MIKROE-2743

        UT-L 7-SEG R click PID: MIKROE-2743       Add a double 7 segment display to your next project.  UT‐L 7‐SEG R click carries two SMD ultra thin (3.1mm) LED 7‐SEG displays and the MAX6969 constant‐ current LED driver from Maxim Integrated. The click is designed to run on either 3.3V or 5V power  supply. It communicates with the target microcontroller over SPI interface.    Display features How the click works The 7 segment displays are interfaced to the MCU over the MAX6969 16-port, constant-current LED driver IC. It uses the common 4-wire serial bus for communication with MCU itself (LE, SCK, SDO, SDI on mikroBUS™ pin socket). There is an additional OE (output enable) pin which is used to control the output driver state (enabled/disabled). Since it is the PWM output pin on the mikroBUS™ by default, the LED segments light intensity could be controlled by software too. MAX6969 driver features The MAX6969 uses the industry-standard, shift-register-plus-latch-type serial interface. The driver accepts data shifted into a 16-bit shift register using data input DIN and clock input CLK. Input data appears at the DOUT output 16 clock cycles later to allow cascading of multiple MAX6969s. So, the IC allows you to connect multiple click boards™ - for applications that require more than two seven segment displays, such as digital clocks, temperature sensors, etc. Specifications Type  LED Segment  Applications  Displaying digits and letters on two 7 segment displays  Displays  DSM Series Ultra Thin Surface Mount Single Digit 7‐Segment LED Display  On‐board modules  MAX6969 6‐Port, 5.5V Constant‐Current LED Driver  Key Features  Excellent character appearance, low power consumption  Interface  GPIO,SPI  Input Voltage  3.3V or 5V  Click board size  L (57.15 x 25.4 mm)  Pinout diagram This table shows how the pinout on UT-L 7-SEG R click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes  Pin  Pin  Notes    NC  1  AN  PWM  16  OE  PWM control of light intensity  NC  2  RST  INT  15  NC     Load‐Enable input  LE  3  CS  TX  14  NC  SCK  RX  13  NC  Serial Data Output  SDO  5  MISO  SCL  12  NC  Serial Data Input  SDI  MOSI  SDA  11  NC      Clock input  SCK  4  6  Power supply  +3.3V  7  3.3V  5V  10  +5V  Power supply  Ground  GND  8  GND  GND  9  GND  Ground   Jumpers and settings   Designator  Name  JP1  Default  Position  PRW.SEL.  Down  Default  Option  3V3  Description  Power Supply Voltage Selection 3V3/5V, down  position 3V3, up position 5V  Programming Code examples for UT-L 7-SEG R click, written for MikroElektronika hardware and compilers are available on Libstock. Code snippet The following code snippet counts down from 99 to 0 on the displays of the UT-L 7-SEG R click. 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 sbit sbit MAX6969_LE_PIN at RC2_bit; MAX6969_LE_PIN_Direction at TRISC2_bit; uint16_t pwmPeriod; static const uint8_t minus_char = 0x40; void systemInit() { AD1PCFG = 0xFFFF; MAX6969_LE_PIN_Direction = 0; SPI3_Init(); pwmPeriod = PWM_Init(5000, 1, 1, 2); PWM_Start(1); PWM_Set_Duty(pwmPeriod/10, 1); } void MAX6969_Chip_Select() { MAX6969_LE_PIN = 1; asm nop asm nop asm nop 24 MAX6969_LE_PIN = 0; 25 } 26 27 static void U7SEG_Write(uint8_t number) 28 { 29 char numbers[10] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F}; 30 uint8_t tens = number / 10; 31 uint8_t ones = number % 10; 32 if (number > 99) return; 33 34 SPI_Wr_Ptr(numbers[ones]); 35 SPI_Wr_Ptr(numbers[tens]); 36 } 37 38 void main() 39 { 40 uint8_t counter; 41 42 systemInit(); 43 counter = 100; 44 45 while(counter--) 46 { 47 U7SEG_Write(counter); 48 MAX6969_Chip_Select(); 49 Delay_ms(500); 50 } 51 52 SPI_Wr_Ptr(minus_char); 53 SPI_Wr_Ptr(minus_char); 54 MAX6969_Chip_Select(); 55 }                                                                                  https://shop.mikroe.com/ut‐l‐7‐seg‐r‐click 9‐6‐17