75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
#include <string.h>
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#include "platform_rmt.h"
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#include "driver/rmt.h"
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static uint8_t rmt_channel_alloc[RMT_CHANNEL_MAX];
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static bool rmt_channel_check( uint8_t channel, uint8_t num_mem )
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{
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if (num_mem == 0 || channel >= RMT_CHANNEL_MAX) {
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// wrong parameter
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return false;
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} else if (num_mem == 1) {
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if (rmt_channel_alloc[channel] == 0)
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return true;
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else
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return false;
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}
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return rmt_channel_check( channel-1, num_mem-1);
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}
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int platform_rmt_allocate( uint8_t num_mem, rmt_mode_t mode )
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{
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int channel;
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int alloc_min;
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int alloc_max;
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uint8_t tag = 1;
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#if SOC_RMT_TX_CANDIDATES_PER_GROUP == SOC_RMT_CHANNELS_PER_GROUP
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alloc_min = 0;
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alloc_max = RMT_CHANNEL_MAX - 1;
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#else
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/* On platforms where channels cannot do both TX and RX, the TX ones always
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seem to start at index 0, and are then followed by the RX channels. */
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if( mode==RMT_MODE_TX ) {
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alloc_min = 0;
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alloc_max = SOC_RMT_TX_CANDIDATES_PER_GROUP - 1;
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} else {
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alloc_min = RMT_CHANNEL_MAX - SOC_RMT_RX_CANDIDATES_PER_GROUP;
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alloc_max = RMT_CHANNEL_MAX - 1;
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}
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#endif
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for (channel = alloc_max; channel >= alloc_min; channel--) {
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if (rmt_channel_alloc[channel] == 0) {
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if (rmt_channel_check( channel, num_mem )) {
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rmt_channel_alloc[channel] = tag++;
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if (--num_mem == 0)
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break;
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}
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}
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}
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if (channel >= 0 && num_mem == 0)
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return channel;
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else
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return -1;
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}
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void platform_rmt_release( uint8_t channel )
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{
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for ( ; channel < RMT_CHANNEL_MAX; channel++ ) {
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uint8_t tag = rmt_channel_alloc[channel];
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rmt_channel_alloc[channel] = 0;
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if (tag <= 1)
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break;
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}
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}
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