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pru: Add support for ADC input

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2017-05-11 14:53:00 -04:00
parent b85755c0ff
commit c9b6662138
7 changed files with 165 additions and 5 deletions
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45
src/pru/pru0.c
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@@ -8,6 +8,7 @@
#include <string.h> // memset
#include <pru/io.h> // write_r31
#include <pru_cfg.h> // CT_CFG
#include <pru_iep.h> // CT_IEP
#include <pru_intc.h> // CT_INTC
#include <pru_rpmsg.h> // pru_rpmsg_send
#include <pru_virtio_ids.h> // VIRTIO_ID_RPMSG
@@ -76,6 +77,44 @@ process_io(struct pru_rpmsg_transport *transport)
}
/****************************************************************
* Peripheral reset
****************************************************************/
static void
timer_reset(void)
{
CT_IEP.TMR_CMP_CFG = 0x01 << 1;
CT_IEP.TMR_GLB_CFG = 0x11;
}
static void
adc_reset(void)
{
// Disable ADC
ADC->ctrl = (1<<2);
barrier();
// Clear registers
ADC->irqstatus = 0xffffffff;
ADC->irqenable_clr = 0xffffffff;
ADC->dmaenable_clr = 0xffffffff;
ADC->adc_clkdiv = 0;
ADC->stepenable = 0;
ADC->idleconfig = 0;
int i;
for (i=0; i<8; i++) {
ADC->step[i].config = i<<19;
ADC->step[i].delay = 0;
}
// Enable ADC
barrier();
writel(&ADC->ctrl, 0x07);
// Drain fifo
while (readl(&ADC->fifo0count))
readl(&ADC->fifo0data);
}
/****************************************************************
* Resource table
****************************************************************/
@@ -218,8 +257,12 @@ main(void)
, CHAN_DESC, CHAN_PORT) != PRU_RPMSG_SUCCESS)
;
// Wait for PRU1 to be ready
// Reset peripherals
memset(SHARED_MEM, 0, sizeof(*SHARED_MEM));
timer_reset();
adc_reset();
// Wait for PRU1 to be ready
writel(&SHARED_MEM->signal, SIGNAL_PRU0_WAITING);
while (readl(&SHARED_MEM->signal) != SIGNAL_PRU1_READY)
;