Contex-M0 (lpc1114)-based tinyhmi keyboard driver

 

/*************************************** **************************************** * ************************ <Br/> macro definition <br/> ***** **************************************** **************************************** * ******************/<br/> # define rck (1ul <2) <br/> # define rck_low gpio2data & = ~ Rck <br/> # define rck_high gpio2data | = rck <br/> # define rck_set iocon_pio2_2 = func_pio2_2; gpio2dir | = rck <br/> # define key (1ul <9) <br/> # define key_set iocon_pio2_9 = func_pio2_9; gpio2dir & = ~ Key <br/> # define mosi_set iocon_pio0_9 = pio0_9_mosi0 <br/> # define clk_set iocon_pio0_6 = empty <br/> /************** **************************************** **************************************** * ********** <br/> global variables <br/> ******************* **************************************** **************************************** * *****/<br/> uint32 const data [11] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0 X07, 0x7f, 0x6f, 0x00}; // segment code table, 0 ~ 9 and "Black Code" <br/> uint8 bit [8] = {0, 0, 0, 0, 0, 0}; // keep each bit after decomposition (displayed on the digital tube) <br/> int I _move_bit = 0; // bitcode cyclic variable <br/> uint8 whichkeydown = 9; // indicates which key is pressed, 0 ~ Key 7. <Br/> uint8 modifybit = 9; // bit being modified <br/> uint8 modify = 0; // whether the State is being modified, 1 is yes, 0: No <br/> uint32 num_right4bit = 3210, num_left4bit = 7654; // X is displayed on the right, and Y is on the left <br/> uint32 blackbitdly = 0; // latency variable in the blinking bit <br/> /*************************** **************************************** * ******** <br/> ** breaknum_right function: break down a 4-digit digital tube to the right <br/> *************************** **************************************** * ********/<br/> void break Num_right (INT const num) <br/>{< br/> bit [0] = num % 10; <br/> bit [1] = (Num/10) % 10; <br/> bit [2] = (Num/100) % 10; <br/> bit [3] = (Num/1000) % 10; <br/>}< br/> /****************************** **************************************** * ***** <br/> ** breaknum_left function: break down a four-digit digital tube to the left <br/> *************************** **************************************** * ********/<br/> void breaknum_left (INT const num) <br/>{< br/> B It [4] = num % 10; <br/> bit [5] = (Num/10) % 10; <br/> bit [6] = (Num/100) % 10; <br/> bit [6] = (Num/1000) % 10; <br/>}< br/> /****************************** **************************************** * ***** <br/> ** keyboardinit function: parameters required to initialize the keyboard Board <br/> **************************** **************************************** * *******/<br/> void keyboardinit (void) <br/> {<br/> // num_right4bit = 3210; num_left4bit = 7654; <br/> brea Knum_right (num_right4bit); <br/> breaknum_left (num_left4bit ); <br/>}< br/> /****************************** **************************************** * ***** <br/> ** sendnum function: send a scan <br/> ********************************* **************************************** * **/<br/> void sendnum (void) <br/>{< br/> rck_low; // STR low <br/> If (I _move_bit = modifybit) // in the modified state, flashing change bit <br/>{< br/> blackbitdly ++; <br/> If (BL Ackbitdly <30) <br/>{< br/> ssp0dr = data [10]; // send a black code disconnection Code <br/>}< br/> else <br/> ssp0dr = data [bit [I _move_bit]; // transfer data a content (normal segment code) <br/> If (blackbitdly> 60) <br/> blackbitdly = 0; <br/>}< br/> else // in non-modified state, no blinking <br/>{< br/> ssp0dr = data [bit [I _move_bit]; // The transmitted data a content (normal field code) <br/>}< br/> while (ssp0sr & 0x01) = 0); // wait until the transfer ends <br/> ssp0dr = 0xff &(~ (1 <(I _move_bit); // transmitted data B content (bit code) <br/> while (ssp0sr & 0x01) = 0 ); // wait until the transfer ends <br/> rck_high; // STR high level (generates a rising edge) <br/>}< br/> /****************************** **************************************** * ***** <br/> ** gpio_init <br/> *********************** **************************************** * ************/<br/> void gpio_init (void) <br/>{< br/> rck_set; <br/> clk_set; <br/> mosi_set; <br/> key_set; </P> <p> I Ocon_pio0_2 = pio0_2_gpio; <br/>}< br/> /****************************** **************************************** * ********************************* <br/> * * Function Name: ssp_init () <br/> ** descriptions: Set SSP controller to host SPI. <Br/> ** input parameters: None <br/> ** output parameters: None <br/> ** returned value: none <br/> *********************************** **************************************** * ****************************/<br/> void ssp_init (void) <br/> {<br/> presetctrl | = 0x01;/* disable spi0 reset */<br/> // iocon_sckloc = 0x02; /* configure IIS6 as sck */<br/> sysahbclkctrl | = (1ul <11);/* enable spi0 peripherals */<br/> ssp0clkdiv = 0x01; /* SSP clock points Frequency */</P> <p> ssp0cr0 = (0x00 <8) | // This sentence is the culprit of my tragedy for a week !!! (0x01 <8) frequency division causes frequency problems !!! /* Set SPI clock frequency division for SCR */<br/> (0x00 <7) |/* cpha clock output phase, */<br/>/* only valid in SPI mode */<br/> (0x01 <6) |/* cpol clock output polarity, */<br/>/* only valid in SPI mode */<br/> (0x00 <4) |/* FRF frame format 00 = SPI, 01 = SSI, */<br/>/* 10 = Microwire, 11 = reserved */<br/> (0x07 <0);/* DSS Data Length, 0000-0010 = reserved */<br/>/* 0011 = 4 bits, 0111 = 8 bits, 1111 = 16-bit */<br/> ssp0cr1 = (0x00 <3) |/* output of SOD from the server, 1 = disabled */<br/> (0x00 <2) |/* MS Master/Slave selection, 0 = host, 1 = slave */<B R/> (0x01 <1) |/* sse ssp enabling */<br/> (0x00 <0 ); /* LBM write-back mode */</P> <p> ssp0cpsr = 2;/* pclk crossover value */<br/> ssp0rn = 0x03; /* interrupt clearing register */<br/>}< br/> /*********************** **************************************** * ************ <br/> ** interrupt service program timer0_server <br/> ************* **************************************** * *********************/<br/> void timer0isr (void) <br/>{< br/> sendnum (); <br/> If (0 = (gpio2data & Key) // If a key is pressed, <br/> {// obtain the key ID by connecting to the Key location code <br/> whichkeydown = I _move_bit; <br/>}< br/> else if (I _move_bit = whichkeydown) // process keys <br/>{< br/> switch (I _move_bit) <br/> {<br/> case 7: {// enter or exit the modification state <br/> modify =! Modify; <br/> if (1 = Modify) // If the modified state is entered <br/> {<br/> modifybit = 0; <br/>}< br/> else // If the status is not modified <br/> {<br/> num_right4bit = bit [3] * 1000 + bit [2] * 100 + bit [1] * 10 + bit [0]; <br/> num_left4bit = bit [7] * 1000 + bit [6] * 100 + bit [5] * 10 + bit [4]; <br/> breaknum_right (num_right4bit); <br/> breaknum_left (num_left4bit); <br/> modifybit = 9; <br/>}< br/>} break; <br/> case 6: {// move the modified digit <br/> if (1 = Modify) // if you enter the modified state <br/>{< br/> modifybit = (modifybit + 1) % 8; <br/>}< br/>} break; <br/> case 5: {// modify digits + 1 <br/> if (1 = Modify) // if you enter the modified state <br/>{< br/> bit [modifybit] = (bit [modifybit] + 1) % 10; // function: + 1 </P> <p >}< br/>} break; <br/> case 4: {// modify the digit-1 <br/> if (1 = Modify) // if you enter the modified state <br/>{< br/> bit [modifybit] = (bit [modifybit] + 9) % 10; // function:-1 <br/>}< br/>} break; <br/> case 3: {</P> <p >} break; <br/> case 2 :{</P> <p>} break; <br/> case 1 :{</P> <p>} break; <br/> case 0: {</P> <p>} break; <br/> default: {<br/> break; <br/>}< br/> whichkeydown = 9; <br/>}< br/> I _move_bit = (I _move_bit + 1) & 0x07; // bitcode loop // This write improves efficiency <br/> tmr32b0ir = 0x01; // clear the interrupt mark <br/>}< br/> /************************* **************************************** * ********** <br/> ** timer0init <br/> ****************** **************************************** * ****************/<br/> void timer0init (void) <br/> {<br/> sysahbclkctrl | = (1ul <9); // enable the timer module <br/> tmr32b0ctl = 0x02; // reset the timer (reset) <br/> tmr32b0pr = 0x00; // No Frequency Division <br/> tmr32b0mcr = 0x03; // interrupt occurs during Matching and reset the counter <br/> tmr32b0mr0 = fahbclk/500; // match once every 1/500 seconds (although the scanning frequency of timer interruption is 500, however, the average frequency of each digital digit is only 500/8. (If the actual frequency is greater than 300, no flash will be visible.) <br/> tmr32b0ir | = 0x01; // clear the channel 0 (mr0) interrupt flag <br/> zyisrset (nvic_timer32b0, (unsigned long) timer0isr, prio_two ); // set the interrupt and enable <br/> tmr32b0ctl = 0x01; // enable the timer with 0 counters <br/>}< br/> void keyboard_set (void) <br/>{< br/> gpio_init (); <br/> ssp_init (); <br/> keyboardinit (); <br/> timer0init (); <br/>} 

This is the header file for controlling the keyboard board. You only need to call this in the main function: Num_left4bit = num1; // update the data num1 to be displayed on the left-side digital tube Breaknum_left (num1 ); Num_right4bit = num2; // update the data num2 to be displayed on the left-side digital tube Breaknum_right (num2 ); This program was transplanted from the keyboard program on the previous 2103. 2103 key board DRIVER: http://www.jxust3jia1.com/BBS/viewthread.php? Tid = 10536 & extra = Page % 3d2