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#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include "platform.h"
#include "board.h"
#include "eos.h"
#include "event.h"
#include "soc/interrupt.h"
#include "soc/timer.h"
#include "soc/i2c.h"
#include "soc/i2s.h"
#include "dev/eve.h"
#include "eve/eve.h"
#include "eve/eve_touch_engine.h"
#include "gt911.h"
#define CMD_SLEEP 0x05
#define REG_CMD 0x8040
#define REG_CMD2 0x8046
#define REG_STATUS 0x814E
#define REG_POINTS 0x814F
#define REG_CFG 0x8047
#define REG_CHKSUM 0x80FF
#define REG_X_THR 0x8057
#define REG_Y_THR 0x8058
#define REG_PRODID 0x8140
#define SIZE_POINT_BUF 8
#define MAX_POINTS 5
static int clear_tag0 = 0;
static void handle_evt(unsigned char type, unsigned char *buffer, uint16_t len) {
uint8_t status;
uint8_t points[SIZE_POINT_BUF * MAX_POINTS];
int i, num_points;
int rv;
if (!eos_gt911_intr_enabled()) return;
rv = eos_i2c_read16(GT911_ADDR, REG_STATUS, &status, 1);
if (rv) goto handle_evt_fin1;
if (!(status & 0x80)) goto handle_evt_fin1;
num_points = status & 0xf;
if (num_points > 5) goto handle_evt_fin1;
rv = eos_spi_select(EOS_SPI_DEV_EVE);
if (rv) goto handle_evt_fin0;
while (!eve_touch_ehost_ready());
if (num_points) {
if (clear_tag0) {
eve_touch_clear_tag0();
clear_tag0 = 0;
}
rv = eos_i2c_read16(GT911_ADDR, REG_POINTS, points, SIZE_POINT_BUF * num_points);
if (rv) goto handle_evt_fin0;
for (i=0; i<num_points; i++) {
uint8_t *point_buf;
uint8_t point_id;
uint16_t point_x;
uint16_t point_y;
point_buf = points + SIZE_POINT_BUF * i;
point_id = point_buf[0];
point_x = point_buf[1] | (point_buf[2] << 8);
point_y = point_buf[3] | (point_buf[4] << 8);
eve_touch_ehost_enter(point_id, point_x, point_y);
}
} else {
eve_touch_ehost_enter(0, 0x8000, 0x8000);
clear_tag0 = 1;
}
eve_touch_ehost_end();
eos_spi_deselect();
if (!eos_eve_intr_enabled()) {
eos_eve_poll();
}
handle_evt_fin0:
status = 0;
rv = eos_i2c_write16(GT911_ADDR, REG_STATUS, &status, 1);
handle_evt_fin1:
GPIO_REG(GPIO_RISE_IE) |= (1 << CTP_PIN_INT);
}
static void handle_intr(void) {
GPIO_REG(GPIO_RISE_IE) &= ~(1 << CTP_PIN_INT);
GPIO_REG(GPIO_RISE_IP) = (1 << CTP_PIN_INT);
eos_evtq_push_isr(EOS_EVT_CTP | CTP_ETYPE_INTR, NULL, 0);
}
int g911_command(uint8_t command) {
int rv;
if (command > 0x07) {
rv = eos_i2c_write16(GT911_ADDR, REG_CMD2, &command, 1);
if (rv) return rv;
}
rv = eos_i2c_write16(GT911_ADDR, REG_CMD, &command, 1);
if (rv) return rv;
return EOS_OK;
}
static uint8_t gt911_chksum(uint8_t *buf, uint8_t len) {
int i;
uint8_t csum = 0;
for(i=0; i<len; i++) {
csum += buf[i];
}
//csum %= 256;
csum = (~csum) + 1;
return csum;
}
static int gt911_chip_id(char *buf) {
int rv;
rv = eos_i2c_read16(GT911_ADDR, REG_PRODID, buf, 4);
return rv;
}
void eos_gt911_init(void) {
eos_intr_set_handler(INT_GPIO_BASE + CTP_PIN_INT, handle_intr);
eos_intr_set_priority(INT_GPIO_BASE + CTP_PIN_INT, IRQ_PRIORITY_CTP);
eos_evtq_set_handler(EOS_EVT_CTP, handle_evt);
}
void eos_gt911_intr_enable(void) {
GPIO_REG(GPIO_INPUT_EN) |= (1 << CTP_PIN_INT);
GPIO_REG(GPIO_RISE_IE) |= (1 << CTP_PIN_INT);
eos_intr_enable(INT_GPIO_BASE + CTP_PIN_INT);
}
void eos_gt911_intr_disable(void) {
eos_intr_disable(INT_GPIO_BASE + CTP_PIN_INT);
GPIO_REG(GPIO_RISE_IE) &= ~(1 << CTP_PIN_INT);
GPIO_REG(GPIO_INPUT_EN) &= ~(1 << CTP_PIN_INT);
}
int eos_gt911_intr_enabled(void) {
return !!(GPIO_REG(GPIO_INPUT_EN) & (1 << CTP_PIN_INT));
}
void eos_gt911_reset(void) {
eos_gt911_intr_disable();
/* INT and RST output and low */
GPIO_REG(GPIO_OUTPUT_VAL) &= ~((1 << CTP_PIN_INT) | (1 << CTP_PIN_RST));
GPIO_REG(GPIO_OUTPUT_EN) |= ((1 << CTP_PIN_INT) | (1 << CTP_PIN_RST));
/* T2: > 10ms */
eos_time_sleep(12);
/* high: 0x28/0x29 (0x14 7bit), low: 0xBA/0xBB (0x5D 7bit) */
if (GT911_ADDR == 0x14) {
GPIO_REG(GPIO_OUTPUT_VAL) |= (1 << CTP_PIN_INT);
}
/* T3: > 100us */
eos_time_sleep(1);
GPIO_REG(GPIO_OUTPUT_EN) &= ~(1 << CTP_PIN_RST);
/* T4: > 5ms */
eos_time_sleep(6);
GPIO_REG(GPIO_OUTPUT_VAL) &= ~(1 << CTP_PIN_INT);
/* end select I2C slave addr */
/* T5: > 50ms */
eos_time_sleep(51);
/* set INT as input */
GPIO_REG(GPIO_OUTPUT_EN) &= ~(1 << CTP_PIN_INT);
eos_gt911_intr_enable();
}
void eos_gt911_sleep(void) {
eos_gt911_intr_disable();
GPIO_REG(GPIO_OUTPUT_VAL) &= ~(1 << CTP_PIN_INT);
GPIO_REG(GPIO_OUTPUT_EN) |= (1 << CTP_PIN_INT);
g911_command(CMD_SLEEP);
}
void eos_gt911_wake(void) {
/* in case of wake from mcu sleep */
GPIO_REG(GPIO_OUTPUT_EN) |= (1 << CTP_PIN_INT);
GPIO_REG(GPIO_OUTPUT_VAL) |= (1 << CTP_PIN_INT);
eos_time_sleep(5);
GPIO_REG(GPIO_OUTPUT_EN) &= ~(1 << CTP_PIN_INT);
GPIO_REG(GPIO_OUTPUT_VAL) &= ~(1 << CTP_PIN_INT);
eos_gt911_intr_enable();
}
int eos_gt911_cfg_read(uint8_t *cfg_buf) {
int rv;
rv = eos_i2c_read16(GT911_ADDR, REG_CFG, cfg_buf, GT911_SIZE_CFG);
return rv;
}
int eos_gt911_cfg_write(uint8_t *cfg_buf) {
int rv;
cfg_buf[GT911_SIZE_CFG - 2] = gt911_chksum(cfg_buf, GT911_SIZE_CFG - 2);
cfg_buf[GT911_SIZE_CFG - 1] = 1;
rv = eos_i2c_write16(GT911_ADDR, REG_CFG, cfg_buf, GT911_SIZE_CFG);
return rv;
}
int eos_gt911_cfg_print(void) {
int i, rv;
uint8_t cfg_buf[GT911_SIZE_CFG];
rv = eos_gt911_cfg_read(cfg_buf);
if (rv) return rv;
printf("GT911 CFG:\n");
for (i=0; i<GT911_SIZE_CFG-2; i++) {
printf("%.2X", cfg_buf[i]);
if (i % 8 == 7) {
printf("\n");
} else {
printf(" ");
}
}
return EOS_OK;
}
void eos_gt911_set_reg(uint8_t *cfg_buf, uint16_t reg, uint8_t val) {
cfg_buf[reg - REG_CFG] = val;
}
uint8_t eos_gt911_get_reg(uint8_t *cfg_buf, uint16_t reg) {
return cfg_buf[reg - REG_CFG];
}
int eos_gt911_set_threshold(void) {
int rv;
uint8_t cfg_buf[GT911_SIZE_CFG];
rv = eos_gt911_cfg_read(cfg_buf);
if (rv) return rv;
eos_gt911_set_reg(cfg_buf, REG_X_THR, 1);
eos_gt911_set_reg(cfg_buf, REG_Y_THR, 1);
rv = eos_gt911_cfg_write(cfg_buf);
return rv;
}
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