From c7cce36c6c395517e1f39bd915f93f26fa52783b Mon Sep 17 00:00:00 2001
From: David Barksdale <amatus@amatus.name>
Date: Wed, 27 Jan 2016 22:28:54 -0600
Subject: Some initial progress

I'm not getting the right response to command 0x71 and I think it has
something to do with initializing the display (reset). I can't seem to
get PTA20 to go low.
---
 laser-tag software/CMakeLists.txt |  1 +
 laser-tag software/epaper.c       | 66 +++++++++++++++++++++++++++++++++++++++
 laser-tag software/main.c         | 14 +++++++--
 3 files changed, 79 insertions(+), 2 deletions(-)
 create mode 100644 laser-tag software/epaper.c

diff --git a/laser-tag software/CMakeLists.txt b/laser-tag software/CMakeLists.txt
index 86f77de..7203805 100755
--- a/laser-tag software/CMakeLists.txt	
+++ b/laser-tag software/CMakeLists.txt	
@@ -99,6 +99,7 @@ ADD_EXECUTABLE(hello_world
     "${ProjDirPath}/../KSDK_1.2.0/platform/drivers/src/lpuart/fsl_lpuart_irq.c"
     "${ProjDirPath}/../KSDK_1.2.0/platform/drivers/src/spi/fsl_spi_irq.c"
     "${ProjDirPath}/main.c"
+    "${ProjDirPath}/epaper.c"
 )
 SET_TARGET_PROPERTIES(hello_world PROPERTIES OUTPUT_NAME "hello_world.elf")
 
diff --git a/laser-tag software/epaper.c b/laser-tag software/epaper.c
new file mode 100644
index 0000000..d4e7d81
--- /dev/null
+++ b/laser-tag software/epaper.c	
@@ -0,0 +1,66 @@
+#include "fsl_gpio_driver.h"
+#include "fsl_spi_master_driver.h"
+
+static const gpio_output_pin_user_config_t pinReset = {
+    .pinName = GPIO_MAKE_PIN(GPIOA_IDX, 20),
+    .config.outputLogic = 0, // XXX
+};
+
+static const gpio_output_pin_user_config_t pinDischarge = {
+    .pinName = GPIO_MAKE_PIN(GPIOA_IDX, 19),
+    .config.outputLogic = 0,
+};
+
+static const spi_master_user_config_t spiConfig = {
+    .bitsPerSec = 4000000, /* 4 MHz, max is 20 MHz */
+    .polarity = kSpiClockPolarity_ActiveHigh,
+    .phase = kSpiClockPhase_FirstEdge,
+    .direction = kSpiMsbFirst,
+    .bitCount = kSpi8BitMode,
+};
+
+static spi_master_state_t spiState;
+
+extern void led(uint8_t red, uint8_t green, uint8_t blue);
+
+void EPD_Init()
+{
+    PORT_HAL_SetMuxMode(g_portBase[GPIOA_IDX], 19, kPortMuxAsGpio);
+    PORT_HAL_SetMuxMode(g_portBase[GPIOA_IDX], 20, kPortMuxAsGpio);
+    PORT_HAL_SetMuxMode(g_portBase[GPIOD_IDX], 4, kPortMuxAlt2);
+    PORT_HAL_SetMuxMode(g_portBase[GPIOD_IDX], 5, kPortMuxAlt2);
+    PORT_HAL_SetMuxMode(g_portBase[GPIOD_IDX], 6, kPortMuxAlt2);
+    PORT_HAL_SetMuxMode(g_portBase[GPIOD_IDX], 7, kPortMuxAlt2);
+    GPIO_DRV_OutputPinInit(&pinReset);
+    GPIO_DRV_OutputPinInit(&pinDischarge);
+    SPI_DRV_MasterInit(1, &spiState);
+    uint32_t calculatedBaudRate;
+    SPI_DRV_MasterConfigureBus(1, &spiConfig, &calculatedBaudRate);
+}
+
+void EPD_Draw()
+{
+    /* Reset */
+    GPIO_DRV_WritePinOutput(pinReset.pinName, 0);
+    int i;
+    for(i = 0; i < 0xffff; ++i);
+    //GPIO_DRV_WritePinOutput(pinReset.pinName, 1);
+
+    uint8_t tx[2], rx[2];
+
+    tx[0] = 0x71;
+    tx[1] = 0x00;
+    SPI_DRV_MasterTransferBlocking(1, NULL, tx, rx, 2, 1);
+    SPI_DRV_MasterTransferBlocking(1, NULL, tx, rx, 2, 1);
+    if ((rx[1] & 0x0f) != 0x02) {
+        led(0xff, 0x00, 0x00);
+    } else {
+        led(0x00, 0xff, 0x00);
+    }
+
+    /* Shutdown */
+    GPIO_DRV_WritePinOutput(pinDischarge.pinName, 1);
+    GPIO_DRV_WritePinOutput(pinDischarge.pinName, 0);
+}
+
+/* vim: set expandtab ts=4 sw=4: */
diff --git a/laser-tag software/main.c b/laser-tag software/main.c
index 53a381e..a2dc21d 100755
--- a/laser-tag software/main.c	
+++ b/laser-tag software/main.c	
@@ -235,17 +235,21 @@ static flexio_shifter_config_t g_shifterConfig = {
     .sstart = kFlexioShifterStartBitDisabledLoadDataOnEnable,
 };
 
+
+extern void EPD_Init();
+extern void EPD_Draw();
+
 ///////
 // Code
 
 static cmp_state_t g_cmpState;
-static dma_channel_t g_dacChan, g_fioChan;
+static dma_channel_t g_fioChan;
 static lpuart_state_t g_lpuartState;
 static uint8_t rxBuff[1];
 static uint32_t shift0_buf[3];
 static uint32_t blank_led;
 
-static void led(uint8_t red, uint8_t green, uint8_t blue)
+void led(uint8_t red, uint8_t green, uint8_t blue)
 {
     FLEXIO_Type *fiobase = g_flexioBase[0];
     uint32_t color = (green << 16) | (red << 8) | blue;
@@ -521,6 +525,12 @@ int main (void)
     /* Blank LED just in case, saves power */
     led(0x00, 0x00, 0x00);
 
+    /* Init e-paper display */
+    EPD_Init();
+
+    /* Draw something */
+    EPD_Draw();
+
     /* We're done, everything else is triggered through interrupts */
     for(;;) {
 #ifndef DEBUG
-- 
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