cst816s: Initial include of cst816s touch screen driver

drivers/Makefile.dep

@@ -139,6 +139,13 @@ ifneq (,$(filter ccs811,$(USEMODULE)))
   USEMODULE += xtimer
 endif
 
+ifneq (,$(filter cst816s,$(USEMODULE)))
+  FEATURES_REQUIRED += periph_gpio_irq
+  FEATURES_REQUIRED += periph_gpio
+  FEATURES_REQUIRED += periph_i2c
+  USEMODULE += xtimer
+endif
+
 ifneq (,$(filter dcf77,$(USEMODULE)))
   FEATURES_REQUIRED += periph_gpio
   FEATURES_REQUIRED += periph_gpio_irq

drivers/Makefile.include

@@ -64,6 +64,10 @@ ifneq (,$(filter ccs811,$(USEMODULE)))
   USEMODULE_INCLUDES += $(RIOTBASE)/drivers/ccs811/include
 endif
 
+ifneq (,$(filter cst816s,$(USEMODULE)))
+  USEMODULE_INCLUDES += $(RIOTBASE)/drivers/cst816s/include
+endif
+
 ifneq (,$(filter dcf77,$(USEMODULE)))
   USEMODULE_INCLUDES += $(RIOTBASE)/drivers/dcf77/include
 endif

drivers/cst816s/Makefile

@@ -0,0 +1 @@
+include $(RIOTBASE)/Makefile.base

drivers/cst816s/cst816s.c

@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2020 Koen Zandberg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     drivers_cst816s
+ * @{
+ *
+ * @file
+ * @brief       Device driver implementation for cst816s touch screen
+ *
+ * @author      koen Zandberg <[email protected]>
+ *
+ * @}
+ */
+
+#include "log.h"
+#include "periph/gpio.h"
+#include "periph/i2c.h"
+#include "xtimer.h"
+
+#include "cst816s.h"
+#include "cst816s_internal.h"
+
+#define ENABLE_DEBUG        (0)
+#include "debug.h"
+
+static void _gpio_irq(void *arg)
+{
+    cst816s_t *dev = arg;
+
+    dev->cb(dev, dev->cb_arg);
+}
+
+static void _cst816s_reset(cst816s_t *dev)
+{
+    /* Reset, sleep durations based on
+     * https://github.com/lupyuen/hynitron_i2c_cst0xxse/blob/master/cst0xx_core.c#L1078-L1085 */
+    gpio_clear(dev->params->reset);
+    xtimer_usleep(CST816S_RESET_DURATION_LOW);
+    gpio_set(dev->params->reset);
+    xtimer_usleep(CST816S_RESET_DURATION_HIGH);
+}
+
+int cst816s_read(cst816s_t *dev, cst816s_touch_data_t *data)
+{
+    uint8_t buf[9]; /* 3 bytes "header" and 6 bytes touch info */
+
+    i2c_acquire(dev->params->i2c_dev);
+    int res = i2c_read_regs(dev->params->i2c_dev, dev->params->i2c_addr,
+                            0, buf, sizeof(buf), 0);
+    i2c_release(dev->params->i2c_dev);
+
+    if (res < 0) {
+        return res;
+    }
+
+    data->gesture = buf[1];
+    data->action = buf[3] >> 6;
+    data->x = (buf[3] & 0x0f) << 8 | buf[4];
+    data->y = (buf[5] & 0x0f) << 8 | buf[6];
+
+    return 0;
+}
+
+int cst816s_init(cst816s_t *dev, const cst816s_params_t *params,
+                 cst816s_irq_cb_t cb, void *arg)
+{
+    assert(dev && params);
+    dev->params = params;
+    dev->cb = cb;
+    dev->cb_arg = arg;
+
+    gpio_init(dev->params->reset, GPIO_OUT);
+    _cst816s_reset(dev);
+
+    if (cb) {
+        int res = gpio_init_int(dev->params->irq, GPIO_IN,
+                                dev->params->irq_flank,
+                                _gpio_irq, dev);
+        if (res < 0) {
+            return CST816S_ERR_IRQ;
+        }
+    }
+    return CST816S_OK;
+    /* The device will not respond until the first touch event */
+}

drivers/cst816s/include/cst816s_internal.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2020 Koen Zandberg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+#ifndef CST816S_INTERNAL_H
+#define CST816S_INTERNAL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define CST816S_RESET_DURATION_LOW      (20 * US_PER_MS)
+#define CST816S_RESET_DURATION_HIGH     (400 * US_PER_MS)
+
+#define CST816S_REG_INT_CNT                     0x8F
+#define CST816S_REG_FLOW_WORK_CNT               0x91
+#define CST816S_REG_WORKMODE                    0x00
+#define CST816S_REG_WORKMODE_FACTORY_VALUE      0x40
+#define CST816S_REG_WORKMODE_WORK_VALUE         0x00
+#define CST816S_REG_CHIP_ID                     0xA3
+#define CST816S_REG_CHIP_ID2                    0x9F
+#define CST816S_REG_POWER_MODE                  0xA5
+#define CST816S_REG_FW_VER                      0xA6
+#define CST816S_REG_VENDOR_ID                   0xA8
+#define CST816S_REG_LCD_BUSY_NUM                0xAB
+#define CST816S_REG_FACE_DEC_MODE_EN            0xB0
+#define CST816S_REG_GLOVE_MODE_EN               0xC0
+#define CST816S_REG_COVER_MODE_EN               0xC1
+#define CST816S_REG_CHARGER_MODE_EN             0x8B
+#define CST816S_REG_GESTURE_EN                  0xD0
+#define CST816S_REG_GESTURE_OUTPUT_ADDRESS      0xD3
+#define CST816S_REG_ESD_SATURATE                0xED
+
+#define CST816S_REG_POWER_MODE_SLEEP_VALUE      0x03
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CST816_INTERNAL_H */
+/** @} */

drivers/cst816s/include/cst816s_params.h

@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2020 Koen Zandberg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+
+/**
+ * @ingroup     drivers_cst816s
+ *
+ * @brief       Default configuration for the CST816S touch screen driver
+ *
+ *
+ * @author      koen Zandberg <[email protected]>
+ */
+
+#ifndef CST816S_PARAMS_H
+#define CST816S_PARAMS_H
+
+#include "board.h"
+#include "cst816s.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name    Set default configuration parameters for the CST816S
+ * @{
+ */
+/* I2C configuration */
+#ifndef CST816S_PARAM_I2C_DEV
+#define CST816S_PARAM_I2C_DEV        I2C_DEV(0)
+#endif
+
+#ifndef CST816S_PARAM_I2C_ADDR
+#define CST816S_PARAM_I2C_ADDR       (0x15)
+#endif
+
+#ifndef CST816S_PARAM_IRQ
+#define CST816S_PARAM_IRQ            GPIO_PIN(0, 28)
+#endif
+
+#ifndef CST816S_PARAM_IRQ_FLANK
+#define CST816S_PARAM_IRQ_FLANK      GPIO_FALLING
+#endif
+
+#ifndef CST816S_PARAM_RESET
+#define CST816S_PARAM_RESET          GPIO_PIN(0, 10)
+#endif
+
+
+#define CST816S_PARAMS                      \
+    {                                       \
+        .i2c_dev   = CST816S_PARAM_I2C_DEV,  \
+        .i2c_addr  = CST816S_PARAM_I2C_ADDR, \
+        .irq       = CST816S_PARAM_IRQ,       \
+        .irq_flank = CST816S_PARAM_IRQ_FLANK, \
+        .reset     = CST816S_PARAM_RESET,    \
+    }
+/**@}*/
+
+/**
+ * @brief   Configure BMX280
+ */
+static const cst816s_params_t cst816s_params[] =
+{
+   CST816S_PARAMS
+};
+
+/**
+ * @brief   The number of configured sensors
+ */
+#define CST816S_NUMOF    ARRAY_SIZE(cst816s_params)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BMX280_PARAMS_H */
+/** @} */
+