sdk:examples: add i2c_slave

Signed-off-by: liangkangnan <liangkangnan@163.com>

sdk/examples/i2c_slave/.gitignore

@@ -0,0 +1,8 @@
+# Object files
+*.o
+*.ko
+*.obj
+*.bin
+*.dump
+*.mem
+i2c_slave

sdk/examples/i2c_slave/Makefile

@@ -0,0 +1,20 @@
+RISCV_ARCH := rv32im
+RISCV_ABI := ilp32
+RISCV_MCMODEL := medlow
+
+
+TARGET = i2c_slave
+
+
+#CFLAGS += -DSIMULATION
+#CFLAGS += -O2
+#ASM_SRCS +=
+#LDFLAGS +=
+#INCLUDES += -I.
+
+C_SRCS := \
+	main.c \
+
+
+BSP_DIR = ../../bsp
+include ../../bsp/bsp.mk

sdk/examples/i2c_slave/README.md

@@ -0,0 +1 @@
+i2c_slave例程。

sdk/examples/i2c_slave/main.c

@@ -0,0 +1,61 @@
+#include <stdint.h>
+
+#include "../../bsp/include/uart.h"
+#include "../../bsp/include/i2c.h"
+#include "../../bsp/include/xprintf.h"
+#include "../../bsp/include/utils.h"
+#include "../../bsp/include/rvic.h"
+
+
+#define SLAVE_ADDR   (0xAA)
+
+typedef enum {
+    OP_NONE = 0,
+    OP_READ,
+    OP_WRITE,
+} op_e;
+
+static volatile op_e op;
+
+int main()
+{
+    uart0_init(uart0_putc);
+
+    i2c0_set_mode(I2C_MODE_SLAVE);
+    i2c0_slave_set_address(SLAVE_ADDR);
+    i2c0_slave_set_ready(1);
+    i2c0_set_interrupt_enable(1);
+
+    rvic_set_irq_prio_level(RVIC_INT_ID_4, 1);
+    rvic_irq_enable(RVIC_INT_ID_4);
+    global_irq_enable();
+
+    i2c0_start();
+
+    op = OP_NONE;
+
+    while (1) {
+        if (op == OP_READ) {
+            xprintf("op read addr = 0x%x\n", i2c0_slave_get_op_address());
+            i2c0_slave_set_rsp_data(0x12345678);
+            i2c0_slave_set_ready(1);
+            op = OP_NONE;
+        } else if (op == OP_WRITE) {
+            xprintf("op write addr = 0x%x\n", i2c0_slave_get_op_address());
+            xprintf("op write data = 0x%x\n", i2c0_slave_get_op_data());
+            i2c0_slave_set_ready(1);
+            op = OP_NONE;
+        }
+    }
+}
+
+void i2c0_irq_handler()
+{
+    if (i2c0_slave_op_read())
+        op = OP_READ;
+    else
+        op = OP_WRITE;
+
+    i2c0_clear_irq_pending();
+    rvic_clear_irq_pending(RVIC_INT_ID_4);
+}