/**
* \brief Start capture process.
*
*/
static void ov7740_test_capture_process_run(const struct test_case* const test)
{
if (g_ul_init_error_flag == true) {
/* Return error if previous test about initialization failed */
test_assert_true(test, 0, "OV7740 capture test failed!");
} else {
/* Enable vsync interrupt */
pio_enable_interrupt(OV7740_VSYNC_PIO, OV7740_VSYNC_MASK);
/* Capture acquisition will start on rising edge of Vsync
* signal.
* So wait vsync_flag = 1 before starting the process
*/
while (!g_ul_vsync_flag) {
}
/* Enable vsync interrupt */
pio_disable_interrupt(OV7740_VSYNC_PIO, OV7740_VSYNC_MASK);
/* Reset vsync flag */
g_ul_vsync_flag = false;
/* Configure the PDC Buffer and next Buffer for image capture */
pio_capture_to_buffer(OV7740_VSYNC_PIO, g_auc_capture_buffer,
sizeof(g_auc_capture_buffer));
/* Enable PIO capture */
pio_capture_enable(OV7740_DATA_BUS_PIO);
/* Wait for the end of capture of the g_auc_capture_buffer */
while (!((OV7740_DATA_BUS_PIO->PIO_PCISR & PIO_PCIMR_ENDRX) ==
PIO_PCIMR_ENDRX)) {
}
}
}
/**
* \brief pio_capture Application entry point.
*
* \return Unused (ANSI-C compatibility).
*
*/
int main(void)
{
uint8_t uc_i;
uint32_t ul_length;
uint32_t ul_mode;
uint8_t uc_key;
static uint8_t uc_rx_even_only;
static uint8_t uc_tx_without_en;
/* Initialize the SAM system. */
sysclk_init();
board_init();
/* Configure UART for debug message output. */
configure_console();
/* Configure PIOA clock. */
pmc_enable_periph_clk(ID_PIOA);
pmc_enable_periph_clk(ID_PIOC);
/* Configure PIO Capture handler */
pio_capture_handler_set(capture_handler);
/* Output example information. */
puts(STRING_HEADER);
printf("Frequency: %d MHz.\r\n",
(uint8_t) (sysclk_get_cpu_hz() / 1000000));
printf("Press r to Receive data on PIO Parallel Capture.\r\n");
printf("Press s to Send data on PIO Parallel Capture.\r\n");
uc_key = 0;
while ((uc_key != 'r') && (uc_key != 's')) {
uart_read(CONSOLE_UART, &uc_key);
}
if (uc_key == 'r') {
printf("** RECEIVE mode **\r\n");
/* Initialize PIO capture mode value. */
ul_mode = 0;
/* Set up the parallel capture mode data size as 8 bits. */
ul_mode |= 0 << PIO_PCMR_DSIZE_Pos;
printf("Press y to sample the data when both data enable pins are enabled.\r\n");
printf("Press n to sample the data, don't care the status of the data enable pins.\r\n");
uc_key = 0;
while ((uc_key != 'y') && (uc_key != 'n')) {
uart_read(CONSOLE_UART, &uc_key);
}
if (uc_key == 'y') {
/* Sample the data when both data enable pins are enabled. */
ul_mode &= ~PIO_PCMR_ALWYS;
printf("Receive data when both data enable pins are enabled.\r\n");
} else {
/* Sample the data, don't care the status of the data enable pins. */
ul_mode |= PIO_PCMR_ALWYS;
printf("Receive data, don't care the status of the data enable pins.\r\n");
}
printf("Press y to sample all the data\r\n");
printf("Press n to sample the data only one out of two.\r\n");
uc_key = 0;
while ((uc_key != 'y') && (uc_key != 'n')) {
uart_read(CONSOLE_UART, &uc_key);
}
if (uc_key == 'y') {
/* Sample all the data. */
ul_mode &= ~PIO_PCMR_HALFS;
printf("All data are sampled.\r\n");
} else {
/* Sample the data only one out of two. */
ul_mode |= PIO_PCMR_HALFS;
/* Only if half-Sampling is set, data with an even index are sampled. */
ul_mode &= ~PIO_PCMR_FRSTS;
printf("Only one out of two data is sampled, with an even index.\r\n");
}
/* Initialize PIO Parallel Capture function. */
pio_capture_set_mode(PIOA, ul_mode);
pio_capture_enable(PIOA);
/* Disable all PIOA I/O line interrupt. */
pio_disable_interrupt(PIOA, 0xFFFFFFFF);
/* Configure and enable interrupt of PIO. */
NVIC_DisableIRQ(PIOA_IRQn);
NVIC_ClearPendingIRQ(PIOA_IRQn);
NVIC_SetPriority(PIOA_IRQn, PIO_IRQ_PRI);
NVIC_EnableIRQ(PIOA_IRQn);
while (1) {
g_uc_cbk_received = 0;
/* Clear Receive buffer. */
for (uc_i = 0; uc_i < SIZE_BUFF_RECEPT; uc_i++) {
pio_rx_buffer[uc_i] = 0;
}
/* Set up PDC receive buffer, waiting for 64 bytes. */
packet_t.ul_addr = (uint32_t) pio_rx_buffer;
packet_t.ul_size = SIZE_BUFF_RECEPT;
p_pdc = pio_capture_get_pdc_base(PIOA);
pdc_rx_init(p_pdc, &packet_t, NULL);
/* Enable PDC transfer. */
pdc_enable_transfer(p_pdc, PERIPH_PTCR_RXTEN);
/* Configure the PIO capture interrupt mask. */
pio_capture_enable_interrupt(PIOA,
(PIO_PCIER_ENDRX | PIO_PCIER_RXBUFF));
printf("Waiting...\r\n");
while (g_uc_cbk_received == 0) {
}
}
} else if (uc_key == 's') {
printf("** SEND mode **\r\n");
printf("This is for debug purpose only !\r\n");
printf("Frequency of PIO controller clock must be strictly superior");
printf("to 2 times the frequency of the clock of the device which");
printf(" generates the parallel data.\r\n");
printf("\r\nPlease connect the second board, ");
printf("and put it in receive mode.\r\n");
/* Configure PIO pins which simulate as a sensor. */
pio_configure_pin_group(PIOA, PIO_CAPTURE_CONTROL_PIN_MSK,
PIO_CAPTURE_OUTPUT_PIN_FLAGS);
pio_configure_pin_group(PIOC, PIO_CAPTURE_DATA_PINS_MASK,
PIO_CAPTURE_OUTPUT_PIN_FLAGS);
pio_set_pin_low(PIO_CAPTURE_EN1_IDX);
pio_set_pin_low(PIO_CAPTURE_EN2_IDX);
pio_set_pin_low(PIO_CAPTURE_CCLK_IDX);
/* Enable sync. output data. */
pio_enable_output_write(PIOC, PIO_CAPTURE_DATA_PINS_MASK);
/* Initialize the capture data line. */
pio_sync_output_write(PIOC, 0);
printf("Press y to send data with data enable pins.\r\n");
printf("Press n to send data without data enable pins.\r\n");
uc_key = 0;
while ((uc_key != 'y') && (uc_key != 'n')) {
uart_read(CONSOLE_UART, &uc_key);
}
if (uc_key == 'y') {
uc_tx_without_en = 0;
printf("Send data with both data enable pins enabled.\r\n");
} else {
uc_tx_without_en = 1;
printf("Send data without enabling the data enable pins.\r\n");
}
printf("Press y to indicate that receiver samples all data.\r\n");
printf("Press n to indicate that receiver samples data with an even index.\r\n");
uc_key = 0;
while ((uc_key != 'y') && (uc_key != 'n')) {
uart_read(CONSOLE_UART, &uc_key);
}
if (uc_key == 'y') {
uc_rx_even_only = 0;
printf("Receiver samples all data.\r\n");
} else {
uc_rx_even_only = 1;
printf("Receiver samples data with an even index.\r\n");
}
ul_length = SIZE_BUFF_RECEPT * (1 + uc_rx_even_only);
while (1) {
if (uc_tx_without_en) {
printf("\r\nSend data without enabling the data enable pins.\r\n");
} else {
printf("\r\nSend data with both data enable pins enabled.\r\n");
}
if (!uc_tx_without_en) {
/* Set enable pins. */
pio_set_pin_high(PIO_CAPTURE_EN1_IDX);
pio_set_pin_high(PIO_CAPTURE_EN2_IDX);
}
for (uc_i = 0; uc_i < ul_length;) {
/* Send data. */
pio_sync_output_write(PIOC,
(uc_i << PIO_CAPTURE_DATA_POS));
/* Set clock. */
pio_set_pin_high(PIO_CAPTURE_CCLK_IDX);
delay_us(20);
/* Clear clock. */
pio_set_pin_low(PIO_CAPTURE_CCLK_IDX);
delay_us(20);
uc_i++;
}
if (!uc_tx_without_en) {
/* Clear enable pins. */
pio_set_pin_low(PIO_CAPTURE_EN1_IDX);
pio_set_pin_low(PIO_CAPTURE_EN2_IDX);
}
printf("Press a key.\r\n");
while (uart_read(CONSOLE_UART, &uc_key)) {
}
}
}
return 0;
}
