diff options
Diffstat (limited to 'cpu/at91rm9200/i2c.c')
| -rw-r--r-- | cpu/at91rm9200/i2c.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/cpu/at91rm9200/i2c.c b/cpu/at91rm9200/i2c.c index d5d6268d..515792c 100644 --- a/cpu/at91rm9200/i2c.c +++ b/cpu/at91rm9200/i2c.c @@ -60,7 +60,6 @@ at91_xfer(unsigned char chip, unsigned int addr, int alen, AT91PS_TWI twi = (AT91PS_TWI) AT91_TWI_BASE; int length; unsigned char *buf; - /* Set the TWI Master Mode Register */ twi->TWI_MMR = (chip << 16) | (alen << 8) | ((rw == 1) ? AT91C_TWI_MREAD : 0); @@ -126,13 +125,15 @@ int i2c_read(unsigned char chip, unsigned int addr, int alen, unsigned char *buffer, int len) { +#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW /* we only allow one address byte */ if (alen > 1) return 1; -#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW /* XXX assume an ATMEL AT24C16 */ if (alen == 1) { +#if 0 /* EEPROM code already sets this correctly */ chip |= (addr >> 8) & 0xff; +#endif addr = addr & 0xff; } #endif @@ -146,22 +147,25 @@ i2c_write(unsigned char chip, unsigned int addr, int alen, int i; unsigned char *buf; +#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW /* we only allow one address byte */ if (alen > 1) return 1; -#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW /* XXX assume an ATMEL AT24C16 */ if (alen == 1) { buf = buffer; /* do single byte writes */ for (i = 0; i < len; i++) { +#if 0 /* EEPROM code already sets this correctly */ chip |= (addr >> 8) & 0xff; +#endif addr = addr & 0xff; if (at91_xfer(chip, addr, alen, buf++, 1, 0)) return 1; + addr++; } + return 0; } - return 0; #endif return at91_xfer(chip, addr, alen, buffer, len, 0); } |