IS31FL3733 driver for LED Matrix

drivers/led/issi/is31fl3733-simple.c

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+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ * Copyright 2021 Doni Crosby
+ * Copyright 2021 Leo Deng
+ *
+ * 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 2 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 "is31fl3733-simple.h"
+#include "i2c_master.h"
+#include "wait.h"
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 00 <-> GND
+// 01 <-> SCL
+// 10 <-> SDA
+// 11 <-> VCC
+// ADDR1 represents A1:A0 of the 7-bit address.
+// ADDR2 represents A3:A2 of the 7-bit address.
+// The result is: 0b101(ADDR2)(ADDR1)
+#define ISSI_ADDR_DEFAULT 0x50
+
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
+#define ISSI_INTERRUPTMASKREGISTER 0xF0
+#define ISSI_INTERRUPTSTATUSREGISTER 0xF1
+
+#define ISSI_PAGE_LEDCONTROL 0x00  // PG0
+#define ISSI_PAGE_PWM 0x01         // PG1
+#define ISSI_PAGE_AUTOBREATH 0x02  // PG2
+#define ISSI_PAGE_FUNCTION 0x03    // PG3
+
+#define ISSI_REG_CONFIGURATION 0x00  // PG3
+#define ISSI_REG_GLOBALCURRENT 0x01  // PG3
+#define ISSI_REG_RESET 0x11          // PG3
+#define ISSI_REG_SWPULLUP 0x0F       // PG3
+#define ISSI_REG_CSPULLUP 0x10       // PG3
+
+#ifndef ISSI_TIMEOUT
+#    define ISSI_TIMEOUT 100
+#endif
+
+#ifndef ISSI_PERSISTENCE
+#    define ISSI_PERSISTENCE 0
+#endif
+
+#ifndef ISSI_PWM_FREQUENCY
+#    define ISSI_PWM_FREQUENCY 0b000  // PFS - IS31FL3733B only
+#endif
+
+#ifndef ISSI_SWPULLUP
+#    define ISSI_SWPULLUP PUR_0R
+#endif
+
+#ifndef ISSI_CSPULLUP
+#    define ISSI_CSPULLUP PUR_0R
+#endif
+
+// Transfer buffer for TWITransmitData()
+uint8_t g_twi_transfer_buffer[20];
+
+// These buffers match the IS31FL3733 PWM registers.
+// The control buffers match the PG0 LED On/Off registers.
+// Storing them like this is optimal for I2C transfers to the registers.
+// We could optimize this and take out the unused registers from these
+// buffers and the transfers in IS31FL3733_write_pwm_buffer() but it's
+// probably not worth the extra complexity.
+uint8_t g_pwm_buffer[LED_DRIVER_COUNT][192];
+bool    g_pwm_buffer_update_required[LED_DRIVER_COUNT] = {false};
+
+/* There's probably a better way to init this... */
+#if LED_DRIVER_COUNT == 1
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][24] = {{0}};
+#elif LED_DRIVER_COUNT == 2
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][24] = {{0}, {0}};
+#elif LED_DRIVER_COUNT == 3
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][24] = {{0}, {0}, {0}};
+#elif LED_DRIVER_COUNT == 4
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][24] = {{0}, {0}, {0}, {0}};
+#endif
+bool g_led_control_registers_update_required[LED_DRIVER_COUNT] = {false};
+
+bool IS31FL3733_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    // If the transaction fails function returns false.
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+
+#if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) != 0) {
+            return false;
+        }
+    }
+#else
+    if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) != 0) {
+        return false;
+    }
+#endif
+    return true;
+}
+
+bool IS31FL3733_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // Assumes PG1 is already selected.
+    // If any of the transactions fails function returns false.
+    // Transmit PWM registers in 12 transfers of 16 bytes.
+    // g_twi_transfer_buffer[] is 20 bytes
+
+    // Iterate over the pwm_buffer contents at 16 byte intervals.
+    for (int i = 0; i < 192; i += 16) {
+        g_twi_transfer_buffer[0] = i;
+        // Copy the data from i to i+15.
+        // Device will auto-increment register for data after the first byte
+        // Thus this sets registers 0x00-0x0F, 0x10-0x1F, etc. in one transfer.
+        for (int j = 0; j < 16; j++) {
+            g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
+        }
+
+#if ISSI_PERSISTENCE > 0
+        for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) != 0) {
+                return false;
+            }
+        }
+#else
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) != 0) {
+            return false;
+        }
+#endif
+    }
+    return true;
+}
+
+void IS31FL3733_init(uint8_t addr, uint8_t sync) {
+    // In order to avoid the LEDs being driven with garbage data
+    // in the LED driver's PWM registers, shutdown is enabled last.
+    // Set up the mode and other settings, clear the PWM registers,
+    // then disable software shutdown.
+    // Sync is passed so set it according to the datasheet.
+
+    // Unlock the command register.
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG0
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+    // Turn off all LEDs.
+    for (int i = 0x00; i <= 0x17; i++) {
+        IS31FL3733_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG1
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+    // Set PWM on all LEDs to 0
+    // No need to setup Breath registers to PWM as that is the default.
+    for (int i = 0x00; i <= 0xBF; i++) {
+        IS31FL3733_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG3
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_FUNCTION);
+    // Set de-ghost pull-up resistors (SWx)
+    IS31FL3733_write_register(addr, ISSI_REG_SWPULLUP, ISSI_SWPULLUP);
+    // Set de-ghost pull-down resistors (CSx)
+    IS31FL3733_write_register(addr, ISSI_REG_CSPULLUP, ISSI_CSPULLUP);
+    // Set global current to maximum.
+    IS31FL3733_write_register(addr, ISSI_REG_GLOBALCURRENT, 0xFF);
+    // Disable software shutdown.
+    IS31FL3733_write_register(addr, ISSI_REG_CONFIGURATION, ((sync & 0b11) << 6) | ((ISSI_PWM_FREQUENCY & 0b111) << 3) | 0x01);
+
+    // Wait 10ms to ensure the device has woken up.
+    wait_ms(10);
+}
+
+void IS31FL3733_set_value(int index, uint8_t value) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        is31_led led = g_is31_leds[index];
+
+        g_pwm_buffer[led.driver][led.v]          = value;
+        g_pwm_buffer_update_required[led.driver] = true;
+    }
+}
+
+void IS31FL3733_set_value_all(uint8_t value) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        IS31FL3733_set_value(i, value);
+    }
+}
+
+void IS31FL3733_set_led_control_register(uint8_t index, bool value) {
+    is31_led led = g_is31_leds[index];
+
+    uint8_t control_register = led.v / 8;
+    uint8_t bit_value        = led.v % 8;
+
+    if (value) {
+        g_led_control_registers[led.driver][control_register] |= (1 << bit_value);
+    } else {
+        g_led_control_registers[led.driver][control_register] &= ~(1 << bit_value);
+    }
+
+    g_led_control_registers_update_required[led.driver] = true;
+}
+
+void IS31FL3733_update_pwm_buffers(uint8_t addr, uint8_t index) {
+    if (g_pwm_buffer_update_required[index]) {
+        // Firstly we need to unlock the command register and select PG1.
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+
+        // If any of the transactions fail we risk writing dirty PG0,
+        // refresh page 0 just in case.
+        if (!IS31FL3733_write_pwm_buffer(addr, g_pwm_buffer[index])) {
+            g_led_control_registers_update_required[index] = true;
+        }
+        g_pwm_buffer_update_required[index] = false;
+    }
+}
+
+void IS31FL3733_update_led_control_registers(uint8_t addr, uint8_t index) {
+    if (g_led_control_registers_update_required[index]) {
+        // Firstly we need to unlock the command register and select PG0
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+        for (int i = 0; i < 24; i++) {
+            IS31FL3733_write_register(addr, i, g_led_control_registers[index][i]);
+        }
+        g_led_control_registers_update_required[index] = false;
+    }
+}