设置发射功率
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设置发射功率：
CC2530 设置RF的发送功率寄存器为TXPOWER，全局搜索一下可以看到以下代码
1.#define MAC_RADIO_SET_PAN_COORDINATOR(b) st( FRMFILT0 = (FRMFIL
T0 & ~PAN_COORDINATOR) | (PAN_COORDINATOR * (b!=0)); )
2.#define MAC_RADIO_SET_CHANNEL(x) st( FREQCTRL = FREQ_24
05MHZ + 5 * ((x) - 11); )
3.#define MAC_RADIO_SET_TX_POWER(x) st( TXPOWER = x; )
nt>
4.
5.#define MAC_RADIO_SET_PAN_ID(x) st( PAN_ID0 = (x) & 0x
FF; PAN_ID1 = (x) >> 8; )
6.#define MAC_RADIO_SET_SHORT_ADDR(x) st( SHORT_ADDR0 = (x)
& 0xFF; SHORT_ADDR1 = (x) >> 8; )
继续跟踪MAC_RADIO_SET_TX_POWER
/********************************************************************************** ****************
1.* @fn macRadioUpdateTxPower
2.*
3.* @brief Update the radio's transmit power if a new power level has be
en requested
4.*
5.* @param reqTxPower - file scope variable that holds the last request
power level
6.* macPhyTxPower - global variable that holds radio's set power
level
7.*
8.* @return none
9.****************************************************************************
**********************
10.*/
11.MAC_INTERNAL_API void macRadioUpdateTxPower(void)
12.{
13. halIntState_t s;
14.
15./*
16. * If the requested power setting is different from the actual radio sett
ing,
17. * attempt to udpate to the new power setting.
18. */
19. HAL_ENTER_CRITICAL_SECTION(s);
20.if (reqTxPower != macPhyTxPower)
21. {
22./*
23. * Radio power cannot be updated when the radio is physically transmitt
ing.
24. * If there is a possibility radio is transmitting, do not change the p
ower
25. * setting. This function will be called again after the current trans
mit
26. * completes.
27. */
28.if (!macRxOutgoingAckFlag && !MAC_TX_IS_PHYSICALLY_ACTIVE())
29. {
30./*
31. * Set new power level; update the shadow value and write
32. * the new value to the radio hardware.
33. */
34. macPhyTxPower = reqTxPower;
35. MAC_RADIO_SET_TX_POWER(macPhyTxPower);
36. }
37. }
38. HAL_EXIT_CRITICAL_SECTION(s);
39.}
在这里我们可以看到TXPOWER的设置值实际上应该是reqTxOower，让我看一下reqTxOower在哪里设置吧，继续跟踪可以发现reqTxPower在函数MAC_INTERNAL_API uint8 macRadioSetTxPower(uint8 txPower)中得到更新，一路跟踪下去可以在函数uint8 MAC_MlmeSetReq(uint8 pibAttribute, void *pValue)看到以下代码
case MAC_PHY_TRANSMIT_POWER:
1./* Legacy transmit power attribute */
2.#if !defined HAL_MAC_USE_REGISTER_POWER_VALUES && \
3. !defined HAL_PA_LNA && !defined HAL_PA_LNA_CC2590
4./* Legacy transmit power attribute value for CC2530 alone,
5. * or runtime selection support build means a negative absolute value.
6. * However, when used as register power values or
7. * with HAL_PA_LNAxxx definition (without runtime selection)
8. * the attribute value is not a negative absolute value. */
9. macPib.phyTransmitPower = (uint8)(-(int8)macPib.phyTransmitPower);
10.#endif /* !defined HAL_MAC_USE_REGISTER_POWER_VALUES && ... */
11./* pass through to next case -- do not break*/
12.
13.#endif /* MAC_OBSOLETE_PHY_TRANSMIT_POWER */