/* * Copyright (c) 2020 SparkFun Electronics * SPDX-License-Identifier: MIT * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #if DEVICE_I2C #include "i2c_api.h" #include "iom_api.h" #include "PeripheralPins.h" #include "mbed_assert.h" #define DEFAULT_CLK_FREQ (AM_HAL_IOM_400KHZ) static am_hal_iom_transfer_t xfer = {0}; I2CName i2c_get_peripheral_name(PinName sda, PinName scl) { uint32_t iom_sda = pinmap_peripheral(sda, i2c_master_sda_pinmap()); uint32_t iom_scl = pinmap_peripheral(scl, i2c_master_scl_pinmap()); uint32_t iom = pinmap_merge(iom_sda, iom_scl); if ((int)iom == NC) { return IOM_NUM; } return (I2CName)iom; } void i2c_init(i2c_t *obj, PinName sda, PinName scl) { MBED_ASSERT(obj); // iom determination I2CName iom = i2c_get_peripheral_name(sda, scl); MBED_ASSERT((int)iom != IOM_NUM); // iom configuration obj->i2c.iom_obj.iom.inst = (uint32_t)iom; obj->i2c.iom_obj.iom.cfg.eInterfaceMode = AM_HAL_IOM_I2C_MODE; obj->i2c.iom_obj.iom.cfg.ui32ClockFreq = DEFAULT_CLK_FREQ; obj->i2c.iom_obj.iom.cfg.pNBTxnBuf = NULL; obj->i2c.iom_obj.iom.cfg.ui32NBTxnBufLength = 0; // pin configuration if ((int)sda != NC) { pinmap_config(sda, i2c_master_sda_pinmap()); } if ((int)scl != NC) { pinmap_config(scl, i2c_master_scl_pinmap()); } // invariant xfer settings xfer.ui32InstrLen = 0; xfer.ui32Instr = 0; xfer.ui8RepeatCount = 0; xfer.ui8Priority = 1; xfer.ui32PauseCondition = 0; xfer.ui32StatusSetClr = 0; // initialization iom_init(&obj->i2c.iom_obj); } void i2c_free(i2c_t *obj) { MBED_ASSERT(obj); iom_deinit(&obj->i2c.iom_obj); } void i2c_frequency(i2c_t *obj, int hz) { MBED_ASSERT(obj); if (hz > AM_HAL_IOM_MAX_FREQ) { hz = AM_HAL_IOM_MAX_FREQ; } obj->i2c.iom_obj.iom.cfg.ui32ClockFreq = hz; iom_init(&obj->i2c.iom_obj); } int i2c_start(i2c_t *obj) { MBED_ASSERT(obj); MBED_ASSERT(0); return I2C_ERROR_NO_SLAVE; } int i2c_stop(i2c_t *obj) { MBED_ASSERT(obj); MBED_ASSERT(0); return I2C_ERROR_NO_SLAVE; } int i2c_read(i2c_t *obj, int address8bit, char *data, int length, int stop) { MBED_ASSERT(obj); int handled_chars = 0; xfer.uPeerInfo.ui32I2CDevAddr = (address8bit >> 1); xfer.eDirection = AM_HAL_IOM_RX; xfer.ui32NumBytes = length; xfer.pui32RxBuffer = (uint32_t *)data; xfer.pui32TxBuffer = NULL; xfer.bContinue = (stop) ? false : true; uint32_t status = am_hal_iom_blocking_transfer(obj->i2c.iom_obj.iom.handle, &xfer); if (AM_HAL_STATUS_SUCCESS != status) { return I2C_ERROR_NO_SLAVE; } handled_chars += xfer.ui32NumBytes; return handled_chars; } int i2c_write(i2c_t *obj, int address8bit, const char *data, int length, int stop) { MBED_ASSERT(obj); int handled_chars = 0; xfer.uPeerInfo.ui32I2CDevAddr = (address8bit >> 1); xfer.eDirection = AM_HAL_IOM_TX; xfer.ui32NumBytes = length; xfer.pui32TxBuffer = (uint32_t *)data; xfer.pui32RxBuffer = NULL; xfer.bContinue = (stop) ? false : true; uint32_t status = am_hal_iom_blocking_transfer(obj->i2c.iom_obj.iom.handle, &xfer); if (AM_HAL_STATUS_SUCCESS != status) { return I2C_ERROR_NO_SLAVE; } handled_chars += xfer.ui32NumBytes; return handled_chars; } void i2c_reset(i2c_t *obj) { MBED_ASSERT(obj); MBED_ASSERT(0); } int i2c_byte_read(i2c_t *obj, int last) { MBED_ASSERT(obj); MBED_ASSERT(0); return I2C_ERROR_NO_SLAVE; } int i2c_byte_write(i2c_t *obj, int data) { MBED_ASSERT(obj); MBED_ASSERT(0); return I2C_ERROR_NO_SLAVE; } const PinMap *i2c_master_sda_pinmap(void) { return PinMap_I2C_SDA; } const PinMap *i2c_master_scl_pinmap(void) { return PinMap_I2C_SCL; } const PinMap *i2c_slave_sda_pinmap(void) { return PinMap_I2C_SDA; } const PinMap *i2c_slave_scl_pinmap(void) { return PinMap_I2C_SCL; } #endif // DEVICE_I2C