--- /dev/null
+ADC and electret/mems microphone example
+
+Copyright 2015 Nathael Pajani <nathael.pajani@ed3l.fr>
+
+
+/* ****************************************************************************
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *************************************************************************** */
+
+This example shows the support of the internal ADC in continuous sampling (burst)
+mode, with high data rate transmission over serial line (1.152Mbits/s)
+
+The conversion results are sent over the UART0 serial line (1152000 8n1) creating
+simple raw, 8bit, 1channel audio files.
+Play them using aplay and the following parameters :
+$ aplay -t raw -f U8 -r 22000 aud.raw
+
+The quality is much better using mems microphone. Used ADMP401 for the test, on
+a Sparkfun breakout board.
+
--- /dev/null
+/****************************************************************************
+ * apps/microphone/main.c
+ *
+ * ADC example with very high sample rate and auto Tx on serial at high speed.
+ *
+ * Copyright 2013-2014 Nathael Pajani <nathael.pajani@ed3l.fr>
+ *
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *************************************************************************** */
+
+
+#include <stdint.h>
+#include "core/lpc_regs_12xx.h"
+#include "core/lpc_core_cm0.h"
+#include "core/pio.h"
+#include "core/system.h"
+#include "core/systick.h"
+#include "lib/stdio.h"
+#include "drivers/serial.h"
+#include "drivers/gpio.h"
+#include "extdrv/status_led.h"
+#include "drivers/adc.h"
+
+
+#define MODULE_VERSION 0x04
+#define MODULE_NAME "GPIO Demo Module"
+
+
+#define SELECTED_FREQ FREQ_SEL_48MHz
+
+/***************************************************************************** */
+/* Pins configuration */
+/* pins blocks are passed to set_pins() for pins configuration.
+ * Unused pin blocks can be removed safely with the corresponding set_pins() call
+ * All pins blocks may be safelly merged in a single block for single set_pins() call..
+ */
+const struct pio_config common_pins[] = {
+ /* UART 0 */
+ { LPC_UART0_RX_PIO_0_1, LPC_IO_DIGITAL },
+ { LPC_UART0_TX_PIO_0_2, LPC_IO_DIGITAL },
+ ARRAY_LAST_PIO,
+};
+
+const struct pio_config adc_pins[] = {
+ { LPC_ADC_AD0_PIO_0_30, LPC_IO_ANALOG },
+ { LPC_ADC_AD1_PIO_0_31, LPC_IO_ANALOG },
+ { LPC_ADC_AD2_PIO_1_0, LPC_IO_ANALOG },
+ { LPC_ADC_AD3_PIO_1_1, LPC_IO_ANALOG },
+ { LPC_ADC_AD4_PIO_1_2, LPC_IO_ANALOG },
+ { LPC_ADC_AD5_PIO_1_3, LPC_IO_ANALOG },
+ ARRAY_LAST_PIO,
+};
+
+const struct pio status_led_green = LPC_GPIO_1_4;
+const struct pio status_led_red = LPC_GPIO_1_5;
+
+
+
+/***************************************************************************** */
+void system_init()
+{
+ /* Stop the watchdog */
+ stop_watchdog(); /* Do it right now, before it gets a chance to break in */
+
+ /* Note: Brown-Out detection must be powered to operate the ADC. adc_on() will power
+ * it back on if called after system_init() */
+ system_brown_out_detection_config(0);
+ system_set_default_power_state();
+ clock_config(SELECTED_FREQ);
+ set_pins(common_pins);
+ set_pins(adc_pins);
+ gpio_on();
+ status_led_config(&status_led_green, &status_led_red);
+ /* System tick timer MUST be configured and running in order to use the sleeping
+ * functions */
+ systick_timer_on(1); /* 1ms */
+ systick_start();
+}
+
+/* Define our fault handler. This one is not mandatory, the dummy fault handler
+ * will be used when it's not overridden here.
+ * Note : The default one does a simple infinite loop. If the watchdog is deactivated
+ * the system will hang.
+ */
+void fault_info(const char* name, uint32_t len)
+{
+ serial_write(0, name, len);
+ /* Wait for end of Tx */
+ serial_flush(0);
+ /* FIXME : Perform soft reset of the micro-controller ! */
+ while (1);
+}
+
+
+
+/***************************************************************************** */
+int main(void) {
+ system_init();
+ uart_on(0, 1152000, NULL);
+ adc_on();
+
+ adc_start_burst_conversion(LPC_ADC_CHANNEL(0));
+ while (1) {
+ /* ADC Test */
+ uint16_t val = 0;
+ uint8_t tmp = 0;
+ adc_get_value(&val, LPC_ADC_NUM(0));
+ tmp = (val >> 2);
+ serial_write(0, (char*)&tmp, 1);
+ usleep(20);
+ }
+ return 0;
+}
+
+
+
