kopia lustrzana https://github.com/bristol-seds/pico-tracker
Added i2c bit-banging. Broken, I can't be bothered to fix without a signal analyser
Richard Meadows
rodzic
9ee4f34a35
commit
c7b1c5278c
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@ -0,0 +1,34 @@
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/*
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* i2c bit-bang
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* Copyright (C) 2015 Richard Meadows <richardeoin>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included 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,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef I2C_BB_H
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#define I2C_BB_H
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#include "samd20.h"
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void i2c_bb_read(uint8_t address, uint8_t* data, uint8_t data_length);
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void i2c_bb_write(uint8_t address, uint8_t* data, uint8_t data_length);
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void i2c_bb_init(void);
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#endif /* I2C_BB_H */
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@ -0,0 +1,42 @@
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/*
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* MS5607
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* Copyright (C) 2015 Richard Meadows <richardeoin>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included 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,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef MS5607_H
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#define MS5607_H
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#include "samd20.h"
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/**
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* Barometer data structure
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*/
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struct barometer {
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double temperature;
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double pressure;
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int valid; // 1 = valid, 0 = invalid
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};
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struct barometer* get_barometer(void);
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void ms5607_init(void);
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#endif /* MS5607_H */
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@ -0,0 +1,198 @@
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/*
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* i2c bit-bang
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* Copyright (C) 2015 Richard Meadows <richardeoin>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included 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,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "samd20.h"
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#include "hw_config.h"
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#include "system/port.h"
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#define SDA I2C_SERCOM_SDA_PIN
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#define SCL I2C_SERCOM_SCL_PIN
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/**
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* Helper functions for pin access
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*/
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static inline void i2c_bb_claim_pin(uint32_t pin, uint8_t value)
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{
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port_pin_set_config(pin,
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SYSTEM_PINMUX_PIN_DIR_OUTPUT_WITH_READBACK, /* Direction */
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SYSTEM_PINMUX_PIN_PULL_NONE, /* Pull */
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false); /* Powersave */
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port_pin_set_output_level(pin, value);
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}
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static inline void i2c_bb_release_pin(uint32_t pin)
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{
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port_pin_set_config(pin,
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SYSTEM_PINMUX_PIN_DIR_INPUT, /* Direction */
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SYSTEM_PINMUX_PIN_PULL_NONE, /* Pull */
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false); /* Powersave */
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}
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#define i2c_bb_write_pin port_pin_set_output_level
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#define i2c_bb_read_pin port_pin_get_input_level
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/**
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* i2c start
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*/
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void i2c_bb_start(void)
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{
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i2c_bb_claim_pin(SDA, 1); /* force pins high */
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i2c_bb_claim_pin(SCL, 1);
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i2c_bb_write_pin(SDA, 0); /* set SDA low */
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i2c_bb_write_pin(SCL, 0); /* then SCL */
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i2c_bb_write_pin(SDA, 1); /* return SDA high */
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}
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/**
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* i2c stop
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*/
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void i2c_bb_stop(void)
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{
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i2c_bb_write_pin(SCL, 0); /* set both lines low */
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i2c_bb_write_pin(SDA, 0);
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i2c_bb_release_pin(SCL); /* release SCL */
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i2c_bb_release_pin(SDA); /* then SDA */
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}
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/**
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* writes a single i2c byte
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*/
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void i2c_bb_put_byte(uint8_t b)
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{
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uint8_t bit;
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for (uint8_t i = 0; i < 8; i++) {
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bit = (b & 0x80) ? 1:0; /* get msb */
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b = b << 1;
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if (i == 0) {
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i2c_bb_claim_pin(SDA, bit);
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} else {
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i2c_bb_write_pin(SDA, bit);
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}
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i2c_bb_write_pin(SCL, 1); /* clock out */
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if ((i == 7) && bit) { i2c_bb_release_pin(SDA); } /* release early if high */
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i2c_bb_write_pin(SCL, 0);
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}
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i2c_bb_release_pin(SDA); /* release SDA pin */
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}
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uint8_t i2c_bb_get_byte(void)
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{
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uint8_t bit, b = 0;
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i2c_bb_release_pin(SDA); /* release SDA */
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for (uint8_t i = 0; i < 8; i++) {
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i2c_bb_write_pin(SCL, 1); /* clock in */
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bit = i2c_bb_read_pin(SDA);
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i2c_bb_write_pin(SCL, 0);
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b |= (bit?1:0); /* write msb first */
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b = b << 1;
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}
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return b;
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}
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/**
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* Issues i2c acknoledge
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*/
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void i2c_bb_ack(void)
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{
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i2c_bb_claim_pin(SDA, 0);
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i2c_bb_write_pin(SCL, 1); /* clock out */
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i2c_bb_write_pin(SCL, 0);
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i2c_bb_write_pin(SDA, 1);
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}
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/**
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* Waits to receive a slave ack. SDA is already released
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*/
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void i2c_bb_get_ack(void)
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{
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i2c_bb_write_pin(SCL, 1);
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// while (i2c_bb_read_pin(SDA)); /* wait for SDA=0 */
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i2c_bb_write_pin(SCL, 0);
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}
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/**
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* I2C Read.
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*
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* address is the full read address like 0xEF
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*/
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void i2c_bb_read(uint8_t address, uint8_t* data, uint8_t data_length)
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{
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address |= 1; /* set read flag */
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i2c_bb_start(); /* start. claim both */
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i2c_bb_put_byte(address); /* address. claim and relase SDA */
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i2c_bb_get_ack(); /* slave acks */
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for (uint8_t n = 0; n < data_length; n++) {
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data[n] = i2c_bb_get_byte(); /* read byte. release SDA */
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if (n+1 < data_length) { /* if not last byte */
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i2c_bb_ack(); /* ack. claim SDA */
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}
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}
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i2c_bb_stop(); /* stop. release both */
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}
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/**
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* I2C Write.
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*
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* address is the full write address like 0xEE
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*/
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void i2c_bb_write(uint8_t address, uint8_t* data, uint8_t data_length)
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{
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address &= ~1; /* clear read flag */
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i2c_bb_start(); /* start. claim both */
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i2c_bb_put_byte(address); /* address. claim and release SDA */
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i2c_bb_get_ack(); /* slave acks */
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for (uint8_t n = 0; n < data_length; n++) {
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i2c_bb_put_byte(data[n]); /* data. claim and release SDA */
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i2c_bb_get_ack(); /* slave acks */
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}
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i2c_bb_claim_pin(SDA, 0); /* claim SDA again */
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i2c_bb_stop(); /* stop */
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}
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void i2c_bb_init(void)
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{
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i2c_bb_claim_pin(SDA, 1);
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i2c_bb_claim_pin(SCL, 0);
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i2c_bb_stop(); /* stop. release both */
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}
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@ -28,7 +28,7 @@
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#include "system/port.h"
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#include "system/events.h"
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#include "system/extint.h"
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#include "sercom/i2c.h"
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#include "i2c_bb.h"
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#include "gps.h"
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#include "si_trx.h"
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#include "watchdog.h"
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@ -119,7 +119,8 @@ void init(enum init_type init_t)
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*/
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/* i2c */
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i2c_init(I2C_SERCOM, I2C_SERCOM_SDA_PINMUX, I2C_SERCOM_SCL_PINMUX);
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//i2c_init(I2C_SERCOM, I2C_SERCOM_SDA_PINMUX, I2C_SERCOM_SCL_PINMUX);
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i2c_bb_init();
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kick_the_watchdog();
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@ -31,7 +31,8 @@
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#if BAROMETER_TYPE_MS5607
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#include "barometer.h"
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#include "sercom/i2c.h"
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//#include "sercom/i2c.h"
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#include "i2c_bb.h"
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#define MS5607_ADDRESS 0xEE
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@ -100,7 +101,7 @@ void command(uint8_t command) {
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buffer[0] = command;
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/* Write command */
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i2c_master_write(MS5607_ADDRESS, buffer, 1);
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i2c_bb_write(MS5607_ADDRESS, buffer, 1);
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}
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/**
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* Reads an 8-bit value
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@ -110,10 +111,10 @@ uint8_t read_8(uint8_t command) {
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buffer[0] = command;
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/* Write command */
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i2c_master_write(MS5607_ADDRESS, buffer, 1);
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i2c_bb_write(MS5607_ADDRESS, buffer, 1);
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/* Read it */
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i2c_master_read(MS5607_ADDRESS, buffer, 1);
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i2c_bb_read(MS5607_ADDRESS, buffer, 1);
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return buffer[0];
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}
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@ -125,10 +126,10 @@ uint16_t read_16(uint8_t command) {
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buffer[0] = command;
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/* Write command */
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i2c_master_write(MS5607_ADDRESS, buffer, 1);
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i2c_bb_write(MS5607_ADDRESS, buffer, 1);
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/* Read it */
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i2c_master_read(MS5607_ADDRESS, buffer, 2);
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i2c_bb_read(MS5607_ADDRESS, buffer, 2);
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return (buffer[0] << 8) | buffer[1];
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}
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@ -140,10 +141,10 @@ uint32_t read_24(uint8_t command) {
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buffer[0] = command;
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/* Write command */
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i2c_master_write(MS5607_ADDRESS, buffer, 1);
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i2c_bb_write(MS5607_ADDRESS, buffer, 1);
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/* Read it */
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i2c_master_read(MS5607_ADDRESS, buffer, 3);
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i2c_bb_read(MS5607_ADDRESS, buffer, 3);
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return (buffer[0] << 16) | (buffer[1] << 8) | buffer[2];
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}
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@ -298,7 +299,7 @@ struct barometer* get_barometer(void)
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}
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/**
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* Assume twi_master_init has already been called
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* Assume i2c_bb_init has already been called
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*/
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void barometer_init(void)
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{
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