- I²C
- I²C EEPROM
- TMP101 temperature sensor
+ - ADC
- GPIO
TODO :
- Deep sleep mode support.
-- ADC support
- Test all the GPIO in different modes
- Add support for SPI
- Add support for SDCard over SPI
void uart_clk_update(void) __attribute__ ((weak, alias ("Dummy_Clk_Updater")));
void i2c_clock_update(void) __attribute__ ((weak, alias ("Dummy_Clk_Updater")));
void spi_clk_update(void) __attribute__ ((weak, alias ("Dummy_Clk_Updater")));
+void adc_clk_update(void) __attribute__ ((weak, alias ("Dummy_Clk_Updater")));
static void propagate_main_clock(void)
{
uart_clk_update();
i2c_clock_update();
spi_clk_update();
+ adc_clk_update();
}
/* IO config clock */
void set_spi_pins(void) __attribute__ ((weak, alias ("Dummy_Pin_Config")));
void set_uarts_pins(void) __attribute__ ((weak, alias ("Dummy_Pin_Config")));
void set_gpio_pins(void) __attribute__ ((weak, alias ("Dummy_Pin_Config")));
+void set_adc_pins(void) __attribute__ ((weak, alias ("Dummy_Pin_Config")));
void system_set_default_pins(void)
{
set_i2c_pins();
set_spi_pins();
set_gpio_pins();
+ set_adc_pins();
}
--- /dev/null
+/****************************************************************************
+ * drivers/adc.c
+ *
+ * Copyright 2012 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/>.
+ *
+ *************************************************************************** */
+
+
+
+/***************************************************************************** */
+/* Analog to Digital Converter (ADC) */
+/***************************************************************************** */
+
+#include <stdint.h>
+#include "core/lpc_regs_12xx.h"
+#include "core/lpc_core_cm0.h"
+#include "core/system.h"
+
+/* Should be as near to 9MHz as possible */
+#define adc_clk_Val 9000000
+
+
+
+/***************************************************************************** */
+/* Generic ADC handler */
+void ADC_Handler(void)
+{
+/*
+ volatile struct lpc_adc* adc = LPC_ADC;
+ uint32_t status = adc->status;
+*/
+ /* .... What to do ... is specific to your application */
+}
+
+/* Start a conversion on the given channel (0 to 7) */
+void adc_start_convertion_once(unsigned int channel, int use_int)
+{
+ struct lpc_adc* adc = LPC_ADC;
+
+ if (channel > 7)
+ return;
+
+ /* Set conversion channel bit */
+ adc->ctrl = ((adc->ctrl & ~LPC_ADC_CHANNEL_MASK) | (0x01 << channel));
+ if (use_int) {
+ /* Set interrupt Bit */
+ adc->int_en = (0x01 << channel);
+ } else {
+ adc->int_en = 0;
+ }
+ /* Clear burst conversion if running ? */
+ adc->ctrl &= ~LPC_ADC_BURST;
+ /* Start conversion */
+ adc->ctrl = ((adc->ctrl & ~LPC_ADC_START_CONV_MASK) | LPC_ADC_START_CONV_NOW);
+}
+
+
+/* Read the conversion from the given channel (0 to 7)
+ * This function reads the conversion value directly in the data register and
+ * always returns a value.
+ * Return 1 if the value is a new one, else return 0.
+ * Return -1 if channel does not exist
+ */
+int adc_get_value(uint16_t * val, int channel)
+{
+ struct lpc_adc* adc = LPC_ADC;
+ uint32_t save_reg = 0;
+
+ if (channel > 7)
+ return -1;
+
+ /* Save the whole register as some bits are cleared when register is read */
+ save_reg = adc->data[channel];
+ *val = ((save_reg >> LPC_ADC_RESULT_SHIFT) & LPC_ADC_RESULT_MASK);
+ /* Has this conversion value been already read ? */
+ if (! (save_reg & LPC_ADC_CONV_DONE)) {
+ return 0;
+ }
+ return 1;
+}
+
+/* Start burst conversions.
+ * channels is a bit mask of requested channels.
+ * Use LPC_ADC_CHANNEL_0 .. 7
+ */
+void adc_start_burst_conversion(uint8_t channels)
+{
+ struct lpc_adc* adc = LPC_ADC;
+
+ /* Set conversion channel bits */
+ adc->ctrl = ((adc->ctrl & ~LPC_ADC_CHANNEL_MASK) | channels);
+ adc->ctrl |= LPC_ADC_BURST;
+}
+
+/* Unsupported Yet */
+/* This should be used to configure conversion start on falling or rising edges of
+ * some signals, or on timer for burst conversions.
+ */
+void adc_prepare_conversion_on_event(void)
+{
+ /* Unsupported Yet */
+}
+
+/* On LPC1224 there is no possibility to change the ADC resolution */
+void adc_set_resolution(int bits)
+{
+}
+
+
+
+/***************************************************************************** */
+/* ADC Setup : private part : Clocks, Pins, Power and Mode */
+void set_adc_pins(void)
+{
+ struct lpc_io_control* ioctrl = LPC_IO_CONTROL;
+
+ /* Make sure IO_Config is clocked */
+ io_config_clk_on();
+ /* Configure ADC pins */
+ ioctrl->pio0_30 = LPC_IO_FUNC_ALT(3) | LPC_IO_ANALOG;
+ ioctrl->pio0_31 = LPC_IO_FUNC_ALT(3) | LPC_IO_ANALOG;
+ ioctrl->pio1_0 = LPC_IO_FUNC_ALT(2) | LPC_IO_ANALOG;
+ ioctrl->pio1_1 = LPC_IO_FUNC_ALT(2) | LPC_IO_ANALOG;
+ ioctrl->pio1_2 = LPC_IO_FUNC_ALT(2) | LPC_IO_ANALOG;
+ ioctrl->pio1_3 = LPC_IO_FUNC_ALT(1) | LPC_IO_ANALOG;
+ /* Config done, power off IO_CONFIG block */
+ io_config_clk_off();
+}
+
+void adc_clk_update(void)
+{
+ struct lpc_adc* adc = LPC_ADC;
+ uint32_t main_clock = get_main_clock();
+ uint32_t clkdiv = 0;
+
+ /* Configure ADC */
+ clkdiv = (main_clock/adc_clk_Val);
+ adc->ctrl |= ((clkdiv & 0x0F) << 8);
+}
+
+
+void adc_on(void)
+{
+ struct lpc_sys_control* sys_ctrl = LPC_SYS_CONTROL;
+ struct lpc_adc* adc = LPC_ADC;
+
+ /* Disable ADC Interrupt */
+ NVIC_DisableIRQ(ADC_IRQ);
+ /* Power-up ADC */
+ sys_ctrl->powerdown_run_cfg &= ~LPC_POWER_DOWN_ADC;
+ /* Provide clock to ADC */
+ subsystem_power(LPC_SYS_ABH_CLK_CTRL_ADC, 1);
+ adc_clk_update();
+
+ /* Prevent unconfigured conversion start */
+ adc->ctrl &= ~LPC_ADC_START_CONV_MASK;
+
+ /* Enable ADC Interrupt */
+ NVIC_EnableIRQ(ADC_IRQ);
+}
+
+void adc_off(void)
+{
+ struct lpc_sys_control* sys_ctrl = LPC_SYS_CONTROL;
+
+ /* Disable ADC Interrupt */
+ NVIC_DisableIRQ(ADC_IRQ);
+ /* Power Down ADC */
+ sys_ctrl->powerdown_run_cfg |= LPC_POWER_DOWN_ADC;
+ /* Remove clock from ADC block */
+ subsystem_power(LPC_SYS_ABH_CLK_CTRL_ADC, 0);
+}
+
ioctrl->pio0_27 = LPC_IO_FUNC_ALT(0) | LPC_IO_MODE_PULL_UP;
ioctrl->pio0_28 = LPC_IO_FUNC_ALT(0) | LPC_IO_MODE_PULL_UP;
ioctrl->pio0_29 = LPC_IO_FUNC_ALT(0) | LPC_IO_MODE_PULL_UP;
- /* Configure ADC pins */
- ioctrl->pio0_30 = LPC_IO_FUNC_ALT(1) | LPC_IO_ANALOG;
- ioctrl->pio0_31 = LPC_IO_FUNC_ALT(1) | LPC_IO_ANALOG;
- ioctrl->pio1_0 = LPC_IO_FUNC_ALT(1) | LPC_IO_ANALOG;
- ioctrl->pio1_1 = LPC_IO_FUNC_ALT(1) | LPC_IO_ANALOG;
- ioctrl->pio1_2 = LPC_IO_FUNC_ALT(1) | LPC_IO_ANALOG;
- ioctrl->pio1_3 = LPC_IO_FUNC_ALT(1) | LPC_IO_ANALOG;
-
+#if 0 /* ADC pins configured in ADC driver. Kept for info, for those not using them as ADC */
+- ioctrl->pio0_30 = LPC_IO_FUNC_ALT(0) | LPC_IO_MODE_PULL_UP;
+- ioctrl->pio0_31 = LPC_IO_FUNC_ALT(0) | LPC_IO_MODE_PULL_UP;
+- ioctrl->pio1_0 = LPC_IO_FUNC_ALT(0) | LPC_IO_MODE_PULL_UP;
+- ioctrl->pio1_1 = LPC_IO_FUNC_ALT(0) | LPC_IO_MODE_PULL_UP;
+- ioctrl->pio1_2 = LPC_IO_FUNC_ALT(0) | LPC_IO_MODE_PULL_UP;
+- ioctrl->pio1_3 = LPC_IO_FUNC_ALT(0) | LPC_IO_MODE_PULL_UP;
+#endif
/* Config done, power off IO_CONFIG block */
io_config_clk_off();
}
};
#define LPC_ADC ((struct lpc_adc *) LPC_ADC_BASE)
+/* ADC Control register bits */
+/* LPC_ADC_CHANNEL_* are also used for interrupt register */
+#define LPC_ADC_CHANNEL_MASK (0xFF << 0)
+#define LPC_ADC_CHANNEL_0 (0x01 << 0)
+#define LPC_ADC_CHANNEL_1 (0x01 << 1)
+#define LPC_ADC_CHANNEL_2 (0x01 << 2)
+#define LPC_ADC_CHANNEL_3 (0x01 << 3)
+#define LPC_ADC_CHANNEL_4 (0x01 << 4)
+#define LPC_ADC_CHANNEL_5 (0x01 << 5)
+#define LPC_ADC_CHANNEL_6 (0x01 << 6)
+#define LPC_ADC_CHANNEL_7 (0x01 << 7)
+#define LPC_ADC_BURST (0x01 << 16)
+/* These are unused for LPC1224 */
#define LPC_ADC_10BITS (0x00 << 17)
-#define LPC_ADC_9BITS (0x01 << 17)
-#define LPC_ADC_8BITS (0x02 << 17)
-#define LPC_ADC_7BITS (0x03 << 17)
-#define LPC_ADC_6BITS (0x04 << 17)
+#define LPC_ADC_9BITS (0x01 << 17)
+#define LPC_ADC_8BITS (0x02 << 17)
+#define LPC_ADC_7BITS (0x03 << 17)
+#define LPC_ADC_6BITS (0x04 << 17)
#define LPC_ADC_START_CONV_NOW (0x01 << 24)
#define LPC_ADC_START_CONV_MASK (0x07 << 24)
-#define LPC_ADC_CONV_AD0 (0x01 << 0)
-
-#define LPC_ADC_INT_EN_AD0 (0x01 << 0)
-
+/* ADC Data register bits */
+#define LPC_ADC_RESULT_SHIFT 6
+#define LPC_ADC_RESULT_MASK 0x3FF
+#define LPC_ADC_OVERRUN (0x01 << 30)
+#define LPC_ADC_CONV_DONE (0x01 << 31)
#endif /* LPC_REGS_H */
--- /dev/null
+/****************************************************************************
+ * drivers/adc.h
+ *
+ * Copyright 2012 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/>.
+ *
+ *************************************************************************** */
+
+
+
+/***************************************************************************** */
+/* Analog to Digital Converter (ADC) */
+/***************************************************************************** */
+
+#include <stdint.h>
+#include "core/lpc_regs_12xx.h"
+#include "core/lpc_core_cm0.h"
+#include "core/system.h"
+
+/* Start a conversion on the given channel (0 to 7) */
+void adc_start_convertion_once(unsigned int channel, int use_int);
+
+/* Read the conversion from the given channel (0 to 7)
+ * This function reads the conversion value directly in the data register and
+ * always returns a value.
+ * Return 1 if the value is a new one, else return 0.
+ * Return -1 if channel does not exist
+ */
+int adc_get_value(uint16_t * val, int channel);
+
+/* Start burst conversions.
+ * channels is a bit mask of requested channels.
+ * Use LPC_ADC_CHANNEL_0 .. 7
+ */
+void adc_start_burst_conversion(uint8_t channels);
+
+/* Unsupported Yet */
+/* This should be used to configure conversion start on falling or rising edges of
+ * some signals, or on timer for burst conversions.
+ */
+void adc_prepare_conversion_on_event(void);
+
+/* On LPC1224 there is no possibility to change the ADC resolution */
+void adc_set_resolution(int bits);
+
+
+/***************************************************************************** */
+/* ADC Setup : private part : Clocks, Pins, Power and Mode */
+void set_adc_pins(void);
+void adc_clk_update(void);
+void adc_on(void);
+void adc_off(void);
+
