reduced DAC size

halconf.h

@@ -59,7 +59,7 @@
  * @brief   Enables the DAC subsystem.
  */
 #if !defined(HAL_USE_DAC) || defined(__DOXYGEN__)
-#define HAL_USE_DAC                 TRUE
+#define HAL_USE_DAC                 FALSE
 #endif
 
 /**

ili9341.c

@@ -1,5 +1,4 @@
 /*
- * Copyright (c) 2019-2020, written by DiSlord dislordlive@gmail.com
  * All rights reserved.
  *
  * This is free software; you can redistribute it and/or modify
@@ -524,35 +523,23 @@ static const uint8_t ili9341_init_seq[] = {
 #endif
 
 #ifdef __LCD_BRIGHTNESS__
-#if HAL_USE_DAC == FALSE
-#error "Need set HAL_USE_DAC in halconf.h for use __LCD_BRIGHTNESS__"
+#if HAL_USE_DAC == TRUE
+#error "Need to disable HAL_USE_DAC in halconf.h for use __LCD_BRIGHTNESS__"
 #endif
 
-static const DACConfig dac1cfg1 = {
-  init:         0,
-  datamode:     DAC_DHRM_12BIT_RIGHT
-};
-
-static void lcd_initBrightness(void){
-  dacStart(&DACD2, &dac1cfg1);
-}
 
 #define BRIGHTNESS_MIN_LEVEL    0
-#define BRIGHTNESS_MAX_LEVEL 3300
+#define BRIGHTNESS_MAX_LEVEL 4000
 // Brightness control range 0 - 100
+// DAC value range 0 - 4095 (0 to vRef in Volt)
 void lcd_setBrightness(uint16_t b){
   b = BRIGHTNESS_MIN_LEVEL + b*((BRIGHTNESS_MAX_LEVEL-BRIGHTNESS_MIN_LEVEL)/100);
-  dacPutChannelX(&DACD2, 0, b);
+  DAC->DHR12R2 = b;
 }
-#else
-#define lcd_initBrightness()
 #endif
 
 void ili9341_init(void)
 {
-  // Init Brightness if LCD support
-  lcd_initBrightness();
-
   LCD_DC_DATA;
   LCD_RESET_ASSERT;
   chThdSleepMilliseconds(10);

main.c

@@ -508,15 +508,15 @@ usage:
 
 VNA_SHELL_FUNCTION(cmd_dac)
 {
-  int value;
+  uint32_t value;
   if (argc != 1) {
     shell_printf("usage: dac {value(0-4095)}\r\n"\
                  "current value: %d\r\n", config.dac_value);
     return;
   }
-  value = my_atoui(argv[0]);
+  value = my_atoui(argv[0]) & 0xFFF;
   config.dac_value = value;
-  dacPutChannelX(&DACD2, 0, value);
+  DAC->DHR12R2 = value;
 }
 
 VNA_SHELL_FUNCTION(cmd_saveconfig)
@@ -2284,11 +2284,6 @@ THD_FUNCTION(myshellThread, p)
 }
 #endif
 
-static const DACConfig dac1cfg1 = {
-  init:         0,
-  datamode:     DAC_DHRM_12BIT_RIGHT
-};
-
 #pragma GCC pop_options
 
 static const GPTConfig gpt4cfg = {
@@ -2310,6 +2305,9 @@ void my_microsecond_delay(int t)
  * Profile stack usage (enable threads command by def ENABLE_THREADS_COMMAND) show:
  *Stack maximum usage = 472 bytes (need test more and run all commands), free stack = 40 bytes
  */
+static void dac_init(void){
+  rccEnableDAC1(false); // Enable DAC1
+}
 
 int main(void)
 {
@@ -2463,13 +2461,14 @@ int main(void)
    * Set LCD display brightness (use DAC2 for control)
    * Starting DAC1 driver, setting up the output pin as analog as suggested by the Reference Manual.
    */
+  dac_init();
+  DAC->CR|= DAC_CR_EN1 | DAC_CR_EN2; // Use DAC: CH1 and CH2
   #ifdef  __LCD_BRIGHTNESS__
     lcd_setBrightness(config._brightness);
   #else
-    dacStart(&DACD2, &dac1cfg1);
-    dacPutChannelX(&DACD2, 0, config.dac_value);
+    DAC->DHR12R2 = config.dac_value; // Setup DAC: CH2 value
   #endif
-  dacStart(&DACD1, &dac1cfg1);
+  DAC->DHR12R1 = 0;                  // Setup DAC: CH1 value
 
   chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO-1, Thread1, NULL);
 

si4432.c

@@ -767,7 +767,7 @@ void SI4432_Listen(int s)
       } else
         count++;
       v = max - v;
-      dacPutChannelX(&DACD1, 0, dBm_to_volt[v] << 4);
+      DAC->DHR12R1 = dBm_to_volt[v] << 4; // Use DAC: CH1 and put 12 bit right aligned value
     } while(operation_requested == OP_NONE);
   count = 0;
 //   dacPutChannelX(&DACD1, 0, 0);

si4468.c

@@ -1382,7 +1382,7 @@ void SI4432_Listen(int s)
       } else
         count++;
       v = max - v;
-      dacPutChannelX(&DACD1, 0, dBm_to_volt[v] << 4);
+      DAC->DHR12R1 = dBm_to_volt[v] << 4; // Use DAC: CH1 and put 12 bit right aligned value
     } while(operation_requested == OP_NONE);
   count = 0;
 //  dacPutChannelX(&DACD2, 0, 0);