mirror of https://github.com/ARMmbed/mbed-os.git
[LPC1549] Added I2C master support
ytsuboi
parent
95f4057499
commit
a2f2f44258
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@ -28,7 +28,7 @@
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#define DEVICE_SERIAL 1
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#define DEVICE_SERIAL_FC 1
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#define DEVICE_I2C 0
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#define DEVICE_I2C 1
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#define DEVICE_I2CSLAVE 0
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#define DEVICE_SPI 1
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@ -0,0 +1,258 @@
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/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "i2c_api.h"
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#include "cmsis.h"
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#include "pinmap.h"
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#include "error.h"
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static uint8_t repeated_start = 0;
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#define I2C_STAT(x) ((LPC_I2C0->STAT >> 1) & (0x07))
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static inline int i2c_status(i2c_t *obj) {
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return I2C_STAT(obj);
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}
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// Wait until the Serial Interrupt (SI) is set
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static int i2c_wait_SI(i2c_t *obj) {
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int timeout = 0;
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while (!(LPC_I2C0->STAT & (1 << 0))) {
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timeout++;
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if (timeout > 100000) return -1;
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}
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return 0;
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}
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static inline void i2c_interface_enable(i2c_t *obj) {
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LPC_I2C0->CFG |= (1 << 0);
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}
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static inline void i2c_power_enable(i2c_t *obj) {
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// Enables clock for I2C0
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LPC_SYSCON->SYSAHBCLKCTRL1 |= (1<<13);
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// LPC_SYSCON->PRESETCTRL1 &= ~(0x1<<13);
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LPC_SYSCON->PRESETCTRL1 |= (0x1<<13);
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LPC_SYSCON->PRESETCTRL1 &= ~(0x1 << 13);
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}
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void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
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// ピン定義の確認どうしよう…
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// enable power
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i2c_power_enable(obj);
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// pin enable
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LPC_SWM->PINENABLE1 &= ~(0x3 << 3);
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// set default frequency at 100k
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i2c_frequency(obj, 100000);
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i2c_interface_enable(obj);
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}
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inline int i2c_start(i2c_t *obj) {
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int status = 0;
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if (repeated_start) {
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LPC_I2C0->MSTCTL = (1 << 1) | (1 << 0);
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repeated_start = 0;
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} else {
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LPC_I2C0->MSTCTL = (1 << 1);
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}
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return status;
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}
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inline int i2c_stop(i2c_t *obj) {
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int timeout = 0;
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LPC_I2C0->MSTCTL = (1 << 2) | (1 << 0);
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while ((LPC_I2C0->STAT & ((1 << 0) | (7 << 1))) != ((1 << 0) | (0 << 1))) {
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timeout ++;
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if (timeout > 100000) return 1;
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}
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return 0;
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}
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static inline int i2c_do_write(i2c_t *obj, int value, uint8_t addr) {
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// write the data
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LPC_I2C0->MSTDAT = value;
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if (!addr)
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LPC_I2C0->MSTCTL = (1 << 0);
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// wait and return status
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i2c_wait_SI(obj);
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return i2c_status(obj);
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}
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static inline int i2c_do_read(i2c_t *obj, int last) {
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// wait for it to arrive
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i2c_wait_SI(obj);
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if (!last)
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LPC_I2C0->MSTCTL = (1 << 0);
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// return the data
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//return (I2C_DAT(obj) & 0xFF);
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return (LPC_I2C0->MSTDAT & 0xFF);
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}
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void i2c_frequency(i2c_t *obj, int hz) {
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// No peripheral clock divider on the M0
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uint32_t PCLK = SystemCoreClock;
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uint32_t clkdiv = PCLK / (hz * 4) - 1;
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LPC_I2C0->DIV = clkdiv;
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LPC_I2C0->MSTTIME = 0;
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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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int count, status;
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int timeout = 0;
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i2c_start(obj);
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//status = i2c_do_write(obj, (address | 0x01), 1);
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LPC_I2C0->MSTDAT = (address | 0x01);
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LPC_I2C0->MSTCTL |= 0x20;
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while (!(LPC_I2C0->STAT & (1 << 0))) {
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timeout++;
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if (timeout > 100000) return -1;
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}
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status = ((LPC_I2C0->STAT >> 1) & (0x07));
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if (status != 0x01) {
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i2c_stop(obj);
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return I2C_ERROR_NO_SLAVE;
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}
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// Read in all except last byte
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for (count = 0; count < (length - 1); count++) {
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//int value = i2c_do_read(obj, 0);
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while (!(LPC_I2C0->STAT & (1 << 0))) {
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timeout++;
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if (timeout > 100000) return -1;
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}
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if (!0)
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LPC_I2C0->MSTCTL = (1 << 0);
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data[count] = (LPC_I2C0->MSTDAT & 0xFF);
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//
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status = ((LPC_I2C0->STAT >> 1) & (0x07));
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if (status != 0x00) {
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i2c_stop(obj);
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return count;
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}
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//data[count] = (char) value;
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}
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// read in last byte
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//int value = i2c_do_read(obj, 1);
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while (!(LPC_I2C0->STAT & (1 << 0))) {
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timeout++;
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if (timeout > 100000) return -1;
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}
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data[count] = (LPC_I2C0->MSTDAT & 0xFF);
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//
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status = i2c_status(obj);
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if (status != 0x01) {
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i2c_stop(obj);
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return length - 1;
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}
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//data[count] = (char) value;
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// If not repeated start, send stop.
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if (stop) {
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i2c_stop(obj);
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} else {
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repeated_start = 1;
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}
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return length;
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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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int i, status;
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int timeout = 0;
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i2c_start(obj);
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//status = i2c_do_write(obj, (address & 0xFE), 1);
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LPC_I2C0->MSTDAT = (address & 0xFE);
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LPC_I2C0->MSTCTL |= 0x20;
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// wait and return status
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while (!(LPC_I2C0->STAT & (1 << 0))) {
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timeout++;
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if (timeout > 100000) return -1;
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}
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status = ((LPC_I2C0->STAT >> 1) & (0x07));
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if (status != 0x02) {
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i2c_stop(obj);
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return I2C_ERROR_NO_SLAVE;
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}
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for (i=0; i<length; i++) {
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//status = i2c_do_write(obj, data[i], 0);
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LPC_I2C0->MSTDAT = data[i];
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LPC_I2C0->MSTCTL = (1 << 0);
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// wait and return status
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while (!(LPC_I2C0->STAT & (1 << 0))) {
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timeout++;
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if (timeout > 100000) return -1;
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}
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status = ((LPC_I2C0->STAT >> 1) & (0x07));
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if (status != 0x02) {
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i2c_stop(obj);
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return i;
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}
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}
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// If not repeated start, send stop.
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if (stop) {
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i2c_stop(obj);
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} else {
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repeated_start = 1;
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}
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return length;
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}
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void i2c_reset(i2c_t *obj) {
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i2c_stop(obj);
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}
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int i2c_byte_read(i2c_t *obj, int last) {
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return (i2c_do_read(obj, last) & 0xFF);
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}
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int i2c_byte_write(i2c_t *obj, int data) {
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int ack;
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int status = i2c_do_write(obj, (data & 0xFF), 0);
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switch(status) {
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case 2:
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ack = 1;
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break;
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default:
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ack = 0;
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break;
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}
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return ack;
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}
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