AM335x(TQ335x)学习笔记——USB驱动移植

对于AM335x来讲，TI维护的USB驱动已经非常完善了，本文称之为移植，实际上仅仅是配置内核选项使能USB HOST/OTG功能。废话少说，直接动手开启AM335x的USB驱动配置项。

Step1. 配置内核支持USB

默认的配置项没有配置USB相关的选项，但是DTS已经配置好了，我们不需要对DTS作任何修改，详细的内核配置项如下：

 

1. Device Drivers --->

2. [*] USB support --->

3. [*] OTG support

4. <*> EHCI HCD (USB 2.0) support

5. [*] Improved Transaction Translator scheduling (NEW)

6. <*> EHCI support for OMAP3 and later chips (NEW)

7. <*> OHCI HCD (USB 1.1) support

8. <*> OHCI support for OMAP3 and later chips (NEW)

9. <*> Inventra Highspeed Dual Role Controller (TI, ADI, ...)

10. MUSB Mode Selection (Dual Role mode) --->

11. <*> Platform Glue Layer (TI DSPS platforms) --->

12. MUSB DMA mode (Disable DMA (always use PIO)) --->

Step2. 编译内核

 

编译内核的指令如下：

 

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- -j8

Step3.测试

 

用新编译好的内核启动开发板，可以看到如下Log：

 

1. Starting kernel ...

2.  
3.  

4. [    0.000000] Booting Linux on physical CPU 0x0

5. [    0.000000] Linux version 3.17.2 (lilianrong@smarter) (gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-12ubuntu1) ) #96 SMP Fri Dec 26 22:28:21 CST 2014

6. [    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d

7. [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache

8. [    0.000000] Machine model: TI AM335x EVM

9. [    0.000000] cma: Reserved 16 MiB at 9e800000

10. [    0.000000] Memory policy: Data cache writeback

11. [    0.000000]   HighMem zone: 1048574 pages exceeds freesize 0

12. [    0.000000] CPU: All CPU(s) started in SVC mode.

13. [    0.000000] AM335X ES2.1 (sgx neon )

14. [    0.000000] PERCPU: Embedded 9 pages/cpu @dfa99000 s14336 r8192 d14336 u36864

15. [    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 129792

16. [    0.000000] Kernel command line: console=ttyO0,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait

17. [    0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)

18. [    0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)

19. [    0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)

20. [    0.000000] Memory: 483980K/523264K available (6184K kernel code, 668K rwdata, 2468K rodata, 410K init, 8215K bss, 39284K reserved, 0K highmem)

21. [    0.000000] Virtual kernel memory layout:

22. [    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)

23. [    0.000000]     fixmap  : 0xffc00000 - 0xffe00000   (2048 kB)

24. [    0.000000]     vmalloc : 0xe0800000 - 0xff000000   ( 488 MB)

25. [    0.000000]     lowmem  : 0xc0000000 - 0xe0000000   ( 512 MB)

26. [    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)

27. [    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)

28. [    0.000000]       .text : 0xc0008000 - 0xc087b564   (8654 kB)

29. [    0.000000]       .init : 0xc087c000 - 0xc08e2800   ( 410 kB)

30. [    0.000000]       .data : 0xc08e4000 - 0xc098b330   ( 669 kB)

31. [    0.000000]        .bss : 0xc098b330 - 0xc1190f60   (8216 kB)

32. [    0.000000] Hierarchical RCU implementation.

33. [    0.000000]  RCU restricting CPUs from NR_CPUS=2 to nr_cpu_ids=1.

34. [    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1

35. [    0.000000] NR_IRQS:16 nr_irqs:16 16

36. [    0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts

37. [    0.000000] Total of 128 interrupts on 1 active controller

38. [    0.000000] OMAP clockevent source: timer2 at 24000000 Hz

39. [    0.000014] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956969942ns

40. [    0.000064] OMAP clocksource: timer1 at 24000000 Hz

41. [    0.000795] Console: colour dummy device 80x30

42. [    0.000845] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar

43. [    0.000853] ... MAX_LOCKDEP_SUBCLASSES:  8

44. [    0.000861] ... MAX_LOCK_DEPTH:          48

45. [    0.000869] ... MAX_LOCKDEP_KEYS:        8191

46. [    0.000876] ... CLASSHASH_SIZE:          4096

47. [    0.000884] ... MAX_LOCKDEP_ENTRIES:     32768

48. [    0.000890] ... MAX_LOCKDEP_CHAINS:      65536

49. [    0.000898] ... CHAINHASH_SIZE:          32768

50. [    0.000905]  memory used by lock dependency info: 5167 kB

51. [    0.000913]  per task-struct memory footprint: 1152 bytes

52. [    0.000956] Calibrating delay loop... 996.14 BogoMIPS (lpj=4980736)

53. [    0.079037] pid_max: default: 32768 minimum: 301

54. [    0.079443] Security Framework initialized

55. [    0.079567] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)

56. [    0.079580] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)

57. [    0.081764] CPU: Testing write buffer coherency: ok

58. [    0.082949] CPU0: thread -1, cpu 0, socket -1, mpidr 0

59. [    0.083077] Setting up static identity map for 0x805dbb70 - 0x805dbbe0

60. [    0.086307] Brought up 1 CPUs

61. [    0.086326] SMP: Total of 1 processors activated.

62. [    0.086336] CPU: All CPU(s) started in SVC mode.

63. [    0.088948] devtmpfs: initialized

64. [    0.097822] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3

65. [    0.133146] omap_hwmod: tptc0 using broken dt data from edma

66. [    0.133495] omap_hwmod: tptc1 using broken dt data from edma

67. [    0.133823] omap_hwmod: tptc2 using broken dt data from edma

68. [    0.141643] omap_hwmod: debugss: _wait_target_disable failed

69. [    0.199665] pinctrl core: initialized pinctrl subsystem

70. [    0.202194] regulator-dummy: no parameters

71. [    0.232293] NET: Registered protocol family 16

72. [    0.240857] DMA: preallocated 256 KiB pool for atomic coherent allocations

73. [    0.243121] cpuidle: using governor ladder

74. [    0.243149] cpuidle: using governor menu

75. [    0.255109] OMAP GPIO hardware version 0.1

76. [    0.270370] omap-gpmc 50000000.gpmc: could not find pctldev for node /pinmux@44e10800/nandflash_pins_s0, deferring probe

77. [    0.270413] platform 50000000.gpmc: Driver omap-gpmc requests probe deferral

78. [    0.274914] hw-breakpoint: debug architecture 0x4 unsupported.

79. [    0.320324] edma-dma-engine edma-dma-engine.0: TI EDMA DMA engine driver

80. [    0.321686] vbat: 5000 mV 

81. [    0.322450] lis3_reg: no parameters

82. [    0.325863] SCSI subsystem initialized

83. [    0.326622] usbcore: registered new interface driver usbfs

84. [    0.326782] usbcore: registered new interface driver hub

85. [    0.330704] usbcore: registered new device driver usb

86. [    0.331558] omap_i2c 44e0b000.i2c: could not find pctldev for node /pinmux@44e10800/pinmux_i2c0_pins, deferring probe

87. [    0.331597] platform 44e0b000.i2c: Driver omap_i2c requests probe deferral

88. [    0.331654] omap_i2c 4802a000.i2c: could not find pctldev for node /pinmux@44e10800/pinmux_i2c1_pins, deferring probe

89. [    0.331677] platform 4802a000.i2c: Driver omap_i2c requests probe deferral

90. [    0.332863] Advanced Linux Sound Architecture Driver Initialized.

91. [    0.336272] Switched to clocksource timer1

92. [    0.489380] NET: Registered protocol family 2

93. [    0.491239] TCP established hash table entries: 4096 (order: 2, 16384 bytes)

94. [    0.491422] TCP bind hash table entries: 4096 (order: 5, 147456 bytes)

95. [    0.492785] TCP: Hash tables configured (established 4096 bind 4096)

96. [    0.492955] TCP: reno registered

97. [    0.492981] UDP hash table entries: 256 (order: 2, 20480 bytes)

98. [    0.493170] UDP-Lite hash table entries: 256 (order: 2, 20480 bytes)

99. [    0.494207] NET: Registered protocol family 1

100. [    0.496281] RPC: Registered named UNIX socket transport module.

101. [    0.496304] RPC: Registered udp transport module.

102. [    0.496314] RPC: Registered tcp transport module.

103. [    0.496323] RPC: Registered tcp NFSv4.1 backchannel transport module.

104. [    0.498147] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available

105. [    0.502301] futex hash table entries: 256 (order: 2, 16384 bytes)

106. [    0.507875] VFS: Disk quotas dquot_6.5.2

107. [    0.508024] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)

108. [    0.510137] NFS: Registering the id_resolver key type

109. [    0.510482] Key type id_resolver registered

110. [    0.510497] Key type id_legacy registered

111. [    0.510654] jffs2: version 2.2. (NAND) (SUMMARY)  漏 2001-2006 Red Hat, Inc.

112. [    0.511074] msgmni has been set to 977

113. [    0.516250] io scheduler noop registered

114. [    0.516287] io scheduler deadline registered

115. [    0.516358] io scheduler cfq registered (default)

116. [    0.518591] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568

117. [    0.523698] backlight supply power not found, using dummy regulator

118. [    0.527040] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled

119. [    0.533191] omap_uart 44e09000.serial: no wakeirq for uart0

120. [    0.533803] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88, base_baud = 3000000) is a OMAP UART0

121. [    1.234091] console [ttyO0] enabled

122. [    1.243201] omap_rng 48310000.rng: OMAP Random Number Generator ver. 20

123. [    1.250887] [drm] Initialized drm 1.1.0 20060810

124. [    1.264563] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).

125. [    1.271671] [drm] No driver support for vblank timestamp query.

126. [    1.331494] Console: switching to colour frame buffer device 100x30

127. [    1.342552] tilcdc 4830e000.lcdc: fb0:  frame buffer device

128. [    1.348442] tilcdc 4830e000.lcdc: registered panic notifier

129. [    1.354341] [drm] Initialized tilcdc 1.0.0 20121205 on minor 0

130. [    1.390556] brd: module loaded

131. [    1.408704] loop: module loaded

132. [    1.414966] mtdoops: mtd device (mtddev=name/number) must be supplied

133. [    1.425658] usbcore: registered new interface driver asix

134. [    1.431555] usbcore: registered new interface driver ax88179_178a

135. [    1.438078] usbcore: registered new interface driver cdc_ether

136. [    1.444343] usbcore: registered new interface driver smsc95xx

137. [    1.450493] usbcore: registered new interface driver net1080

138. [    1.456543] usbcore: registered new interface driver cdc_subset

139. [    1.462850] usbcore: registered new interface driver zaurus

140. [    1.468911] usbcore: registered new interface driver cdc_ncm

141. [    1.475931] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver

142. [    1.482939] ehci-omap: OMAP-EHCI Host Controller driver

143. [    1.488833] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver

144. [    1.495347] ohci-omap3: OHCI OMAP3 driver

145. [    1.500021] usbcore: registered new interface driver cdc_wdm

146. [    1.506178] usbcore: registered new interface driver usb-storage

147. [    1.512631] usbcore: registered new interface driver usbtest

148. [    1.521522] 47401300.usb-phy supply vcc not found, using dummy regulator

149. [    1.533165] musb-hdrc musb-hdrc.0.auto: MUSB HDRC host driver

150. [    1.543455] musb-hdrc musb-hdrc.0.auto: new USB bus registered, assigned bus number 1

151. [    1.562104] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002

152. [    1.569359] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1

153. [    1.576955] usb usb1: Product: MUSB HDRC host driver

154. [    1.582140] usb usb1: Manufacturer: Linux 3.17.2 musb-hcd

155. [    1.587820] usb usb1: SerialNumber: musb-hdrc.0.auto

156. [    1.599603] hub 1-0:1.0: USB hub found

157. [    1.605078] hub 1-0:1.0: 1 port detected

158. [    1.622178] 47401b00.usb-phy supply vcc not found, using dummy regulator

159. [    1.632793] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver

160. [    1.640700] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 2

161. [    1.651379] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002

162. [    1.658617] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1

163. [    1.666213] usb usb2: Product: MUSB HDRC host driver

164. [    1.671397] usb usb2: Manufacturer: Linux 3.17.2 musb-hcd

165. [    1.677083] usb usb2: SerialNumber: musb-hdrc.1.auto

166. [    1.686595] hub 2-0:1.0: USB hub found

167. [    1.690986] hub 2-0:1.0: 1 port detected

168. [    1.701609] mousedev: PS/2 mouse device common for all mice

169. [    1.711782] omap_rtc 44e3e000.rtc: rtc core: registered 44e3e000.rtc as rtc0

170. [    1.720055] i2c /dev entries driver

171. [    1.723788] Driver for 1-wire Dallas network protocol.

172. [    1.736318] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec

173. [    1.755078] omap_hsmmc 48060000.mmc: unable to get vmmc regulator -517

174. [    1.762557] platform 48060000.mmc: Driver omap_hsmmc requests probe deferral

175. [    1.772215] ledtrig-cpu: registered to indicate activity on CPUs

176. [    1.779192] usbcore: registered new interface driver usbhid

177. [    1.785014] usbhid: USB HID core driver

178. [    1.795167] davinci_evm sound: ASoC: CODEC (null) not registered

179. [    1.801977] davinci_evm sound: snd_soc_register_card failed (-517)

180. [    1.808594] platform sound: Driver davinci_evm requests probe deferral

181. [    1.816440] oprofile: using arm/armv7

182. [    1.821115] TCP: cubic registered

183. [    1.824592] Initializing XFRM netlink socket

184. [    1.829340] NET: Registered protocol family 17

185. [    1.834075] NET: Registered protocol family 15

186. [    1.839198] Key type dns_resolver registered

187. [    1.843920] omap_voltage_late_init: Voltage driver support not added

188. [    1.850660] sr_dev_init: No voltage domain specified for smartreflex0. Cannot initialize

189. [    1.859152] sr_dev_init: No voltage domain specified for smartreflex1. Cannot initialize

190. [    1.868786] ThumbEE CPU extension supported.

191. [    1.873392] Registering SWP/SWPB emulation handler

192. [    1.878502] SmartReflex Class3 initialized

193. [    1.891065] omap-gpmc 50000000.gpmc: GPMC revision 6.0

194. [    1.898216] nand: device found, Manufacturer ID: 0xec, Chip ID: 0xd3

195. [    1.904865] nand: Samsung NAND 1GiB 3,3V 8-bit

196. [    1.909588] nand: 1024MiB, SLC, page size: 2048, OOB size: 64

197. [    1.915591] nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme

198. [    1.921433] 10 ofpart partitions found on MTD device omap2-nand.0

199. [    1.927825] Creating 10 MTD partitions on "omap2-nand.0":

200. [    1.933473] 0x000000000000-0x000000020000 : "NAND.SPL"

201. [    1.947581] 0x000000020000-0x000000040000 : "NAND.SPL.backup1"

202. [    1.958288] 0x000000040000-0x000000060000 : "NAND.SPL.backup2"

203. [    1.967696] 0x000000060000-0x000000080000 : "NAND.SPL.backup3"

204. [    1.978978] 0x000000080000-0x0000000c0000 : "NAND.u-boot-spl"

205. [    1.989074] 0x0000000c0000-0x0000001c0000 : "NAND.u-boot"

206. [    2.000439] 0x0000001c0000-0x0000001e0000 : "NAND.u-boot-env"

207. [    2.010926] 0x0000001e0000-0x000000200000 : "NAND.u-boot-env.backup1"

208. [    2.022841] 0x000000200000-0x000000a00000 : "NAND.kernel"

209. [    2.038984] 0x000000a00000-0x000010000000 : "NAND.file-system"

210. [    2.332279] tps65910 0-002d: No interrupt support, no core IRQ

211. [    2.349898] vrtc: 1800 mV 

212. [    2.353264] vrtc: supplied by vbat

213. [    2.360422] vio: at 1500 mV 

214. [    2.363696] vio: supplied by vbat

215. [    2.370657] vdd_mpu: 912 <--> 1312 mV at 1325 mV 

216. [    2.375794] vdd_mpu: supplied by vbat

217. [    2.384999] vdd_core: 912 <--> 1150 mV at 1137 mV 

218. [    2.390404] vdd_core: supplied by vbat

219. [    2.397288] vdd3: 5000 mV 

220. [    2.402667] vdig1: at 1800 mV 

221. [    2.406225] vdig1: supplied by vbat

222. [    2.412538] vdig2: at 1800 mV 

223. [    2.415945] vdig2: supplied by vbat

224. [    2.422351] vpll: at 1800 mV 

225. [    2.425662] vpll: supplied by vbat

226. [    2.432822] vdac: at 1800 mV 

227. [    2.436335] vdac: supplied by vbat

228. [    2.443361] vaux1: at 1800 mV 

229. [    2.446899] vaux1: supplied by vbat

230. [    2.453342] vaux2: at 3300 mV 

231. [    2.456846] vaux2: supplied by vbat

232. [    2.463190] vaux33: at 3300 mV 

233. [    2.466775] vaux33: supplied by vbat

234. [    2.473172] vmmc: 1800 <--> 3300 mV at 3300 mV 

235. [    2.478237] vmmc: supplied by vbat

236. [    2.484283] vbb: at 3000 mV 

237. [    2.487872] vbb: supplied by vbat

238. [    2.495458] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz

239. [    2.503173] usb 2-1: new high-speed USB device number 2 using musb-hdrc

240. [    2.517638] omap_i2c 4802a000.i2c: bus 1 rev0.11 at 100 kHz

241. [    2.568304] wm8960 0-001a: No platform data supplied

242. [    2.644805] mmc0: host does not support reading read-only switch. assuming write-enable.

243. [    2.654108] usb 2-1: New USB device found, idVendor=1a40, idProduct=0101

244. [    2.661182] usb 2-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0

245. [    2.668663] usb 2-1: Product: USB 2.0 Hub

246. [    2.675544] hub 2-1:1.0: USB hub found

247. [    2.681178] hub 2-1:1.0: 4 ports detected

248. [    2.690227] mmc0: new high speed SDHC card at address aaaa

249. [    2.699372] mmcblk0: mmc0:aaaa SL16G 14.8 GiB 

250. [    2.710574]  mmcblk0: p1 p2

251. [    2.723345] davinci_evm sound: wm8960-hifi <-> 4803c000.mcasp mapping ok

252. [    2.806163] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6

253. [    2.812552] davinci_mdio 4a101000.mdio: detected phy mask ffffffde

254. [    2.825370] libphy: 4a101000.mdio: probed

255. [    2.829704] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver unknown

256. [    2.838093] davinci_mdio 4a101000.mdio: phy[5]: device 4a101000.mdio:05, driver unknown

257. [    2.847649] cpsw 4a100000.ethernet: Detected MACID = c4:ed:ba:88:b5:e4

258. [    2.859600] input: gpio_keyad@0 as /devices/gpio_keyad@0/input/input0

259. [    2.869505] omap_rtc 44e3e000.rtc: setting system clock to 2000-01-01 00:00:00 UTC (946684800)

260. [    2.878657] sr_init: No PMIC hook to init smartreflex

261. [    2.884274] sr_init: platform driver register failed for SR

262. [    2.907467] lis3_reg: disabling

263. [    2.910975] ALSA device list:

264. [    2.914075]   #0: AM335x-EVM

265. [    3.008783] kjournald starting.  Commit interval 5 seconds

266. [    3.017395] EXT3-fs (mmcblk0p2): using internal journal

267. [    3.025475] EXT3-fs (mmcblk0p2): recovery complete

268. [    3.030554] EXT3-fs (mmcblk0p2): mounted filesystem with ordered data mode

269. [    3.037888] VFS: Mounted root (ext3 filesystem) on device 179:2.

270. [    3.047778] devtmpfs: mounted

271. [    3.051614] Freeing unused kernel memory: 408K (c087c000 - c08e2000)

272. ----------mount all..........

273. ----------Starting mdev......

274.  
275.  

276. Please press Enter to activate this console. 

277. @tq335x #[   11.296192] usb 2-1.2: new high-speed USB device number 3 using musb-hdrc

278. [   11.419745] usb 2-1.2: device v0951 p1665 is not supported

279. [   11.425483] usb 2-1.2: New USB device found, idVendor=0951, idProduct=1665

280. [   11.432693] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3

281. [   11.440342] usb 2-1.2: Product: DataTraveler 2.0

282. [   11.445163] usb 2-1.2: Manufacturer: Kingston

283. [   11.449729] usb 2-1.2: SerialNumber: 50E549C20268FE41491C17E1

284. [   11.458198] usb-storage 2-1.2:1.0: USB Mass Storage device detected

285. [   11.476650] scsi host0: usb-storage 2-1.2:1.0

286. [   12.768968] scsi 0:0:0:0: Direct-Access     Kingston DataTraveler 2.0 1.00 PQ: 0 ANSI: 4

287. [   12.785085] sd 0:0:0:0: [sda] 30233588 512-byte logical blocks: (15.4 GB/14.4 GiB)

288. [   12.806457] sd 0:0:0:0: [sda] Write Protect is off

289. [   12.817312] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA

290. [   12.840718]  sda: sda4

291. [   12.850713] sd 0:0:0:0: [sda] Attached SCSI removable disk

292. [   13.265222] usb 2-1.2: USB disconnect, device number 3

末尾是拔插U盘的效果。

 

Step4. 配置其它USB设备驱动

如果需要配置其它USB设备驱动可以继续在menuconfig配置列表中进行配置，这里就不一一介绍了。

 

注：

不知道是我的开发板硬件问题还是其它问题，我自己移植的Linux-3.17.2只有中间的一个USB端口可用，另外两个USB端口没有任何作用。使用官方提供的内核镜像也存在这样的问题，下周一跟天嵌售后确认下此问题。如果看到本文的朋友手头上也有TQ3358开发板，请帮忙测试下，多谢。

本文作者：girlkoo

本文链接：http://blog.csdn.net/girlkoo/article/details/42178103