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Implement polled mode and key bitmap change signalling via external interrupt

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- this firmware consumes about 4-5 mA (can be probably made lower)
This commit is contained in:
Ondrej Jirman 2021-06-16 14:09:25 +02:00
parent a9bb6a3691
commit bca8c47f46
1 changed files with 122 additions and 22 deletions
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144
firmware/main.c
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@ -18,23 +18,28 @@
*/
#include <stdint.h>
#include <string.h>
#include <em85f684a.h>
// configuration (we can make this runtime configurable via i2c)
// polled input mode is necessary if some rows are always on
#define POLL_INPUT 1
#define BIT(n) (1u << (n))
// we just use this interrupt for wakeup from sleep on input change
void pinchange_interupt(void) __interrupt(IRQ_PINCHANGE)
{
// disable all input change interrupts
P0_ICEN = BIT(5);
}
// timers clock is 2 MHz so we need to wait for 2000 ticks to get delay of 1ms
#define T0_SET_TIMEOUT(n) { \
TL0 = 0x00; \
TH0 = (0x10000u - n) >> 8; \
TL0 = (0x10000u - n) & 0xff; \
}
#define T1_SET_TIMEOUT(n) { \
TL1 = 0x00; \
TH1 = (0x10000u - n) >> 8; \
TL1 = (0x10000u - n) & 0xff; \
}
#define delay_us(n) { \
TL0 = 0x00; \
TF0 = 0; \
@ -43,6 +48,38 @@ void pinchange_interupt(void) __interrupt(IRQ_PINCHANGE)
while (!TF0); \
}
static __sbit p6_changed = 0;
static __sbit run_tasks = 0;
// we use this interrupt for wakeup from sleep on input change
void pinchange_interupt(void) __interrupt(IRQ_PINCHANGE)
{
uint8_t saved_page = PAGESW;
PAGESW = 0;
if (P0_ICEN & BIT(1))
p6_changed = 1;
// clear input change flags
P0_ICEN = BIT(5);
PAGESW = saved_page;
}
// we use this interrupt as a scheduling tick (wakeup from sleep)
void timer1_interupt(void) __interrupt(IRQ_TIMER1)
{
run_tasks = 1;
// 20 ms
T1_SET_TIMEOUT(40000);
TF1 = 0;
}
// Keyboard has 12 columns and 6 rows directly connected to GPIOs.
//
// C1 P95
@ -111,14 +148,29 @@ void keyscan_idle(void)
P8 &= 0xfe;
P9 &= 0x1f;
#if POLL_INPUT
// make all columns an input, hi-Z (saves power)
P0_P5M0 = ~0x00u;
P0_P8M0 |= ~0xfeu;
PAGESW = 1;
P1_P9M0 |= ~0x1fu;
ICIE = 0;
p6_changed = 0;
#else
P0_P5M0 = 0x00;
P0_P8M0 &= 0xfe;
PAGESW = 1;
P1_P9M0 &= 0x1f;
// enable input change interrupt on port6 and clear the flag
// enable input change interrupt on port6 and clear the interrupt flag after
// things stabilize
delay_us(10);
PAGESW = 0;
p6_changed = 0;
P0_ICEN = BIT(5);
ICIE = 1;
#endif
}
uint8_t keyscan_idle_is_pressed(void)
@ -144,13 +196,16 @@ void keyscan_active(void)
P8 &= 0xfe;
P9 &= 0x1f;
// make all columns an input (hi-Z) in preparation for individual
// column scanning
P0_P5M0 = ~0x00u;
P0_P8M0 |= ~0xfeu;
PAGESW = 1;
P1_P9M0 |= ~0x1fu;
}
// XXX: we can debounce in the scan function too (3us?)
// XXX: do we need to debounce in the scan function?
// XXX: it looks like that there should be no bouncing going on mechanically
// 12 byte storage required
uint8_t keyscan_scan(uint8_t* res)
@ -166,7 +221,7 @@ uint8_t keyscan_scan(uint8_t* res)
PAGESW = 1;
for (pin = 5; pin <= 7; pin++) {
P1_P9M0 &= ~BIT(pin);
delay_us(10);
delay_us(3);
row = ~P6 & 0x3f;
mask |= row;
*res++ = row;
@ -176,7 +231,7 @@ uint8_t keyscan_scan(uint8_t* res)
PAGESW = 0;
for (pin = 0; pin <= 7; pin++) {
P0_P5M0 &= ~BIT(pin);
delay_us(10);
delay_us(3);
row = ~P6 & 0x3f;
mask |= row;
*res++ = row;
@ -184,7 +239,7 @@ uint8_t keyscan_scan(uint8_t* res)
}
P0_P8M0 &= ~BIT(0);
delay_us(10);
delay_us(3);
row = ~P6 & 0x3f;
mask |= row;
*res++ = row;
@ -308,18 +363,15 @@ void main(void)
// set both timers to 16-bit counter modes
TMOD = 0x11;
// timers clock is 2 MHz so we need to wait for 2000 ticks to get delay of 1ms
//T0_SET_TIMEOUT(2000);
// enable both timers
TCON = 0x50;
// setup watchdog (timer base is 8ms, prescaler sets up timeout /128 = ~1s)
P0_WDTCR = 0x87; // enable watchdog ~1s
P0_WDTKEY = 0x4e; // reset watchdog
// P0_WDTCR = 0x87; // enable watchdog ~1s
// P0_WDTKEY = 0x4e; // reset watchdog
// P0_WDTCR = 0x07; // disable watchdog ~1s
// P0_WDTKEY = 0xb1; // disable watchdog
P0_WDTCR = 0x07; // disable watchdog ~1s
P0_WDTKEY = 0xb1; // disable watchdog
// power down unused peripherlas
P0_DEVPD1 |= BIT(6) | BIT(5) | BIT(3) | BIT(1); // PWM A, timer 3, SPI, LVD
@ -342,13 +394,59 @@ void main(void)
i2c_slave_init();
// enable interrupts
EA = 1;
T1_SET_TIMEOUT(40000);
// enable interrupts
ET1 = 1;
EA = 1;
ext_int_deassert();
#if POLL_INPUT
keyscan_active();
#else
keyscan_idle();
#endif
uint8_t asserted = 0;
//uint16_t ticks = 0;
while (1) {
if (!run_tasks) {
// power down
//PCON |= BIT(1);
// go to idle CPU mode when there's nothing to do
//PCON |= BIT(0);
__asm__("nop");
continue;
}
//ticks++;
run_tasks = 0;
#if POLL_INPUT
// every 10ms we will scan the keyboard keys state and check for changes
uint8_t keys[12];
uint8_t active_rows = keyscan_scan(keys);
if (active_rows) {
// pressing FN+PINE+F switches to flashing mode (keys 1:2 3:5 5:2, electrically)
if (keys[0] & BIT(2) && keys[2] & BIT(5) && keys[4] & BIT(2)) {
EA = 0;
__asm__("mov r6,#0x5a");
__asm__("mov r7,#0xe7");
__asm__("ljmp 0x0118");
}
// check for changes
if (!memcmp(i2c_regs + 4, keys, 12))
continue;
// signal interrupt
memcpy(i2c_regs + 4, keys, 12);
ext_int_assert();
delay_us(100);
ext_int_deassert();
}
#else
if (scan_active) {
uint8_t active_rows = keyscan_scan(i2c_regs + 4);
if (!active_rows) {
@ -360,6 +458,7 @@ void main(void)
//__asm__("nop");
}
// pressing FN+PINE+F switches to flashing mode (keys 1:2 3:5 5:2, electrically)
if (i2c_regs[4 + 0] & BIT(2) && i2c_regs[4 + 2] & BIT(5) && i2c_regs[4 + 4] & BIT(2)) {
EA = 0;
__asm__("mov r6,#0x5a");
@ -374,5 +473,6 @@ void main(void)
scan_active = 1;
keyscan_active();
}
#endif
}
}