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Added U powersave files

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Ross Owen
2013-11-05 16:35:42 +00:00
parent 0297eb1f5a
commit 2f233d7b29
2 changed files with 71 additions and 0 deletions
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62
module_usb_audio/powersave/archU_powerSaving.xc Normal file
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#ifdef XUD_ON_U_SERIES
#include "archU_powerSaving.h"
#include <xs1.h>
#include <xs1_l_registers.h>
#include <xs1_su_registers.h>
#include <platform.h>
#ifndef VOLTAGE_REDUCTION_mV
#define VOLTAGE_REDUCTION_mV 20
#endif
unsigned get_tile_id(tileref t); // Required for use with 12.0 tools. get_tile_id() available in xs1.h with 13.0 tools.
#define ARCH_U_VOLTAGE_FIRST_STEP 39 // First step down from 1V
#define ARCH_U_SSWITCH_PRESCALER 8 // Sswitch down to 1/8 clk freq
void archU_powerSaving()
{
if (get_local_tile_id() == get_tile_id(tile[0]))
{
unsigned writeval[1];
unsigned char writevalc[1];
// Reduce the VDDCORE voltage level
for (unsigned count=0; count < (VOLTAGE_REDUCTION_mV/10); count++)
{
timer t;
int time;
writeval[0] = (ARCH_U_VOLTAGE_FIRST_STEP - count);
write_periph_32(usb_tile, XS1_SU_PER_PWR_CHANEND_NUM, XS1_SU_PER_PWR_VOUT1_LVL_NUM, 1, writeval);
t :> time;
time += (1 * PLATFORM_REFERENCE_MHZ); // Wait 1us per step
t when timerafter(time) :> void;
}
// Set switch prescaler down
write_node_config_reg(tile[0], XS1_SSWITCH_CLK_DIVIDER_NUM, (ARCH_U_SSWITCH_PRESCALER - 1)); // PLL clk will be divided by value + 1
// Both DC-DCs in PWM mode, I/O and PLL supply on, Analogue & core on
writeval[0] = XS1_SU_PWR_VOUT1_EN_SET(0, 1);
writeval[0] = XS1_SU_PWR_VOUT2_EN_SET(writeval[0], 1);
writeval[0] = XS1_SU_PWR_VOUT5_EN_SET(writeval[0], 1);
writeval[0] = XS1_SU_PWR_VOUT6_EN_SET(writeval[0], 1);
write_periph_32(usb_tile, XS1_SU_PER_PWR_CHANEND_NUM, XS1_SU_PER_PWR_STATE_AWAKE_NUM, 1, writeval);
// USB suspend off, voltage adjustable, sleep clock 32KHz
writeval[0] = XS1_SU_PWR_USB_PD_EN_SET(0, 1);
writeval[0] = XS1_SU_PWR_RST_VOUT_LVL_SET(writeval[0], 1);
writeval[0] = XS1_SU_PWR_LD_AWAKE_SET(writeval[0], 1);
write_periph_32(usb_tile, XS1_SU_PER_PWR_CHANEND_NUM, XS1_SU_PER_PWR_MISC_CTRL_NUM, 1, writeval);
// Turn off on-chip silicon oscillator (20MHz or 32KHz)
writevalc[0] = XS1_SU_ON_SI_OSC_EN_SET(0, 1);
writevalc[0] = XS1_SU_ON_SI_OSC_SLOW_SET(writevalc[0], 1);
write_periph_8(usb_tile, XS1_SU_PER_OSC_CHANEND_NUM, XS1_SU_PER_OSC_ON_SI_CTRL_NUM, 1, writevalc);
}
}
#endif