unsigned char _i2c_read(unsigned char device_addr, unsigned char sub_addr, unsigned char *buff, int ByteNo) { unsigned char i; DEBUG_MSG(("<<=====================_i2c_read=======================>>\r\n")); I2C_DELAY_LONG; _i2c_start(); I2C_DELAY; if(_i2c_write_byte(device_addr)) { _i2c_stop(); DEBUG_MSG(("<<=====================Write Error - Addr=======================>>\r\n")); return ERROR_CODE_READ_ADDR; } if(_i2c_write_byte(sub_addr)) { _i2c_stop(); DEBUG_MSG(("<<=====================Write Error - Addr=======================>>\r\n")); return ERROR_CODE_READ_ADDR; } _i2c_start(); I2C_DELAY; if(_i2c_write_byte(device_addr+1)) { _i2c_stop(); DEBUG_MSG(("<<=====================Write Error - Addr=======================>>\r\n")); return ERROR_CODE_READ_ADDR; } for(i = 0; i<ByteNo; i++) buff[i] = _i2c_read_byte(); I2C_DELAY; _i2c_stop(); I2C_DELAY_LONG; return ERROR_CODE_TRUE; }
unsigned char _i2c_write(unsigned char device_addr, unsigned char sub_addr, unsigned char *buff, int ByteNo) { unsigned char i; DEBUG_MSG(("<<=====================_i2c_write=======================>>\r\n")); _i2c_start(); I2C_DELAY; if(_i2c_write_byte(device_addr)) { _i2c_stop(); DEBUG_MSG(("<<=====================Write Error - Addr=======================>>\r\n")); return ERROR_CODE_WRITE_ADDR; } if(_i2c_write_byte(sub_addr)) { _i2c_stop(); DEBUG_MSG(("<<=====================Write Error - Addr=======================>>\r\n")); return ERROR_CODE_WRITE_ADDR; } for(i = 0; i<ByteNo; i++) { if(_i2c_write_byte(buff[i])) { _i2c_stop(); DEBUG_MSG(("<<=====================Write Error - Data=======================>>\r\n")); return ERROR_CODE_WRITE_DATA; } } I2C_DELAY; _i2c_stop(); I2C_DELAY_LONG; return ERROR_CODE_TRUE; }
int i2c_write_regs(i2c_t dev, uint8_t address, uint8_t reg, char *data, int length) { I2C_Type *i2c; int n = 0; switch (dev) { #if I2C_0_EN case I2C_0: i2c = I2C_0_DEV; break; #endif default: return -1; } if (_i2c_start(i2c, address, I2C_FLAG_WRITE)) { _i2c_reset(i2c); return -1; } n = _i2c_transmit(i2c, ®, 1); if (!n) { _i2c_stop(i2c); return n; } n = _i2c_transmit(i2c, (uint8_t *)data, length); _i2c_stop(i2c); return n; }
int i2c_read_bytes(i2c_t dev, uint8_t address, char *data, int length) { I2C_Type *i2c; int n = 0; switch (dev) { #if I2C_0_EN case I2C_0: i2c = I2C_0_DEV; break; #endif default: return -1; } if (_i2c_start(i2c, address, I2C_FLAG_READ)) { _i2c_reset(i2c); return -1; } n = _i2c_receive(i2c, (uint8_t *)data, length); if (n < 0) { _i2c_reset(i2c); return -1; } _i2c_stop(i2c); return n; }
int i2c_write_bytes(i2c_t dev, uint8_t address, const void *data, int length) { I2C_Type *i2c; int n = 0; switch (dev) { #if I2C_0_EN case I2C_0: i2c = I2C_0_DEV; break; #endif default: return -1; } if (_i2c_start(i2c, address, I2C_FLAG_WRITE)) { _i2c_reset(i2c); return -1; } n = _i2c_transmit(i2c, data, length); _i2c_stop(i2c); return n; }
// calls _i2c_start with write=0,1 depending on LSB of i2c_addr mp_obj_t i2c_obj_start(mp_obj_t self_in) { pyb_i2c_obj_t *self = self_in; if (self->i2c_state != I2C_STATE_IDLE) { _i2c_stop(self->i2c_port); self->i2c_state = I2C_STATE_IDLE; } if (_i2c_start(self->i2c_port) == true) return mp_const_true; return mp_const_false; }
int i2c_read_regs(i2c_t dev, uint8_t address, uint8_t reg, void *data, int length) { I2C_Type *i2c; int n = 0; switch (dev) { #if I2C_0_EN case I2C_0: i2c = I2C_0_DEV; break; #endif default: return -1; } if (_i2c_start(i2c, address, I2C_FLAG_WRITE)) { _i2c_reset(i2c); return -1; } /* send reg */ n = _i2c_transmit(i2c, ®, 1); if (!n) { _i2c_stop(i2c); return n; } if (_i2c_restart(i2c, address, I2C_FLAG_READ)) { _i2c_reset(i2c); return -1; } n = _i2c_receive(i2c, (uint8_t *)data, length); if (n < 0) { _i2c_reset(i2c); return -1; } _i2c_stop(i2c); return n; }