implement display functions
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5854fb225d
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166
lib/led_tm1637.c
166
lib/led_tm1637.c
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@ -19,11 +19,19 @@
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* @note peripherals used: GPIO @ref led_tm1637_gpio, timer @ref led_tm1637_timer
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* @note the protocol is very similar to I2C but incompatible for the following reasons: the capacitance is too large for open-drain type output with weak pull-up resistors (push-pull needs to be used, preventing to get ACKs since no indication of the ACK timing is provided); the devices doesn't use addresses; the STM32 I2C will switch to receiver mode when the first sent byte (the I2C address) has last bit set to 1 (such as for address commands with B7=1 where B7 is transmitted last), preventing to send further bytes (the data byte after the address)
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* @warning all calls are blocking
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*
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* bit vs segment: 0bpgfedcba
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* /a\
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* f b p
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* +g+
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* e c p
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* \b/
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*/
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/* standard libraries */
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#include <stdint.h> // standard integer types
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#include <stdlib.h> // general utilities
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#include <string.h> // string utilities
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/* STM32 (including CM3) libraries */
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#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
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@ -50,10 +58,111 @@
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/** @} */
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/** display brightness */
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static enum led_tm1637_brightness_t display_brightness = LED_TM1637_11DIV16;
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static enum led_tm1637_brightness_t display_brightness = LED_TM1637_14DIV16;
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/** if display is on */
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static bool display_on = false;
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/** ASCII characters encoded for the 7 segments digit block
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* @note starts with space
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*/
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static const uint8_t ascii_7segments[] = {
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0x00, // 0b00000000 space
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0x30, // 0b00110000 ! (I)
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0x22, // 0b00100010 "
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0x5c, // 0b01011100 # (o)
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0x6d, // 0b01101101 $ (s)
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0x52, // 0b01010010 % (/)
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0x7d, // 0b01111101 & (6)
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0x20, // 0b00100000 '
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0x39, // 0b00111001 ( ([)
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0x0f, // 0b00001111 )
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0x70, // 0b01110000 *
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0x46, // 0b01000110 +
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0x10, // 0b00010000 ,
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0x40, // 0b01000000 -
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0x10, // 0b00010000 . (,)
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0x52, // 0b01010010 /
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0x3f, // 0b00111111 0
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0x06, // 0b00000110 1
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0x5b, // 0b01011011 2
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0x4f, // 0b01001111 3
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0x66, // 0b01100110 4
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0x6d, // 0b01101101 5
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0x7d, // 0b01111101 6
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0x07, // 0b00000111 7
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0x7f, // 0b01111111 8
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0x6f, // 0b01101111 9
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0x48, // 0b01001000 : (=)
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0x48, // 0b01001000 ; (=)
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0x58, // 0b01011000 <
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0x48, // 0b01001000 =
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0x4c, // 0b01001100 >
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0x53, // 0b01010011 ?
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0x7b, // 0b01111011 @
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0x77, // 0b01110111 A
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0x7f, // 0b01111111 B
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0x39, // 0b00111001 C
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0x5e, // 0b01011110 D
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0x79, // 0b01111001 E
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0x71, // 0b01110001 F
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0x3d, // 0b00111101 G
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0x76, // 0b01110110 H
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0x30, // 0b00110000 I
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0x1e, // 0b00011110 J
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0x76, // 0b01110110 K
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0x38, // 0b00111000 L
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0x37, // 0b00110111 M
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0x37, // 0b00110111 N
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0x3f, // 0b00111111 O
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0x73, // 0b01110011 P
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0x6b, // 0b01101011 Q
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0x33, // 0b00110011 R
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0x6d, // 0b01101101 S
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0x78, // 0b01111000 T
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0x3e, // 0b00111110 U
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0x3e, // 0b00111110 V (U)
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0x3e, // 0b00111110 W (U)
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0x76, // 0b01110110 X (H)
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0x6e, // 0b01101110 Y
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0x5b, // 0b01011011 Z
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0x39, // 0b00111001 [
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0x64, // 0b01100100 '\'
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0x0f, // 0b00001111 /
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0x23, // 0b00100011 ^
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0x08, // 0b00001000 _
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0x02, // 0b00000010 `
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0x5f, // 0b01011111 a
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0x7c, // 0b01111100 b
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0x58, // 0b01011000 c
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0x5e, // 0b01011110 d
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0x7b, // 0b01111011 e
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0x71, // 0b01110001 f
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0x6f, // 0b01101111 g
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0x74, // 0b01110100 h
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0x10, // 0b00010000 i
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0x0c, // 0b00001100 j
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0x76, // 0b01110110 k
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0x30, // 0b00110000 l
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0x54, // 0b01010100 m
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0x54, // 0b01010100 n
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0x5c, // 0b01011100 o
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0x73, // 0b01110011 p
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0x67, // 0b01100111 q
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0x50, // 0b01010000 r
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0x6d, // 0b01101101 s
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0x78, // 0b01111000 t
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0x1c, // 0b00011100 u
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0x1c, // 0b00011100 v (u)
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0x1c, // 0b00011100 w (u)
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0x76, // 0b01110110 x
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0x6e, // 0b01101110 y
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0x5b, // 0b01011011 z
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0x39, // 0b00111001 { ([)
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0x30, // 0b00110000 |
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0x0f, // 0b00001111 } ([)
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0x40, // 0b01000000 ~
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};
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void led_tm1637_setup(void)
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{
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// configure GPIO for CLK and DIO signals
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@ -78,7 +187,7 @@ void led_tm1637_setup(void)
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/** wait until clock tick (timer overflow) occurred
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*/
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static void led_tm1637_tick(void)
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static inline void led_tm1637_tick(void)
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{
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while (!timer_get_flag(TIM(LED_TM1637_TIMER), TIM_SR_UIF)); // wait until counter overflow update event happens
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timer_clear_flag(TIM(LED_TM1637_TIMER), TIM_SR_UIF); // clear event flag
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@ -90,7 +199,7 @@ static void led_tm1637_tick(void)
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* @return if write succeeded
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* @note includes start and stop conditions
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*/
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static bool led_tm1637_write(uint8_t* data, size_t length)
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static bool led_tm1637_write(const uint8_t* data, size_t length)
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{
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bool to_return = true; // return if write succeeded
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if (data==NULL || length==0) { // verify there it data to be read
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@ -109,13 +218,14 @@ static bool led_tm1637_write(uint8_t* data, size_t length)
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// send data bytes (MSb first)
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for (size_t i=0; i<length; i++) { // send all bytes
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uint8_t byte = data[i];
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for (uint8_t b=0; b<8; b++) { // send all bits
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if (data[i]&0x1) { // send a 1
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if (byte&0x1) { // send a 1
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gpio_set(GPIO(LED_TM1637_DIO_PORT), GPIO(LED_TM1637_DIO_PIN)); // put DIO high
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} else {
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gpio_clear(GPIO(LED_TM1637_DIO_PORT), GPIO(LED_TM1637_DIO_PIN)); // put DIO low
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}
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data[i] >>= 1; // shift data
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byte >>= 1; // shift data
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led_tm1637_tick(); // wait for next tick
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gpio_set(GPIO(LED_TM1637_CLK_PORT), GPIO(LED_TM1637_CLK_PIN)); // put CLK high
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led_tm1637_tick(); // wait for next tick (no DIO transition when CLK is high)
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@ -158,47 +268,61 @@ bool led_tm1637_on(void)
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bool led_tm1637_off(void)
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{
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uint8_t data[] = { 0x80+display_brightness }; // command to turn display off (use set brightness)
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bool to_return = false; // result to return
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if (led_tm1637_write(data,LENGTH(data))) { // send command
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display_on = false; // remember display is off
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to_return = true; // command succeeded
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return true; // command succeeded
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}
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return to_return; // return result
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return false; // return result
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}
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bool led_tm1637_brightness(enum led_tm1637_brightness_t brightness)
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{
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bool to_return = false; // result to return
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display_brightness = brightness; // save brightness
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if (display_on) { // adjust brightness if display is on
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to_return = led_tm1637_on(); // adjust brightness
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return led_tm1637_on(); // adjust brightness
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} else {
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to_return = true; // command succeeded
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return true; // command succeeded
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}
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return to_return;
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return false;
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}
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bool led_tm1637_number(uint16_t number)
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{
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(void) number;
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bool to_return = false; // result to return
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uint8_t write_data[] = { 0x40 }; // command: write data, automatic address adding, normal
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uint8_t data[] = { 0xc0, 0xff, 0x00, 0x00, 0xff }; // set address C0H and add data
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uint8_t data[] = { 0xc0, ascii_7segments[((number/1000)%10)+'0'-' '], ascii_7segments[((number/100)%10)+'0'-' '], ascii_7segments[((number/10)%10)+'0'-' '], ascii_7segments[((number/1)%10)+'0'-' '] }; // set address C0H and add data
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if (led_tm1637_write(write_data,LENGTH(write_data)) && led_tm1637_write(data,LENGTH(data))) { // send commands
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to_return = true;
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return true;
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}
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return to_return;
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return false;
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}
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/*
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bool led_tm1637_time(uint8_t hours, uint8_t minutes)
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{
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return true;
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uint8_t write_data[] = { 0x40 }; // command: write data, automatic address adding, normal
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uint8_t data[] = { 0xc0, ascii_7segments[((hours/10)%10)+'0'-' '], ascii_7segments[((hours/1)%10)+'0'-' ']|0x80, ascii_7segments[((minutes/10)%10)+'0'-' '], ascii_7segments[((minutes/1)%10)+'0'-' '] }; // set address C0H and add data
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if (led_tm1637_write(write_data,LENGTH(write_data)) && led_tm1637_write(data,LENGTH(data))) { // send commands
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return true;
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}
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return false;
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}
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bool led_tm1637_text(char* text)
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{
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return true;
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if (strlen(text)!=4) { // input text should have exactly 4 characters
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return false;
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}
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for (uint8_t i=0; i<4; i++) { // input text should only contain printable character (8th bit is used for dots)
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if ((text[i]&0x7f)<' ' || (text[i]&0x7f)>=' '+LENGTH(ascii_7segments)) {
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return false;
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}
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}
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uint8_t write_data[] = { 0x40 }; // command: write data, automatic address adding, normal
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uint8_t data[] = { 0xc0, ascii_7segments[(text[0]&0x7f)-' ']|(text[0]&0x80), ascii_7segments[(text[1]&0x7f)-' ']|(text[1]&0x80), ascii_7segments[(text[2]&0x7f)-' ']|(text[2]&0x80), ascii_7segments[(text[3]&0x7f)-' ']|(text[3]&0x80) }; // set address C0H and add data
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if (led_tm1637_write(write_data,LENGTH(write_data)) && led_tm1637_write(data,LENGTH(data))) { // send commands
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return true;
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}
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return false;
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}
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*/
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@ -63,8 +63,8 @@ bool led_tm1637_number(uint16_t number);
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*/
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bool led_tm1637_time(uint8_t hours, uint8_t minutes);
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/** display text
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* @param[in] text text to display (4 characters)
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* @note use first bit of each character to enable dot
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* @param[in] text text to display (4 characters)
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* @note use first bit of each character to enable dot
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* @return if transmission succeeded
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*/
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bool led_tm1637_text(char* text);
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