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#include "main.h"
#include "tm1637.h"
#include "stm32f091xc.h"
void _tm1637_micro_delay() {
timer_delay(10);
// for(unsigned int x = 0; x < 10e4; x++);
}
/** @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;
if (pin == PINOUT_DISP_CLK) led_write(0, state);
if (pin == PINOUT_DISP_DIO) led_write(1, state);
}
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_micro_delay();
}
void _tm1637_start() {
_tm1637_pin_write(PINOUT_DISP_DIO, 0);
_tm1637_micro_delay();
}
void _tm1637_stop() {
_tm1637_pin_write(PINOUT_DISP_CLK, 1);
_tm1637_pin_write(PINOUT_DISP_DIO, 1);
_tm1637_micro_delay();
}
bool _tm1637_ack() {
_tm1637_pin_write(PINOUT_DISP_CLK, 0);
_tm1637_pin_write(PINOUT_DISP_DIO, 0);
_tm1637_GPIOMODE_open_drain();
_tm1637_micro_delay();
_tm1637_pin_write(PINOUT_DISP_CLK, 1);
_tm1637_micro_delay();
_tm1637_pin_write(PINOUT_DISP_CLK, 0);
_tm1637_GPIOMODE_gp_output();
_tm1637_micro_delay();
return true;
}
/**
* @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++) {
uint8_t rev_bit = 7 - bit;
_tm1637_pin_write(PINOUT_DISP_CLK, 0);
_tm1637_pin_write(PINOUT_DISP_DIO, (command.data[byte] & (1 << rev_bit)) >> rev_bit);
_tm1637_micro_delay();
_tm1637_pin_write(PINOUT_DISP_CLK, 1);
_tm1637_micro_delay();
}
//TODO: confirm ack
/*bool ack =*/ _tm1637_ack();
}
_tm1637_micro_delay();
// stop condition
_tm1637_stop();
return response;
}
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