268 lines
10 KiB
C
268 lines
10 KiB
C
/* Copyright 2018 Jason Williams (Wilba)
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* Copyright 2021 Doni Crosby
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "is31fl3736-simple.h"
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#include <string.h>
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#include "i2c_master.h"
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#include "wait.h"
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#define IS31FL3736_COMMANDREGISTER 0xFD
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#define IS31FL3736_COMMANDREGISTER_WRITELOCK 0xFE
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#define IS31FL3736_INTERRUPTMASKREGISTER 0xF0
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#define IS31FL3736_INTERRUPTSTATUSREGISTER 0xF1
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#define IS31FL3736_PAGE_LEDCONTROL 0x00 // PG0
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#define IS31FL3736_PAGE_PWM 0x01 // PG1
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#define IS31FL3736_PAGE_AUTOBREATH 0x02 // PG2
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#define IS31FL3736_PAGE_FUNCTION 0x03 // PG3
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#define IS31FL3736_REG_CONFIGURATION 0x00 // PG3
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#define IS31FL3736_REG_GLOBALCURRENT 0x01 // PG3
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#define IS31FL3736_REG_RESET 0x11 // PG3
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#define IS31FL3736_REG_SW_PULLUP 0x0F // PG3
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#define IS31FL3736_REG_CS_PULLDOWN 0x10 // PG3
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#define IS31FL3736_PWM_REGISTER_COUNT 192 // actually 96
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#define IS31FL3736_LED_CONTROL_REGISTER_COUNT 24
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#ifndef IS31FL3736_I2C_TIMEOUT
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# define IS31FL3736_I2C_TIMEOUT 100
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#endif
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#ifndef IS31FL3736_I2C_PERSISTENCE
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# define IS31FL3736_I2C_PERSISTENCE 0
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#endif
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#ifndef IS31FL3736_PWM_FREQUENCY
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# define IS31FL3736_PWM_FREQUENCY IS31FL3736_PWM_FREQUENCY_8K4_HZ // PFS - IS31FL3736B only
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#endif
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#ifndef IS31FL3736_SW_PULLUP
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# define IS31FL3736_SW_PULLUP IS31FL3736_PUR_0_OHM
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#endif
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#ifndef IS31FL3736_CS_PULLDOWN
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# define IS31FL3736_CS_PULLDOWN IS31FL3736_PDR_0_OHM
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#endif
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#ifndef IS31FL3736_GLOBALCURRENT
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# define IS31FL3736_GLOBALCURRENT 0xFF
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#endif
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// Transfer buffer for TWITransmitData()
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uint8_t g_twi_transfer_buffer[20];
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// These buffers match the IS31FL3736 PWM registers.
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// The control buffers match the PG0 LED On/Off registers.
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// Storing them like this is optimal for I2C transfers to the registers.
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// We could optimize this and take out the unused registers from these
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// buffers and the transfers in is31fl3736_write_pwm_buffer() but it's
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// probably not worth the extra complexity.
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uint8_t g_pwm_buffer[IS31FL3736_DRIVER_COUNT][IS31FL3736_PWM_REGISTER_COUNT];
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bool g_pwm_buffer_update_required[IS31FL3736_DRIVER_COUNT] = {false};
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uint8_t g_led_control_registers[IS31FL3736_DRIVER_COUNT][IS31FL3736_LED_CONTROL_REGISTER_COUNT] = {0};
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bool g_led_control_registers_update_required[IS31FL3736_DRIVER_COUNT] = {false};
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void is31fl3736_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
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g_twi_transfer_buffer[0] = reg;
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g_twi_transfer_buffer[1] = data;
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#if IS31FL3736_I2C_PERSISTENCE > 0
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for (uint8_t i = 0; i < IS31FL3736_I2C_PERSISTENCE; i++) {
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if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, IS31FL3736_I2C_TIMEOUT) == 0) break;
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}
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#else
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i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, IS31FL3736_I2C_TIMEOUT);
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#endif
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}
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void is31fl3736_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
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// assumes PG1 is already selected
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// transmit PWM registers in 12 transfers of 16 bytes
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// g_twi_transfer_buffer[] is 20 bytes
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// iterate over the pwm_buffer contents at 16 byte intervals
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for (int i = 0; i < IS31FL3736_PWM_REGISTER_COUNT; i += 16) {
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g_twi_transfer_buffer[0] = i;
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// copy the data from i to i+15
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// device will auto-increment register for data after the first byte
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// thus this sets registers 0x00-0x0F, 0x10-0x1F, etc. in one transfer
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memcpy(g_twi_transfer_buffer + 1, pwm_buffer + i, 16);
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#if IS31FL3736_I2C_PERSISTENCE > 0
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for (uint8_t i = 0; i < IS31FL3736_I2C_PERSISTENCE; i++) {
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if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, IS31FL3736_I2C_TIMEOUT) == 0) break;
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}
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#else
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i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, IS31FL3736_I2C_TIMEOUT);
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#endif
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}
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}
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void is31fl3736_init_drivers(void) {
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i2c_init();
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is31fl3736_init(IS31FL3736_I2C_ADDRESS_1);
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#if defined(IS31FL3736_I2C_ADDRESS_2)
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is31fl3736_init(IS31FL3736_I2C_ADDRESS_2);
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# if defined(IS31FL3736_I2C_ADDRESS_3)
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is31fl3736_init(IS31FL3736_I2C_ADDRESS_3);
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# if defined(IS31FL3736_I2C_ADDRESS_4)
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is31fl3736_init(IS31FL3736_I2C_ADDRESS_4);
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# endif
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# endif
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#endif
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for (int i = 0; i < IS31FL3736_LED_COUNT; i++) {
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is31fl3736_set_led_control_register(i, true);
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}
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is31fl3736_update_led_control_registers(IS31FL3736_I2C_ADDRESS_1, 0);
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#if defined(IS31FL3736_I2C_ADDRESS_2)
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is31fl3736_update_led_control_registers(IS31FL3736_I2C_ADDRESS_2, 1);
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# if defined(IS31FL3736_I2C_ADDRESS_3)
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is31fl3736_update_led_control_registers(IS31FL3736_I2C_ADDRESS_3, 2);
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# if defined(IS31FL3736_I2C_ADDRESS_4)
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is31fl3736_update_led_control_registers(IS31FL3736_I2C_ADDRESS_4, 3);
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# endif
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# endif
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#endif
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}
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void is31fl3736_init(uint8_t addr) {
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// In order to avoid the LEDs being driven with garbage data
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// in the LED driver's PWM registers, shutdown is enabled last.
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// Set up the mode and other settings, clear the PWM registers,
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// then disable software shutdown.
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// Unlock the command register.
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is31fl3736_write_register(addr, IS31FL3736_COMMANDREGISTER_WRITELOCK, 0xC5);
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// Select PG0
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is31fl3736_write_register(addr, IS31FL3736_COMMANDREGISTER, IS31FL3736_PAGE_LEDCONTROL);
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// Turn off all LEDs.
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for (int i = 0; i < IS31FL3736_LED_CONTROL_REGISTER_COUNT; i++) {
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is31fl3736_write_register(addr, i, 0x00);
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}
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// Unlock the command register.
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is31fl3736_write_register(addr, IS31FL3736_COMMANDREGISTER_WRITELOCK, 0xC5);
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// Select PG1
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is31fl3736_write_register(addr, IS31FL3736_COMMANDREGISTER, IS31FL3736_PAGE_PWM);
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// Set PWM on all LEDs to 0
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// No need to setup Breath registers to PWM as that is the default.
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for (int i = 0; i < IS31FL3736_PWM_REGISTER_COUNT; i++) {
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is31fl3736_write_register(addr, i, 0x00);
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}
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// Unlock the command register.
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is31fl3736_write_register(addr, IS31FL3736_COMMANDREGISTER_WRITELOCK, 0xC5);
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// Select PG3
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is31fl3736_write_register(addr, IS31FL3736_COMMANDREGISTER, IS31FL3736_PAGE_FUNCTION);
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// Set de-ghost pull-up resistors (SWx)
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is31fl3736_write_register(addr, IS31FL3736_REG_SW_PULLUP, IS31FL3736_SW_PULLUP);
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// Set de-ghost pull-down resistors (CSx)
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is31fl3736_write_register(addr, IS31FL3736_REG_CS_PULLDOWN, IS31FL3736_CS_PULLDOWN);
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// Set global current to maximum.
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is31fl3736_write_register(addr, IS31FL3736_REG_GLOBALCURRENT, IS31FL3736_GLOBALCURRENT);
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// Disable software shutdown.
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is31fl3736_write_register(addr, IS31FL3736_REG_CONFIGURATION, ((IS31FL3736_PWM_FREQUENCY & 0b111) << 3) | 0x01);
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// Wait 10ms to ensure the device has woken up.
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wait_ms(10);
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}
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void is31fl3736_set_value(int index, uint8_t value) {
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is31fl3736_led_t led;
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if (index >= 0 && index < IS31FL3736_LED_COUNT) {
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memcpy_P(&led, (&g_is31fl3736_leds[index]), sizeof(led));
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if (g_pwm_buffer[led.driver][led.v] == value) {
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return;
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}
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g_pwm_buffer[led.driver][led.v] = value;
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g_pwm_buffer_update_required[led.driver] = true;
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}
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}
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void is31fl3736_set_value_all(uint8_t value) {
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for (int i = 0; i < IS31FL3736_LED_COUNT; i++) {
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is31fl3736_set_value(i, value);
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}
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}
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void is31fl3736_set_led_control_register(uint8_t index, bool value) {
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is31fl3736_led_t led;
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memcpy_P(&led, (&g_is31fl3736_leds[index]), sizeof(led));
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// The PWM register for a matrix position (0x00 to 0xBF) is interleaved, so:
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// A1=0x00 A2=0x02 A3=0x04 A4=0x06 A5=0x08 A6=0x0A A7=0x0C A8=0x0E
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// B1=0x10 B2=0x12 B3=0x14
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// But also, the LED control registers (0x00 to 0x17) are also interleaved, so:
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// A1-A4=0x00 A5-A8=0x01
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uint8_t control_register = led.v / 8;
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uint8_t bit_value = led.v % 8;
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if (value) {
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g_led_control_registers[led.driver][control_register] |= (1 << bit_value);
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} else {
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g_led_control_registers[led.driver][control_register] &= ~(1 << bit_value);
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}
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g_led_control_registers_update_required[led.driver] = true;
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}
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void is31fl3736_update_pwm_buffers(uint8_t addr, uint8_t index) {
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if (g_pwm_buffer_update_required[index]) {
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// Firstly we need to unlock the command register and select PG1
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is31fl3736_write_register(addr, IS31FL3736_COMMANDREGISTER_WRITELOCK, 0xC5);
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is31fl3736_write_register(addr, IS31FL3736_COMMANDREGISTER, IS31FL3736_PAGE_PWM);
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is31fl3736_write_pwm_buffer(addr, g_pwm_buffer[index]);
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g_pwm_buffer_update_required[index] = false;
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}
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}
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void is31fl3736_update_led_control_registers(uint8_t addr, uint8_t index) {
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if (g_led_control_registers_update_required[index]) {
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// Firstly we need to unlock the command register and select PG0
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is31fl3736_write_register(addr, IS31FL3736_COMMANDREGISTER_WRITELOCK, 0xC5);
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is31fl3736_write_register(addr, IS31FL3736_COMMANDREGISTER, IS31FL3736_PAGE_LEDCONTROL);
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for (int i = 0; i < IS31FL3736_LED_CONTROL_REGISTER_COUNT; i++) {
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is31fl3736_write_register(addr, i, g_led_control_registers[index][i]);
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}
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g_led_control_registers_update_required[index] = false;
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}
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}
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void is31fl3736_flush(void) {
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is31fl3736_update_pwm_buffers(IS31FL3736_I2C_ADDRESS_1, 0);
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#if defined(IS31FL3736_I2C_ADDRESS_2)
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is31fl3736_update_pwm_buffers(IS31FL3736_I2C_ADDRESS_2, 1);
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# if defined(IS31FL3736_I2C_ADDRESS_3)
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is31fl3736_update_pwm_buffers(IS31FL3736_I2C_ADDRESS_3, 2);
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# if defined(IS31FL3736_I2C_ADDRESS_4)
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is31fl3736_update_pwm_buffers(IS31FL3736_I2C_ADDRESS_4, 3);
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# endif
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# endif
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#endif
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}
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