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#212 wiringPiI2CReadBlockData and wiringPiI2CWriteBlockData

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This commit is contained in:
mstroh76
2024-04-28 16:33:16 +02:00
parent 199622c930
commit 86f47476b2
2 changed files with 30 additions and 1 deletions
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27
wiringPi/wiringPiI2C.c
View File

@@ -47,7 +47,6 @@
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
@@ -154,6 +153,21 @@ int wiringPiI2CReadReg16 (int fd, int reg)
return data.word & 0xFFFF ;
}
int wiringPiI2CReadBlockData (int fd, int reg, uint8_t size, uint8_t *values)
{
union i2c_smbus_data data;
if (size>I2C_SMBUS_BLOCK_MAX) {
size = I2C_SMBUS_BLOCK_MAX;
}
data.block[0] = size;
int result = i2c_smbus_access (fd, I2C_SMBUS_READ, reg, I2C_SMBUS_I2C_BLOCK_DATA, &data);
if (result<0) {
return result;
}
memcpy(values, &data.block[1], size);
return data.block[0];
}
/*
* wiringPiI2CWrite:
@@ -189,6 +203,17 @@ int wiringPiI2CWriteReg16 (int fd, int reg, int value)
return i2c_smbus_access (fd, I2C_SMBUS_WRITE, reg, I2C_SMBUS_WORD_DATA, &data) ;
}
int wiringPiI2CWriteBlockData (int fd, int reg, uint8_t size, const uint8_t *values)
{
union i2c_smbus_data data;
if (size>I2C_SMBUS_BLOCK_MAX) {
size = I2C_SMBUS_BLOCK_MAX;
}
data.block[0] = size;
memcpy(&data.block[1], values, size);
return i2c_smbus_access (fd, I2C_SMBUS_WRITE, reg, I2C_SMBUS_BLOCK_DATA, &data) ;
}
/*
* wiringPiI2CSetupInterface:

4
wiringPi/wiringPiI2C.h
View File

@@ -22,6 +22,8 @@
***********************************************************************
*/
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
@@ -29,10 +31,12 @@ extern "C" {
extern int wiringPiI2CRead (int fd) ;
extern int wiringPiI2CReadReg8 (int fd, int reg) ;
extern int wiringPiI2CReadReg16 (int fd, int reg) ;
extern int wiringPiI2CReadBlockData (int fd, int reg, uint8_t size, uint8_t *values);
extern int wiringPiI2CWrite (int fd, int data) ;
extern int wiringPiI2CWriteReg8 (int fd, int reg, int data) ;
extern int wiringPiI2CWriteReg16 (int fd, int reg, int data) ;
extern int wiringPiI2CWriteBlockData (int fd, int reg, uint8_t size, const uint8_t *values);
extern int wiringPiI2CSetupInterface (const char *device, int devId) ;
extern int wiringPiI2CSetup (const int devId) ;