example: add spi_master

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

tests/example/common.mk

@@ -19,6 +19,8 @@ C_SRCS += $(COMMON_DIR)/init.c
 C_SRCS += $(COMMON_DIR)/lib/utils.c
 C_SRCS += $(COMMON_DIR)/lib/xprintf.c
 C_SRCS += $(COMMON_DIR)/lib/uart.c
+C_SRCS += $(COMMON_DIR)/lib/flash_n25q.c
+C_SRCS += $(COMMON_DIR)/lib/spi.c
 
 LINKER_SCRIPT := $(COMMON_DIR)/link.lds
 

tests/example/spi_master/Makefile

@@ -0,0 +1,21 @@
+RISCV_ARCH := rv32im
+RISCV_ABI := ilp32
+RISCV_MCMODEL := medlow
+
+
+TARGET = spi_master
+
+
+#CFLAGS += -DSIMULATION
+#CFLAGS += -Os
+#ASM_SRCS +=
+#LDFLAGS +=
+#INCLUDES += -I.
+
+C_SRCS := \
+	main.c \
+
+
+COMMON_DIR = ..
+TOOLCHAIN_DIR = ../../..
+include ../common.mk

tests/example/spi_master/README.md

@@ -0,0 +1 @@
+SPI norflash例程。

tests/example/spi_master/main.c

@@ -0,0 +1,47 @@
+#include <stdint.h>
+
+#include "../include/uart.h"
+#include "../include/flash_n25q.h"
+#include "../include/xprintf.h"
+
+
+uint8_t id_data[3];
+uint8_t program_data[N25Q_PAGE_SIZE];
+uint8_t read_data[N25Q_PAGE_SIZE];
+
+
+int main()
+{
+    // 初始化串口
+    uart_init();
+
+    // 初始化N25Q flash
+    n25q_init();
+
+    // 读N25Q ID号
+    n25q_read_id(id_data, 3);
+    xprintf("manu id = 0x%x\n", id_data[0]);
+    xprintf("device id = 0x%x, 0x%x\n", id_data[1], id_data[2]);
+
+    uint16_t i;
+    // 初始化要编程的数据
+    for (i = 0; i < N25Q_PAGE_SIZE; i++)
+        program_data[i] = 0x55;
+
+    xprintf("start erase subsector...\n");
+    // 擦除第0个子扇区
+    n25q_subsector_erase(0x00);
+    xprintf("start program page...\n");
+    // 编程第1页
+    n25q_page_program(program_data, N25Q_PAGE_SIZE, 0x01);
+    xprintf("start read page...\n");
+    // 读第1页
+    n25q_read_data(read_data, N25Q_PAGE_SIZE, N25Q_PAGE_TO_ADDR(1));
+
+    xprintf("read data: \n");
+    // 打印读出来的数据
+    for (i = 0; i < N25Q_PAGE_SIZE; i++)
+        xprintf("0x%x\n", read_data[i]);
+
+    while (1);
+}