mbed library with additional peripherals for ST F401 board
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This mbed LIB has additional peripherals for ST F401 board
- UART2 : PA_3 rx, PA_2 tx
- UART3 : PC_7 rx, PC_6 tx
- I2C2 : PB_3 SDA, PB_10 SCL
- I2C3 : PB_4 SDA, PA_8 SCL
targets/hal/TARGET_Freescale/TARGET_KL25Z/pwmout_api.c
- Committer:
- mbed_official
- Date:
- 2014-01-13
- Revision:
- 72:248c61396e08
- Parent:
- 20:4263a77256ae
- Child:
- 74:847f030b50ee
File content as of revision 72:248c61396e08:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "pwmout_api.h" #include "cmsis.h" #include "pinmap.h" #include "error.h" static const PinMap PinMap_PWM[] = { // LEDs {LED_RED , PWM_9 , 3}, // PTB18, TPM2 CH0 {LED_GREEN, PWM_10, 3}, // PTB19, TPM2 CH1 {LED_BLUE , PWM_2 , 4}, // PTD1 , TPM0 CH1 // Arduino digital pinout {D0, PWM_9 , 3}, // PTA1 , TPM2 CH0 {D1, PWM_10, 3}, // PTA2 , TPM2 CH1 {D2, PWM_5 , 4}, // PTD4 , TPM0 CH4 {D3, PWM_7 , 3}, // PTA12, TPM1 CH0 {D4, PWM_2 , 3}, // PTA4 , TPM0 CH1 {D5, PWM_3 , 3}, // PTA5 , TPM0 CH2 {D6, PWM_5 , 3}, // PTC8 , TPM0 CH4 {D7, PWM_6 , 3}, // PTC9 , TPM0 CH5 {D8, PWM_8 , 3}, // PTA13, TPM1 CH1 {D9, PWM_6 , 4}, // PTD5 , TPM0 CH5 {D10, PWM_1 , 4}, // PTD0 , TPM0 CH0 {D11, PWM_3 , 4}, // PTD2 , TPM0 CH2 {D12, PWM_4 , 4}, // PTD3 , TPM0 CH3 {D13, PWM_2 , 4}, // PTD1 , TPM0 CH1, {PTA0, PWM_6, 3}, {PTA3, PWM_1, 3}, {PTB0, PWM_7, 3}, {PTB1, PWM_8, 3}, {PTB2, PWM_9, 3}, {PTB3, PWM_10, 3}, {PTC1, PWM_1, 4}, {PTC2, PWM_2, 4}, {PTC3, PWM_3, 4}, {PTC4, PWM_4, 4}, {PTE20, PWM_7, 3}, {PTE21, PWM_8, 3}, {PTE22, PWM_9, 3}, {PTE23, PWM_10, 3}, {PTE24, PWM_1, 3}, {PTE25, PWM_2, 3}, {PTE29, PWM_3, 3}, {PTE30, PWM_4, 3}, {PTE31, PWM_5, 3}, {NC , NC , 0} }; static float pwm_clock; void pwmout_init(pwmout_t* obj, PinName pin) { // determine the channel PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM); if (pwm == (PWMName)NC) error("PwmOut pin mapping failed"); uint32_t clkdiv = 0; float clkval = SystemCoreClock / 1000000.0f; while (clkval > 1) { clkdiv++; clkval /= 2.0; if (clkdiv == 7) break; } pwm_clock = clkval; unsigned int port = (unsigned int)pin >> PORT_SHIFT; unsigned int tpm_n = (pwm >> TPM_SHIFT); unsigned int ch_n = (pwm & 0xFF); SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port); SIM->SCGC6 |= 1 << (SIM_SCGC6_TPM0_SHIFT + tpm_n); SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1); // Clock source: MCGFLLCLK or MCGPLLCLK TPM_Type *tpm = (TPM_Type *)(TPM0_BASE + 0x1000 * tpm_n); tpm->SC = TPM_SC_CMOD(1) | TPM_SC_PS(clkdiv); // (clock)MHz / clkdiv ~= (0.75)MHz tpm->CONTROLS[ch_n].CnSC = (TPM_CnSC_MSB_MASK | TPM_CnSC_ELSB_MASK); /* No Interrupts; High True pulses on Edge Aligned PWM */ obj->CnV = &tpm->CONTROLS[ch_n].CnV; obj->MOD = &tpm->MOD; obj->CNT = &tpm->CNT; // default to 20ms: standard for servos, and fine for e.g. brightness control pwmout_period_ms(obj, 20); pwmout_write (obj, 0); // Wire pinout pinmap_pinout(pin, PinMap_PWM); } void pwmout_free(pwmout_t* obj) {} void pwmout_write(pwmout_t* obj, float value) { if (value < 0.0) { value = 0.0; } else if (value > 1.0) { value = 1.0; } *obj->CnV = (uint32_t)((float)(*obj->MOD) * value); *obj->CNT = 0; } float pwmout_read(pwmout_t* obj) { float v = (float)(*obj->CnV) / (float)(*obj->MOD); return (v > 1.0) ? (1.0) : (v); } void pwmout_period(pwmout_t* obj, float seconds) { pwmout_period_us(obj, seconds * 1000000.0f); } void pwmout_period_ms(pwmout_t* obj, int ms) { pwmout_period_us(obj, ms * 1000); } // Set the PWM period, keeping the duty cycle the same. void pwmout_period_us(pwmout_t* obj, int us) { float dc = pwmout_read(obj); *obj->MOD = (uint32_t)(pwm_clock * (float)us); pwmout_write(obj, dc); } void pwmout_pulsewidth(pwmout_t* obj, float seconds) { pwmout_pulsewidth_us(obj, seconds * 1000000.0f); } void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) { pwmout_pulsewidth_us(obj, ms * 1000); } void pwmout_pulsewidth_us(pwmout_t* obj, int us) { *obj->CnV = (uint32_t)(pwm_clock * (float)us); }