zenermerps/lvgl_esp32_drivers
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working z test before if-else refactor

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This commit is contained in:
Christopher Liebman 2020-12-24 11:26:58 -08:00
parent e85761665e
commit b7ca802bcd
1 changed files with 30 additions and 12 deletions
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42
lvgl_touch/xpt2046.c
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@ -18,8 +18,11 @@
*********************/
#define TAG "XPT2046"
#define CMD_X_READ 0b10010000
#define CMD_Y_READ 0b11010000
#define CMD_X_READ 0b10010000 // NOTE: XPT2046 data sheet says this is actually Y
#define CMD_Y_READ 0b11010000 // NOTE: XPT2046 data sheet says this is actually X
#define CMD_Z1_READ 0b10110000
#define CMD_Z2_READ 0b11000000
#define Z_MIN 400
/**********************
* TYPEDEFS
@ -65,6 +68,14 @@ void xpt2046_init(void)
assert(ret == ESP_OK);
}
static int16_t readVal(uint8_t cmd)
{
uint8_t data[2];
tp_spi_read_reg(cmd, data, 2);
int16_t val = (data[0] << 8) | data[1];
return val;
}
/**
* Get the current position and state of the touchpad
* @param data store the read data here
@ -78,19 +89,26 @@ bool xpt2046_read(lv_indev_drv_t * drv, lv_indev_data_t * data)
int16_t x = 0;
int16_t y = 0;
int16_t z = 0;
uint8_t irq = gpio_get_level(XPT2046_IRQ);
if (irq == 0) {
uint8_t data[2];
tp_spi_read_reg(CMD_X_READ, data, 2);
x = (data[0] << 8) | data[1];
tp_spi_read_reg(CMD_Y_READ, data, 2);
y = (data[0] << 8) | data[1];
ESP_LOGI(TAG, "P(%d,%d)", x, y);
// only compute Z if we think its pressed (irq)
if (irq == 0)
{
int16_t z1 = readVal(CMD_Z1_READ) >> 3;
int16_t z2 = readVal(CMD_Z2_READ) >> 3;
z = z1 + 4096;
z -= z2;
}
if (irq == 0 && z >= Z_MIN) {
x = readVal(CMD_X_READ);
y = readVal(CMD_Y_READ);
ESP_LOGI(TAG, "P(%d,%d,%d)", x, y, z);
/*Normalize Data back to 12-bits*/
x = x >> 4;
y = y >> 4;