void gpio_init(void)
{
SIM->SCGC5 |= SIM_SCGC5_PORTA_MASK | SIM_SCGC5_PORTB_MASK | SIM_SCGC5_PORTC_MASK | SIM_SCGC5_PORTD_MASK | SIM_SCGC5_PORTE_MASK;
// configure pin as GPIO
PIN_HID_LED_PORT->PCR[PIN_HID_LED_BIT] = PORT_PCR_MUX(1);
PIN_MSC_LED_PORT->PCR[PIN_MSC_LED_BIT] = PORT_PCR_MUX(1);
PIN_CDC_LED_PORT->PCR[PIN_CDC_LED_BIT] = PORT_PCR_MUX(1);
PIN_SW_RESET_PORT->PCR[PIN_SW_RESET_BIT] = PORT_PCR_MUX(1);
PIN_POWER_EN_PORT->PCR[PIN_POWER_EN_BIT] = PORT_PCR_MUX(1);
// led off
gpio_set_hid_led(GPIO_LED_OFF);
gpio_set_cdc_led(GPIO_LED_OFF);
gpio_set_msc_led(GPIO_LED_OFF);
// power regulator on
PIN_POWER_EN_GPIO->PDOR |= PIN_POWER_EN;
// set as output
PIN_HID_LED_GPIO->PDDR |= PIN_HID_LED;
PIN_MSC_LED_GPIO->PDDR |= PIN_MSC_LED;
PIN_CDC_LED_GPIO->PDDR |= PIN_CDC_LED;
PIN_POWER_EN_GPIO->PDDR |= PIN_POWER_EN;
// set as input
PIN_SW_RESET_GPIO->PDDR &= ~PIN_SW_RESET;
}
void gpio_init(void)
{
SIM->SCGC5 |= SIM_SCGC5_PORTA_MASK | SIM_SCGC5_PORTB_MASK | SIM_SCGC5_PORTC_MASK | SIM_SCGC5_PORTD_MASK | SIM_SCGC5_PORTE_MASK;
// configure pin as GPIO
PIN_HID_LED_PORT->PCR[PIN_HID_LED_BIT] = PORT_PCR_MUX(1);
PIN_MSC_LED_PORT->PCR[PIN_MSC_LED_BIT] = PORT_PCR_MUX(1);
PIN_CDC_LED_PORT->PCR[PIN_CDC_LED_BIT] = PORT_PCR_MUX(1);
PIN_SW_RESET_PORT->PCR[PIN_SW_RESET_BIT] = PORT_PCR_MUX(1);
PIN_POWER_EN_PORT->PCR[PIN_POWER_EN_BIT] = PORT_PCR_MUX(1);
// led off
gpio_set_hid_led(GPIO_LED_OFF);
gpio_set_cdc_led(GPIO_LED_OFF);
gpio_set_msc_led(GPIO_LED_OFF);
// power regulator on
PIN_POWER_EN_GPIO->PDOR |= PIN_POWER_EN;
// set as output
PIN_HID_LED_GPIO->PDDR |= PIN_HID_LED;
PIN_MSC_LED_GPIO->PDDR |= PIN_MSC_LED;
PIN_CDC_LED_GPIO->PDDR |= PIN_CDC_LED;
PIN_POWER_EN_GPIO->PDDR |= PIN_POWER_EN;
// set as input
PIN_SW_RESET_GPIO->PDDR &= ~PIN_SW_RESET;
// Let the voltage rails stabilize. This is especailly important
// during software resets, since the target's 3.3v rail can take
// 20-50ms to drain. During this time the target could be driving
// the reset pin low, causing the bootloader to think the reset
// button is pressed.
// Note: With optimization set to -O2 the value 1000000 delays for ~85ms
busy_wait(1000000);
}
__task void main_task(void)
{
// State processing
uint16_t flags = 0;
// LED
gpio_led_state_t hid_led_value = GPIO_LED_ON;
gpio_led_state_t cdc_led_value = GPIO_LED_ON;
gpio_led_state_t msc_led_value = GPIO_LED_ON;
// USB
uint32_t usb_state_count = USB_BUSY_TIME;
// thread running after usb connected started
uint8_t thread_started = 0;
// button state
main_reset_state_t main_reset_button_state = MAIN_RESET_RELEASED;
// Initialize settings
config_init();
// Initialize our serial mailbox
os_mbx_init(&serial_mailbox, sizeof(serial_mailbox));
// Get a reference to this task
main_task_id = os_tsk_self();
// leds
gpio_init();
// Turn off LED
gpio_set_hid_led(GPIO_LED_ON);
gpio_set_cdc_led(GPIO_LED_ON);
gpio_set_msc_led(GPIO_LED_ON);
// do some init with the target before USB and files are configured
prerun_target_config();
// Update versions and IDs
info_init();
// USB
usbd_init();
vfs_user_enable(true);
usbd_connect(0);
usb_state = USB_CONNECTING;
usb_state_count = USB_CONNECT_DELAY;
// Start timer tasks
os_tsk_create_user(timer_task_30mS, TIMER_TASK_30_PRIORITY, (void *)stk_timer_30_task, TIMER_TASK_30_STACK);
// Target running
target_set_state(RESET_RUN);
while(1) {
os_evt_wait_or( FLAGS_MAIN_RESET // Put target in reset state
| FLAGS_MAIN_90MS // 90mS tick
| FLAGS_MAIN_30MS // 30mS tick
| FLAGS_MAIN_POWERDOWN // Power down interface
| FLAGS_MAIN_DISABLEDEBUG // Disable target debug
| FLAGS_MAIN_PROC_USB // process usb events
,NO_TIMEOUT);
// Find out what event happened
flags = os_evt_get();
if (flags & FLAGS_MAIN_PROC_USB) {
USBD_Handler();
}
if (flags & FLAGS_MAIN_RESET) {
target_set_state(RESET_RUN);
}
if (flags & FLAGS_MAIN_POWERDOWN) {
// Disable debug
target_set_state(NO_DEBUG);
// Disconnect USB
usbd_connect(0);
// Turn off LED
gpio_set_hid_led(GPIO_LED_OFF);
gpio_set_cdc_led(GPIO_LED_OFF);
gpio_set_msc_led(GPIO_LED_OFF);
// TODO: put the interface chip in sleep mode
while(1);
}
if (flags & FLAGS_MAIN_DISABLEDEBUG) {
// Disable debug
target_set_state(NO_DEBUG);
}
if (flags & FLAGS_MAIN_90MS) {
// Update USB busy status
vfs_user_periodic(90); // FLAGS_MAIN_90MS
// Update USB connect status
switch (usb_state) {
case USB_DISCONNECTING:
usb_state = USB_DISCONNECTED;
usbd_connect(0);
break;
case USB_CONNECTING:
// Wait before connecting
if (DECZERO(usb_state_count) == 0) {
usbd_connect(1);
usb_state = USB_CHECK_CONNECTED;
}
break;
case USB_CHECK_CONNECTED:
if(usbd_configured()) {
if (!thread_started) {
os_tsk_create_user(hid_process, DAP_TASK_PRIORITY, (void *)stk_dap_task, DAP_TASK_STACK);
serial_task_id = os_tsk_create_user(serial_process, SERIAL_TASK_PRIORITY, (void *)stk_serial_task, SERIAL_TASK_STACK);
thread_started = 1;
}
usb_state = USB_CONNECTED;
}
break;
case USB_CONNECTED:
case USB_DISCONNECTED:
default:
break;
}
}
// 30mS tick used for flashing LED when USB is busy
if (flags & FLAGS_MAIN_30MS) {
// handle reset button without eventing
switch (main_reset_button_state) {
default:
case MAIN_RESET_RELEASED:
if (0 == gpio_get_sw_reset()) {
main_reset_button_state = MAIN_RESET_PRESSED;
target_forward_reset(true);
}
break;
case MAIN_RESET_PRESSED:
// ToDo: add a counter to do a mass erase or target recovery after xxx seconds of being held
if (1 == gpio_get_sw_reset()) {
main_reset_button_state = MAIN_RESET_TARGET;
}
break;
case MAIN_RESET_TARGET:
target_forward_reset(false);
main_reset_button_state = MAIN_RESET_RELEASED;
break;
}
if (hid_led_usb_activity && ((hid_led_state == MAIN_LED_FLASH) || (hid_led_state == MAIN_LED_FLASH_PERMANENT))) {
// Flash DAP LED ONCE
if (hid_led_value) {
hid_led_value = GPIO_LED_OFF;
} else {
hid_led_value = GPIO_LED_ON; // Turn on
if (hid_led_state == MAIN_LED_FLASH) {
hid_led_usb_activity = 0;
}
}
// Update hardware
gpio_set_hid_led(hid_led_value);
}
if (msc_led_usb_activity && ((msc_led_state == MAIN_LED_FLASH) || (msc_led_state == MAIN_LED_FLASH_PERMANENT))) {
// Flash MSD LED ONCE
if (msc_led_value) {
msc_led_value = GPIO_LED_OFF;
} else {
msc_led_value = GPIO_LED_ON; // Turn on
if (msc_led_state == MAIN_LED_FLASH) {
msc_led_usb_activity = 0;
}
}
// Update hardware
gpio_set_msc_led(msc_led_value);
}
if (cdc_led_usb_activity && ((cdc_led_state == MAIN_LED_FLASH) || (cdc_led_state == MAIN_LED_FLASH_PERMANENT))) {
// Flash CDC LED ONCE
if (cdc_led_value) {
cdc_led_value = GPIO_LED_OFF;
} else {
cdc_led_value = GPIO_LED_ON; // Turn on
if (cdc_led_state == MAIN_LED_FLASH) {
cdc_led_usb_activity = 0;
}
}
// Update hardware
gpio_set_cdc_led(cdc_led_value);
}
}
}
}