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/* Copyright 2021 Gompa (@Gompa)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// https://github.com/shinoaliceKabocha/choco60_track/tree/master/keymaps/default
#include "paw3204.h"
#include "wait.h"
#include "debug.h"
#include "gpio.h"
#define REG_PID1 0x00
#define REG_PID2 0x01
#define REG_STAT 0x02
#define REG_X 0x03
#define REG_Y 0x04
#define REG_SETUP 0x06
#define REG_IMGQUAL 0x07
#define REG_IMGREC 0x0E
#define REG_IMGTRASH 0x0D
#define constrain(amt, low, high) ((amt) < (low) ? (low) : ((amt) > (high) ? (high) : (amt)))
// CPI values
enum cpi_values {
CPI400, // 0b000
CPI500, // 0b001
CPI600, // 0b010
CPI800, // 0b011
CPI1000, // 0b100
CPI1200, // 0b101
CPI1600, // 0b110
};
uint8_t paw3204_serial_read(void);
void paw3204_serial_write(uint8_t reg_addr);
uint8_t paw3204_read_reg(uint8_t reg_addr);
void paw3204_write_reg(uint8_t reg_addr, uint8_t data);
void paw3204_init(void) {
gpio_set_pin_output(PAW3204_SCLK_PIN); // setclockpin to output
gpio_set_pin_input_high(PAW3204_SDIO_PIN); // set datapin input high
paw3204_write_reg(REG_SETUP, 0x86); // reset sensor and set 1600cpi
wait_us(5);
paw3204_read_reg(0x00); // read id
paw3204_read_reg(0x01); // read id2
// PAW3204_write_reg(REG_SETUP,0x06); // dont reset sensor and set cpi 1600
paw3204_write_reg(REG_IMGTRASH, 0x32); // write image trashhold
}
uint8_t paw3204_serial_read(void) {
gpio_set_pin_input(PAW3204_SDIO_PIN);
uint8_t byte = 0;
for (uint8_t i = 0; i < 8; ++i) {
gpio_write_pin_low(PAW3204_SCLK_PIN);
wait_us(1);
byte = (byte << 1) | gpio_read_pin(PAW3204_SDIO_PIN);
gpio_write_pin_high(PAW3204_SCLK_PIN);
wait_us(1);
}
return byte;
}
void paw3204_serial_write(uint8_t data) {
gpio_write_pin_low(PAW3204_SDIO_PIN);
gpio_set_pin_output(PAW3204_SDIO_PIN);
for (int8_t b = 7; b >= 0; b--) {
gpio_write_pin_low(PAW3204_SCLK_PIN);
if (data & (1 << b)) {
gpio_write_pin_high(PAW3204_SDIO_PIN);
} else {
gpio_write_pin_low(PAW3204_SDIO_PIN);
}
gpio_write_pin_high(PAW3204_SCLK_PIN);
}
wait_us(4);
}
report_paw3204_t paw3204_read(void) {
report_paw3204_t data = {0};
data.isMotion = paw3204_read_reg(REG_STAT) & (1 << 7); // check for motion only (bit 7 in field)
data.x = (int8_t)paw3204_read_reg(REG_X);
data.y = (int8_t)paw3204_read_reg(REG_Y);
return data;
}
void paw3204_write_reg(uint8_t reg_addr, uint8_t data) {
paw3204_serial_write(0b10000000 | reg_addr);
paw3204_serial_write(data);
}
uint8_t paw3204_read_reg(uint8_t reg_addr) {
paw3204_serial_write(reg_addr);
wait_us(5);
return paw3204_serial_read();
}
void paw3204_set_cpi(uint16_t cpi) {
uint8_t cpival = CPI1000;
if (cpi <= 450) {
cpival = CPI400;
} else if (cpi <= 550) {
cpival = CPI500;
} else if (cpi <= 700) {
cpival = CPI600;
} else if (cpi <= 900) {
cpival = CPI800;
} else if (cpi <= 1100) {
cpival = CPI1000;
} else if (cpi <= 1400) {
cpival = CPI1200;
} else if (cpi > 1400) {
cpival = CPI1600;
}
paw3204_write_reg(REG_SETUP, cpival);
}
uint16_t paw3204_get_cpi(void) {
uint16_t cpival = 1000;
switch (paw3204_read_reg(REG_SETUP) & 0b111) {
case CPI400:
cpival = 400;
break;
case CPI500:
cpival = 500;
break;
case CPI600:
cpival = 600;
break;
case CPI800:
cpival = 800;
break;
case CPI1000:
cpival = 1000;
break;
case CPI1200:
cpival = 1200;
break;
case CPI1600:
cpival = 1600;
break;
}
return cpival;
}
uint8_t read_pid_paw3204(void) {
return paw3204_read_reg(REG_PID1);
}
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