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Adds support for Adafruit Trinket M0

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This commit is contained in:
Jean Gressmann
2021-10-30 14:39:03 +02:00
parent 2019c8ad7e
commit ba34f420db
4 changed files with 268 additions and 0 deletions
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83
hw/bsp/samd21/family.c
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@@ -44,6 +44,11 @@ void USB_Handler(void)
tud_int_handler(0);
}
//--------------------------------------------------------------------+
// UART support
//--------------------------------------------------------------------+
void uart_init(void);
//--------------------------------------------------------------------+
// MACRO TYPEDEF CONSTANT ENUM DECLARATION
//--------------------------------------------------------------------+
@@ -84,6 +89,8 @@ void board_init(void)
gpio_set_pin_pull_mode(BUTTON_PIN, BUTTON_STATE_ACTIVE ? GPIO_PULL_DOWN : GPIO_PULL_UP);
#endif
uart_init();
#if CFG_TUSB_OS == OPT_OS_FREERTOS
// If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
NVIC_SetPriority(USB_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
@@ -138,6 +145,81 @@ uint32_t board_button_read(void)
#endif
}
#if defined(UART_SERCOM)
#define BOARD_SERCOM2(n) SERCOM ## n
#define BOARD_SERCOM(n) BOARD_SERCOM2(n)
void uart_init(void)
{
#if UART_SERCOM == 0
gpio_set_pin_function(PIN_PA06, PINMUX_PA06D_SERCOM0_PAD2);
gpio_set_pin_function(PIN_PA07, PINMUX_PA07D_SERCOM0_PAD3);
// setup clock (48MHz)
_pm_enable_bus_clock(PM_BUS_APBC, SERCOM0);
_gclk_enable_channel(SERCOM0_GCLK_ID_CORE, GCLK_CLKCTRL_GEN_GCLK0_Val);
SERCOM0->USART.CTRLA.bit.SWRST = 1; /* reset SERCOM & enable config */
while(SERCOM0->USART.SYNCBUSY.bit.SWRST);
SERCOM0->USART.CTRLA.reg = /* CMODE = 0 -> async, SAMPA = 0, FORM = 0 -> USART frame, SMPR = 0 -> arithmetic baud rate */
SERCOM_USART_CTRLA_SAMPR(1) | /* 0 = 16x / arithmetic baud rate, 1 = 16x / fractional baud rate */
// SERCOM_USART_CTRLA_FORM(0) | /* 0 = USART Frame, 2 = LIN Master */
SERCOM_USART_CTRLA_DORD | /* LSB first */
SERCOM_USART_CTRLA_MODE(1) | /* 0 = Asynchronous, 1 = USART with internal clock */
SERCOM_USART_CTRLA_RXPO(3) | /* pad 3 */
SERCOM_USART_CTRLA_TXPO(1); /* pad 2 */
SERCOM0->USART.CTRLB.reg =
SERCOM_USART_CTRLB_TXEN | /* tx enabled */
SERCOM_USART_CTRLB_RXEN; /* rx enabled */
SERCOM0->USART.BAUD.reg = SERCOM_USART_BAUD_FRAC_FP(0) | SERCOM_USART_BAUD_FRAC_BAUD(26);
SERCOM0->USART.CTRLA.bit.ENABLE = 1; /* activate SERCOM */
while(SERCOM0->USART.SYNCBUSY.bit.ENABLE); /* wait for SERCOM to be ready */
#endif
}
static inline void uart_send_buffer(uint8_t const *text, size_t len)
{
for (size_t i = 0; i < len; ++i) {
BOARD_SERCOM(UART_SERCOM)->USART.DATA.reg = text[i];
while((BOARD_SERCOM(UART_SERCOM)->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_TXC) == 0);
}
}
static inline void uart_send_str(const char* text)
{
while (*text) {
BOARD_SERCOM(UART_SERCOM)->USART.DATA.reg = *text++;
while((BOARD_SERCOM(UART_SERCOM)->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_TXC) == 0);
}
}
int board_uart_read(uint8_t* buf, int len)
{
(void) buf; (void) len;
return 0;
}
int board_uart_write(void const * buf, int len)
{
if (len < 0) {
uart_send_str(buf);
} else {
uart_send_buffer(buf, len);
}
return len;
}
#else // ! defined(UART_SERCOM)
void uart_init(void)
{
}
int board_uart_read(uint8_t* buf, int len)
{
(void) buf; (void) len;
@@ -149,6 +231,7 @@ int board_uart_write(void const * buf, int len)
(void) buf; (void) len;
return 0;
}
#endif
#if CFG_TUSB_OS == OPT_OS_NONE
volatile uint32_t system_ticks = 0;