From ff0ba8e4dfc9dbdb25acfc43c3e72af8aa098aca Mon Sep 17 00:00:00 2001
From: jaseg <git@jaseg.net>
Date: Tue, 30 May 2017 19:32:49 +0200
Subject: fw: Basic dimming working

---
 olsndot/firmware/main.c | 111 +++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 101 insertions(+), 10 deletions(-)

diff --git a/olsndot/firmware/main.c b/olsndot/firmware/main.c
index 4e26200..e4b3935 100644
--- a/olsndot/firmware/main.c
+++ b/olsndot/firmware/main.c
@@ -7,6 +7,11 @@
  * Part number: STM32F030F4C6
  */
 
+#define NBITS 12
+void do_transpose(void);
+uint32_t brightness[8];
+volatile uint8_t brightness_by_bit[NBITS];
+
 int main(void) {
     RCC->CR |= RCC_CR_HSEON;
     while (!(RCC->CR&RCC_CR_HSERDY));
@@ -74,7 +79,7 @@ int main(void) {
     TIM1->SMCR = 0;
     TIM1->DIER = 0;
 
-    TIM1->PSC = 4; // debug
+    TIM1->PSC = 1; // debug
     /* CH2 - clear/!MR, CH3 - strobe/STCP */
     TIM1->CCR2 = 1;
     TIM1->RCR = 0;
@@ -92,16 +97,100 @@ int main(void) {
 
     TIM1->EGR |= TIM_EGR_UG;
 
-    for (;;) {
-        GPIOA->ODR ^= GPIO_ODR_6;
-        LL_mDelay(1);
+    while (42) {
+        /*
+        for (uint8_t i=0; i<8; i++) {
+            brightness[1] = brightness[5] = i;
+            brightness[2] = brightness[6] = 0;
+            brightness[3] = brightness[7] = 0;
+            do_transpose();
+            LL_mDelay(500);
+        }
+        for (uint8_t i=0; i<8; i++) {
+            brightness[1] = brightness[5] = 0;
+            brightness[2] = brightness[6] = i;
+            brightness[3] = brightness[7] = 0;
+            do_transpose();
+            LL_mDelay(500);
+        }
+        for (uint8_t i=0; i<8; i++) {
+            brightness[1] = brightness[5] = 0;
+            brightness[2] = brightness[6] = 0;
+            brightness[3] = brightness[7] = i;
+            do_transpose();
+            LL_mDelay(500);
+        }
+        for (uint8_t i=0; i<8; i++) {
+            brightness[1] = brightness[5] = i;
+            brightness[2] = brightness[6] = i;
+            brightness[3] = brightness[7] = i;
+            do_transpose();
+            LL_mDelay(500);
+        }
+    }
+    {
+    */
+        for (uint32_t i=0; i<6; i++) {
+            for (uint32_t j=0; j<(1<<NBITS); j++) {
+                GPIOA->ODR ^= GPIO_ODR_6;
+                switch (i) {
+                    case 0:
+                    brightness[1] = brightness[5] = (1<<NBITS)-1;
+                    brightness[2] = brightness[6] = 0;
+                    brightness[3] = brightness[7] = j;
+                    break;
+                    case 1:
+                    brightness[1] = brightness[5] = (1<<NBITS)-1-j;
+                    brightness[2] = brightness[6] = 0;
+                    brightness[3] = brightness[7] = (1<<NBITS)-1;
+                    break;
+                    case 2:
+                    brightness[1] = brightness[5] = 0;
+                    brightness[2] = brightness[6] = j;
+                    brightness[3] = brightness[7] = (1<<NBITS)-1;
+                    break;
+                    case 3:
+                    brightness[1] = brightness[5] = 0;
+                    brightness[2] = brightness[6] = (1<<NBITS)-1;
+                    brightness[3] = brightness[7] = (1<<NBITS)-1-j;
+                    break;
+                    case 4:
+                    brightness[1] = brightness[5] = j;
+                    brightness[2] = brightness[6] = (1<<NBITS)-1;
+                    brightness[3] = brightness[7] = 0;
+                    break;
+                    case 5:
+                    brightness[1] = brightness[5] = (1<<NBITS)-1;
+                    brightness[2] = brightness[6] = (1<<NBITS)-1-j;
+                    brightness[3] = brightness[7] = 0;
+                    break;
+                }
+                do_transpose();
+                LL_mDelay(1);
+            }
+        }
     }
 }
 
-#define NBITS 4
-uint8_t brightness_by_bit[NBITS] = {
-    0x11, 0x22, 0x44, 0x88
-};
+uint32_t brightness[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+volatile uint8_t brightness_by_bit[NBITS] = { 0 };
+
+void do_transpose(void) {
+    for (uint32_t i=0; i<NBITS; i++) {
+        uint8_t bv = 0;
+        uint32_t mask = 1<<i;
+        for (uint32_t j=0; j<8; j++) {
+            if (brightness[j] & mask)
+            bv |= 1<<j;
+        }
+        brightness_by_bit[i] = bv;
+    }
+}
+
+/*
+ * 460ns
+ * 720ns
+ */
 
 /*
  * 1.00us
@@ -115,12 +204,14 @@ uint8_t brightness_by_bit[NBITS] = {
  */
 void TIM1_BRK_UP_TRG_COM_IRQHandler(void) {
     static uint32_t idx = 0;
-    idx = (idx+1)&7;
+    idx++;
+    if (idx >= NBITS)
+        idx = 0;
 
     GPIOA->ODR ^= GPIO_ODR_4;
     TIM1->CCMR1 = (4<<TIM_CCMR1_OC2M_Pos); // | TIM_CCMR1_OC2PE;
 
-    SPI1->DR = 0x88<<8;
+    SPI1->DR = brightness_by_bit[idx]<<8;
     while (SPI1->SR & SPI_SR_BSY);
 
     const uint32_t period_base = 4; /* 1us */
-- 
cgit