diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/init.c | 12 | ||||
| -rw-r--r-- | src/isr.s | 5 | ||||
| -rw-r--r-- | src/main.c (renamed from src/blinky.c) | 59 |
3 files changed, 52 insertions, 24 deletions
@@ -5,7 +5,7 @@ void on_reset(void); -void __attribute__((weak, interrupt, __section__(".isr_vector"))) +void __attribute__((weak, interrupt, __section__(".isr_vector.routines"))) default_irq_handler(void) { return; @@ -13,7 +13,7 @@ default_irq_handler(void) #define WEAK_IRQ(irq) \ void __attribute__(( \ - weak, alias("default_irq_handler"), __section__(".isr_vector"))) \ + weak, alias("default_irq_handler"), __section__(".isr_vector.routines"))) \ irq(void) WEAK_IRQ(irq_on_reset); @@ -60,7 +60,9 @@ extern uint32_t BSS_STOP; static inline void set_mtvec(void* vector_table) { - asm volatile("csrw mtvec, %0" : : "r"(vector_table)); + uint32_t mtvec = (uint32_t) vector_table; + mtvec |= 1; // Set interrupt table mode to "VECTORED" + asm volatile("csrw mtvec, %0" : : "r"(mtvec)); } /* @@ -99,7 +101,7 @@ extern void main(void); /* Start function. Responsible for initializing the system and jumping to the * main function. */ -static void start(void) +static __attribute((__section__(".sinit.1"))) void start(void) { /* Initialize the data segments. */ init_data_segments(); @@ -113,7 +115,7 @@ static void start(void) * The reset callback.This has to be a naked function because the stack pointer * may not be initialized!!. */ -__attribute((naked, __section__(".isr_routines.on_reset"))) void on_reset(void) +__attribute((naked, __section__(".sinit"))) void _begin(void) { // Set up the stack pointer to point to the end of SRAM. asm volatile( @@ -1,8 +1,3 @@ - -.section .sinit -_start: -j on_reset /* first instruction. Should jump directly to on_reset */ - .section .isr_vector .global isr_vector isr_vector: diff --git a/src/blinky.c b/src/main.c index 355b479..3066123 100644 --- a/src/blinky.c +++ b/src/main.c @@ -1,11 +1,20 @@ #include <stdint.h> -#include "isr_vector.h" #include "ch573/gpio.h" +#include "ch573/uart.h" +#include "ch573/pwr.h" + +#include "isr_vector.h" #define GPIO_PORT_A ch573_gpio__gpio_port_a #define GPIO_PORT CH573_GPIO__GPIO_PORT_T_INTF +#define UART1 ch573_uart__uart1 +#define UART CH573_UART__UART_T_INTF + +#define PWR1 ch573_pwr__pwr_mgmt +#define PWR CH573_PWR__PWR_MGMT_T_INTF + /* * Function which delays for a bit. */ @@ -57,29 +66,51 @@ extern uint32_t DATA_VALUES_IN_FLASH; extern uint32_t DATA_SEGMENT_START; extern uint32_t DATA_SEGMENT_STOP; +#define gpio_usart1_tx_pin 9 +#define gpio_usart1_rx_pin 8 + +const char* hello_world = "Hello, World!\r\n"; + +#define BAUD_RATE 115200 + /* Main routine. This is called on_reset once everything else has been set up. */ void main(void) { - GPIO_PORT.dir.set(GPIO_PORT_A, DIR_OUT, 8); - GPIO_PORT.pd_drv.set(GPIO_PORT_A, PD_DRV_OPEN_DRAIN, 8); + GPIO_PORT.dir.set(GPIO_PORT_A, DIR_OUT, gpio_usart1_tx_pin); + GPIO_PORT.pd_drv.set(GPIO_PORT_A, 0, gpio_usart1_tx_pin); + + UART.div.set(UART1, 1); + UART.fcr.set(UART1, 0x07); + UART.ier.txd_en.set(UART1, ON); + UART.lcr.word_sz.set(UART1, WORD_SZ_8_BITS); + + uint32_t dl = (10 * 6400000 / 8 / BAUD_RATE + 5) / 10; + UART.dl.set(UART1, dl); + + // PWR.slp_clk_off_0.uart1.set(PWR1, CLK_SOURCE_ENABLED); + + const char* ptr = hello_world; - for (;;) { - if (deadbeef == 0xdeadbeef) { - GPIO_PORT.out.set(GPIO_PORT_A, ON, 8); + while (1) { + if (*ptr == 0) { + ptr = hello_world; } - delay(); - delay(); - delay(); - GPIO_PORT.out.set(GPIO_PORT_A, OFF, 8); - delay(); + + while (!UART.lsr.thr_empty.get(UART1)); + UART.thr.set(UART1, *(ptr++)); } } -IRQ(systick) { +IRQ(systick) +{ collatz(5); } -IRQ(exc) {} +IRQ(exc) +{ +} -IRQ(nmi) {} +IRQ(nmi) +{ +} |