FreeCalypso > hg > freecalypso-tools

annotate target-utils/libcommon/cmd_baud_switch.c @ 1012:11391cb6bdc0

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patch from fixeria: doc change from SE K2x0 to K2xx Since their discovery in late 2022, Sony Ericsson K200 and K220 phones were collectively referred to as SE K2x0 in FreeCalypso documentation. However, now that SE K205 has been discovered as yet another member of the same family (same PCBA in different case), it makes more sense to refer to the whole family as SE K2xx.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 23 Sep 2024 12:23:20 +0000
parents 2b041d57de1f
children
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1 /*
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2 * Baud rate switching command
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3 */
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4
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5 #include <stdlib.h>
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6 #include "types.h"
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7 #include "ns16550.h"
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8
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9 extern struct ns16550_regs *uart_base;
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10 extern int serial_in_poll();
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11
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12 static const struct tab {
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13 int baud;
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14 int divisor;
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15 } rate_table[] = {
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16 /*
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17 * First support the rates and divisors implemented by the
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18 * Calypso boot ROM. Dividing 13 MHz by 7 gives an approximation
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19 * of 115200 (x16); the divisors used by the boot ROM code for
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20 * the slower baud rates are all 7x the usual PC value.
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21 */
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22 {115200, 7},
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23 {57600, 7 * 2},
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24 {38400, 7 * 3},
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25 {28800, 7 * 4},
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26 {19200, 7 * 6},
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27 /*
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28 * Going faster than ~115200 baud means using a divisor
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29 * less than 7, resulting in a non-standard baud rate.
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30 * The /1, /2 and /4 seem like reasonable choices.
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31 */
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32 {812500, 1},
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33 {406250, 2},
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34 {203125, 4},
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35 /* that's all we really need to support */
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36 {0, 0}
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37 };
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38
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39 /*
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40 * The following helper function actually switches the UART
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41 * baud rate divisor. Call serial_flush() first. It returns the
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42 * old divisor value.
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43 *
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44 * Note the u8 type for both the new and old divisor values.
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45 * All supported divisors are well below 255, so we don't bother
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46 * with the upper byte.
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47 */
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48 static u8
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49 actually_switch_baud(newdiv)
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50 u8 newdiv;
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51 {
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52 volatile struct ns16550_regs *regs;
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53 u8 save_lcr, save_old_baud;
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54
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55 regs = uart_base;
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56 save_lcr = regs->lcr;
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57 regs->lcr = save_lcr | NS16550_LCR_DLAB;
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58 save_old_baud = regs->datareg;
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59 regs->datareg = newdiv;
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60 regs->lcr = save_lcr;
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61 return(save_old_baud);
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62 }
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63
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64 void
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65 cmd_baud_switch(argbulk)
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66 char *argbulk;
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67 {
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68 char *argv[2];
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69 int baudarg;
108
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70 const struct tab *tp;
0
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71 u8 save_old_baud;
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72 int c;
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73
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74 if (parse_args(argbulk, 1, 1, argv, 0) < 0)
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75 return;
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76 baudarg = atoi(argv[0]);
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77 for (tp = rate_table; tp->baud; tp++)
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78 if (tp->baud == baudarg)
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79 break;
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80 if (!tp->baud) {
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81 printf("ERROR: invalid/unimplemented baud rate argument\n");
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82 return;
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83 }
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84
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85 /* do it */
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86 serial_flush();
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87 save_old_baud = actually_switch_baud(tp->divisor);
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88
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89 /*
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90 * After getting the echo of this command at the old baud rate
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91 * (see the serial flush call just before switching the divisor),
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92 * the line will go silent from the user's perspective.
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93 * The user should wait just a little bit, then send us a 0x55 ('U')
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94 * at the new baud rate - we should be in the below loop waiting
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95 * for this character by then. Receiving that character
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96 * correctly (0x55 was chosen for the bit pattern - unlikely to
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97 * be received if the sender is sending at a wrong baud rate)
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98 * will cause us to conclude this command and return a new '='
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99 * prompt at the new baud rate.
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100 *
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101 * If we get something else, we assume that someone messed up,
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102 * switch back to the old baud rate, scribble an error message
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103 * and return.
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104 */
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105 do
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106 c = serial_in_poll();
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107 while (c < 0);
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108 if (c != 0x55) {
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109 actually_switch_baud(save_old_baud);
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110 printf("ERROR: no \'U\' received, switched back to old baud rate\n");
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111 }
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112 }