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286 lignes
7.2 KiB
286 lignes
7.2 KiB
#pragma once
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#include <libopencm3/cm3/common.h>
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#include <libopencm3/stm32/f3/memorymap.h>
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// Opamp base address (just one register)
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#define OPAMP1_BASE OPAMP_BASE + 0x38
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#define OPAMP2_BASE OPAMP_BASE + 0x3C
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#define OPAMP3_BASE OPAMP_BASE + 0x40
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#define OPAMP4_BASE OPAMP_BASE + 0x44
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// opamp constants
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#define OPAMP1 OPAMP1_BASE
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#define OPAMP2 OPAMP2_BASE
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#define OPAMP3 OPAMP3_BASE
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#define OPAMP4 OPAMP4_BASE
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#define OPAMP_CSR(opamp_base) MMIO32(opamp_base + 0)
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#define OPAMP_CSR_LOCK (1 << 31)
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#define OPAMP_CSR_OUTCAL (1 << 30)
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#define OPAMP_CSR_TSTREF (1 << 29)
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// trim registers
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#define OPAMP_CSR_TRIMOFFSETN_SHIFT 24
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#define OPAMP_CSR_TRIMOFFSETP_SHIFT 19
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#define OPAMP_CSR_TRIMOFFSETN_MSK (0x1F << OPAMP_CSR_TRIMOFFSETN_SHIFT)
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#define OPAMP_CSR_TRIMOFFSETP_MSK (0x1F << OPAMP_CSR_TRIMOFFSETP_SHIFT)
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// user trim
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#define OPAMP_CSR_USER_TRIM (1 << 18)
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// PGA gain
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#define OPAMP_CSR_PGA_GAIN_SHIFT 14
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#define OPAMP_CSR_PGA_GAIN_MSK (0b0011 << OPAMP_CSR_PGA_GAIN_SHIFT)
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#define OPAMP_CSR_PGA_MIDPOINT_MSK (0b1100 << OPAMP_CSR_PGA_GAIN_SHIFT)
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// lower two bits
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enum OPAMP_PGA_GAIN {
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OPAMP_PGA_GAIN_2 = (0 << OPAMP_CSR_PGA_GAIN_SHIFT),
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OPAMP_PGA_GAIN_4 = (1 << OPAMP_CSR_PGA_GAIN_SHIFT),
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OPAMP_PGA_GAIN_8 = (2 << OPAMP_CSR_PGA_GAIN_SHIFT),
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OPAMP_PGA_GAIN_16 = (3 << OPAMP_CSR_PGA_GAIN_SHIFT)
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};
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// Masks that can be used to adjust PGA value
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enum OPAMP_PGA_MIDPOINT {
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OPAMP_PGA_MIDPOINT_NONE = 0,
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OPAMP_PGA_MIDPOINT_VM0 = (0b1000 << OPAMP_CSR_PGA_GAIN_SHIFT),
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OPAMP_PGA_MIDPOINT_VM1 = (0b1100 << OPAMP_CSR_PGA_GAIN_SHIFT)
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};
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// Calibration select
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#define OPAMP_CSR_CALSEL_SHIFT 12
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#define OPAMP_CSR_CALSEL_MSK (0b11 << OPAMP_CSR_CALSEL_SHIFT)
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enum OPAMP_CALSEL {
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OPAMP_CALSEL_3P3 = (0 << OPAMP_CSR_CALSEL_SHIFT),
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OPAMP_CALSEL_10 = (1 << OPAMP_CSR_CALSEL_SHIFT),
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OPAMP_CALSEL_50 = (2 << OPAMP_CSR_CALSEL_SHIFT),
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OPAMP_CALSEL_90 = (3 << OPAMP_CSR_CALSEL_SHIFT),
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};
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// Cal On
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#define OPAMP_CSR_CALON (1 << 11)
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// Non-inverting input, secondary
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#define OPAMP_CSR_VPS_SEL_SHIFT 9
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#define OPAMP_CSR_VPS_SEL_MSK (0b11 << OPAMP_CSR_VPS_SEL_SHIFT)
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enum OPAMP_VPS_SEL {
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OPAMP_VPS_SEL_VP0 = (0 << OPAMP_CSR_VPS_SEL_SHIFT),
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OPAMP_VPS_SEL_VP1 = (1 << OPAMP_CSR_VPS_SEL_SHIFT),
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OPAMP_VPS_SEL_VP2 = (2 << OPAMP_CSR_VPS_SEL_SHIFT),
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OPAMP_VPS_SEL_VP3 = (3 << OPAMP_CSR_VPS_SEL_SHIFT),
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// The following are just aliases for convenience, mapped for F303.
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// probably should not be included in the library, as they're too specific.
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// same for the following enums.
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OPAMP1_VPS_SEL_PA7 = OPAMP_VPS_SEL_VP0,
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OPAMP1_VPS_SEL_PA5 = OPAMP_VPS_SEL_VP1,
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OPAMP1_VPS_SEL_PA3 = OPAMP_VPS_SEL_VP2,
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OPAMP1_VPS_SEL_PA1 = OPAMP_VPS_SEL_VP3,
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OPAMP2_VPS_SEL_PD14 = OPAMP_VPS_SEL_VP0,
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OPAMP2_VPS_SEL_PB14 = OPAMP_VPS_SEL_VP1,
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OPAMP2_VPS_SEL_PB0 = OPAMP_VPS_SEL_VP2,
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OPAMP2_VPS_SEL_PA7 = OPAMP_VPS_SEL_VP3,
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OPAMP3_VPS_SEL_PB13 = OPAMP_VPS_SEL_VP0,
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OPAMP3_VPS_SEL_PA5 = OPAMP_VPS_SEL_VP1,
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OPAMP3_VPS_SEL_PA1 = OPAMP_VPS_SEL_VP2,
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OPAMP3_VPS_SEL_PB0 = OPAMP_VPS_SEL_VP3,
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OPAMP4_VPS_SEL_PD11 = OPAMP_VPS_SEL_VP0,
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OPAMP4_VPS_SEL_PB11 = OPAMP_VPS_SEL_VP1,
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OPAMP4_VPS_SEL_PA4 = OPAMP_VPS_SEL_VP2,
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OPAMP4_VPS_SEL_PB13 = OPAMP_VPS_SEL_VP3
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};
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// Inverting input, secondary
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#define OPAMP_CSR_VMS_SEL_SHIFT 8
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#define OPAMP_CSR_VMS_SEL_MSK (1 << OPAMP_CSR_VMS_SEL_SHIFT)
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enum OPAMP_VMS_SEL {
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OPAMP_VMS_SEL_VM0 = (0 << OPAMP_CSR_VMS_SEL_SHIFT),
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OPAMP_VMS_SEL_VM1 = (1 << OPAMP_CSR_VMS_SEL_SHIFT),
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OPAMP1_VMS_SEL_PC5 = OPAMP_VMS_SEL_VM0,
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OPAMP1_VMS_SEL_PA3 = OPAMP_VMS_SEL_VM1,
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OPAMP2_VMS_SEL_PC5 = OPAMP_VMS_SEL_VM0,
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OPAMP2_VMS_SEL_PA5 = OPAMP_VMS_SEL_VM1,
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OPAMP3_VMS_SEL_PB10 = OPAMP_VMS_SEL_VM0,
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OPAMP3_VMS_SEL_PB2 = OPAMP_VMS_SEL_VM1,
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OPAMP4_VMS_SEL_PB10 = OPAMP_VMS_SEL_VM0,
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OPAMP4_VMS_SEL_PD8 = OPAMP_VMS_SEL_VM1,
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};
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// Cal On
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#define OPAMP_CSR_TCM_EN (1 << 7)
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// Inverting input, primary
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#define OPAMP_CSR_VM_SEL_SHIFT 5
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#define OPAMP_CSR_VM_SEL_MSK (0b11 << OPAMP_CSR_VM_SEL_SHIFT)
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enum OPAMP_VM_SEL {
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OPAMP_VM_SEL_VM0 = (0 << OPAMP_CSR_VM_SEL_SHIFT),
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OPAMP_VM_SEL_VM1 = (1 << OPAMP_CSR_VM_SEL_SHIFT),
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OPAMP_VM_SEL_PGA = (2 << OPAMP_CSR_VM_SEL_SHIFT),
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OPAMP_VM_SEL_FLW = (3 << OPAMP_CSR_VM_SEL_SHIFT),
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OPAMP1_VM_SEL_PC5 = OPAMP_VM_SEL_VM0,
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OPAMP1_VM_SEL_PA3 = OPAMP_VM_SEL_VM1,
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OPAMP1_VM_SEL_PGA = OPAMP_VM_SEL_PGA,
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OPAMP1_VM_SEL_FLW = OPAMP_VM_SEL_FLW,
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OPAMP2_VM_SEL_PC5 = OPAMP_VM_SEL_VM0,
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OPAMP2_VM_SEL_PA5 = OPAMP_VM_SEL_VM1,
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OPAMP2_VM_SEL_PGA = OPAMP_VM_SEL_PGA,
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OPAMP2_VM_SEL_FLW = OPAMP_VM_SEL_FLW,
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OPAMP3_VM_SEL_PB10 = OPAMP_VM_SEL_VM0,
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OPAMP3_VM_SEL_PB2 = OPAMP_VM_SEL_VM1,
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OPAMP3_VM_SEL_PGA = OPAMP_VM_SEL_PGA,
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OPAMP3_VM_SEL_FLW = OPAMP_VM_SEL_FLW,
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OPAMP4_VM_SEL_PB10 = OPAMP_VM_SEL_VM0,
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OPAMP4_VM_SEL_PD8 = OPAMP_VM_SEL_VM1,
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OPAMP4_VM_SEL_PGA = OPAMP_VM_SEL_PGA,
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OPAMP4_VM_SEL_FLW = OPAMP_VM_SEL_FLW,
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};
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// Non-inverting input, primary
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#define OPAMP_CSR_VP_SEL_SHIFT 2
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#define OPAMP_CSR_VP_SEL_MSK (0b11 << OPAMP_CSR_VP_SEL_SHIFT)
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enum OPAMP_VP_SEL {
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OPAMP_VP_SEL_VP0 = (0 << OPAMP_CSR_VP_SEL_SHIFT),
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OPAMP_VP_SEL_VP1 = (1 << OPAMP_CSR_VP_SEL_SHIFT),
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OPAMP_VP_SEL_VP2 = (2 << OPAMP_CSR_VP_SEL_SHIFT),
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OPAMP_VP_SEL_VP3 = (3 << OPAMP_CSR_VP_SEL_SHIFT),
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OPAMP1_VP_SEL_PA7 = OPAMP_VP_SEL_VP0,
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OPAMP1_VP_SEL_PA5 = OPAMP_VP_SEL_VP1,
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OPAMP1_VP_SEL_PA3 = OPAMP_VP_SEL_VP2,
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OPAMP1_VP_SEL_PA1 = OPAMP_VP_SEL_VP3,
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OPAMP2_VP_SEL_PD14 = OPAMP_VP_SEL_VP0,
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OPAMP2_VP_SEL_PB14 = OPAMP_VP_SEL_VP1,
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OPAMP2_VP_SEL_PB0 = OPAMP_VP_SEL_VP2,
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OPAMP2_VP_SEL_PA7 = OPAMP_VP_SEL_VP3,
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OPAMP3_VP_SEL_PB13 = OPAMP_VP_SEL_VP0,
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OPAMP3_VP_SEL_PA5 = OPAMP_VP_SEL_VP1,
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OPAMP3_VP_SEL_PA1 = OPAMP_VP_SEL_VP2,
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OPAMP3_VP_SEL_PB0 = OPAMP_VP_SEL_VP3,
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OPAMP4_VP_SEL_PD11 = OPAMP_VP_SEL_VP0,
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OPAMP4_VP_SEL_PB11 = OPAMP_VP_SEL_VP1,
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OPAMP4_VP_SEL_PA4 = OPAMP_VP_SEL_VP2,
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OPAMP4_VP_SEL_PB13 = OPAMP_VP_SEL_VP3
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};
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// Forve VP - VP connected to calibration reference
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#define OPAMP_CSR_FORCE_VP (1 << 1)
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// Enable opamp
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#define OPAMP_CSR_OPAMPEN (1 << 0)
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// -------------- Functions ----------------
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/** Lock the opamp config. No way to unlock until restart. */
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void opamp_lock(uint32_t opamp);
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/**
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* Enable OPAMP
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* Must also enable RCC_SYSCFG_COMP in RCC
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*/
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void opamp_enable(uint32_t opamp);
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/** Disable OPAMP */
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void opamp_disable(uint32_t opamp);
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/** Send reference to ADC input channel */
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void opamp_ref_to_adc(uint32_t opamp, bool yes);
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/** Send reference to non-inverting input */
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void opamp_ref_to_vp(uint32_t opamp, bool yes);
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/**
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* Set PGA gain.
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* To use PGA, call opamp_mode_pga() first.
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*/
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void opamp_pga_set_gain(uint32_t opamp, enum OPAMP_PGA_GAIN gain);
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/** Set PGA midpoint routing */
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void opamp_pga_set_midpoint(uint32_t opamp, enum OPAMP_PGA_MIDPOINT midpoint);
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/** Connect VM pin (can be used to select follower and PGA mode) */
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void opamp_vm_select(uint32_t opamp, enum OPAMP_VM_SEL vm);
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/** Connect the VP pin */
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void opamp_vp_select(uint32_t opamp, enum OPAMP_VP_SEL vp);
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/**
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* Set opamp to PGA mode (shortcut function)
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* Midpoint can be connected to VM pins with opamp_pga_set_midpoint()
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*/
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void opamp_mode_pga(uint32_t opamp);
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/**
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* Set opamp to follower mode (shortcut function).
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* VM is not connected to GPIO in this mode.
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*/
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void opamp_mode_follower(uint32_t opamp);
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/** Select reference value to use */
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void opamp_ref_select(uint32_t opamp, enum OPAMP_CALSEL ref);
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/** Calibrate an OpAmp */
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bool opamp_calibrate(uint32_t opamp);
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