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+/* Copyright 2018 Jason Williams (Wilba)
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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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+
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+
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+#ifdef __AVR__
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+#include <avr/interrupt.h>
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+#include <avr/io.h>
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+#include <util/delay.h>
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+#else
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+#include "wait.h"
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+#endif
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+
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+#include "is31fl3736.h"
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+#include <string.h>
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+#include "i2c_master.h"
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+#include "progmem.h"
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+
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+
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+
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+// This is a 7-bit address, that gets left-shifted and bit 0
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+// set to 0 for write, 1 for read (as per I2C protocol)
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+// The address will vary depending on your wiring:
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+// 00 <-> GND
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+// 01 <-> SCL
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+// 10 <-> SDA
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+// 11 <-> VCC
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+// ADDR1 represents A1:A0 of the 7-bit address.
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+// ADDR2 represents A3:A2 of the 7-bit address.
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+// The result is: 0b101(ADDR2)(ADDR1)
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+#define ISSI_ADDR_DEFAULT 0x50
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+
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+#define ISSI_COMMANDREGISTER 0xFD
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+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
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+#define ISSI_INTERRUPTMASKREGISTER 0xF0
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+#define ISSI_INTERRUPTSTATUSREGISTER 0xF1
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+
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+#define ISSI_PAGE_LEDCONTROL 0x00 //PG0
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+#define ISSI_PAGE_PWM 0x01 //PG1
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+#define ISSI_PAGE_AUTOBREATH 0x02 //PG2
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+#define ISSI_PAGE_FUNCTION 0x03 //PG3
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+
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+#define ISSI_REG_CONFIGURATION 0x00 //PG3
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+#define ISSI_REG_GLOBALCURRENT 0x01 //PG3
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+#define ISSI_REG_RESET 0x11// PG3
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+#define ISSI_REG_SWPULLUP 0x0F //PG3
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+#define ISSI_REG_CSPULLUP 0x10 //PG3
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+
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+#ifndef ISSI_TIMEOUT
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+ #define ISSI_TIMEOUT 100
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+#endif
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+
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+#ifndef ISSI_PERSISTENCE
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+ #define ISSI_PERSISTENCE 0
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+#endif
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+
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+// Transfer buffer for TWITransmitData()
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+uint8_t g_twi_transfer_buffer[20];
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+
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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[DRIVER_COUNT][192];
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+bool g_pwm_buffer_update_required = false;
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+
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+uint8_t g_led_control_registers[DRIVER_COUNT][24] = { { 0 }, { 0 } };
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+bool g_led_control_registers_update_required = false;
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+
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+void IS31FL3736_write_register( uint8_t addr, uint8_t reg, uint8_t data )
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+{
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+ g_twi_transfer_buffer[0] = reg;
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+ g_twi_transfer_buffer[1] = data;
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+
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+ #if ISSI_PERSISTENCE > 0
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+ for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
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+ if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) == 0)
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+ break;
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+ }
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+ #else
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+ i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
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+ #endif
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+}
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+
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+void IS31FL3736_write_pwm_buffer( uint8_t addr, uint8_t *pwm_buffer )
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+{
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+ // assumes PG1 is already selected
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+
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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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+
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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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+ for ( int j = 0; j < 16; j++ ) {
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+ g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
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+ }
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+
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+ #if ISSI_PERSISTENCE > 0
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+ for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
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+ if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) == 0)
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+ break;
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+ }
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+ #else
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+ i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT);
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+ #endif
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+ }
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+}
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+
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+void IS31FL3736_init( uint8_t addr )
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+{
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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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+
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+ // Unlock the command register.
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+ IS31FL3736_write_register( addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5 );
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+
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+ // Select PG0
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+ IS31FL3736_write_register( addr, ISSI_COMMANDREGISTER, ISSI_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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+ {
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+ IS31FL3736_write_register( addr, i, 0x00 );
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+ }
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+
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+ // Unlock the command register.
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+ IS31FL3736_write_register( addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5 );
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+
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+ // Select PG1
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+ IS31FL3736_write_register( addr, ISSI_COMMANDREGISTER, ISSI_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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+ {
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+ IS31FL3736_write_register( addr, i, 0x00 );
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+ }
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+
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+ // Unlock the command register.
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+ IS31FL3736_write_register( addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5 );
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+
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+ // Select PG3
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+ IS31FL3736_write_register( addr, ISSI_COMMANDREGISTER, ISSI_PAGE_FUNCTION );
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+ // Set global current to maximum.
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+ IS31FL3736_write_register( addr, ISSI_REG_GLOBALCURRENT, 0xFF );
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+ // Disable software shutdown.
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+ IS31FL3736_write_register( addr, ISSI_REG_CONFIGURATION, 0x01 );
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+
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+ // Wait 10ms to ensure the device has woken up.
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+ #ifdef __AVR__
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+ _delay_ms( 10 );
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+ #else
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+ wait_ms(10);
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+ #endif
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+}
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+
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+void IS31FL3736_set_color( int index, uint8_t red, uint8_t green, uint8_t blue )
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+{
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+ if ( index >= 0 && index < DRIVER_LED_TOTAL ) {
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+ is31_led led = g_is31_leds[index];
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+
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+ g_pwm_buffer[led.driver][led.r] = red;
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+ g_pwm_buffer[led.driver][led.g] = green;
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+ g_pwm_buffer[led.driver][led.b] = blue;
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+ g_pwm_buffer_update_required = true;
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+ }
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+}
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+
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+void IS31FL3736_set_color_all( uint8_t red, uint8_t green, uint8_t blue )
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+{
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+ for ( int i = 0; i < DRIVER_LED_TOTAL; i++ )
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+ {
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+ IS31FL3736_set_color( i, red, green, blue );
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+ }
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+}
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+
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+void IS31FL3736_set_led_control_register( uint8_t index, bool red, bool green, bool blue )
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+{
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+ is31_led led = g_is31_leds[index];
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+
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+ // IS31FL3733
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+ // The PWM register for a matrix position (0x00 to 0xBF) can be
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+ // divided by 8 to get the LED control register (0x00 to 0x17),
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+ // then mod 8 to get the bit position within that register.
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+
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+ // IS31FL3736
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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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+ // So, the same math applies.
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+
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+ uint8_t control_register_r = led.r / 8;
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+ uint8_t control_register_g = led.g / 8;
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+ uint8_t control_register_b = led.b / 8;
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+
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+ uint8_t bit_r = led.r % 8;
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+ uint8_t bit_g = led.g % 8;
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+ uint8_t bit_b = led.b % 8;
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+
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+ if ( red ) {
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+ g_led_control_registers[led.driver][control_register_r] |= (1 << bit_r);
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+ } else {
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+ g_led_control_registers[led.driver][control_register_r] &= ~(1 << bit_r);
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+ }
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+ if ( green ) {
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+ g_led_control_registers[led.driver][control_register_g] |= (1 << bit_g);
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+ } else {
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+ g_led_control_registers[led.driver][control_register_g] &= ~(1 << bit_g);
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+ }
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+ if ( blue ) {
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+ g_led_control_registers[led.driver][control_register_b] |= (1 << bit_b);
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+ } else {
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+ g_led_control_registers[led.driver][control_register_b] &= ~(1 << bit_b);
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+ }
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+
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+ g_led_control_registers_update_required = true;
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+
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+}
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+
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+void IS31FL3736_mono_set_brightness( int index, uint8_t value )
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+{
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+ if ( index >= 0 && index < 96 ) {
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+ // Index in range 0..95 -> A1..A8, B1..B8, etc.
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+ // Map index 0..95 to registers 0x00..0xBE (interleaved)
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+ uint8_t pwm_register = index * 2;
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+ g_pwm_buffer[0][pwm_register] = value;
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+ g_pwm_buffer_update_required = true;
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+ }
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+}
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+
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+void IS31FL3736_mono_set_brightness_all( uint8_t value )
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+{
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+ for ( int i = 0; i < 96; i++ )
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+ {
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+ IS31FL3736_mono_set_brightness( i, value );
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+ }
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+}
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+
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+void IS31FL3736_mono_set_led_control_register( uint8_t index, bool enabled )
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+{
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+ // Index in range 0..95 -> A1..A8, B1..B8, etc.
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+
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+ // Map index 0..95 to registers 0x00..0xBE (interleaved)
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+ uint8_t pwm_register = index * 2;
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+ // Map register 0x00..0xBE (interleaved) into control register and bit
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+ uint8_t control_register = pwm_register / 8;
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+ uint8_t bit = pwm_register % 8;
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+
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+ if ( enabled ) {
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+ g_led_control_registers[0][control_register] |= (1 << bit);
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+ } else {
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+ g_led_control_registers[0][control_register] &= ~(1 << bit);
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+ }
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+
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+ g_led_control_registers_update_required = true;
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+}
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+
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+void IS31FL3736_update_pwm_buffers( uint8_t addr1, uint8_t addr2 )
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+{
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+ if ( g_pwm_buffer_update_required )
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+ {
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+ // Firstly we need to unlock the command register and select PG1
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+ IS31FL3736_write_register( addr1, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5 );
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+ IS31FL3736_write_register( addr1, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM );
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+
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+ IS31FL3736_write_pwm_buffer( addr1, g_pwm_buffer[0] );
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+ //IS31FL3736_write_pwm_buffer( addr2, g_pwm_buffer[1] );
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+ }
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+ g_pwm_buffer_update_required = false;
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+}
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+
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+void IS31FL3736_update_led_control_registers( uint8_t addr1, uint8_t addr2 )
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+{
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+ if ( g_led_control_registers_update_required )
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+ {
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+ // Firstly we need to unlock the command register and select PG0
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+ IS31FL3736_write_register( addr1, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5 );
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+ IS31FL3736_write_register( addr1, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL );
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+ for ( int i=0; i<24; i++ )
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+ {
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+ IS31FL3736_write_register(addr1, i, g_led_control_registers[0][i] );
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+ //IS31FL3736_write_register(addr2, i, g_led_control_registers[1][i] );
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+ }
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+ }
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+}
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+
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