5.3.10 Step 10: Raw Storage Write – SFLASH

Programming the patches to the SFLASH is applied in chunks. The chunk size is 4096 bytes but the maximal size that can be programmed is 4080 bytes. Thus, the buffer is programmed in actual chunks of 4080 bytes. The procedure for programming the SFLASH follows:

1. The main processor sends the Raw Storage Write command in chunks of 4080 bytes. The user must provide the storage ID for the SFLASH, offset in bytes, and number of bytes to program. The content must reside in the 8 bytes offset of block 33, which makes the total offset equal to 33 × 4096 + 8 = 135176 bytes.
2. The CC3120 or CC3220 device responds with an Ack.
3. The main processor sends the Get Status command.
4. The CC3120 or CC3220 device responds with an Ack followed by the Last Status response. Only the fourth byte should be inspected; 0x40 means success whereas other values indicate error.
5. The main processor sends an Ack response.
6. Steps 1 to 5 repeat if the data is larger than chunk size.

Figure 13 shows the SFLASH programming procedure in a zoomed-out pane. As observed, the procedure is divided into three separate programming instances.

Figure 14 shows the SFLASH programming procedure in a zoomed-in pane to the first chunk. As observed, the chunk is 4080 bytes in offset (33 × 4096 + 8 = 135176 bytes).