Philips LPC2129 - Page 272

Flash Memory System and Programming 272 May 03, 2004
Philips Semiconductors Preliminary User Manual
LPC2119/2129/2194/2292/2294ARM-based Microcontroller
Write to RAM <start address> <number of bytes>
The host should send the data only after receiving the CMD_SUCCESS return code. The host should send the check-sum after
transmitting 20 UU-encoded lines. The checksum is generated by adding raw data (before UU-encoding) bytes and is reset after
transmitting 20 UU-encoded lines. The length of any UU-encoded line should not exceed 61 characters(bytes) i.e. it can hold 45
data bytes. When the data fits in less then 20 UU-encoded lines then the check-sum should be of actual number of bytes sent.
The ISP command handler compares it with the check-sum of the received bytes. If the check-sum matches then the ISP
command handler responds with "OK<CR><LF>" to continue further transmission. If the check-sum does not match then the ISP
command handler responds with "RESEND<CR><LF>". In response the host should retransmit the bytes.
Read Memory <address> <number of bytes>
The data stream is followed by the command success return code. The check-sum is sent after transmitting 20 UU-encoded lines.
The checksum is generated by adding raw data (before UU-encoding) bytes and is reset after transmitting 20 UU-encoded lines.
The length of any UU-encoded line should not exceed 61 characters(bytes) i.e. it can hold 45 data bytes. When the data fits in
less then 20 UU-encoded lines then the check-sum is of actual number of bytes sent. The host should compare it with the check-
sum of the received bytes. If the check-sum matches then the host should respond with "OK<CR><LF>" to continue further
transmission. If the check-sum does not match then the host should respond with "RESEND<CR><LF>". In response the ISP
command handler sends the data again.
Table 203: ISP Write to RAM command description
Command W
Input
Start Address: RAM address where data bytes are to be written. This address should be a word
boundary.
Number of Bytes: Number of bytes to be written. Count should be a multiple of 4.
Return Code
CMD_SUCCESS |
ADDR_ERROR (Address not a word boundary) |
ADDR_NOT_MAPPED |
COUNT_ERROR (Byte count is not multiple of 4) |
PARAM_ERROR
CODE_READ_PROTECTION_ENABLED
Description
This command is used to download data to RAM. The data should be in UU-encoded format. As of
Bootloader rev. 1.61 this command is blocked when code read protection is enabled.
Example "W 1073742336 4<CR><LF>" writes 4 bytes of data to address 0x4000 0200.