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https://github.com/RIOT-OS/RIOT.git
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kinetis: ADC: Add hardware averaging configuration
This allows a board configuration to select which kind of averaging should be applied to the pin instead of always using 32 sample average. Very high impedance sources may need to disable hardware averaging in order to give correct values, the on-chip temperature sensor is one such signal source.
This commit is contained in:
Joakim Nohlgård
parent
1e6009c582
commit
dd2fad6b9b
@ -127,14 +127,22 @@ static const uart_conf_t uart_config[] = {
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*/
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static const adc_conf_t adc_config[] = {
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/* dev, pin, channel */
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{ .dev = ADC0, .pin = GPIO_UNDEF , .chan = 0 }, /* ADC0_DP0 */
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{ .dev = ADC0, .pin = GPIO_UNDEF , .chan = 19 }, /* ADC0_DM0 */
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{ .dev = ADC1, .pin = GPIO_UNDEF , .chan = 0 }, /* ADC1_DP0 */
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{ .dev = ADC1, .pin = GPIO_UNDEF , .chan = 19 }, /* ADC1_DM0 */
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{ .dev = ADC0, .pin = GPIO_PIN(PORT_B, 0), .chan = 8 }, /* PTB0 (Arduino A0) */
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{ .dev = ADC0, .pin = GPIO_PIN(PORT_B, 1), .chan = 9 }, /* PTB1 (Arduino A1) */
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{ .dev = ADC0, .pin = GPIO_PIN(PORT_C, 1), .chan = 15 }, /* PTC1 (Arduino A2) */
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{ .dev = ADC0, .pin = GPIO_PIN(PORT_C, 2), .chan = 4 }, /* PTC2 (Arduino A3) */
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[ 0] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = 0, .avg = ADC_AVG_MAX }, /* ADC0_DP0 */
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[ 1] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = 19, .avg = ADC_AVG_MAX }, /* ADC0_DM0 */
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[ 2] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = 0, .avg = ADC_AVG_MAX }, /* ADC1_DP0 */
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[ 3] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = 19, .avg = ADC_AVG_MAX }, /* ADC1_DM0 */
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[ 4] = { .dev = ADC0, .pin = GPIO_PIN(PORT_B, 0), .chan = 8, .avg = ADC_AVG_MAX }, /* PTB0 (Arduino A0) */
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[ 5] = { .dev = ADC0, .pin = GPIO_PIN(PORT_B, 1), .chan = 9, .avg = ADC_AVG_MAX }, /* PTB1 (Arduino A1) */
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[ 6] = { .dev = ADC0, .pin = GPIO_PIN(PORT_C, 1), .chan = 15, .avg = ADC_AVG_MAX }, /* PTC1 (Arduino A2) */
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[ 7] = { .dev = ADC0, .pin = GPIO_PIN(PORT_C, 2), .chan = 4, .avg = ADC_AVG_MAX }, /* PTC2 (Arduino A3) */
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/* internal: temperature sensor */
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/* The temperature sensor has a very high output impedance, it must not be
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* sampled using hardware averaging, or the sampled values will be garbage */
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[ 8] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 26, .avg = ADC_AVG_NONE },
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/* internal: band gap */
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/* Note: the band gap buffer uses a bit of current and is turned off by default,
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* Set PMC->REGSC |= PMC_REGSC_BGBE_MASK before reading or the input will be floating */
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[ 9] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 27, .avg = ADC_AVG_MAX },
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};
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#define ADC_NUMOF (sizeof(adc_config) / sizeof(adc_config[0]))
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@ -120,32 +120,32 @@ static const uart_conf_t uart_config[] = {
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* @{
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*/
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static const adc_conf_t adc_config[] = {
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[ 0] = { .dev = ADC0, .pin = GPIO_PIN(PORT_B, 2), .chan = 12 }, /* PTB2 (Arduino A0) */
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[ 1] = { .dev = ADC0, .pin = GPIO_PIN(PORT_B, 3), .chan = 13 }, /* PTB3 (Arduino A1) */
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[ 2] = { .dev = ADC1, .pin = GPIO_PIN(PORT_B, 10), .chan = 14 }, /* PTB10 (Arduino A2) */
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[ 3] = { .dev = ADC1, .pin = GPIO_PIN(PORT_B, 11), .chan = 15 }, /* PTB11 (Arduino A3) */
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[ 4] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 11), .chan = 7 }, /* PTC11 (Arduino A4) */
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[ 5] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 10), .chan = 6 }, /* PTC10 (Arduino A5) */
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[ 6] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = 0 }, /* ADC0_DP0 */
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[ 7] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = 19 }, /* ADC0_DM0 */
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[ 8] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = (0 | ADC_SC1_DIFF_MASK) }, /* ADC0_DP0 - ADC0_DM0 */
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[ 9] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = 0 }, /* ADC1_DP0 */
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[10] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = 19 }, /* ADC1_DM0 */
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[11] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = (0 | ADC_SC1_DIFF_MASK) }, /* ADC1_DP0 - ADC1_DM0 */
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[12] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = 1 }, /* ADC0_DP1 */
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[13] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = 20 }, /* ADC0_DM1 */
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[14] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = (1 | ADC_SC1_DIFF_MASK) }, /* ADC0_DP1 - ADC0_DM1 */
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[15] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = 1 }, /* ADC1_DP1 */
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[16] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = 20 }, /* ADC1_DM1 */
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[17] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = (1 | ADC_SC1_DIFF_MASK) }, /* ADC1_DP1 - ADC1_DM1 */
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[ 0] = { .dev = ADC0, .pin = GPIO_PIN(PORT_B, 2), .chan = 12, .avg = ADC_AVG_MAX }, /* PTB2 (Arduino A0) */
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[ 1] = { .dev = ADC0, .pin = GPIO_PIN(PORT_B, 3), .chan = 13, .avg = ADC_AVG_MAX }, /* PTB3 (Arduino A1) */
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[ 2] = { .dev = ADC1, .pin = GPIO_PIN(PORT_B, 10), .chan = 14, .avg = ADC_AVG_MAX }, /* PTB10 (Arduino A2) */
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[ 3] = { .dev = ADC1, .pin = GPIO_PIN(PORT_B, 11), .chan = 15, .avg = ADC_AVG_MAX }, /* PTB11 (Arduino A3) */
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[ 4] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 11), .chan = 7, .avg = ADC_AVG_MAX }, /* PTC11 (Arduino A4) */
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[ 5] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 10), .chan = 6, .avg = ADC_AVG_MAX }, /* PTC10 (Arduino A5) */
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[ 6] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = 0, .avg = ADC_AVG_MAX }, /* ADC0_DP0 */
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[ 7] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = 19, .avg = ADC_AVG_MAX }, /* ADC0_DM0 */
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[ 8] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = (0 | ADC_SC1_DIFF_MASK), .avg = ADC_AVG_MAX }, /* ADC0_DP0 - ADC0_DM0 */
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[ 9] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = 0, .avg = ADC_AVG_MAX }, /* ADC1_DP0 */
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[10] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = 19, .avg = ADC_AVG_MAX }, /* ADC1_DM0 */
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[11] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = (0 | ADC_SC1_DIFF_MASK), .avg = ADC_AVG_MAX }, /* ADC1_DP0 - ADC1_DM0 */
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[12] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = 1, .avg = ADC_AVG_MAX }, /* ADC0_DP1 */
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[13] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = 20, .avg = ADC_AVG_MAX }, /* ADC0_DM1 */
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[14] = { .dev = ADC0, .pin = GPIO_UNDEF , .chan = (1 | ADC_SC1_DIFF_MASK), .avg = ADC_AVG_MAX }, /* ADC0_DP1 - ADC0_DM1 */
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[15] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = 1, .avg = ADC_AVG_MAX }, /* ADC1_DP1 */
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[16] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = 20, .avg = ADC_AVG_MAX }, /* ADC1_DM1 */
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[17] = { .dev = ADC1, .pin = GPIO_UNDEF , .chan = (1 | ADC_SC1_DIFF_MASK), .avg = ADC_AVG_MAX }, /* ADC1_DP1 - ADC1_DM1 */
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/* internal: temperature sensor */
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/* The temperature sensor has a very high output impedance, it must not be
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* sampled using hardware averaging, or the sampled values will be garbage */
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[18] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 26 },
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[18] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 26, .avg = ADC_AVG_NONE },
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/* internal: band gap */
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/* Note: the band gap buffer uses a bit of current and is turned off by default,
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* Set PMC->REGSC |= PMC_REGSC_BGBE_MASK before reading or the input will be floating */
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[19] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 27 },
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[19] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 27, .avg = ADC_AVG_MAX },
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};
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#define ADC_NUMOF (sizeof(adc_config) / sizeof(adc_config[0]))
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@ -129,21 +129,23 @@ static const uart_conf_t uart_config[] = {
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static const adc_conf_t adc_config[] = {
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/* dev, pin, channel */
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/* ADC0_DP-ADC0_DM differential reading (Arduino A5 - A0) */
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[ 0] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 0 | ADC_SC1_DIFF_MASK },
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[ 0] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 0 | ADC_SC1_DIFF_MASK, .avg = ADC_AVG_MAX },
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/* ADC0_DP single ended reading (Arduino A5) */
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[ 1] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 0 },
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[ 1] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 0, .avg = ADC_AVG_MAX },
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/* PTB2 (Arduino A2) */
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[ 2] = { .dev = ADC0, .pin = GPIO_PIN(PORT_B, 2), .chan = 3 },
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[ 2] = { .dev = ADC0, .pin = GPIO_PIN(PORT_B, 2), .chan = 3, .avg = ADC_AVG_MAX },
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/* PTB3 (Arduino A3) */
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[ 3] = { .dev = ADC0, .pin = GPIO_PIN(PORT_B, 3), .chan = 2 },
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[ 3] = { .dev = ADC0, .pin = GPIO_PIN(PORT_B, 3), .chan = 2, .avg = ADC_AVG_MAX },
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/* internal: temperature sensor */
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[ 4] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 26 },
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/* The temperature sensor has a very high output impedance, it must not be
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* sampled using hardware averaging, or the sampled values will be garbage */
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[ 4] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 26, .avg = ADC_AVG_NONE },
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/* Note: the band gap buffer uses a bit of current and is turned off by default,
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* Set PMC->REGSC |= PMC_REGSC_BGBE_MASK before reading or the input will be floating */
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/* internal: band gap */
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[ 5] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 27 },
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[ 5] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 27, .avg = ADC_AVG_MAX },
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/* internal: DCDC divided battery level */
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[ 6] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 23 },
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[ 6] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 23, .avg = ADC_AVG_MAX },
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};
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#define ADC_NUMOF (sizeof(adc_config) / sizeof(adc_config[0]))
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/*
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@ -165,39 +165,41 @@ static const uart_conf_t uart_config[] = {
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*/
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static const adc_conf_t adc_config[] = {
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/* internal: temperature sensor */
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[ 0] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 26 },
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/* The temperature sensor has a very high output impedance, it must not be
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* sampled using hardware averaging, or the sampled values will be garbage */
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[ 0] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 26, .avg = ADC_AVG_NONE },
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/* internal: band gap */
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[ 1] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 27 },
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[ 1] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 27, .avg = ADC_AVG_MAX },
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/* internal: V_REFSH */
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[ 2] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 29 },
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[ 2] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 29, .avg = ADC_AVG_MAX },
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/* internal: V_REFSL */
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[ 3] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 30 },
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[ 3] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 30, .avg = ADC_AVG_MAX },
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/* internal: DAC0 module output level */
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[ 4] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 23 },
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[ 4] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 23, .avg = ADC_AVG_MAX },
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/* internal: VREF module output level */
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[ 5] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 18 },
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/* on board connection to Mulle Vbat/2 on PGA1_DP pin */
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[ 6] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 0 },
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[ 5] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 18, .avg = ADC_AVG_MAX },
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/* on board connection to Mulle Vbat/2 on PGA1_DP pin */
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[ 6] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 0, .avg = ADC_AVG_MAX },
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/* on board connection to Mulle Vchr/2 on PGA1_DM pin */
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[ 7] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 19 },
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[ 7] = { .dev = ADC1, .pin = GPIO_UNDEF, .chan = 19, .avg = ADC_AVG_MAX },
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/* expansion port PGA0_DP pin */
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[ 8] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 0 },
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[ 8] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 0, .avg = ADC_AVG_MAX },
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/* expansion port PGA0_DM pin */
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[ 9] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 19 },
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[ 9] = { .dev = ADC0, .pin = GPIO_UNDEF, .chan = 19, .avg = ADC_AVG_MAX },
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/* expansion port PTA17 */
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[10] = { .dev = ADC1, .pin = GPIO_PIN(PORT_A, 17), .chan = 17 },
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[10] = { .dev = ADC1, .pin = GPIO_PIN(PORT_A, 17), .chan = 17, .avg = ADC_AVG_MAX },
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/* expansion port PTB0 */
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[11] = { .dev = ADC1, .pin = GPIO_PIN(PORT_B, 0), .chan = 8 },
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[11] = { .dev = ADC1, .pin = GPIO_PIN(PORT_B, 0), .chan = 8, .avg = ADC_AVG_MAX },
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/* expansion port PTC0 */
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[12] = { .dev = ADC0, .pin = GPIO_PIN(PORT_C, 0), .chan = 14 },
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[12] = { .dev = ADC0, .pin = GPIO_PIN(PORT_C, 0), .chan = 14, .avg = ADC_AVG_MAX },
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/* expansion port PTC8 */
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[13] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 8), .chan = 4 },
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[13] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 8), .chan = 4, .avg = ADC_AVG_MAX },
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/* expansion port PTC9 */
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[14] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 9), .chan = 5 },
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[14] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 9), .chan = 5, .avg = ADC_AVG_MAX },
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/* expansion port PTC10 */
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[15] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 10), .chan = 6 },
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[15] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 10), .chan = 6, .avg = ADC_AVG_MAX },
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/* expansion port PTC11 */
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[16] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 11), .chan = 7 }
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[16] = { .dev = ADC1, .pin = GPIO_PIN(PORT_C, 11), .chan = 7, .avg = ADC_AVG_MAX },
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};
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#define ADC_NUMOF (sizeof(adc_config) / sizeof(adc_config[0]))
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@ -135,12 +135,12 @@ static const uart_conf_t uart_config[] = {
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* @{
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*/
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static const adc_conf_t adc_config[] = {
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{ .dev = ADC0, .pin = GPIO_PIN(PORT_E, 2), .chan = 1 },
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{ .dev = ADC0, .pin = GPIO_PIN(PORT_E, 3), .chan = 1 },
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{ .dev = ADC0, .pin = GPIO_PIN(PORT_D, 7), .chan = 22 },
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{ .dev = ADC0, .pin = GPIO_PIN(PORT_D, 5), .chan = 6 },
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{ .dev = ADC0, .pin = GPIO_PIN(PORT_E, 0), .chan = 10 },
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{ .dev = ADC0, .pin = GPIO_PIN(PORT_E, 1), .chan = 11 }
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[ 0] = { .dev = ADC0, .pin = GPIO_PIN(PORT_E, 2), .chan = 1, .avg = ADC_AVG_MAX },
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[ 1] = { .dev = ADC0, .pin = GPIO_PIN(PORT_E, 3), .chan = 1, .avg = ADC_AVG_MAX },
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[ 2] = { .dev = ADC0, .pin = GPIO_PIN(PORT_D, 7), .chan = 22, .avg = ADC_AVG_MAX },
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[ 3] = { .dev = ADC0, .pin = GPIO_PIN(PORT_D, 5), .chan = 6, .avg = ADC_AVG_MAX },
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[ 4] = { .dev = ADC0, .pin = GPIO_PIN(PORT_E, 0), .chan = 10, .avg = ADC_AVG_MAX },
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[ 5] = { .dev = ADC0, .pin = GPIO_PIN(PORT_E, 1), .chan = 11, .avg = ADC_AVG_MAX }
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};
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#define ADC_NUMOF (sizeof(adc_config) / sizeof(adc_config[0]))
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@ -274,12 +274,40 @@ typedef enum {
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* @brief CPU specific ADC configuration
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*/
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typedef struct {
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ADC_Type *dev; /**< ADC device */
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gpio_t pin; /**< pin to use, set to GPIO_UNDEF for internal
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* channels */
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uint8_t chan; /**< ADC channel */
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/**
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* @brief ADC module
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*/
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ADC_Type *dev;
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/**
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* @brief pin to use
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*
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* Use GPIO_UNDEF non-muxed ADC pins, e.g. ADC0_DP, or for internal channels, e.g. Bandgap
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*/
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gpio_t pin;
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/**
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* @brief ADC channel
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*
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* Written as-is to ADCx_SC1x before conversion. This also decides
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* single-ended or differential sampling, see CPU reference manual for ADCx_SC1x
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*/
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uint8_t chan;
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/**
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* @brief Hardware averaging configuration
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*
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* Written as-is to ADCx_SC3 before conversion, use @ref ADC_AVG_NONE and
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* @ref ADC_AVG_MAX as a shorthand notation in the board configuration */
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uint8_t avg;
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} adc_conf_t;
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/**
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* @brief Disable hardware averaging
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*/
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#define ADC_AVG_NONE (0)
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/**
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* @brief Maximum hardware averaging (32 samples)
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*/
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#define ADC_AVG_MAX (ADC_SC3_AVGE_MASK | ADC_SC3_AVGS(3))
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#if defined(DAC0_BASE) && (DAC0_BASE != This_symbol_has_been_deprecated)
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/**
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* @brief CPU specific DAC configuration
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@ -197,10 +197,9 @@ int adc_init(adc_t line)
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dev(line)->CFG2 = ADC_CFG2_MUXSEL_MASK | ADC_CFG2_ADLSTS(0);
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/* select software trigger, external ref pins */
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dev(line)->SC2 = ADC_SC2_REFSEL(ADC_REF_SETTING);
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/* select hardware average over 32 samples */
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dev(line)->SC3 = ADC_SC3_AVGE_MASK | ADC_SC3_AVGS(3);
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/* set an (arbitrary) input channel, single-ended mode */
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dev(line)->SC1[0] = ADC_SC1_ADCH(0);
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/* set an arbitrary input channel configuration */
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dev(line)->SC3 = 0;
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dev(line)->SC1[0] = ADC_SC1_ADCH(31);
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/* perform calibration routine */
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int res = kinetis_adc_calibrate(dev(line));
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@ -223,6 +222,8 @@ int adc_sample(adc_t line, adc_res_t res)
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/* set resolution */
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dev(line)->CFG1 &= ~(ADC_CFG1_MODE_MASK);
|
||||
dev(line)->CFG1 |= (res);
|
||||
/* set the chosen hardware averaging setting for this channel */
|
||||
dev(line)->SC3 = adc_config[line].avg;
|
||||
/* select the channel that is sampled */
|
||||
dev(line)->SC1[0] = adc_config[line].chan;
|
||||
/* wait until conversion is complete */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user