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i2cslave: basic working implimentation

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Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Brendan Le Foll
2014-04-22 15:30:34 +01:00
parent 44b43c5063
commit ac131e1e17
1 changed files with 5 additions and 4 deletions
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9
src/i2c/i2cslave.cxx
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@@ -28,9 +28,9 @@ using namespace maa;
I2CSlave::I2CSlave(unsigned int sda, unsigned int scl) I2CSlave::I2CSlave(unsigned int sda, unsigned int scl)
{ {
// Galileo only has one I2CSlave device which is always /dev/i2c-0 // Galileo only has one I2C master which should be /dev/i2c-0
// reliability is a fickle friend! // reliability is a fickle friend!
if (i2c_handle = open("/dev/i2c-0", O_RDWR) < 1) { if ((i2c_handle = open("/dev/i2c-0", O_RDWR)) < 1) {
fprintf(stderr, "Failed to open requested i2c port"); fprintf(stderr, "Failed to open requested i2c port");
} }
} }
@@ -50,7 +50,8 @@ I2CSlave::receive(void)
int int
I2CSlave::read(char *data, int length) I2CSlave::read(char *data, int length)
{ {
if (this->read(data, length) == length) { // this is the read(3) syscall not I2CSlave::read()
if (::read(i2c_handle, data, length) == length) {
return length; return length;
} }
return -1; return -1;
@@ -69,7 +70,7 @@ I2CSlave::read(void)
int int
I2CSlave::write(const char *data, int length) I2CSlave::write(const char *data, int length)
{ {
if (i2c_smbus_write_i2c_block_data(i2c_handle, data[0], length, (uint8_t*) data) < 0) { if (i2c_smbus_write_i2c_block_data(i2c_handle, data[0], length-1, (uint8_t*) data+1) < 0) {
fprintf(stderr, "Failed to write to I2CSlave slave\n"); fprintf(stderr, "Failed to write to I2CSlave slave\n");
return -1; return -1;
} }