mirror of https://github.com/ARMmbed/mbed-os.git
233 lines
7.1 KiB
C
233 lines
7.1 KiB
C
/*******************************************************************************
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* Copyright (c) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*******************************************************************************
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*/
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#include "mbed_assert.h"
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#include "i2c_api.h"
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#if DEVICE_I2C
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#include "i2cm_regs.h"
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#include "i2cm.h"
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#include "pinmap.h"
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#include "PeripheralPins.h"
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#ifndef MXC_I2CM_RX_TIMEOUT
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#define MXC_I2CM_RX_TIMEOUT 0x5000
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#endif
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#define MBED_NAK 0
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#define MBED_ACK 1
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#define MBED_TIMEOUT 2
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//******************************************************************************
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void i2c_init(i2c_t *obj, PinName sda, PinName scl)
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{
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// SDA and SCL must map to same peripheral instance
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I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
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I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
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mxc_i2cm_regs_t *i2c = (mxc_i2cm_regs_t*)pinmap_merge(i2c_sda, i2c_scl);
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MBED_ASSERT((int)i2c != NC);
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obj->i2c = i2c;
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obj->fifo = MXC_I2CM_GET_FIFO(MXC_I2CM_GET_IDX(i2c));
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obj->start_pending = 0;
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// Merge pin function requests for use with CMSIS init func
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ioman_req_t io_req;
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pin_function_t *pin_func;
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pin_func = (pin_function_t *)pinmap_find_function(sda, PinMap_I2C_SDA);
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io_req.value = pin_func->req_val;
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pin_func = (pin_function_t *)pinmap_find_function(scl, PinMap_I2C_SCL);
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io_req.value |= pin_func->req_val;
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obj->sys_cfg.io_cfg.req_reg = pin_func->reg_req;
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obj->sys_cfg.io_cfg.ack_reg = pin_func->reg_ack;
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obj->sys_cfg.io_cfg.req_val = io_req;
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obj->sys_cfg.clk_scale = CLKMAN_SCALE_DIV_1;
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I2CM_Init(obj->i2c, &obj->sys_cfg, I2CM_SPEED_100KHZ);
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}
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//******************************************************************************
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void i2c_frequency(i2c_t *obj, int hz)
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{
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I2CM_Init(obj->i2c, &obj->sys_cfg, (i2cm_speed_t)hz);
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}
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//******************************************************************************
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int i2c_start(i2c_t *obj)
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{
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obj->start_pending = 1;
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return 0;
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}
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//******************************************************************************
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int i2c_stop(i2c_t *obj)
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{
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obj->start_pending = 0;
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I2CM_WriteTxFifo(obj->i2c, obj->fifo, MXC_S_I2CM_TRANS_TAG_STOP);
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I2CM_TxInProgress(obj->i2c);
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return 0;
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}
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//******************************************************************************
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int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
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{
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return I2CM_Read(obj->i2c, address >> 1, NULL, 0, (uint8_t *)data, length, stop);
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}
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//******************************************************************************
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int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
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{
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mxc_i2cm_regs_t *i2cm = obj->i2c;
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mxc_i2cm_fifo_regs_t *fifo = obj->fifo;
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if (stop) {
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return I2CM_Write(i2cm, address >> 1, NULL, 0, (uint8_t *)data, length);
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}
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i2cm->inten = 0;
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i2cm->intfl = i2cm->intfl;
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if (I2CM_Tx(i2cm, fifo, address >> 1, (uint8_t *)data, length, 0) == E_NO_ERROR) {
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return length;
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} else {
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return -1;
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}
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}
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//******************************************************************************
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void i2c_reset(i2c_t *obj)
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{
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I2CM_Recover(obj->i2c);
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}
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//******************************************************************************
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int i2c_byte_read(i2c_t *obj, int last)
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{
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mxc_i2cm_regs_t *i2cm = obj->i2c;
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mxc_i2cm_fifo_regs_t *fifo = obj->fifo;
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int tmp;
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// Start the transaction if it is not currently ongoing
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if (!(i2cm->trans & MXC_F_I2CM_TRANS_TX_IN_PROGRESS)) {
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i2cm->trans |= MXC_F_I2CM_TRANS_TX_START;
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}
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if (last) {
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// NACK the last read byte
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if (I2CM_WriteTxFifo(i2cm, fifo, MXC_S_I2CM_TRANS_TAG_RXDATA_NACK) != E_NO_ERROR) {
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goto byte_read_err;
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}
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} else {
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if (I2CM_WriteTxFifo(i2cm, fifo, MXC_S_I2CM_TRANS_TAG_RXDATA_COUNT) != E_NO_ERROR) {
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goto byte_read_err;
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}
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}
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do {
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// Wait for data in RX FIFO
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int timeout = MXC_I2CM_RX_TIMEOUT;
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while (!(i2cm->intfl & MXC_F_I2CM_INTFL_RX_FIFO_NOT_EMPTY) &&
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((i2cm->bb & MXC_F_I2CM_BB_RX_FIFO_CNT) == 0)) {
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if((timeout-- < 0) || (i2cm->trans & MXC_F_I2CM_TRANS_TX_TIMEOUT)) {
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goto byte_read_err;
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}
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if (i2cm->trans & (MXC_F_I2CM_TRANS_TX_LOST_ARBITR | MXC_F_I2CM_TRANS_TX_NACKED)) {
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goto byte_read_err;
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}
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}
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i2cm->intfl = MXC_F_I2CM_INTFL_RX_FIFO_NOT_EMPTY;
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} while ((tmp = fifo->rx) & MXC_S_I2CM_RSTLS_TAG_EMPTY);
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return (uint8_t)tmp;
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byte_read_err:
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i2c_reset(obj);
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return -1;
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}
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//******************************************************************************
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int i2c_byte_write(i2c_t *obj, int data)
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{
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mxc_i2cm_regs_t *i2cm = obj->i2c;
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mxc_i2cm_fifo_regs_t *fifo = obj->fifo;
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int result;
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if (obj->start_pending) {
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obj->start_pending = 0;
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data |= MXC_S_I2CM_TRANS_TAG_START;
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} else {
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data |= MXC_S_I2CM_TRANS_TAG_TXDATA_ACK;
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}
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if ((result = I2CM_WriteTxFifo(i2cm, fifo, data)) != E_NO_ERROR) {
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i2c_reset(obj);
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if (result == E_COMM_ERR) {
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return MBED_NAK;
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}
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return MBED_TIMEOUT;
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}
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// Start the transaction if it is not currently ongoing
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if (!(i2cm->trans & MXC_F_I2CM_TRANS_TX_IN_PROGRESS)) {
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i2cm->trans |= MXC_F_I2CM_TRANS_TX_START;
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}
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return MBED_ACK;
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}
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const PinMap *i2c_master_sda_pinmap()
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{
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return PinMap_I2C_SDA;
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}
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const PinMap *i2c_master_scl_pinmap()
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{
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return PinMap_I2C_SCL;
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}
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const PinMap *i2c_slave_sda_pinmap()
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{
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return PinMap_I2C_SDA;
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}
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const PinMap *i2c_slave_scl_pinmap()
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{
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return PinMap_I2C_SCL;
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}
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#endif // #if DEVICE_I2C
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