mbed library sources. Supersedes mbed-src.
Fork of mbed-dev by
targets/hal/TARGET_Atmel/TARGET_SAM_CortexM0P/drivers/sercom/i2c/i2c_sam0/i2c_slave.c@144:423e1876dc07, 2016-08-02 (annotated)
- Committer:
- screamer
- Date:
- Tue Aug 02 14:07:36 2016 +0000
- Revision:
- 144:423e1876dc07
- Parent:
- 18:da299f395b9e
Added targets.json file for the supported targets in the release
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 15:a81a8d6c1dfe | 1 | /** |
mbed_official | 15:a81a8d6c1dfe | 2 | * \file |
mbed_official | 15:a81a8d6c1dfe | 3 | * |
mbed_official | 15:a81a8d6c1dfe | 4 | * \brief SAM I2C Slave Driver |
mbed_official | 15:a81a8d6c1dfe | 5 | * |
mbed_official | 15:a81a8d6c1dfe | 6 | * Copyright (C) 2013-2015 Atmel Corporation. All rights reserved. |
mbed_official | 15:a81a8d6c1dfe | 7 | * |
mbed_official | 15:a81a8d6c1dfe | 8 | * \asf_license_start |
mbed_official | 15:a81a8d6c1dfe | 9 | * |
mbed_official | 15:a81a8d6c1dfe | 10 | * \page License |
mbed_official | 15:a81a8d6c1dfe | 11 | * |
mbed_official | 15:a81a8d6c1dfe | 12 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 15:a81a8d6c1dfe | 13 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 15:a81a8d6c1dfe | 14 | * |
mbed_official | 15:a81a8d6c1dfe | 15 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 15:a81a8d6c1dfe | 16 | * this list of conditions and the following disclaimer. |
mbed_official | 15:a81a8d6c1dfe | 17 | * |
mbed_official | 15:a81a8d6c1dfe | 18 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 15:a81a8d6c1dfe | 19 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 15:a81a8d6c1dfe | 20 | * and/or other materials provided with the distribution. |
mbed_official | 15:a81a8d6c1dfe | 21 | * |
mbed_official | 15:a81a8d6c1dfe | 22 | * 3. The name of Atmel may not be used to endorse or promote products derived |
mbed_official | 15:a81a8d6c1dfe | 23 | * from this software without specific prior written permission. |
mbed_official | 15:a81a8d6c1dfe | 24 | * |
mbed_official | 15:a81a8d6c1dfe | 25 | * 4. This software may only be redistributed and used in connection with an |
mbed_official | 15:a81a8d6c1dfe | 26 | * Atmel microcontroller product. |
mbed_official | 15:a81a8d6c1dfe | 27 | * |
mbed_official | 15:a81a8d6c1dfe | 28 | * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED |
mbed_official | 15:a81a8d6c1dfe | 29 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
mbed_official | 15:a81a8d6c1dfe | 30 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE |
mbed_official | 15:a81a8d6c1dfe | 31 | * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR |
mbed_official | 15:a81a8d6c1dfe | 32 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 15:a81a8d6c1dfe | 33 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
mbed_official | 15:a81a8d6c1dfe | 34 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
mbed_official | 15:a81a8d6c1dfe | 35 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
mbed_official | 15:a81a8d6c1dfe | 36 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
mbed_official | 15:a81a8d6c1dfe | 37 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
mbed_official | 15:a81a8d6c1dfe | 38 | * POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 15:a81a8d6c1dfe | 39 | * |
mbed_official | 15:a81a8d6c1dfe | 40 | * \asf_license_stop |
mbed_official | 15:a81a8d6c1dfe | 41 | * |
mbed_official | 15:a81a8d6c1dfe | 42 | */ |
mbed_official | 15:a81a8d6c1dfe | 43 | /* |
mbed_official | 15:a81a8d6c1dfe | 44 | * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a> |
mbed_official | 15:a81a8d6c1dfe | 45 | */ |
mbed_official | 15:a81a8d6c1dfe | 46 | |
mbed_official | 15:a81a8d6c1dfe | 47 | #include "i2c_slave.h" |
mbed_official | 15:a81a8d6c1dfe | 48 | #if I2C_SLAVE_CALLBACK_MODE == true |
mbed_official | 15:a81a8d6c1dfe | 49 | # include "i2c_slave_interrupt.h" |
mbed_official | 15:a81a8d6c1dfe | 50 | #endif |
mbed_official | 15:a81a8d6c1dfe | 51 | |
mbed_official | 15:a81a8d6c1dfe | 52 | /** |
mbed_official | 15:a81a8d6c1dfe | 53 | * \internal Sets configuration to module |
mbed_official | 15:a81a8d6c1dfe | 54 | * |
mbed_official | 15:a81a8d6c1dfe | 55 | * \param[out] module Pointer to software module structure |
mbed_official | 15:a81a8d6c1dfe | 56 | * \param[in] config Configuration structure with configurations to set |
mbed_official | 15:a81a8d6c1dfe | 57 | * |
mbed_official | 15:a81a8d6c1dfe | 58 | * \return Status of setting configuration. |
mbed_official | 15:a81a8d6c1dfe | 59 | * \retval STATUS_OK Module was configured correctly |
mbed_official | 15:a81a8d6c1dfe | 60 | * \retval STATUS_ERR_ALREADY_INITIALIZED If setting other GCLK generator than |
mbed_official | 15:a81a8d6c1dfe | 61 | * previously set |
mbed_official | 15:a81a8d6c1dfe | 62 | */ |
mbed_official | 15:a81a8d6c1dfe | 63 | static enum status_code _i2c_slave_set_config( |
mbed_official | 15:a81a8d6c1dfe | 64 | struct i2c_slave_module *const module, |
mbed_official | 15:a81a8d6c1dfe | 65 | const struct i2c_slave_config *const config) |
mbed_official | 15:a81a8d6c1dfe | 66 | { |
mbed_official | 15:a81a8d6c1dfe | 67 | uint32_t tmp_ctrla; |
mbed_official | 15:a81a8d6c1dfe | 68 | |
mbed_official | 15:a81a8d6c1dfe | 69 | /* Sanity check arguments. */ |
mbed_official | 15:a81a8d6c1dfe | 70 | Assert(module); |
mbed_official | 15:a81a8d6c1dfe | 71 | Assert(module->hw); |
mbed_official | 15:a81a8d6c1dfe | 72 | Assert(config); |
mbed_official | 15:a81a8d6c1dfe | 73 | |
mbed_official | 15:a81a8d6c1dfe | 74 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
mbed_official | 15:a81a8d6c1dfe | 75 | Sercom *const sercom_hw = module->hw; |
mbed_official | 15:a81a8d6c1dfe | 76 | |
mbed_official | 15:a81a8d6c1dfe | 77 | module->buffer_timeout = config->buffer_timeout; |
mbed_official | 15:a81a8d6c1dfe | 78 | module->ten_bit_address = config->ten_bit_address; |
mbed_official | 15:a81a8d6c1dfe | 79 | |
mbed_official | 15:a81a8d6c1dfe | 80 | struct system_pinmux_config pin_conf; |
mbed_official | 15:a81a8d6c1dfe | 81 | system_pinmux_get_config_defaults(&pin_conf); |
mbed_official | 15:a81a8d6c1dfe | 82 | |
mbed_official | 15:a81a8d6c1dfe | 83 | uint32_t pad0 = config->pinmux_pad0; |
mbed_official | 15:a81a8d6c1dfe | 84 | uint32_t pad1 = config->pinmux_pad1; |
mbed_official | 15:a81a8d6c1dfe | 85 | |
mbed_official | 15:a81a8d6c1dfe | 86 | /* SERCOM PAD0 - SDA */ |
mbed_official | 15:a81a8d6c1dfe | 87 | if (pad0 == PINMUX_DEFAULT) { |
mbed_official | 15:a81a8d6c1dfe | 88 | pad0 = _sercom_get_default_pad(sercom_hw, 0); |
mbed_official | 15:a81a8d6c1dfe | 89 | } |
mbed_official | 15:a81a8d6c1dfe | 90 | pin_conf.mux_position = pad0 & 0xFFFF; |
mbed_official | 15:a81a8d6c1dfe | 91 | pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_OUTPUT_WITH_READBACK; |
mbed_official | 15:a81a8d6c1dfe | 92 | system_pinmux_pin_set_config(pad0 >> 16, &pin_conf); |
mbed_official | 15:a81a8d6c1dfe | 93 | |
mbed_official | 15:a81a8d6c1dfe | 94 | /* SERCOM PAD1 - SCL */ |
mbed_official | 15:a81a8d6c1dfe | 95 | if (pad1 == PINMUX_DEFAULT) { |
mbed_official | 15:a81a8d6c1dfe | 96 | pad1 = _sercom_get_default_pad(sercom_hw, 1); |
mbed_official | 15:a81a8d6c1dfe | 97 | } |
mbed_official | 15:a81a8d6c1dfe | 98 | pin_conf.mux_position = pad1 & 0xFFFF; |
mbed_official | 15:a81a8d6c1dfe | 99 | pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_OUTPUT_WITH_READBACK; |
mbed_official | 15:a81a8d6c1dfe | 100 | system_pinmux_pin_set_config(pad1 >> 16, &pin_conf); |
mbed_official | 15:a81a8d6c1dfe | 101 | |
mbed_official | 15:a81a8d6c1dfe | 102 | /* Prepare config to write to register CTRLA */ |
mbed_official | 15:a81a8d6c1dfe | 103 | if (config->run_in_standby || system_is_debugger_present()) { |
mbed_official | 15:a81a8d6c1dfe | 104 | tmp_ctrla = SERCOM_I2CS_CTRLA_RUNSTDBY; |
mbed_official | 15:a81a8d6c1dfe | 105 | } else { |
mbed_official | 15:a81a8d6c1dfe | 106 | tmp_ctrla = 0; |
mbed_official | 15:a81a8d6c1dfe | 107 | } |
mbed_official | 15:a81a8d6c1dfe | 108 | |
mbed_official | 15:a81a8d6c1dfe | 109 | tmp_ctrla |= ((uint32_t)config->sda_hold_time | |
mbed_official | 15:a81a8d6c1dfe | 110 | config->transfer_speed | |
mbed_official | 15:a81a8d6c1dfe | 111 | (config->scl_low_timeout << SERCOM_I2CS_CTRLA_LOWTOUTEN_Pos) | |
mbed_official | 15:a81a8d6c1dfe | 112 | (config->scl_stretch_only_after_ack_bit << SERCOM_I2CS_CTRLA_SCLSM_Pos) | |
mbed_official | 15:a81a8d6c1dfe | 113 | (config->slave_scl_low_extend_timeout << SERCOM_I2CS_CTRLA_SEXTTOEN_Pos)); |
mbed_official | 15:a81a8d6c1dfe | 114 | |
mbed_official | 15:a81a8d6c1dfe | 115 | i2c_hw->CTRLA.reg |= tmp_ctrla; |
mbed_official | 15:a81a8d6c1dfe | 116 | |
mbed_official | 15:a81a8d6c1dfe | 117 | /* Set CTRLB configuration */ |
mbed_official | 15:a81a8d6c1dfe | 118 | i2c_hw->CTRLB.reg = SERCOM_I2CS_CTRLB_SMEN | config->address_mode; |
mbed_official | 15:a81a8d6c1dfe | 119 | |
mbed_official | 15:a81a8d6c1dfe | 120 | i2c_hw->ADDR.reg = config->address << SERCOM_I2CS_ADDR_ADDR_Pos | |
mbed_official | 15:a81a8d6c1dfe | 121 | config->address_mask << SERCOM_I2CS_ADDR_ADDRMASK_Pos | |
mbed_official | 15:a81a8d6c1dfe | 122 | config->ten_bit_address << SERCOM_I2CS_ADDR_TENBITEN_Pos | |
mbed_official | 15:a81a8d6c1dfe | 123 | config->enable_general_call_address << SERCOM_I2CS_ADDR_GENCEN_Pos; |
mbed_official | 15:a81a8d6c1dfe | 124 | |
mbed_official | 15:a81a8d6c1dfe | 125 | return STATUS_OK; |
mbed_official | 15:a81a8d6c1dfe | 126 | } |
mbed_official | 15:a81a8d6c1dfe | 127 | |
mbed_official | 15:a81a8d6c1dfe | 128 | /** |
mbed_official | 15:a81a8d6c1dfe | 129 | * \brief Initializes the requested I<SUP>2</SUP>C hardware module |
mbed_official | 15:a81a8d6c1dfe | 130 | * |
mbed_official | 15:a81a8d6c1dfe | 131 | * Initializes the SERCOM I<SUP>2</SUP>C Slave device requested and sets the provided |
mbed_official | 15:a81a8d6c1dfe | 132 | * software module struct. Run this function before any further use of |
mbed_official | 15:a81a8d6c1dfe | 133 | * the driver. |
mbed_official | 15:a81a8d6c1dfe | 134 | * |
mbed_official | 15:a81a8d6c1dfe | 135 | * \param[out] module Pointer to software module struct |
mbed_official | 15:a81a8d6c1dfe | 136 | * \param[in] hw Pointer to the hardware instance |
mbed_official | 15:a81a8d6c1dfe | 137 | * \param[in] config Pointer to the configuration struct |
mbed_official | 15:a81a8d6c1dfe | 138 | * |
mbed_official | 15:a81a8d6c1dfe | 139 | * \return Status of initialization. |
mbed_official | 15:a81a8d6c1dfe | 140 | * \retval STATUS_OK Module initiated correctly |
mbed_official | 15:a81a8d6c1dfe | 141 | * \retval STATUS_ERR_DENIED If module is enabled |
mbed_official | 15:a81a8d6c1dfe | 142 | * \retval STATUS_BUSY If module is busy resetting |
mbed_official | 15:a81a8d6c1dfe | 143 | * \retval STATUS_ERR_ALREADY_INITIALIZED If setting other GCLK generator than |
mbed_official | 15:a81a8d6c1dfe | 144 | * previously set |
mbed_official | 15:a81a8d6c1dfe | 145 | */ |
mbed_official | 15:a81a8d6c1dfe | 146 | enum status_code i2c_slave_init( |
mbed_official | 15:a81a8d6c1dfe | 147 | struct i2c_slave_module *const module, |
mbed_official | 15:a81a8d6c1dfe | 148 | Sercom *const hw, |
mbed_official | 15:a81a8d6c1dfe | 149 | const struct i2c_slave_config *const config) |
mbed_official | 15:a81a8d6c1dfe | 150 | { |
mbed_official | 15:a81a8d6c1dfe | 151 | /* Sanity check arguments. */ |
mbed_official | 15:a81a8d6c1dfe | 152 | Assert(module); |
mbed_official | 15:a81a8d6c1dfe | 153 | Assert(hw); |
mbed_official | 15:a81a8d6c1dfe | 154 | Assert(config); |
mbed_official | 15:a81a8d6c1dfe | 155 | |
mbed_official | 15:a81a8d6c1dfe | 156 | /* Initialize software module */ |
mbed_official | 15:a81a8d6c1dfe | 157 | module->hw = hw; |
mbed_official | 15:a81a8d6c1dfe | 158 | |
mbed_official | 15:a81a8d6c1dfe | 159 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
mbed_official | 15:a81a8d6c1dfe | 160 | |
mbed_official | 15:a81a8d6c1dfe | 161 | /* Check if module is enabled. */ |
mbed_official | 15:a81a8d6c1dfe | 162 | if (i2c_hw->CTRLA.reg & SERCOM_I2CS_CTRLA_ENABLE) { |
mbed_official | 15:a81a8d6c1dfe | 163 | return STATUS_ERR_DENIED; |
mbed_official | 15:a81a8d6c1dfe | 164 | } |
mbed_official | 15:a81a8d6c1dfe | 165 | |
mbed_official | 15:a81a8d6c1dfe | 166 | /* Check if reset is in progress. */ |
mbed_official | 15:a81a8d6c1dfe | 167 | if (i2c_hw->CTRLA.reg & SERCOM_I2CS_CTRLA_SWRST) { |
mbed_official | 15:a81a8d6c1dfe | 168 | return STATUS_BUSY; |
mbed_official | 15:a81a8d6c1dfe | 169 | } |
mbed_official | 15:a81a8d6c1dfe | 170 | |
mbed_official | 15:a81a8d6c1dfe | 171 | uint32_t sercom_index = _sercom_get_sercom_inst_index(module->hw); |
mbed_official | 15:a81a8d6c1dfe | 172 | uint32_t pm_index, gclk_index; |
mbed_official | 15:a81a8d6c1dfe | 173 | #if (SAML21) || (SAMC20) || (SAMC21) |
mbed_official | 15:a81a8d6c1dfe | 174 | #if (SAML21) |
mbed_official | 15:a81a8d6c1dfe | 175 | if (sercom_index == 5) { |
mbed_official | 15:a81a8d6c1dfe | 176 | pm_index = MCLK_APBDMASK_SERCOM5_Pos; |
mbed_official | 15:a81a8d6c1dfe | 177 | gclk_index = SERCOM5_GCLK_ID_CORE; |
mbed_official | 15:a81a8d6c1dfe | 178 | } else { |
mbed_official | 15:a81a8d6c1dfe | 179 | pm_index = sercom_index + MCLK_APBCMASK_SERCOM0_Pos; |
mbed_official | 15:a81a8d6c1dfe | 180 | gclk_index = sercom_index + SERCOM0_GCLK_ID_CORE; |
mbed_official | 15:a81a8d6c1dfe | 181 | } |
mbed_official | 15:a81a8d6c1dfe | 182 | #else |
mbed_official | 15:a81a8d6c1dfe | 183 | pm_index = sercom_index + MCLK_APBCMASK_SERCOM0_Pos; |
mbed_official | 15:a81a8d6c1dfe | 184 | gclk_index = sercom_index + SERCOM0_GCLK_ID_CORE; |
mbed_official | 15:a81a8d6c1dfe | 185 | #endif |
mbed_official | 15:a81a8d6c1dfe | 186 | #else |
mbed_official | 15:a81a8d6c1dfe | 187 | pm_index = sercom_index + PM_APBCMASK_SERCOM0_Pos; |
mbed_official | 15:a81a8d6c1dfe | 188 | gclk_index = sercom_index + SERCOM0_GCLK_ID_CORE; |
mbed_official | 15:a81a8d6c1dfe | 189 | #endif |
mbed_official | 15:a81a8d6c1dfe | 190 | |
mbed_official | 15:a81a8d6c1dfe | 191 | /* Turn on module in PM */ |
mbed_official | 15:a81a8d6c1dfe | 192 | #if (SAML21) |
mbed_official | 15:a81a8d6c1dfe | 193 | if (sercom_index == 5) { |
mbed_official | 15:a81a8d6c1dfe | 194 | system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBD, 1 << pm_index); |
mbed_official | 15:a81a8d6c1dfe | 195 | } else { |
mbed_official | 15:a81a8d6c1dfe | 196 | system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBC, 1 << pm_index); |
mbed_official | 15:a81a8d6c1dfe | 197 | } |
mbed_official | 15:a81a8d6c1dfe | 198 | #else |
mbed_official | 15:a81a8d6c1dfe | 199 | system_apb_clock_set_mask(SYSTEM_CLOCK_APB_APBC, 1 << pm_index); |
mbed_official | 15:a81a8d6c1dfe | 200 | #endif |
mbed_official | 15:a81a8d6c1dfe | 201 | |
mbed_official | 15:a81a8d6c1dfe | 202 | /* Set up the GCLK for the module */ |
mbed_official | 15:a81a8d6c1dfe | 203 | struct system_gclk_chan_config gclk_chan_conf; |
mbed_official | 15:a81a8d6c1dfe | 204 | system_gclk_chan_get_config_defaults(&gclk_chan_conf); |
mbed_official | 15:a81a8d6c1dfe | 205 | gclk_chan_conf.source_generator = config->generator_source; |
mbed_official | 15:a81a8d6c1dfe | 206 | system_gclk_chan_set_config(gclk_index, &gclk_chan_conf); |
mbed_official | 15:a81a8d6c1dfe | 207 | system_gclk_chan_enable(gclk_index); |
mbed_official | 15:a81a8d6c1dfe | 208 | sercom_set_gclk_generator(config->generator_source, false); |
mbed_official | 15:a81a8d6c1dfe | 209 | |
mbed_official | 15:a81a8d6c1dfe | 210 | #if I2C_SLAVE_CALLBACK_MODE == true |
mbed_official | 15:a81a8d6c1dfe | 211 | /* Get sercom instance index. */ |
mbed_official | 15:a81a8d6c1dfe | 212 | uint8_t instance_index = _sercom_get_sercom_inst_index(module->hw); |
mbed_official | 15:a81a8d6c1dfe | 213 | |
mbed_official | 15:a81a8d6c1dfe | 214 | /* Save software module in interrupt handler. */ |
mbed_official | 15:a81a8d6c1dfe | 215 | _sercom_set_handler(instance_index, _i2c_slave_interrupt_handler); |
mbed_official | 15:a81a8d6c1dfe | 216 | |
mbed_official | 15:a81a8d6c1dfe | 217 | /* Save software module. */ |
mbed_official | 15:a81a8d6c1dfe | 218 | _sercom_instances[instance_index] = module; |
mbed_official | 15:a81a8d6c1dfe | 219 | |
mbed_official | 15:a81a8d6c1dfe | 220 | /* Initialize values in module. */ |
mbed_official | 15:a81a8d6c1dfe | 221 | module->registered_callback = 0; |
mbed_official | 15:a81a8d6c1dfe | 222 | module->enabled_callback = 0; |
mbed_official | 15:a81a8d6c1dfe | 223 | module->buffer_length = 0; |
mbed_official | 15:a81a8d6c1dfe | 224 | module->nack_on_address = config->enable_nack_on_address; |
mbed_official | 15:a81a8d6c1dfe | 225 | #endif |
mbed_official | 15:a81a8d6c1dfe | 226 | |
mbed_official | 15:a81a8d6c1dfe | 227 | /* Set SERCOM module to operate in I2C slave mode. */ |
mbed_official | 15:a81a8d6c1dfe | 228 | i2c_hw->CTRLA.reg = SERCOM_I2CS_CTRLA_MODE(0x4); |
mbed_official | 15:a81a8d6c1dfe | 229 | |
mbed_official | 15:a81a8d6c1dfe | 230 | /* Set config and return status. */ |
mbed_official | 15:a81a8d6c1dfe | 231 | return _i2c_slave_set_config(module, config); |
mbed_official | 15:a81a8d6c1dfe | 232 | } |
mbed_official | 15:a81a8d6c1dfe | 233 | |
mbed_official | 15:a81a8d6c1dfe | 234 | /** |
mbed_official | 15:a81a8d6c1dfe | 235 | * \brief Resets the hardware module |
mbed_official | 15:a81a8d6c1dfe | 236 | * |
mbed_official | 15:a81a8d6c1dfe | 237 | * This will reset the module to hardware defaults. |
mbed_official | 15:a81a8d6c1dfe | 238 | * |
mbed_official | 15:a81a8d6c1dfe | 239 | * \param[in,out] module Pointer to software module structure |
mbed_official | 15:a81a8d6c1dfe | 240 | */ |
mbed_official | 15:a81a8d6c1dfe | 241 | void i2c_slave_reset( |
mbed_official | 15:a81a8d6c1dfe | 242 | struct i2c_slave_module *const module) |
mbed_official | 15:a81a8d6c1dfe | 243 | { |
mbed_official | 15:a81a8d6c1dfe | 244 | /* Sanity check arguments. */ |
mbed_official | 15:a81a8d6c1dfe | 245 | Assert(module); |
mbed_official | 15:a81a8d6c1dfe | 246 | Assert(module->hw); |
mbed_official | 15:a81a8d6c1dfe | 247 | |
mbed_official | 15:a81a8d6c1dfe | 248 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
mbed_official | 15:a81a8d6c1dfe | 249 | |
mbed_official | 15:a81a8d6c1dfe | 250 | #if I2C_SLAVE_CALLBACK_MODE == true |
mbed_official | 15:a81a8d6c1dfe | 251 | /* Reset module instance. */ |
mbed_official | 15:a81a8d6c1dfe | 252 | module->registered_callback = 0; |
mbed_official | 15:a81a8d6c1dfe | 253 | module->enabled_callback = 0; |
mbed_official | 15:a81a8d6c1dfe | 254 | module->buffer_length = 0; |
mbed_official | 15:a81a8d6c1dfe | 255 | module->buffer_remaining = 0; |
mbed_official | 15:a81a8d6c1dfe | 256 | module->buffer = NULL; |
mbed_official | 15:a81a8d6c1dfe | 257 | #endif |
mbed_official | 15:a81a8d6c1dfe | 258 | |
mbed_official | 15:a81a8d6c1dfe | 259 | /* Disable module */ |
mbed_official | 15:a81a8d6c1dfe | 260 | i2c_slave_disable(module); |
mbed_official | 15:a81a8d6c1dfe | 261 | |
mbed_official | 15:a81a8d6c1dfe | 262 | #if I2C_SLAVE_CALLBACK_MODE == true |
mbed_official | 15:a81a8d6c1dfe | 263 | /* Clear all pending interrupts. */ |
mbed_official | 15:a81a8d6c1dfe | 264 | system_interrupt_enter_critical_section(); |
mbed_official | 15:a81a8d6c1dfe | 265 | system_interrupt_clear_pending(_sercom_get_interrupt_vector(module->hw)); |
mbed_official | 15:a81a8d6c1dfe | 266 | system_interrupt_leave_critical_section(); |
mbed_official | 15:a81a8d6c1dfe | 267 | #endif |
mbed_official | 15:a81a8d6c1dfe | 268 | |
mbed_official | 15:a81a8d6c1dfe | 269 | /* Wait for sync. */ |
mbed_official | 15:a81a8d6c1dfe | 270 | _i2c_slave_wait_for_sync(module); |
mbed_official | 15:a81a8d6c1dfe | 271 | |
mbed_official | 15:a81a8d6c1dfe | 272 | /* Reset module. */ |
mbed_official | 15:a81a8d6c1dfe | 273 | i2c_hw->CTRLA.reg = SERCOM_I2CS_CTRLA_SWRST; |
mbed_official | 15:a81a8d6c1dfe | 274 | } |
mbed_official | 15:a81a8d6c1dfe | 275 | |
mbed_official | 15:a81a8d6c1dfe | 276 | /** |
mbed_official | 15:a81a8d6c1dfe | 277 | * \internal Waits for answer on bus |
mbed_official | 15:a81a8d6c1dfe | 278 | * |
mbed_official | 15:a81a8d6c1dfe | 279 | * \param[in] module Pointer to software module structure |
mbed_official | 15:a81a8d6c1dfe | 280 | * |
mbed_official | 15:a81a8d6c1dfe | 281 | * \return Status of bus. |
mbed_official | 15:a81a8d6c1dfe | 282 | * \retval STATUS_OK If given response from slave device |
mbed_official | 15:a81a8d6c1dfe | 283 | * \retval STATUS_ERR_TIMEOUT If no response was given within specified timeout |
mbed_official | 15:a81a8d6c1dfe | 284 | * period |
mbed_official | 15:a81a8d6c1dfe | 285 | */ |
mbed_official | 15:a81a8d6c1dfe | 286 | static enum status_code _i2c_slave_wait_for_bus( |
mbed_official | 15:a81a8d6c1dfe | 287 | struct i2c_slave_module *const module) |
mbed_official | 15:a81a8d6c1dfe | 288 | { |
mbed_official | 15:a81a8d6c1dfe | 289 | /* Sanity check arguments. */ |
mbed_official | 15:a81a8d6c1dfe | 290 | Assert(module); |
mbed_official | 15:a81a8d6c1dfe | 291 | Assert(module->hw); |
mbed_official | 15:a81a8d6c1dfe | 292 | |
mbed_official | 15:a81a8d6c1dfe | 293 | SercomI2cm *const i2c_module = &(module->hw->I2CM); |
mbed_official | 15:a81a8d6c1dfe | 294 | |
mbed_official | 15:a81a8d6c1dfe | 295 | /* Wait for reply. */ |
mbed_official | 15:a81a8d6c1dfe | 296 | uint16_t timeout_counter = 0; |
mbed_official | 15:a81a8d6c1dfe | 297 | while ((!(i2c_module->INTFLAG.reg & SERCOM_I2CS_INTFLAG_DRDY)) && |
mbed_official | 15:a81a8d6c1dfe | 298 | (!(i2c_module->INTFLAG.reg & SERCOM_I2CS_INTFLAG_PREC)) && |
mbed_official | 15:a81a8d6c1dfe | 299 | (!(i2c_module->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH))) { |
mbed_official | 15:a81a8d6c1dfe | 300 | |
mbed_official | 15:a81a8d6c1dfe | 301 | /* Check timeout condition. */ |
mbed_official | 15:a81a8d6c1dfe | 302 | if (++timeout_counter >= module->buffer_timeout) { |
mbed_official | 15:a81a8d6c1dfe | 303 | return STATUS_ERR_TIMEOUT; |
mbed_official | 15:a81a8d6c1dfe | 304 | } |
mbed_official | 15:a81a8d6c1dfe | 305 | } |
mbed_official | 15:a81a8d6c1dfe | 306 | return STATUS_OK; |
mbed_official | 15:a81a8d6c1dfe | 307 | } |
mbed_official | 15:a81a8d6c1dfe | 308 | |
mbed_official | 15:a81a8d6c1dfe | 309 | /** |
mbed_official | 15:a81a8d6c1dfe | 310 | * \brief Writes a packet to the master |
mbed_official | 15:a81a8d6c1dfe | 311 | * |
mbed_official | 15:a81a8d6c1dfe | 312 | * Writes a packet to the master. This will wait for the master to issue |
mbed_official | 15:a81a8d6c1dfe | 313 | * a request. |
mbed_official | 15:a81a8d6c1dfe | 314 | * |
mbed_official | 15:a81a8d6c1dfe | 315 | * \param[in] module Pointer to software module structure |
mbed_official | 15:a81a8d6c1dfe | 316 | * \param[in] packet Packet to write to master |
mbed_official | 15:a81a8d6c1dfe | 317 | * |
mbed_official | 15:a81a8d6c1dfe | 318 | * \return Status of packet write. |
mbed_official | 15:a81a8d6c1dfe | 319 | * \retval STATUS_OK Packet was written successfully |
mbed_official | 15:a81a8d6c1dfe | 320 | * \retval STATUS_ERR_DENIED Start condition not received, another |
mbed_official | 15:a81a8d6c1dfe | 321 | * interrupt flag is set |
mbed_official | 15:a81a8d6c1dfe | 322 | * \retval STATUS_ERR_IO There was an error in the previous transfer |
mbed_official | 15:a81a8d6c1dfe | 323 | * \retval STATUS_ERR_BAD_FORMAT Master wants to write data |
mbed_official | 15:a81a8d6c1dfe | 324 | * \retval STATUS_ERR_INVALID_ARG Invalid argument(s) was provided |
mbed_official | 15:a81a8d6c1dfe | 325 | * \retval STATUS_ERR_BUSY The I<SUP>2</SUP>C module is busy with a job |
mbed_official | 15:a81a8d6c1dfe | 326 | * \retval STATUS_ERR_ERR_OVERFLOW Master NACKed before entire packet was |
mbed_official | 15:a81a8d6c1dfe | 327 | * transferred |
mbed_official | 15:a81a8d6c1dfe | 328 | * \retval STATUS_ERR_TIMEOUT No response was given within the timeout |
mbed_official | 15:a81a8d6c1dfe | 329 | * period |
mbed_official | 15:a81a8d6c1dfe | 330 | */ |
mbed_official | 15:a81a8d6c1dfe | 331 | enum status_code i2c_slave_write_packet_wait( |
mbed_official | 15:a81a8d6c1dfe | 332 | struct i2c_slave_module *const module, |
mbed_official | 15:a81a8d6c1dfe | 333 | struct i2c_slave_packet *const packet) |
mbed_official | 15:a81a8d6c1dfe | 334 | { |
mbed_official | 15:a81a8d6c1dfe | 335 | /* Sanity check arguments. */ |
mbed_official | 15:a81a8d6c1dfe | 336 | Assert(module); |
mbed_official | 15:a81a8d6c1dfe | 337 | Assert(module->hw); |
mbed_official | 15:a81a8d6c1dfe | 338 | Assert(packet); |
mbed_official | 15:a81a8d6c1dfe | 339 | |
mbed_official | 15:a81a8d6c1dfe | 340 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
mbed_official | 15:a81a8d6c1dfe | 341 | |
mbed_official | 15:a81a8d6c1dfe | 342 | uint16_t length = packet->data_length; |
mbed_official | 15:a81a8d6c1dfe | 343 | |
mbed_official | 15:a81a8d6c1dfe | 344 | if (length == 0) { |
mbed_official | 15:a81a8d6c1dfe | 345 | return STATUS_ERR_INVALID_ARG; |
mbed_official | 15:a81a8d6c1dfe | 346 | } |
mbed_official | 15:a81a8d6c1dfe | 347 | |
mbed_official | 15:a81a8d6c1dfe | 348 | #if I2C_SLAVE_CALLBACK_MODE == true |
mbed_official | 15:a81a8d6c1dfe | 349 | /* Check if the module is busy with a job or AMATCH is enabled */ |
mbed_official | 15:a81a8d6c1dfe | 350 | if (module->buffer_remaining > 0 || |
mbed_official | 15:a81a8d6c1dfe | 351 | (i2c_hw->INTENSET.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
mbed_official | 15:a81a8d6c1dfe | 352 | return STATUS_BUSY; |
mbed_official | 15:a81a8d6c1dfe | 353 | } |
mbed_official | 15:a81a8d6c1dfe | 354 | #endif |
mbed_official | 15:a81a8d6c1dfe | 355 | |
mbed_official | 15:a81a8d6c1dfe | 356 | enum status_code status; |
mbed_official | 15:a81a8d6c1dfe | 357 | /* Wait for master to send address packet */ |
mbed_official | 15:a81a8d6c1dfe | 358 | status = _i2c_slave_wait_for_bus(module); |
mbed_official | 15:a81a8d6c1dfe | 359 | |
mbed_official | 15:a81a8d6c1dfe | 360 | if (status != STATUS_OK) { |
mbed_official | 15:a81a8d6c1dfe | 361 | /* Timeout, return */ |
mbed_official | 15:a81a8d6c1dfe | 362 | return status; |
mbed_official | 15:a81a8d6c1dfe | 363 | } |
mbed_official | 15:a81a8d6c1dfe | 364 | if (!(i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
mbed_official | 15:a81a8d6c1dfe | 365 | /* Not address interrupt, something is wrong */ |
mbed_official | 15:a81a8d6c1dfe | 366 | return STATUS_ERR_DENIED; |
mbed_official | 15:a81a8d6c1dfe | 367 | } |
mbed_official | 15:a81a8d6c1dfe | 368 | |
mbed_official | 15:a81a8d6c1dfe | 369 | if (module->ten_bit_address) { |
mbed_official | 15:a81a8d6c1dfe | 370 | /* ACK the first address */ |
mbed_official | 15:a81a8d6c1dfe | 371 | i2c_hw->CTRLB.reg &= ~SERCOM_I2CS_CTRLB_ACKACT; |
mbed_official | 15:a81a8d6c1dfe | 372 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x3); |
mbed_official | 15:a81a8d6c1dfe | 373 | |
mbed_official | 15:a81a8d6c1dfe | 374 | /* Wait for address interrupt */ |
mbed_official | 15:a81a8d6c1dfe | 375 | status = _i2c_slave_wait_for_bus(module); |
mbed_official | 15:a81a8d6c1dfe | 376 | |
mbed_official | 15:a81a8d6c1dfe | 377 | if (status != STATUS_OK) { |
mbed_official | 15:a81a8d6c1dfe | 378 | /* Timeout, return */ |
mbed_official | 15:a81a8d6c1dfe | 379 | return STATUS_ERR_TIMEOUT; |
mbed_official | 15:a81a8d6c1dfe | 380 | } |
mbed_official | 15:a81a8d6c1dfe | 381 | |
mbed_official | 15:a81a8d6c1dfe | 382 | if (!(i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
mbed_official | 15:a81a8d6c1dfe | 383 | /* Not address interrupt, something is wrong */ |
mbed_official | 15:a81a8d6c1dfe | 384 | return STATUS_ERR_DENIED; |
mbed_official | 15:a81a8d6c1dfe | 385 | } |
mbed_official | 15:a81a8d6c1dfe | 386 | } |
mbed_official | 15:a81a8d6c1dfe | 387 | |
mbed_official | 15:a81a8d6c1dfe | 388 | /* Check if there was an error in last transfer */ |
mbed_official | 15:a81a8d6c1dfe | 389 | if (i2c_hw->STATUS.reg & (SERCOM_I2CS_STATUS_BUSERR | |
mbed_official | 15:a81a8d6c1dfe | 390 | SERCOM_I2CS_STATUS_COLL | SERCOM_I2CS_STATUS_LOWTOUT)) { |
mbed_official | 15:a81a8d6c1dfe | 391 | return STATUS_ERR_IO; |
mbed_official | 15:a81a8d6c1dfe | 392 | } |
mbed_official | 15:a81a8d6c1dfe | 393 | |
mbed_official | 15:a81a8d6c1dfe | 394 | /* Check direction */ |
mbed_official | 15:a81a8d6c1dfe | 395 | if (!(i2c_hw->STATUS.reg & SERCOM_I2CS_STATUS_DIR)) { |
mbed_official | 15:a81a8d6c1dfe | 396 | /* Write request from master, send NACK and return */ |
mbed_official | 15:a81a8d6c1dfe | 397 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_ACKACT; |
mbed_official | 15:a81a8d6c1dfe | 398 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x3); |
mbed_official | 15:a81a8d6c1dfe | 399 | return STATUS_ERR_BAD_FORMAT; |
mbed_official | 15:a81a8d6c1dfe | 400 | } |
mbed_official | 15:a81a8d6c1dfe | 401 | |
mbed_official | 15:a81a8d6c1dfe | 402 | /* Read request from master, ACK address */ |
mbed_official | 15:a81a8d6c1dfe | 403 | i2c_hw->CTRLB.reg &= ~SERCOM_I2CS_CTRLB_ACKACT; |
mbed_official | 15:a81a8d6c1dfe | 404 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x3); |
mbed_official | 15:a81a8d6c1dfe | 405 | |
mbed_official | 15:a81a8d6c1dfe | 406 | uint16_t i = 0; |
mbed_official | 15:a81a8d6c1dfe | 407 | |
mbed_official | 15:a81a8d6c1dfe | 408 | /* Wait for data interrupt */ |
mbed_official | 15:a81a8d6c1dfe | 409 | status = _i2c_slave_wait_for_bus(module); |
mbed_official | 15:a81a8d6c1dfe | 410 | if (status != STATUS_OK) { |
mbed_official | 15:a81a8d6c1dfe | 411 | /* Timeout, return */ |
mbed_official | 15:a81a8d6c1dfe | 412 | return status; |
mbed_official | 15:a81a8d6c1dfe | 413 | } |
mbed_official | 15:a81a8d6c1dfe | 414 | |
mbed_official | 15:a81a8d6c1dfe | 415 | while (length--) { |
mbed_official | 15:a81a8d6c1dfe | 416 | /* Write data */ |
mbed_official | 15:a81a8d6c1dfe | 417 | _i2c_slave_wait_for_sync(module); |
mbed_official | 15:a81a8d6c1dfe | 418 | i2c_hw->DATA.reg = packet->data[i++]; |
mbed_official | 15:a81a8d6c1dfe | 419 | |
mbed_official | 15:a81a8d6c1dfe | 420 | /* Wait for response from master */ |
mbed_official | 15:a81a8d6c1dfe | 421 | status = _i2c_slave_wait_for_bus(module); |
mbed_official | 15:a81a8d6c1dfe | 422 | |
mbed_official | 15:a81a8d6c1dfe | 423 | if (status != STATUS_OK) { |
mbed_official | 15:a81a8d6c1dfe | 424 | /* Timeout, return */ |
mbed_official | 15:a81a8d6c1dfe | 425 | return status; |
mbed_official | 15:a81a8d6c1dfe | 426 | } |
mbed_official | 15:a81a8d6c1dfe | 427 | |
mbed_official | 15:a81a8d6c1dfe | 428 | if (i2c_hw->STATUS.reg & SERCOM_I2CS_STATUS_RXNACK && |
mbed_official | 15:a81a8d6c1dfe | 429 | length !=0) { |
mbed_official | 15:a81a8d6c1dfe | 430 | /* NACK from master, abort */ |
mbed_official | 15:a81a8d6c1dfe | 431 | /* Release line */ |
mbed_official | 15:a81a8d6c1dfe | 432 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x02); |
mbed_official | 15:a81a8d6c1dfe | 433 | |
mbed_official | 15:a81a8d6c1dfe | 434 | return STATUS_ERR_OVERFLOW; |
mbed_official | 15:a81a8d6c1dfe | 435 | } |
mbed_official | 15:a81a8d6c1dfe | 436 | /* ACK from master, continue writing */ |
mbed_official | 15:a81a8d6c1dfe | 437 | } |
mbed_official | 15:a81a8d6c1dfe | 438 | |
mbed_official | 15:a81a8d6c1dfe | 439 | /* Release line */ |
mbed_official | 15:a81a8d6c1dfe | 440 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x02); |
mbed_official | 15:a81a8d6c1dfe | 441 | |
mbed_official | 15:a81a8d6c1dfe | 442 | return STATUS_OK; |
mbed_official | 15:a81a8d6c1dfe | 443 | } |
mbed_official | 15:a81a8d6c1dfe | 444 | |
mbed_official | 15:a81a8d6c1dfe | 445 | /** |
mbed_official | 15:a81a8d6c1dfe | 446 | * \brief Reads a packet from the master |
mbed_official | 15:a81a8d6c1dfe | 447 | * |
mbed_official | 15:a81a8d6c1dfe | 448 | * Reads a packet from the master. This will wait for the master to issue a |
mbed_official | 15:a81a8d6c1dfe | 449 | * request. |
mbed_official | 15:a81a8d6c1dfe | 450 | * |
mbed_official | 15:a81a8d6c1dfe | 451 | * \param[in] module Pointer to software module structure |
mbed_official | 15:a81a8d6c1dfe | 452 | * \param[out] packet Packet to read from master |
mbed_official | 15:a81a8d6c1dfe | 453 | * |
mbed_official | 15:a81a8d6c1dfe | 454 | * \return Status of packet read. |
mbed_official | 15:a81a8d6c1dfe | 455 | * \retval STATUS_OK Packet was read successfully |
mbed_official | 15:a81a8d6c1dfe | 456 | * \retval STATUS_ABORTED Master sent stop condition or repeated |
mbed_official | 15:a81a8d6c1dfe | 457 | * start before specified length of bytes |
mbed_official | 15:a81a8d6c1dfe | 458 | * was received |
mbed_official | 15:a81a8d6c1dfe | 459 | * \retval STATUS_ERR_IO There was an error in the previous transfer |
mbed_official | 15:a81a8d6c1dfe | 460 | * \retval STATUS_ERR_DENIED Start condition not received, another |
mbed_official | 15:a81a8d6c1dfe | 461 | * interrupt flag is set |
mbed_official | 15:a81a8d6c1dfe | 462 | * \retval STATUS_ERR_INVALID_ARG Invalid argument(s) was provided |
mbed_official | 15:a81a8d6c1dfe | 463 | * \retval STATUS_ERR_BUSY The I<SUP>2</SUP>C module is busy with a job |
mbed_official | 15:a81a8d6c1dfe | 464 | * \retval STATUS_ERR_BAD_FORMAT Master wants to read data |
mbed_official | 15:a81a8d6c1dfe | 465 | * \retval STATUS_ERR_ERR_OVERFLOW Last byte received overflows buffer |
mbed_official | 15:a81a8d6c1dfe | 466 | */ |
mbed_official | 15:a81a8d6c1dfe | 467 | enum status_code i2c_slave_read_packet_wait( |
mbed_official | 15:a81a8d6c1dfe | 468 | struct i2c_slave_module *const module, |
mbed_official | 15:a81a8d6c1dfe | 469 | struct i2c_slave_packet *const packet) |
mbed_official | 15:a81a8d6c1dfe | 470 | { |
mbed_official | 15:a81a8d6c1dfe | 471 | /* Sanity check arguments. */ |
mbed_official | 15:a81a8d6c1dfe | 472 | Assert(module); |
mbed_official | 15:a81a8d6c1dfe | 473 | Assert(module->hw); |
mbed_official | 15:a81a8d6c1dfe | 474 | Assert(packet); |
mbed_official | 15:a81a8d6c1dfe | 475 | |
mbed_official | 15:a81a8d6c1dfe | 476 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
mbed_official | 15:a81a8d6c1dfe | 477 | |
mbed_official | 15:a81a8d6c1dfe | 478 | uint16_t length = packet->data_length; |
mbed_official | 15:a81a8d6c1dfe | 479 | |
mbed_official | 15:a81a8d6c1dfe | 480 | if (length == 0) { |
mbed_official | 15:a81a8d6c1dfe | 481 | return STATUS_ERR_INVALID_ARG; |
mbed_official | 15:a81a8d6c1dfe | 482 | } |
mbed_official | 15:a81a8d6c1dfe | 483 | |
mbed_official | 15:a81a8d6c1dfe | 484 | #if I2C_SLAVE_CALLBACK_MODE == true |
mbed_official | 15:a81a8d6c1dfe | 485 | /* Check if the module is busy with a job or AMATCH is enabled */ |
mbed_official | 15:a81a8d6c1dfe | 486 | if (module->buffer_remaining > 0 || |
mbed_official | 15:a81a8d6c1dfe | 487 | (i2c_hw->INTENSET.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
mbed_official | 15:a81a8d6c1dfe | 488 | return STATUS_BUSY; |
mbed_official | 15:a81a8d6c1dfe | 489 | } |
mbed_official | 15:a81a8d6c1dfe | 490 | #endif |
mbed_official | 15:a81a8d6c1dfe | 491 | |
mbed_official | 15:a81a8d6c1dfe | 492 | enum status_code status; |
mbed_official | 15:a81a8d6c1dfe | 493 | |
mbed_official | 15:a81a8d6c1dfe | 494 | /* Wait for master to send address packet */ |
mbed_official | 15:a81a8d6c1dfe | 495 | status = _i2c_slave_wait_for_bus(module); |
mbed_official | 15:a81a8d6c1dfe | 496 | if (status != STATUS_OK) { |
mbed_official | 15:a81a8d6c1dfe | 497 | /* Timeout, return */ |
mbed_official | 15:a81a8d6c1dfe | 498 | return status; |
mbed_official | 15:a81a8d6c1dfe | 499 | } |
mbed_official | 15:a81a8d6c1dfe | 500 | |
mbed_official | 15:a81a8d6c1dfe | 501 | if (!(i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
mbed_official | 15:a81a8d6c1dfe | 502 | /* Not address interrupt, something is wrong */ |
mbed_official | 15:a81a8d6c1dfe | 503 | return STATUS_ERR_DENIED; |
mbed_official | 15:a81a8d6c1dfe | 504 | } |
mbed_official | 15:a81a8d6c1dfe | 505 | |
mbed_official | 15:a81a8d6c1dfe | 506 | /* Check if there was an error in the last transfer */ |
mbed_official | 15:a81a8d6c1dfe | 507 | if (i2c_hw->STATUS.reg & (SERCOM_I2CS_STATUS_BUSERR | |
mbed_official | 15:a81a8d6c1dfe | 508 | SERCOM_I2CS_STATUS_COLL | SERCOM_I2CS_STATUS_LOWTOUT)) { |
mbed_official | 15:a81a8d6c1dfe | 509 | return STATUS_ERR_IO; |
mbed_official | 15:a81a8d6c1dfe | 510 | } |
mbed_official | 15:a81a8d6c1dfe | 511 | /* Check direction */ |
mbed_official | 15:a81a8d6c1dfe | 512 | if ((i2c_hw->STATUS.reg & SERCOM_I2CS_STATUS_DIR)) { |
mbed_official | 15:a81a8d6c1dfe | 513 | /* Read request from master, send NACK and return */ |
mbed_official | 15:a81a8d6c1dfe | 514 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_ACKACT; |
mbed_official | 15:a81a8d6c1dfe | 515 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x3); |
mbed_official | 15:a81a8d6c1dfe | 516 | return STATUS_ERR_BAD_FORMAT; |
mbed_official | 15:a81a8d6c1dfe | 517 | } |
mbed_official | 15:a81a8d6c1dfe | 518 | |
mbed_official | 15:a81a8d6c1dfe | 519 | /* Write request from master, ACK address */ |
mbed_official | 15:a81a8d6c1dfe | 520 | i2c_hw->CTRLB.reg &= ~SERCOM_I2CS_CTRLB_ACKACT; |
mbed_official | 15:a81a8d6c1dfe | 521 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x3); |
mbed_official | 15:a81a8d6c1dfe | 522 | |
mbed_official | 15:a81a8d6c1dfe | 523 | uint16_t i = 0; |
mbed_official | 15:a81a8d6c1dfe | 524 | while (length--) { |
mbed_official | 15:a81a8d6c1dfe | 525 | |
mbed_official | 15:a81a8d6c1dfe | 526 | /* Wait for next byte or stop condition */ |
mbed_official | 15:a81a8d6c1dfe | 527 | status = _i2c_slave_wait_for_bus(module); |
mbed_official | 15:a81a8d6c1dfe | 528 | if (status != STATUS_OK) { |
mbed_official | 15:a81a8d6c1dfe | 529 | /* Timeout, return */ |
mbed_official | 15:a81a8d6c1dfe | 530 | return status; |
mbed_official | 15:a81a8d6c1dfe | 531 | } |
mbed_official | 15:a81a8d6c1dfe | 532 | |
mbed_official | 15:a81a8d6c1dfe | 533 | if ((i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_PREC) || |
mbed_official | 15:a81a8d6c1dfe | 534 | i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH) { |
mbed_official | 15:a81a8d6c1dfe | 535 | /* Master sent stop condition, or repeated start, read done */ |
mbed_official | 15:a81a8d6c1dfe | 536 | /* Clear stop flag */ |
mbed_official | 15:a81a8d6c1dfe | 537 | i2c_hw->INTFLAG.reg = SERCOM_I2CS_INTFLAG_PREC; |
mbed_official | 15:a81a8d6c1dfe | 538 | return STATUS_ABORTED; |
mbed_official | 15:a81a8d6c1dfe | 539 | } |
mbed_official | 15:a81a8d6c1dfe | 540 | |
mbed_official | 15:a81a8d6c1dfe | 541 | /* Read data */ |
mbed_official | 15:a81a8d6c1dfe | 542 | _i2c_slave_wait_for_sync(module); |
mbed_official | 15:a81a8d6c1dfe | 543 | packet->data[i++] = i2c_hw->DATA.reg; |
mbed_official | 15:a81a8d6c1dfe | 544 | |
mbed_official | 15:a81a8d6c1dfe | 545 | } |
mbed_official | 15:a81a8d6c1dfe | 546 | |
mbed_official | 15:a81a8d6c1dfe | 547 | /* Packet read done, wait for packet to NACK, Stop or repeated start */ |
mbed_official | 15:a81a8d6c1dfe | 548 | status = _i2c_slave_wait_for_bus(module); |
mbed_official | 15:a81a8d6c1dfe | 549 | |
mbed_official | 15:a81a8d6c1dfe | 550 | if (i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_DRDY) { |
mbed_official | 15:a81a8d6c1dfe | 551 | /* Buffer is full, send NACK */ |
mbed_official | 15:a81a8d6c1dfe | 552 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_ACKACT; |
mbed_official | 15:a81a8d6c1dfe | 553 | i2c_hw->CTRLB.reg |= SERCOM_I2CS_CTRLB_CMD(0x2); |
mbed_official | 15:a81a8d6c1dfe | 554 | } |
mbed_official | 15:a81a8d6c1dfe | 555 | if (i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_PREC) { |
mbed_official | 15:a81a8d6c1dfe | 556 | /* Clear stop flag */ |
mbed_official | 15:a81a8d6c1dfe | 557 | i2c_hw->INTFLAG.reg = SERCOM_I2CS_INTFLAG_PREC; |
mbed_official | 15:a81a8d6c1dfe | 558 | } |
mbed_official | 15:a81a8d6c1dfe | 559 | return STATUS_OK; |
mbed_official | 15:a81a8d6c1dfe | 560 | } |
mbed_official | 15:a81a8d6c1dfe | 561 | |
mbed_official | 15:a81a8d6c1dfe | 562 | /** |
mbed_official | 15:a81a8d6c1dfe | 563 | * \brief Waits for a start condition on the bus |
mbed_official | 15:a81a8d6c1dfe | 564 | * |
mbed_official | 15:a81a8d6c1dfe | 565 | * \note This function is only available for 7-bit slave addressing. |
mbed_official | 15:a81a8d6c1dfe | 566 | * |
mbed_official | 15:a81a8d6c1dfe | 567 | * Waits for the master to issue a start condition on the bus. |
mbed_official | 15:a81a8d6c1dfe | 568 | * Note that this function does not check for errors in the last transfer, |
mbed_official | 15:a81a8d6c1dfe | 569 | * this will be discovered when reading or writing. |
mbed_official | 15:a81a8d6c1dfe | 570 | * |
mbed_official | 15:a81a8d6c1dfe | 571 | * \param[in] module Pointer to software module structure |
mbed_official | 15:a81a8d6c1dfe | 572 | * |
mbed_official | 15:a81a8d6c1dfe | 573 | * \return Direction of the current transfer, when in slave mode. |
mbed_official | 15:a81a8d6c1dfe | 574 | * \retval I2C_SLAVE_DIRECTION_NONE No request from master within timeout |
mbed_official | 15:a81a8d6c1dfe | 575 | * period |
mbed_official | 15:a81a8d6c1dfe | 576 | * \retval I2C_SLAVE_DIRECTION_READ Write request from master |
mbed_official | 15:a81a8d6c1dfe | 577 | * \retval I2C_SLAVE_DIRECTION_WRITE Read request from master |
mbed_official | 15:a81a8d6c1dfe | 578 | */ |
mbed_official | 15:a81a8d6c1dfe | 579 | enum i2c_slave_direction i2c_slave_get_direction_wait( |
mbed_official | 15:a81a8d6c1dfe | 580 | struct i2c_slave_module *const module) |
mbed_official | 15:a81a8d6c1dfe | 581 | { |
mbed_official | 15:a81a8d6c1dfe | 582 | /* Sanity check arguments. */ |
mbed_official | 15:a81a8d6c1dfe | 583 | Assert(module); |
mbed_official | 15:a81a8d6c1dfe | 584 | Assert(module->hw); |
mbed_official | 15:a81a8d6c1dfe | 585 | |
mbed_official | 15:a81a8d6c1dfe | 586 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
mbed_official | 15:a81a8d6c1dfe | 587 | |
mbed_official | 15:a81a8d6c1dfe | 588 | enum status_code status; |
mbed_official | 15:a81a8d6c1dfe | 589 | |
mbed_official | 15:a81a8d6c1dfe | 590 | /* Wait for address interrupt */ |
mbed_official | 15:a81a8d6c1dfe | 591 | status = _i2c_slave_wait_for_bus(module); |
mbed_official | 15:a81a8d6c1dfe | 592 | |
mbed_official | 15:a81a8d6c1dfe | 593 | if (status != STATUS_OK) { |
mbed_official | 15:a81a8d6c1dfe | 594 | /* Timeout, return */ |
mbed_official | 15:a81a8d6c1dfe | 595 | return I2C_SLAVE_DIRECTION_NONE; |
mbed_official | 15:a81a8d6c1dfe | 596 | } |
mbed_official | 15:a81a8d6c1dfe | 597 | |
mbed_official | 15:a81a8d6c1dfe | 598 | if (!(i2c_hw->INTFLAG.reg & SERCOM_I2CS_INTFLAG_AMATCH)) { |
mbed_official | 15:a81a8d6c1dfe | 599 | /* Not address interrupt, something is wrong */ |
mbed_official | 15:a81a8d6c1dfe | 600 | return I2C_SLAVE_DIRECTION_NONE; |
mbed_official | 15:a81a8d6c1dfe | 601 | } |
mbed_official | 15:a81a8d6c1dfe | 602 | |
mbed_official | 15:a81a8d6c1dfe | 603 | /* Check direction */ |
mbed_official | 15:a81a8d6c1dfe | 604 | if ((i2c_hw->STATUS.reg & SERCOM_I2CS_STATUS_DIR)) { |
mbed_official | 15:a81a8d6c1dfe | 605 | /* Read request from master */ |
mbed_official | 15:a81a8d6c1dfe | 606 | return I2C_SLAVE_DIRECTION_WRITE; |
mbed_official | 15:a81a8d6c1dfe | 607 | } else { |
mbed_official | 15:a81a8d6c1dfe | 608 | /* Write request from master */ |
mbed_official | 15:a81a8d6c1dfe | 609 | return I2C_SLAVE_DIRECTION_READ; |
mbed_official | 15:a81a8d6c1dfe | 610 | } |
mbed_official | 15:a81a8d6c1dfe | 611 | } |
mbed_official | 15:a81a8d6c1dfe | 612 | |
mbed_official | 15:a81a8d6c1dfe | 613 | /** |
mbed_official | 15:a81a8d6c1dfe | 614 | * \brief Retrieves the current module status |
mbed_official | 15:a81a8d6c1dfe | 615 | * |
mbed_official | 15:a81a8d6c1dfe | 616 | * Checks the status of the module and returns it as a bitmask of status |
mbed_official | 15:a81a8d6c1dfe | 617 | * flags. |
mbed_official | 15:a81a8d6c1dfe | 618 | * |
mbed_official | 15:a81a8d6c1dfe | 619 | * \param[in] module Pointer to the I<SUP>2</SUP>C slave software device struct |
mbed_official | 15:a81a8d6c1dfe | 620 | * |
mbed_official | 15:a81a8d6c1dfe | 621 | * \return Bitmask of status flags. |
mbed_official | 15:a81a8d6c1dfe | 622 | * |
mbed_official | 15:a81a8d6c1dfe | 623 | * \retval I2C_SLAVE_STATUS_ADDRESS_MATCH A valid address has been received |
mbed_official | 15:a81a8d6c1dfe | 624 | * \retval I2C_SLAVE_STATUS_DATA_READY A I<SUP>2</SUP>C slave byte transmission is |
mbed_official | 15:a81a8d6c1dfe | 625 | * successfully completed |
mbed_official | 15:a81a8d6c1dfe | 626 | * \retval I2C_SLAVE_STATUS_STOP_RECEIVED A stop condition is detected for a |
mbed_official | 15:a81a8d6c1dfe | 627 | * transaction being processed |
mbed_official | 15:a81a8d6c1dfe | 628 | * \retval I2C_SLAVE_STATUS_CLOCK_HOLD The slave is holding the SCL line |
mbed_official | 15:a81a8d6c1dfe | 629 | * low |
mbed_official | 15:a81a8d6c1dfe | 630 | * \retval I2C_SLAVE_STATUS_SCL_LOW_TIMEOUT An SCL low time-out has occurred |
mbed_official | 15:a81a8d6c1dfe | 631 | * \retval I2C_SLAVE_STATUS_REPEATED_START Indicates a repeated start, only |
mbed_official | 15:a81a8d6c1dfe | 632 | * valid if \ref |
mbed_official | 15:a81a8d6c1dfe | 633 | * I2C_SLAVE_STATUS_ADDRESS_MATCH is |
mbed_official | 15:a81a8d6c1dfe | 634 | * set |
mbed_official | 15:a81a8d6c1dfe | 635 | * \retval I2C_SLAVE_STATUS_RECEIVED_NACK The last data packet sent was not |
mbed_official | 15:a81a8d6c1dfe | 636 | * acknowledged |
mbed_official | 15:a81a8d6c1dfe | 637 | * \retval I2C_SLAVE_STATUS_COLLISION The I<SUP>2</SUP>C slave was not able to |
mbed_official | 15:a81a8d6c1dfe | 638 | * transmit a high data or NACK bit |
mbed_official | 15:a81a8d6c1dfe | 639 | * \retval I2C_SLAVE_STATUS_BUS_ERROR An illegal bus condition has |
mbed_official | 15:a81a8d6c1dfe | 640 | * occurred on the bus |
mbed_official | 15:a81a8d6c1dfe | 641 | */ |
mbed_official | 15:a81a8d6c1dfe | 642 | uint32_t i2c_slave_get_status( |
mbed_official | 15:a81a8d6c1dfe | 643 | struct i2c_slave_module *const module) |
mbed_official | 15:a81a8d6c1dfe | 644 | { |
mbed_official | 15:a81a8d6c1dfe | 645 | /* Sanity check arguments */ |
mbed_official | 15:a81a8d6c1dfe | 646 | Assert(module); |
mbed_official | 15:a81a8d6c1dfe | 647 | Assert(module->hw); |
mbed_official | 15:a81a8d6c1dfe | 648 | |
mbed_official | 15:a81a8d6c1dfe | 649 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
mbed_official | 15:a81a8d6c1dfe | 650 | |
mbed_official | 15:a81a8d6c1dfe | 651 | uint8_t intflags = i2c_hw->INTFLAG.reg; |
mbed_official | 15:a81a8d6c1dfe | 652 | uint8_t status = i2c_hw->STATUS.reg; |
mbed_official | 15:a81a8d6c1dfe | 653 | uint32_t status_flags = 0; |
mbed_official | 15:a81a8d6c1dfe | 654 | |
mbed_official | 15:a81a8d6c1dfe | 655 | /* Check Address Match flag */ |
mbed_official | 15:a81a8d6c1dfe | 656 | if (intflags & SERCOM_I2CS_INTFLAG_AMATCH) { |
mbed_official | 15:a81a8d6c1dfe | 657 | status_flags |= I2C_SLAVE_STATUS_ADDRESS_MATCH; |
mbed_official | 15:a81a8d6c1dfe | 658 | } |
mbed_official | 15:a81a8d6c1dfe | 659 | /* Check Data Ready flag */ |
mbed_official | 15:a81a8d6c1dfe | 660 | if (intflags & SERCOM_I2CS_INTFLAG_DRDY) { |
mbed_official | 15:a81a8d6c1dfe | 661 | status_flags |= I2C_SLAVE_STATUS_DATA_READY; |
mbed_official | 15:a81a8d6c1dfe | 662 | } |
mbed_official | 15:a81a8d6c1dfe | 663 | /* Check Stop flag */ |
mbed_official | 15:a81a8d6c1dfe | 664 | if (intflags & SERCOM_I2CS_INTFLAG_PREC) { |
mbed_official | 15:a81a8d6c1dfe | 665 | status_flags |= I2C_SLAVE_STATUS_STOP_RECEIVED; |
mbed_official | 15:a81a8d6c1dfe | 666 | } |
mbed_official | 15:a81a8d6c1dfe | 667 | /* Check Clock Hold */ |
mbed_official | 15:a81a8d6c1dfe | 668 | if (status & SERCOM_I2CS_STATUS_CLKHOLD) { |
mbed_official | 15:a81a8d6c1dfe | 669 | status_flags |= I2C_SLAVE_STATUS_CLOCK_HOLD; |
mbed_official | 15:a81a8d6c1dfe | 670 | } |
mbed_official | 15:a81a8d6c1dfe | 671 | /* Check SCL Low Timeout */ |
mbed_official | 15:a81a8d6c1dfe | 672 | if (status & SERCOM_I2CS_STATUS_LOWTOUT) { |
mbed_official | 15:a81a8d6c1dfe | 673 | status_flags |= I2C_SLAVE_STATUS_SCL_LOW_TIMEOUT; |
mbed_official | 15:a81a8d6c1dfe | 674 | } |
mbed_official | 15:a81a8d6c1dfe | 675 | /* Check Repeated Start */ |
mbed_official | 15:a81a8d6c1dfe | 676 | if (status & SERCOM_I2CS_STATUS_SR) { |
mbed_official | 15:a81a8d6c1dfe | 677 | status_flags |= I2C_SLAVE_STATUS_REPEATED_START; |
mbed_official | 15:a81a8d6c1dfe | 678 | } |
mbed_official | 15:a81a8d6c1dfe | 679 | /* Check Received Not Acknowledge */ |
mbed_official | 15:a81a8d6c1dfe | 680 | if (status & SERCOM_I2CS_STATUS_RXNACK) { |
mbed_official | 15:a81a8d6c1dfe | 681 | status_flags |= I2C_SLAVE_STATUS_RECEIVED_NACK; |
mbed_official | 15:a81a8d6c1dfe | 682 | } |
mbed_official | 15:a81a8d6c1dfe | 683 | /* Check Transmit Collision */ |
mbed_official | 15:a81a8d6c1dfe | 684 | if (status & SERCOM_I2CS_STATUS_COLL) { |
mbed_official | 15:a81a8d6c1dfe | 685 | status_flags |= I2C_SLAVE_STATUS_COLLISION; |
mbed_official | 15:a81a8d6c1dfe | 686 | } |
mbed_official | 15:a81a8d6c1dfe | 687 | /* Check Bus Error */ |
mbed_official | 15:a81a8d6c1dfe | 688 | if (status & SERCOM_I2CS_STATUS_BUSERR) { |
mbed_official | 15:a81a8d6c1dfe | 689 | status_flags |= I2C_SLAVE_STATUS_BUS_ERROR; |
mbed_official | 15:a81a8d6c1dfe | 690 | } |
mbed_official | 15:a81a8d6c1dfe | 691 | |
mbed_official | 15:a81a8d6c1dfe | 692 | return status_flags; |
mbed_official | 15:a81a8d6c1dfe | 693 | } |
mbed_official | 15:a81a8d6c1dfe | 694 | |
mbed_official | 15:a81a8d6c1dfe | 695 | /** |
mbed_official | 15:a81a8d6c1dfe | 696 | * \brief Clears a module status flag |
mbed_official | 15:a81a8d6c1dfe | 697 | * |
mbed_official | 15:a81a8d6c1dfe | 698 | * Clears the given status flag of the module. |
mbed_official | 15:a81a8d6c1dfe | 699 | * |
mbed_official | 15:a81a8d6c1dfe | 700 | * \note Not all status flags can be cleared. |
mbed_official | 15:a81a8d6c1dfe | 701 | * |
mbed_official | 15:a81a8d6c1dfe | 702 | * \param[in] module Pointer to the I<SUP>2</SUP>C software device struct |
mbed_official | 15:a81a8d6c1dfe | 703 | * \param[in] status_flags Bit mask of status flags to clear |
mbed_official | 15:a81a8d6c1dfe | 704 | * |
mbed_official | 15:a81a8d6c1dfe | 705 | */ |
mbed_official | 15:a81a8d6c1dfe | 706 | void i2c_slave_clear_status( |
mbed_official | 15:a81a8d6c1dfe | 707 | struct i2c_slave_module *const module, |
mbed_official | 15:a81a8d6c1dfe | 708 | uint32_t status_flags) |
mbed_official | 15:a81a8d6c1dfe | 709 | { |
mbed_official | 15:a81a8d6c1dfe | 710 | /* Sanity check arguments */ |
mbed_official | 15:a81a8d6c1dfe | 711 | Assert(module); |
mbed_official | 15:a81a8d6c1dfe | 712 | Assert(module->hw); |
mbed_official | 15:a81a8d6c1dfe | 713 | |
mbed_official | 15:a81a8d6c1dfe | 714 | SercomI2cs *const i2c_hw = &(module->hw->I2CS); |
mbed_official | 15:a81a8d6c1dfe | 715 | |
mbed_official | 15:a81a8d6c1dfe | 716 | /* Clear Address Match flag */ |
mbed_official | 15:a81a8d6c1dfe | 717 | if (status_flags & I2C_SLAVE_STATUS_ADDRESS_MATCH) { |
mbed_official | 15:a81a8d6c1dfe | 718 | i2c_hw->INTFLAG.reg = SERCOM_I2CS_INTFLAG_AMATCH; |
mbed_official | 15:a81a8d6c1dfe | 719 | } |
mbed_official | 15:a81a8d6c1dfe | 720 | /* Clear Data Ready flag */ |
mbed_official | 15:a81a8d6c1dfe | 721 | if (status_flags & I2C_SLAVE_STATUS_DATA_READY) { |
mbed_official | 15:a81a8d6c1dfe | 722 | i2c_hw->INTFLAG.reg = SERCOM_I2CS_INTFLAG_DRDY; |
mbed_official | 15:a81a8d6c1dfe | 723 | } |
mbed_official | 15:a81a8d6c1dfe | 724 | /* Clear Stop flag */ |
mbed_official | 15:a81a8d6c1dfe | 725 | if (status_flags & I2C_SLAVE_STATUS_STOP_RECEIVED) { |
mbed_official | 15:a81a8d6c1dfe | 726 | i2c_hw->INTFLAG.reg = SERCOM_I2CS_INTFLAG_PREC; |
mbed_official | 15:a81a8d6c1dfe | 727 | } |
mbed_official | 15:a81a8d6c1dfe | 728 | /* Clear SCL Low Timeout */ |
mbed_official | 15:a81a8d6c1dfe | 729 | if (status_flags & I2C_SLAVE_STATUS_SCL_LOW_TIMEOUT) { |
mbed_official | 15:a81a8d6c1dfe | 730 | i2c_hw->STATUS.reg = SERCOM_I2CS_STATUS_LOWTOUT; |
mbed_official | 15:a81a8d6c1dfe | 731 | } |
mbed_official | 15:a81a8d6c1dfe | 732 | /* Clear Transmit Collision */ |
mbed_official | 15:a81a8d6c1dfe | 733 | if (status_flags & I2C_SLAVE_STATUS_COLLISION) { |
mbed_official | 15:a81a8d6c1dfe | 734 | i2c_hw->STATUS.reg = SERCOM_I2CS_STATUS_COLL; |
mbed_official | 15:a81a8d6c1dfe | 735 | } |
mbed_official | 15:a81a8d6c1dfe | 736 | /* Clear Bus Error */ |
mbed_official | 15:a81a8d6c1dfe | 737 | if (status_flags & I2C_SLAVE_STATUS_BUS_ERROR) { |
mbed_official | 15:a81a8d6c1dfe | 738 | i2c_hw->STATUS.reg = SERCOM_I2CS_STATUS_BUSERR; |
mbed_official | 15:a81a8d6c1dfe | 739 | } |
mbed_official | 15:a81a8d6c1dfe | 740 | } |