From c51dfef958bce4a792b66db337d5c7cdf0956fc4 Mon Sep 17 00:00:00 2001
From: Scott Wilson <scott.t.wilson@gmail.com>
Date: Sun, 3 Dec 2017 10:32:07 -0500
Subject: Add support for LFKeyboard products: LFK78, LFK87 and SMK65

---
 keyboards/lfkeyboards/issi.c | 244 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 244 insertions(+)
 create mode 100644 keyboards/lfkeyboards/issi.c

(limited to 'keyboards/lfkeyboards/issi.c')

diff --git a/keyboards/lfkeyboards/issi.c b/keyboards/lfkeyboards/issi.c
new file mode 100644
index 000000000..e675a5986
--- /dev/null
+++ b/keyboards/lfkeyboards/issi.c
@@ -0,0 +1,244 @@
+#ifdef ISSI_ENABLE
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <util/delay.h>
+#include <avr/sfr_defs.h>
+#include <avr/io.h>
+#include <util/twi.h>
+#include "issi.h"
+#include "print.h"
+#include "TWIlib.h"
+
+#define ISSI_ADDR_DEFAULT 0xE8
+
+#define ISSI_REG_CONFIG 0x00
+#define ISSI_REG_CONFIG_PICTUREMODE 0x00
+#define ISSI_REG_CONFIG_AUTOPLAYMODE 0x08
+
+#define ISSI_CONF_PICTUREMODE 0x00
+#define ISSI_CONF_AUTOFRAMEMODE 0x04
+#define ISSI_CONF_AUDIOMODE 0x08
+
+#define ISSI_REG_PICTUREFRAME 0x01
+
+#define ISSI_REG_SHUTDOWN 0x0A
+#define ISSI_REG_AUDIOSYNC 0x06
+
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_BANK_FUNCTIONREG 0x0B // helpfully called 'page nine'
+uint8_t control[8][9] = {
+    {0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0},
+};
+ISSIDeviceStruct *issi_devices[4] = {0, 0, 0, 0};
+
+#ifndef cbi
+#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
+#endif
+
+#ifndef sbi
+#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
+#endif
+
+#define I2C_WRITE 0
+#define F_SCL 400000UL // SCL frequency
+#define Prescaler 1
+#define TWBR_val ((((F_CPU / F_SCL) / Prescaler) - 16 ) / 2)
+
+uint8_t i2c_start(uint8_t address)
+{
+    // reset TWI control register
+    TWCR = 0;
+    // transmit START condition
+    TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
+    // wait for end of transmission
+    while( !(TWCR & (1<<TWINT)) );
+
+    // check if the start condition was successfully transmitted
+    if((TWSR & 0xF8) != TW_START){ return 1; }
+
+    // load slave address into data register
+    TWDR = address;
+    // start transmission of address
+    TWCR = (1<<TWINT) | (1<<TWEN);
+    // wait for end of transmission
+    while( !(TWCR & (1<<TWINT)) );
+
+    // check if the device has acknowledged the READ / WRITE mode
+    uint8_t twst = TW_STATUS & 0xF8;
+    if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return 1;
+
+    return 0;
+}
+
+uint8_t i2c_write(uint8_t data)
+{
+    // load data into data register
+    TWDR = data;
+    // start transmission of data
+    TWCR = (1 << TWINT) | (1 << TWEN);
+    // wait for end of transmission
+    while (!(TWCR & (1 << TWINT)))
+        ;
+
+    if ((TWSR & 0xF8) != TW_MT_DATA_ACK) {
+        return 1;
+    }
+    return 0;
+}
+
+uint8_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length)
+{
+    TWBR = (uint8_t)TWBR_val;
+    if (i2c_start(address | I2C_WRITE))
+        return 1;
+    for (uint16_t i = 0; i < length; i++) {
+        if (i2c_write(data[i]))
+            return 1;
+    }
+    // transmit STOP condition
+    TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
+    return 0;
+}
+
+void setFrame(uint8_t device, uint8_t frame)
+{
+    static uint8_t current_frame = -1;
+    if(current_frame != frame){
+        uint8_t payload[] = {
+            ISSI_ADDR_DEFAULT | device << 1,
+            ISSI_COMMANDREGISTER,
+            frame
+        };
+        TWITransmitData(payload, sizeof(payload), 0, 1);
+    }
+    // static uint8_t current_frame = 0xFF;
+    // if(current_frame == frame){
+    //     // return;
+    // }
+    // uint8_t payload[2] = { ISSI_COMMANDREGISTER, frame };
+    // i2c_transmit(ISSI_ADDR_DEFAULT | device << 1, payload, 2);
+    // current_frame = frame;
+}
+
+void writeRegister8(uint8_t device, uint8_t frame, uint8_t reg, uint8_t data)
+{
+    // Set the frame
+    setFrame(device, frame);
+
+    // Write to the register
+    uint8_t payload[] = {
+        ISSI_ADDR_DEFAULT | device << 1,
+        reg,
+        data
+    };
+    TWITransmitData(payload, sizeof(payload), 0, 1);
+}
+
+void activateLED(uint8_t matrix, uint8_t cx, uint8_t cy, uint8_t pwm)
+{
+    uint8_t device_addr = (matrix & 0x06) >> 1;
+    ISSIDeviceStruct *device = issi_devices[device_addr];
+    if(device == 0){
+        return;
+    }
+    // xprintf("activeLED: %02X %02X %02X %02X\n", matrix, cy, cx, pwm);
+    uint8_t x = cx - 1;  // funciton takes 1 based counts, but we need 0...
+    uint8_t y = cy - 1;  // creating them once for less confusion
+    uint8_t control_reg = (y << 1) | (matrix & 0x01);
+    if(pwm == 0){
+        cbi(device->led_ctrl[control_reg], x);
+        cbi(device->led_blink_ctrl[control_reg], x);
+     }else{
+        sbi(device->led_ctrl[control_reg], x);
+        sbi(device->led_blink_ctrl[control_reg], x);
+    }
+    uint8_t pwm_reg = 0;
+    switch(matrix & 0x01){
+        case 0:
+            pwm_reg = 0x00;
+            break;
+        case 1:
+            pwm_reg = 0x08;
+            break;
+    }
+    pwm_reg += (y << 4) + x;
+    device->led_pwm[pwm_reg] = pwm;
+    device->led_dirty = 1;
+}
+
+void update_issi(uint8_t device_addr, uint8_t blocking)
+{
+    // This seems to take about 6ms
+    ISSIDeviceStruct *device = issi_devices[device_addr];
+    if(device != 0){
+        if(device->fn_dirty){
+            device->fn_dirty = 0;
+            setFrame(device_addr, ISSI_BANK_FUNCTIONREG);
+            TWITransmitData(&device->fn_device_addr, sizeof(device->fn_registers) + 2, 0, 1);
+        }
+        if(device->led_dirty){
+            device->led_dirty = 0;
+            setFrame(device_addr, 0);
+            TWITransmitData(&device->led_device_addr, 0xB6, 0, blocking);
+        }
+    }
+}
+
+void issi_init(void)
+{
+    TWIInit();
+    for(uint8_t device_addr = 0; device_addr < 4; device_addr++){
+        // If this device has been previously allocated, free it
+        if(issi_devices[device_addr] != 0){
+            free(issi_devices[device_addr]);
+        }
+        // Try to shutdown the device, if this fails skip this device
+        writeRegister8(device_addr, ISSI_BANK_FUNCTIONREG, ISSI_REG_SHUTDOWN, 0x00);
+        while (!isTWIReady()){_delay_us(1);}
+        if(TWIInfo.errorCode != 0xFF){
+            xprintf("ISSI init failed %d %02X %02X\n", device_addr, TWIInfo.mode, TWIInfo.errorCode);
+            continue;
+        }
+        // Allocate the device structure - calloc zeros it for us
+        ISSIDeviceStruct *device = (ISSIDeviceStruct *)calloc(sizeof(ISSIDeviceStruct) * 2, 1);
+        issi_devices[device_addr] = device;
+        device->fn_device_addr = ISSI_ADDR_DEFAULT | device_addr << 1;
+        device->fn_register_addr = 0;
+        device->led_device_addr = ISSI_ADDR_DEFAULT | device_addr << 1;
+        device->led_register_addr = 0;
+        // set dirty bits so that all of the buffered data is written out
+        device->fn_dirty = 1;
+        device->led_dirty = 1;
+        update_issi(device_addr, 1);
+        // Set the function register to picture mode
+        // device->fn_reg[ISSI_REG_CONFIG] = ISSI_REG_CONFIG_PICTUREMODE;
+        writeRegister8(device_addr, ISSI_BANK_FUNCTIONREG, ISSI_REG_SHUTDOWN, 0x01);
+    }
+
+    // Shutdown and set all registers to 0
+    // writeRegister8(device_addr, ISSI_BANK_FUNCTIONREG, ISSI_REG_SHUTDOWN, 0x00);
+    // for(uint8_t bank = 0; bank <= 7; bank++){
+    //     for (uint8_t reg = 0x00; reg <= 0xB3; reg++) {
+    //         writeRegister8(device_addr, bank, reg, 0x00);
+    //     }
+    // }
+    // for (uint8_t reg = 0; reg <= 0x0C; reg++) {
+    //     writeRegister8(device_addr, ISSI_BANK_FUNCTIONREG, reg, 0x00);
+    // }
+    // writeRegister8(device_addr, ISSI_BANK_FUNCTIONREG, ISSI_REG_CONFIG, ISSI_REG_CONFIG_PICTUREMODE);
+    // writeRegister8(device_addr, ISSI_BANK_FUNCTIONREG, ISSI_REG_SHUTDOWN, 0x01);
+    // picture mode
+    // writeRegister8(ISSI_BANK_FUNCTIONREG, 0x01, 0x01);
+
+    //Enable blink
+    // writeRegister8(ISSI_BANK_FUNCTIONREG, 0x05, 0x48B);
+
+    //Enable Breath
+
+}
+
+#endif
\ No newline at end of file
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