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/* metadata:
manufacturer: WCH
*/
#include <stdio.h>
// https://github.com/openwch/ch32v307/pull/90
// https://github.com/openwch/ch32v20x/pull/12
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstrict-prototypes"
#endif
#include "ch32v20x.h"
#include "ch32v20x_it.h"
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif
#include "bsp/board_api.h"
#include "board.h"
/* CH32v203 depending on variants can support 2 USB IPs: FSDEV (port0) and USBFS (port1).
* By default, we use FSDEV, but you can explicitly select by define:
* - CFG_TUD_WCH_USBIP_FSDEV
* - CFG_TUD_WCH_USBIP_USBFS
*/
// Port0: USBD (fsdev). The USBD raises three IRQ lines (LP/HP/WakeUp) that all funnel into the
// non-reentrant tud_int_handler and can nest (HP preempts LP) with QingKe HWSTK enabled. The
// mainline toolchain's plain __attribute__((interrupt)) emits a software prologue that fights the
// hardware context stack and corrupts the return on nesting. Emit naked handlers that rely on
// HWSTK for context save/restore (equivalent to WCH's "WCH-Interrupt-fast"), which nests safely.
#if CFG_TUD_ENABLED && CFG_TUD_WCH_USBIP_FSDEV
// The `call dcd_int_handler` below lives inside naked asm where LTO cannot see it; without a
// compiler-visible reference, -flto builds (make) internalize/drop the symbol and the link fails.
TU_ATTR_USED static void (*const fsdev_isr_keep)(uint8_t) = dcd_int_handler;
#define FSDEV_NAKED_ISR(name) \
__attribute__((naked)) __attribute__((used)) void name(void) { \
__asm volatile("li a0, 0\n\t call dcd_int_handler\n\t mret"); }
#else
#define FSDEV_NAKED_ISR(name) \
__attribute__((naked)) __attribute__((used)) void name(void) { __asm volatile("mret"); }
#endif
FSDEV_NAKED_ISR(USB_LP_CAN1_RX0_IRQHandler)
FSDEV_NAKED_ISR(USB_HP_CAN1_TX_IRQHandler)
FSDEV_NAKED_ISR(USBWakeUp_IRQHandler)
// Port1: USBFS
__attribute__((interrupt)) __attribute__((used)) void USBHD_IRQHandler(void) {
#if CFG_TUD_ENABLED && CFG_TUD_WCH_USBIP_USBFS
tud_int_handler(1);
#endif
#if CFG_TUH_ENABLED
tuh_int_handler(1);
#endif
}
__attribute__((interrupt)) __attribute__((used)) void USBHDWakeUp_IRQHandler(void) {
#if CFG_TUD_WCH_USBIP_USBFS
tud_int_handler(0);
#endif
}
//--------------------------------------------------------------------+
// Board API
//--------------------------------------------------------------------+
#if CFG_TUSB_OS == OPT_OS_NONE
volatile uint32_t system_ticks = 0;
__attribute__((interrupt)) void SysTick_Handler(void) {
SysTick->SR = 0;
system_ticks++;
}
static uint32_t SysTick_Config(uint32_t ticks) {
NVIC_EnableIRQ(SysTicK_IRQn);
SysTick->CTLR = 0;
SysTick->SR = 0;
SysTick->CNT = 0;
SysTick->CMP = ticks - 1;
SysTick->CTLR = 0xF;
return 0;
}
uint32_t tusb_time_millis_api(void) {
return system_ticks;
}
#endif
void board_init(void) {
__disable_irq();
#if CFG_TUSB_OS == OPT_OS_NONE
SysTick_Config(SystemCoreClock / 1000);
#endif
LED_CLOCK_EN();
GPIO_InitTypeDef GPIO_InitStructure = {
.GPIO_Pin = LED_PIN,
.GPIO_Mode = LED_MODE,
.GPIO_Speed = GPIO_Speed_10MHz,
};
GPIO_Init(LED_PORT, &GPIO_InitStructure);
#ifdef UART_DEV
UART_CLOCK_EN();
GPIO_InitTypeDef usart_init = {
.GPIO_Pin = UART_TX_PIN | UART_RX_PIN,
.GPIO_Speed = GPIO_Speed_50MHz,
.GPIO_Mode = GPIO_Mode_AF_PP,
};
GPIO_Init(GPIOA, &usart_init);
USART_InitTypeDef usart = {
.USART_BaudRate = 115200,
.USART_WordLength = USART_WordLength_8b,
.USART_StopBits = USART_StopBits_1,
.USART_Parity = USART_Parity_No,
.USART_Mode = USART_Mode_Tx | USART_Mode_Rx,
.USART_HardwareFlowControl = USART_HardwareFlowControl_None,
};
USART_Init(UART_DEV, &usart);
USART_Cmd(UART_DEV, ENABLE);
#endif
// USB init
uint8_t usb_div;
switch (SystemCoreClock) {
case 48000000: usb_div = RCC_USBCLKSource_PLLCLK_Div1; break;
case 96000000: usb_div = RCC_USBCLKSource_PLLCLK_Div2; break;
case 144000000: usb_div = RCC_USBCLKSource_PLLCLK_Div3; break;
default: TU_ASSERT(0,); break;
}
RCC_USBCLKConfig(usb_div);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, ENABLE); // FSDEV
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_OTG_FS, ENABLE); // USB FS
__enable_irq();
}
void board_reset_to_bootloader(void) {
// board_led_write(true);
//
// __disable_irq();
//
// #if CFG_TUD_ENABLED
// tud_deinit(0);
// RCC_APB1PeriphResetCmd(RCC_APB1Periph_USB, ENABLE);
// RCC_APB1PeriphResetCmd(RCC_APB1Periph_USB, DISABLE);
// #endif
//
// SysTick->CTLR = 0;
// for (int i = WWDG_IRQn; i< DMA1_Channel8_IRQn; i++) {
// NVIC_DisableIRQ(i);
// }
//
// __enable_irq();
//
// // define function pointer to BOOT ROM address
// void (*bootloader_entry)(void) = (void (*)(void))0x1FFF8000;
//
// bootloader_entry();
//
// board_led_write(false);
// while(1) { }
}
void board_led_write(bool state) {
GPIO_WriteBit(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
}
uint32_t board_button_read(void) {
return false;
}
size_t board_get_unique_id(uint8_t id[], size_t max_len) {
(void) max_len;
volatile uint32_t* ch32_uuid = ((volatile uint32_t*) 0x1FFFF7E8UL);
uint32_t* serial_32 = (uint32_t*) (uintptr_t) id;
serial_32[0] = ch32_uuid[0];
serial_32[1] = ch32_uuid[1];
serial_32[2] = ch32_uuid[2];
return 12;
}
int board_uart_read(uint8_t *buf, int len) {
#ifdef UART_DEV
int count;
for (count = 0; count < len; count++) {
if (USART_GetFlagStatus(UART_DEV, USART_FLAG_RXNE) == RESET) {
break;
}
buf[count] = USART_ReceiveData(UART_DEV);
}
return count;
#else
(void) buf; (void) len;
return 0;
#endif
}
int board_uart_write(void const *buf, int len) {
#ifdef UART_DEV
uint8_t const *p = (uint8_t const *) buf;
int count = 0;
while (count < len) {
if (USART_GetFlagStatus(UART_DEV, USART_FLAG_TC) != RESET) {
USART_SendData(UART_DEV, p[count]);
count++;
} else {
break;
}
}
return count;
#else
(void) buf; (void) len;
return -1;
#endif
}
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