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116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.
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*
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* The information contained herein is property of Nordic Semiconductor ASA.
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* Terms and conditions of usage are described in detail in NORDIC
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* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
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*
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* Licensees are granted free, non-transferable use of the information. NO
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* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
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* the file.
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*
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include "twi_master.h"
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#include "synaptics_touchpad.h"
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/*lint ++flb "Enter library region" */
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#define PRODUCT_ID_BYTES 10U //!< Number of bytes to expect to be in product ID
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static uint8_t m_device_address; // !< Device address in bits [7:1]
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static const uint8_t expected_product_id[PRODUCT_ID_BYTES] = {'T', 'M', '1', '9', '4', '4', '-', '0', '0', '2'}; //!< Product ID expected to get from product ID query
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bool touchpad_init(uint8_t device_address)
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{
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bool transfer_succeeded = true;
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m_device_address = (uint8_t)(device_address << 1);
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// Do a soft reset
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uint8_t reset_command = 0x01;
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transfer_succeeded &= touchpad_write_register(TOUCHPAD_RESET, reset_command);
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// Page select 0
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uint8_t page_to_select = 0x00;
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transfer_succeeded &= touchpad_write_register(TOUCHPAD_PAGESELECT, page_to_select);
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// Read and verify product ID
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transfer_succeeded &= touchpad_product_id_verify();
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return transfer_succeeded;
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}
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bool touchpad_product_id_verify(void)
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{
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bool transfer_succeeded = true;
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uint8_t product_id[PRODUCT_ID_BYTES];
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transfer_succeeded &= touchpad_product_id_read(product_id, PRODUCT_ID_BYTES);
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for (uint8_t i = 0; i < 10; i++)
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{
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if (product_id[i] != expected_product_id[i])
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{
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transfer_succeeded = false;
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}
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}
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return transfer_succeeded;
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}
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bool touchpad_reset(void)
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{
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uint8_t w2_data[2] = {TOUCHPAD_COMMAND, 0x01};
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return twi_master_transfer(m_device_address, w2_data, 2, TWI_ISSUE_STOP);
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}
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bool touchpad_interrupt_status_read(uint8_t *interrupt_status)
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{
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return touchpad_read_register(TOUCHPAD_INT_STATUS, interrupt_status);
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}
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bool touchpad_set_sleep_mode(TouchpadSleepMode_t mode)
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{
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return touchpad_write_register(TOUCHPAD_CONTROL, (uint8_t)mode);
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}
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bool touchpad_read_register(uint8_t register_address, uint8_t *value)
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{
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bool transfer_succeeded = true;
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transfer_succeeded &= twi_master_transfer(m_device_address, ®ister_address, 1, TWI_DONT_ISSUE_STOP);
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if (transfer_succeeded)
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{
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transfer_succeeded &= twi_master_transfer(m_device_address | TWI_READ_BIT, value, 1, TWI_ISSUE_STOP);
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}
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return transfer_succeeded;
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}
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bool touchpad_write_register(uint8_t register_address, const uint8_t value)
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{
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uint8_t w2_data[2];
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w2_data[0] = register_address;
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w2_data[1] = value;
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return twi_master_transfer(m_device_address, w2_data, 2, TWI_ISSUE_STOP);
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}
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bool touchpad_product_id_read(uint8_t * product_id, uint8_t product_id_bytes)
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{
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uint8_t w2_data[1];
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bool transfer_succeeded = true;
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w2_data[0] = TOUCHPAD_PRODUCT_ID;
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transfer_succeeded &= twi_master_transfer(m_device_address, w2_data, 1, TWI_DONT_ISSUE_STOP);
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if (transfer_succeeded)
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{
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transfer_succeeded &= twi_master_transfer(m_device_address | TWI_READ_BIT, product_id, product_id_bytes, TWI_ISSUE_STOP);
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}
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return transfer_succeeded;
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}
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/*lint --flb "Leave library region" */
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