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#include "main.h"
#include "tm1637.h"
#include "stm32f091xc.h"
/** @brief reset gpio mode registers for dio */
void _tm1637_GPIOMODE_reset() {
GPIOA->MODER &= ~(0b11 << (PINOUT_DISP_DIO * 2));
GPIOA->PUPDR &= ~(0b11 << (PINOUT_DISP_DIO * 2));
GPIOA->OTYPER &= ~(0b1 << PINOUT_DISP_DIO);
}
/** @brief set dio to general-purpose output mode */
void _tm1637_GPIOMODE_gp_output() {
_tm1637_GPIOMODE_reset();
GPIOA->MODER |= (0b01 << (PINOUT_DISP_DIO * 2));
}
/** @brief set dio to open drain input mode */
void _tm1637_GPIOMODE_open_drain() {
_tm1637_GPIOMODE_reset();
GPIOA->MODER |= (0b10 << (PINOUT_DISP_DIO * 2));
GPIOA->OTYPER |= (0b1 << PINOUT_DISP_DIO);
}
/**
* @brief gpio write abstraction function
* @param pin pin to write
* @param state state to set `pin` to
*/
void _tm1637_pin_write(uint32_t pin, bool state) {
GPIOA->ODR ^= (((GPIOA->ODR & (1 << pin)) >> pin) ^ state) << pin;
}
void _tm1637_start() {
_tm1637_pin_write(PINOUT_DISP_DIO, 0);
}
void _tm1637_stop() {
_tm1637_pin_write(PINOUT_DISP_CLK, 1);
_tm1637_pin_write(PINOUT_DISP_DIO, 1);
}
bool _tm1637_ack() {
bool ack = false;
_tm1637_pin_write(PINOUT_DISP_CLK, 0);
_tm1637_pin_write(PINOUT_DISP_DIO, 0);
_tm1637_GPIOMODE_open_drain();
ack = (GPIOA->IDR & (1 << PINOUT_DISP_DIO)) == 0;
_tm1637_pin_write(PINOUT_DISP_CLK, 1);
_tm1637_pin_write(PINOUT_DISP_CLK, 0);
_tm1637_GPIOMODE_gp_output();
return ack;
}
/**
* @brief send data to TM1637
* @param command command to send
* @return response data as TM1637Response struct
*/
TM1637Sequence _tm1637_send(TM1637Sequence command) {
TM1637Sequence response = { .data = 0, .length = 0 };
_tm1637_start();
for (uint32_t byte = 0; byte < command.length; byte++) {
for (uint8_t bit = 0; bit < 8; bit++) {
_tm1637_pin_write(PINOUT_DISP_CLK, 0);
_tm1637_pin_write(PINOUT_DISP_DIO, (command.data[byte] & (1 << bit)) >> bit);
_tm1637_pin_write(PINOUT_DISP_CLK, 1);
}
bool ack = _tm1637_ack();
if (!ack) byte -= 1;
}
_tm1637_stop();
return response;
}
void tm1637_dispcfg(uint8_t brightness, bool on) {
uint8_t dis_data[] = {
(uint8_t)(0b10000000 | (on << 3) | (brightness)),
};
TM1637Sequence seq = {
.data = dis_data,
.length = 1,
};
_tm1637_send(seq);
}
void tm1637_segmentsend(uint8_t segment, uint8_t data) {
uint8_t dis_data[] = {
(uint8_t)(0b11000000 | segment),
data,
};
TM1637Sequence seq = {
.data = dis_data,
.length = 2,
};
_tm1637_send(seq);
}
void _tm1637_clear() {
for (unsigned int x = 0; x < 4; x++)
tm1637_segmentsend(x, 0);
}
void tm1637_begin() {
_tm1637_GPIOMODE_gp_output();
// general purpose output mode for clk
GPIOA->MODER &= ~(0b11 << (PINOUT_DISP_CLK * 2));
GPIOA->MODER |= (0b01 << (PINOUT_DISP_CLK * 2));
_tm1637_pin_write(PINOUT_DISP_CLK, 1);
_tm1637_pin_write(PINOUT_DISP_DIO, 1);
_tm1637_clear();
}
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