[文章]鸿蒙OS 注册UART驱动接口
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注册UART驱动接口。
HDF框架提供了UART驱动接口的模板方法UartHostMethod，实现UART驱动接口的代码如下：
1. static int32_tSampleInit(struct UartHost *host)
2. {
3. HDF_LOGI("%s: Enter", __func__);
4. if (host == NULL) {
5. HDF_LOGE("%s: invalidparameter", __func__);
6. return HDF_ERR_INVALID_PARAM;
7. }
8. return HDF_SUCCESS;
9. }
10.
11. static int32_t SampleDeinit(struct UartHost*host)
12. {
13. HDF_LOGI("%s: Enter", __func__);
14. if (host == NULL) {
15. HDF_LOGE("%s: invalidparameter", __func__);
16. return HDF_ERR_INVALID_PARAM;
17. }
18. return HDF_SUCCESS;
19. }
20.
21. // 向UART中写入数据
22. static int32_t SampleWrite(struct UartHost*host, uint8_t *data, uint32_t size)
23. {
24. HDF_LOGI("%s: Enter", __func__);
25. uint32_t idx;
26. struct UartRegisterMap *regMap = NULL;
27. struct UartDevice *device = NULL;
28.
29. if (host == NULL || data == NULL || size ==0) {
30. HDF_LOGE("%s: invalidparameter", __func__);
31. return HDF_ERR_INVALID_PARAM;
32. }
33. device = (struct UartDevice *)host->priv;
34. if (device == NULL) {
35. HDF_LOGE("%s: device isNULL", __func__);
36. return HDF_ERR_INVALID_PARAM;
37. }
38. regMap = (struct UartRegisterMap *)device->resource.physBase;
39. for (idx = 0; idx < size; idx++) {
40. while (UartPl011IsBusy(regMap));
41. UartPl011Write(regMap, data[idx]);
42. }
43. return HDF_SUCCESS;
44. }
45.
46. // 设置UART的波特率
47. static int32_t SampleSetBaud(structUartHost *host, uint32_t baudRate)
48. {
49. HDF_LOGI("%s: Enter", __func__);
50. struct UartDevice *device = NULL;
51. struct UartRegisterMap *regMap = NULL;
52. UartPl011Error err;
53.
54. if (host == NULL) {
55. HDF_LOGE("%s: invalidparameter", __func__);
56. return HDF_ERR_INVALID_PARAM;
57. }
58. device = (struct UartDevice *)host->priv;
59. if (device == NULL) {
60. HDF_LOGE("%s: device isNULL", __func__);
61. return HDF_ERR_INVALID_PARAM;
62. }
63. regMap = (struct UartRegisterMap *)device->resource.physBase;
64. if (device->state !=UART_DEVICE_INITIALIZED) {
65. return UART_PL011_ERR_NOT_INIT;
66. }
67. if (baudRate == 0) {
68. return UART_PL011_ERR_INVALID_BAUD;
69. }
70. err = UartPl011SetBaudrate(regMap,device->uartClk, baudRate);
71. if (err == UART_PL011_ERR_NONE) {
72. device->baudrate = baudRate;
73. }
74. return err;
75. }
76.
77. // 获取UART的波特率
78. static int32_t SampleGetBaud(structUartHost *host, uint32_t *baudRate)
79. {
80. HDF_LOGI("%s: Enter", __func__);
81. struct UartDevice *device = NULL;
82.
83. if (host == NULL) {
84. HDF_LOGE("%s: invalidparameter", __func__);
85. return HDF_ERR_INVALID_PARAM;
86. }
87. device = (struct UartDevice *)host->priv;
88. if (device == NULL) {
89. HDF_LOGE("%s: device isNULL", __func__);
90. return HDF_ERR_INVALID_PARAM;
91. }
92. *baudRate = device->baudrate;
93. return HDF_SUCCESS;
94. }
95.
96. // 在HdfUartSampleInit方法中绑定
97. struct UartHostMethodg_uartSampleHostMethod = {
98. .Init = SampleInit,
99. .Deinit = SampleDeinit,
100. .Read = NULL,
101. .Write = SampleWrite,
102. .SetBaud = SampleSetBaud,
103. .GetBaud = SampleGetBaud,
104. .SetAttribute = NULL,
105. .GetAttribute = NULL,
106. .SetTransMode = NULL,
107. };
在vendor/huawei/hdf/hdf_vendor.mk编译脚本中增加示例UART驱动模块，代码如下：
1. LITEOS_BASELIB+= -lhdf_uart_sample
2. LIB_SUBDIRS +=$(VENDOR_HDF_DRIVERS_ROOT)/sample/platform/uart
作者：疯壳
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