wheel capacitive touch sensor driver

i2c.c

@@ -8,13 +8,12 @@
 #include "task.h"
 
 #define I2C_SDA NRF_GPIO_PIN_MAP(0, 11)
-#define I2C_SCL NRF_GPIO_PIN_MAP(0, 22)
+#define I2C_SCL NRF_GPIO_PIN_MAP(0, 2)
 
 static const nrf_drv_twi_t twi0    = NRF_DRV_TWI_INSTANCE(0);
 static SemaphoreHandle_t i2c_sem   = NULL;
 static SemaphoreHandle_t i2c_mutex = NULL;
 static QueueHandle_t i2c_evt_queue = NULL;
-
 void nrf_drv_twi_evt_handler(nrf_drv_twi_evt_t const *p_event, void *p_context)
 {
     BaseType_t xHigherPriorityTaskWoken = pdFALSE;
@@ -53,15 +52,12 @@ void twi0_init(void)
     APP_ERROR_CHECK(err_code);
 
     nrf_drv_twi_enable(&twi0);
-
-    uint8_t buf[8];
-    twi0_write_reg(0xAA, 0x01, buf, 8);
 }
 
 void twi0_write_reg(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data, uint8_t data_len)
 {
     xSemaphoreTake(i2c_mutex, portMAX_DELAY);
-
+    
     static uint8_t i2c_buf[255];
     static nrf_drv_twi_evt_t evt;
     ret_code_t err_code;
@@ -79,7 +75,6 @@ void twi0_write_reg(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data, uint8_t
         /* Transfer completed event. */
         case NRF_DRV_TWI_EVT_DONE:
             // TODO...
-            __BKPT(255);
             break;
         /* Error event: NACK received after sending the address. */
         case NRF_DRV_TWI_EVT_ADDRESS_NACK:
@@ -118,7 +113,6 @@ void twi0_read_reg(uint8_t slave_addr, uint8_t reg_addr, uint8_t *p_rx_buf, uint
         /* Transfer completed event. */
         case NRF_DRV_TWI_EVT_DONE:
             // TODO...
-            __BKPT(255);
             break;
         /* Error event: NACK received after sending the address. */
         case NRF_DRV_TWI_EVT_ADDRESS_NACK:
@@ -143,7 +137,6 @@ void twi0_read_reg(uint8_t slave_addr, uint8_t reg_addr, uint8_t *p_rx_buf, uint
         /* Transfer completed event. */
         case NRF_DRV_TWI_EVT_DONE:
             // TODO...
-            __BKPT(255);
             break;
         /* Error event: NACK received after sending the address. */
         case NRF_DRV_TWI_EVT_ADDRESS_NACK:

main.c

@@ -190,6 +190,28 @@ static void enable_6994_callback(void *pvParameter)
     NRF_LOG_INFO("enable 6994");
 }
 
+extern void twi0_write_reg(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data, uint8_t data_len);
+extern void twi0_read_reg(uint8_t slave_addr, uint8_t reg_addr, uint8_t *p_rx_buf, uint8_t rx_buffer_length);
+
+void touch_sensor_task(void *pArg)
+{
+    /* 
+     * pin assign:
+     * SDA      SCL     INT     VDD     GND
+     * p0.11    p0.02   p0.29   5V0     GND
+     */
+    nrf_gpio_cfg_input(29, NRF_GPIO_PIN_NOPULL);//INT
+
+    for (;;)
+    {
+        bool button = nrf_gpio_pin_read(29);
+        NRF_LOG_INFO("button=%d", button);
+        uint8_t rx_buffer[1];
+        twi0_read_reg(0x50, 0x0D, rx_buffer, 1);
+        vTaskDelay(500);
+    }
+}
+
 static void nrf_sdh_freertos_task_hook(void *p_context)
 {
     extern void twi0_init(void);
@@ -197,11 +219,13 @@ static void nrf_sdh_freertos_task_hook(void *p_context)
 
     UNUSED_PARAMETER(p_context);
 
-    twi0_init();
-    spi_init();
     gpio_init();
+    spi_init();
+    twi0_init();
     led_init();
 
+    xTaskCreate(touch_sensor_task, "touch_sensor_task", 256, NULL, 3, NULL);
+
     NRF_LOG_INFO("LED_GREEN");
     for (int i = 0; i < 12; i++)
     {