*
* \brief Driver for the AVR ATMega TWI (implementation)
*
- * \version $Id$
- *
* \author Stefano Fedrigo <aleph@develer.com>
* \author Bernie Innocenti <bernie@codewiz.org>
*/
-#include "hw/hw_cpu.h" /* CLOCK_FREQ */
+#include <hw/hw_cpufreq.h> /* CPU_FREQ */
#include "cfg/cfg_i2c.h"
+
+#define LOG_LEVEL I2C_LOG_LEVEL
+#define LOG_FORMAT I2C_LOG_FORMAT
+
+#include <cfg/log.h>
+
#include <cfg/debug.h>
#include <cfg/macros.h> // BV()
#include <cfg/module.h>
*
* \return true on success, false otherwise.
*/
-static bool i2c_start(void)
+static bool i2c_builtin_start(void)
{
TWCR = BV(TWINT) | BV(TWSTA) | BV(TWEN);
WAIT_TWI_READY;
if (TW_STATUS == TW_START || TW_STATUS == TW_REP_START)
return true;
- kprintf("!TW_(REP)START: %x\n", TWSR);
+ LOG_ERR("!TW_(REP)START: %x\n", TWSR);
return false;
}
*
* \return true on success, false otherwise.
*/
-bool i2c_start_w(uint8_t id)
+bool i2c_builtin_start_w(uint8_t id)
{
/*
* Loop on the select write sequence: when the eeprom is busy
* keep trying until the eeprom responds with an ACK.
*/
ticks_t start = timer_clock();
- while (i2c_start())
+ while (i2c_builtin_start())
{
- TWDR = id & ~READ_BIT;
+ TWDR = id & ~I2C_READBIT;
TWCR = BV(TWINT) | BV(TWEN);
WAIT_TWI_READY;
return true;
else if (TW_STATUS != TW_MT_SLA_NACK)
{
- kprintf("!TW_MT_SLA_(N)ACK: %x\n", TWSR);
+ LOG_ERR("!TW_MT_SLA_(N)ACK: %x\n", TWSR);
break;
}
else if (timer_clock() - start > ms_to_ticks(CONFIG_I2C_START_TIMEOUT))
{
- kprintf("Timeout on TWI_MT_START\n");
+ LOG_ERR("Timeout on TWI_MT_START\n");
break;
}
}
*
* \return true on success, false otherwise.
*/
-bool i2c_start_r(uint8_t id)
+bool i2c_builtin_start_r(uint8_t id)
{
- if (i2c_start())
+ if (i2c_builtin_start())
{
- TWDR = id | READ_BIT;
+ TWDR = id | I2C_READBIT;
TWCR = BV(TWINT) | BV(TWEN);
WAIT_TWI_READY;
if (TW_STATUS == TW_MR_SLA_ACK)
return true;
- kprintf("!TW_MR_SLA_ACK: %x\n", TWSR);
+ LOG_ERR("!TW_MR_SLA_ACK: %x\n", TWSR);
}
return false;
/**
* Send STOP condition.
*/
-void i2c_stop(void)
+void i2c_builtin_stop(void)
{
TWCR = BV(TWINT) | BV(TWEN) | BV(TWSTO);
}
*
* \return true on success, false on error.
*/
-bool i2c_put(const uint8_t data)
+bool i2c_builtin_put(const uint8_t data)
{
TWDR = data;
TWCR = BV(TWINT) | BV(TWEN);
WAIT_TWI_READY;
if (TW_STATUS != TW_MT_DATA_ACK)
{
- kprintf("!TW_MT_DATA_ACK: %x\n", TWSR);
+ LOG_ERR("!TW_MT_DATA_ACK: %x\n", TWSR);
return false;
}
return true;
*
* \return the byte read if ok, EOF on errors.
*/
-int i2c_get(bool ack)
+int i2c_builtin_get(bool ack)
{
TWCR = BV(TWINT) | BV(TWEN) | (ack ? BV(TWEA) : 0);
WAIT_TWI_READY;
{
if (TW_STATUS != TW_MR_DATA_ACK)
{
- kprintf("!TW_MR_DATA_ACK: %x\n", TWSR);
+ LOG_ERR("!TW_MR_DATA_ACK: %x\n", TWSR);
return EOF;
}
}
{
if (TW_STATUS != TW_MR_DATA_NACK)
{
- kprintf("!TW_MR_DATA_NACK: %x\n", TWSR);
+ LOG_ERR("!TW_MR_DATA_NACK: %x\n", TWSR);
return EOF;
}
}
/**
* Initialize TWI module.
*/
-void i2c_init(void)
+void i2c_builtin_init(void)
{
ATOMIC(
/*
/*
* Set speed:
- * F = CLOCK_FREQ / (16 + 2*TWBR * 4^TWPS)
+ * F = CPU_FREQ / (16 + 2*TWBR * 4^TWPS)
*/
#ifndef CONFIG_I2C_FREQ
#warning Using default value of 300000L for CONFIG_I2C_FREQ
#endif
#define TWI_PRESC 1 /* 4 ^ TWPS */
- TWBR = (CLOCK_FREQ / (2 * CONFIG_I2C_FREQ * TWI_PRESC)) - (8 / TWI_PRESC);
+ TWBR = (CPU_FREQ / (2 * CONFIG_I2C_FREQ * TWI_PRESC)) - (8 / TWI_PRESC);
TWSR = 0;
TWCR = BV(TWEN);
);