Add debug_over_spi.[ch]

left/src/debug_over_spi.c

@@ -0,0 +1,61 @@
+#include "debug_over_spi.h"
+#include "config.h"
+#include "fsl_gpio.h"
+
+#ifdef DEBUG_OVER_SPI
+
+#define EXAMPLE_SPI_MASTER (SPI0)
+#define EXAMPLE_SPI_MASTER_SOURCE_CLOCK (kCLOCK_BusClk)
+
+#define BUFFER_SIZE (64)
+static uint8_t srcBuff[BUFFER_SIZE];
+
+static spi_transfer_t xfer = {0};
+static spi_master_config_t userConfig;
+spi_master_handle_t handle;
+
+static volatile bool masterFinished = false;
+
+#endif
+
+static void masterCallback(SPI_Type *base, spi_master_handle_t *masterHandle, status_t status, void *userData)
+{
+    masterFinished = true;
+}
+
+void DebugOverSpi_Init(void)
+{
+#ifdef DEBUG_OVER_SPI
+
+    CLOCK_EnableClock(DEBUG_OVER_SPI_MOSI_CLOCK);
+    CLOCK_EnableClock(DEBUG_OVER_SPI_SCK_CLOCK);
+
+    PORT_SetPinMux(DEBUG_OVER_SPI_MOSI_PORT, DEBUG_OVER_SPI_MOSI_PIN, kPORT_MuxAlt3);
+    PORT_SetPinMux(DEBUG_OVER_SPI_SCK_PORT, DEBUG_OVER_SPI_SCK_PIN, kPORT_MuxAlt3);
+
+    GPIO_PinInit(DEBUG_OVER_SPI_MOSI_GPIO, DEBUG_OVER_SPI_MOSI_PIN, &(gpio_pin_config_t){kGPIO_DigitalOutput, 0});
+    GPIO_PinInit(DEBUG_OVER_SPI_SCK_GPIO, DEBUG_OVER_SPI_SCK_PIN, &(gpio_pin_config_t){kGPIO_DigitalOutput, 0});
+
+    GPIO_SetPinsOutput(DEBUG_OVER_SPI_MOSI_GPIO, 1U << DEBUG_OVER_SPI_MOSI_PIN);
+    GPIO_SetPinsOutput(DEBUG_OVER_SPI_SCK_GPIO, 1U << DEBUG_OVER_SPI_SCK_PIN);
+
+    SPI_MasterGetDefaultConfig(&userConfig);
+    uint32_t srcFreq = CLOCK_GetFreq(EXAMPLE_SPI_MASTER_SOURCE_CLOCK);
+    SPI_MasterInit(EXAMPLE_SPI_MASTER, &userConfig, srcFreq);
+
+    SPI_MasterTransferCreateHandle(EXAMPLE_SPI_MASTER, &handle, masterCallback, NULL);
+#endif
+}
+
+void DebugOverSpi_Send(uint8_t *tx, uint8_t len)
+{
+#ifdef DEBUG_OVER_SPI
+//    if (masterFinished) {
+        masterFinished = false;
+        memcpy(srcBuff, tx, MIN(BUFFER_SIZE, len));
+        xfer.txData = srcBuff;
+        xfer.dataSize = len;
+        SPI_MasterTransferNonBlocking(EXAMPLE_SPI_MASTER, &handle, &xfer);
+//    }
+#endif
+}