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pinephone-keyboard/firmware/main.c
Ondrej Jirman 04ca071b09 Fixup/document I2C
2021-06-19 02:51:23 +02:00

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/**
* Pinephone Keyboard Firmware
*
* Copyright (C) 2021 Ondřej Jirman <megi@xff.cz>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#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))
// 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; \
TH0 = (0x10000u - 2 * n) >> 8; \
TL0 = (0x10000u - 2 * n) & 0xff; \
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;
}
// {{{ Debug logging
static uint8_t __xdata log_buffer[1024];
// end = start => empty buffer
// end can never equal start on a filled buffer
// end points to the last char if end != start
static uint16_t log_start = 0;
static uint16_t log_end = 0;
static void putc(char c)
{
log_end = (log_end + 1) % 1024;
if (log_end == log_start) {
// overflow, just push the start in front of us
log_start = (log_start + 1) % 1024;
}
log_buffer[log_end] = c;
}
static void puts(const char* s)
{
while (*s)
putc(*s++);
}
static void put_uint(uint16_t value)
{
char buf[6];
char *p = &buf[6 - 1];
*p = '\0';
if (!value)
*--p = '0';
while (value) {
*--p = '0' + value % 10;
value /= 10;
}
puts(p);
}
static void put_hex_n(uint8_t nibble)
{
char c;
nibble &= 0xf;
if (nibble < 10)
c = '0' + nibble;
else
c = 'a' + (nibble - 10);
putc(c);
}
static void put_hex_b(uint8_t hex)
{
put_hex_n(hex >> 4);
put_hex_n(hex);
}
static void put_hex_w(uint16_t hex)
{
put_hex_b(hex >> 8);
put_hex_b(hex);
}
// }}}
// {{{ Key scanning
// Keyboard has 12 columns and 6 rows directly connected to GPIOs.
//
// C1 P95
// C2 P96
// C3 P97
// C4 P50
// C5 P51
// C6 P52
// C7 P53
// C8 P54
// C9 P55
// C10 P56
// C11 P57
// C12 P80 (also USB IAP trigger when pulled low)
//
// R1 P60
// R2 P61
// R3 P62
// R4 P63
// R5 P64
// R6 P65
//
// INT P90
// SCL P92
// SDA P93
//
// We will want to keep keyboard controller asleep unless some key is
// pressed. If a key is pressed, the controller will continuously scan
// for further pressed keys. When all keys are released, the controller
// can go back to sleep.
//
// For this to work, we'll use port 6 ability to wake up the controller
// on change.
//
// During sleep:
// - all columns will be set to low state
// - all rows will have pull-up enabled
// - when user presses any key, row state will change to low and
// the controller will wake up
//
// During active state:
// - all columns will be put to hi-Z state, except for the currently
// scanned one, which will be in low state
// - state of rows will be read, and will indicate state of keys
// in the selected column (0 = pressed, 1 = not pressed)
//
// De-bouncing:
// - scanning will happen in 5ms intervals and only if the two
// consecutive scans match, will the result be considered valid
//
// Configure GPIO for keyboard key scanning
//
// Switch to idle state
//
// In this state we can use keyscan_idle_is_pressed() to detect whether
// any key is pressed, and switch to active mode via keyscan_active().
//
void keyscan_idle(void)
{
// enable output low on all columns (P9[7:5] P5[7:0] P8[0])
PAGESW = 0;
P5 = 0;
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 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)
{
return ~P6 & 0x3f;
}
//
// Switch to active mode.
//
// In this state, we can call keyscan_scan() to perform a scan.
//
void keyscan_active(void)
{
// put all columns to hi-Z (P9[7:5] P5[7:0] P8[0])
// disable input change interrupt
ICIE = 0;
PAGESW = 0;
P5 = 0;
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: 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)
{
uint8_t pin, mask = 0, row;
// for each column:
// - output low on column
// - wait (for voltage to stabilize)
// - read rows
// - turn column back to hi-Z
PAGESW = 1;
for (pin = 5; pin <= 7; pin++) {
P1_P9M0 &= ~BIT(pin);
delay_us(3);
row = ~P6 & 0x3f;
mask |= row;
*res++ = row;
P1_P9M0 |= BIT(pin);
}
PAGESW = 0;
for (pin = 0; pin <= 7; pin++) {
P0_P5M0 &= ~BIT(pin);
delay_us(3);
row = ~P6 & 0x3f;
mask |= row;
*res++ = row;
P0_P5M0 |= BIT(pin);
}
P0_P8M0 &= ~BIT(0);
delay_us(3);
row = ~P6 & 0x3f;
mask |= row;
*res++ = row;
P0_P8M0 |= BIT(0);
return mask;
}
void ext_int_assert(void)
{
P90 = 0;
PAGESW = 1;
P1_P9M0 &= ~BIT(0);
}
void ext_int_deassert(void)
{
P90 = 0;
PAGESW = 1;
P1_P9M0 |= BIT(0);
}
// }}}
// {{{ I2C
#define I2C_N_REGS 16
static uint8_t i2c_rx_cnt = 0;
static uint8_t i2c_tx_cnt = 0;
static uint8_t i2c_tx_buf[I2C_N_REGS] = {0xaa, 0x55};
static uint8_t i2c_rx_buf[I2C_N_REGS];
/*
* Host write transaction: sending 01 02 03 04 to device at 0x15 (0x2a == 0x15 << 1)
*
* int=60 CR1=8c CR2=af DATA_PRE=2a rx
* int=60 CR1=8e CR2=af DATA_PRE=01 rx
* int=60 CR1=8e CR2=af DATA_PRE=02 rx
* int=60 CR1=8e CR2=af DATA_PRE=03 rx
* int=60 CR1=8e CR2=af DATA_PRE=04 rx
* int=70 CR1=0c CR2=2f DATA_PRE=04 stop
*
* Host read transaction: receiving 4 bytes
*
* int=a0 CR1=8d CR2=af tx
* int=a0 CR1=8d CR2=af tx
* int=a0 CR1=8d CR2=af tx
* int=a0 CR1=89 CR2=af tx
* int=b0 CR1=08 CR2=2f stop
*
* CR1:
* 7: STROBE/PEND (RX/TX: not set on stop IRQ, even though RXSF/TXSF is also set)
* 3: SAR_EMPTY (RX/TX: always set)
* 2: ACK (RX: always set)
* (TX: set on all except on the last TX byte)
* 1: FULL (RX: not set on first RX byte, which is a device address)
* (TX: always not set)
* 0: EMPTY (RX: always not set)
* (TX: alwyas set except after stop IRQ)
*
* CR2:
* 7: I2C busy flag (RX/TX: not set after stop IRQ)
* 6: ?
* 5: SW_RESET
* 4: BBF
*
* I2CBINT:
* 7: TXSF
* 6: RXSF
* 5: STP_IEN
* 4: STOPF
*
* Powerdown is only possible after the stop bit. Wakeup only happens
* on address match.
*/
#define I2C_ADDR 0x15
#define I2C_DEBUG 0
void i2c_b_interupt(void) __interrupt(IRQ_I2CB)
{
uint8_t saved_page = PAGESW;
PAGESW = 0;
#if I2C_DEBUG
puts("i2cb int=");
put_hex_b(P0_I2CBINT);
puts(" CR1=");
put_hex_b(P0_I2CBCR1);
puts(" CR2=");
put_hex_b(P0_I2CBCR2);
puts("\n");
#endif
// handle stop condition
if (P0_I2CBINT & BIT(4)) {
if (i2c_rx_cnt) {
//XXX: process received data
puts("I2C RX: ");
for (uint8_t i = 0; i < i2c_rx_cnt; i++)
put_hex_b(i2c_rx_buf[i]);
puts("\n");
}
i2c_tx_cnt = 0;
i2c_rx_cnt = 0;
goto out_ack;
}
// handle TX
if (P0_I2CBINT & BIT(7)) {
if (i2c_tx_cnt < I2C_N_REGS)
P0_I2CBDB = i2c_tx_buf[i2c_tx_cnt++];
else
P0_I2CBDB = 0xff;
goto out_ack;
}
// handle RX
if (P0_I2CBINT & BIT(6)) {
uint8_t empty = P0_I2CBCR1 & BIT(1);
uint8_t tmp = P0_I2CBDB;
if (empty && i2c_rx_cnt < I2C_N_REGS)
i2c_rx_buf[i2c_rx_cnt++] = tmp;
goto out_ack;
}
out_ack:
P0_I2CBINT &= ~(BIT(4) | BIT(7) | BIT(6));
P0_I2CBCR1 &= ~BIT(7); // clear data pending
PAGESW = saved_page;
}
//
// Slave mode I2C for communication with the SoC
//
// - address is 0x15
// - 400kHz
// - interrupts are used to handle tx/rx/end of transaction (stop bit)
//
void i2c_slave_init(void)
{
PAGESW = 0;
// setup I2C B for slave mode
//P0_I2CBCR1 = 0x20;
//P0_I2CBCR2 = 0x07 << 1 | 0x01; // 400kHz mode, enable I2C B controller, enable
P0_I2CBCR1 = 0x00;
P0_I2CBCR2 = 0x07 << 1 | BIT(0); // 100kHz mode, enable I2C B controller, enable
// setup I2C address
P0_I2CBDAH = 0x00;
P0_I2CBDAL = I2C_ADDR;
P0_I2CBINT = BIT(5); // enable I2C B stop interrupt
P0_EIE3 |= BIT(5); // enable I2C B interrupt
}
// }}}
// {{{ USB
enum {
UDC_EP_CONTROL = 0,
UDC_EP_ISO,
UDC_EP_BULK,
UDC_EP_INTERRUPT,
};
#define UDC_EP_CONF(conf, intf, alt, type) \
(conf << 6) | (intf << 4) | (alt << 2) | type
#define UDC_EP_OUT_CONF(ep1, ep2, ep3, ep4) \
ep4 | (ep3 << 2) | (ep2 << 4) | (ep1 << 6)
static const uint8_t udc_config[5] = {
UDC_EP_CONF(1, 0, 0, UDC_EP_INTERRUPT),
UDC_EP_CONF(1, 0, 0, UDC_EP_INTERRUPT),
UDC_EP_CONF(1, 0, 0, UDC_EP_INTERRUPT),
UDC_EP_CONF(1, 0, 0, UDC_EP_INTERRUPT),
UDC_EP_OUT_CONF(UDC_EP_INTERRUPT, UDC_EP_INTERRUPT, UDC_EP_INTERRUPT, UDC_EP_INTERRUPT),
};
static void usb_disable(void)
{
// reset phy/usb
PAGESW = 1;
P1_PHYTEST0 &= ~BIT(6); // phy disable
P1_UDCCTRL &= ~BIT(6); // udc disable
}
static void usb_init(void)
{
PAGESW = 1;
P1_UDCCTRL |= BIT(6); // udc enable
// wait for UDC to complete initialization
while (!(P1_UDCCTRL & BIT(1)));
__asm__("nop");
// setup USB EP depths
P1_UDCEP1BUFDEPTH = 64 - 1;
P1_UDCEP2BUFDEPTH = 64 - 1;
P1_UDCEP3BUFDEPTH = 64 - 1;
P1_UDCEP4BUFDEPTH = 64 - 1;
__asm__("nop");
__asm__("nop");
// configure UDC
for (uint8_t i = 0; i < 4; i++) {
P1_UDCCFDATA = udc_config[i];
while (!(P1_UDCCFSTA & BIT(7)));
while (P1_UDCCFSTA & BIT(7));
}
P1_UDCCFDATA = udc_config[4];
while (!(P1_UDCCFSTA & BIT(6)));
// enable USB
P1_USBCTRL |= BIT(6);
P1_UDCINT0EN = 0;
P1_UDCINT1EN = 0;
P1_UDCINT2EN = 0;
P1_UDCEPCTRL = 0xf;
P1_UDCINT0STA = 0;
P1_UDCINT1STA = 0;
P1_UDCINT2STA = 0;
// enable phy
P1_PHYTEST0 |= BIT(5) | BIT(6);
__asm__("nop");
__asm__("nop");
PAGESW = 0;
}
#define USB_ID(w) (uint16_t)w & 0xff, ((uint16_t)w >> 8)
#define USB_BCD(a, b) b, a
static const uint8_t usb_desc_device[] ={
18, // bLength
1, // bDescriptorType
USB_BCD(0x2, 0x0), // bcdUSB
0xff, // bDeviceClass
0, // bDeviceSubClass
0xff, // bDeviceProtocol
64, // bMaxPacketSize0
USB_ID(0x04f3), // idVendor
USB_ID(0xb001), // idProduct
USB_BCD(0x1, 0x0), // bcdDevice
1, // iManfacturer
2, // iProduct
0, // iSerialNumber
1, // bNumConfgurations
};
#define USB_EP_OUT(addr, attr, maxsize, interval) \
7, 5, addr, attr, USB_ID(maxsize), interval
#define USB_EP_IN(addr, attr, maxsize, interval) \
USB_EP_OUT((addr) | 0x80, attr, maxsize, interval)
static const uint8_t usb_desc_config[] = {
9, // bLength
2, // bDescriptorType
USB_ID(sizeof(usb_desc_config)),// bTotolLength
1, // bNumInterfaces
1, // bConfigurationValue
0, // iConfiguration string index
BIT(7) // must be set // bmAttributes
| BIT(6) // self power
| BIT(5) // remote wakeup
,
100, // bMaxPower
// Interface 0
9, // bLength
4, // bDescriptorType
0, // bInterfaceNumber
0, // bAlternateSetting
4, // bNumEndpoints
0xff, // bInterfaceClass
0, // bInterfaceSubClass
0xff, // bInterfaceProtocol
0, // iInterface
USB_EP_OUT(1, 3, 64, 1), // request
USB_EP_IN(2, 3, 64, 1), // response
USB_EP_IN(3, 3, 64, 1), // debug logging output
USB_EP_IN(4, 3, 64, 1), // key status changes
};
static const uint8_t usb_string_lang[] = {
4, 3,
USB_ID(0x0409),
};
static const uint8_t usb_string_manufacturer[] = {
4 * 2 + 2,
3,
'm', 0,
'e', 0,
'g', 0,
'i', 0,
};
static const uint8_t usb_string_product[] = {
5 * 2 + 2,
3,
'd', 0,
'e', 0,
'b', 0,
'u', 0,
'g', 0,
};
static const uint8_t * const usb_strings[] = {
usb_string_lang,
usb_string_manufacturer,
usb_string_product,
};
static uint16_t usb_ep0_in_remaining;
static uint8_t const* usb_ep0_in_ptr;
static uint8_t usb_command_status = 0;
static uint8_t usb_key_change = 0;
static uint8_t usb_command[8];
static uint8_t usb_response[8];
static void usb_tasks(void)
{
uint8_t buf[8];
PAGESW = 1;
// handle reset request
if (P1_UDCINT0STA & BIT(5)) {
P1_USBCTRL |= BIT(5);
P1_USBCTRL &= ~BIT(5);
// clear EP0-3 buffers
P1_UDCEPBUF0CTRL |= 0x55u;
P1_UDCEPBUF0CTRL &= ~0x55u;
// clear EP4
P1_UDCEPBUF1CTRL |= BIT(0);
P1_UDCEPBUF1CTRL &= ~BIT(0);
// clear EP0 / EP1 in buffers
P1_UDCBUFSTA &= ~(BIT(0) | BIT(1));
//XXX: what about others?
//XXX: reset software variables...
EA = 0;
puts("usb reset int\n");
EA = 1;
// ack reset request
P1_UDCINT0STA &= ~BIT(5);
}
// ep0 setup request received
if (P1_UDCINT0STA & BIT(1)) {
// buf: bReqType bReq wVal(l/h) wIndex wLength
for (uint8_t i = 0; i < 8; i++)
buf[i] = P1_UDCEP0BUFDATA;
// how much data to send to ep0 in
usb_ep0_in_remaining = (uint16_t)((buf[7] << 8) | buf[6]);
uint16_t in0_len = 0;
// standard commands
if (buf[0] == 0x80) {
// GET_DESCRIPTOR
if (buf[1] == 0x06) {
if (buf[3] == 1) {
// device desc: 80 06 00 01 00 00
if (buf[2] == 0) {
usb_ep0_in_ptr = usb_desc_device;
in0_len = sizeof(usb_desc_device);
goto ack_ep0_setup;
}
} else if (buf[3] == 2) {
// cfg desc: 80 06 00 02 00 00
if (buf[2] == 0) {
usb_ep0_in_ptr = usb_desc_config;
in0_len = sizeof(usb_desc_config);
goto ack_ep0_setup;
}
} else if (buf[3] == 3) {
// string desc: 80 06 str_index 03 00 00
if (buf[2] < sizeof(usb_strings) / sizeof(usb_strings[0])) {
usb_ep0_in_ptr = usb_strings[buf[2]];
in0_len = usb_ep0_in_ptr[0];
goto ack_ep0_setup;
}
}
}
}
usb_ep0_in_remaining = 0;
P1_UDCCTRL |= BIT(4); // stall control endpoint req
ack_ep0_setup:
if (in0_len < usb_ep0_in_remaining)
usb_ep0_in_remaining = in0_len;
// ack
P1_UDCINT0STA &= ~BIT(1);
}
// USB host initiated EP0 IN transfer
if (P1_UDCINT1STA & BIT(0)) {
// check if we're ready to send to ep0
if (!(P1_UDCEPBUF0CTRL & BIT(1))) {
// if ep0 in buffer not empty, clear it first
if (!(P1_UDCBUFSTA & BIT(0))) {
// clear ep0 buffer
P1_UDCEPBUF0CTRL |= BIT(0);
P1_UDCEPBUF0CTRL &= ~BIT(0);
}
for (uint8_t n = 0; n < 64; n++) {
// push data to EP0 in (max 8 bytes)
if (usb_ep0_in_remaining > 0) {
usb_ep0_in_remaining--;
P1_UDCEP0BUFDATA = *usb_ep0_in_ptr++;
} else {
break;
}
}
// confirm sending data
P1_UDCEPBUF0CTRL |= BIT(1);
// ack interrupt
P1_UDCINT1STA &= ~BIT(0);
}
}
// data received on ep0 out
if (P1_UDCINT1STA & BIT(1)) {
// we don't handle any control transfers that send us data
EA = 0;
puts("usb EP0 OUT int\n");
EA = 1;
// reset ep0 buf
P1_UDCEPBUF0CTRL |= BIT(0);
P1_UDCEPBUF0CTRL &= ~BIT(0);
// ack interrupt
P1_UDCINT1STA &= ~BIT(1);
}
// does not happen, EP1 IN is not configured on host
if (P1_UDCINT1STA & BIT(2)) {
P1_UDCINT1STA &= ~BIT(2);
}
// data received on ep1 out (command endpoint)
if (P1_UDCINT1STA & BIT(3)) {
// read data from ep1 fifo
uint8_t bytes = P1_UDCEP1DATAOUTCNT + 1;
for (uint8_t i = 0; i < 8; i++)
usb_command[i] = P1_UDCEP1BUFDATA;
usb_command_status = 1;
P1_UDCINT1STA &= ~BIT(3);
// clear the rest
P1_UDCEPBUF0CTRL |= BIT(2);
P1_UDCEPBUF0CTRL &= ~BIT(2);
//do {
//P1_USBCTRL |= BIT(6);
//} while(!(P1_USBCTRL & BIT(6)));
}
// process USB commands
if (usb_command_status == 1) {
// what command the response is for
usb_response[0] = usb_command[0];
// success = 0, error code otherwise
usb_response[1] = 0x00;
if (usb_command[0] == 0x01) {
// bootloader mode
EA = 0;
__asm__("mov r6,#0x5a");
__asm__("mov r7,#0xe7");
__asm__("ljmp 0x0118");
} else {
// command unknown
usb_response[1] = 1;
}
usb_command_status = 2;
}
// USB host initiated EP2 IN transfer
if (P1_UDCINT1STA & BIT(4)) {
// send out response to last command on ep2 in
if (usb_command_status == 2 && !(P1_UDCEPBUF0CTRL & BIT(5))) {
P1_UDCEP2DATAINCNT = 8 - 1; // how much bytes to send
for (uint8_t i = 0; i < 8; i++)
P1_UDCEP2BUFDATA = usb_response[i];
P1_UDCEPBUF0CTRL |= BIT(5); // EP2 data ready
usb_command_status = 0;
}
// ack
P1_UDCINT1STA &= ~BIT(4);
}
// USB host initiated EP3 IN transfer
if (P1_UDCINT1STA & BIT(6)) {
// push printf debug buffer to ep3 in
if (!(P1_UDCEPBUF0CTRL & BIT(7)) && log_start != log_end) {
uint8_t cnt = 0;
while (cnt < 64 && log_start != log_end) {
log_start = (log_start + 1) % 1024;
P1_UDCEP3BUFDATA = log_buffer[log_start]; // push data to fifo
cnt++;
}
P1_UDCEP3DATAINCNT = cnt - 1;
P1_UDCEPBUF0CTRL |= BIT(7); // EP3 data ready
}
// ack
P1_UDCINT1STA &= ~BIT(6);
}
// USB host initiated EP4 IN transfer
if (P1_UDCINT2STA & BIT(2)) {
// push key change events to ep4 in
if (!(P1_UDCEPBUF1CTRL & BIT(1)) && usb_key_change) {
for (uint8_t i = 0; i < 12; i++)
P1_UDCEP4BUFDATA = i2c_tx_buf[i + 4];
P1_UDCEP4DATAINCNT = 12 - 1;
P1_UDCEPBUF1CTRL |= BIT(1); // EP4 data ready
usb_key_change = 0;
}
// ack
P1_UDCINT2STA &= ~BIT(2);
}
// suspend request
if (P1_UDCINT0STA & BIT(6)) {
EA = 0;
puts("usb suspend int\n");
EA = 1;
// ack
P1_UDCINT0STA &= ~BIT(6);
//XXX: handle suspend properly
// suspend UDC
P1_UDCCTRL &= ~BIT(5);
}
}
void main(void)
{
uint8_t scan_active = 0;
PAGESW = 0;
// setup interrupts
EA = 0;
IE = 0;
P0_EIE1 = 0;
P0_EIE2 = 0;
P0_EIE3 = 0;
// set CPU clock to normal (high frequency) mode
// [7] = power down HS clock in low speed mode - 1: yes 0: no
// [2:1] = high speed clock pre-divider - 1: /4 2: /2 3: /1
// [0] = cpu clock mode 1: high speed mode 0: low speed mode
CKCON1 = (CKCON1 & ~0x87u) | 0x07; // 0x87
// set timer 1 and timer 0 clock source to sysclk/12 (2 MHz)
CKCON0 = 0x00;
// wait until high speed clock is stable
while (!(CKCON0 & BIT(1)));
// set both timers to 16-bit counter modes
TMOD = 0x11;
// 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 = 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
P0_DEVPD2 |= BIT(6) | BIT(3) | BIT(0); // PWM C, PWM B, I2C A
P0_DEVPD3 |= BIT(2) | BIT(1) | BIT(0); // PWM E, PWM D, PWM F
// keep UART, SPI, and I2C A in reset
//P0_PRST |= BIT(0) | BIT(2) | BIT(3);
// enable pullups only all port 6 pins and make those pins into input
PAGESW = 0;
P0_PHCON0 = 0x00;
P0_PHCON1 = 0xff; // port 6 pull-up enable
P0_P6M0 = 0xff; // port 6 input
PAGESW = 1;
P1_PHCON2 = 0x00;
// enable auto-tuning internal RC oscillator based on USB SOF packets
P1_IRCCTRL &= ~BIT(1); // disable manual trim
puts("ppkb firmware 0.1\n");
i2c_slave_init();
T1_SET_TIMEOUT(40000);
usb_disable();
// enable interrupts
ET1 = 1;
EA = 1;
ext_int_deassert();
#if POLL_INPUT
keyscan_active();
#else
keyscan_idle();
#endif
uint8_t asserted = 0;
uint8_t usb_initialized = 0;
uint16_t ticks = 0;
while (1) {
if (usb_initialized)
usb_tasks();
if (!run_tasks) {
// power down (timers don't work in power-down)
//PCON |= BIT(1);
// go to idle CPU mode when there's nothing to do (doesn't help much)
// switching to LOSC may work better
//PCON |= BIT(0);
__asm__("nop");
continue;
}
ticks++;
run_tasks = 0;
// usb init needs to run after 500ms
if (ticks > 500 / 20 && !usb_initialized) {
usb_init();
usb_initialized = 1;
}
#if POLL_INPUT
// every 20ms we will scan the keyboard keys state and check for changes
uint8_t keys[12];
uint8_t active_rows = keyscan_scan(keys);
// 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_tx_buf + 4, keys, 12))
continue;
// signal interrupt
memcpy(i2c_tx_buf + 4, keys, 12);
ext_int_assert();
delay_us(100);
ext_int_deassert();
usb_key_change = 1;
#else
//XXX: not figured out yet, not tested, not working
if (scan_active) {
uint8_t active_rows = keyscan_scan(i2c_tx_buf + 4);
if (!active_rows) {
scan_active = 0;
keyscan_idle();
// power down
//PCON |= BIT(1);
//__asm__("nop");
}
// pressing FN+PINE+F switches to flashing mode (keys 1:2 3:5 5:2, electrically)
if (i2c_tx_buf[4 + 0] & BIT(2) && i2c_tx_buf[4 + 2] & BIT(5) && i2c_tx_buf[4 + 4] & BIT(2)) {
EA = 0;
__asm__("mov r6,#0x5a");
__asm__("mov r7,#0xe7");
__asm__("ljmp 0x0118");
}
continue;
}
if (keyscan_idle_is_pressed()) {
scan_active = 1;
keyscan_active();
}
#endif
}
}
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