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Diffstat (limited to 'drivers/issi/is31fl3218.c')
-rw-r--r--drivers/issi/is31fl3218.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/issi/is31fl3218.c b/drivers/issi/is31fl3218.c
new file mode 100644
index 0000000000..db44f72564
--- /dev/null
+++ b/drivers/issi/is31fl3218.c
@@ -0,0 +1,102 @@
+/* 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 "i2c_master.h"
+
+// This is the full 8-bit address
+#define ISSI_ADDRESS 0b10101000
+
+// These are the register addresses
+#define ISSI_REG_SHUTDOWN 0x00
+#define ISSI_REG_PWM 0x01
+#define ISSI_REG_CONTROL 0x13
+#define ISSI_REG_UPDATE 0x16
+#define ISSI_REG_RESET 0x17
+
+// Default timeout if no I2C response
+#define ISSI_TIMEOUT 100
+
+// Reusable buffer for transfers
+uint8_t g_twi_transfer_buffer[20];
+
+// IS31FL3218 has 18 PWM outputs and a fixed I2C address, so no chaining.
+// If used as RGB LED driver, LEDs are assigned RGB,RGB,RGB,RGB,RGB,RGB
+uint8_t g_pwm_buffer[18];
+bool g_pwm_buffer_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;
+ i2c_transmit( ISSI_ADDRESS, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
+}
+
+void IS31FL3218_write_pwm_buffer( uint8_t *pwm_buffer )
+{
+ g_twi_transfer_buffer[0] = ISSI_REG_PWM;
+ for ( int i=0; i<18; i++ ) {
+ g_twi_transfer_buffer[1+i] = pwm_buffer[i];
+ }
+
+ i2c_transmit( ISSI_ADDRESS, g_twi_transfer_buffer, 19, ISSI_TIMEOUT);
+}
+
+void IS31FL3218_init(void)
+{
+ // In case we ever want to reinitialize (?)
+ IS31FL3218_write_register( ISSI_REG_RESET, 0x00 );
+
+ // Turn off software shutdown
+ IS31FL3218_write_register( ISSI_REG_SHUTDOWN, 0x01 );
+
+ // Set all PWM values to zero
+ for ( uint8_t i = 0; i < 18; i++ ) {
+ IS31FL3218_write_register( ISSI_REG_PWM+i, 0x00 );
+ }
+
+ // Enable all channels
+ for ( uint8_t i = 0; i < 3; i++ ) {
+ IS31FL3218_write_register( ISSI_REG_CONTROL+i, 0b00111111 );
+ }
+
+ // Load PWM registers and LED Control register data
+ IS31FL3218_write_register( ISSI_REG_UPDATE, 0x01 );
+}
+
+void IS31FL3218_set_color( int index, uint8_t red, uint8_t green, uint8_t blue )
+{
+ g_pwm_buffer[index * 3 + 0] = red;
+ g_pwm_buffer[index * 3 + 1] = green;
+ g_pwm_buffer[index * 3 + 2] = blue;
+ g_pwm_buffer_update_required = true;
+}
+
+void IS31FL3218_set_color_all( uint8_t red, uint8_t green, uint8_t blue )
+{
+ for ( int i = 0; i < 6; i++ ) {
+ IS31FL3218_set_color( i, red, green, blue );
+ }
+}
+
+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( ISSI_REG_UPDATE, 0x01 );
+ }
+ g_pwm_buffer_update_required = false;
+}