From 111319e22dbce44a338dffa35a0491a8562cc9c9 Mon Sep 17 00:00:00 2001
From: cuu <gnubsd@me.com>
Date: Sun, 27 Apr 2025 15:32:55 +0800
Subject: [PATCH] add set kbd backlight via i2c example in picocalc_helloworld

---
 Code/picocalc_helloworld/i2ckbd/i2ckbd.c | 28 ++++++++++++++++++++++++
 Code/picocalc_helloworld/i2ckbd/i2ckbd.h |  3 +++
 Code/picocalc_helloworld/main.c          | 17 ++++++++++++++
 3 files changed, 48 insertions(+)

diff --git a/Code/picocalc_helloworld/i2ckbd/i2ckbd.c b/Code/picocalc_helloworld/i2ckbd/i2ckbd.c
index 78d0367..51bfb32 100644
--- a/Code/picocalc_helloworld/i2ckbd/i2ckbd.c
+++ b/Code/picocalc_helloworld/i2ckbd/i2ckbd.c
@@ -77,6 +77,34 @@ int read_battery() {
         return -1;
     }
 
+    if (buff != 0) {
+        return buff;
+    }
+    return -1;
+}
+
+int set_kbd_backlight(uint8_t val){
+    int retval;
+    uint16_t buff = 0;
+    unsigned char msg[2];
+    msg[0] = 0x0A;
+    msg[1] = val;
+    bitSet(msg[0],7);
+
+    if (i2c_inited == 0) return -1;
+
+    retval = i2c_write_timeout_us(I2C_KBD_MOD, I2C_KBD_ADDR, msg, 2, false, 500000);
+    if (retval == PICO_ERROR_GENERIC || retval == PICO_ERROR_TIMEOUT) {
+        printf("read_battery i2c write error\n");
+        return -1;
+    }
+    sleep_ms(16);
+    retval = i2c_read_timeout_us(I2C_KBD_MOD, I2C_KBD_ADDR, (unsigned char *) &buff, 2, false, 500000);
+    if (retval == PICO_ERROR_GENERIC || retval == PICO_ERROR_TIMEOUT) {
+        printf("read_battery i2c read error read\n");
+        return -1;
+    }
+
     if (buff != 0) {
         return buff;
     }
diff --git a/Code/picocalc_helloworld/i2ckbd/i2ckbd.h b/Code/picocalc_helloworld/i2ckbd/i2ckbd.h
index 0a162b0..b39d7c1 100644
--- a/Code/picocalc_helloworld/i2ckbd/i2ckbd.h
+++ b/Code/picocalc_helloworld/i2ckbd/i2ckbd.h
@@ -16,7 +16,10 @@
 void init_i2c_kbd();
 int read_i2c_kbd();
 int read_battery();
+int set_kbd_backlight(uint8_t);
 
 #define bitRead(value, bit) (((value) >> (bit)) & 0x01)
 #define bitClear(value, bit) ((value) &= ~(1 << (bit)))
+#define bitSet(value, bit) ((value) |= (1 << (bit)))
+
 #endif
\ No newline at end of file
diff --git a/Code/picocalc_helloworld/main.c b/Code/picocalc_helloworld/main.c
index f2d2a76..5c48d17 100644
--- a/Code/picocalc_helloworld/main.c
+++ b/Code/picocalc_helloworld/main.c
@@ -220,6 +220,16 @@ void test_battery(){
     lcd_print_string(buf);
 }
 
+void test_kbd_backlight(uint8_t val) {
+    char buf[64];
+    int kbd_backlight = set_kbd_backlight(val);
+    kbd_backlight = kbd_backlight>>8;
+
+    sprintf(buf, "kbd backlight %d\n", kbd_backlight);
+    printf("%s", buf);
+    lcd_print_string(buf);
+}
+
 int main() {
     set_sys_clock_khz(133000, true);
     stdio_init_all();
@@ -252,6 +262,13 @@ int main() {
 
     sleep_ms(2000);
     test_battery();
+    test_kbd_backlight(50);
+    sleep_ms(1000);
+    test_kbd_backlight(100);
+    sleep_ms(1000);
+    test_kbd_backlight(255);
+    sleep_ms(1000);
+    test_kbd_backlight(0);
     while (1) {
         int c = lcd_getc(0);
         if(c != -1 && c > 0) {