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/* 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_SWPULLUP 0x0F // PG3 |
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#define IS31FL3736_REG_CSPULLUP 0x10 // PG3 |
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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_SWPULLUP |
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# define IS31FL3736_SWPULLUP IS31FL3736_PUR_0R |
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#endif |
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#ifndef IS31FL3736_CSPULLUP |
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# define IS31FL3736_CSPULLUP IS31FL3736_PUR_0R |
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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][192]; |
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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][24] = {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 < 192; 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(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 = 0x00; i <= 0x17; 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 = 0x00; i <= 0xBF; 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_SWPULLUP, IS31FL3736_SWPULLUP); |
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// Set de-ghost pull-down resistors (CSx) |
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is31fl3736_write_register(addr, IS31FL3736_REG_CSPULLUP, IS31FL3736_CSPULLUP); |
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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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is31_led led; |
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if (index >= 0 && index < LED_MATRIX_LED_COUNT) { |
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memcpy_P(&led, (&g_is31_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 < LED_MATRIX_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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is31_led led; |
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memcpy_P(&led, (&g_is31_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 < 24; 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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} |