1 files changed, 82 insertions, 0 deletions
diff --git a/sam/applications/sam_e1/idt82v2081_asf.c b/sam/applications/sam_e1/idt82v2081_asf.c
new file mode 100644
index 00000000..753dfa6e
--- /dev/null
+++ b/sam/applications/sam_e1/idt82v2081_asf.c
@@ -0,0 +1,82 @@
+#include <stdint.h>
+#include <asf.h>
+
+#include "idt82v2081.h"
+#include "idt82v2081_asf.h"
+
+/* Adaption layer between idt82 driver and Atmel ASF SPI driver */
+
+/*! reverse the bit order in a byte
+ *  \param[in] x 8bit input value
+ *  \returns 8bit value where bits order has been reversed
+ *
+ * See Chapter 7 "Hackers Delight"
+ */
+static uint32_t osmo_revbytebits_8(uint8_t x)
+{
+	x = (x & 0x55) <<  1 | (x & 0xAA) >>  1;
+	x = (x & 0x33) <<  2 | (x & 0xCC) >>  2;
+	x = (x & 0x0F) <<  4 | (x & 0xF0) >>  4;
+
+	return x;
+}
+
+#define B_READ	(1 << 5)
+
+static struct spi_device g_spidev = {
+	.id = 1,
+};
+
+/* backend function for core idt82 driver */
+int idt82_reg_read(struct idt82 *idt, uint8_t reg)
+{
+	uint8_t req[2] = { (reg & 0x1F) | B_READ, 0 };
+	uint8_t res[2];
+
+	req[0] = osmo_revbytebits_8(req[0]);
+	req[1] = osmo_revbytebits_8(req[1]);
+
+	spi_select_device(idt->priv, &g_spidev);
+#if 0
+	spi_write_packet(idt->priv, (reg & 0x1F) | B_READ, 16);
+	while (!SPI_IsFinished(idt->priv));
+	spi_read_packet(idt->priv, &res, 16);
+#else
+	spi_transceive_packet(idt->priv, req, res, sizeof(res));
+#endif
+	spi_deselect_device(idt->priv, &g_spidev);
+	res[1] = osmo_revbytebits_8(res[1]);
+
+	return res[1];
+}
+/* backend function for core idt82 driver */
+int idt82_reg_write(struct idt82 *idt, uint8_t reg, uint8_t val)
+{
+	uint8_t req[2] = { (reg & 0x1F), val };
+	req[0] = osmo_revbytebits_8(req[0]);
+	req[1] = osmo_revbytebits_8(req[1]);
+
+	spi_select_device(idt->priv, &g_spidev);
+	spi_write_packet(idt->priv, req, sizeof(req));
+	spi_deselect_device(idt->priv, &g_spidev);
+
+	return 0;
+}
+
+/* initialize the SPI interface to the IDT82 */
+int idt82_asf_init(struct idt82 *idt, Spi *spi, uint8_t cs)
+{
+	g_spidev.id = cs;
+	idt->priv = spi;
+
+	printf("%s: spi=%p, cs=%u\n\r", __func__, spi, cs);
+
+	pmc_enable_periph_clk(ID_SPI);
+
+	spi_master_init(idt->priv);
+	spi_master_setup_device(idt->priv, &g_spidev, SPI_MODE_0, 100000, cs);
+	//spi_configure_cs_behavior(idt->priv, g_spidev.id, SPI_CS_RISE_NO_TX);
+	spi_enable(idt->priv);
+
+	return 0;
+}