MIKROE-2746

        UT-M 7-SEG R click PID: MIKROE-2746 Add a double 7 segment display to your next project. UT-M 7-SEG R click carries two SMD ultra thin 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 the 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  Ultra thin (3.1mm) LED 7‐SEG displays in RED emitting color On‐board modules  MAX6969 6‐Port, 5.5V Constant‐Current LED Driver  Key Features  Excellent character appearance, low power consumption  Interface  SPI  Input Voltage  3.3V or 5V  Click board size  M (42.9 x 25.4 mm)  Pinout diagram This table shows how the pinout on UT-M 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  NC  2  RST  INT  15 NC     3  CS  TX  14 NC  SCK  4  SCK  RX  13 NC  PWM 16 OE  PWM control of light intensity      Load‐Enable input  LE  Clock input  Serial Data Output  SDO  5  MISO  SCL  12 NC  Serial Data Input  SDI  6  MOSI  SDA  11 NC  Power supply  +3.3V  7  3.3V  5V  Ground  GND  8  GND  GND 9  GND Ground  10 +5V Power supply   Jumpers and settings Designator  Name  JP1  Default  Position  PRW.SEL.  Left  Default  Option  3V3  Description  Power Supply Voltage Selection 3V3/5V, left position  3V3, right position 5V  Programming Code examples for UT-M 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-M 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 24 25 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 MAX6969_LE_PIN = 0; } 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‐m‐7‐seg‐r‐click 8‐29‐17