FreeCalypso > hg > freecalypso-tools
view target-utils/loadagent/binload.c @ 989:a5bff8104b45
pln-ppb-test: implement program operation
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 03 Dec 2023 00:16:17 +0000 |
parents | 3229940734e5 |
children |
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/* * Here we are going to implement our new binary protocol for RAM loading * for a faster version of fc-xram. */ #include "types.h" void cmd_binary_memload() { int state, recptr, extlen, datalen; u8 record[256], cksum; u32 addr; u16 rec_count; int c, i; rec_count = 0; for (state = 0; ; ) { switch (state) { case 0: c = serial_in_timeout(3000000); /* 1.8 s */ if (c < 0 || c == 0x04) return; if (c == 0x05) { serial_out(0x06); /* ACK */ serial_out(rec_count >> 8); serial_out(rec_count); continue; } if (c >= 6) { record[0] = c; extlen = c + 1; datalen = c - 5; recptr = 1; state = 1; continue; } serial_out(0x15); /* NAK */ state = 2; continue; case 1: c = serial_in_timeout(1000000); /* 0.6 s */ if (c < 0) { serial_out(0x15); /* NAK */ state = 2; continue; } record[recptr++] = c; if (recptr < extlen) continue; /* verify checksum */ cksum = 0; for (i = 0; i < extlen; i++) cksum += record[i]; if (cksum != 0xFF) { serial_out(0x15); /* NAK */ state = 2; continue; } addr = ((u32)record[1] << 24) | ((u32)record[2] << 16) | ((u32)record[3] << 8) | (u32)record[4]; memcpy(addr, record + 5, datalen); rec_count++; state = 0; continue; default: c = serial_in_timeout(10000000); /* 6.15 s */ if (c < 0) return; serial_out_if_empty(0x15); /* NAK */ continue; } } }