diff options
Diffstat (limited to 'firmware/src/pcd/rc632_highlevel.c')
| -rw-r--r-- | firmware/src/pcd/rc632_highlevel.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/firmware/src/pcd/rc632_highlevel.c b/firmware/src/pcd/rc632_highlevel.c index b83f52b..14a2a2a 100644 --- a/firmware/src/pcd/rc632_highlevel.c +++ b/firmware/src/pcd/rc632_highlevel.c @@ -94,6 +94,57 @@ rc632_power_down(struct rfid_asic_handle *handle) RC632_CONTROL_POWERDOWN); } +#define MAX_WRITE_LEN 16 /* see Sec. 18.6.1.2 of RC632 Spec Rev. 3.2. */ + +int +rc632_write_eeprom(struct rfid_asic_handle *handle, + u_int16_t addr, u_int8_t len, u_int8_t *data) +{ + u_int8_t sndbuf[MAX_WRITE_LEN + 2]; + u_int8_t reg; + int ret; + + if (len > MAX_WRITE_LEN) + return -EINVAL; + if (addr < 0x10) + return -EPERM; + if (addr > 0x1ff) + return -EINVAL; + + sndbuf[0] = addr & 0x00ff; /* LSB */ + sndbuf[1] = addr >> 8; /* MSB */ + memcpy(&sndbuf[2], data, len); + + ret = opcd_rc632_fifo_write(handle, len + 2, sndbuf, 0x03); + if (ret < 0) + return ret; + + ret = opcd_rc632_reg_write(handle, RC632_REG_COMMAND, RC632_CMD_WRITE_E2); + if (ret < 0) + return ret; + + ret = opcd_rc632_reg_read(handle, RC632_REG_ERROR_FLAG, ®); + if (ret < 0) + return ret; + + if (reg & RC632_ERR_FLAG_ACCESS_ERR) + return -EPERM; + + while (1) { + ret = opcd_rc632_reg_read(handle, RC632_REG_SECONDARY_STATUS, ®); + if (ret < 0) + return ret; + + if (reg & RC632_SEC_ST_E2_READY) { + /* the E2Write command must be terminated, See sec. 18.6.1.3 */ + ret = opcd_rc632_reg_write(handle, RC632_REG_COMMAND, RC632_CMD_IDLE); + break; + } + } + + return ret; +} + int rc632_read_eeprom(struct rfid_asic_handle *handle, u_int16_t addr, u_int8_t len, u_int8_t *recvbuf) |