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29 * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
33 * \brief Driver for the LM3S I2C (implementation)
37 #include "cfg/cfg_i2c.h"
39 #define LOG_LEVEL I2C_LOG_LEVEL
40 #define LOG_FORMAT I2C_LOG_FORMAT
44 #include <cfg/debug.h>
45 #include <cfg/macros.h> // BV()
46 #include <cfg/module.h>
48 #include <cpu/detect.h>
50 #include <drv/timer.h>
55 * Send START condition on the bus.
57 * \return true on success, false otherwise.
59 static bool i2c_builtin_start(void)
67 * Send START condition and select slave for write.
68 * \c id is the device id comprehensive of address left shifted by 1.
69 * The LSB of \c id is ignored and reset to 0 for write operation.
71 * \return true on success, false otherwise.
73 bool i2c_builtin_start_w(uint8_t id)
76 * Loop on the select write sequence: when the eeprom is busy
77 * writing previously sent data it will reply to the SLA_W
78 * control byte with a NACK. In this case, we must
79 * keep trying until the eeprom responds with an ACK.
81 ticks_t start = timer_clock();
82 while (i2c_builtin_start())
84 else if (timer_clock() - start > ms_to_ticks(CONFIG_I2C_START_TIMEOUT))
86 LOG_ERR("Timeout on TWI_MT_START\n");
96 * Send START condition and select slave for read.
97 * \c id is the device id comprehensive of address left shifted by 1.
98 * The LSB of \c id is ignored and set to 1 for read operation.
100 * \return true on success, false otherwise.
102 bool i2c_builtin_start_r(uint8_t id)
104 if (i2c_builtin_start())
114 * Send STOP condition.
116 void i2c_builtin_stop(void)
123 * Put a single byte in master transmitter mode
124 * to the selected slave device through the TWI bus.
126 * \return true on success, false on error.
128 bool i2c_builtin_put(const uint8_t data)
134 * Get 1 byte from slave in master transmitter mode
135 * to the selected slave device through the I2C bus.
136 * If \a ack is true issue a ACK after getting the byte,
137 * otherwise a NACK is issued.
139 * \return the byte read if ok, EOF on errors.
141 int i2c_builtin_get(bool ack)
153 /* avoid sign extension */
160 * Initialize I2C module.
162 void i2c_builtin_init(void)