FreeCalypso > hg > freecalypso-tools

annotate target-utils/loadagent/binflash.c @ 957:e030327b6a9a

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CHANGES: document -Petmoff addition
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 08 Jun 2023 00:40:12 +0000
parents b34384991094
children
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b34384991094 loadagent: implemented binary flash programming
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1 /*
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2 * Here we are going to implement our new binary protocol
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3 * for flash programming.
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4 */
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5
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6 #include "types.h"
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7
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8 void
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9 binary_flash_prog_main(program_func)
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10 int (*program_func)();
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11 {
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12 u8 buf[2048] __attribute__ ((aligned (2)));
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13 u32 flash_offset;
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14 unsigned nbytes, p;
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15 int c;
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16
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17 for (;;) {
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18 do
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19 c = serial_in_poll();
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20 while (c < 0);
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21 if (c == 0x04)
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22 return;
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23 if (c != 0x01) {
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24 serial_out(0x15); /* NAK */
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25 printf("ERROR: invalid command opcode\n");
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26 return;
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27 }
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28 /* receive header */
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29 for (p = 0; p < 6; p++) {
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30 c = serial_in_timeout(1000000); /* 0.6 s */
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31 if (c < 0) {
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32 intermediate_timeout: serial_out(0x15); /* NAK */
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33 printf("ERROR: timeout receiving command\n");
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34 return;
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35 }
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36 buf[p] = c;
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37 }
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38 flash_offset = ((u32) buf[0] << 24) |
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39 ((u32) buf[1] << 16) |
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40 ((u32) buf[2] << 8) |
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41 (u32) buf[3];
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42 if (flash_offset & 1) {
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43 serial_out(0x15); /* NAK */
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44 printf("ERROR: odd flash offset\n");
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45 return;
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46 }
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47 nbytes = ((u32) buf[4] << 8) | (u32) buf[5];
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48 if (nbytes & 1) {
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49 serial_out(0x15); /* NAK */
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50 printf("ERROR: odd byte count\n");
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51 return;
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52 }
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53 if (nbytes > sizeof buf) {
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54 serial_out(0x15); /* NAK */
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55 printf("ERROR: byte count exceeds buffer\n");
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56 return;
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57 }
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58 /* receive data */
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59 for (p = 0; p < nbytes; p++) {
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60 c = serial_in_timeout(1000000); /* 0.6 s */
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61 if (c < 0)
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62 goto intermediate_timeout;
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63 buf[p] = c;
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64 }
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65 c = program_func(flash_offset, nbytes >> 1, buf);
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66 if (c < 0)
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67 return;
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68 serial_out(0x06); /* ACK */
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69 }
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70 }