Implement polled mode and key bitmap change signalling via external interrupt
- this firmware consumes about 4-5 mA (can be probably made lower)
This commit is contained in:
Ondrej Jirman
parent
a9bb6a3691
commit
bca8c47f46
144
firmware/main.c
144
firmware/main.c
@ -18,23 +18,28 @@
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*/
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#include <stdint.h>
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#include <string.h>
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#include <em85f684a.h>
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// configuration (we can make this runtime configurable via i2c)
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// polled input mode is necessary if some rows are always on
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#define POLL_INPUT 1
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#define BIT(n) (1u << (n))
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// we just use this interrupt for wakeup from sleep on input change
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void pinchange_interupt(void) __interrupt(IRQ_PINCHANGE)
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{
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// disable all input change interrupts
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P0_ICEN = BIT(5);
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}
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// timers clock is 2 MHz so we need to wait for 2000 ticks to get delay of 1ms
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#define T0_SET_TIMEOUT(n) { \
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TL0 = 0x00; \
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TH0 = (0x10000u - n) >> 8; \
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TL0 = (0x10000u - n) & 0xff; \
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}
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#define T1_SET_TIMEOUT(n) { \
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TL1 = 0x00; \
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TH1 = (0x10000u - n) >> 8; \
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TL1 = (0x10000u - n) & 0xff; \
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}
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#define delay_us(n) { \
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TL0 = 0x00; \
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TF0 = 0; \
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@ -43,6 +48,38 @@ void pinchange_interupt(void) __interrupt(IRQ_PINCHANGE)
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while (!TF0); \
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}
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static __sbit p6_changed = 0;
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static __sbit run_tasks = 0;
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// we use this interrupt for wakeup from sleep on input change
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void pinchange_interupt(void) __interrupt(IRQ_PINCHANGE)
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{
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uint8_t saved_page = PAGESW;
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PAGESW = 0;
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if (P0_ICEN & BIT(1))
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p6_changed = 1;
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// clear input change flags
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P0_ICEN = BIT(5);
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PAGESW = saved_page;
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}
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// we use this interrupt as a scheduling tick (wakeup from sleep)
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void timer1_interupt(void) __interrupt(IRQ_TIMER1)
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{
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run_tasks = 1;
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// 20 ms
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T1_SET_TIMEOUT(40000);
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TF1 = 0;
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}
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// Keyboard has 12 columns and 6 rows directly connected to GPIOs.
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//
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// C1 P95
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@ -111,14 +148,29 @@ void keyscan_idle(void)
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P8 &= 0xfe;
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P9 &= 0x1f;
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#if POLL_INPUT
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// make all columns an input, hi-Z (saves power)
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P0_P5M0 = ~0x00u;
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P0_P8M0 |= ~0xfeu;
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PAGESW = 1;
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P1_P9M0 |= ~0x1fu;
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ICIE = 0;
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p6_changed = 0;
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#else
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P0_P5M0 = 0x00;
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P0_P8M0 &= 0xfe;
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PAGESW = 1;
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P1_P9M0 &= 0x1f;
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// enable input change interrupt on port6 and clear the flag
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// enable input change interrupt on port6 and clear the interrupt flag after
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// things stabilize
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delay_us(10);
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PAGESW = 0;
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p6_changed = 0;
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P0_ICEN = BIT(5);
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ICIE = 1;
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#endif
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}
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uint8_t keyscan_idle_is_pressed(void)
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@ -144,13 +196,16 @@ void keyscan_active(void)
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P8 &= 0xfe;
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P9 &= 0x1f;
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// make all columns an input (hi-Z) in preparation for individual
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// column scanning
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P0_P5M0 = ~0x00u;
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P0_P8M0 |= ~0xfeu;
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PAGESW = 1;
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P1_P9M0 |= ~0x1fu;
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}
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// XXX: we can debounce in the scan function too (3us?)
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// XXX: do we need to debounce in the scan function?
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// XXX: it looks like that there should be no bouncing going on mechanically
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// 12 byte storage required
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uint8_t keyscan_scan(uint8_t* res)
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@ -166,7 +221,7 @@ uint8_t keyscan_scan(uint8_t* res)
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PAGESW = 1;
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for (pin = 5; pin <= 7; pin++) {
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P1_P9M0 &= ~BIT(pin);
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delay_us(10);
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delay_us(3);
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row = ~P6 & 0x3f;
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mask |= row;
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*res++ = row;
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@ -176,7 +231,7 @@ uint8_t keyscan_scan(uint8_t* res)
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PAGESW = 0;
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for (pin = 0; pin <= 7; pin++) {
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P0_P5M0 &= ~BIT(pin);
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delay_us(10);
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delay_us(3);
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row = ~P6 & 0x3f;
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mask |= row;
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*res++ = row;
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@ -184,7 +239,7 @@ uint8_t keyscan_scan(uint8_t* res)
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}
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P0_P8M0 &= ~BIT(0);
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delay_us(10);
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delay_us(3);
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row = ~P6 & 0x3f;
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mask |= row;
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*res++ = row;
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@ -308,18 +363,15 @@ void main(void)
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// set both timers to 16-bit counter modes
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TMOD = 0x11;
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// timers clock is 2 MHz so we need to wait for 2000 ticks to get delay of 1ms
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//T0_SET_TIMEOUT(2000);
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// enable both timers
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TCON = 0x50;
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// setup watchdog (timer base is 8ms, prescaler sets up timeout /128 = ~1s)
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P0_WDTCR = 0x87; // enable watchdog ~1s
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P0_WDTKEY = 0x4e; // reset watchdog
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// P0_WDTCR = 0x87; // enable watchdog ~1s
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// P0_WDTKEY = 0x4e; // reset watchdog
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// P0_WDTCR = 0x07; // disable watchdog ~1s
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// P0_WDTKEY = 0xb1; // disable watchdog
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P0_WDTCR = 0x07; // disable watchdog ~1s
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P0_WDTKEY = 0xb1; // disable watchdog
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// power down unused peripherlas
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P0_DEVPD1 |= BIT(6) | BIT(5) | BIT(3) | BIT(1); // PWM A, timer 3, SPI, LVD
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@ -342,13 +394,59 @@ void main(void)
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i2c_slave_init();
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// enable interrupts
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EA = 1;
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T1_SET_TIMEOUT(40000);
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// enable interrupts
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ET1 = 1;
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EA = 1;
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ext_int_deassert();
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#if POLL_INPUT
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keyscan_active();
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#else
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keyscan_idle();
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#endif
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uint8_t asserted = 0;
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//uint16_t ticks = 0;
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while (1) {
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if (!run_tasks) {
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// power down
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//PCON |= BIT(1);
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// go to idle CPU mode when there's nothing to do
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//PCON |= BIT(0);
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__asm__("nop");
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continue;
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}
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//ticks++;
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run_tasks = 0;
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#if POLL_INPUT
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// every 10ms we will scan the keyboard keys state and check for changes
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uint8_t keys[12];
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uint8_t active_rows = keyscan_scan(keys);
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if (active_rows) {
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// pressing FN+PINE+F switches to flashing mode (keys 1:2 3:5 5:2, electrically)
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if (keys[0] & BIT(2) && keys[2] & BIT(5) && keys[4] & BIT(2)) {
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EA = 0;
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__asm__("mov r6,#0x5a");
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__asm__("mov r7,#0xe7");
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__asm__("ljmp 0x0118");
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}
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// check for changes
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if (!memcmp(i2c_regs + 4, keys, 12))
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continue;
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// signal interrupt
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memcpy(i2c_regs + 4, keys, 12);
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ext_int_assert();
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delay_us(100);
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ext_int_deassert();
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}
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#else
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if (scan_active) {
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uint8_t active_rows = keyscan_scan(i2c_regs + 4);
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if (!active_rows) {
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@ -360,6 +458,7 @@ void main(void)
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//__asm__("nop");
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}
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// pressing FN+PINE+F switches to flashing mode (keys 1:2 3:5 5:2, electrically)
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if (i2c_regs[4 + 0] & BIT(2) && i2c_regs[4 + 2] & BIT(5) && i2c_regs[4 + 4] & BIT(2)) {
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EA = 0;
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__asm__("mov r6,#0x5a");
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@ -374,5 +473,6 @@ void main(void)
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scan_active = 1;
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keyscan_active();
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}
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#endif
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}
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}
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