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Tidied up i2c stuff

master
Richard Meadows 2015-10-09 18:28:44 +01:00
rodzic 77a5804ce4
commit 9ac99dc637
2 zmienionych plików z 108 dodań i 64 usunięć
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67
firmware/inc/sercom/i2c.h
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@ -27,84 +27,23 @@
#include "sercom/i2c_master.h"
/**
* We just declare our single instance here because. Very naughty
*/
struct i2c_master_module i2c_master_instance;
/**
* I2C Write.
*
* address is the full write address like 0xEE
*/
static void i2c_master_write(uint8_t address, uint8_t* data, uint16_t data_length)
{
uint32_t timeout = 0;
struct i2c_master_packet packet = {
.address = address >> 1,
.data_length = data_length,
.data = data,
.ten_bit_address = false,
.high_speed = false,
.hs_master_code = 0x0,
};
while (i2c_master_write_packet_wait(&i2c_master_instance, &packet) !=
STATUS_OK) {
/* Increment timeout counter and check if timed out. */
if (timeout++ > 1000) {
break;
}
}
}
void i2c_master_write(uint8_t address, uint8_t* data, uint16_t data_length);
/**
* I2C Read.
*
* address is the full write address like 0xEE
*/
static void i2c_master_read(uint8_t address, uint8_t* data, uint16_t data_length)
{
uint32_t timeout = 0;
struct i2c_master_packet packet = {
.address = address >> 1,
.data_length = data_length,
.data = data,
.ten_bit_address = false,
.high_speed = false,
.hs_master_code = 0x0,
};
while (i2c_master_read_packet_wait(&i2c_master_instance, &packet) !=
STATUS_OK) {
/* Increment timeout counter and check if timed out. */
if (timeout++ > 1000) {
break;
}
}
}
void i2c_master_read(uint8_t address, uint8_t* data, uint16_t data_length);
/**
* I2C bus master.
*/
static void i2c_init(SercomI2cm* sercom, uint32_t pad0_pinmux, uint32_t pad1_pinmux)
{
struct i2c_master_config config_i2c_master;
i2c_master_get_config_defaults(&config_i2c_master);
/* Config */
config_i2c_master.buffer_timeout = 10000;
config_i2c_master.baud_rate = 100; /* 100 kBaud */
/* Pinmux */
config_i2c_master.pinmux_pad0 = pad0_pinmux;
config_i2c_master.pinmux_pad1 = pad1_pinmux;
/* Initialize and enable device with config. */
i2c_master_init(&i2c_master_instance, sercom, &config_i2c_master);
i2c_master_enable(&i2c_master_instance);
}
void i2c_init(SercomI2cm*const sercom, uint32_t pad0_pinmux, uint32_t pad1_pinmux);
#endif /* I2C_H */

105
firmware/src/sercom/i2c.c 100644
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@ -0,0 +1,105 @@
/*
* A wrapper around the samd20 i2c functions. Single master only
* Copyright (C) 2015 Richard Meadows <richardeoin>
*
* 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.
*/
#include "sercom/i2c_master.h"
/**
* We just declare our single instance here because. Very naughty
*/
struct i2c_master_module i2c_master_instance;
/**
* I2C Write.
*
* address is the full write address like 0xEE
*/
void i2c_master_write(uint8_t address, uint8_t* data, uint16_t data_length)
{
uint32_t timeout = 0;
struct i2c_master_packet packet = {
.address = address >> 1,
.data_length = data_length,
.data = data,
.ten_bit_address = false,
.high_speed = false,
.hs_master_code = 0x0,
};
while (i2c_master_write_packet_wait(&i2c_master_instance, &packet) !=
STATUS_OK) {
/* Increment timeout counter and check if timed out. */
if (timeout++ > 1000) {
break;
}
}
}
/**
* I2C Read.
*
* address is the full write address like 0xEE
*/
void i2c_master_read(uint8_t address, uint8_t* data, uint16_t data_length)
{
uint32_t timeout = 0;
struct i2c_master_packet packet = {
.address = address >> 1,
.data_length = data_length,
.data = data,
.ten_bit_address = false,
.high_speed = false,
.hs_master_code = 0x0,
};
while (i2c_master_read_packet_wait(&i2c_master_instance, &packet) !=
STATUS_OK) {
/* Increment timeout counter and check if timed out. */
if (timeout++ > 1000) {
break;
}
}
}
/**
* I2C bus master.
*/
void i2c_init(SercomI2cm*const sercom, uint32_t pad0_pinmux, uint32_t pad1_pinmux)
{
struct i2c_master_config config_i2c_master;
i2c_master_get_config_defaults(&config_i2c_master);
/* Config */
config_i2c_master.buffer_timeout = 10000;
config_i2c_master.baud_rate = 100; /* 100 kBaud */
/* Pinmux */
config_i2c_master.pinmux_pad0 = pad0_pinmux;
config_i2c_master.pinmux_pad1 = pad1_pinmux;
/* Initialize and enable device with config. */
i2c_master_init(&i2c_master_instance, (Sercom*)sercom, &config_i2c_master);
i2c_master_enable(&i2c_master_instance);
}