kopia lustrzana https://github.com/OpenRTX/OpenRTX
Driver for MK22FN512xx I2C0 peripheral
Silvano Seva
rodzic
5581276ec5
commit
56d56e901f
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@ -122,6 +122,7 @@ mk22fn512_src = ['platform/mcu/MK22FN512xxx12/boot/startup.c',
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'platform/mcu/MK22FN512xxx12/drivers/gpio.c',
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'platform/mcu/MK22FN512xxx12/drivers/delays.c',
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'platform/mcu/MK22FN512xxx12/drivers/rtc.c',
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'platform/mcu/MK22FN512xxx12/drivers/I2C0.c',
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'platform/mcu/MK22FN512xxx12/drivers/usb/usb_device_cdc_acm.c',
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'platform/mcu/MK22FN512xxx12/drivers/usb/usb_device_ch9.c',
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'platform/mcu/MK22FN512xxx12/drivers/usb/usb_device_dci.c',
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@ -0,0 +1,112 @@
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/***************************************************************************
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* Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include "I2C0.h"
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#include <MK22F51212.h>
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void i2c0_init()
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{
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SIM->SCGC4 |= SIM_SCGC4_I2C0(1);
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I2C0->A1 = 0; /* Module address when in slave mode */
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I2C0->F = 0x2C; /* Divide bus clock by 576 */
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I2C0->C1 |= I2C_C1_IICEN(1); /* Enable I2C module */
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}
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void i2c0_terminate()
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{
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while(I2C0->S & I2C_S_BUSY(1)) ; /* Wait for bus free */
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I2C0->C1 &= ~I2C_C1_IICEN(1);
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SIM->SCGC4 &= ~SIM_SCGC4_I2C0(1);
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}
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void i2c0_write(uint8_t addr, void* buf, size_t len, bool sendStop)
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{
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I2C0->C1 |= I2C_C1_TX_MASK /* Transmit data */
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| I2C_C1_MST_MASK; /* Master mode */
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I2C0->D = addr & 0xFE;
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for(size_t i = 0; i < len; i++)
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{
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while((I2C0->S & I2C_S_IICIF_MASK) == 0) ; /* IICIF set on tx completion */
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I2C0->S |= I2C_S_IICIF_MASK; /* Clear IICIF flag */
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I2C0->D = ((char *) buf)[i];
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}
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while((I2C0->S & I2C_S_IICIF_MASK) == 0) ; /* Wait for last byte */
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I2C0->S |= I2C_S_IICIF_MASK;
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if(sendStop)
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{
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I2C0->C1 &= ~(I2C_C1_MST_MASK | I2C_C1_TX_MASK);
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while(I2C0->S & I2C_S_BUSY_MASK) ;
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}
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}
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void i2c0_read(uint8_t addr, void* buf, size_t len)
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{
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/* In case a stop was not sent, send a repeated start instead of a start. */
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if(I2C0->C1 & I2C_C1_MST_MASK)
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{
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I2C0->C1 |= I2C_C1_RSTA_MASK
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| I2C_C1_TX_MASK;
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}
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else
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{
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I2C0->C1 |= I2C_C1_TX_MASK
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| I2C_C1_MST_MASK;
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}
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I2C0->D = addr | 0x01;
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while((I2C0->S & I2C_S_IICIF_MASK) == 0) ; /* Wait end of address transfer */
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I2C0->S |= I2C_S_IICIF_MASK; /* Clear IICIF flag */
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I2C0->C1 &= ~I2C_C1_TX_MASK; /* Configure peripheral for data reception */
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(void) I2C0->D; /* Flush RX with a dummy read, also clears TCF */
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for(size_t i = 0; i < len - 1; i++)
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{
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while((I2C0->S & I2C_S_IICIF_MASK) == 0) ;
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I2C0->S |= I2C_S_IICIF_MASK;
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((char *) buf)[i] = I2C0->D;
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}
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/* Send NACK on last byte read */
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I2C0->C1 |= I2C_C1_TXAK_MASK;
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while((I2C0->S & I2C_S_IICIF_MASK) == 0) ;
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I2C0->S |= I2C_S_IICIF_MASK;
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/* All bytes received, send stop */
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I2C0->C1 &= ~(I2C_C1_MST_MASK | I2C_C1_TXAK_MASK);
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/* Read last byte */
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((char *) buf)[len - 1] = I2C0->D;
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/* Wait until stop has been sent */
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while(I2C0->S & I2C_S_BUSY_MASK) ;
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}
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bool i2c0_busy()
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{
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return (I2C0->S & I2C_S_BUSY_MASK);
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}
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@ -0,0 +1,65 @@
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/***************************************************************************
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* Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#ifndef I2C0_H
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#define I2C0_H
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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/**
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* Initialise I2C peripheral with a bus clock frequency of ~100kHz.
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* NOTE: this driver does not configure the I2C GPIOs, which have to be put in
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* alternate open drain mode by application code.
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*/
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void i2c0_init();
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/**
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* Shut down I2C peripheral.
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* NOTE: is left to application code to change the operating mode of the I2C
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* GPIOs
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*/
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void i2c0_terminate();
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/**
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* Write data to an I2C peripheral.
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* @param addr: address of target peripheral.
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* @param buf: pointer to buffer containing data to be sent.
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* @param len: number of bytes to be sent.
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* @param sendStop: set to true to generate a stop condition on transfer end.
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*/
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void i2c0_write(uint8_t addr, void *buf, size_t len, bool sendStop);
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/**
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* Read data from an I2C peripheral.
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* @param addr: address of target peripheral.
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* @param buf: pointer to a buffer in which received data are written.
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* @param len: number of bytes to be transferred.
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*/
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void i2c0_read(uint8_t addr, void *buf, size_t len);
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/**
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* Check if I2C bus is already in use.
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* @return true if bus is busy.
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*/
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bool i2c0_busy();
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#endif /* I2C0_H */
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