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fix to correctly use multiple input channels

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This commit is contained in:
James Snyder 2009-01-22 03:25:09 +00:00
parent 150005cad9
commit 569a9f69e7
1 changed files with 8 additions and 5 deletions
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13
src/platform/lm3s/platform.c
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@ -80,7 +80,7 @@ int platform_init()
pwms_init();
// Setup ADCs
adcs_init();
adcs_init();
// Setup ethernet (TCP/IP)
eth_init();
@ -481,7 +481,8 @@ void platform_cpu_disable_interrupts()
// *****************************************************************************
// ADC specific functions
/*int platform_adc_exists( unsigned id ); generic, it will be part of src/common.c */
const static u32 adc_ctls[] = { ADC_CTL_CH0, ADC_CTL_CH1, ADC_CTL_CH2, ADC_CTL_CH3 };
static void adcs_init(unsigned id)
{
@ -520,6 +521,7 @@ int platform_adc_is_done( unsigned id ) /* returns 1 if the conversion on the sp
return !ADCIntStatus(ADC_BASE, id, false);
}
void platform_adc_set_mode( unsigned id, int mode ) /* sets the mode on the specified ADC channel to either "single shot" or "continuous" */
{
/* currently mode is ignored... acquisition is currently just single-shot */
@ -527,11 +529,12 @@ void platform_adc_set_mode( unsigned id, int mode ) /* sets the mode on the spec
/* Stop sequencer we're going to adjust */
ADCSequenceDisable(ADC_BASE, id);
/* Set sequence id to be triggered by processor, with priority 0 */
/* Not sure what happens if priority is nonzero, just make priority tied to id number */
/* Set sequence id to be triggered by processor, with priority id */
ADCSequenceConfigure(ADC_BASE, id, ADC_TRIGGER_PROCESSOR, id);
ADCSequenceStepConfigure(ADC_BASE, id, 0, ADC_CTL_IE | ADC_CTL_END | ADC_CTL_CH0);
/* ADC_CTL_IE causes an interrupt to be fired when this step is complete */
/* ADC_CTL_END causes this to be the last step to be taken */
ADCSequenceStepConfigure(ADC_BASE, id, 0, ADC_CTL_IE | ADC_CTL_END | adc_ctls[id]);
}
void platform_adc_burst( unsigned id, u16* buf, unsigned count, u32 frequency ) /* burst conversion: read "count" samples from the ADC channel "id", storing the results in "buf". The samples are read at periodic intervals, the period is given by "frequency". */