* \author Bernie Innocenti <bernie@codewiz.org>
*/
-#include "i2c_avr.h"
-
#include "hw/hw_cpu.h" /* CLOCK_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>
#include <cpu/detect.h>
#include <cpu/irq.h>
#include <drv/timer.h>
+#include <drv/i2c.h>
#include <compat/twi.h>
/* Wait for TWINT flag set: bus is ready */
#define WAIT_TWI_READY do {} while (!(TWCR & BV(TWINT)))
-#define READ_BIT BV(0)
-
-
/**
* Send START condition on the bus.
*
* \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;
}
}
return (int)(uint8_t)TWDR;
}
-
-/**
- * Send a sequence of bytes in master transmitter mode
- * to the selected slave device through the TWI bus.
- *
- * \return true on success, false on error.
- */
-bool i2c_send(const void *_buf, size_t count)
-{
- const uint8_t *buf = (const uint8_t *)_buf;
-
- while (count--)
- {
- if (!i2c_put(*buf++))
- return false;
- }
- return true;
-}
-
-
-/**
- * Receive a sequence of one or more bytes from the
- * selected slave device in master receive mode through
- * the TWI bus.
- *
- * Received data is placed in \c buf.
- *
- * \note a NACK is automatically given on the last received
- * byte.
- *
- * \return true on success, false on error
- */
-bool i2c_recv(void *_buf, size_t count)
-{
- uint8_t *buf = (uint8_t *)_buf;
-
- /*
- * When reading the last byte the TWEA bit is not
- * set, and the eeprom should answer with NACK
- */
- while (count--)
- {
- /*
- * The last byte read does not has an ACK
- * to stop communication.
- */
- int c = i2c_get(count);
-
- if (c == EOF)
- return false;
- else
- *buf++ = c;
- }
-
- return true;
-}
-
-
MOD_DEFINE(i2c);
/**
* Initialize TWI module.
*/
-void i2c_init(void)
+void i2c_builtin_init(void)
{
ATOMIC(
/*
* Set speed:
* F = CLOCK_FREQ / (16 + 2*TWBR * 4^TWPS)
*/
- #ifndef CONFIG_TWI_FREQ
- #warning Using default value of 300000L for CONFIG_TWI_FREQ
- #define CONFIG_TWI_FREQ 300000L /* ~300 kHz */
+ #ifndef CONFIG_I2C_FREQ
+ #warning Using default value of 300000L for CONFIG_I2C_FREQ
+ #define CONFIG_I2C_FREQ 300000L /* ~300 kHz */
#endif
#define TWI_PRESC 1 /* 4 ^ TWPS */
- TWBR = (CLOCK_FREQ / (2 * CONFIG_TWI_FREQ * TWI_PRESC)) - (8 / TWI_PRESC);
+ TWBR = (CLOCK_FREQ / (2 * CONFIG_I2C_FREQ * TWI_PRESC)) - (8 / TWI_PRESC);
TWSR = 0;
TWCR = BV(TWEN);
);
projects / bertos.git / blobdiff