Don't bother with DMA since we're busy-waiting

4 files changed, 30 insertions, 41 deletions

diff --git a/laser-tag software/CMakeLists.txt b/laser-tag software/CMakeLists.txt
index 1861b60..92bc6d1 100644
--- a/laser-tag software/CMakeLists.txt
+++ b/laser-tag software/CMakeLists.txt
@@ -97,7 +97,7 @@ ADD_EXECUTABLE(hello_world
     "${ProjDirPath}/../KSDK_1.2.0/platform/drivers/src/flexio/fsl_flexio_irq.c"

     "${ProjDirPath}/../KSDK_1.2.0/platform/drivers/src/lptmr/fsl_lptmr_irq.c"

     "${ProjDirPath}/../KSDK_1.2.0/platform/drivers/src/lpuart/fsl_lpuart_irq.c"

-    "${ProjDirPath}/../KSDK_1.2.0/platform/drivers/src/spi/fsl_spi_dma_irq.c"

+    "${ProjDirPath}/../KSDK_1.2.0/platform/drivers/src/spi/fsl_spi_irq.c"

     "${ProjDirPath}/main.c"

     "${ProjDirPath}/epaper.c"

     "${ProjDirPath}/text.c"

diff --git a/laser-tag software/epaper.c b/laser-tag software/epaper.c
index a1c6391..fb4d8ef 100644
--- a/laser-tag software/epaper.c
+++ b/laser-tag software/epaper.c
@@ -1,6 +1,6 @@
 #include "epaper.h"
 #include "fsl_gpio_driver.h"
-#include "fsl_spi_dma_master_driver.h"
+#include "fsl_spi_master_driver.h"
 
 typedef enum {       /* Image pixel -> Display pixel */
     EPD_compensate,  /* B -> W, W -> B (Current Image) */
@@ -19,7 +19,7 @@ static const gpio_output_pin_user_config_t pinCS = {
     .config.outputLogic = 1,
 };
 
-static const spi_dma_master_user_config_t spiConfig = {
+static const spi_master_user_config_t spiConfig = {
     .bitsPerSec = 2000000, /* 2 MHz, max is 20 MHz */
     .polarity = kSpiClockPolarity_ActiveHigh,
     .phase = kSpiClockPhase_FirstEdge,
@@ -35,8 +35,7 @@ static const int LINES_PER_DISPLAY = 128;
 static const int BYTES_PER_SCAN = 128 / 4 / 2;
 static const int BYTES_PER_LINE = 232 / 8;
 
-static spi_dma_master_state_t spiState;
-static uint32_t dma_timeout;
+static spi_master_state_t spiState;
 
 void EPD_Init()
 {
@@ -50,31 +49,26 @@ void EPD_Init()
     GPIO_DRV_OutputPinInit(&pinCS);
 }
 
-void EPD_Tick()
-{
-    if (!dma_timeout) {
-        return;
-    }
-    if (dma_timeout == 1) {
-        SPI_DRV_DmaMasterAbortTransfer(1);
-        return;
-    }
-    dma_timeout--;
-    return;
-}
-
-spi_status_t SPI_Transfer(const uint8_t *tx, uint8_t *rx, size_t count)
+static spi_status_t SPI_Transfer(const uint8_t *tx, uint8_t *rx, size_t count)
 {
     spi_status_t rc;
 
-    dma_timeout = (count + 127) / 128 + 1;
-    rc = SPI_DRV_DmaMasterTransferBlocking(1, NULL, tx, rx, count,
-            kSpiDmaWaitForever);
-    dma_timeout = 0;
+    rc = SPI_DRV_MasterTransfer(1, NULL, tx, rx, count);
+    if (rc != kStatus_SPI_Success) {
+        return rc;
+    }
+    int i, timeout = (count + 127) / 128 + 1;
+    for (i = 0; i < timeout; ++i) {
+        rc = SPI_DRV_MasterGetTransferStatus(1, NULL);
+        if (rc == kStatus_SPI_Success) {
+            return rc;
+        }
+    }
     return rc;
 }
 
-void EPD_WriteCommandBuffer(uint8_t index, const uint8_t *data, size_t length)
+static void EPD_WriteCommandBuffer(uint8_t index, const uint8_t *data,
+        size_t length)
 {
     uint8_t tx[3] = { 0x70, index, 0x72 };
 
@@ -87,12 +81,12 @@ void EPD_WriteCommandBuffer(uint8_t index, const uint8_t *data, size_t length)
     GPIO_DRV_WritePinOutput(pinCS.pinName, 1);
 }
 
-void EPD_WriteCommandByte(uint8_t index, uint8_t data)
+static void EPD_WriteCommandByte(uint8_t index, uint8_t data)
 {
     EPD_WriteCommandBuffer(index, &data, 1);
 }
 
-uint8_t EPD_ReadCommand(uint8_t index)
+static uint8_t EPD_ReadCommand(uint8_t index)
 {
     uint8_t tx[4] = { 0x70, index, 0x73, 0x00 };
     uint8_t rx[2];
@@ -106,7 +100,7 @@ uint8_t EPD_ReadCommand(uint8_t index)
     return rx[1];
 }
 
-uint8_t EPD_ReadCogID()
+static uint8_t EPD_ReadCogID()
 {
     uint8_t tx[2] = { 0x71, 0x00 };
     uint8_t rx[2];
@@ -117,7 +111,7 @@ uint8_t EPD_ReadCogID()
     return rx[1];
 }
 
-void EPD_Delay(uint32_t ms)
+static void EPD_Delay(uint32_t ms)
 {
     for (; ms > 0; --ms) {
         /* XXX This is really stupid */
@@ -126,7 +120,8 @@ void EPD_Delay(uint32_t ms)
     }
 }
 
-void EPD_line(int line, const uint8_t *data, uint8_t fixed_value, EPD_stage stage)
+static void EPD_line(int line, const uint8_t *data, uint8_t fixed_value,
+        EPD_stage stage)
 {
     size_t len = BYTES_PER_SCAN * 2 + BYTES_PER_LINE * 2 + 1;
     uint8_t buf[len], *p = buf;
@@ -189,7 +184,7 @@ void EPD_line(int line, const uint8_t *data, uint8_t fixed_value, EPD_stage stag
     EPD_WriteCommandByte(0x02, 0x07);
 }
 
-void EPD_frame(const uint8_t *data, uint8_t fixed_value, EPD_stage stage)
+static void EPD_frame(const uint8_t *data, uint8_t fixed_value, EPD_stage stage)
 {
     int i;
     if (data) {
@@ -203,7 +198,8 @@ void EPD_frame(const uint8_t *data, uint8_t fixed_value, EPD_stage stage)
     }
 }
 
-void EPD_frame_repeat(const uint8_t *data, uint8_t fixed_value, EPD_stage stage)
+static void EPD_frame_repeat(const uint8_t *data, uint8_t fixed_value,
+        EPD_stage stage)
 {
     /* TODO this needs to repeat for about 630ms */
     int i;
@@ -217,9 +213,9 @@ int EPD_Draw(const uint8_t *old_image, const uint8_t *new_image)
     int rc = 0;
 
     /* Configure DMA channel */
-    SPI_DRV_DmaMasterInit(1, &spiState);
+    SPI_DRV_MasterInit(1, &spiState);
     uint32_t calculatedBaudRate;
-    SPI_DRV_DmaMasterConfigureBus(1, &spiConfig, &calculatedBaudRate);
+    SPI_DRV_MasterConfigureBus(1, &spiConfig, &calculatedBaudRate);
 
     /* read the COG ID */
     uint8_t id = EPD_ReadCogID();
@@ -333,7 +329,7 @@ int EPD_Draw(const uint8_t *old_image, const uint8_t *new_image)
     GPIO_DRV_WritePinOutput(pinDischarge.pinName, 0);
 
 out:
-    SPI_DRV_DmaMasterDeinit(1);
+    SPI_DRV_MasterDeinit(1);
     return rc;
 }
 
diff --git a/laser-tag software/epaper.h b/laser-tag software/epaper.h
index e72a74d..26e1815 100644
--- a/laser-tag software/epaper.h
+++ b/laser-tag software/epaper.h
@@ -5,6 +5,5 @@
 
 void EPD_Init();
 int EPD_Draw(const uint8_t *old_image, const uint8_t *new_image);
-void EPD_Tick();
 
 #endif
diff --git a/laser-tag software/main.c b/laser-tag software/main.c
index de48d95..0dfbac2 100644
--- a/laser-tag software/main.c
+++ b/laser-tag software/main.c
@@ -324,9 +324,6 @@ static void lptmr_call_back(void)
         }
         blank_led--;
     }
-
-    /* kick EPD driver every once in a while */
-    EPD_Tick();
 }
 
 /* Play music using the PIT timer */
@@ -586,9 +583,6 @@ int main (void)
     }
     blank_led = 30;
 
-    /* Deinit so we can mess around on the bus pirate */
-    //EPD_Deinit();
-
     /* We're done, everything else is triggered through interrupts */
     for(;;) {
         if (cue_next_image) {