mac_backoff_timer.lst
来自「TI的基于ZIGBEE2006的协议栈」· LST 代码 · 共 1,132 行 · 第 1/5 页
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44
45 /* ------------------------------------------------------------------------------------------------
46 * Defines
47 * ------------------------------------------------------------------------------------------------
48 */
49 #define COMPARE_STATE_ROLLOVER_BV BV(0)
50 #define COMPARE_STATE_TRIGGER_BV BV(1)
51 #define COMPARE_STATE_ARM_BV BV(2)
52
53 #define COMPARE_STATE_TRIGGER COMPARE_STATE_TRIGGER_BV
54 #define COMPARE_STATE_ROLLOVER COMPARE_STATE_ROLLOVER_BV
55 #define COMPARE_STATE_ROLLOVER_AND_TRIGGER (COMPARE_STATE_ROLLOVER_BV | COMPARE_STATE_TRIGGER_BV)
56 #define COMPARE_STATE_ROLLOVER_AND_ARM_TRIGGER (COMPARE_STATE_ROLLOVER_BV | COMPARE_STATE_ARM_BV)
57
58
59 /*
60 * The datasheet mentions a small delay on both receive and transmit side of approximately
61 * two microseconds. The precise characterization is given below.
62 * (This data is not given in rev 1.03 datasheet)
63 */
64 #define RX_TX_PROP_DELAY_AVG_USEC ((MAC_RADIO_RX_TX_PROP_DELAY_MIN_USEC + MAC_RADIO_RX_TX_PROP_DELAY_MAX_USEC) / 2)
65 #define RX_TX_PROP_DELAY_AVG_TIMER_TICKS ((uint16)(MAC_RADIO_TIMER_TICKS_PER_USEC() * RX_TX_PROP_DELAY_AVG_USEC + 0.5))
66
67 /*
68 * For slotted receives, the SFD signal is expected to occur on a specifc symbol boundary.
69 * This does *not* correspond to the backoff boundary. The SFD signal occurs at an
70 * offset from the backoff boundary. This is done for efficiency of related algorithms.
71 *
72 * Once transmit is strobed there is a fixed delay until the SFD signal occurs. The frame
73 * does not start over-the-air transmit until after an internal radio delay of 12 symbols.
74 * Once transmitting over-the-air, the preamble is sent (8 symbols) followed by the
75 * SFD field (2 symbols). After the SFD field completes, the SFD signal occurs. This
76 * adds up to a total of 22 symbols from strobe to SFD signal.
77 *
78 * Since 22 symbols spans more than a backoff (20 symbols) the modulus operation is used
79 * to find the symbol offset which is 2 symbols.
80 *
81 * This math is derived formally via the pre-processor.
82 */
83 #define SYMBOLS_FROM_STROBE_TO_PREAMBLE 12 /* from datasheet */
84 #define SYMBOLS_FROM_PREAMBLE_TO_SFD (MAC_SPEC_PREAMBLE_FIELD_LENGTH + MAC_SPEC_SFD_FIELD_LENGTH)
85 #define SYMBOLS_FROM_STROBE_TO_SFD (SYMBOLS_FROM_STROBE_TO_PREAMBLE + SYMBOLS_FROM_PREAMBLE_TO_SFD)
86 #define SYMBOLS_EXPECTED_AT_SFD (SYMBOLS_FROM_STROBE_TO_SFD % MAC_A_UNIT_BACKOFF_PERIOD)
87
88 /* after all that formal math, make sure the result is as expected */
89 #if (SYMBOLS_EXPECTED_AT_SFD != 2)
90 #error "ERROR! Internal problem with pre-processor math of slotted alignment."
91 #endif
92
93
94 /*
95 * The expected SFD signal occurs at the symbol offset *plus* a small internal propagation delay
96 * internal to the radio. This delay is given as the sum of a receive side delay and a transmit
97 * side delay. When this delay is subtracted from the internal timer, the internal time base
98 * actually becomes the actual receive time *minus* the transmit delay. This works out though.
99 * The transmit logic does *not* take into account this delay. Since the timer is skewed by the
100 * transmit delay already, the transmits go out precisely on time.
101 */
102 #define TIMER_TICKS_EXPECTED_AT_SFD ((SYMBOLS_EXPECTED_AT_SFD * MAC_RADIO_TIMER_TICKS_PER_SYMBOL()) \
103 + RX_TX_PROP_DELAY_AVG_TIMER_TICKS)
104
105
106 /* ------------------------------------------------------------------------------------------------
107 * Local Variables
108 * ------------------------------------------------------------------------------------------------
109 */
\ In segment XDATA_Z, align 1, keep-with-next
\ 000000 REQUIRE __INIT_XDATA_Z
110 static uint32 backoffTimerRollover;
\ ??backoffTimerRollover:
\ 000000 DS 4
\ In segment XDATA_Z, align 1, keep-with-next
\ 000000 REQUIRE __INIT_XDATA_Z
111 static uint32 backoffTimerTrigger;
\ ??backoffTimerTrigger:
\ 000000 DS 4
\ In segment XDATA_Z, align 1, keep-with-next
\ 000000 REQUIRE __INIT_XDATA_Z
112 static uint8 compareState;
\ ??compareState:
\ 000000 DS 1
113
114
115 /**************************************************************************************************
116 * @fn macBackoffTimerInit
117 *
118 * @brief Intializes backoff timer.
119 *
120 * @param none
121 *
122 * @return none
123 **************************************************************************************************
124 */
\ In segment BANKED_CODE, align 1, keep-with-next
125 void macBackoffTimerInit(void)
\ macBackoffTimerInit:
126 {
\ 000000 74F4 MOV A,#-0xc
\ 000002 12.... LCALL ?BANKED_ENTER_XDATA
\ 000005 ; Saved register size: 12
\ 000005 ; Auto size: 0
127 compareState = COMPARE_STATE_ROLLOVER;
\ 000005 7401 MOV A,#0x1
\ 000007 90.... MOV DPTR,#??compareState
\ 00000A F0 MOVX @DPTR,A
128 MAC_RADIO_BACKOFF_SET_COUNT(0);
\ 00000B ; Setup parameters for call to function macMcuOverflowSetCount
\ 00000B 90.... MOV DPTR,#__Constant_0
\ 00000E 78.. MOV R0,#?V0 + 0
\ 000010 12.... LCALL ?L_MOV_X
\ 000013 AA.. MOV R2,?V0 + 0
\ 000015 AB.. MOV R3,?V0 + 1
\ 000017 AC.. MOV R4,?V0 + 2
\ 000019 AD.. MOV R5,?V0 + 3
\ 00001B 90.... MOV DPTR,#(macMcuOverflowSetCount & 0xffff)
\ 00001E 74.. MOV A,#((macMcuOverflowSetCount >> 16) & 0xff)
\ 000020 12.... LCALL ?BCALL ; Banked call to: DPTR()
129 macBackoffTimerSetRollover(MAC_BACKOFF_TIMER_DEFAULT_ROLLOVER);
\ 000023 ; Setup parameters for call to function macBackoffTimerSetRollover
\ 000023 90.... MOV DPTR,#__Constant_c0000
\ 000026 78.. MOV R0,#?V0 + 0
\ 000028 12.... LCALL ?L_MOV_X
\ 00002B AA.. MOV R2,?V0 + 0
\ 00002D AB.. MOV R3,?V0 + 1
\ 00002F AC.. MOV R4,?V0 + 2
\ 000031 AD.. MOV R5,?V0 + 3
\ 000033 90.... MOV DPTR,#(macBackoffTimerSetRollover & 0xffff)
\ 000036 74.. MOV A,#((macBackoffTimerSetRollover >> 16) & 0xff)
\ 000038 12.... LCALL ?BCALL ; Banked call to: DPTR()
130 MAC_RADIO_BACKOFF_COMPARE_CLEAR_INTERRUPT();
\ 00003B 75C3C3 MOV 0xc3,#-0x3d
131 MAC_RADIO_BACKOFF_COMPARE_ENABLE_INTERRUPT();
\ 00003E ; Setup parameters for call to function macMcuOrT2PEROF2
\ 00003E 7920 MOV R1,#0x20
\ 000040 90.... MOV DPTR,#(macMcuOrT2PEROF2 & 0xffff)
\ 000043 74.. MOV A,#((macMcuOrT2PEROF2 >> 16) & 0xff)
\ 000045 12.... LCALL ?BCALL ; Banked call to: DPTR()
132 }
\ 000048 02.... LJMP ?Subroutine1 & 0xFFFF
\ In segment BANKED_CODE, align 1, keep-with-next
\ ?Subroutine1:
\ 000000 7F04 MOV R7,#0x4
\ 000002 02.... LJMP ?BANKED_LEAVE_XDATA
133
134
135 /**************************************************************************************************
136 * @fn macBackoffTimerReset
137 *
138 * @brief Resets backoff timer.
139 *
140 * @param none
141 *
142 * @return none
143 **************************************************************************************************
144 */
\ In segment BANKED_CODE, align 1, keep-with-next
145 void macBackoffTimerReset(void)
\ macBackoffTimerReset:
146 {
\ 000000 C082 PUSH DPL
\ 000002 C083 PUSH DPH
\ 000004 ; Saved register size: 2
\ 000004 ; Auto size: 0
147 MAC_RADIO_BACKOFF_COMPARE_DISABLE_INTERRUPT();
\ 000004 ; Setup parameters for call to function macMcuAndT2PEROF2
\ 000004 79DF MOV R1,#-0x21
\ 000006 90.... MOV DPTR,#(macMcuAndT2PEROF2 & 0xffff)
\ 000009 74.. MOV A,#((macMcuAndT2PEROF2 >> 16) & 0xff)
\ 00000B 12.... LCALL ?BCALL ; Banked call to: DPTR()
148 macBackoffTimerInit();
\ 00000E ; Setup parameters for call to function macBackoffTimerInit
\ 00000E 90.... MOV DPTR,#(macBackoffTimerInit & 0xffff)
\ 000011 74.. MOV A,#((macBackoffTimerInit >> 16) & 0xff)
\ 000013 12.... LCALL ?BCALL ; Banked call to: DPTR()
149 }
\ 000016 D083 POP DPH
\ 000018 D082 POP DPL
\ 00001A 02.... LJMP ?BRET
150
151
152 /**************************************************************************************************
153 * @fn macBackoffTimerSetRollover
154 *
155 * @brief Set rollover count of backoff timer.
156 *
157 * @param rolloverBackoff - backoff count where count is reset to zero
158 *
159 * @return none
160 **************************************************************************************************
161 */
\ In segment BANKED_CODE, align 1, keep-with-next
162 void macBackoffTimerSetRollover(uint32 rolloverBackoff)
\ macBackoffTimerSetRollover:
163 {
\ 000000 74F0 MOV A,#-0x10
\ 000002 12.... LCALL ?BANKED_ENTER_XDATA
\ 000005 ; Saved register size: 16
\ 000005 ; Auto size: 0
\ 000005 8A.. MOV ?V0 + 0,R2
\ 000007 8B.. MOV ?V0 + 1,R3
\ 000009 8C.. MOV ?V0 + 2,R4
\ 00000B 8D.. MOV ?V0 + 3,R5
164 halIntState_t s;
165
166 MAC_ASSERT(rolloverBackoff > MAC_RADIO_BACKOFF_COUNT()); /* rollover value must be greater than count */
\ 00000D ; Setup parameters for call to function macMcuOverflowCount
\ 00000D 90.... MOV DPTR,#(macMcuOverflowCount & 0xffff)
\ 000010 74.. MOV A,#((macMcuOverflowCount >> 16) & 0xff)
\ 000012 12.... LCALL ?BCALL ; Banked call to: DPTR()
\ 000015 8A.. MOV ?V0 + 4,R2
\ 000017 8B.. MOV ?V0 + 5,R3
\ 000019 8C.. MOV ?V0 + 6,R4
\ 00001B 8D.. MOV ?V0 + 7,R5
\ 00001D 78.. MOV R0,#?V0 + 0
\ 00001F 79.. MOV R1,#?V0 + 4
\ 000021 12.... LCALL ?UL_GT
\ 000024 4008 JC ??macBackoffTimerSetRollover_0
\ 000026 ; Setup parameters for call to function halAssertHandler
\ 000026 90.... MOV DPTR,#(halAssertHandler & 0xffff)
\ 000029 74.. MOV A,#((halAssertHandler >> 16) & 0xff)
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