From ea1fc9bf71819acf931dbfa9b131f74fd854a680 Mon Sep 17 00:00:00 2001
From: matthias wagner <matthias.wagner12@outlook.de>
Date: Sun, 30 Jul 2023 17:11:00 +0200
Subject: [PATCH] dma + pio working at 40hz

---
 src/main.c  | 20 ++++++++++++++------
 src/tft.c   |  8 +++-----
 src/tft.pio |  2 +-
 3 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/src/main.c b/src/main.c
index 70fa9ff..b98541c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -20,10 +20,10 @@ const struct tft_config lcd_config = {
 
 int main()
 {
-	set_sys_clock_khz(100 * 1000, true);
+	set_sys_clock_khz(200 * 1000, true);
 
     uint offset = pio_add_program(lcd_config.pio, &tft_program);
-    tft_program_init(lcd_config.pio, lcd_config.sm, offset, lcd_config.gpio_din, lcd_config.gpio_clk, 10.f);
+    tft_program_init(lcd_config.pio, lcd_config.sm, offset, lcd_config.gpio_din, lcd_config.gpio_clk, 1.f);
 	
 	int dma_chan = dma_claim_unused_channel(true);
 	dma_channel_config c = dma_channel_get_default_config(dma_chan);
@@ -35,15 +35,23 @@ int main()
 		&c,
 		&pio0->txf[lcd_config.sm],
 		NULL,
-		320*480/12,
+		320*480/4,
 		false
 	);
 	dled_start(25);	
 	tft_init(&lcd_config, dma_chan);
 	sleep_ms(100);
-	tft_fill(16000);
- 	dma_channel_wait_for_finish_blocking(dma_chan);
-	while (true);
+	tft_start_pixels(lcd_config.pio, lcd_config.sm);
+	while (true){
+		for(size_t i = 0; i < 8; i++) {
+			tft_fill(0);
+			dma_channel_wait_for_finish_blocking(dma_chan);
+		}
+		for(size_t i = 0; i < 8; i++) {
+			tft_fill(31807);
+			dma_channel_wait_for_finish_blocking(dma_chan);
+		}
+	}
 	return 0;
 }
 void dled_start(uint pin){
diff --git a/src/tft.c b/src/tft.c
index be9b10a..c6a66cc 100644
--- a/src/tft.c
+++ b/src/tft.c
@@ -56,7 +56,7 @@ void tft_init(const struct tft_config* config, int dma_channel) {
 
     gpio_put(tft_cfg.gpio_cs, 1);
     gpio_put(tft_cfg.gpio_rst, 1);
-    //lcd_init(tft_cfg.pio, tft_cfg.sm, st7789_init_seq);
+    lcd_init(tft_cfg.pio, tft_cfg.sm, st7789_init_seq);
     gpio_put(tft_cfg.gpio_bl, 1);
 }
 void tft_fill(uint16_t color) {
@@ -64,10 +64,8 @@ void tft_fill(uint16_t color) {
     uint32_t two = 0;
     two |= color_left;
     two |= color;
-	//tft_start_pixels(tft_cfg.pio, tft_cfg.sm);
-    uint32_t pix_buf[320*480/12]; 
-	size_t i;
-	for(i = 0; i < 320*480/12; i++) {
+    uint32_t pix_buf[320*480/4]; 
+	for(size_t i = 0; i < 320*480/4; i++) {
 		pix_buf[i] = two;
 	}
     dma_channel_set_read_addr(dma_chan, pix_buf, true);
diff --git a/src/tft.pio b/src/tft.pio
index 6a8a534..c9e7df1 100644
--- a/src/tft.pio
+++ b/src/tft.pio
@@ -34,7 +34,7 @@ static inline void tft_program_init(PIO pio, uint sm, uint offset, uint data_pin
     sm_config_set_out_pins(&c, data_pin, 1);
     sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
     sm_config_set_clkdiv(&c, clk_div);
-    sm_config_set_out_shift(&c, false, true, 32);
+    sm_config_set_out_shift(&c, false, true, 8);
     pio_sm_init(pio, sm, offset, &c);
     pio_sm_set_enabled(pio, sm, true);
 }