mirror of
https://github.com/qmk/qmk_firmware.git
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2d14d12c74
* is_master, has_usb() move to rev2.[hc] * Do recent helix/rev2 changes to helix/pico as well. helix/pico/matrix.c: remove 'is_master' helix/pico/pico.c: add 'is_master' helix/pico/pico.h: add 'has_usb()' macro helix/pico/split_util.c: remove 'setup_handedness()' 'has_usb()', add 'is_helix_master()' etc * add HELIX=scan option into {rev2/pico}/local_features.mk Made DEBUG_MATRIX_SCAN_RATE easy to use. * Changed rules.mk to link "helix/local_drivers/ssd1306.c" only when OLED_ENABLE = yes. * Added option to use split_common for helix/rev2, helix/pico keyboard. how to build: ### build helix/pico (HelixPico) with helix current codes $ make helix/pico:KEY_MAP $ make helix/pico/back:KEY_MAP ### build helix/rev2 (Helix or Helix beta) with helix current codes $ make helix:KEY_MAP $ make helix/rev2/back:KEY_MAP $ make helix/rev2/under:KEY_MAP $ make helix/rev2/oled:KEY_MAP $ make helix/rev2/oled/back:KEY_MAP $ make helix/rev2/oled/under:KEY_MAP ### build helix/pico (HelixPico) with split_common codes $ make helix/pico/sc:KEY_MAP $ make helix/pico/sc/back:KEY_MAP $ make helix/pico/sc/under:KEY_MAP ### build helix/rev2 (Helix) with split_common codes $ make helix/rev2/sc:KEY_MAP $ make helix/rev2/sc/back:KEY_MAP $ make helix/rev2/sc/under:KEY_MAP $ make helix/rev2/sc/oled:KEY_MAP $ make helix/rev2/sc/oledback:KEY_MAP $ make helix/rev2/sc/oledunder:KEY_MAP * add matrix_slave_scan_user() to helix/rev2/rev2.c, helix/pico/pico.h * Changed 'helix:xulkal' to always use split_common and removed ad hoc code. Added the following line to 'helix/rev2/keymaps/xulkal/rules.mk': SPLIT_KEYBOARD = yes Removed the following ad hoc code from 'users/xulkal/custom_oled.c': #if KEYBOARD_helix_rev2 extern uint8_t is_master; bool is_keyboard_master(void) { return is_master; } #endif * add '#define DIODE_DIRECTION COL2ROW' into helix/{rev2|pico}/config.h This commit does not change the build result. * update helix readme * keyboards/helix/readme.md * keyboards/helix/pico/keymaps/default/readme.md * keyboards/helix/rev2/keymaps/default/readme.md Co-authored-by: mtei <2170248+mtei@users.noreply.github.com>
160 lines
4.3 KiB
C
160 lines
4.3 KiB
C
#include <util/twi.h>
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#include <avr/io.h>
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#include <stdlib.h>
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#include <avr/interrupt.h>
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#include <util/twi.h>
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#include <stdbool.h>
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#include "i2c.h"
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// Limits the amount of we wait for any one i2c transaction.
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// Since were running SCL line 100kHz (=> 10μs/bit), and each transactions is
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// 9 bits, a single transaction will take around 90μs to complete.
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//
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// (F_CPU/SCL_CLOCK) => # of μC cycles to transfer a bit
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// poll loop takes at least 8 clock cycles to execute
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#define I2C_LOOP_TIMEOUT (9+1)*(F_CPU/SCL_CLOCK)/8
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#define BUFFER_POS_INC() (slave_buffer_pos = (slave_buffer_pos+1)%SLAVE_BUFFER_SIZE)
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volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
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static volatile uint8_t slave_buffer_pos;
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static volatile bool slave_has_register_set = false;
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// Wait for an i2c operation to finish
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inline static
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void i2c_delay(void) {
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uint16_t lim = 0;
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while(!(TWCR & (1<<TWINT)) && lim < I2C_LOOP_TIMEOUT)
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lim++;
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// easier way, but will wait slightly longer
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// _delay_us(100);
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}
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// Setup twi to run at 100kHz or 400kHz (see ./i2c.h SCL_CLOCK)
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void i2c_master_init(void) {
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// no prescaler
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TWSR = 0;
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// Set TWI clock frequency to SCL_CLOCK. Need TWBR>10.
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// Check datasheets for more info.
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TWBR = ((F_CPU/SCL_CLOCK)-16)/2;
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}
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// Start a transaction with the given i2c slave address. The direction of the
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// transfer is set with I2C_READ and I2C_WRITE.
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// returns: 0 => success
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// 1 => error
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uint8_t i2c_master_start(uint8_t address) {
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TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTA);
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i2c_delay();
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// check that we started successfully
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if ( (TW_STATUS != TW_START) && (TW_STATUS != TW_REP_START))
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return 1;
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TWDR = address;
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TWCR = (1<<TWINT) | (1<<TWEN);
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i2c_delay();
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if ( (TW_STATUS != TW_MT_SLA_ACK) && (TW_STATUS != TW_MR_SLA_ACK) )
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return 1; // slave did not acknowledge
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else
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return 0; // success
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}
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// Finish the i2c transaction.
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void i2c_master_stop(void) {
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TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
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uint16_t lim = 0;
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while(!(TWCR & (1<<TWSTO)) && lim < I2C_LOOP_TIMEOUT)
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lim++;
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}
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// Write one byte to the i2c slave.
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// returns 0 => slave ACK
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// 1 => slave NACK
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uint8_t i2c_master_write(uint8_t data) {
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TWDR = data;
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TWCR = (1<<TWINT) | (1<<TWEN);
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i2c_delay();
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// check if the slave acknowledged us
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return (TW_STATUS == TW_MT_DATA_ACK) ? 0 : 1;
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}
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// Read one byte from the i2c slave. If ack=1 the slave is acknowledged,
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// if ack=0 the acknowledge bit is not set.
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// returns: byte read from i2c device
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uint8_t i2c_master_read(int ack) {
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TWCR = (1<<TWINT) | (1<<TWEN) | (ack<<TWEA);
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i2c_delay();
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return TWDR;
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}
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void i2c_reset_state(void) {
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TWCR = 0;
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}
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void i2c_slave_init(uint8_t address) {
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TWAR = address << 0; // slave i2c address
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// TWEN - twi enable
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// TWEA - enable address acknowledgement
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// TWINT - twi interrupt flag
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// TWIE - enable the twi interrupt
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TWCR = (1<<TWIE) | (1<<TWEA) | (1<<TWINT) | (1<<TWEN);
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}
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ISR(TWI_vect);
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ISR(TWI_vect) {
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uint8_t ack = 1;
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switch(TW_STATUS) {
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case TW_SR_SLA_ACK:
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// this device has been addressed as a slave receiver
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slave_has_register_set = false;
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break;
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case TW_SR_DATA_ACK:
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// this device has received data as a slave receiver
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// The first byte that we receive in this transaction sets the location
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// of the read/write location of the slaves memory that it exposes over
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// i2c. After that, bytes will be written at slave_buffer_pos, incrementing
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// slave_buffer_pos after each write.
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if(!slave_has_register_set) {
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slave_buffer_pos = TWDR;
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// don't acknowledge the master if this memory loctaion is out of bounds
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if ( slave_buffer_pos >= SLAVE_BUFFER_SIZE ) {
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ack = 0;
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slave_buffer_pos = 0;
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}
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slave_has_register_set = true;
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} else {
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i2c_slave_buffer[slave_buffer_pos] = TWDR;
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BUFFER_POS_INC();
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}
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break;
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case TW_ST_SLA_ACK:
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case TW_ST_DATA_ACK:
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// master has addressed this device as a slave transmitter and is
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// requesting data.
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TWDR = i2c_slave_buffer[slave_buffer_pos];
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BUFFER_POS_INC();
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break;
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case TW_BUS_ERROR: // something went wrong, reset twi state
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TWCR = 0;
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default:
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break;
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}
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// Reset everything, so we are ready for the next TWI interrupt
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TWCR |= (1<<TWIE) | (1<<TWINT) | (ack<<TWEA) | (1<<TWEN);
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}
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