1 /*
2 * Copyright (c) 2021 HPMicro
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 */
7
8 #include "hpm_gt911.h"
9 static uint8_t g_i2c_addr;
10
gt911_read_data(gt911_context_t * context,uint16_t addr,uint8_t * buf,uint32_t size)11 hpm_stat_t gt911_read_data(gt911_context_t *context, uint16_t addr, uint8_t *buf, uint32_t size)
12 {
13 uint8_t r[2];
14 r[0] = addr >> 8;
15 r[1] = addr & 0xFF;
16 return i2c_master_address_read(context->ptr, g_i2c_addr, r, sizeof(r), buf, size);
17 }
18
gt911_write_data(gt911_context_t * context,uint16_t addr,uint8_t * buf,uint32_t size)19 hpm_stat_t gt911_write_data(gt911_context_t *context, uint16_t addr, uint8_t *buf, uint32_t size)
20 {
21 uint8_t r[2];
22 r[0] = addr >> 8;
23 r[1] = addr & 0xFF;
24
25 return i2c_master_address_write(context->ptr, g_i2c_addr, r, sizeof(r), buf, size);
26 }
27
gt911_read_register(gt911_context_t * context,uint16_t reg,uint8_t * buf)28 hpm_stat_t gt911_read_register(gt911_context_t *context, uint16_t reg, uint8_t *buf)
29 {
30 return gt911_read_data(context, reg, buf, 1);
31 }
32
gt911_write_register(gt911_context_t * context,uint16_t reg,uint8_t val)33 hpm_stat_t gt911_write_register(gt911_context_t *context, uint16_t reg, uint8_t val)
34 {
35 return gt911_write_data(context, reg, &val, 1);
36 }
37
gt911_soft_reset(gt911_context_t * context)38 hpm_stat_t gt911_soft_reset(gt911_context_t *context)
39 {
40 return gt911_write_register(context, GT911_CMD, 0);
41 }
42
gt911_calcualte_config_data_checksum(uint8_t * config)43 static uint8_t gt911_calcualte_config_data_checksum(uint8_t *config)
44 {
45 uint8_t checksum = 0;
46 for (uint32_t i = 0; i < GT911_CONFIG_DATA_SIZE - 2; i++) {
47 checksum += config[i];
48 }
49 return (~checksum + 1);
50 }
51
gt911_read_config(gt911_context_t * context,uint8_t * buf,uint8_t size)52 hpm_stat_t gt911_read_config(gt911_context_t *context, uint8_t *buf, uint8_t size)
53 {
54 return gt911_read_data(context, GT911_CONFIG, buf, size);
55 }
56
gt911_init(gt911_context_t * context,uint16_t width,uint16_t height)57 hpm_stat_t gt911_init(gt911_context_t *context, uint16_t width, uint16_t height)
58 {
59 hpm_stat_t stat = status_success;
60 uint8_t config[GT911_CONFIG_DATA_SIZE] = {0};
61
62 #ifdef GT911_I2C_ADDR
63 g_i2c_addr = GT911_I2C_ADDR;
64 stat = gt911_read_data(context, GT911_CONFIG, config, sizeof(config));
65 if (stat != status_success) {
66 return stat;
67 }
68 #elif !GT911_NO_AUTO_PROBE
69 g_i2c_addr = GT911_I2C_ADDR0;
70 stat = gt911_read_data(context, GT911_CONFIG, config, sizeof(config));
71 if (stat != status_success) {
72 printf("0x%x failed to init GT911", g_i2c_addr);
73 g_i2c_addr = GT911_I2C_ADDR1;
74 printf(", try 0x%x\n", g_i2c_addr);
75 stat = gt911_read_data(context, GT911_CONFIG, config, sizeof(config));
76 }
77 if (stat != status_success) {
78 return stat;
79 }
80 #else
81 g_i2c_addr = GT911_I2C_ADDR0;
82 stat = gt911_read_data(context, GT911_CONFIG, config, sizeof(config));
83 if (stat != status_success) {
84 return stat;
85 }
86 #endif
87
88 if (config[GT911_CONFIG_DATA_SIZE - 2] != gt911_calcualte_config_data_checksum(config)) {
89 return status_fail;
90 }
91
92 /* stat = gt911_read_data(context, GT911_ID_B0, (uint8_t*)&val, sizeof(val)); */
93 /* if (stat != status_success) { */
94 /* return stat; */
95 /* } */
96
97 /* if (val != GT911_PRODUCT_ID) { */
98 /* return status_fail; */
99 /* } */
100
101 config[GT911_CONFIG_DATA_RESOLUTION_XL] = width & 0xFF;
102 config[GT911_CONFIG_DATA_RESOLUTION_XH] = width >> 8;
103 config[GT911_CONFIG_DATA_RESOLUTION_YL] = height & 0xFF;
104 config[GT911_CONFIG_DATA_RESOLUTION_YH] = height >> 8;
105 config[GT911_CONFIG_DATA_TOUCH_NUMBER] = 5;
106 config[GT911_CONFIG_DATA_MODULE_SWITCH1] = (config[GT911_CONFIG_DATA_MODULE_SWITCH1] & ~0x3);
107
108 config[GT911_CONFIG_DATA_SIZE - 2] = gt911_calcualte_config_data_checksum(config);
109 config[GT911_CONFIG_DATA_SIZE - 1] = 1;
110 /*
111 * for (uint8_t i = 0; i < 5; i++) {
112 * gt911_write_data(context, GT911_CONFIG, config, GT911_CONFIG_DATA_SIZE);
113 * }
114 */
115 gt911_write_register(context, GT911_CMD, GT911_CMD_SOFT_RESET);
116 return status_success;
117 }
118
gt911_read_touch_data(gt911_context_t * context,gt911_touch_data_t * touch_data)119 hpm_stat_t gt911_read_touch_data(gt911_context_t *context,
120 gt911_touch_data_t *touch_data)
121 {
122 hpm_stat_t stat = status_success;
123
124 stat = gt911_read_data(context, GT911_STATUS,
125 (uint8_t *)touch_data, sizeof(gt911_touch_data_t));
126 if (stat != status_success) {
127 return stat;
128 }
129
130 gt911_write_register(context, GT911_STATUS, 0);
131
132 return stat;
133 }
134