[feat] add uart_interrupt demo

driver/start.S

@@ -19,10 +19,6 @@ isr_reset:
     ldr r0, =0xE000E280
     ldr r1, =0xFFFFFFFF
     str r1, [r0]
-    /* relocate VTOR, vector table offset register */
-    ldr r0, =0xE000ED08
-    ldr r1, =_vector_load
-    str r1, [r0]
     /* set MSP, main stack point */
     ldr r0, =_stack_top
     msr msp, r0
@@ -52,7 +48,7 @@ isr_reset:
     cmp r1, r2
     blo 1b
 2:
-;    bl  SystemInit
+    bl  irq_init
     bl  main
     b  .
 .size  isr_reset, .-isr_reset

example/peripherals/uart/uart_interrupt/CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.10)
+
+include(proj.conf)
+
+project(${EXAMPLE_NAME} VERSION 0.1)
+add_executable(${EXAMPLE_NAME}.elf main.c)
+
+add_subdirectory(${SDK_BASE_DIR} sdk)
+target_link_libraries(${EXAMPLE_NAME}.elf sdk)

example/peripherals/uart/uart_interrupt/Makefile

@@ -0,0 +1,18 @@
+EXAMPLE_BASE_DIR ?= $(shell realpath .)
+EXAMPLE_NAME := $(notdir $(patsubst %/,%,$(CURDIR)))
+SDK_BASE_DIR ?= $(shell realpath ./../../../..)
+
+export SDK_BASE_DIR
+export EXAMPLE_NAME
+export EXAMPLE_BASE_DIR
+
+GCC_PATH := $(shell which arm-none-eabi-gcc)
+CROSS_COMPILE := $(patsubst %gcc,%,$(GCC_PATH))
+ifeq ($(GCC_PATH),)
+$(error arm-none-eabi-gcc not found in PATH. Please install the ARM toolchain.)
+endif
+
+# add custom cmake definition
+#cmake_definition+=-Dxxx=sss
+
+include $(SDK_BASE_DIR)/project.build

example/peripherals/uart/uart_interrupt/main.c

@@ -0,0 +1,43 @@
+#include "gpio.h"
+#include "uart.h"
+#include "resets.h"
+#include "irq.h"
+#include "stdio.h"
+
+#define UART_ID uart0_hw
+
+void uart_isr(void)
+{
+    int c, r;
+
+    while (1) {
+        c = uart_get_char(UART_ID);
+        if (c < 0) {
+            break;
+        } else {
+            while (1) {
+                r = uart_put_char(UART_ID, (uint8_t)c);
+                if (r < 0) {
+                    continue;
+                } else {
+                    break;
+                }
+            }
+        }
+    }
+}
+
+int main(void)
+{
+    reset_unreset_blocks_wait(RESETS_BLOCK_IO_BANK0 | RESETS_BLOCK_UART0);
+
+    gpio_init(0, GPIO_FUNC_UART | GPIO_PULL_UP | GPIO_DRIVE_4MA); /* UART_TX pin */
+    gpio_init(1, GPIO_FUNC_UART | GPIO_PULL_UP | GPIO_SCHMITT | GPIO_PAD_IE | GPIO_PAD_OD); /* UART_RX pin */
+    uart_init(UART_ID, 6 * 1000 * 1000, UART_DATABITS_8 | UART_PARITY_NONE | UART_STOPBITS_1);
+    printf("uart_interrupt example\r\n");
+    uart_int_enable(UART_ID, UART_INT_RX | UART_INT_RTO);
+    irq_attach(UART0_IRQ, uart_isr);
+    irq_enable(UART0_IRQ);
+
+    return 0;
+}

example/peripherals/uart/uart_interrupt/proj.conf

@@ -0,0 +1 @@
+# set(CONFIG_COMPONENT1 1)