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- #include <stdbool.h>
- #include <stdint.h>
- #include "twi_master.h"
- #include "synaptics_touchpad.h"
- #define PRODUCT_ID_BYTES 10U
- static uint8_t m_device_address;
- static const uint8_t expected_product_id[PRODUCT_ID_BYTES] = {'T', 'M', '1', '9', '4', '4', '-', '0', '0', '2'};
- bool touchpad_init(uint8_t device_address)
- {
- bool transfer_succeeded = true;
- m_device_address = (uint8_t)(device_address << 1);
-
- uint8_t reset_command = 0x01;
- transfer_succeeded &= touchpad_write_register(TOUCHPAD_RESET, reset_command);
-
- uint8_t page_to_select = 0x00;
- transfer_succeeded &= touchpad_write_register(TOUCHPAD_PAGESELECT, page_to_select);
-
- transfer_succeeded &= touchpad_product_id_verify();
- return transfer_succeeded;
- }
- bool touchpad_product_id_verify(void)
- {
- bool transfer_succeeded = true;
- uint8_t product_id[PRODUCT_ID_BYTES];
- transfer_succeeded &= touchpad_product_id_read(product_id, PRODUCT_ID_BYTES);
- for (uint8_t i = 0; i < 10; i++)
- {
- if (product_id[i] != expected_product_id[i])
- {
- transfer_succeeded = false;
- }
- }
- return transfer_succeeded;
- }
- bool touchpad_reset(void)
- {
- uint8_t w2_data[2] = {TOUCHPAD_COMMAND, 0x01};
- return twi_master_transfer(m_device_address, w2_data, 2, TWI_ISSUE_STOP);
- }
- bool touchpad_interrupt_status_read(uint8_t *interrupt_status)
- {
- return touchpad_read_register(TOUCHPAD_INT_STATUS, interrupt_status);
- }
- bool touchpad_set_sleep_mode(TouchpadSleepMode_t mode)
- {
- return touchpad_write_register(TOUCHPAD_CONTROL, (uint8_t)mode);
- }
- bool touchpad_read_register(uint8_t register_address, uint8_t *value)
- {
- bool transfer_succeeded = true;
- transfer_succeeded &= twi_master_transfer(m_device_address, ®ister_address, 1, TWI_DONT_ISSUE_STOP);
- if (transfer_succeeded)
- {
- transfer_succeeded &= twi_master_transfer(m_device_address | TWI_READ_BIT, value, 1, TWI_ISSUE_STOP);
- }
- return transfer_succeeded;
- }
- bool touchpad_write_register(uint8_t register_address, const uint8_t value)
- {
- uint8_t w2_data[2];
- w2_data[0] = register_address;
- w2_data[1] = value;
- return twi_master_transfer(m_device_address, w2_data, 2, TWI_ISSUE_STOP);
- }
- bool touchpad_product_id_read(uint8_t * product_id, uint8_t product_id_bytes)
- {
- uint8_t w2_data[1];
- bool transfer_succeeded = true;
- w2_data[0] = TOUCHPAD_PRODUCT_ID;
- transfer_succeeded &= twi_master_transfer(m_device_address, w2_data, 1, TWI_DONT_ISSUE_STOP);
- if (transfer_succeeded)
- {
- transfer_succeeded &= twi_master_transfer(m_device_address | TWI_READ_BIT, product_id, product_id_bytes, TWI_ISSUE_STOP);
- }
- return transfer_succeeded;
- }
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