9 | 387 | } |
| mbed_official | 525:c320967f86b9 | 388 | } |
| mbed_official | 525:c320967f86b9 | 389 | |
| mbed_official | 525:c320967f86b9 | 390 | return NoData; |
| mbed_official | 525:c320967f86b9 | 391 | |
| mbed_official | 525:c320967f86b9 | 392 | } |
| mbed_official | 525:c320967f86b9 | 393 | |
| mbed_official | 525:c320967f86b9 | 394 | int i2c_slave_read(i2c_t *obj, char *data, int length) |
| mbed_official | 525:c320967f86b9 | 395 | { |
| mbed_official | 525:c320967f86b9 | 396 | int count; |
| mbed_official | 525:c320967f86b9 | 397 | for (count = 0; count < length; count++) { |
| mbed_official | 525:c320967f86b9 | 398 | data[count] = i2c_byte_read(obj, 0); |
| mbed_official | 525:c320967f86b9 | 399 | } |
| mbed_official | 548:1abac31e188e | 400 | |
| mbed_official | 525:c320967f86b9 | 401 | |
| mbed_official | 525:c320967f86b9 | 402 | return count; |
| mbed_official | 525:c320967f86b9 | 403 | |
| mbed_official | 525:c320967f86b9 | 404 | } |
| mbed_official | 525:c320967f86b9 | 405 | |
| mbed_official | 525:c320967f86b9 | 406 | int i2c_slave_write(i2c_t *obj, const char *data, int length) |
| mbed_official | 525:c320967f86b9 | 407 | { |
| mbed_official | 525:c320967f86b9 | 408 | int count; |
| mbed_official | 525:c320967f86b9 | 409 | for (count = 0; count < length; count++) { |
| mbed_official | 525:c320967f86b9 | 410 | i2c_byte_write(obj, data[count]); |
| mbed_official | 525:c320967f86b9 | 411 | } |
| mbed_official | 525:c320967f86b9 | 412 | |
| mbed_official | 525:c320967f86b9 | 413 | return count; |
| mbed_official | 525:c320967f86b9 | 414 | } |
| mbed_official | 525:c320967f86b9 | 415 | |
| mbed_official | 525:c320967f86b9 | 416 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) |
| mbed_official | 525:c320967f86b9 | 417 | { |
| mbed_official | 525:c320967f86b9 | 418 | obj->i2c.i2c->SADDR = address; |
| mbed_official | 525:c320967f86b9 | 419 | obj->i2c.i2c->SADDRMASK = 0xFE;//mask; |
| mbed_official | 525:c320967f86b9 | 420 | } |
| mbed_official | 525:c320967f86b9 | 421 | |
| mbed_official | 525:c320967f86b9 | 422 | #endif //DEVICE_I2CSLAVE |
| mbed_official | 525:c320967f86b9 | 423 | |
| mbed_official | 525:c320967f86b9 | 424 | #ifdef DEVICE_I2C_ASYNCH |
| mbed_official | 525:c320967f86b9 | 425 | |
| mbed_official | 525:c320967f86b9 | 426 | #include "em_dma.h" |
| mbed_official | 525:c320967f86b9 | 427 | #include "dma_api_HAL.h" |
| mbed_official | 525:c320967f86b9 | 428 | #include "dma_api.h" |
| mbed_official | 525:c320967f86b9 | 429 | #include "sleep_api.h" |
| mbed_official | 525:c320967f86b9 | 430 | #include "buffer.h" |
| mbed_official | 525:c320967f86b9 | 431 | |
| mbed_official | 525:c320967f86b9 | 432 | /** Start i2c asynchronous transfer. |
| mbed_official | 525:c320967f86b9 | 433 | * @param obj The I2C object |
| mbed_official | 525:c320967f86b9 | 434 | * @param tx The buffer to send |
| mbed_official | 525:c320967f86b9 | 435 | * @param tx_length The number of words to transmit |
| mbed_official | 525:c320967f86b9 | 436 | * @param rx The buffer to receive |
| mbed_official | 525:c320967f86b9 | 437 | * @param rx_length The number of words to receive |
| mbed_official | 525:c320967f86b9 | 438 | * @param address The address to be set - 7bit or 9 bit |
| mbed_official | 525:c320967f86b9 | 439 | * @param stop If true, stop will be generated after the transfer is done |
| mbed_official | 525:c320967f86b9 | 440 | * @param handler The I2C IRQ handler to be set |
| mbed_official | 525:c320967f86b9 | 441 | * @param hint DMA hint usage |
| mbed_official | 525:c320967f86b9 | 442 | */ |
| mbed_official | 564:536c9fb088a0 | 443 | void i2c_transfer_asynch(i2c_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint32_t address, uint32_t stop, uint32_t handler, uint32_t event, DMAUsage hint) |
| mbed_official | 548:1abac31e188e | 444 | { |
| mbed_official | 548:1abac31e188e | 445 | I2C_TransferReturn_TypeDef retval; |
| mbed_official | 548:1abac31e188e | 446 | if(i2c_active(obj)) return; |
| mbed_official | 525:c320967f86b9 | 447 | if((tx_length == 0) && (rx_length == 0)) return; |
| mbed_official | 548:1abac31e188e | 448 | // For now, we are assuming a solely interrupt-driven implementation. |
| mbed_official | 525:c320967f86b9 | 449 | |
| mbed_official | 548:1abac31e188e | 450 | // Store transfer config |
| mbed_official | 548:1abac31e188e | 451 | obj->i2c.xfer.addr = address; |
| mbed_official | 525:c320967f86b9 | 452 | |
| mbed_official | 548:1abac31e188e | 453 | // Some combination of tx_length and rx_length will tell us what to do |
| mbed_official | 548:1abac31e188e | 454 | if((tx_length > 0) && (rx_length == 0)) { |
| mbed_official | 548:1abac31e188e | 455 | obj->i2c.xfer.flags = I2C_FLAG_WRITE; |
| mbed_official | 548:1abac31e188e | 456 | //Store buffer info |
| mbed_official | 564:536c9fb088a0 | 457 | obj->i2c.xfer.buf[0].data = (void *)tx; |
| mbed_official | 548:1abac31e188e | 458 | obj->i2c.xfer.buf[0].len = (uint16_t) tx_length; |
| mbed_official | 548:1abac31e188e | 459 | } else if ((tx_length == 0) && (rx_length > 0)) { |
| mbed_official | 548:1abac31e188e | 460 | obj->i2c.xfer.flags = I2C_FLAG_READ; |
| mbed_official | 548:1abac31e188e | 461 | //Store buffer info |
| mbed_official | 548:1abac31e188e | 462 | obj->i2c.xfer.buf[0].data = rx; |
| mbed_official | 548:1abac31e188e | 463 | obj->i2c.xfer.buf[0].len = (uint16_t) rx_length; |
| mbed_official | 548:1abac31e188e | 464 | } else if ((tx_length > 0) && (rx_length > 0)) { |
| mbed_official | 548:1abac31e188e | 465 | obj->i2c.xfer.flags = I2C_FLAG_WRITE_READ; |
| mbed_official | 548:1abac31e188e | 466 | //Store buffer info |
| mbed_official | 564:536c9fb088a0 | 467 | obj->i2c.xfer.buf[0].data = (void *)tx; |
| mbed_official | 548:1abac31e188e | 468 | obj->i2c.xfer.buf[0].len = (uint16_t) tx_length; |
| mbed_official | 548:1abac31e188e | 469 | obj->i2c.xfer.buf[1].data = rx; |
| mbed_official | 548:1abac31e188e | 470 | obj->i2c.xfer.buf[1].len = (uint16_t) rx_length; |
| mbed_official | 548:1abac31e188e | 471 | } |
| mbed_official | 525:c320967f86b9 | 472 | |
| mbed_official | 548:1abac31e188e | 473 | if(address > 255) obj->i2c.xfer.flags |= I2C_FLAG_10BIT_ADDR; |
| mbed_official | 525:c320967f86b9 | 474 | |
| mbed_official | 548:1abac31e188e | 475 | // Store event flags |
| mbed_official | 548:1abac31e188e | 476 | obj->i2c.events = event; |
| mbed_official | 525:c320967f86b9 | 477 | |
| mbed_official | 548:1abac31e188e | 478 | // Enable interrupt |
| mbed_official | 548:1abac31e188e | 479 | i2c_enable_interrupt(obj, handler, true); |
| mbed_official | 525:c320967f86b9 | 480 | |
| mbed_official | 548:1abac31e188e | 481 | // Kick off the transfer |
| mbed_official | 548:1abac31e188e | 482 | retval = I2C_TransferInit(obj->i2c.i2c, &(obj->i2c.xfer)); |
| mbed_official | 525:c320967f86b9 | 483 | |
| mbed_official | 548:1abac31e188e | 484 | if(retval == i2cTransferInProgress) { |
| mbed_official | 548:1abac31e188e | 485 | blockSleepMode(EM1); |
| mbed_official | 548:1abac31e188e | 486 | } else { |
| mbed_official | 548:1abac31e188e | 487 | // something happened, and the transfer did not go through |
| mbed_official | 548:1abac31e188e | 488 | // So, we need to clean up |
| mbed_official | 525:c320967f86b9 | 489 | |
| mbed_official | 548:1abac31e188e | 490 | // Disable interrupt |
| mbed_official | 548:1abac31e188e | 491 | i2c_enable_interrupt(obj, 0, false); |
| mbed_official | 525:c320967f86b9 | 492 | |
| mbed_official | 548:1abac31e188e | 493 | // Block until free |
| mbed_official | 548:1abac31e188e | 494 | while(i2c_active(obj)); |
| mbed_official | 548:1abac31e188e | 495 | } |
| mbed_official | 525:c320967f86b9 | 496 | } |
| mbed_official | 525:c320967f86b9 | 497 | |
| mbed_official | 525:c320967f86b9 | 498 | /** The asynchronous IRQ handler |
| mbed_official | 525:c320967f86b9 | 499 | * @param obj The I2C object which holds the transfer information |
| mbed_official | 525:c320967f86b9 | 500 | * @return Returns event flags if a transfer termination condition was met or 0 otherwise. |
| mbed_official | 525:c320967f86b9 | 501 | */ |
| mbed_official | 548:1abac31e188e | 502 | uint32_t i2c_irq_handler_asynch(i2c_t *obj) |
| mbed_official | 548:1abac31e188e | 503 | { |
| mbed_official | 525:c320967f86b9 | 504 | |
| mbed_official | 548:1abac31e188e | 505 | // For now, we are assuming a solely interrupt-driven implementation. |
| mbed_official | 525:c320967f86b9 | 506 | |
| mbed_official | 548:1abac31e188e | 507 | I2C_TransferReturn_TypeDef status = I2C_Transfer(obj->i2c.i2c); |
| mbed_official | 548:1abac31e188e | 508 | switch(status) { |
| mbed_official | 548:1abac31e188e | 509 | case i2cTransferInProgress: |
| mbed_official | 548:1abac31e188e | 510 | // Still busy transferring, so let it. |
| mbed_official | 548:1abac31e188e | 511 | return 0; |
| mbed_official | 548:1abac31e188e | 512 | case i2cTransferDone: |
| mbed_official | 548:1abac31e188e | 513 | // Transfer has completed |
| mbed_official | 525:c320967f86b9 | 514 | |
| mbed_official | 548:1abac31e188e | 515 | // Disable interrupt |
| mbed_official | 548:1abac31e188e | 516 | i2c_enable_interrupt(obj, 0, false); |
| mbed_official | 525:c320967f86b9 | 517 | |
| mbed_official | 548:1abac31e188e | 518 | unblockSleepMode(EM1); |
| mbed_official | 525:c320967f86b9 | 519 | |
| mbed_official | 548:1abac31e188e | 520 | return I2C_EVENT_TRANSFER_COMPLETE & obj->i2c.events; |
| mbed_official | 548:1abac31e188e | 521 | case i2cTransferNack: |
| mbed_official | 548:1abac31e188e | 522 | // A NACK has been received while an ACK was expected. This is usually because the slave did not respond to the address. |
| mbed_official | 548:1abac31e188e | 523 | // Disable interrupt |
| mbed_official | 548:1abac31e188e | 524 | i2c_enable_interrupt(obj, 0, false); |
| mbed_official | 525:c320967f86b9 | 525 | |
| mbed_official | 548:1abac31e188e | 526 | unblockSleepMode(EM1); |
| mbed_official | 525:c320967f86b9 | 527 | |
| mbed_official | 548:1abac31e188e | 528 | return I2C_EVENT_ERROR_NO_SLAVE & obj->i2c.events; |
| mbed_official | 548:1abac31e188e | 529 | default: |
| mbed_official | 548:1abac31e188e | 530 | // An error situation has arisen. |
| mbed_official | 548:1abac31e188e | 531 | // Disable interrupt |
| mbed_official | 548:1abac31e188e | 532 | i2c_enable_interrupt(obj, 0, false); |
| mbed_official | 525:c320967f86b9 | 533 | |
| mbed_official | 548:1abac31e188e | 534 | unblockSleepMode(EM1); |
| mbed_official | 525:c320967f86b9 | 535 | |
| mbed_official | 548:1abac31e188e | 536 | // return error |
| mbed_official | 548:1abac31e188e | 537 | return I2C_EVENT_ERROR & obj->i2c.events; |
| mbed_official | 548:1abac31e188e | 538 | } |
| mbed_official | 525:c320967f86b9 | 539 | } |
| mbed_official | 525:c320967f86b9 | 540 | |
| mbed_official | 525:c320967f86b9 | 541 | /** Attempts to determine if I2C peripheral is already in use. |
| mbed_official | 525:c320967f86b9 | 542 | * @param obj The I2C object |
| mbed_official | 525:c320967f86b9 | 543 | * @return non-zero if the I2C module is active or zero if it is not |
| mbed_official | 525:c320967f86b9 | 544 | */ |
| mbed_official | 548:1abac31e188e | 545 | uint8_t i2c_active(i2c_t *obj) |
| mbed_official | 548:1abac31e188e | 546 | { |
| mbed_official | 548:1abac31e188e | 547 | return (obj->i2c.i2c->STATE & I2C_STATE_BUSY); |
| mbed_official | 525:c320967f86b9 | 548 | } |
| mbed_official | 525:c320967f86b9 | 549 | |
| mbed_official | 525:c320967f86b9 | 550 | /** Abort ongoing asynchronous transaction. |
| mbed_official | 525:c320967f86b9 | 551 | * @param obj The I2C object |
| mbed_official | 525:c320967f86b9 | 552 | */ |
| mbed_official | 548:1abac31e188e | 553 | void i2c_abort_asynch(i2c_t *obj) |
| mbed_official | 548:1abac31e188e | 554 | { |
| mbed_official | 548:1abac31e188e | 555 | // Do not deactivate I2C twice |
| mbed_official | 548:1abac31e188e | 556 | if (!i2c_active(obj)) return; |
| mbed_official | 525:c320967f86b9 | 557 | |
| mbed_official | 548:1abac31e188e | 558 | // Disable interrupt |
| mbed_official | 548:1abac31e188e | 559 | i2c_enable_interrupt(obj, 0, false); |
| mbed_official | 525:c320967f86b9 | 560 | |
| mbed_official | 548:1abac31e188e | 561 | // Abort |
| mbed_official | 548:1abac31e188e | 562 | obj->i2c.i2c->CMD = I2C_CMD_STOP | I2C_CMD_ABORT; |
| mbed_official | 525:c320967f86b9 | 563 | |
| mbed_official | 548:1abac31e188e | 564 | // Block until free |
| mbed_official | 548:1abac31e188e | 565 | while(i2c_active(obj)); |
| mbed_official | 525:c320967f86b9 | 566 | |
| mbed_official | 548:1abac31e188e | 567 | unblockSleepMode(EM1); |
| mbed_official | 525:c320967f86b9 | 568 | } |
| mbed_official | 525:c320967f86b9 | 569 | |
| mbed_official | 525:c320967f86b9 | 570 | #endif //DEVICE_I2C ASYNCH |
| mbed_official | 525:c320967f86b9 | 571 | #endif //DEVICE_I2C |