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i2c.c
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i2c.c
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#include <stdint.h>
#include <p89v51rd2.h>
#include "i2c.h"
#ifdef UNIT_TEST
#error "This file should not be included in Unit tests"
#endif
void
i2cInit(void)
{
SDA = 1;
SCL = 1;
}
void
eepromWriteBytes(uint16_t addr, uint8_t *val, uint8_t n_bytes)
{
uint8_t ui2, ui3;
DISABLE_ALL_INTERRUPTS;
for (; n_bytes>0; n_bytes--, val++, addr++) {
I2C_START_BIT;
I2C_SEND_BYTE(EEPROM_CTRL_WRITE);
I2C_GET_ACK(CY);
#if EP24C > 2
ui2 = addr>>8;
I2C_SEND_BYTE(ui2);
I2C_GET_ACK(CY);
#endif
ui2 = (uint8_t)addr;
I2C_SEND_BYTE(ui2);
I2C_GET_ACK(CY);
I2C_SEND_BYTE(val[0]);
I2C_GET_ACK(CY);
I2C_STOP_BIT;
delayms(10);
}
ENABLE_ALL_INTERRUPTS;
}
void
eepromReadBytes(uint16_t addr, uint8_t *val, uint8_t n_bytes)
{
uint8_t ui2, ui3;
DISABLE_ALL_INTERRUPTS;
for (; n_bytes>0; n_bytes--, val++, addr++) {
I2C_START_BIT;
I2C_SEND_BYTE(EEPROM_CTRL_WRITE);
I2C_GET_ACK(CY);
#if EP24C > 2
ui2 = addr>>8;
I2C_SEND_BYTE(ui2);
I2C_GET_ACK(CY);
#endif
ui2 = (uint8_t)addr;
I2C_SEND_BYTE(ui2);
I2C_GET_ACK(CY);
I2C_START_BIT;
I2C_SEND_BYTE(EEPROM_CTRL_READ);
I2C_GET_ACK(CY);
I2C_GET_BYTE(ui2);
I2C_SEND_ACK(1);
val[0] = ui2;
I2C_STOP_BIT;
}
ENABLE_ALL_INTERRUPTS;
}
void
ds1307Write(uint8_t addr, uint8_t data)
{
uint8_t ui3;
I2C_START_BIT;
do {
I2C_SEND_BYTE(TIMER_CTRL_WRITE);
I2C_GET_ACK(CY);
} while (NACK == CY);
do {
I2C_SEND_BYTE(addr);
I2C_GET_ACK(CY);
} while (NACK == CY);
do {
I2C_SEND_BYTE(data);
I2C_GET_ACK(CY);
} while (NACK == CY);
CY=0;
I2C_STOP_BIT;
}
uint8_t
ds1307Read(uint8_t addr)
{
uint8_t ui3, data;
I2C_START_BIT;
do {
I2C_SEND_BYTE(TIMER_CTRL_WRITE);
I2C_GET_ACK(CY);
} while (NACK == CY);
do {
I2C_SEND_BYTE(addr);
I2C_GET_ACK(CY);
} while (NACK == CY);
I2C_START_BIT;
do {
I2C_SEND_BYTE(TIMER_CTRL_READ);
I2C_GET_ACK(CY);
} while (NACK == CY);
I2C_GET_BYTE(data);
I2C_SEND_ACK(1);
CY=0;
I2C_STOP_BIT;
return(data);
}