forked from PAWPAW-Mirror/lib_xua
63 lines
2.4 KiB
Plaintext
63 lines
2.4 KiB
Plaintext
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#ifdef XUD_ON_U_SERIES
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#include "archU_powerSaving.h"
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#include <xs1.h>
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#include <xs1_l_registers.h>
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#include <xs1_su_registers.h>
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#include <platform.h>
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#ifndef VOLTAGE_REDUCTION_mV
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#define VOLTAGE_REDUCTION_mV 20
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#endif
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unsigned get_tile_id(tileref t); // Required for use with 12.0 tools. get_tile_id() available in xs1.h with 13.0 tools.
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#define ARCH_U_VOLTAGE_FIRST_STEP 39 // First step down from 1V
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#define ARCH_U_SSWITCH_PRESCALER 8 // Sswitch down to 1/8 clk freq
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void archU_powerSaving()
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{
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if (get_local_tile_id() == get_tile_id(tile[0]))
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{
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unsigned writeval[1];
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unsigned char writevalc[1];
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// Reduce the VDDCORE voltage level
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for (unsigned count=0; count < (VOLTAGE_REDUCTION_mV/10); count++)
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{
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timer t;
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int time;
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writeval[0] = (ARCH_U_VOLTAGE_FIRST_STEP - count);
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write_periph_32(usb_tile, XS1_SU_PER_PWR_CHANEND_NUM, XS1_SU_PER_PWR_VOUT1_LVL_NUM, 1, writeval);
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t :> time;
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time += (1 * PLATFORM_REFERENCE_MHZ); // Wait 1us per step
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t when timerafter(time) :> void;
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}
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// Set switch prescaler down
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write_node_config_reg(tile[0], XS1_SSWITCH_CLK_DIVIDER_NUM, (ARCH_U_SSWITCH_PRESCALER - 1)); // PLL clk will be divided by value + 1
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// Both DC-DCs in PWM mode, I/O and PLL supply on, Analogue & core on
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writeval[0] = XS1_SU_PWR_VOUT1_EN_SET(0, 1);
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writeval[0] = XS1_SU_PWR_VOUT2_EN_SET(writeval[0], 1);
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writeval[0] = XS1_SU_PWR_VOUT5_EN_SET(writeval[0], 1);
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writeval[0] = XS1_SU_PWR_VOUT6_EN_SET(writeval[0], 1);
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write_periph_32(usb_tile, XS1_SU_PER_PWR_CHANEND_NUM, XS1_SU_PER_PWR_STATE_AWAKE_NUM, 1, writeval);
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// USB suspend off, voltage adjustable, sleep clock 32KHz
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writeval[0] = XS1_SU_PWR_USB_PD_EN_SET(0, 1);
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writeval[0] = XS1_SU_PWR_RST_VOUT_LVL_SET(writeval[0], 1);
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writeval[0] = XS1_SU_PWR_LD_AWAKE_SET(writeval[0], 1);
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write_periph_32(usb_tile, XS1_SU_PER_PWR_CHANEND_NUM, XS1_SU_PER_PWR_MISC_CTRL_NUM, 1, writeval);
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// Turn off on-chip silicon oscillator (20MHz or 32KHz)
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writevalc[0] = XS1_SU_ON_SI_OSC_EN_SET(0, 1);
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writevalc[0] = XS1_SU_ON_SI_OSC_SLOW_SET(writevalc[0], 1);
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write_periph_8(usb_tile, XS1_SU_PER_OSC_CHANEND_NUM, XS1_SU_PER_OSC_ON_SI_CTRL_NUM, 1, writevalc);
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}
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}
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#endif
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