1 /*******************************************************************************
2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
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11 * The above copyright notice and this permission notice shall be included
12 * in all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
22 * Except as contained in this notice, the name of Maxim Integrated
23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
24 * Products, Inc. Branding Policy.
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31 *******************************************************************************
34 #include "mbed_assert.h"
35 #include "analogout_api.h"
36 #include "clkman_regs.h"
37 #include "pwrman_regs.h"
39 #include "PeripheralPins.h"
41 //******************************************************************************
42 void analogout_init(dac_t
*obj
, PinName pin
)
44 // Make sure pin is an analog pin we can use for ADC
45 DACName dac
= (DACName
)pinmap_peripheral(pin
, PinMap_DAC
);
46 MBED_ASSERT((DACName
)dac
!= (DACName
)NC
);
48 // Set the object pointer
49 obj
->dac
= ((mxc_dac_regs_t
*)MXC_DAC_GET_DAC((pin
& 0x3)));
50 obj
->dac_fifo
= ((mxc_dac_fifo_t
*)MXC_DAC_GET_FIFO((pin
& 0x3)));
51 obj
->index
= (pin
& 0x3);
53 // Set the ADC clock to the system clock frequency
54 MXC_SET_FIELD(&MXC_CLKMAN
->clk_ctrl
, MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT
,
55 (MXC_F_CLKMAN_CLK_CTRL_ADC_GATE_N
| (MXC_E_CLKMAN_ADC_SOURCE_SELECT_SYSTEM
<<
56 MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT_POS
)));
59 // Setup the OPAMP in follower mode
63 MXC_CLKMAN
->clk_ctrl_14_dac0
= MXC_E_CLKMAN_CLK_SCALE_ENABLED
;
66 MXC_AFE
->ctrl5
&= ~MXC_F_AFE_CTRL5_OP_CMP0
;
68 // Set the positive and negative inputs
69 MXC_SET_FIELD(&MXC_AFE
->ctrl4
, (MXC_F_AFE_CTRL4_DAC_SEL_A
|
70 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP0
| MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP0
),
71 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP0_POS
) |
72 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP0_POS
) |
73 (0x0 << MXC_F_AFE_CTRL4_DAC_SEL_A_POS
)));
75 // Enable N and P channel inputs
76 MXC_AFE
->ctrl3
|= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP0
|
77 MXC_F_AFE_CTRL3_EN_NCH_OPAMP0
);
81 MXC_CLKMAN
->clk_ctrl_15_dac1
= MXC_E_CLKMAN_CLK_SCALE_ENABLED
;
84 MXC_AFE
->ctrl5
&= ~MXC_F_AFE_CTRL5_OP_CMP1
;
86 // Set the positive and negative inputs
87 MXC_SET_FIELD(&MXC_AFE
->ctrl4
, (MXC_F_AFE_CTRL4_DAC_SEL_B
|
88 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP1
| MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP1
),
89 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP1_POS
) |
90 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP1_POS
) |
91 (0x1 << MXC_F_AFE_CTRL4_DAC_SEL_B_POS
)));
93 // Enable N and P channel inputs
94 MXC_AFE
->ctrl3
|= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP1
|
95 MXC_F_AFE_CTRL3_EN_NCH_OPAMP1
);
100 MXC_CLKMAN
->clk_ctrl_16_dac2
= MXC_E_CLKMAN_CLK_SCALE_ENABLED
;
103 MXC_AFE
->ctrl5
&= ~MXC_F_AFE_CTRL5_OP_CMP2
;
105 // Set the positive and negative inputs
106 MXC_SET_FIELD(&MXC_AFE
->ctrl4
, (MXC_F_AFE_CTRL4_DAC_SEL_C
|
107 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP2
| MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP2
),
108 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP2_POS
) |
109 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP2_POS
) |
110 (0x2 << MXC_F_AFE_CTRL4_DAC_SEL_C_POS
)));
112 // Enable N and P channel inputs
113 MXC_AFE
->ctrl3
|= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP2
|
114 MXC_F_AFE_CTRL3_EN_NCH_OPAMP2
);
118 MXC_CLKMAN
->clk_ctrl_17_dac3
= MXC_E_CLKMAN_CLK_SCALE_ENABLED
;
121 MXC_AFE
->ctrl5
&= ~MXC_F_AFE_CTRL5_OP_CMP3
;
123 // Set the positive and negative inputs
124 MXC_SET_FIELD(&MXC_AFE
->ctrl4
, (MXC_F_AFE_CTRL4_DAC_SEL_D
|
125 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP3
| MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP3
),
126 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP3_POS
) |
127 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP3_POS
) |
128 (0x3 << MXC_F_AFE_CTRL4_DAC_SEL_D_POS
)));
130 // Enable N and P channel inputs
131 MXC_AFE
->ctrl3
|= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP3
|
132 MXC_F_AFE_CTRL3_EN_NCH_OPAMP3
);
137 MXC_PWRMAN
->pwr_rst_ctrl
|= MXC_F_PWRMAN_PWR_RST_CTRL_AFE_POWERED
;
139 // Setup internal voltage references
140 MXC_SET_FIELD(&MXC_AFE
->ctrl1
, (MXC_F_AFE_CTRL1_REF_DAC_VOLT_SEL
| MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL
),
141 (MXC_F_AFE_CTRL1_REF_ADC_POWERUP
| MXC_F_AFE_CTRL1_REF_BLK_POWERUP
|
142 (MXC_E_AFE_REF_VOLT_SEL_1500
<< MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL_POS
)));
144 // Disable interpolation
145 obj
->dac
->ctrl0
&= MXC_F_DAC_CTRL0_INTERP_MODE
;
148 //******************************************************************************
149 void analogout_write(dac_t
*obj
, float value
)
151 analogout_write_u16(obj
, (uint16_t)((value
/1.0) * 0xFFFF));
154 //******************************************************************************
155 void analogout_write_u16(dac_t
*obj
, uint16_t value
)
158 // Setup the OPAMP in follower mode
161 MXC_AFE
->ctrl3
|= MXC_F_AFE_CTRL3_POWERUP_OPAMP0
;
164 MXC_AFE
->ctrl3
|= MXC_F_AFE_CTRL3_POWERUP_OPAMP1
;
167 MXC_AFE
->ctrl3
|= MXC_F_AFE_CTRL3_POWERUP_OPAMP2
;
170 MXC_AFE
->ctrl3
|= MXC_F_AFE_CTRL3_POWERUP_OPAMP3
;
174 // Output 1 sample with minimal delay
175 obj
->dac
->rate
|= 0x1;
177 // Set the start mode to output once data is in the FIFO
178 obj
->dac
->ctrl0
&= ~(MXC_F_DAC_CTRL0_START_MODE
| MXC_F_DAC_CTRL0_OP_MODE
);
181 obj
->dac
->ctrl0
|= (MXC_F_DAC_CTRL0_POWER_MODE_2
|
182 MXC_F_DAC_CTRL0_POWER_MODE_1_0
| MXC_F_DAC_CTRL0_POWER_ON
|
183 MXC_F_DAC_CTRL0_CLOCK_GATE_EN
| MXC_F_DAC_CTRL0_CPU_START
);
187 obj
->dac_fifo
->output_16
= (obj
->out
);
190 // Convert 16 bits to 8 bits
191 obj
->out
= (value
>> 8);
192 obj
->dac_fifo
->output_8
= (obj
->out
);
196 //******************************************************************************
197 float analogout_read(dac_t
*obj
)
199 return (((float)analogout_read_u16(obj
) / (float)0xFFFF) * 1.5);
202 //******************************************************************************
203 uint16_t analogout_read_u16(dac_t
*obj
)
206 // Convert 12 bits to 16 bits
207 return (obj
->out
<< 4);
209 // Convert 8 bits to 16 bits
210 return (obj
->out
<< 8);