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example-fs-bb48: Only use LS-8-bit

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NIIBE Yutaka
2016-05-26 17:29:06 +09:00
parent 91823d0fc1
commit d81767b7c7
2 changed files with 47 additions and 9 deletions
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2
ChangeLog
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@@ -3,6 +3,8 @@
* mcu/kl_sim.h: New (was in example-fs-bb48).
* example-fs-bb48/adc_kl27z.c: Use DMA0 and DMA1.
* example-fs-bb48/adc_kl27z.c (adc_wait_completion): Use only
least significant 8-bit (most significant for randomness).
* example-fs-bb48/command.c (cmd_adc): Rename from
cmd_temperature.

44
example-fs-bb48/adc_kl27z.c
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@@ -1,6 +1,7 @@
/*
* adc_kl27z.c - ADC driver for KL27Z
* In this ADC driver, there are NeuG specific parts.
* It only records lower 8-bit of 16-bit data.
* You need to modify to use this as generic ADC driver.
*
* Copyright (C) 2016 Flying Stone Technology
@@ -157,6 +158,13 @@ static const uint32_t adc0_sc1_setting = ADC_SC1_TEMPSENSOR;
static chopstx_intr_t adc_intr;
struct adc_internal {
uint32_t buf[64];
uint8_t *p;
int phase : 8;
int count : 8;
};
struct adc_internal adc;
/*
* Initialize ADC module, do calibration.
@@ -165,7 +173,7 @@ static chopstx_intr_t adc_intr;
* other threads (to be accurate).
*
* We configure ADC0 to kick DMA0, configure DMA0 to kick DMA1.
* DMA0 records output of ADC0 to the ADC_BUF.
* DMA0 records output of ADC0 to the ADC.BUF.
* DMA1 kicks ADC0 again to get another value.
*
* ADC0 --[finish conversion]--> DMA0 --[Link channel 1]--> DMA1
@@ -236,11 +244,11 @@ adc_start (void)
* Kick getting data for COUNT times.
* Data will be saved in ADC_BUF starting at OFFSET.
*/
void
adc_start_conversion (int offset, int count)
static void
adc_start_conversion_internal (int count)
{
/* DMA0 setting. */
DMA0->DAR = (uint32_t)&adc_buf[offset];
DMA0->DAR = (uint32_t)&adc.buf[0];
DMA0->DSR_BCR = 4 * count;
DMA0->DCR = (1 << 31) | (1 << 30) | (1 << 29) | (0 << 20) | (1 << 19)
| (0 << 17) | (1 << 7) | (2 << 4) | (1 << 2);
@@ -251,6 +259,20 @@ adc_start_conversion (int offset, int count)
}
/*
* Kick getting data for COUNT times.
* Data will be saved in ADC_BUF starting at OFFSET.
*/
void
adc_start_conversion (int offset, int count)
{
adc.p = (uint8_t *)&adc_buf[offset];
adc.phase = 0;
adc.count = count;
adc_start_conversion_internal (count);
}
static void
adc_stop_conversion (void)
{
@@ -273,6 +295,10 @@ adc_stop (void)
int
adc_wait_completion (void)
{
while (1)
{
int i;
/* Wait DMA completion */
chopstx_poll (NULL, 1, &adc_intr);
@@ -280,5 +306,15 @@ adc_wait_completion (void)
DMA1->DSR_BCR = (1 << 24);
adc_stop_conversion ();
for (i = 0; i < adc.count; i++)
*adc.p++ = (uint8_t)adc.buf[i];
if (++adc.phase >= 4)
break;
adc_start_conversion_internal (adc.count);
}
return 0;
}