1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/led/issi/is31fl3218-simple.c b/drivers/led/issi/is31fl3218-simple.c
new file mode 100644
index 0000000000..a78dedfcf1
--- /dev/null
+++ b/drivers/led/issi/is31fl3218-simple.c
@@ -0,0 +1,143 @@
+/* Copyright 2018 Jason Williams (Wilba)
+ *
+ * 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 "is31fl3218.h"
+#include <string.h>
+#include "i2c_master.h"
+
+// These are the register addresses
+#define IS31FL3218_REG_SHUTDOWN 0x00
+#define IS31FL3218_REG_PWM 0x01
+#define IS31FL3218_REG_CONTROL 0x13
+#define IS31FL3218_REG_UPDATE 0x16
+#define IS31FL3218_REG_RESET 0x17
+
+#ifndef IS31FL3218_I2C_TIMEOUT
+#    define IS31FL3218_I2C_TIMEOUT 100
+#endif
+
+#ifndef IS31FL3218_I2C_PERSISTENCE
+#    define IS31FL3218_I2C_PERSISTENCE 0
+#endif
+
+// Reusable buffer for transfers
+uint8_t g_twi_transfer_buffer[20];
+
+// IS31FL3218 has 18 PWM outputs and a fixed I2C address, so no chaining.
+uint8_t g_pwm_buffer[18];
+bool    g_pwm_buffer_update_required = false;
+
+uint8_t g_led_control_registers[3]              = {0};
+bool    g_led_control_registers_update_required = false;
+
+void is31fl3218_write_register(uint8_t reg, uint8_t data) {
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+#if IS31FL3218_I2C_PERSISTENCE > 0
+    for (uint8_t i = 0; i < IS31FL3218_I2C_PERSISTENCE; i++) {
+        if (i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 2, IS31FL3218_I2C_TIMEOUT) == 0) break;
+    }
+#else
+    i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 2, IS31FL3218_I2C_TIMEOUT);
+#endif
+}
+
+void is31fl3218_write_pwm_buffer(uint8_t *pwm_buffer) {
+    g_twi_transfer_buffer[0] = IS31FL3218_REG_PWM;
+    memcpy(g_twi_transfer_buffer + 1, pwm_buffer, 18);
+
+#if IS31FL3218_I2C_PERSISTENCE > 0
+    for (uint8_t i = 0; i < IS31FL3218_I2C_PERSISTENCE; i++) {
+        i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 19, IS31FL3218_I2C_TIMEOUT);
+    }
+#else
+    i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 19, IS31FL3218_I2C_TIMEOUT);
+#endif
+}
+
+void is31fl3218_init(void) {
+    // In case we ever want to reinitialize (?)
+    is31fl3218_write_register(IS31FL3218_REG_RESET, 0x00);
+
+    // Turn off software shutdown
+    is31fl3218_write_register(IS31FL3218_REG_SHUTDOWN, 0x01);
+
+    // Set all PWM values to zero
+    for (uint8_t i = 0; i < 18; i++) {
+        is31fl3218_write_register(IS31FL3218_REG_PWM + i, 0x00);
+    }
+
+    // turn off all LEDs in the LED control register
+    for (uint8_t i = 0; i < 3; i++) {
+        is31fl3218_write_register(IS31FL3218_REG_CONTROL + i, 0x00);
+    }
+
+    // Load PWM registers and LED Control register data
+    is31fl3218_write_register(IS31FL3218_REG_UPDATE, 0x01);
+}
+
+void is31fl3218_set_value(int index, uint8_t value) {
+    is31fl3218_led_t led;
+    if (index >= 0 && index < LED_MATRIX_LED_COUNT) {
+        memcpy_P(&led, (&g_is31fl3218_leds[index]), sizeof(led));
+    }
+    if (g_pwm_buffer[led.v - IS31FL3218_REG_PWM] == value) {
+        return;
+    }
+    g_pwm_buffer[led.v - IS31FL3218_REG_PWM] = value;
+    g_pwm_buffer_update_required             = true;
+}
+
+void is31fl3218_set_value_all(uint8_t value) {
+    for (int i = 0; i < LED_MATRIX_LED_COUNT; i++) {
+        is31fl3218_set_value(i, value);
+    }
+}
+
+void is31fl3218_set_led_control_register(uint8_t index, bool value) {
+    is31fl3218_led_t led;
+    memcpy_P(&led, (&g_is31fl3218_leds[index]), sizeof(led));
+
+    uint8_t control_register = (led.v - IS31FL3218_REG_PWM) / 6;
+    uint8_t bit_value        = (led.v - IS31FL3218_REG_PWM) % 6;
+
+    if (value) {
+        g_led_control_registers[control_register] |= (1 << bit_value);
+    } else {
+        g_led_control_registers[control_register] &= ~(1 << bit_value);
+    }
+
+    g_led_control_registers_update_required = true;
+}
+
+void is31fl3218_update_pwm_buffers(void) {
+    if (g_pwm_buffer_update_required) {
+        is31fl3218_write_pwm_buffer(g_pwm_buffer);
+        // Load PWM registers and LED Control register data
+        is31fl3218_write_register(IS31FL3218_REG_UPDATE, 0x01);
+
+        g_pwm_buffer_update_required = false;
+    }
+}
+
+void is31fl3218_update_led_control_registers(void) {
+    if (g_led_control_registers_update_required) {
+        for (int i = 0; i < 3; i++) {
+            is31fl3218_write_register(IS31FL3218_REG_CONTROL + i, g_led_control_registers[i]);
+        }
+
+        g_led_control_registers_update_required = false;
+    }
+}