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Change read_bit() to return 0 or -1UL, rather than 0 or 1.

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This commit is contained in:
Michael Brown 2006-06-12 19:29:50 +00:00
parent 2e49441535
commit 51a36f1cfb
3 changed files with 7 additions and 3 deletions
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6
src/drivers/bitbash/bitbash.c
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@ -48,8 +48,10 @@ void write_bit ( struct bit_basher *basher, unsigned int bit_id,
* @v bit_id Bit number
* @ret data Value read
*
* @c data will always be either 0 or 1.
* @c data will always be either 0 or -1UL. The idea is that the
* caller can simply binary-AND the returned value with whatever mask
* it needs to apply.
*/
int read_bit ( struct bit_basher *basher, unsigned int bit_id ) {
return ( basher->read ( basher, bit_id ) ? 1 : 0 );
return ( basher->read ( basher, bit_id ) ? -1UL : 0 );
}

2
src/drivers/bitbash/i2c_bit.c
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@ -153,7 +153,7 @@ static uint8_t i2c_recv_byte ( struct bit_basher *basher ) {
/* Receive byte */
for ( i = 8 ; i ; i-- ) {
value <<= 1;
value |= i2c_recv_bit ( basher );
value |= ( i2c_recv_bit ( basher ) & 0x1 );
}
/* Send NACK */

2
src/include/gpxe/i2c.h
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@ -82,7 +82,9 @@ struct i2c_bit_basher {
/** Bit indices used for I2C bit-bashing interface */
enum {
/** Serial clock */
I2C_BIT_SCL = 0,
/** Serial data */
I2C_BIT_SDA,
};